G1BarrierSet_merge

0 /*                                                                                                                                   
1  * Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.                                                      
2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.                                                                     
3  *                                                                                                                                   
4  * This code is free software; you can redistribute it and/or modify it                                                              
5  * under the terms of the GNU General Public License version 2 only, as                                                              
6  * published by the Free Software Foundation.                                                                                        
7  *                                                                                                                                   
8  * This code is distributed in the hope that it will be useful, but WITHOUT                                                          
9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or                                                             
10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License                                                             
11  * version 2 for more details (a copy is included in the LICENSE file that                                                           
12  * accompanied this code).                                                                                                           
13  *                                                                                                                                   
14  * You should have received a copy of the GNU General Public License version                                                         
15  * 2 along with this work; if not, write to the Free Software Foundation,                                                            
16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.                                                                     
17  *                                                                                                                                   
18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA                                                           
19  * or visit www.oracle.com if you need additional information or have any                                                            
20  * questions.                                                                                                                        
21  *                                                                                                                                   
22  */                                                                                                                                  
23 
24 #include "precompiled.hpp"                                                                                                           
25 #include "c1/c1_Compilation.hpp"                                                                                                     
26 #include "c1/c1_Defs.hpp"                                                                                                            
27 #include "c1/c1_FrameMap.hpp"                                                                                                        
28 #include "c1/c1_Instruction.hpp"                                                                                                     
29 #include "c1/c1_LIRAssembler.hpp"                                                                                                    
30 #include "c1/c1_LIRGenerator.hpp"                                                                                                    
31 #include "c1/c1_ValueStack.hpp"                                                                                                      
32 #include "ci/ciArrayKlass.hpp"                                                                                                       
33 #include "ci/ciInstance.hpp"                                                                                                         
34 #include "ci/ciObjArray.hpp"                                                                                                         
35 #include "ci/ciUtilities.hpp"                                                                                                        
36 #include "gc/shared/cardTable.hpp"                                                                                                   
37 #include "gc/shared/cardTableModRefBS.hpp"                                                                                           
38 #include "runtime/arguments.hpp"                                                                                                     
39 #include "runtime/sharedRuntime.hpp"                                                                                                 
40 #include "runtime/stubRoutines.hpp"                                                                                                  
41 #include "runtime/vm_version.hpp"                                                                                                    
42 #include "utilities/bitMap.inline.hpp"                                                                                               
43 #include "utilities/macros.hpp"                                                                                                      
44 #if INCLUDE_ALL_GCS                                                                                                                  
45 #include "gc/g1/heapRegion.hpp"                                                                                                      
46 #endif // INCLUDE_ALL_GCS                                                                                                            
47 #ifdef TRACE_HAVE_INTRINSICS                                                                                                         
48 #include "trace/traceMacros.hpp"                                                                                                     
49 #endif                                                                                                                               
50 
51 #ifdef ASSERT                                                                                                                        
52 #define __ gen()->lir(__FILE__, __LINE__)->                                                                                          
53 #else                                                                                                                                
54 #define __ gen()->lir()->                                                                                                            
55 #endif                                                                                                                               
56 
57 #ifndef PATCHED_ADDR                                                                                                                 
58 #define PATCHED_ADDR  (max_jint)                                                                                                     
59 #endif                                                                                                                               
60 
61 void PhiResolverState::reset(int max_vregs) {                                                                                        
62   // Initialize array sizes                                                                                                          
63   _virtual_operands.at_put_grow(max_vregs - 1, NULL, NULL);                                                                          
64   _virtual_operands.trunc_to(0);                                                                                                     
65   _other_operands.at_put_grow(max_vregs - 1, NULL, NULL);                                                                            
66   _other_operands.trunc_to(0);                                                                                                       
67   _vreg_table.at_put_grow(max_vregs - 1, NULL, NULL);                                                                                
68   _vreg_table.trunc_to(0);                                                                                                           
69 }                                                                                                                                    
70 
71 
72 
73 //--------------------------------------------------------------                                                                     
74 // PhiResolver                                                                                                                       
75 
76 // Resolves cycles:                                                                                                                  
77 //                                                                                                                                   
78 //  r1 := r2  becomes  temp := r1                                                                                                    
79 //  r2 := r1           r1 := r2                                                                                                      
80 //                     r2 := temp                                                                                                    
81 // and orders moves:                                                                                                                 
82 //                                                                                                                                   
83 //  r2 := r3  becomes  r1 := r2                                                                                                      
84 //  r1 := r2           r2 := r3                                                                                                      
85 
86 PhiResolver::PhiResolver(LIRGenerator* gen, int max_vregs)                                                                           
87  : _gen(gen)                                                                                                                         
88  , _state(gen->resolver_state())                                                                                                     
89  , _temp(LIR_OprFact::illegalOpr)                                                                                                    
90 {                                                                                                                                    
91   // reinitialize the shared state arrays                                                                                            
92   _state.reset(max_vregs);                                                                                                           
93 }                                                                                                                                    
94 
95 
96 void PhiResolver::emit_move(LIR_Opr src, LIR_Opr dest) {                                                                             
97   assert(src->is_valid(), "");                                                                                                       
98   assert(dest->is_valid(), "");                                                                                                      
99   __ move(src, dest);                                                                                                                
100 }                                                                                                                                    
101 
102 
103 void PhiResolver::move_temp_to(LIR_Opr dest) {                                                                                       
104   assert(_temp->is_valid(), "");                                                                                                     
105   emit_move(_temp, dest);                                                                                                            
106   NOT_PRODUCT(_temp = LIR_OprFact::illegalOpr);                                                                                      
107 }                                                                                                                                    
108 
109 
110 void PhiResolver::move_to_temp(LIR_Opr src) {                                                                                        
111   assert(_temp->is_illegal(), "");                                                                                                   
112   _temp = _gen->new_register(src->type());                                                                                           
113   emit_move(src, _temp);                                                                                                             
114 }                                                                                                                                    
115 
116 
117 // Traverse assignment graph in depth first order and generate moves in post order                                                   
118 // ie. two assignments: b := c, a := b start with node c:                                                                            
119 // Call graph: move(NULL, c) -> move(c, b) -> move(b, a)                                                                             
120 // Generates moves in this order: move b to a and move c to b                                                                        
121 // ie. cycle a := b, b := a start with node a                                                                                        
122 // Call graph: move(NULL, a) -> move(a, b) -> move(b, a)                                                                             
123 // Generates moves in this order: move b to temp, move a to b, move temp to a                                                        
124 void PhiResolver::move(ResolveNode* src, ResolveNode* dest) {                                                                        
125   if (!dest->visited()) {                                                                                                            
126     dest->set_visited();                                                                                                             
127     for (int i = dest->no_of_destinations()-1; i >= 0; i --) {                                                                       
128       move(dest, dest->destination_at(i));                                                                                           
129     }                                                                                                                                
130   } else if (!dest->start_node()) {                                                                                                  
131     // cylce in graph detected                                                                                                       
132     assert(_loop == NULL, "only one loop valid!");                                                                                   
133     _loop = dest;                                                                                                                    
134     move_to_temp(src->operand());                                                                                                    
135     return;                                                                                                                          
136   } // else dest is a start node                                                                                                     
137 
138   if (!dest->assigned()) {                                                                                                           
139     if (_loop == dest) {                                                                                                             
140       move_temp_to(dest->operand());                                                                                                 
141       dest->set_assigned();                                                                                                          
142     } else if (src != NULL) {                                                                                                        
143       emit_move(src->operand(), dest->operand());                                                                                    
144       dest->set_assigned();                                                                                                          
145     }                                                                                                                                
146   }                                                                                                                                  
147 }                                                                                                                                    
148 
149 
150 PhiResolver::~PhiResolver() {                                                                                                        
151   int i;                                                                                                                             
152   // resolve any cycles in moves from and to virtual registers                                                                       
153   for (i = virtual_operands().length() - 1; i >= 0; i --) {                                                                          
154     ResolveNode* node = virtual_operands().at(i);                                                                                    
155     if (!node->visited()) {                                                                                                          
156       _loop = NULL;                                                                                                                  
157       move(NULL, node);                                                                                                              
158       node->set_start_node();                                                                                                        
159       assert(_temp->is_illegal(), "move_temp_to() call missing");                                                                    
160     }                                                                                                                                
161   }                                                                                                                                  
162 
163   // generate move for move from non virtual register to abitrary destination                                                        
164   for (i = other_operands().length() - 1; i >= 0; i --) {                                                                            
165     ResolveNode* node = other_operands().at(i);                                                                                      
166     for (int j = node->no_of_destinations() - 1; j >= 0; j --) {                                                                     
167       emit_move(node->operand(), node->destination_at(j)->operand());                                                                
168     }                                                                                                                                
169   }                                                                                                                                  
170 }                                                                                                                                    
171 
172 
173 ResolveNode* PhiResolver::create_node(LIR_Opr opr, bool source) {                                                                    
174   ResolveNode* node;                                                                                                                 
175   if (opr->is_virtual()) {                                                                                                           
176     int vreg_num = opr->vreg_number();                                                                                               
177     node = vreg_table().at_grow(vreg_num, NULL);                                                                                     
178     assert(node == NULL || node->operand() == opr, "");                                                                              
179     if (node == NULL) {                                                                                                              
180       node = new ResolveNode(opr);                                                                                                   
181       vreg_table().at_put(vreg_num, node);                                                                                           
182     }                                                                                                                                
183     // Make sure that all virtual operands show up in the list when                                                                  
184     // they are used as the source of a move.                                                                                        
185     if (source && !virtual_operands().contains(node)) {                                                                              
186       virtual_operands().append(node);                                                                                               
187     }                                                                                                                                
188   } else {                                                                                                                           
189     assert(source, "");                                                                                                              
190     node = new ResolveNode(opr);                                                                                                     
191     other_operands().append(node);                                                                                                   
192   }                                                                                                                                  
193   return node;                                                                                                                       
194 }                                                                                                                                    
195 
196 
197 void PhiResolver::move(LIR_Opr src, LIR_Opr dest) {                                                                                  
198   assert(dest->is_virtual(), "");                                                                                                    
199   // tty->print("move "); src->print(); tty->print(" to "); dest->print(); tty->cr();                                                
200   assert(src->is_valid(), "");                                                                                                       
201   assert(dest->is_valid(), "");                                                                                                      
202   ResolveNode* source = source_node(src);                                                                                            
203   source->append(destination_node(dest));                                                                                            
204 }                                                                                                                                    
205 
206 
207 //--------------------------------------------------------------                                                                     
208 // LIRItem                                                                                                                           
209 
210 void LIRItem::set_result(LIR_Opr opr) {                                                                                              
211   assert(value()->operand()->is_illegal() || value()->operand()->is_constant(), "operand should never change");                      
212   value()->set_operand(opr);                                                                                                         
213 
214   if (opr->is_virtual()) {                                                                                                           
215     _gen->_instruction_for_operand.at_put_grow(opr->vreg_number(), value(), NULL);                                                   
216   }                                                                                                                                  
217 
218   _result = opr;                                                                                                                     
219 }                                                                                                                                    
220 
221 void LIRItem::load_item() {                                                                                                          
222   if (result()->is_illegal()) {                                                                                                      
223     // update the items result                                                                                                       
224     _result = value()->operand();                                                                                                    
225   }                                                                                                                                  
226   if (!result()->is_register()) {                                                                                                    
227     LIR_Opr reg = _gen->new_register(value()->type());                                                                               
228     __ move(result(), reg);                                                                                                          
229     if (result()->is_constant()) {                                                                                                   
230       _result = reg;                                                                                                                 
231     } else {                                                                                                                         
232       set_result(reg);                                                                                                               
233     }                                                                                                                                
234   }                                                                                                                                  
235 }                                                                                                                                    
236 
237 
238 void LIRItem::load_for_store(BasicType type) {                                                                                       
239   if (_gen->can_store_as_constant(value(), type)) {                                                                                  
240     _result = value()->operand();                                                                                                    
241     if (!_result->is_constant()) {                                                                                                   
242       _result = LIR_OprFact::value_type(value()->type());                                                                            
243     }                                                                                                                                
244   } else if (type == T_BYTE || type == T_BOOLEAN) {                                                                                  
245     load_byte_item();                                                                                                                
246   } else {                                                                                                                           
247     load_item();                                                                                                                     
248   }                                                                                                                                  
249 }                                                                                                                                    
250 
251 void LIRItem::load_item_force(LIR_Opr reg) {                                                                                         
252   LIR_Opr r = result();                                                                                                              
253   if (r != reg) {                                                                                                                    
254 #if !defined(ARM) && !defined(E500V2)                                                                                                
255     if (r->type() != reg->type()) {                                                                                                  
256       // moves between different types need an intervening spill slot                                                                
257       r = _gen->force_to_spill(r, reg->type());                                                                                      
258     }                                                                                                                                
259 #endif                                                                                                                               
260     __ move(r, reg);                                                                                                                 
261     _result = reg;                                                                                                                   
262   }                                                                                                                                  
263 }                                                                                                                                    
264 
265 ciObject* LIRItem::get_jobject_constant() const {                                                                                    
266   ObjectType* oc = type()->as_ObjectType();                                                                                          
267   if (oc) {                                                                                                                          
268     return oc->constant_value();                                                                                                     
269   }                                                                                                                                  
270   return NULL;                                                                                                                       
271 }                                                                                                                                    
272 
273 
274 jint LIRItem::get_jint_constant() const {                                                                                            
275   assert(is_constant() && value() != NULL, "");                                                                                      
276   assert(type()->as_IntConstant() != NULL, "type check");                                                                            
277   return type()->as_IntConstant()->value();                                                                                          
278 }                                                                                                                                    
279 
280 
281 jint LIRItem::get_address_constant() const {                                                                                         
282   assert(is_constant() && value() != NULL, "");                                                                                      
283   assert(type()->as_AddressConstant() != NULL, "type check");                                                                        
284   return type()->as_AddressConstant()->value();                                                                                      
285 }                                                                                                                                    
286 
287 
288 jfloat LIRItem::get_jfloat_constant() const {                                                                                        
289   assert(is_constant() && value() != NULL, "");                                                                                      
290   assert(type()->as_FloatConstant() != NULL, "type check");                                                                          
291   return type()->as_FloatConstant()->value();                                                                                        
292 }                                                                                                                                    
293 
294 
295 jdouble LIRItem::get_jdouble_constant() const {                                                                                      
296   assert(is_constant() && value() != NULL, "");                                                                                      
297   assert(type()->as_DoubleConstant() != NULL, "type check");                                                                         
298   return type()->as_DoubleConstant()->value();                                                                                       
299 }                                                                                                                                    
300 
301 
302 jlong LIRItem::get_jlong_constant() const {                                                                                          
303   assert(is_constant() && value() != NULL, "");                                                                                      
304   assert(type()->as_LongConstant() != NULL, "type check");                                                                           
305   return type()->as_LongConstant()->value();                                                                                         
306 }                                                                                                                                    
307 
308 
309 
310 //--------------------------------------------------------------                                                                     
311 
312 
313 void LIRGenerator::init() {                                                                                                          
314   _bs = Universe::heap()->barrier_set();                                                                                             
315 }                                                                                                                                    
316 
317 
318 void LIRGenerator::block_do_prolog(BlockBegin* block) {                                                                              
319 #ifndef PRODUCT                                                                                                                      
320   if (PrintIRWithLIR) {                                                                                                              
321     block->print();                                                                                                                  
322   }                                                                                                                                  
323 #endif                                                                                                                               
324 
325   // set up the list of LIR instructions                                                                                             
326   assert(block->lir() == NULL, "LIR list already computed for this block");                                                          
327   _lir = new LIR_List(compilation(), block);                                                                                         
328   block->set_lir(_lir);                                                                                                              
329 
330   __ branch_destination(block->label());                                                                                             
331 
332   if (LIRTraceExecution &&                                                                                                           
333       Compilation::current()->hir()->start()->block_id() != block->block_id() &&                                                     
334       !block->is_set(BlockBegin::exception_entry_flag)) {                                                                            
335     assert(block->lir()->instructions_list()->length() == 1, "should come right after br_dst");                                      
336     trace_block_entry(block);                                                                                                        
337   }                                                                                                                                  
338 }                                                                                                                                    
339 
340 
341 void LIRGenerator::block_do_epilog(BlockBegin* block) {                                                                              
342 #ifndef PRODUCT                                                                                                                      
343   if (PrintIRWithLIR) {                                                                                                              
344     tty->cr();                                                                                                                       
345   }                                                                                                                                  
346 #endif                                                                                                                               
347 
348   // LIR_Opr for unpinned constants shouldn't be referenced by other                                                                 
349   // blocks so clear them out after processing the block.                                                                            
350   for (int i = 0; i < _unpinned_constants.length(); i++) {                                                                           
351     _unpinned_constants.at(i)->clear_operand();                                                                                      
352   }                                                                                                                                  
353   _unpinned_constants.trunc_to(0);                                                                                                   
354 
355   // clear our any registers for other local constants                                                                               
356   _constants.trunc_to(0);                                                                                                            
357   _reg_for_constants.trunc_to(0);                                                                                                    
358 }                                                                                                                                    
359 
360 
361 void LIRGenerator::block_do(BlockBegin* block) {                                                                                     
362   CHECK_BAILOUT();                                                                                                                   
363 
364   block_do_prolog(block);                                                                                                            
365   set_block(block);                                                                                                                  
366 
367   for (Instruction* instr = block; instr != NULL; instr = instr->next()) {                                                           
368     if (instr->is_pinned()) do_root(instr);                                                                                          
369   }                                                                                                                                  
370 
371   set_block(NULL);                                                                                                                   
372   block_do_epilog(block);                                                                                                            
373 }                                                                                                                                    
374 
375 
376 //-------------------------LIRGenerator-----------------------------                                                                 
377 
378 // This is where the tree-walk starts; instr must be root;                                                                           
379 void LIRGenerator::do_root(Value instr) {                                                                                            
380   CHECK_BAILOUT();                                                                                                                   
381 
382   InstructionMark im(compilation(), instr);                                                                                          
383 
384   assert(instr->is_pinned(), "use only with roots");                                                                                 
385   assert(instr->subst() == instr, "shouldn't have missed substitution");                                                             
386 
387   instr->visit(this);                                                                                                                
388 
389   assert(!instr->has_uses() || instr->operand()->is_valid() ||                                                                       
390          instr->as_Constant() != NULL || bailed_out(), "invalid item set");                                                          
391 }                                                                                                                                    
392 
393 
394 // This is called for each node in tree; the walk stops if a root is reached                                                         
395 void LIRGenerator::walk(Value instr) {                                                                                               
396   InstructionMark im(compilation(), instr);                                                                                          
397   //stop walk when encounter a root                                                                                                  
398   if ((instr->is_pinned() && instr->as_Phi() == NULL) || instr->operand()->is_valid()) {                                             
399     assert(instr->operand() != LIR_OprFact::illegalOpr || instr->as_Constant() != NULL, "this root has not yet been visited");       
400   } else {                                                                                                                           
401     assert(instr->subst() == instr, "shouldn't have missed substitution");                                                           
402     instr->visit(this);                                                                                                              
403     // assert(instr->use_count() > 0 || instr->as_Phi() != NULL, "leaf instruction must have a use");                                
404   }                                                                                                                                  
405 }                                                                                                                                    
406 
407 
408 CodeEmitInfo* LIRGenerator::state_for(Instruction* x, ValueStack* state, bool ignore_xhandler) {                                     
409   assert(state != NULL, "state must be defined");                                                                                    
410 
411 #ifndef PRODUCT                                                                                                                      
412   state->verify();                                                                                                                   
413 #endif                                                                                                                               
414 
415   ValueStack* s = state;                                                                                                             
416   for_each_state(s) {                                                                                                                
417     if (s->kind() == ValueStack::EmptyExceptionState) {                                                                              
418       assert(s->stack_size() == 0 && s->locals_size() == 0 && (s->locks_size() == 0 || s->locks_size() == 1), "state must be empty");
419       continue;                                                                                                                      
420     }                                                                                                                                
421 
422     int index;                                                                                                                       
423     Value value;                                                                                                                     
424     for_each_stack_value(s, index, value) {                                                                                          
425       assert(value->subst() == value, "missed substitution");                                                                        
426       if (!value->is_pinned() && value->as_Constant() == NULL && value->as_Local() == NULL) {                                        
427         walk(value);                                                                                                                 
428         assert(value->operand()->is_valid(), "must be evaluated now");                                                               
429       }                                                                                                                              
430     }                                                                                                                                
431 
432     int bci = s->bci();                                                                                                              
433     IRScope* scope = s->scope();                                                                                                     
434     ciMethod* method = scope->method();                                                                                              
435 
436     MethodLivenessResult liveness = method->liveness_at_bci(bci);                                                                    
437     if (bci == SynchronizationEntryBCI) {                                                                                            
438       if (x->as_ExceptionObject() || x->as_Throw()) {                                                                                
439         // all locals are dead on exit from the synthetic unlocker                                                                   
440         liveness.clear();                                                                                                            
441       } else {                                                                                                                       
442         assert(x->as_MonitorEnter() || x->as_ProfileInvoke(), "only other cases are MonitorEnter and ProfileInvoke");                
443       }                                                                                                                              
444     }                                                                                                                                
445     if (!liveness.is_valid()) {                                                                                                      
446       // Degenerate or breakpointed method.                                                                                          
447       bailout("Degenerate or breakpointed method");                                                                                  
448     } else {                                                                                                                         
449       assert((int)liveness.size() == s->locals_size(), "error in use of liveness");                                                  
450       for_each_local_value(s, index, value) {                                                                                        
451         assert(value->subst() == value, "missed substition");                                                                        
452         if (liveness.at(index) && !value->type()->is_illegal()) {                                                                    
453           if (!value->is_pinned() && value->as_Constant() == NULL && value->as_Local() == NULL) {                                    
454             walk(value);                                                                                                             
455             assert(value->operand()->is_valid(), "must be evaluated now");                                                           
456           }                                                                                                                          
457         } else {                                                                                                                     
458           // NULL out this local so that linear scan can assume that all non-NULL values are live.                                   
459           s->invalidate_local(index);                                                                                                
460         }                                                                                                                            
461       }                                                                                                                              
462     }                                                                                                                                
463   }                                                                                                                                  
464 
465   return new CodeEmitInfo(state, ignore_xhandler ? NULL : x->exception_handlers(), x->check_flag(Instruction::DeoptimizeOnException))
466 }                                                                                                                                    
467 
468 
469 CodeEmitInfo* LIRGenerator::state_for(Instruction* x) {                                                                              
470   return state_for(x, x->exception_state());                                                                                         
471 }                                                                                                                                    
472 
473 
474 void LIRGenerator::klass2reg_with_patching(LIR_Opr r, ciMetadata* obj, CodeEmitInfo* info, bool need_resolve) {                      
475   /* C2 relies on constant pool entries being resolved (ciTypeFlow), so if TieredCompilation                                         
476    * is active and the class hasn't yet been resolved we need to emit a patch that resolves                                          
477    * the class. */                                                                                                                   
478   if ((TieredCompilation && need_resolve) || !obj->is_loaded() || PatchALot) {                                                       
479     assert(info != NULL, "info must be set if class is not loaded");                                                                 
480     __ klass2reg_patch(NULL, r, info);                                                                                               
481   } else {                                                                                                                           
482     // no patching needed                                                                                                            
483     __ metadata2reg(obj->constant_encoding(), r);                                                                                    
484   }                                                                                                                                  
485 }                                                                                                                                    
486 
487 
488 void LIRGenerator::array_range_check(LIR_Opr array, LIR_Opr index,                                                                   
489                                     CodeEmitInfo* null_check_info, CodeEmitInfo* range_check_info) {                                 
490   CodeStub* stub = new RangeCheckStub(range_check_info, index);                                                                      
491   if (index->is_constant()) {                                                                                                        
492     cmp_mem_int(lir_cond_belowEqual, array, arrayOopDesc::length_offset_in_bytes(),                                                  
493                 index->as_jint(), null_check_info);                                                                                  
494     __ branch(lir_cond_belowEqual, T_INT, stub); // forward branch                                                                   
495   } else {                                                                                                                           
496     cmp_reg_mem(lir_cond_aboveEqual, index, array,                                                                                   
497                 arrayOopDesc::length_offset_in_bytes(), T_INT, null_check_info);                                                     
498     __ branch(lir_cond_aboveEqual, T_INT, stub); // forward branch                                                                   
499   }                                                                                                                                  
500 }                                                                                                                                    
501 
502 
503 void LIRGenerator::nio_range_check(LIR_Opr buffer, LIR_Opr index, LIR_Opr result, CodeEmitInfo* info) {                              
504   CodeStub* stub = new RangeCheckStub(info, index, true);                                                                            
505   if (index->is_constant()) {                                                                                                        
506     cmp_mem_int(lir_cond_belowEqual, buffer, java_nio_Buffer::limit_offset(), index->as_jint(), info);                               
507     __ branch(lir_cond_belowEqual, T_INT, stub); // forward branch                                                                   
508   } else {                                                                                                                           
509     cmp_reg_mem(lir_cond_aboveEqual, index, buffer,                                                                                  
510                 java_nio_Buffer::limit_offset(), T_INT, info);                                                                       
511     __ branch(lir_cond_aboveEqual, T_INT, stub); // forward branch                                                                   
512   }                                                                                                                                  
513   __ move(index, result);                                                                                                            
514 }                                                                                                                                    
515 
516 
517 
518 void LIRGenerator::arithmetic_op(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, bool is_strictfp, LIR_Opr tmp_op,
519   LIR_Opr result_op = result;                                                                                                        
520   LIR_Opr left_op   = left;                                                                                                          
521   LIR_Opr right_op  = right;                                                                                                         
522 
523   if (TwoOperandLIRForm && left_op != result_op) {                                                                                   
524     assert(right_op != result_op, "malformed");                                                                                      
525     __ move(left_op, result_op);                                                                                                     
526     left_op = result_op;                                                                                                             
527   }                                                                                                                                  
528 
529   switch(code) {                                                                                                                     
530     case Bytecodes::_dadd:                                                                                                           
531     case Bytecodes::_fadd:                                                                                                           
532     case Bytecodes::_ladd:                                                                                                           
533     case Bytecodes::_iadd:  __ add(left_op, right_op, result_op); break;                                                             
534     case Bytecodes::_fmul:                                                                                                           
535     case Bytecodes::_lmul:  __ mul(left_op, right_op, result_op); break;                                                             
536 
537     case Bytecodes::_dmul:                                                                                                           
538       {                                                                                                                              
539         if (is_strictfp) {                                                                                                           
540           __ mul_strictfp(left_op, right_op, result_op, tmp_op); break;                                                              
541         } else {                                                                                                                     
542           __ mul(left_op, right_op, result_op); break;                                                                               
543         }                                                                                                                            
544       }                                                                                                                              
545       break;                                                                                                                         
546 
547     case Bytecodes::_imul:                                                                                                           
548       {                                                                                                                              
549         bool did_strength_reduce = false;                                                                                            
550 
551         if (right->is_constant()) {                                                                                                  
552           jint c = right->as_jint();                                                                                                 
553           if (c > 0 && is_power_of_2(c)) {                                                                                           
554             // do not need tmp here                                                                                                  
555             __ shift_left(left_op, exact_log2(c), result_op);                                                                        
556             did_strength_reduce = true;                                                                                              
557           } else {                                                                                                                   
558             did_strength_reduce = strength_reduce_multiply(left_op, c, result_op, tmp_op);                                           
559           }                                                                                                                          
560         }                                                                                                                            
561         // we couldn't strength reduce so just emit the multiply                                                                     
562         if (!did_strength_reduce) {                                                                                                  
563           __ mul(left_op, right_op, result_op);                                                                                      
564         }                                                                                                                            
565       }                                                                                                                              
566       break;                                                                                                                         
567 
568     case Bytecodes::_dsub:                                                                                                           
569     case Bytecodes::_fsub:                                                                                                           
570     case Bytecodes::_lsub:                                                                                                           
571     case Bytecodes::_isub: __ sub(left_op, right_op, result_op); break;                                                              
572 
573     case Bytecodes::_fdiv: __ div (left_op, right_op, result_op); break;                                                             
574     // ldiv and lrem are implemented with a direct runtime call                                                                      
575 
576     case Bytecodes::_ddiv:                                                                                                           
577       {                                                                                                                              
578         if (is_strictfp) {                                                                                                           
579           __ div_strictfp (left_op, right_op, result_op, tmp_op); break;                                                             
580         } else {                                                                                                                     
581           __ div (left_op, right_op, result_op); break;                                                                              
582         }                                                                                                                            
583       }                                                                                                                              
584       break;                                                                                                                         
585 
586     case Bytecodes::_drem:                                                                                                           
587     case Bytecodes::_frem: __ rem (left_op, right_op, result_op); break;                                                             
588 
589     default: ShouldNotReachHere();                                                                                                   
590   }                                                                                                                                  
591 }                                                                                                                                    
592 
593 
594 void LIRGenerator::arithmetic_op_int(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, LIR_Opr tmp) {               
595   arithmetic_op(code, result, left, right, false, tmp);                                                                              
596 }                                                                                                                                    
597 
598 
599 void LIRGenerator::arithmetic_op_long(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, CodeEmitInfo* info) {       
600   arithmetic_op(code, result, left, right, false, LIR_OprFact::illegalOpr, info);                                                    
601 }                                                                                                                                    
602 
603 
604 void LIRGenerator::arithmetic_op_fpu(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, bool is_strictfp, LIR_Opr tmp
605   arithmetic_op(code, result, left, right, is_strictfp, tmp);                                                                        
606 }                                                                                                                                    
607 
608 
609 void LIRGenerator::shift_op(Bytecodes::Code code, LIR_Opr result_op, LIR_Opr value, LIR_Opr count, LIR_Opr tmp) {                    
610 
611   if (TwoOperandLIRForm && value != result_op                                                                                        
612       // Only 32bit right shifts require two operand form on S390.                                                                   
613       S390_ONLY(&& (code == Bytecodes::_ishr || code == Bytecodes::_iushr))) {                                                       
614     assert(count != result_op, "malformed");                                                                                         
615     __ move(value, result_op);                                                                                                       
616     value = result_op;                                                                                                               
617   }                                                                                                                                  
618 
619   assert(count->is_constant() || count->is_register(), "must be");                                                                   
620   switch(code) {                                                                                                                     
621   case Bytecodes::_ishl:                                                                                                             
622   case Bytecodes::_lshl: __ shift_left(value, count, result_op, tmp); break;                                                         
623   case Bytecodes::_ishr:                                                                                                             
624   case Bytecodes::_lshr: __ shift_right(value, count, result_op, tmp); break;                                                        
625   case Bytecodes::_iushr:                                                                                                            
626   case Bytecodes::_lushr: __ unsigned_shift_right(value, count, result_op, tmp); break;                                              
627   default: ShouldNotReachHere();                                                                                                     
628   }                                                                                                                                  
629 }                                                                                                                                    
630 
631 
632 void LIRGenerator::logic_op (Bytecodes::Code code, LIR_Opr result_op, LIR_Opr left_op, LIR_Opr right_op) {                           
633   if (TwoOperandLIRForm && left_op != result_op) {                                                                                   
634     assert(right_op != result_op, "malformed");                                                                                      
635     __ move(left_op, result_op);                                                                                                     
636     left_op = result_op;                                                                                                             
637   }                                                                                                                                  
638 
639   switch(code) {                                                                                                                     
640     case Bytecodes::_iand:                                                                                                           
641     case Bytecodes::_land:  __ logical_and(left_op, right_op, result_op); break;                                                     
642 
643     case Bytecodes::_ior:                                                                                                            
644     case Bytecodes::_lor:   __ logical_or(left_op, right_op, result_op);  break;                                                     
645 
646     case Bytecodes::_ixor:                                                                                                           
647     case Bytecodes::_lxor:  __ logical_xor(left_op, right_op, result_op); break;                                                     
648 
649     default: ShouldNotReachHere();                                                                                                   
650   }                                                                                                                                  
651 }                                                                                                                                    
652 
653 
654 void LIRGenerator::monitor_enter(LIR_Opr object, LIR_Opr lock, LIR_Opr hdr, LIR_Opr scratch, int monitor_no, CodeEmitInfo* info_for_e
655   if (!GenerateSynchronizationCode) return;                                                                                          
656   // for slow path, use debug info for state after successful locking                                                                
657   CodeStub* slow_path = new MonitorEnterStub(object, lock, info);                                                                    
658   __ load_stack_address_monitor(monitor_no, lock);                                                                                   
659   // for handling NullPointerException, use debug info representing just the lock stack before this monitorenter                     
660   __ lock_object(hdr, object, lock, scratch, slow_path, info_for_exception);                                                         
661 }                                                                                                                                    
662 
663 
664 void LIRGenerator::monitor_exit(LIR_Opr object, LIR_Opr lock, LIR_Opr new_hdr, LIR_Opr scratch, int monitor_no) {                    
665   if (!GenerateSynchronizationCode) return;                                                                                          
666   // setup registers                                                                                                                 
667   LIR_Opr hdr = lock;                                                                                                                
668   lock = new_hdr;                                                                                                                    
669   CodeStub* slow_path = new MonitorExitStub(lock, UseFastLocking, monitor_no);                                                       
670   __ load_stack_address_monitor(monitor_no, lock);                                                                                   
671   __ unlock_object(hdr, object, lock, scratch, slow_path);                                                                           
672 }                                                                                                                                    
673 
674 #ifndef PRODUCT                                                                                                                      
675 void LIRGenerator::print_if_not_loaded(const NewInstance* new_instance) {                                                            
676   if (PrintNotLoaded && !new_instance->klass()->is_loaded()) {                                                                       
677     tty->print_cr("   ###class not loaded at new bci %d", new_instance->printable_bci());                                            
678   } else if (PrintNotLoaded && (TieredCompilation && new_instance->is_unresolved())) {                                               
679     tty->print_cr("   ###class not resolved at new bci %d", new_instance->printable_bci());                                          
680   }                                                                                                                                  
681 }                                                                                                                                    
682 #endif                                                                                                                               
683 
684 void LIRGenerator::new_instance(LIR_Opr dst, ciInstanceKlass* klass, bool is_unresolved, LIR_Opr scratch1, LIR_Opr scratch2, LIR_Opr 
685   klass2reg_with_patching(klass_reg, klass, info, is_unresolved);                                                                    
686   // If klass is not loaded we do not know if the klass has finalizers:                                                              
687   if (UseFastNewInstance && klass->is_loaded()                                                                                       
688       && !Klass::layout_helper_needs_slow_path(klass->layout_helper())) {                                                            
689 
690     Runtime1::StubID stub_id = klass->is_initialized() ? Runtime1::fast_new_instance_id : Runtime1::fast_new_instance_init_check_id; 
691 
692     CodeStub* slow_path = new NewInstanceStub(klass_reg, dst, klass, info, stub_id);                                                 
693 
694     assert(klass->is_loaded(), "must be loaded");                                                                                    
695     // allocate space for instance                                                                                                   
696     assert(klass->size_helper() >= 0, "illegal instance size");                                                                      
697     const int instance_size = align_object_size(klass->size_helper());                                                               
698     __ allocate_object(dst, scratch1, scratch2, scratch3, scratch4,                                                                  
699                        oopDesc::header_size(), instance_size, klass_reg, !klass->is_initialized(), slow_path);                       
700   } else {                                                                                                                           
701     CodeStub* slow_path = new NewInstanceStub(klass_reg, dst, klass, info, Runtime1::new_instance_id);                               
702     __ branch(lir_cond_always, T_ILLEGAL, slow_path);                                                                                
703     __ branch_destination(slow_path->continuation());                                                                                
704   }                                                                                                                                  
705 }                                                                                                                                    
706 
707 
708 static bool is_constant_zero(Instruction* inst) {                                                                                    
709   IntConstant* c = inst->type()->as_IntConstant();                                                                                   
710   if (c) {                                                                                                                           
711     return (c->value() == 0);                                                                                                        
712   }                                                                                                                                  
713   return false;                                                                                                                      
714 }                                                                                                                                    
715 
716 
717 static bool positive_constant(Instruction* inst) {                                                                                   
718   IntConstant* c = inst->type()->as_IntConstant();                                                                                   
719   if (c) {                                                                                                                           
720     return (c->value() >= 0);                                                                                                        
721   }                                                                                                                                  
722   return false;                                                                                                                      
723 }                                                                                                                                    
724 
725 
726 static ciArrayKlass* as_array_klass(ciType* type) {                                                                                  
727   if (type != NULL && type->is_array_klass() && type->is_loaded()) {                                                                 
728     return (ciArrayKlass*)type;                                                                                                      
729   } else {                                                                                                                           
730     return NULL;                                                                                                                     
731   }                                                                                                                                  
732 }                                                                                                                                    
733 
734 static ciType* phi_declared_type(Phi* phi) {                                                                                         
735   ciType* t = phi->operand_at(0)->declared_type();                                                                                   
736   if (t == NULL) {                                                                                                                   
737     return NULL;                                                                                                                     
738   }                                                                                                                                  
739   for(int i = 1; i < phi->operand_count(); i++) {                                                                                    
740     if (t != phi->operand_at(i)->declared_type()) {                                                                                  
741       return NULL;                                                                                                                   
742     }                                                                                                                                
743   }                                                                                                                                  
744   return t;                                                                                                                          
745 }                                                                                                                                    
746 
747 void LIRGenerator::arraycopy_helper(Intrinsic* x, int* flagsp, ciArrayKlass** expected_typep) {                                      
748   Instruction* src     = x->argument_at(0);                                                                                          
749   Instruction* src_pos = x->argument_at(1);                                                                                          
750   Instruction* dst     = x->argument_at(2);                                                                                          
751   Instruction* dst_pos = x->argument_at(3);                                                                                          
752   Instruction* length  = x->argument_at(4);                                                                                          
753 
754   // first try to identify the likely type of the arrays involved                                                                    
755   ciArrayKlass* expected_type = NULL;                                                                                                
756   bool is_exact = false, src_objarray = false, dst_objarray = false;                                                                 
757   {                                                                                                                                  
758     ciArrayKlass* src_exact_type    = as_array_klass(src->exact_type());                                                             
759     ciArrayKlass* src_declared_type = as_array_klass(src->declared_type());                                                          
760     Phi* phi;                                                                                                                        
761     if (src_declared_type == NULL && (phi = src->as_Phi()) != NULL) {                                                                
762       src_declared_type = as_array_klass(phi_declared_type(phi));                                                                    
763     }                                                                                                                                
764     ciArrayKlass* dst_exact_type    = as_array_klass(dst->exact_type());                                                             
765     ciArrayKlass* dst_declared_type = as_array_klass(dst->declared_type());                                                          
766     if (dst_declared_type == NULL && (phi = dst->as_Phi()) != NULL) {                                                                
767       dst_declared_type = as_array_klass(phi_declared_type(phi));                                                                    
768     }                                                                                                                                
769 
770     if (src_exact_type != NULL && src_exact_type == dst_exact_type) {                                                                
771       // the types exactly match so the type is fully known                                                                          
772       is_exact = true;                                                                                                               
773       expected_type = src_exact_type;                                                                                                
774     } else if (dst_exact_type != NULL && dst_exact_type->is_obj_array_klass()) {                                                     
775       ciArrayKlass* dst_type = (ciArrayKlass*) dst_exact_type;                                                                       
776       ciArrayKlass* src_type = NULL;                                                                                                 
777       if (src_exact_type != NULL && src_exact_type->is_obj_array_klass()) {                                                          
778         src_type = (ciArrayKlass*) src_exact_type;                                                                                   
779       } else if (src_declared_type != NULL && src_declared_type->is_obj_array_klass()) {                                             
780         src_type = (ciArrayKlass*) src_declared_type;                                                                                
781       }                                                                                                                              
782       if (src_type != NULL) {                                                                                                        
783         if (src_type->element_type()->is_subtype_of(dst_type->element_type())) {                                                     
784           is_exact = true;                                                                                                           
785           expected_type = dst_type;                                                                                                  
786         }                                                                                                                            
787       }                                                                                                                              
788     }                                                                                                                                
789     // at least pass along a good guess                                                                                              
790     if (expected_type == NULL) expected_type = dst_exact_type;                                                                       
791     if (expected_type == NULL) expected_type = src_declared_type;                                                                    
792     if (expected_type == NULL) expected_type = dst_declared_type;                                                                    
793 
794     src_objarray = (src_exact_type && src_exact_type->is_obj_array_klass()) || (src_declared_type && src_declared_type->is_obj_array_
795     dst_objarray = (dst_exact_type && dst_exact_type->is_obj_array_klass()) || (dst_declared_type && dst_declared_type->is_obj_array_
796   }                                                                                                                                  
797 
798   // if a probable array type has been identified, figure out if any                                                                 
799   // of the required checks for a fast case can be elided.                                                                           
800   int flags = LIR_OpArrayCopy::all_flags;                                                                                            
801 
802   if (!src_objarray)                                                                                                                 
803     flags &= ~LIR_OpArrayCopy::src_objarray;                                                                                         
804   if (!dst_objarray)                                                                                                                 
805     flags &= ~LIR_OpArrayCopy::dst_objarray;                                                                                         
806 
807   if (!x->arg_needs_null_check(0))                                                                                                   
808     flags &= ~LIR_OpArrayCopy::src_null_check;                                                                                       
809   if (!x->arg_needs_null_check(2))                                                                                                   
810     flags &= ~LIR_OpArrayCopy::dst_null_check;                                                                                       
811 
812 
813   if (expected_type != NULL) {                                                                                                       
814     Value length_limit = NULL;                                                                                                       
815 
816     IfOp* ifop = length->as_IfOp();                                                                                                  
817     if (ifop != NULL) {                                                                                                              
818       // look for expressions like min(v, a.length) which ends up as                                                                 
819       //   x > y ? y : x  or  x >= y ? y : x                                                                                         
820       if ((ifop->cond() == If::gtr || ifop->cond() == If::geq) &&                                                                    
821           ifop->x() == ifop->fval() &&                                                                                               
822           ifop->y() == ifop->tval()) {                                                                                               
823         length_limit = ifop->y();                                                                                                    
824       }                                                                                                                              
825     }                                                                                                                                
826 
827     // try to skip null checks and range checks                                                                                      
828     NewArray* src_array = src->as_NewArray();                                                                                        
829     if (src_array != NULL) {                                                                                                         
830       flags &= ~LIR_OpArrayCopy::src_null_check;                                                                                     
831       if (length_limit != NULL &&                                                                                                    
832           src_array->length() == length_limit &&                                                                                     
833           is_constant_zero(src_pos)) {                                                                                               
834         flags &= ~LIR_OpArrayCopy::src_range_check;                                                                                  
835       }                                                                                                                              
836     }                                                                                                                                
837 
838     NewArray* dst_array = dst->as_NewArray();                                                                                        
839     if (dst_array != NULL) {                                                                                                         
840       flags &= ~LIR_OpArrayCopy::dst_null_check;                                                                                     
841       if (length_limit != NULL &&                                                                                                    
842           dst_array->length() == length_limit &&                                                                                     
843           is_constant_zero(dst_pos)) {                                                                                               
844         flags &= ~LIR_OpArrayCopy::dst_range_check;                                                                                  
845       }                                                                                                                              
846     }                                                                                                                                
847 
848     // check from incoming constant values                                                                                           
849     if (positive_constant(src_pos))                                                                                                  
850       flags &= ~LIR_OpArrayCopy::src_pos_positive_check;                                                                             
851     if (positive_constant(dst_pos))                                                                                                  
852       flags &= ~LIR_OpArrayCopy::dst_pos_positive_check;                                                                             
853     if (positive_constant(length))                                                                                                   
854       flags &= ~LIR_OpArrayCopy::length_positive_check;                                                                              
855 
856     // see if the range check can be elided, which might also imply                                                                  
857     // that src or dst is non-null.                                                                                                  
858     ArrayLength* al = length->as_ArrayLength();                                                                                      
859     if (al != NULL) {                                                                                                                
860       if (al->array() == src) {                                                                                                      
861         // it's the length of the source array                                                                                       
862         flags &= ~LIR_OpArrayCopy::length_positive_check;                                                                            
863         flags &= ~LIR_OpArrayCopy::src_null_check;                                                                                   
864         if (is_constant_zero(src_pos))                                                                                               
865           flags &= ~LIR_OpArrayCopy::src_range_check;                                                                                
866       }                                                                                                                              
867       if (al->array() == dst) {                                                                                                      
868         // it's the length of the destination array                                                                                  
869         flags &= ~LIR_OpArrayCopy::length_positive_check;                                                                            
870         flags &= ~LIR_OpArrayCopy::dst_null_check;                                                                                   
871         if (is_constant_zero(dst_pos))                                                                                               
872           flags &= ~LIR_OpArrayCopy::dst_range_check;                                                                                
873       }                                                                                                                              
874     }                                                                                                                                
875     if (is_exact) {                                                                                                                  
876       flags &= ~LIR_OpArrayCopy::type_check;                                                                                         
877     }                                                                                                                                
878   }                                                                                                                                  
879 
880   IntConstant* src_int = src_pos->type()->as_IntConstant();                                                                          
881   IntConstant* dst_int = dst_pos->type()->as_IntConstant();                                                                          
882   if (src_int && dst_int) {                                                                                                          
883     int s_offs = src_int->value();                                                                                                   
884     int d_offs = dst_int->value();                                                                                                   
885     if (src_int->value() >= dst_int->value()) {                                                                                      
886       flags &= ~LIR_OpArrayCopy::overlapping;                                                                                        
887     }                                                                                                                                
888     if (expected_type != NULL) {                                                                                                     
889       BasicType t = expected_type->element_type()->basic_type();                                                                     
890       int element_size = type2aelembytes(t);                                                                                         
891       if (((arrayOopDesc::base_offset_in_bytes(t) + s_offs * element_size) % HeapWordSize == 0) &&                                   
892           ((arrayOopDesc::base_offset_in_bytes(t) + d_offs * element_size) % HeapWordSize == 0)) {                                   
893         flags &= ~LIR_OpArrayCopy::unaligned;                                                                                        
894       }                                                                                                                              
895     }                                                                                                                                
896   } else if (src_pos == dst_pos || is_constant_zero(dst_pos)) {                                                                      
897     // src and dest positions are the same, or dst is zero so assume                                                                 
898     // nonoverlapping copy.                                                                                                          
899     flags &= ~LIR_OpArrayCopy::overlapping;                                                                                          
900   }                                                                                                                                  
901 
902   if (src == dst) {                                                                                                                  
903     // moving within a single array so no type checks are needed                                                                     
904     if (flags & LIR_OpArrayCopy::type_check) {                                                                                       
905       flags &= ~LIR_OpArrayCopy::type_check;                                                                                         
906     }                                                                                                                                
907   }                                                                                                                                  
908   *flagsp = flags;                                                                                                                   
909   *expected_typep = (ciArrayKlass*)expected_type;                                                                                    
910 }                                                                                                                                    
911 
912 
913 LIR_Opr LIRGenerator::round_item(LIR_Opr opr) {                                                                                      
914   assert(opr->is_register(), "why spill if item is not register?");                                                                  
915 
916   if (RoundFPResults && UseSSE < 1 && opr->is_single_fpu()) {                                                                        
917     LIR_Opr result = new_register(T_FLOAT);                                                                                          
918     set_vreg_flag(result, must_start_in_memory);                                                                                     
919     assert(opr->is_register(), "only a register can be spilled");                                                                    
920     assert(opr->value_type()->is_float(), "rounding only for floats available");                                                     
921     __ roundfp(opr, LIR_OprFact::illegalOpr, result);                                                                                
922     return result;                                                                                                                   
923   }                                                                                                                                  
924   return opr;                                                                                                                        
925 }                                                                                                                                    
926 
927 
928 LIR_Opr LIRGenerator::force_to_spill(LIR_Opr value, BasicType t) {                                                                   
929   assert(type2size[t] == type2size[value->type()],                                                                                   
930          "size mismatch: t=%s, value->type()=%s", type2name(t), type2name(value->type()));                                           
931   if (!value->is_register()) {                                                                                                       
932     // force into a register                                                                                                         
933     LIR_Opr r = new_register(value->type());                                                                                         
934     __ move(value, r);                                                                                                               
935     value = r;                                                                                                                       
936   }                                                                                                                                  
937 
938   // create a spill location                                                                                                         
939   LIR_Opr tmp = new_register(t);                                                                                                     
940   set_vreg_flag(tmp, LIRGenerator::must_start_in_memory);                                                                            
941 
942   // move from register to spill                                                                                                     
943   __ move(value, tmp);                                                                                                               
944   return tmp;                                                                                                                        
945 }                                                                                                                                    
946 
947 void LIRGenerator::profile_branch(If* if_instr, If::Condition cond) {                                                                
948   if (if_instr->should_profile()) {                                                                                                  
949     ciMethod* method = if_instr->profiled_method();                                                                                  
950     assert(method != NULL, "method should be set if branch is profiled");                                                            
951     ciMethodData* md = method->method_data_or_null();                                                                                
952     assert(md != NULL, "Sanity");                                                                                                    
953     ciProfileData* data = md->bci_to_data(if_instr->profiled_bci());                                                                 
954     assert(data != NULL, "must have profiling data");                                                                                
955     assert(data->is_BranchData(), "need BranchData for two-way branches");                                                           
956     int taken_count_offset     = md->byte_offset_of_slot(data, BranchData::taken_offset());                                          
957     int not_taken_count_offset = md->byte_offset_of_slot(data, BranchData::not_taken_offset());                                      
958     if (if_instr->is_swapped()) {                                                                                                    
959       int t = taken_count_offset;                                                                                                    
960       taken_count_offset = not_taken_count_offset;                                                                                   
961       not_taken_count_offset = t;                                                                                                    
962     }                                                                                                                                
963 
964     LIR_Opr md_reg = new_register(T_METADATA);                                                                                       
965     __ metadata2reg(md->constant_encoding(), md_reg);                                                                                
966 
967     LIR_Opr data_offset_reg = new_pointer_register();                                                                                
968     __ cmove(lir_cond(cond),                                                                                                         
969              LIR_OprFact::intptrConst(taken_count_offset),                                                                           
970              LIR_OprFact::intptrConst(not_taken_count_offset),                                                                       
971              data_offset_reg, as_BasicType(if_instr->x()->type()));                                                                  
972 
973     // MDO cells are intptr_t, so the data_reg width is arch-dependent.                                                              
974     LIR_Opr data_reg = new_pointer_register();                                                                                       
975     LIR_Address* data_addr = new LIR_Address(md_reg, data_offset_reg, data_reg->type());                                             
976     __ move(data_addr, data_reg);                                                                                                    
977     // Use leal instead of add to avoid destroying condition codes on x86                                                            
978     LIR_Address* fake_incr_value = new LIR_Address(data_reg, DataLayout::counter_increment, T_INT);                                  
979     __ leal(LIR_OprFact::address(fake_incr_value), data_reg);                                                                        
980     __ move(data_reg, data_addr);                                                                                                    
981   }                                                                                                                                  
982 }                                                                                                                                    
983 
984 // Phi technique:                                                                                                                    
985 // This is about passing live values from one basic block to the other.                                                              
986 // In code generated with Java it is rather rare that more than one                                                                  
987 // value is on the stack from one basic block to the other.                                                                          
988 // We optimize our technique for efficient passing of one value                                                                      
989 // (of type long, int, double..) but it can be extended.                                                                             
990 // When entering or leaving a basic block, all registers and all spill                                                               
991 // slots are release and empty. We use the released registers                                                                        
992 // and spill slots to pass the live values from one block                                                                            
993 // to the other. The topmost value, i.e., the value on TOS of expression                                                             
994 // stack is passed in registers. All other values are stored in spilling                                                             
995 // area. Every Phi has an index which designates its spill slot                                                                      
996 // At exit of a basic block, we fill the register(s) and spill slots.                                                                
997 // At entry of a basic block, the block_prolog sets up the content of phi nodes                                                      
998 // and locks necessary registers and spilling slots.                                                                                 
999 
1000 
1001 // move current value to referenced phi function                                                                                     
1002 void LIRGenerator::move_to_phi(PhiResolver* resolver, Value cur_val, Value sux_val) {                                                
1003   Phi* phi = sux_val->as_Phi();                                                                                                      
1004   // cur_val can be null without phi being null in conjunction with inlining                                                         
1005   if (phi != NULL && cur_val != NULL && cur_val != phi && !phi->is_illegal()) {                                                      
1006     Phi* cur_phi = cur_val->as_Phi();                                                                                                
1007     if (cur_phi != NULL && cur_phi->is_illegal()) {                                                                                  
1008       // Phi and local would need to get invalidated                                                                                 
1009       // (which is unexpected for Linear Scan).                                                                                      
1010       // But this case is very rare so we simply bail out.                                                                           
1011       bailout("propagation of illegal phi");                                                                                         
1012       return;                                                                                                                        
1013     }                                                                                                                                
1014     LIR_Opr operand = cur_val->operand();                                                                                            
1015     if (operand->is_illegal()) {                                                                                                     
1016       assert(cur_val->as_Constant() != NULL || cur_val->as_Local() != NULL,                                                          
1017              "these can be produced lazily");                                                                                        
1018       operand = operand_for_instruction(cur_val);                                                                                    
1019     }                                                                                                                                
1020     resolver->move(operand, operand_for_instruction(phi));                                                                           
1021   }                                                                                                                                  
1022 }                                                                                                                                    
1023 
1024 
1025 // Moves all stack values into their PHI position                                                                                    
1026 void LIRGenerator::move_to_phi(ValueStack* cur_state) {                                                                              
1027   BlockBegin* bb = block();                                                                                                          
1028   if (bb->number_of_sux() == 1) {                                                                                                    
1029     BlockBegin* sux = bb->sux_at(0);                                                                                                 
1030     assert(sux->number_of_preds() > 0, "invalid CFG");                                                                               
1031 
1032     // a block with only one predecessor never has phi functions                                                                     
1033     if (sux->number_of_preds() > 1) {                                                                                                
1034       int max_phis = cur_state->stack_size() + cur_state->locals_size();                                                             
1035       PhiResolver resolver(this, _virtual_register_number + max_phis * 2);                                                           
1036 
1037       ValueStack* sux_state = sux->state();                                                                                          
1038       Value sux_value;                                                                                                               
1039       int index;                                                                                                                     
1040 
1041       assert(cur_state->scope() == sux_state->scope(), "not matching");                                                              
1042       assert(cur_state->locals_size() == sux_state->locals_size(), "not matching");                                                  
1043       assert(cur_state->stack_size() == sux_state->stack_size(), "not matching");                                                    
1044 
1045       for_each_stack_value(sux_state, index, sux_value) {                                                                            
1046         move_to_phi(&resolver, cur_state->stack_at(index), sux_value);                                                               
1047       }                                                                                                                              
1048 
1049       for_each_local_value(sux_state, index, sux_value) {                                                                            
1050         move_to_phi(&resolver, cur_state->local_at(index), sux_value);                                                               
1051       }                                                                                                                              
1052 
1053       assert(cur_state->caller_state() == sux_state->caller_state(), "caller states must be equal");                                 
1054     }                                                                                                                                
1055   }                                                                                                                                  
1056 }                                                                                                                                    
1057 
1058 
1059 LIR_Opr LIRGenerator::new_register(BasicType type) {                                                                                 
1060   int vreg = _virtual_register_number;                                                                                               
1061   // add a little fudge factor for the bailout, since the bailout is                                                                 
1062   // only checked periodically.  This gives a few extra registers to                                                                 
1063   // hand out before we really run out, which helps us keep from                                                                     
1064   // tripping over assertions.                                                                                                       
1065   if (vreg + 20 >= LIR_OprDesc::vreg_max) {                                                                                          
1066     bailout("out of virtual registers");                                                                                             
1067     if (vreg + 2 >= LIR_OprDesc::vreg_max) {                                                                                         
1068       // wrap it around                                                                                                              
1069       _virtual_register_number = LIR_OprDesc::vreg_base;                                                                             
1070     }                                                                                                                                
1071   }                                                                                                                                  
1072   _virtual_register_number += 1;                                                                                                     
1073   return LIR_OprFact::virtual_register(vreg, type);                                                                                  
1074 }                                                                                                                                    
1075 
1076 
1077 // Try to lock using register in hint                                                                                                
1078 LIR_Opr LIRGenerator::rlock(Value instr) {                                                                                           
1079   return new_register(instr->type());                                                                                                
1080 }                                                                                                                                    
1081 
1082 
1083 // does an rlock and sets result                                                                                                     
1084 LIR_Opr LIRGenerator::rlock_result(Value x) {                                                                                        
1085   LIR_Opr reg = rlock(x);                                                                                                            
1086   set_result(x, reg);                                                                                                                
1087   return reg;                                                                                                                        
1088 }                                                                                                                                    
1089 
1090 
1091 // does an rlock and sets result                                                                                                     
1092 LIR_Opr LIRGenerator::rlock_result(Value x, BasicType type) {                                                                        
1093   LIR_Opr reg;                                                                                                                       
1094   switch (type) {                                                                                                                    
1095   case T_BYTE:                                                                                                                       
1096   case T_BOOLEAN:                                                                                                                    
1097     reg = rlock_byte(type);                                                                                                          
1098     break;                                                                                                                           
1099   default:                                                                                                                           
1100     reg = rlock(x);                                                                                                                  
1101     break;                                                                                                                           
1102   }                                                                                                                                  
1103 
1104   set_result(x, reg);                                                                                                                
1105   return reg;                                                                                                                        
1106 }                                                                                                                                    
1107 
1108 
1109 //---------------------------------------------------------------------                                                              
1110 ciObject* LIRGenerator::get_jobject_constant(Value value) {                                                                          
1111   ObjectType* oc = value->type()->as_ObjectType();                                                                                   
1112   if (oc) {                                                                                                                          
1113     return oc->constant_value();                                                                                                     
1114   }                                                                                                                                  
1115   return NULL;                                                                                                                       
1116 }                                                                                                                                    
1117 
1118 
1119 void LIRGenerator::do_ExceptionObject(ExceptionObject* x) {                                                                          
1120   assert(block()->is_set(BlockBegin::exception_entry_flag), "ExceptionObject only allowed in exception handler block");              
1121   assert(block()->next() == x, "ExceptionObject must be first instruction of block");                                                
1122 
1123   // no moves are created for phi functions at the begin of exception                                                                
1124   // handlers, so assign operands manually here                                                                                      
1125   for_each_phi_fun(block(), phi,                                                                                                     
1126                    operand_for_instruction(phi));                                                                                    
1127 
1128   LIR_Opr thread_reg = getThreadPointer();                                                                                           
1129   __ move_wide(new LIR_Address(thread_reg, in_bytes(JavaThread::exception_oop_offset()), T_OBJECT),                                  
1130                exceptionOopOpr());                                                                                                   
1131   __ move_wide(LIR_OprFact::oopConst(NULL),                                                                                          
1132                new LIR_Address(thread_reg, in_bytes(JavaThread::exception_oop_offset()), T_OBJECT));                                 
1133   __ move_wide(LIR_OprFact::oopConst(NULL),                                                                                          
1134                new LIR_Address(thread_reg, in_bytes(JavaThread::exception_pc_offset()), T_OBJECT));                                  
1135 
1136   LIR_Opr result = new_register(T_OBJECT);                                                                                           
1137   __ move(exceptionOopOpr(), result);                                                                                                
1138   set_result(x, result);                                                                                                             
1139 }                                                                                                                                    
1140 
1141 
1142 //----------------------------------------------------------------------                                                             
1143 //----------------------------------------------------------------------                                                             
1144 //----------------------------------------------------------------------                                                             
1145 //----------------------------------------------------------------------                                                             
1146 //                        visitor functions                                                                                          
1147 //----------------------------------------------------------------------                                                             
1148 //----------------------------------------------------------------------                                                             
1149 //----------------------------------------------------------------------                                                             
1150 //----------------------------------------------------------------------                                                             
1151 
1152 void LIRGenerator::do_Phi(Phi* x) {                                                                                                  
1153   // phi functions are never visited directly                                                                                        
1154   ShouldNotReachHere();                                                                                                              
1155 }                                                                                                                                    
1156 
1157 
1158 // Code for a constant is generated lazily unless the constant is frequently used and can't be inlined.                              
1159 void LIRGenerator::do_Constant(Constant* x) {                                                                                        
1160   if (x->state_before() != NULL) {                                                                                                   
1161     // Any constant with a ValueStack requires patching so emit the patch here                                                       
1162     LIR_Opr reg = rlock_result(x);                                                                                                   
1163     CodeEmitInfo* info = state_for(x, x->state_before());                                                                            
1164     __ oop2reg_patch(NULL, reg, info);                                                                                               
1165   } else if (x->use_count() > 1 && !can_inline_as_constant(x)) {                                                                     
1166     if (!x->is_pinned()) {                                                                                                           
1167       // unpinned constants are handled specially so that they can be                                                                
1168       // put into registers when they are used multiple times within a                                                               
1169       // block.  After the block completes their operand will be                                                                     
1170       // cleared so that other blocks can't refer to that register.                                                                  
1171       set_result(x, load_constant(x));                                                                                               
1172     } else {                                                                                                                         
1173       LIR_Opr res = x->operand();                                                                                                    
1174       if (!res->is_valid()) {                                                                                                        
1175         res = LIR_OprFact::value_type(x->type());                                                                                    
1176       }                                                                                                                              
1177       if (res->is_constant()) {                                                                                                      
1178         LIR_Opr reg = rlock_result(x);                                                                                               
1179         __ move(res, reg);                                                                                                           
1180       } else {                                                                                                                       
1181         set_result(x, res);                                                                                                          
1182       }                                                                                                                              
1183     }                                                                                                                                
1184   } else {                                                                                                                           
1185     set_result(x, LIR_OprFact::value_type(x->type()));                                                                               
1186   }                                                                                                                                  
1187 }                                                                                                                                    
1188 
1189 
1190 void LIRGenerator::do_Local(Local* x) {                                                                                              
1191   // operand_for_instruction has the side effect of setting the result                                                               
1192   // so there's no need to do it here.                                                                                               
1193   operand_for_instruction(x);                                                                                                        
1194 }                                                                                                                                    
1195 
1196 
1197 void LIRGenerator::do_IfInstanceOf(IfInstanceOf* x) {                                                                                
1198   Unimplemented();                                                                                                                   
1199 }                                                                                                                                    
1200 
1201 
1202 void LIRGenerator::do_Return(Return* x) {                                                                                            
1203   if (compilation()->env()->dtrace_method_probes()) {                                                                                
1204     BasicTypeList signature;                                                                                                         
1205     signature.append(LP64_ONLY(T_LONG) NOT_LP64(T_INT));    // thread                                                                
1206     signature.append(T_METADATA); // Method*                                                                                         
1207     LIR_OprList* args = new LIR_OprList();                                                                                           
1208     args->append(getThreadPointer());                                                                                                
1209     LIR_Opr meth = new_register(T_METADATA);                                                                                         
1210     __ metadata2reg(method()->constant_encoding(), meth);                                                                            
1211     args->append(meth);                                                                                                              
1212     call_runtime(&signature, args, CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), voidType, NULL);                    
1213   }                                                                                                                                  
1214 
1215   if (x->type()->is_void()) {                                                                                                        
1216     __ return_op(LIR_OprFact::illegalOpr);                                                                                           
1217   } else {                                                                                                                           
1218     LIR_Opr reg = result_register_for(x->type(), /*callee=*/true);                                                                   
1219     LIRItem result(x->result(), this);                                                                                               
1220 
1221     result.load_item_force(reg);                                                                                                     
1222     __ return_op(result.result());                                                                                                   
1223   }                                                                                                                                  
1224   set_no_result(x);                                                                                                                  
1225 }                                                                                                                                    
1226 
1227 // Examble: ref.get()                                                                                                                
1228 // Combination of LoadField and g1 pre-write barrier                                                                                 
1229 void LIRGenerator::do_Reference_get(Intrinsic* x) {                                                                                  
1230 
1231   const int referent_offset = java_lang_ref_Reference::referent_offset;                                                              
1232   guarantee(referent_offset > 0, "referent offset not initialized");                                                                 
1233 
1234   assert(x->number_of_arguments() == 1, "wrong type");                                                                               
1235 
1236   LIRItem reference(x->argument_at(0), this);                                                                                        
1237   reference.load_item();                                                                                                             
1238 
1239   // need to perform the null check on the reference objecy                                                                          
1240   CodeEmitInfo* info = NULL;                                                                                                         
1241   if (x->needs_null_check()) {                                                                                                       
1242     info = state_for(x);                                                                                                             
1243   }                                                                                                                                  
1244 
1245   LIR_Address* referent_field_adr =                                                                                                  
1246     new LIR_Address(reference.result(), referent_offset, T_OBJECT);                                                                  
1247 
1248   LIR_Opr result = rlock_result(x);                                                                                                  
1249 
1250   __ load(referent_field_adr, result, info);                                                                                         
1251 
1252   // Register the value in the referent field with the pre-barrier                                                                   
1253   pre_barrier(LIR_OprFact::illegalOpr /* addr_opr */,                                                                                
1254               result /* pre_val */,                                                                                                  
1255               false  /* do_load */,                                                                                                  
1256               false  /* patch */,                                                                                                    
1257               NULL   /* info */);                                                                                                    
1258 }                                                                                                                                    
1259 
1260 // Example: clazz.isInstance(object)                                                                                                 
1261 void LIRGenerator::do_isInstance(Intrinsic* x) {                                                                                     
1262   assert(x->number_of_arguments() == 2, "wrong type");                                                                               
1263 
1264   // TODO could try to substitute this node with an equivalent InstanceOf                                                            
1265   // if clazz is known to be a constant Class. This will pick up newly found                                                         
1266   // constants after HIR construction. I'll leave this to a future change.                                                           
1267 
1268   // as a first cut, make a simple leaf call to runtime to stay platform independent.                                                
1269   // could follow the aastore example in a future change.                                                                            
1270 
1271   LIRItem clazz(x->argument_at(0), this);                                                                                            
1272   LIRItem object(x->argument_at(1), this);                                                                                           
1273   clazz.load_item();                                                                                                                 
1274   object.load_item();                                                                                                                
1275   LIR_Opr result = rlock_result(x);                                                                                                  
1276 
1277   // need to perform null check on clazz                                                                                             
1278   if (x->needs_null_check()) {                                                                                                       
1279     CodeEmitInfo* info = state_for(x);                                                                                               
1280     __ null_check(clazz.result(), info);                                                                                             
1281   }                                                                                                                                  
1282 
1283   LIR_Opr call_result = call_runtime(clazz.value(), object.value(),                                                                  
1284                                      CAST_FROM_FN_PTR(address, Runtime1::is_instance_of),                                            
1285                                      x->type(),                                                                                      
1286                                      NULL); // NULL CodeEmitInfo results in a leaf call                                              
1287   __ move(call_result, result);                                                                                                      
1288 }                                                                                                                                    
1289 
1290 // Example: object.getClass ()                                                                                                       
1291 void LIRGenerator::do_getClass(Intrinsic* x) {                                                                                       
1292   assert(x->number_of_arguments() == 1, "wrong type");                                                                               
1293 
1294   LIRItem rcvr(x->argument_at(0), this);                                                                                             
1295   rcvr.load_item();                                                                                                                  
1296   LIR_Opr temp = new_register(T_METADATA);                                                                                           
1297   LIR_Opr result = rlock_result(x);                                                                                                  
1298 
1299   // need to perform the null check on the rcvr                                                                                      
1300   CodeEmitInfo* info = NULL;                                                                                                         
1301   if (x->needs_null_check()) {                                                                                                       
1302     info = state_for(x);                                                                                                             
1303   }                                                                                                                                  
1304 
1305   // FIXME T_ADDRESS should actually be T_METADATA but it can't because the                                                          
1306   // meaning of these two is mixed up (see JDK-8026837).                                                                             
1307   __ move(new LIR_Address(rcvr.result(), oopDesc::klass_offset_in_bytes(), T_ADDRESS), temp, info);                                  
1308   __ move_wide(new LIR_Address(temp, in_bytes(Klass::java_mirror_offset()), T_ADDRESS), result);                                     
1309   // mirror = ((OopHandle)mirror)->resolve();                                                                                        
1310   __ move_wide(new LIR_Address(result, T_OBJECT), result);                                                                           
1311 }                                                                                                                                    
1312 
1313 // java.lang.Class::isPrimitive()                                                                                                    
1314 void LIRGenerator::do_isPrimitive(Intrinsic* x) {                                                                                    
1315   assert(x->number_of_arguments() == 1, "wrong type");                                                                               
1316 
1317   LIRItem rcvr(x->argument_at(0), this);                                                                                             
1318   rcvr.load_item();                                                                                                                  
1319   LIR_Opr temp = new_register(T_METADATA);                                                                                           
1320   LIR_Opr result = rlock_result(x);                                                                                                  
1321 
1322   CodeEmitInfo* info = NULL;                                                                                                         
1323   if (x->needs_null_check()) {                                                                                                       
1324     info = state_for(x);                                                                                                             
1325   }                                                                                                                                  
1326 
1327   __ move(new LIR_Address(rcvr.result(), java_lang_Class::klass_offset_in_bytes(), T_ADDRESS), temp, info);                          
1328   __ cmp(lir_cond_notEqual, temp, LIR_OprFact::intConst(0));                                                                         
1329   __ cmove(lir_cond_notEqual, LIR_OprFact::intConst(0), LIR_OprFact::intConst(1), result, T_BOOLEAN);                                
1330 }                                                                                                                                    
1331 
1332 
1333 // Example: Thread.currentThread()                                                                                                   
1334 void LIRGenerator::do_currentThread(Intrinsic* x) {                                                                                  
1335   assert(x->number_of_arguments() == 0, "wrong type");                                                                               
1336   LIR_Opr reg = rlock_result(x);                                                                                                     
1337   __ move_wide(new LIR_Address(getThreadPointer(), in_bytes(JavaThread::threadObj_offset()), T_OBJECT), reg);                        
1338 }                                                                                                                                    
1339 
1340 
1341 void LIRGenerator::do_RegisterFinalizer(Intrinsic* x) {                                                                              
1342   assert(x->number_of_arguments() == 1, "wrong type");                                                                               
1343   LIRItem receiver(x->argument_at(0), this);                                                                                         
1344 
1345   receiver.load_item();                                                                                                              
1346   BasicTypeList signature;                                                                                                           
1347   signature.append(T_OBJECT); // receiver                                                                                            
1348   LIR_OprList* args = new LIR_OprList();                                                                                             
1349   args->append(receiver.result());                                                                                                   
1350   CodeEmitInfo* info = state_for(x, x->state());                                                                                     
1351   call_runtime(&signature, args,                                                                                                     
1352                CAST_FROM_FN_PTR(address, Runtime1::entry_for(Runtime1::register_finalizer_id)),                                      
1353                voidType, info);                                                                                                      
1354 
1355   set_no_result(x);                                                                                                                  
1356 }                                                                                                                                    
1357 
1358 
1359 //------------------------local access--------------------------------------                                                         
1360 
1361 LIR_Opr LIRGenerator::operand_for_instruction(Instruction* x) {                                                                      
1362   if (x->operand()->is_illegal()) {                                                                                                  
1363     Constant* c = x->as_Constant();                                                                                                  
1364     if (c != NULL) {                                                                                                                 
1365       x->set_operand(LIR_OprFact::value_type(c->type()));                                                                            
1366     } else {                                                                                                                         
1367       assert(x->as_Phi() || x->as_Local() != NULL, "only for Phi and Local");                                                        
1368       // allocate a virtual register for this local or phi                                                                           
1369       x->set_operand(rlock(x));                                                                                                      
1370       _instruction_for_operand.at_put_grow(x->operand()->vreg_number(), x, NULL);                                                    
1371     }                                                                                                                                
1372   }                                                                                                                                  
1373   return x->operand();                                                                                                               
1374 }                                                                                                                                    
1375 
1376 
1377 Instruction* LIRGenerator::instruction_for_opr(LIR_Opr opr) {                                                                        
1378   if (opr->is_virtual()) {                                                                                                           
1379     return instruction_for_vreg(opr->vreg_number());                                                                                 
1380   }                                                                                                                                  
1381   return NULL;                                                                                                                       
1382 }                                                                                                                                    
1383 
1384 
1385 Instruction* LIRGenerator::instruction_for_vreg(int reg_num) {                                                                       
1386   if (reg_num < _instruction_for_operand.length()) {                                                                                 
1387     return _instruction_for_operand.at(reg_num);                                                                                     
1388   }                                                                                                                                  
1389   return NULL;                                                                                                                       
1390 }                                                                                                                                    
1391 
1392 
1393 void LIRGenerator::set_vreg_flag(int vreg_num, VregFlag f) {                                                                         
1394   if (_vreg_flags.size_in_bits() == 0) {                                                                                             
1395     BitMap2D temp(100, num_vreg_flags);                                                                                              
1396     _vreg_flags = temp;                                                                                                              
1397   }                                                                                                                                  
1398   _vreg_flags.at_put_grow(vreg_num, f, true);                                                                                        
1399 }                                                                                                                                    
1400 
1401 bool LIRGenerator::is_vreg_flag_set(int vreg_num, VregFlag f) {                                                                      
1402   if (!_vreg_flags.is_valid_index(vreg_num, f)) {                                                                                    
1403     return false;                                                                                                                    
1404   }                                                                                                                                  
1405   return _vreg_flags.at(vreg_num, f);                                                                                                
1406 }                                                                                                                                    
1407 
1408 
1409 // Block local constant handling.  This code is useful for keeping                                                                   
1410 // unpinned constants and constants which aren't exposed in the IR in                                                                
1411 // registers.  Unpinned Constant instructions have their operands                                                                    
1412 // cleared when the block is finished so that other blocks can't end                                                                 
1413 // up referring to their registers.                                                                                                  
1414 
1415 LIR_Opr LIRGenerator::load_constant(Constant* x) {                                                                                   
1416   assert(!x->is_pinned(), "only for unpinned constants");                                                                            
1417   _unpinned_constants.append(x);                                                                                                     
1418   return load_constant(LIR_OprFact::value_type(x->type())->as_constant_ptr());                                                       
1419 }                                                                                                                                    
1420 
1421 
1422 LIR_Opr LIRGenerator::load_constant(LIR_Const* c) {                                                                                  
1423   BasicType t = c->type();                                                                                                           
1424   for (int i = 0; i < _constants.length(); i++) {                                                                                    
1425     LIR_Const* other = _constants.at(i);                                                                                             
1426     if (t == other->type()) {                                                                                                        
1427       switch (t) {                                                                                                                   
1428       case T_INT:                                                                                                                    
1429       case T_FLOAT:                                                                                                                  
1430         if (c->as_jint_bits() != other->as_jint_bits()) continue;                                                                    
1431         break;                                                                                                                       
1432       case T_LONG:                                                                                                                   
1433       case T_DOUBLE:                                                                                                                 
1434         if (c->as_jint_hi_bits() != other->as_jint_hi_bits()) continue;                                                              
1435         if (c->as_jint_lo_bits() != other->as_jint_lo_bits()) continue;                                                              
1436         break;                                                                                                                       
1437       case T_OBJECT:                                                                                                                 
1438         if (c->as_jobject() != other->as_jobject()) continue;                                                                        
1439         break;                                                                                                                       
1440       default:                                                                                                                       
1441         break;                                                                                                                       
1442       }                                                                                                                              
1443       return _reg_for_constants.at(i);                                                                                               
1444     }                                                                                                                                
1445   }                                                                                                                                  
1446 
1447   LIR_Opr result = new_register(t);                                                                                                  
1448   __ move((LIR_Opr)c, result);                                                                                                       
1449   _constants.append(c);                                                                                                              
1450   _reg_for_constants.append(result);                                                                                                 
1451   return result;                                                                                                                     
1452 }                                                                                                                                    
1453 
1454 // Various barriers                                                                                                                  
1455 
1456 void LIRGenerator::pre_barrier(LIR_Opr addr_opr, LIR_Opr pre_val,                                                                    
1457                                bool do_load, bool patch, CodeEmitInfo* info) {                                                       
1458   // Do the pre-write barrier, if any.                                                                                               
1459   switch (_bs->kind()) {                                                                                                             
1460 #if INCLUDE_ALL_GCS                                                                                                                  
1461     case BarrierSet::G1SATBCTLogging:                                                                                                
1462       G1SATBCardTableModRef_pre_barrier(addr_opr, pre_val, do_load, patch, info);                                                    
1463       break;                                                                                                                         
1464 #endif // INCLUDE_ALL_GCS                                                                                                            
1465     case BarrierSet::CardTableModRef:                                                                                                
1466       // No pre barriers                                                                                                             
1467       break;                                                                                                                         
1468     default      :                                                                                                                   
1469       ShouldNotReachHere();                                                                                                          
1470 
1471   }                                                                                                                                  
1472 }                                                                                                                                    
1473 
1474 void LIRGenerator::post_barrier(LIR_OprDesc* addr, LIR_OprDesc* new_val) {                                                           
1475   switch (_bs->kind()) {                                                                                                             
1476 #if INCLUDE_ALL_GCS                                                                                                                  
1477     case BarrierSet::G1SATBCTLogging:                                                                                                
1478       G1SATBCardTableModRef_post_barrier(addr,  new_val);                                                                            
1479       break;                                                                                                                         
1480 #endif // INCLUDE_ALL_GCS                                                                                                            
1481     case BarrierSet::CardTableModRef:                                                                                                
1482       CardTableModRef_post_barrier(addr,  new_val);                                                                                  
1483       break;                                                                                                                         
1484     default      :                                                                                                                   
1485       ShouldNotReachHere();                                                                                                          
1486     }                                                                                                                                
1487 }                                                                                                                                    
1488 
1489 ////////////////////////////////////////////////////////////////////////                                                             
1490 #if INCLUDE_ALL_GCS                                                                                                                  
1491 
1492 void LIRGenerator::G1SATBCardTableModRef_pre_barrier(LIR_Opr addr_opr, LIR_Opr pre_val,                                              
1493                                                      bool do_load, bool patch, CodeEmitInfo* info) {                                 
1494   // First we test whether marking is in progress.                                                                                   
1495   BasicType flag_type;                                                                                                               
1496   if (in_bytes(SATBMarkQueue::byte_width_of_active()) == 4) {                                                                        
1497     flag_type = T_INT;                                                                                                               
1498   } else {                                                                                                                           
1499     guarantee(in_bytes(SATBMarkQueue::byte_width_of_active()) == 1,                                                                  
1500               "Assumption");                                                                                                         
1501     // Use unsigned type T_BOOLEAN here rather than signed T_BYTE since some platforms, eg. ARM,                                     
1502     // need to use unsigned instructions to use the large offset to load the satb_mark_queue.                                        
1503     flag_type = T_BOOLEAN;                                                                                                           
1504   }                                                                                                                                  
1505   LIR_Opr thrd = getThreadPointer();                                                                                                 
1506   LIR_Address* mark_active_flag_addr =                                                                                               
1507     new LIR_Address(thrd,                                                                                                            
1508                     in_bytes(JavaThread::satb_mark_queue_offset() +                                                                  
1509                              SATBMarkQueue::byte_offset_of_active()),                                                                
1510                     flag_type);                                                                                                      
1511   // Read the marking-in-progress flag.                                                                                              
1512   LIR_Opr flag_val = new_register(T_INT);                                                                                            
1513   __ load(mark_active_flag_addr, flag_val);                                                                                          
1514   __ cmp(lir_cond_notEqual, flag_val, LIR_OprFact::intConst(0));                                                                     
1515 
1516   LIR_PatchCode pre_val_patch_code = lir_patch_none;                                                                                 
1517 
1518   CodeStub* slow;                                                                                                                    
1519 
1520   if (do_load) {                                                                                                                     
1521     assert(pre_val == LIR_OprFact::illegalOpr, "sanity");                                                                            
1522     assert(addr_opr != LIR_OprFact::illegalOpr, "sanity");                                                                           
1523 
1524     if (patch)                                                                                                                       
1525       pre_val_patch_code = lir_patch_normal;                                                                                         
1526 
1527     pre_val = new_register(T_OBJECT);                                                                                                
1528 
1529     if (!addr_opr->is_address()) {                                                                                                   
1530       assert(addr_opr->is_register(), "must be");                                                                                    
1531       addr_opr = LIR_OprFact::address(new LIR_Address(addr_opr, T_OBJECT));                                                          
1532     }                                                                                                                                
1533     slow = new G1PreBarrierStub(addr_opr, pre_val, pre_val_patch_code, info);                                                        
1534   } else {                                                                                                                           
1535     assert(addr_opr == LIR_OprFact::illegalOpr, "sanity");                                                                           
1536     assert(pre_val->is_register(), "must be");                                                                                       
1537     assert(pre_val->type() == T_OBJECT, "must be an object");                                                                        
1538     assert(info == NULL, "sanity");                                                                                                  
1539 
1540     slow = new G1PreBarrierStub(pre_val);                                                                                            
1541   }                                                                                                                                  
1542 
1543   __ branch(lir_cond_notEqual, T_INT, slow);                                                                                         
1544   __ branch_destination(slow->continuation());                                                                                       
1545 }                                                                                                                                    
1546 
1547 void LIRGenerator::G1SATBCardTableModRef_post_barrier(LIR_OprDesc* addr, LIR_OprDesc* new_val) {                                     
1548   // If the "new_val" is a constant NULL, no barrier is necessary.                                                                   
1549   if (new_val->is_constant() &&                                                                                                      
1550       new_val->as_constant_ptr()->as_jobject() == NULL) return;                                                                      
1551 
1552   if (!new_val->is_register()) {                                                                                                     
1553     LIR_Opr new_val_reg = new_register(T_OBJECT);                                                                                    
1554     if (new_val->is_constant()) {                                                                                                    
1555       __ move(new_val, new_val_reg);                                                                                                 
1556     } else {                                                                                                                         
1557       __ leal(new_val, new_val_reg);                                                                                                 
1558     }                                                                                                                                
1559     new_val = new_val_reg;                                                                                                           
1560   }                                                                                                                                  
1561   assert(new_val->is_register(), "must be a register at this point");                                                                
1562 
1563   if (addr->is_address()) {                                                                                                          
1564     LIR_Address* address = addr->as_address_ptr();                                                                                   
1565     LIR_Opr ptr = new_pointer_register();                                                                                            
1566     if (!address->index()->is_valid() && address->disp() == 0) {                                                                     
1567       __ move(address->base(), ptr);                                                                                                 
1568     } else {                                                                                                                         
1569       assert(address->disp() != max_jint, "lea doesn't support patched addresses!");                                                 
1570       __ leal(addr, ptr);                                                                                                            
1571     }                                                                                                                                
1572     addr = ptr;                                                                                                                      
1573   }                                                                                                                                  
1574   assert(addr->is_register(), "must be a register at this point");                                                                   
1575 
1576   LIR_Opr xor_res = new_pointer_register();                                                                                          
1577   LIR_Opr xor_shift_res = new_pointer_register();                                                                                    
1578   if (TwoOperandLIRForm ) {                                                                                                          
1579     __ move(addr, xor_res);                                                                                                          
1580     __ logical_xor(xor_res, new_val, xor_res);                                                                                       
1581     __ move(xor_res, xor_shift_res);                                                                                                 
1582     __ unsigned_shift_right(xor_shift_res,                                                                                           
1583                             LIR_OprFact::intConst(HeapRegion::LogOfHRGrainBytes),                                                    
1584                             xor_shift_res,                                                                                           
1585                             LIR_OprDesc::illegalOpr());                                                                              
1586   } else {                                                                                                                           
1587     __ logical_xor(addr, new_val, xor_res);                                                                                          
1588     __ unsigned_shift_right(xor_res,                                                                                                 
1589                             LIR_OprFact::intConst(HeapRegion::LogOfHRGrainBytes),                                                    
1590                             xor_shift_res,                                                                                           
1591                             LIR_OprDesc::illegalOpr());                                                                              
1592   }                                                                                                                                  
1593 
1594   if (!new_val->is_register()) {                                                                                                     
1595     LIR_Opr new_val_reg = new_register(T_OBJECT);                                                                                    
1596     __ leal(new_val, new_val_reg);                                                                                                   
1597     new_val = new_val_reg;                                                                                                           
1598   }                                                                                                                                  
1599   assert(new_val->is_register(), "must be a register at this point");                                                                
1600 
1601   __ cmp(lir_cond_notEqual, xor_shift_res, LIR_OprFact::intptrConst(NULL_WORD));                                                     
1602 
1603   CodeStub* slow = new G1PostBarrierStub(addr, new_val);                                                                             
1604   __ branch(lir_cond_notEqual, LP64_ONLY(T_LONG) NOT_LP64(T_INT), slow);                                                             
1605   __ branch_destination(slow->continuation());                                                                                       
1606 }                                                                                                                                    
1607 
1608 #endif // INCLUDE_ALL_GCS                                                                                                            
1609 ////////////////////////////////////////////////////////////////////////                                                             
1610 
1611 void LIRGenerator::CardTableModRef_post_barrier(LIR_OprDesc* addr, LIR_OprDesc* new_val) {                                           
1612   LIR_Const* card_table_base = new LIR_Const(ci_card_table_address());                                                               
1613   if (addr->is_address()) {                                                                                                          
1614     LIR_Address* address = addr->as_address_ptr();                                                                                   
1615     // ptr cannot be an object because we use this barrier for array card marks                                                      
1616     // and addr can point in the middle of an array.                                                                                 
1617     LIR_Opr ptr = new_pointer_register();                                                                                            
1618     if (!address->index()->is_valid() && address->disp() == 0) {                                                                     
1619       __ move(address->base(), ptr);                                                                                                 
1620     } else {                                                                                                                         
1621       assert(address->disp() != max_jint, "lea doesn't support patched addresses!");                                                 
1622       __ leal(addr, ptr);                                                                                                            
1623     }                                                                                                                                
1624     addr = ptr;                                                                                                                      
1625   }                                                                                                                                  
1626   assert(addr->is_register(), "must be a register at this point");                                                                   
1627 
1628 #ifdef CARDTABLEMODREF_POST_BARRIER_HELPER                                                                                           
1629   CardTableModRef_post_barrier_helper(addr, card_table_base);                                                                        
1630 #else                                                                                                                                
1631   LIR_Opr tmp = new_pointer_register();                                                                                              
1632   if (TwoOperandLIRForm) {                                                                                                           
1633     __ move(addr, tmp);                                                                                                              
1634     __ unsigned_shift_right(tmp, CardTable::card_shift, tmp);                                                                        
1635   } else {                                                                                                                           
1636     __ unsigned_shift_right(addr, CardTable::card_shift, tmp);                                                                       
1637   }                                                                                                                                  
1638 
1639   LIR_Address* card_addr;                                                                                                            
1640   if (can_inline_as_constant(card_table_base)) {                                                                                     
1641     card_addr = new LIR_Address(tmp, card_table_base->as_jint(), T_BYTE);                                                            
1642   } else {                                                                                                                           
1643     card_addr = new LIR_Address(tmp, load_constant(card_table_base), T_BYTE);                                                        
1644   }                                                                                                                                  
1645 
1646   LIR_Opr dirty = LIR_OprFact::intConst(CardTable::dirty_card_val());                                                                
1647   if (UseCondCardMark) {                                                                                                             
1648     LIR_Opr cur_value = new_register(T_INT);                                                                                         
1649     if (UseConcMarkSweepGC) {                                                                                                        
1650       __ membar_storeload();                                                                                                         
1651     }                                                                                                                                
1652     __ move(card_addr, cur_value);                                                                                                   
1653 
1654     LabelObj* L_already_dirty = new LabelObj();                                                                                      
1655     __ cmp(lir_cond_equal, cur_value, dirty);                                                                                        
1656     __ branch(lir_cond_equal, T_BYTE, L_already_dirty->label());                                                                     
1657     __ move(dirty, card_addr);                                                                                                       
1658     __ branch_destination(L_already_dirty->label());                                                                                 
1659   } else {                                                                                                                           
1660     if (UseConcMarkSweepGC && CMSPrecleaningEnabled) {                                                                               
1661       __ membar_storestore();                                                                                                        
1662     }                                                                                                                                
1663     __ move(dirty, card_addr);                                                                                                       
1664   }                                                                                                                                  
1665 #endif                                                                                                                               
1666 }                                                                                                                                    
1667 
1668 
1669 //------------------------field access--------------------------------------                                                         
1670 
1671 // Comment copied form templateTable_i486.cpp                                                                                        
1672 // ----------------------------------------------------------------------------                                                      
1673 // Volatile variables demand their effects be made known to all CPU's in                                                             
1674 // order.  Store buffers on most chips allow reads & writes to reorder; the                                                          
1675 // JMM's ReadAfterWrite.java test fails in -Xint mode without some kind of                                                           
1676 // memory barrier (i.e., it's not sufficient that the interpreter does not                                                           
1677 // reorder volatile references, the hardware also must not reorder them).                                                            
1678 //                                                                                                                                   
1679 // According to the new Java Memory Model (JMM):                                                                                     
1680 // (1) All volatiles are serialized wrt to each other.                                                                               
1681 // ALSO reads & writes act as aquire & release, so:                                                                                  
1682 // (2) A read cannot let unrelated NON-volatile memory refs that happen after                                                        
1683 // the read float up to before the read.  It's OK for non-volatile memory refs                                                       
1684 // that happen before the volatile read to float down below it.                                                                      
1685 // (3) Similar a volatile write cannot let unrelated NON-volatile memory refs                                                        
1686 // that happen BEFORE the write float down to after the write.  It's OK for                                                          
1687 // non-volatile memory refs that happen after the volatile write to float up                                                         
1688 // before it.                                                                                                                        
1689 //                                                                                                                                   
1690 // We only put in barriers around volatile refs (they are expensive), not                                                            
1691 // _between_ memory refs (that would require us to track the flavor of the                                                           
1692 // previous memory refs).  Requirements (2) and (3) require some barriers                                                            
1693 // before volatile stores and after volatile loads.  These nearly cover                                                              
1694 // requirement (1) but miss the volatile-store-volatile-load case.  This final                                                       
1695 // case is placed after volatile-stores although it could just as well go                                                            
1696 // before volatile-loads.                                                                                                            
1697 
1698 
1699 void LIRGenerator::do_StoreField(StoreField* x) {                                                                                    
1700   bool needs_patching = x->needs_patching();                                                                                         
1701   bool is_volatile = x->field()->is_volatile();                                                                                      
1702   BasicType field_type = x->field_type();                                                                                            
1703   bool is_oop = (field_type == T_ARRAY || field_type == T_OBJECT);                                                                   
1704 
1705   CodeEmitInfo* info = NULL;                                                                                                         
1706   if (needs_patching) {                                                                                                              
1707     assert(x->explicit_null_check() == NULL, "can't fold null check into patching field access");                                    
1708     info = state_for(x, x->state_before());                                                                                          
1709   } else if (x->needs_null_check()) {                                                                                                
1710     NullCheck* nc = x->explicit_null_check();                                                                                        
1711     if (nc == NULL) {                                                                                                                
1712       info = state_for(x);                                                                                                           
1713     } else {                                                                                                                         
1714       info = state_for(nc);                                                                                                          
1715     }                                                                                                                                
1716   }                                                                                                                                  
1717 
1718 
1719   LIRItem object(x->obj(), this);                                                                                                    
1720   LIRItem value(x->value(),  this);                                                                                                  
1721 
1722   object.load_item();                                                                                                                
1723 
1724   if (is_volatile || needs_patching) {                                                                                               
1725     // load item if field is volatile (fewer special cases for volatiles)                                                            
1726     // load item if field not initialized                                                                                            
1727     // load item if field not constant                                                                                               
1728     // because of code patching we cannot inline constants                                                                           
1729     if (field_type == T_BYTE || field_type == T_BOOLEAN) {                                                                           
1730       value.load_byte_item();                                                                                                        
1731     } else  {                                                                                                                        
1732       value.load_item();                                                                                                             
1733     }                                                                                                                                
1734   } else {                                                                                                                           
1735     value.load_for_store(field_type);                                                                                                
1736   }                                                                                                                                  
1737 
1738   set_no_result(x);                                                                                                                  
1739 
1740 #ifndef PRODUCT                                                                                                                      
1741   if (PrintNotLoaded && needs_patching) {                                                                                            
1742     tty->print_cr("   ###class not loaded at store_%s bci %d",                                                                       
1743                   x->is_static() ?  "static" : "field", x->printable_bci());                                                         
1744   }                                                                                                                                  
1745 #endif                                                                                                                               
1746 
1747   if (x->needs_null_check() &&                                                                                                       
1748       (needs_patching ||                                                                                                             
1749        MacroAssembler::needs_explicit_null_check(x->offset()))) {                                                                    
1750     // Emit an explicit null check because the offset is too large.                                                                  
1751     // If the class is not loaded and the object is NULL, we need to deoptimize to throw a                                           
1752     // NoClassDefFoundError in the interpreter instead of an implicit NPE from compiled code.                                        
1753     __ null_check(object.result(), new CodeEmitInfo(info), /* deoptimize */ needs_patching);                                         
1754   }                                                                                                                                  
1755 
1756   LIR_Address* address;                                                                                                              
1757   if (needs_patching) {                                                                                                              
1758     // we need to patch the offset in the instruction so don't allow                                                                 
1759     // generate_address to try to be smart about emitting the -1.                                                                    
1760     // Otherwise the patching code won't know how to find the                                                                        
1761     // instruction to patch.                                                                                                         
1762     address = new LIR_Address(object.result(), PATCHED_ADDR, field_type);                                                            
1763   } else {                                                                                                                           
1764     address = generate_address(object.result(), x->offset(), field_type);                                                            
1765   }                                                                                                                                  
1766 
1767   if (is_volatile && os::is_MP()) {                                                                                                  
1768     __ membar_release();                                                                                                             
1769   }                                                                                                                                  
1770 
1771   if (is_oop) {                                                                                                                      
1772     // Do the pre-write barrier, if any.                                                                                             
1773     pre_barrier(LIR_OprFact::address(address),                                                                                       
1774                 LIR_OprFact::illegalOpr /* pre_val */,                                                                               
1775                 true /* do_load*/,                                                                                                   
1776                 needs_patching,                                                                                                      
1777                 (info ? new CodeEmitInfo(info) : NULL));                                                                             
1778   }                                                                                                                                  
1779 
1780   bool needs_atomic_access = is_volatile || AlwaysAtomicAccesses;                                                                    
1781   if (needs_atomic_access && !needs_patching) {                                                                                      
1782     volatile_field_store(value.result(), address, info);                                                                             
1783   } else {                                                                                                                           
1784     LIR_PatchCode patch_code = needs_patching ? lir_patch_normal : lir_patch_none;                                                   
1785     __ store(value.result(), address, info, patch_code);                                                                             
1786   }                                                                                                                                  
1787 
1788   if (is_oop) {                                                                                                                      
1789     // Store to object so mark the card of the header                                                                                
1790     post_barrier(object.result(), value.result());                                                                                   
1791   }                                                                                                                                  
1792 
1793   if (!support_IRIW_for_not_multiple_copy_atomic_cpu && is_volatile && os::is_MP()) {                                                
1794     __ membar();                                                                                                                     
1795   }                                                                                                                                  
1796 }                                                                                                                                    
1797 
1798 
1799 void LIRGenerator::do_LoadField(LoadField* x) {                                                                                      
1800   bool needs_patching = x->needs_patching();                                                                                         
1801   bool is_volatile = x->field()->is_volatile();                                                                                      
1802   BasicType field_type = x->field_type();                                                                                            
1803 
1804   CodeEmitInfo* info = NULL;                                                                                                         
1805   if (needs_patching) {                                                                                                              
1806     assert(x->explicit_null_check() == NULL, "can't fold null check into patching field access");                                    
1807     info = state_for(x, x->state_before());                                                                                          
1808   } else if (x->needs_null_check()) {                                                                                                
1809     NullCheck* nc = x->explicit_null_check();                                                                                        
1810     if (nc == NULL) {                                                                                                                
1811       info = state_for(x);                                                                                                           
1812     } else {                                                                                                                         
1813       info = state_for(nc);                                                                                                          
1814     }                                                                                                                                
1815   }                                                                                                                                  
1816 
1817   LIRItem object(x->obj(), this);                                                                                                    
1818 
1819   object.load_item();                                                                                                                
1820 
1821 #ifndef PRODUCT                                                                                                                      
1822   if (PrintNotLoaded && needs_patching) {                                                                                            
1823     tty->print_cr("   ###class not loaded at load_%s bci %d",                                                                        
1824                   x->is_static() ?  "static" : "field", x->printable_bci());                                                         
1825   }                                                                                                                                  
1826 #endif                                                                                                                               
1827 
1828   bool stress_deopt = StressLoopInvariantCodeMotion && info && info->deoptimize_on_exception();                                      
1829   if (x->needs_null_check() &&                                                                                                       
1830       (needs_patching ||                                                                                                             
1831        MacroAssembler::needs_explicit_null_check(x->offset()) ||                                                                     
1832        stress_deopt)) {                                                                                                              
1833     LIR_Opr obj = object.result();                                                                                                   
1834     if (stress_deopt) {                                                                                                              
1835       obj = new_register(T_OBJECT);                                                                                                  
1836       __ move(LIR_OprFact::oopConst(NULL), obj);                                                                                     
1837     }                                                                                                                                
1838     // Emit an explicit null check because the offset is too large.                                                                  
1839     // If the class is not loaded and the object is NULL, we need to deoptimize to throw a                                           
1840     // NoClassDefFoundError in the interpreter instead of an implicit NPE from compiled code.                                        
1841     __ null_check(obj, new CodeEmitInfo(info), /* deoptimize */ needs_patching);                                                     
1842   }                                                                                                                                  
1843 
1844   LIR_Opr reg = rlock_result(x, field_type);                                                                                         
1845   LIR_Address* address;                                                                                                              
1846   if (needs_patching) {                                                                                                              
1847     // we need to patch the offset in the instruction so don't allow                                                                 
1848     // generate_address to try to be smart about emitting the -1.                                                                    
1849     // Otherwise the patching code won't know how to find the                                                                        
1850     // instruction to patch.                                                                                                         
1851     address = new LIR_Address(object.result(), PATCHED_ADDR, field_type);                                                            
1852   } else {                                                                                                                           
1853     address = generate_address(object.result(), x->offset(), field_type);                                                            
1854   }                                                                                                                                  
1855 
1856   if (support_IRIW_for_not_multiple_copy_atomic_cpu && is_volatile && os::is_MP()) {                                                 
1857     __ membar();                                                                                                                     
1858   }                                                                                                                                  
1859 
1860   bool needs_atomic_access = is_volatile || AlwaysAtomicAccesses;                                                                    
1861   if (needs_atomic_access && !needs_patching) {                                                                                      
1862     volatile_field_load(address, reg, info);                                                                                         
1863   } else {                                                                                                                           
1864     LIR_PatchCode patch_code = needs_patching ? lir_patch_normal : lir_patch_none;                                                   
1865     __ load(address, reg, info, patch_code);                                                                                         
1866   }                                                                                                                                  
1867 
1868   if (is_volatile && os::is_MP()) {                                                                                                  
1869     __ membar_acquire();                                                                                                             
1870   }                                                                                                                                  
1871 }                                                                                                                                    
1872 
1873 
1874 //------------------------java.nio.Buffer.checkIndex------------------------                                                         
1875 
1876 // int java.nio.Buffer.checkIndex(int)                                                                                               
1877 void LIRGenerator::do_NIOCheckIndex(Intrinsic* x) {                                                                                  
1878   // NOTE: by the time we are in checkIndex() we are guaranteed that                                                                 
1879   // the buffer is non-null (because checkIndex is package-private and                                                               
1880   // only called from within other methods in the buffer).                                                                           
1881   assert(x->number_of_arguments() == 2, "wrong type");                                                                               
1882   LIRItem buf  (x->argument_at(0), this);                                                                                            
1883   LIRItem index(x->argument_at(1), this);                                                                                            
1884   buf.load_item();                                                                                                                   
1885   index.load_item();                                                                                                                 
1886 
1887   LIR_Opr result = rlock_result(x);                                                                                                  
1888   if (GenerateRangeChecks) {                                                                                                         
1889     CodeEmitInfo* info = state_for(x);                                                                                               
1890     CodeStub* stub = new RangeCheckStub(info, index.result(), true);                                                                 
1891     if (index.result()->is_constant()) {                                                                                             
1892       cmp_mem_int(lir_cond_belowEqual, buf.result(), java_nio_Buffer::limit_offset(), index.result()->as_jint(), info);              
1893       __ branch(lir_cond_belowEqual, T_INT, stub);                                                                                   
1894     } else {                                                                                                                         
1895       cmp_reg_mem(lir_cond_aboveEqual, index.result(), buf.result(),                                                                 
1896                   java_nio_Buffer::limit_offset(), T_INT, info);                                                                     
1897       __ branch(lir_cond_aboveEqual, T_INT, stub);                                                                                   
1898     }                                                                                                                                
1899     __ move(index.result(), result);                                                                                                 
1900   } else {                                                                                                                           
1901     // Just load the index into the result register                                                                                  
1902     __ move(index.result(), result);                                                                                                 
1903   }                                                                                                                                  
1904 }                                                                                                                                    
1905 
1906 
1907 //------------------------array access--------------------------------------                                                         
1908 
1909 
1910 void LIRGenerator::do_ArrayLength(ArrayLength* x) {                                                                                  
1911   LIRItem array(x->array(), this);                                                                                                   
1912   array.load_item();                                                                                                                 
1913   LIR_Opr reg = rlock_result(x);                                                                                                     
1914 
1915   CodeEmitInfo* info = NULL;                                                                                                         
1916   if (x->needs_null_check()) {                                                                                                       
1917     NullCheck* nc = x->explicit_null_check();                                                                                        
1918     if (nc == NULL) {                                                                                                                
1919       info = state_for(x);                                                                                                           
1920     } else {                                                                                                                         
1921       info = state_for(nc);                                                                                                          
1922     }                                                                                                                                
1923     if (StressLoopInvariantCodeMotion && info->deoptimize_on_exception()) {                                                          
1924       LIR_Opr obj = new_register(T_OBJECT);                                                                                          
1925       __ move(LIR_OprFact::oopConst(NULL), obj);                                                                                     
1926       __ null_check(obj, new CodeEmitInfo(info));                                                                                    
1927     }                                                                                                                                
1928   }                                                                                                                                  
1929   __ load(new LIR_Address(array.result(), arrayOopDesc::length_offset_in_bytes(), T_INT), reg, info, lir_patch_none);                
1930 }                                                                                                                                    
1931 
1932 
1933 void LIRGenerator::do_LoadIndexed(LoadIndexed* x) {                                                                                  
1934   bool use_length = x->length() != NULL;                                                                                             
1935   LIRItem array(x->array(), this);                                                                                                   
1936   LIRItem index(x->index(), this);                                                                                                   
1937   LIRItem length(this);                                                                                                              
1938   bool needs_range_check = x->compute_needs_range_check();                                                                           
1939 
1940   if (use_length && needs_range_check) {                                                                                             
1941     length.set_instruction(x->length());                                                                                             
1942     length.load_item();                                                                                                              
1943   }                                                                                                                                  
1944 
1945   array.load_item();                                                                                                                 
1946   if (index.is_constant() && can_inline_as_constant(x->index())) {                                                                   
1947     // let it be a constant                                                                                                          
1948     index.dont_load_item();                                                                                                          
1949   } else {                                                                                                                           
1950     index.load_item();                                                                                                               
1951   }                                                                                                                                  
1952 
1953   CodeEmitInfo* range_check_info = state_for(x);                                                                                     
1954   CodeEmitInfo* null_check_info = NULL;                                                                                              
1955   if (x->needs_null_check()) {                                                                                                       
1956     NullCheck* nc = x->explicit_null_check();                                                                                        
1957     if (nc != NULL) {                                                                                                                
1958       null_check_info = state_for(nc);                                                                                               
1959     } else {                                                                                                                         
1960       null_check_info = range_check_info;                                                                                            
1961     }                                                                                                                                
1962     if (StressLoopInvariantCodeMotion && null_check_info->deoptimize_on_exception()) {                                               
1963       LIR_Opr obj = new_register(T_OBJECT);                                                                                          
1964       __ move(LIR_OprFact::oopConst(NULL), obj);                                                                                     
1965       __ null_check(obj, new CodeEmitInfo(null_check_info));                                                                         
1966     }                                                                                                                                
1967   }                                                                                                                                  
1968 
1969   // emit array address setup early so it schedules better                                                                           
1970   LIR_Address* array_addr = emit_array_address(array.result(), index.result(), x->elt_type(), false);                                
1971 
1972   if (GenerateRangeChecks && needs_range_check) {                                                                                    
1973     if (StressLoopInvariantCodeMotion && range_check_info->deoptimize_on_exception()) {                                              
1974       __ branch(lir_cond_always, T_ILLEGAL, new RangeCheckStub(range_check_info, index.result()));                                   
1975     } else if (use_length) {                                                                                                         
1976       // TODO: use a (modified) version of array_range_check that does not require a                                                 
1977       //       constant length to be loaded to a register                                                                            
1978       __ cmp(lir_cond_belowEqual, length.result(), index.result());                                                                  
1979       __ branch(lir_cond_belowEqual, T_INT, new RangeCheckStub(range_check_info, index.result()));                                   
1980     } else {                                                                                                                         
1981       array_range_check(array.result(), index.result(), null_check_info, range_check_info);                                          
1982       // The range check performs the null check, so clear it out for the load                                                       
1983       null_check_info = NULL;                                                                                                        
1984     }                                                                                                                                
1985   }                                                                                                                                  
1986 
1987   __ move(array_addr, rlock_result(x, x->elt_type()), null_check_info);                                                              
1988 }                                                                                                                                    
1989 
1990 
1991 void LIRGenerator::do_NullCheck(NullCheck* x) {                                                                                      
1992   if (x->can_trap()) {                                                                                                               
1993     LIRItem value(x->obj(), this);                                                                                                   
1994     value.load_item();                                                                                                               
1995     CodeEmitInfo* info = state_for(x);                                                                                               
1996     __ null_check(value.result(), info);                                                                                             
1997   }                                                                                                                                  
1998 }                                                                                                                                    
1999 
2000 
2001 void LIRGenerator::do_TypeCast(TypeCast* x) {                                                                                        
2002   LIRItem value(x->obj(), this);                                                                                                     
2003   value.load_item();                                                                                                                 
2004   // the result is the same as from the node we are casting                                                                          
2005   set_result(x, value.result());                                                                                                     
2006 }                                                                                                                                    
2007 
2008 
2009 void LIRGenerator::do_Throw(Throw* x) {                                                                                              
2010   LIRItem exception(x->exception(), this);                                                                                           
2011   exception.load_item();                                                                                                             
2012   set_no_result(x);                                                                                                                  
2013   LIR_Opr exception_opr = exception.result();                                                                                        
2014   CodeEmitInfo* info = state_for(x, x->state());                                                                                     
2015 
2016 #ifndef PRODUCT                                                                                                                      
2017   if (PrintC1Statistics) {                                                                                                           
2018     increment_counter(Runtime1::throw_count_address(), T_INT);                                                                       
2019   }                                                                                                                                  
2020 #endif                                                                                                                               
2021 
2022   // check if the instruction has an xhandler in any of the nested scopes                                                            
2023   bool unwind = false;                                                                                                               
2024   if (info->exception_handlers()->length() == 0) {                                                                                   
2025     // this throw is not inside an xhandler                                                                                          
2026     unwind = true;                                                                                                                   
2027   } else {                                                                                                                           
2028     // get some idea of the throw type                                                                                               
2029     bool type_is_exact = true;                                                                                                       
2030     ciType* throw_type = x->exception()->exact_type();                                                                               
2031     if (throw_type == NULL) {                                                                                                        
2032       type_is_exact = false;                                                                                                         
2033       throw_type = x->exception()->declared_type();                                                                                  
2034     }                                                                                                                                
2035     if (throw_type != NULL && throw_type->is_instance_klass()) {                                                                     
2036       ciInstanceKlass* throw_klass = (ciInstanceKlass*)throw_type;                                                                   
2037       unwind = !x->exception_handlers()->could_catch(throw_klass, type_is_exact);                                                    
2038     }                                                                                                                                
2039   }                                                                                                                                  
2040 
2041   // do null check before moving exception oop into fixed register                                                                   
2042   // to avoid a fixed interval with an oop during the null check.                                                                    
2043   // Use a copy of the CodeEmitInfo because debug information is                                                                     
2044   // different for null_check and throw.                                                                                             
2045   if (x->exception()->as_NewInstance() == NULL && x->exception()->as_ExceptionObject() == NULL) {                                    
2046     // if the exception object wasn't created using new then it might be null.                                                       
2047     __ null_check(exception_opr, new CodeEmitInfo(info, x->state()->copy(ValueStack::ExceptionState, x->state()->bci())));           
2048   }                                                                                                                                  
2049 
2050   if (compilation()->env()->jvmti_can_post_on_exceptions()) {                                                                        
2051     // we need to go through the exception lookup path to get JVMTI                                                                  
2052     // notification done                                                                                                             
2053     unwind = false;                                                                                                                  
2054   }                                                                                                                                  
2055 
2056   // move exception oop into fixed register                                                                                          
2057   __ move(exception_opr, exceptionOopOpr());                                                                                         
2058 
2059   if (unwind) {                                                                                                                      
2060     __ unwind_exception(exceptionOopOpr());                                                                                          
2061   } else {                                                                                                                           
2062     __ throw_exception(exceptionPcOpr(), exceptionOopOpr(), info);                                                                   
2063   }                                                                                                                                  
2064 }                                                                                                                                    
2065 
2066 
2067 void LIRGenerator::do_RoundFP(RoundFP* x) {                                                                                          
2068   LIRItem input(x->input(), this);                                                                                                   
2069   input.load_item();                                                                                                                 
2070   LIR_Opr input_opr = input.result();                                                                                                
2071   assert(input_opr->is_register(), "why round if value is not in a register?");                                                      
2072   assert(input_opr->is_single_fpu() || input_opr->is_double_fpu(), "input should be floating-point value");                          
2073   if (input_opr->is_single_fpu()) {                                                                                                  
2074     set_result(x, round_item(input_opr)); // This code path not currently taken                                                      
2075   } else {                                                                                                                           
2076     LIR_Opr result = new_register(T_DOUBLE);                                                                                         
2077     set_vreg_flag(result, must_start_in_memory);                                                                                     
2078     __ roundfp(input_opr, LIR_OprFact::illegalOpr, result);                                                                          
2079     set_result(x, result);                                                                                                           
2080   }                                                                                                                                  
2081 }                                                                                                                                    
2082 
2083 // Here UnsafeGetRaw may have x->base() and x->index() be int or long                                                                
2084 // on both 64 and 32 bits. Expecting x->base() to be always long on 64bit.                                                           
2085 void LIRGenerator::do_UnsafeGetRaw(UnsafeGetRaw* x) {                                                                                
2086   LIRItem base(x->base(), this);                                                                                                     
2087   LIRItem idx(this);                                                                                                                 
2088 
2089   base.load_item();                                                                                                                  
2090   if (x->has_index()) {                                                                                                              
2091     idx.set_instruction(x->index());                                                                                                 
2092     idx.load_nonconstant();                                                                                                          
2093   }                                                                                                                                  
2094 
2095   LIR_Opr reg = rlock_result(x, x->basic_type());                                                                                    
2096 
2097   int   log2_scale = 0;                                                                                                              
2098   if (x->has_index()) {                                                                                                              
2099     log2_scale = x->log2_scale();                                                                                                    
2100   }                                                                                                                                  
2101 
2102   assert(!x->has_index() || idx.value() == x->index(), "should match");                                                              
2103 
2104   LIR_Opr base_op = base.result();                                                                                                   
2105   LIR_Opr index_op = idx.result();                                                                                                   
2106 #ifndef _LP64                                                                                                                        
2107   if (base_op->type() == T_LONG) {                                                                                                   
2108     base_op = new_register(T_INT);                                                                                                   
2109     __ convert(Bytecodes::_l2i, base.result(), base_op);                                                                             
2110   }                                                                                                                                  
2111   if (x->has_index()) {                                                                                                              
2112     if (index_op->type() == T_LONG) {                                                                                                
2113       LIR_Opr long_index_op = index_op;                                                                                              
2114       if (index_op->is_constant()) {                                                                                                 
2115         long_index_op = new_register(T_LONG);                                                                                        
2116         __ move(index_op, long_index_op);                                                                                            
2117       }                                                                                                                              
2118       index_op = new_register(T_INT);                                                                                                
2119       __ convert(Bytecodes::_l2i, long_index_op, index_op);                                                                          
2120     } else {                                                                                                                         
2121       assert(x->index()->type()->tag() == intTag, "must be");                                                                        
2122     }                                                                                                                                
2123   }                                                                                                                                  
2124   // At this point base and index should be all ints.                                                                                
2125   assert(base_op->type() == T_INT && !base_op->is_constant(), "base should be an non-constant int");                                 
2126   assert(!x->has_index() || index_op->type() == T_INT, "index should be an int");                                                    
2127 #else                                                                                                                                
2128   if (x->has_index()) {                                                                                                              
2129     if (index_op->type() == T_INT) {                                                                                                 
2130       if (!index_op->is_constant()) {                                                                                                
2131         index_op = new_register(T_LONG);                                                                                             
2132         __ convert(Bytecodes::_i2l, idx.result(), index_op);                                                                         
2133       }                                                                                                                              
2134     } else {                                                                                                                         
2135       assert(index_op->type() == T_LONG, "must be");                                                                                 
2136       if (index_op->is_constant()) {                                                                                                 
2137         index_op = new_register(T_LONG);                                                                                             
2138         __ move(idx.result(), index_op);                                                                                             
2139       }                                                                                                                              
2140     }                                                                                                                                
2141   }                                                                                                                                  
2142   // At this point base is a long non-constant                                                                                       
2143   // Index is a long register or a int constant.                                                                                     
2144   // We allow the constant to stay an int because that would allow us a more compact encoding by                                     
2145   // embedding an immediate offset in the address expression. If we have a long constant, we have to                                 
2146   // move it into a register first.                                                                                                  
2147   assert(base_op->type() == T_LONG && !base_op->is_constant(), "base must be a long non-constant");                                  
2148   assert(!x->has_index() || (index_op->type() == T_INT && index_op->is_constant()) ||                                                
2149                             (index_op->type() == T_LONG && !index_op->is_constant()), "unexpected index type");                      
2150 #endif                                                                                                                               
2151 
2152   BasicType dst_type = x->basic_type();                                                                                              
2153 
2154   LIR_Address* addr;                                                                                                                 
2155   if (index_op->is_constant()) {                                                                                                     
2156     assert(log2_scale == 0, "must not have a scale");                                                                                
2157     assert(index_op->type() == T_INT, "only int constants supported");                                                               
2158     addr = new LIR_Address(base_op, index_op->as_jint(), dst_type);                                                                  
2159   } else {                                                                                                                           
2160 #ifdef X86                                                                                                                           
2161     addr = new LIR_Address(base_op, index_op, LIR_Address::Scale(log2_scale), 0, dst_type);                                          
2162 #elif defined(GENERATE_ADDRESS_IS_PREFERRED)                                                                                         
2163     addr = generate_address(base_op, index_op, log2_scale, 0, dst_type);                                                             
2164 #else                                                                                                                                
2165     if (index_op->is_illegal() || log2_scale == 0) {                                                                                 
2166       addr = new LIR_Address(base_op, index_op, dst_type);                                                                           
2167     } else {                                                                                                                         
2168       LIR_Opr tmp = new_pointer_register();                                                                                          
2169       __ shift_left(index_op, log2_scale, tmp);                                                                                      
2170       addr = new LIR_Address(base_op, tmp, dst_type);                                                                                
2171     }                                                                                                                                
2172 #endif                                                                                                                               
2173   }                                                                                                                                  
2174 
2175   if (x->may_be_unaligned() && (dst_type == T_LONG || dst_type == T_DOUBLE)) {                                                       
2176     __ unaligned_move(addr, reg);                                                                                                    
2177   } else {                                                                                                                           
2178     if (dst_type == T_OBJECT && x->is_wide()) {                                                                                      
2179       __ move_wide(addr, reg);                                                                                                       
2180     } else {                                                                                                                         
2181       __ move(addr, reg);                                                                                                            
2182     }                                                                                                                                
2183   }                                                                                                                                  
2184 }                                                                                                                                    
2185 
2186 
2187 void LIRGenerator::do_UnsafePutRaw(UnsafePutRaw* x) {                                                                                
2188   int  log2_scale = 0;                                                                                                               
2189   BasicType type = x->basic_type();                                                                                                  
2190 
2191   if (x->has_index()) {                                                                                                              
2192     log2_scale = x->log2_scale();                                                                                                    
2193   }                                                                                                                                  
2194 
2195   LIRItem base(x->base(), this);                                                                                                     
2196   LIRItem value(x->value(), this);                                                                                                   
2197   LIRItem idx(this);                                                                                                                 
2198 
2199   base.load_item();                                                                                                                  
2200   if (x->has_index()) {                                                                                                              
2201     idx.set_instruction(x->index());                                                                                                 
2202     idx.load_item();                                                                                                                 
2203   }                                                                                                                                  
2204 
2205   if (type == T_BYTE || type == T_BOOLEAN) {                                                                                         
2206     value.load_byte_item();                                                                                                          
2207   } else {                                                                                                                           
2208     value.load_item();                                                                                                               
2209   }                                                                                                                                  
2210 
2211   set_no_result(x);                                                                                                                  
2212 
2213   LIR_Opr base_op = base.result();                                                                                                   
2214   LIR_Opr index_op = idx.result();                                                                                                   
2215 
2216 #ifdef GENERATE_ADDRESS_IS_PREFERRED                                                                                                 
2217   LIR_Address* addr = generate_address(base_op, index_op, log2_scale, 0, x->basic_type());                                           
2218 #else                                                                                                                                
2219 #ifndef _LP64                                                                                                                        
2220   if (base_op->type() == T_LONG) {                                                                                                   
2221     base_op = new_register(T_INT);                                                                                                   
2222     __ convert(Bytecodes::_l2i, base.result(), base_op);                                                                             
2223   }                                                                                                                                  
2224   if (x->has_index()) {                                                                                                              
2225     if (index_op->type() == T_LONG) {                                                                                                
2226       index_op = new_register(T_INT);                                                                                                
2227       __ convert(Bytecodes::_l2i, idx.result(), index_op);                                                                           
2228     }                                                                                                                                
2229   }                                                                                                                                  
2230   // At this point base and index should be all ints and not constants                                                               
2231   assert(base_op->type() == T_INT && !base_op->is_constant(), "base should be an non-constant int");                                 
2232   assert(!x->has_index() || (index_op->type() == T_INT && !index_op->is_constant()), "index should be an non-constant int");         
2233 #else                                                                                                                                
2234   if (x->has_index()) {                                                                                                              
2235     if (index_op->type() == T_INT) {                                                                                                 
2236       index_op = new_register(T_LONG);                                                                                               
2237       __ convert(Bytecodes::_i2l, idx.result(), index_op);                                                                           
2238     }                                                                                                                                
2239   }                                                                                                                                  
2240   // At this point base and index are long and non-constant                                                                          
2241   assert(base_op->type() == T_LONG && !base_op->is_constant(), "base must be a non-constant long");                                  
2242   assert(!x->has_index() || (index_op->type() == T_LONG && !index_op->is_constant()), "index must be a non-constant long");          
2243 #endif                                                                                                                               
2244 
2245   if (log2_scale != 0) {                                                                                                             
2246     // temporary fix (platform dependent code without shift on Intel would be better)                                                
2247     // TODO: ARM also allows embedded shift in the address                                                                           
2248     LIR_Opr tmp = new_pointer_register();                                                                                            
2249     if (TwoOperandLIRForm) {                                                                                                         
2250       __ move(index_op, tmp);                                                                                                        
2251       index_op = tmp;                                                                                                                
2252     }                                                                                                                                
2253     __ shift_left(index_op, log2_scale, tmp);                                                                                        
2254     if (!TwoOperandLIRForm) {                                                                                                        
2255       index_op = tmp;                                                                                                                
2256     }                                                                                                                                
2257   }                                                                                                                                  
2258 
2259   LIR_Address* addr = new LIR_Address(base_op, index_op, x->basic_type());                                                           
2260 #endif // !GENERATE_ADDRESS_IS_PREFERRED                                                                                             
2261   __ move(value.result(), addr);                                                                                                     
2262 }                                                                                                                                    
2263 
2264 
2265 void LIRGenerator::do_UnsafeGetObject(UnsafeGetObject* x) {                                                                          
2266   BasicType type = x->basic_type();                                                                                                  
2267   LIRItem src(x->object(), this);                                                                                                    
2268   LIRItem off(x->offset(), this);                                                                                                    
2269 
2270   off.load_item();                                                                                                                   
2271   src.load_item();                                                                                                                   
2272 
2273   LIR_Opr value = rlock_result(x, x->basic_type());                                                                                  
2274 
2275   if (support_IRIW_for_not_multiple_copy_atomic_cpu && x->is_volatile() && os::is_MP()) {                                            
2276     __ membar();                                                                                                                     
2277   }                                                                                                                                  
2278 
2279   get_Object_unsafe(value, src.result(), off.result(), type, x->is_volatile());                                                      
2280 
2281 #if INCLUDE_ALL_GCS                                                                                                                  
2282   // We might be reading the value of the referent field of a                                                                        
2283   // Reference object in order to attach it back to the live                                                                         
2284   // object graph. If G1 is enabled then we need to record                                                                           
2285   // the value that is being returned in an SATB log buffer.                                                                         
2286   //                                                                                                                                 
2287   // We need to generate code similar to the following...                                                                            
2288   //                                                                                                                                 
2289   // if (offset == java_lang_ref_Reference::referent_offset) {                                                                       
2290   //   if (src != NULL) {                                                                                                            
2291   //     if (klass(src)->reference_type() != REF_NONE) {                                                                             
2292   //       pre_barrier(..., value, ...);                                                                                             
2293   //     }                                                                                                                           
2294   //   }                                                                                                                             
2295   // }                                                                                                                               
2296 
2297   if (UseG1GC && type == T_OBJECT) {                                                                                                 
2298     bool gen_pre_barrier = true;     // Assume we need to generate pre_barrier.                                                      
2299     bool gen_offset_check = true;    // Assume we need to generate the offset guard.                                                 
2300     bool gen_source_check = true;    // Assume we need to check the src object for null.                                             
2301     bool gen_type_check = true;      // Assume we need to check the reference_type.                                                  
2302 
2303     if (off.is_constant()) {                                                                                                         
2304       jlong off_con = (off.type()->is_int() ?                                                                                        
2305                         (jlong) off.get_jint_constant() :                                                                            
2306                         off.get_jlong_constant());                                                                                   
2307 
2308 
2309       if (off_con != (jlong) java_lang_ref_Reference::referent_offset) {                                                             
2310         // The constant offset is something other than referent_offset.                                                              
2311         // We can skip generating/checking the remaining guards and                                                                  
2312         // skip generation of the code stub.                                                                                         
2313         gen_pre_barrier = false;                                                                                                     
2314       } else {                                                                                                                       
2315         // The constant offset is the same as referent_offset -                                                                      
2316         // we do not need to generate a runtime offset check.                                                                        
2317         gen_offset_check = false;                                                                                                    
2318       }                                                                                                                              
2319     }                                                                                                                                
2320 
2321     // We don't need to generate stub if the source object is an array                                                               
2322     if (gen_pre_barrier && src.type()->is_array()) {                                                                                 
2323       gen_pre_barrier = false;                                                                                                       
2324     }                                                                                                                                
2325 
2326     if (gen_pre_barrier) {                                                                                                           
2327       // We still need to continue with the checks.                                                                                  
2328       if (src.is_constant()) {                                                                                                       
2329         ciObject* src_con = src.get_jobject_constant();                                                                              
2330         guarantee(src_con != NULL, "no source constant");                                                                            
2331 
2332         if (src_con->is_null_object()) {                                                                                             
2333           // The constant src object is null - We can skip                                                                           
2334           // generating the code stub.                                                                                               
2335           gen_pre_barrier = false;                                                                                                   
2336         } else {                                                                                                                     
2337           // Non-null constant source object. We still have to generate                                                              
2338           // the slow stub - but we don't need to generate the runtime                                                               
2339           // null object check.                                                                                                      
2340           gen_source_check = false;                                                                                                  
2341         }                                                                                                                            
2342       }                                                                                                                              
2343     }                                                                                                                                
2344     if (gen_pre_barrier && !PatchALot) {                                                                                             
2345       // Can the klass of object be statically determined to be                                                                      
2346       // a sub-class of Reference?                                                                                                   
2347       ciType* type = src.value()->declared_type();                                                                                   
2348       if ((type != NULL) && type->is_loaded()) {                                                                                     
2349         if (type->is_subtype_of(compilation()->env()->Reference_klass())) {                                                          
2350           gen_type_check = false;                                                                                                    
2351         } else if (type->is_klass() &&                                                                                               
2352                    !compilation()->env()->Object_klass()->is_subtype_of(type->as_klass())) {                                         
2353           // Not Reference and not Object klass.                                                                                     
2354           gen_pre_barrier = false;                                                                                                   
2355         }                                                                                                                            
2356       }                                                                                                                              
2357     }                                                                                                                                
2358 
2359     if (gen_pre_barrier) {                                                                                                           
2360       LabelObj* Lcont = new LabelObj();                                                                                              
2361 
2362       // We can have generate one runtime check here. Let's start with                                                               
2363       // the offset check.                                                                                                           
2364       if (gen_offset_check) {                                                                                                        
2365         // if (offset != referent_offset) -> continue                                                                                
2366         // If offset is an int then we can do the comparison with the                                                                
2367         // referent_offset constant; otherwise we need to move                                                                       
2368         // referent_offset into a temporary register and generate                                                                    
2369         // a reg-reg compare.                                                                                                        
2370 
2371         LIR_Opr referent_off;                                                                                                        
2372 
2373         if (off.type()->is_int()) {                                                                                                  
2374           referent_off = LIR_OprFact::intConst(java_lang_ref_Reference::referent_offset);                                            
2375         } else {                                                                                                                     
2376           assert(off.type()->is_long(), "what else?");                                                                               
2377           referent_off = new_register(T_LONG);                                                                                       
2378           __ move(LIR_OprFact::longConst(java_lang_ref_Reference::referent_offset), referent_off);                                   
2379         }                                                                                                                            
2380         __ cmp(lir_cond_notEqual, off.result(), referent_off);                                                                       
2381         __ branch(lir_cond_notEqual, as_BasicType(off.type()), Lcont->label());                                                      
2382       }                                                                                                                              
2383       if (gen_source_check) {                                                                                                        
2384         // offset is a const and equals referent offset                                                                              
2385         // if (source == null) -> continue                                                                                           
2386         __ cmp(lir_cond_equal, src.result(), LIR_OprFact::oopConst(NULL));                                                           
2387         __ branch(lir_cond_equal, T_OBJECT, Lcont->label());                                                                         
2388       }                                                                                                                              
2389       LIR_Opr src_klass = new_register(T_OBJECT);                                                                                    
2390       if (gen_type_check) {                                                                                                          
2391         // We have determined that offset == referent_offset && src != null.                                                         
2392         // if (src->_klass->_reference_type == REF_NONE) -> continue                                                                 
2393         __ move(new LIR_Address(src.result(), oopDesc::klass_offset_in_bytes(), T_ADDRESS), src_klass);                              
2394         LIR_Address* reference_type_addr = new LIR_Address(src_klass, in_bytes(InstanceKlass::reference_type_offset()), T_BYTE);     
2395         LIR_Opr reference_type = new_register(T_INT);                                                                                
2396         __ move(reference_type_addr, reference_type);                                                                                
2397         __ cmp(lir_cond_equal, reference_type, LIR_OprFact::intConst(REF_NONE));                                                     
2398         __ branch(lir_cond_equal, T_INT, Lcont->label());                                                                            
2399       }                                                                                                                              
2400       {                                                                                                                              
2401         // We have determined that src->_klass->_reference_type != REF_NONE                                                          
2402         // so register the value in the referent field with the pre-barrier.                                                         
2403         pre_barrier(LIR_OprFact::illegalOpr /* addr_opr */,                                                                          
2404                     value  /* pre_val */,                                                                                            
2405                     false  /* do_load */,                                                                                            
2406                     false  /* patch */,                                                                                              
2407                     NULL   /* info */);                                                                                              
2408       }                                                                                                                              
2409       __ branch_destination(Lcont->label());                                                                                         
2410     }                                                                                                                                
2411   }                                                                                                                                  
2412 #endif // INCLUDE_ALL_GCS                                                                                                            
2413 
2414   if (x->is_volatile() && os::is_MP()) __ membar_acquire();                                                                          
2415 
2416   /* Normalize boolean value returned by unsafe operation, i.e., value  != 0 ? value = true : value false. */                        
2417   if (type == T_BOOLEAN) {                                                                                                           
2418     LabelObj* equalZeroLabel = new LabelObj();                                                                                       
2419     __ cmp(lir_cond_equal, value, 0);                                                                                                
2420     __ branch(lir_cond_equal, T_BOOLEAN, equalZeroLabel->label());                                                                   
2421     __ move(LIR_OprFact::intConst(1), value);                                                                                        
2422     __ branch_destination(equalZeroLabel->label());                                                                                  
2423   }                                                                                                                                  
2424 }                                                                                                                                    
2425 
2426 
2427 void LIRGenerator::do_UnsafePutObject(UnsafePutObject* x) {                                                                          
2428   BasicType type = x->basic_type();                                                                                                  
2429   LIRItem src(x->object(), this);                                                                                                    
2430   LIRItem off(x->offset(), this);                                                                                                    
2431   LIRItem data(x->value(), this);                                                                                                    
2432 
2433   src.load_item();                                                                                                                   
2434   if (type == T_BOOLEAN || type == T_BYTE) {                                                                                         
2435     data.load_byte_item();                                                                                                           
2436   } else {                                                                                                                           
2437     data.load_item();                                                                                                                
2438   }                                                                                                                                  
2439   off.load_item();                                                                                                                   
2440 
2441   set_no_result(x);                                                                                                                  
2442 
2443   if (x->is_volatile() && os::is_MP()) __ membar_release();                                                                          
2444   put_Object_unsafe(src.result(), off.result(), data.result(), type, x->is_volatile());                                              
2445   if (!support_IRIW_for_not_multiple_copy_atomic_cpu && x->is_volatile() && os::is_MP()) __ membar();                                
2446 }                                                                                                                                    
2447 
2448 
2449 void LIRGenerator::do_SwitchRanges(SwitchRangeArray* x, LIR_Opr value, BlockBegin* default_sux) {                                    
2450   int lng = x->length();                                                                                                             
2451 
2452   for (int i = 0; i < lng; i++) {                                                                                                    
2453     SwitchRange* one_range = x->at(i);                                                                                               
2454     int low_key = one_range->low_key();                                                                                              
2455     int high_key = one_range->high_key();                                                                                            
2456     BlockBegin* dest = one_range->sux();                                                                                             
2457     if (low_key == high_key) {                                                                                                       
2458       __ cmp(lir_cond_equal, value, low_key);                                                                                        
2459       __ branch(lir_cond_equal, T_INT, dest);                                                                                        
2460     } else if (high_key - low_key == 1) {                                                                                            
2461       __ cmp(lir_cond_equal, value, low_key);                                                                                        
2462       __ branch(lir_cond_equal, T_INT, dest);                                                                                        
2463       __ cmp(lir_cond_equal, value, high_key);                                                                                       
2464       __ branch(lir_cond_equal, T_INT, dest);                                                                                        
2465     } else {                                                                                                                         
2466       LabelObj* L = new LabelObj();                                                                                                  
2467       __ cmp(lir_cond_less, value, low_key);                                                                                         
2468       __ branch(lir_cond_less, T_INT, L->label());                                                                                   
2469       __ cmp(lir_cond_lessEqual, value, high_key);                                                                                   
2470       __ branch(lir_cond_lessEqual, T_INT, dest);                                                                                    
2471       __ branch_destination(L->label());                                                                                             
2472     }                                                                                                                                
2473   }                                                                                                                                  
2474   __ jump(default_sux);                                                                                                              
2475 }                                                                                                                                    
2476 
2477 
2478 SwitchRangeArray* LIRGenerator::create_lookup_ranges(TableSwitch* x) {                                                               
2479   SwitchRangeList* res = new SwitchRangeList();                                                                                      
2480   int len = x->length();                                                                                                             
2481   if (len > 0) {                                                                                                                     
2482     BlockBegin* sux = x->sux_at(0);                                                                                                  
2483     int key = x->lo_key();                                                                                                           
2484     BlockBegin* default_sux = x->default_sux();                                                                                      
2485     SwitchRange* range = new SwitchRange(key, sux);                                                                                  
2486     for (int i = 0; i < len; i++, key++) {                                                                                           
2487       BlockBegin* new_sux = x->sux_at(i);                                                                                            
2488       if (sux == new_sux) {                                                                                                          
2489         // still in same range                                                                                                       
2490         range->set_high_key(key);                                                                                                    
2491       } else {                                                                                                                       
2492         // skip tests which explicitly dispatch to the default                                                                       
2493         if (sux != default_sux) {                                                                                                    
2494           res->append(range);                                                                                                        
2495         }                                                                                                                            
2496         range = new SwitchRange(key, new_sux);                                                                                       
2497       }                                                                                                                              
2498       sux = new_sux;                                                                                                                 
2499     }                                                                                                                                
2500     if (res->length() == 0 || res->last() != range)  res->append(range);                                                             
2501   }                                                                                                                                  
2502   return res;                                                                                                                        
2503 }                                                                                                                                    
2504 
2505 
2506 // we expect the keys to be sorted by increasing value                                                                               
2507 SwitchRangeArray* LIRGenerator::create_lookup_ranges(LookupSwitch* x) {                                                              
2508   SwitchRangeList* res = new SwitchRangeList();                                                                                      
2509   int len = x->length();                                                                                                             
2510   if (len > 0) {                                                                                                                     
2511     BlockBegin* default_sux = x->default_sux();                                                                                      
2512     int key = x->key_at(0);                                                                                                          
2513     BlockBegin* sux = x->sux_at(0);                                                                                                  
2514     SwitchRange* range = new SwitchRange(key, sux);                                                                                  
2515     for (int i = 1; i < len; i++) {                                                                                                  
2516       int new_key = x->key_at(i);                                                                                                    
2517       BlockBegin* new_sux = x->sux_at(i);                                                                                            
2518       if (key+1 == new_key && sux == new_sux) {                                                                                      
2519         // still in same range                                                                                                       
2520         range->set_high_key(new_key);                                                                                                
2521       } else {                                                                                                                       
2522         // skip tests which explicitly dispatch to the default                                                                       
2523         if (range->sux() != default_sux) {                                                                                           
2524           res->append(range);                                                                                                        
2525         }                                                                                                                            
2526         range = new SwitchRange(new_key, new_sux);                                                                                   
2527       }                                                                                                                              
2528       key = new_key;                                                                                                                 
2529       sux = new_sux;                                                                                                                 
2530     }                                                                                                                                
2531     if (res->length() == 0 || res->last() != range)  res->append(range);                                                             
2532   }                                                                                                                                  
2533   return res;                                                                                                                        
2534 }                                                                                                                                    
2535 
2536 
2537 void LIRGenerator::do_TableSwitch(TableSwitch* x) {                                                                                  
2538   LIRItem tag(x->tag(), this);                                                                                                       
2539   tag.load_item();                                                                                                                   
2540   set_no_result(x);                                                                                                                  
2541 
2542   if (x->is_safepoint()) {                                                                                                           
2543     __ safepoint(safepoint_poll_register(), state_for(x, x->state_before()));                                                        
2544   }                                                                                                                                  
2545 
2546   // move values into phi locations                                                                                                  
2547   move_to_phi(x->state());                                                                                                           
2548 
2549   int lo_key = x->lo_key();                                                                                                          
2550   int hi_key = x->hi_key();                                                                                                          
2551   int len = x->length();                                                                                                             
2552   LIR_Opr value = tag.result();                                                                                                      
2553   if (UseTableRanges) {                                                                                                              
2554     do_SwitchRanges(create_lookup_ranges(x), value, x->default_sux());                                                               
2555   } else {                                                                                                                           
2556     for (int i = 0; i < len; i++) {                                                                                                  
2557       __ cmp(lir_cond_equal, value, i + lo_key);                                                                                     
2558       __ branch(lir_cond_equal, T_INT, x->sux_at(i));                                                                                
2559     }                                                                                                                                
2560     __ jump(x->default_sux());                                                                                                       
2561   }                                                                                                                                  
2562 }                                                                                                                                    
2563 
2564 
2565 void LIRGenerator::do_LookupSwitch(LookupSwitch* x) {                                                                                
2566   LIRItem tag(x->tag(), this);                                                                                                       
2567   tag.load_item();                                                                                                                   
2568   set_no_result(x);                                                                                                                  
2569 
2570   if (x->is_safepoint()) {                                                                                                           
2571     __ safepoint(safepoint_poll_register(), state_for(x, x->state_before()));                                                        
2572   }                                                                                                                                  
2573 
2574   // move values into phi locations                                                                                                  
2575   move_to_phi(x->state());                                                                                                           
2576 
2577   LIR_Opr value = tag.result();                                                                                                      
2578   if (UseTableRanges) {                                                                                                              
2579     do_SwitchRanges(create_lookup_ranges(x), value, x->default_sux());                                                               
2580   } else {                                                                                                                           
2581     int len = x->length();                                                                                                           
2582     for (int i = 0; i < len; i++) {                                                                                                  
2583       __ cmp(lir_cond_equal, value, x->key_at(i));                                                                                   
2584       __ branch(lir_cond_equal, T_INT, x->sux_at(i));                                                                                
2585     }                                                                                                                                
2586     __ jump(x->default_sux());                                                                                                       
2587   }                                                                                                                                  
2588 }                                                                                                                                    
2589 
2590 
2591 void LIRGenerator::do_Goto(Goto* x) {                                                                                                
2592   set_no_result(x);                                                                                                                  
2593 
2594   if (block()->next()->as_OsrEntry()) {                                                                                              
2595     // need to free up storage used for OSR entry point                                                                              
2596     LIR_Opr osrBuffer = block()->next()->operand();                                                                                  
2597     BasicTypeList signature;                                                                                                         
2598     signature.append(NOT_LP64(T_INT) LP64_ONLY(T_LONG)); // pass a pointer to osrBuffer                                              
2599     CallingConvention* cc = frame_map()->c_calling_convention(&signature);                                                           
2600     __ move(osrBuffer, cc->args()->at(0));                                                                                           
2601     __ call_runtime_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_end),                                                
2602                          getThreadTemp(), LIR_OprFact::illegalOpr, cc->args());                                                      
2603   }                                                                                                                                  
2604 
2605   if (x->is_safepoint()) {                                                                                                           
2606     ValueStack* state = x->state_before() ? x->state_before() : x->state();                                                          
2607 
2608     // increment backedge counter if needed                                                                                          
2609     CodeEmitInfo* info = state_for(x, state);                                                                                        
2610     increment_backedge_counter(info, x->profiled_bci());                                                                             
2611     CodeEmitInfo* safepoint_info = state_for(x, state);                                                                              
2612     __ safepoint(safepoint_poll_register(), safepoint_info);                                                                         
2613   }                                                                                                                                  
2614 
2615   // Gotos can be folded Ifs, handle this case.                                                                                      
2616   if (x->should_profile()) {                                                                                                         
2617     ciMethod* method = x->profiled_method();                                                                                         
2618     assert(method != NULL, "method should be set if branch is profiled");                                                            
2619     ciMethodData* md = method->method_data_or_null();                                                                                
2620     assert(md != NULL, "Sanity");                                                                                                    
2621     ciProfileData* data = md->bci_to_data(x->profiled_bci());                                                                        
2622     assert(data != NULL, "must have profiling data");                                                                                
2623     int offset;                                                                                                                      
2624     if (x->direction() == Goto::taken) {                                                                                             
2625       assert(data->is_BranchData(), "need BranchData for two-way branches");                                                         
2626       offset = md->byte_offset_of_slot(data, BranchData::taken_offset());                                                            
2627     } else if (x->direction() == Goto::not_taken) {                                                                                  
2628       assert(data->is_BranchData(), "need BranchData for two-way branches");                                                         
2629       offset = md->byte_offset_of_slot(data, BranchData::not_taken_offset());                                                        
2630     } else {                                                                                                                         
2631       assert(data->is_JumpData(), "need JumpData for branches");                                                                     
2632       offset = md->byte_offset_of_slot(data, JumpData::taken_offset());                                                              
2633     }                                                                                                                                
2634     LIR_Opr md_reg = new_register(T_METADATA);                                                                                       
2635     __ metadata2reg(md->constant_encoding(), md_reg);                                                                                
2636 
2637     increment_counter(new LIR_Address(md_reg, offset,                                                                                
2638                                       NOT_LP64(T_INT) LP64_ONLY(T_LONG)), DataLayout::counter_increment);                            
2639   }                                                                                                                                  
2640 
2641   // emit phi-instruction move after safepoint since this simplifies                                                                 
2642   // describing the state as the safepoint.                                                                                          
2643   move_to_phi(x->state());                                                                                                           
2644 
2645   __ jump(x->default_sux());                                                                                                         
2646 }                                                                                                                                    
2647 
2648 /**                                                                                                                                  
2649  * Emit profiling code if needed for arguments, parameters, return value types                                                       
2650  *                                                                                                                                   
2651  * @param md                    MDO the code will update at runtime                                                                  
2652  * @param md_base_offset        common offset in the MDO for this profile and subsequent ones                                        
2653  * @param md_offset             offset in the MDO (on top of md_base_offset) for this profile                                        
2654  * @param profiled_k            current profile                                                                                      
2655  * @param obj                   IR node for the object to be profiled                                                                
2656  * @param mdp                   register to hold the pointer inside the MDO (md + md_base_offset).                                   
2657  *                              Set once we find an update to make and use for next ones.                                            
2658  * @param not_null              true if we know obj cannot be null                                                                   
2659  * @param signature_at_call_k   signature at call for obj                                                                            
2660  * @param callee_signature_k    signature of callee for obj                                                                          
2661  *                              at call and callee signatures differ at method handle call                                           
2662  * @return                      the only klass we know will ever be seen at this profile point                                       
2663  */                                                                                                                                  
2664 ciKlass* LIRGenerator::profile_type(ciMethodData* md, int md_base_offset, int md_offset, intptr_t profiled_k,                        
2665                                     Value obj, LIR_Opr& mdp, bool not_null, ciKlass* signature_at_call_k,                            
2666                                     ciKlass* callee_signature_k) {                                                                   
2667   ciKlass* result = NULL;                                                                                                            
2668   bool do_null = !not_null && !TypeEntries::was_null_seen(profiled_k);                                                               
2669   bool do_update = !TypeEntries::is_type_unknown(profiled_k);                                                                        
2670   // known not to be null or null bit already set and already set to                                                                 
2671   // unknown: nothing we can do to improve profiling                                                                                 
2672   if (!do_null && !do_update) {                                                                                                      
2673     return result;                                                                                                                   
2674   }                                                                                                                                  
2675 
2676   ciKlass* exact_klass = NULL;                                                                                                       
2677   Compilation* comp = Compilation::current();                                                                                        
2678   if (do_update) {                                                                                                                   
2679     // try to find exact type, using CHA if possible, so that loading                                                                
2680     // the klass from the object can be avoided                                                                                      
2681     ciType* type = obj->exact_type();                                                                                                
2682     if (type == NULL) {                                                                                                              
2683       type = obj->declared_type();                                                                                                   
2684       type = comp->cha_exact_type(type);                                                                                             
2685     }                                                                                                                                
2686     assert(type == NULL || type->is_klass(), "type should be class");                                                                
2687     exact_klass = (type != NULL && type->is_loaded()) ? (ciKlass*)type : NULL;                                                       
2688 
2689     do_update = exact_klass == NULL || ciTypeEntries::valid_ciklass(profiled_k) != exact_klass;                                      
2690   }                                                                                                                                  
2691 
2692   if (!do_null && !do_update) {                                                                                                      
2693     return result;                                                                                                                   
2694   }                                                                                                                                  
2695 
2696   ciKlass* exact_signature_k = NULL;                                                                                                 
2697   if (do_update) {                                                                                                                   
2698     // Is the type from the signature exact (the only one possible)?                                                                 
2699     exact_signature_k = signature_at_call_k->exact_klass();                                                                          
2700     if (exact_signature_k == NULL) {                                                                                                 
2701       exact_signature_k = comp->cha_exact_type(signature_at_call_k);                                                                 
2702     } else {                                                                                                                         
2703       result = exact_signature_k;                                                                                                    
2704       // Known statically. No need to emit any code: prevent                                                                         
2705       // LIR_Assembler::emit_profile_type() from emitting useless code                                                               
2706       profiled_k = ciTypeEntries::with_status(result, profiled_k);                                                                   
2707     }                                                                                                                                
2708     // exact_klass and exact_signature_k can be both non NULL but                                                                    
2709     // different if exact_klass is loaded after the ciObject for                                                                     
2710     // exact_signature_k is created.                                                                                                 
2711     if (exact_klass == NULL && exact_signature_k != NULL && exact_klass != exact_signature_k) {                                      
2712       // sometimes the type of the signature is better than the best type                                                            
2713       // the compiler has                                                                                                            
2714       exact_klass = exact_signature_k;                                                                                               
2715     }                                                                                                                                
2716     if (callee_signature_k != NULL &&                                                                                                
2717         callee_signature_k != signature_at_call_k) {                                                                                 
2718       ciKlass* improved_klass = callee_signature_k->exact_klass();                                                                   
2719       if (improved_klass == NULL) {                                                                                                  
2720         improved_klass = comp->cha_exact_type(callee_signature_k);                                                                   
2721       }                                                                                                                              
2722       if (exact_klass == NULL && improved_klass != NULL && exact_klass != improved_klass) {                                          
2723         exact_klass = exact_signature_k;                                                                                             
2724       }                                                                                                                              
2725     }                                                                                                                                
2726     do_update = exact_klass == NULL || ciTypeEntries::valid_ciklass(profiled_k) != exact_klass;                                      
2727   }                                                                                                                                  
2728 
2729   if (!do_null && !do_update) {                                                                                                      
2730     return result;                                                                                                                   
2731   }                                                                                                                                  
2732 
2733   if (mdp == LIR_OprFact::illegalOpr) {                                                                                              
2734     mdp = new_register(T_METADATA);                                                                                                  
2735     __ metadata2reg(md->constant_encoding(), mdp);                                                                                   
2736     if (md_base_offset != 0) {                                                                                                       
2737       LIR_Address* base_type_address = new LIR_Address(mdp, md_base_offset, T_ADDRESS);                                              
2738       mdp = new_pointer_register();                                                                                                  
2739       __ leal(LIR_OprFact::address(base_type_address), mdp);                                                                         
2740     }                                                                                                                                
2741   }                                                                                                                                  
2742   LIRItem value(obj, this);                                                                                                          
2743   value.load_item();                                                                                                                 
2744   __ profile_type(new LIR_Address(mdp, md_offset, T_METADATA),                                                                       
2745                   value.result(), exact_klass, profiled_k, new_pointer_register(), not_null, exact_signature_k != NULL);             
2746   return result;                                                                                                                     
2747 }                                                                                                                                    
2748 
2749 // profile parameters on entry to the root of the compilation                                                                        
2750 void LIRGenerator::profile_parameters(Base* x) {                                                                                     
2751   if (compilation()->profile_parameters()) {                                                                                         
2752     CallingConvention* args = compilation()->frame_map()->incoming_arguments();                                                      
2753     ciMethodData* md = scope()->method()->method_data_or_null();                                                                     
2754     assert(md != NULL, "Sanity");                                                                                                    
2755 
2756     if (md->parameters_type_data() != NULL) {                                                                                        
2757       ciParametersTypeData* parameters_type_data = md->parameters_type_data();                                                       
2758       ciTypeStackSlotEntries* parameters =  parameters_type_data->parameters();                                                      
2759       LIR_Opr mdp = LIR_OprFact::illegalOpr;                                                                                         
2760       for (int java_index = 0, i = 0, j = 0; j < parameters_type_data->number_of_parameters(); i++) {                                
2761         LIR_Opr src = args->at(i);                                                                                                   
2762         assert(!src->is_illegal(), "check");                                                                                         
2763         BasicType t = src->type();                                                                                                   
2764         if (t == T_OBJECT || t == T_ARRAY) {                                                                                         
2765           intptr_t profiled_k = parameters->type(j);                                                                                 
2766           Local* local = x->state()->local_at(java_index)->as_Local();                                                               
2767           ciKlass* exact = profile_type(md, md->byte_offset_of_slot(parameters_type_data, ParametersTypeData::type_offset(0)),       
2768                                         in_bytes(ParametersTypeData::type_offset(j)) - in_bytes(ParametersTypeData::type_offset(0)), 
2769                                         profiled_k, local, mdp, false, local->declared_type()->as_klass(), NULL);                    
2770           // If the profile is known statically set it once for all and do not emit any code                                         
2771           if (exact != NULL) {                                                                                                       
2772             md->set_parameter_type(j, exact);                                                                                        
2773           }                                                                                                                          
2774           j++;                                                                                                                       
2775         }                                                                                                                            
2776         java_index += type2size[t];                                                                                                  
2777       }                                                                                                                              
2778     }                                                                                                                                
2779   }                                                                                                                                  
2780 }                                                                                                                                    
2781 
2782 void LIRGenerator::do_Base(Base* x) {                                                                                                
2783   __ std_entry(LIR_OprFact::illegalOpr);                                                                                             
2784   // Emit moves from physical registers / stack slots to virtual registers                                                           
2785   CallingConvention* args = compilation()->frame_map()->incoming_arguments();                                                        
2786   IRScope* irScope = compilation()->hir()->top_scope();                                                                              
2787   int java_index = 0;                                                                                                                
2788   for (int i = 0; i < args->length(); i++) {                                                                                         
2789     LIR_Opr src = args->at(i);                                                                                                       
2790     assert(!src->is_illegal(), "check");                                                                                             
2791     BasicType t = src->type();                                                                                                       
2792 
2793     // Types which are smaller than int are passed as int, so                                                                        
2794     // correct the type which passed.                                                                                                
2795     switch (t) {                                                                                                                     
2796     case T_BYTE:                                                                                                                     
2797     case T_BOOLEAN:                                                                                                                  
2798     case T_SHORT:                                                                                                                    
2799     case T_CHAR:                                                                                                                     
2800       t = T_INT;                                                                                                                     
2801       break;                                                                                                                         
2802     default:                                                                                                                         
2803       break;                                                                                                                         
2804     }                                                                                                                                
2805 
2806     LIR_Opr dest = new_register(t);                                                                                                  
2807     __ move(src, dest);                                                                                                              
2808 
2809     // Assign new location to Local instruction for this local                                                                       
2810     Local* local = x->state()->local_at(java_index)->as_Local();                                                                     
2811     assert(local != NULL, "Locals for incoming arguments must have been created");                                                   
2812 #ifndef __SOFTFP__                                                                                                                   
2813     // The java calling convention passes double as long and float as int.                                                           
2814     assert(as_ValueType(t)->tag() == local->type()->tag(), "check");                                                                 
2815 #endif // __SOFTFP__                                                                                                                 
2816     local->set_operand(dest);                                                                                                        
2817     _instruction_for_operand.at_put_grow(dest->vreg_number(), local, NULL);                                                          
2818     java_index += type2size[t];                                                                                                      
2819   }                                                                                                                                  
2820 
2821   if (compilation()->env()->dtrace_method_probes()) {                                                                                
2822     BasicTypeList signature;                                                                                                         
2823     signature.append(LP64_ONLY(T_LONG) NOT_LP64(T_INT));    // thread                                                                
2824     signature.append(T_METADATA); // Method*                                                                                         
2825     LIR_OprList* args = new LIR_OprList();                                                                                           
2826     args->append(getThreadPointer());                                                                                                
2827     LIR_Opr meth = new_register(T_METADATA);                                                                                         
2828     __ metadata2reg(method()->constant_encoding(), meth);                                                                            
2829     args->append(meth);                                                                                                              
2830     call_runtime(&signature, args, CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), voidType, NULL);                   
2831   }                                                                                                                                  
2832 
2833   if (method()->is_synchronized()) {                                                                                                 
2834     LIR_Opr obj;                                                                                                                     
2835     if (method()->is_static()) {                                                                                                     
2836       obj = new_register(T_OBJECT);                                                                                                  
2837       __ oop2reg(method()->holder()->java_mirror()->constant_encoding(), obj);                                                       
2838     } else {                                                                                                                         
2839       Local* receiver = x->state()->local_at(0)->as_Local();                                                                         
2840       assert(receiver != NULL, "must already exist");                                                                                
2841       obj = receiver->operand();                                                                                                     
2842     }                                                                                                                                
2843     assert(obj->is_valid(), "must be valid");                                                                                        
2844 
2845     if (method()->is_synchronized() && GenerateSynchronizationCode) {                                                                
2846       LIR_Opr lock = syncLockOpr();                                                                                                  
2847       __ load_stack_address_monitor(0, lock);                                                                                        
2848 
2849       CodeEmitInfo* info = new CodeEmitInfo(scope()->start()->state()->copy(ValueStack::StateBefore, SynchronizationEntryBCI), NULL, 
2850       CodeStub* slow_path = new MonitorEnterStub(obj, lock, info);                                                                   
2851 
2852       // receiver is guaranteed non-NULL so don't need CodeEmitInfo                                                                  
2853       __ lock_object(syncTempOpr(), obj, lock, new_register(T_OBJECT), slow_path, NULL);                                             
2854     }                                                                                                                                
2855   }                                                                                                                                  
2856   if (compilation()->age_code()) {                                                                                                   
2857     CodeEmitInfo* info = new CodeEmitInfo(scope()->start()->state()->copy(ValueStack::StateBefore, 0), NULL, false);                 
2858     decrement_age(info);                                                                                                             
2859   }                                                                                                                                  
2860   // increment invocation counters if needed                                                                                         
2861   if (!method()->is_accessor()) { // Accessors do not have MDOs, so no counting.                                                     
2862     profile_parameters(x);                                                                                                           
2863     CodeEmitInfo* info = new CodeEmitInfo(scope()->start()->state()->copy(ValueStack::StateBefore, SynchronizationEntryBCI), NULL, fa
2864     increment_invocation_counter(info);                                                                                              
2865   }                                                                                                                                  
2866 
2867   // all blocks with a successor must end with an unconditional jump                                                                 
2868   // to the successor even if they are consecutive                                                                                   
2869   __ jump(x->default_sux());                                                                                                         
2870 }                                                                                                                                    
2871 
2872 
2873 void LIRGenerator::do_OsrEntry(OsrEntry* x) {                                                                                        
2874   // construct our frame and model the production of incoming pointer                                                                
2875   // to the OSR buffer.                                                                                                              
2876   __ osr_entry(LIR_Assembler::osrBufferPointer());                                                                                   
2877   LIR_Opr result = rlock_result(x);                                                                                                  
2878   __ move(LIR_Assembler::osrBufferPointer(), result);                                                                                
2879 }                                                                                                                                    
2880 
2881 
2882 void LIRGenerator::invoke_load_arguments(Invoke* x, LIRItemList* args, const LIR_OprList* arg_list) {                                
2883   assert(args->length() == arg_list->length(),                                                                                       
2884          "args=%d, arg_list=%d", args->length(), arg_list->length());                                                                
2885   for (int i = x->has_receiver() ? 1 : 0; i < args->length(); i++) {                                                                 
2886     LIRItem* param = args->at(i);                                                                                                    
2887     LIR_Opr loc = arg_list->at(i);                                                                                                   
2888     if (loc->is_register()) {                                                                                                        
2889       param->load_item_force(loc);                                                                                                   
2890     } else {                                                                                                                         
2891       LIR_Address* addr = loc->as_address_ptr();                                                                                     
2892       param->load_for_store(addr->type());                                                                                           
2893       if (addr->type() == T_OBJECT) {                                                                                                
2894         __ move_wide(param->result(), addr);                                                                                         
2895       } else                                                                                                                         
2896         if (addr->type() == T_LONG || addr->type() == T_DOUBLE) {                                                                    
2897           __ unaligned_move(param->result(), addr);                                                                                  
2898         } else {                                                                                                                     
2899           __ move(param->result(), addr);                                                                                            
2900         }                                                                                                                            
2901     }                                                                                                                                
2902   }                                                                                                                                  
2903 
2904   if (x->has_receiver()) {                                                                                                           
2905     LIRItem* receiver = args->at(0);                                                                                                 
2906     LIR_Opr loc = arg_list->at(0);                                                                                                   
2907     if (loc->is_register()) {                                                                                                        
2908       receiver->load_item_force(loc);                                                                                                
2909     } else {                                                                                                                         
2910       assert(loc->is_address(), "just checking");                                                                                    
2911       receiver->load_for_store(T_OBJECT);                                                                                            
2912       __ move_wide(receiver->result(), loc->as_address_ptr());                                                                       
2913     }                                                                                                                                
2914   }                                                                                                                                  
2915 }                                                                                                                                    
2916 
2917 
2918 // Visits all arguments, returns appropriate items without loading them                                                              
2919 LIRItemList* LIRGenerator::invoke_visit_arguments(Invoke* x) {                                                                       
2920   LIRItemList* argument_items = new LIRItemList();                                                                                   
2921   if (x->has_receiver()) {                                                                                                           
2922     LIRItem* receiver = new LIRItem(x->receiver(), this);                                                                            
2923     argument_items->append(receiver);                                                                                                
2924   }                                                                                                                                  
2925   for (int i = 0; i < x->number_of_arguments(); i++) {                                                                               
2926     LIRItem* param = new LIRItem(x->argument_at(i), this);                                                                           
2927     argument_items->append(param);                                                                                                   
2928   }                                                                                                                                  
2929   return argument_items;                                                                                                             
2930 }                                                                                                                                    
2931 
2932 
2933 // The invoke with receiver has following phases:                                                                                    
2934 //   a) traverse and load/lock receiver;                                                                                             
2935 //   b) traverse all arguments -> item-array (invoke_visit_argument)                                                                 
2936 //   c) push receiver on stack                                                                                                       
2937 //   d) load each of the items and push on stack                                                                                     
2938 //   e) unlock receiver                                                                                                              
2939 //   f) move receiver into receiver-register %o0                                                                                     
2940 //   g) lock result registers and emit call operation                                                                                
2941 //                                                                                                                                   
2942 // Before issuing a call, we must spill-save all values on stack                                                                     
2943 // that are in caller-save register. "spill-save" moves those registers                                                              
2944 // either in a free callee-save register or spills them if no free                                                                   
2945 // callee save register is available.                                                                                                
2946 //                                                                                                                                   
2947 // The problem is where to invoke spill-save.                                                                                        
2948 // - if invoked between e) and f), we may lock callee save                                                                           
2949 //   register in "spill-save" that destroys the receiver register                                                                    
2950 //   before f) is executed                                                                                                           
2951 // - if we rearrange f) to be earlier (by loading %o0) it                                                                            
2952 //   may destroy a value on the stack that is currently in %o0                                                                       
2953 //   and is waiting to be spilled                                                                                                    
2954 // - if we keep the receiver locked while doing spill-save,                                                                          
2955 //   we cannot spill it as it is spill-locked                                                                                        
2956 //                                                                                                                                   
2957 void LIRGenerator::do_Invoke(Invoke* x) {                                                                                            
2958   CallingConvention* cc = frame_map()->java_calling_convention(x->signature(), true);                                                
2959 
2960   LIR_OprList* arg_list = cc->args();                                                                                                
2961   LIRItemList* args = invoke_visit_arguments(x);                                                                                     
2962   LIR_Opr receiver = LIR_OprFact::illegalOpr;                                                                                        
2963 
2964   // setup result register                                                                                                           
2965   LIR_Opr result_register = LIR_OprFact::illegalOpr;                                                                                 
2966   if (x->type() != voidType) {                                                                                                       
2967     result_register = result_register_for(x->type());                                                                                
2968   }                                                                                                                                  
2969 
2970   CodeEmitInfo* info = state_for(x, x->state());                                                                                     
2971 
2972   invoke_load_arguments(x, args, arg_list);                                                                                          
2973 
2974   if (x->has_receiver()) {                                                                                                           
2975     args->at(0)->load_item_force(LIR_Assembler::receiverOpr());                                                                      
2976     receiver = args->at(0)->result();                                                                                                
2977   }                                                                                                                                  
2978 
2979   // emit invoke code                                                                                                                
2980   assert(receiver->is_illegal() || receiver->is_equal(LIR_Assembler::receiverOpr()), "must match");                                  
2981 
2982   // JSR 292                                                                                                                         
2983   // Preserve the SP over MethodHandle call sites, if needed.                                                                        
2984   ciMethod* target = x->target();                                                                                                    
2985   bool is_method_handle_invoke = (// %%% FIXME: Are both of these relevant?                                                          
2986                                   target->is_method_handle_intrinsic() ||                                                            
2987                                   target->is_compiled_lambda_form());                                                                
2988   if (is_method_handle_invoke) {                                                                                                     
2989     info->set_is_method_handle_invoke(true);                                                                                         
2990     if(FrameMap::method_handle_invoke_SP_save_opr() != LIR_OprFact::illegalOpr) {                                                    
2991         __ move(FrameMap::stack_pointer(), FrameMap::method_handle_invoke_SP_save_opr());                                            
2992     }                                                                                                                                
2993   }                                                                                                                                  
2994 
2995   switch (x->code()) {                                                                                                               
2996     case Bytecodes::_invokestatic:                                                                                                   
2997       __ call_static(target, result_register,                                                                                        
2998                      SharedRuntime::get_resolve_static_call_stub(),                                                                  
2999                      arg_list, info);                                                                                                
3000       break;                                                                                                                         
3001     case Bytecodes::_invokespecial:                                                                                                  
3002     case Bytecodes::_invokevirtual:                                                                                                  
3003     case Bytecodes::_invokeinterface:                                                                                                
3004       // for loaded and final (method or class) target we still produce an inline cache,                                             
3005       // in order to be able to call mixed mode                                                                                      
3006       if (x->code() == Bytecodes::_invokespecial || x->target_is_final()) {                                                          
3007         __ call_opt_virtual(target, receiver, result_register,                                                                       
3008                             SharedRuntime::get_resolve_opt_virtual_call_stub(),                                                      
3009                             arg_list, info);                                                                                         
3010       } else if (x->vtable_index() < 0) {                                                                                            
3011         __ call_icvirtual(target, receiver, result_register,                                                                         
3012                           SharedRuntime::get_resolve_virtual_call_stub(),                                                            
3013                           arg_list, info);                                                                                           
3014       } else {                                                                                                                       
3015         int entry_offset = in_bytes(Klass::vtable_start_offset()) + x->vtable_index() * vtableEntry::size_in_bytes();                
3016         int vtable_offset = entry_offset + vtableEntry::method_offset_in_bytes();                                                    
3017         __ call_virtual(target, receiver, result_register, vtable_offset, arg_list, info);                                           
3018       }                                                                                                                              
3019       break;                                                                                                                         
3020     case Bytecodes::_invokedynamic: {                                                                                                
3021       __ call_dynamic(target, receiver, result_register,                                                                             
3022                       SharedRuntime::get_resolve_static_call_stub(),                                                                 
3023                       arg_list, info);                                                                                               
3024       break;                                                                                                                         
3025     }                                                                                                                                
3026     default:                                                                                                                         
3027       fatal("unexpected bytecode: %s", Bytecodes::name(x->code()));                                                                  
3028       break;                                                                                                                         
3029   }                                                                                                                                  
3030 
3031   // JSR 292                                                                                                                         
3032   // Restore the SP after MethodHandle call sites, if needed.                                                                        
3033   if (is_method_handle_invoke                                                                                                        
3034       && FrameMap::method_handle_invoke_SP_save_opr() != LIR_OprFact::illegalOpr) {                                                  
3035     __ move(FrameMap::method_handle_invoke_SP_save_opr(), FrameMap::stack_pointer());                                                
3036   }                                                                                                                                  
3037 
3038   if (x->type()->is_float() || x->type()->is_double()) {                                                                             
3039     // Force rounding of results from non-strictfp when in strictfp                                                                  
3040     // scope (or when we don't know the strictness of the callee, to                                                                 
3041     // be safe.)                                                                                                                     
3042     if (method()->is_strict()) {                                                                                                     
3043       if (!x->target_is_loaded() || !x->target_is_strictfp()) {                                                                      
3044         result_register = round_item(result_register);                                                                               
3045       }                                                                                                                              
3046     }                                                                                                                                
3047   }                                                                                                                                  
3048 
3049   if (result_register->is_valid()) {                                                                                                 
3050     LIR_Opr result = rlock_result(x);                                                                                                
3051     __ move(result_register, result);                                                                                                
3052   }                                                                                                                                  
3053 }                                                                                                                                    
3054 
3055 
3056 void LIRGenerator::do_FPIntrinsics(Intrinsic* x) {                                                                                   
3057   assert(x->number_of_arguments() == 1, "wrong type");                                                                               
3058   LIRItem value       (x->argument_at(0), this);                                                                                     
3059   LIR_Opr reg = rlock_result(x);                                                                                                     
3060   value.load_item();                                                                                                                 
3061   LIR_Opr tmp = force_to_spill(value.result(), as_BasicType(x->type()));                                                             
3062   __ move(tmp, reg);                                                                                                                 
3063 }                                                                                                                                    
3064 
3065 
3066 
3067 // Code for  :  x->x() {x->cond()} x->y() ? x->tval() : x->fval()                                                                    
3068 void LIRGenerator::do_IfOp(IfOp* x) {                                                                                                
3069 #ifdef ASSERT                                                                                                                        
3070   {                                                                                                                                  
3071     ValueTag xtag = x->x()->type()->tag();                                                                                           
3072     ValueTag ttag = x->tval()->type()->tag();                                                                                        
3073     assert(xtag == intTag || xtag == objectTag, "cannot handle others");                                                             
3074     assert(ttag == addressTag || ttag == intTag || ttag == objectTag || ttag == longTag, "cannot handle others");                    
3075     assert(ttag == x->fval()->type()->tag(), "cannot handle others");                                                                
3076   }                                                                                                                                  
3077 #endif                                                                                                                               
3078 
3079   LIRItem left(x->x(), this);                                                                                                        
3080   LIRItem right(x->y(), this);                                                                                                       
3081   left.load_item();                                                                                                                  
3082   if (can_inline_as_constant(right.value())) {                                                                                       
3083     right.dont_load_item();                                                                                                          
3084   } else {                                                                                                                           
3085     right.load_item();                                                                                                               
3086   }                                                                                                                                  
3087 
3088   LIRItem t_val(x->tval(), this);                                                                                                    
3089   LIRItem f_val(x->fval(), this);                                                                                                    
3090   t_val.dont_load_item();                                                                                                            
3091   f_val.dont_load_item();                                                                                                            
3092   LIR_Opr reg = rlock_result(x);                                                                                                     
3093 
3094   __ cmp(lir_cond(x->cond()), left.result(), right.result());                                                                        
3095   __ cmove(lir_cond(x->cond()), t_val.result(), f_val.result(), reg, as_BasicType(x->x()->type()));                                  
3096 }                                                                                                                                    
3097 
3098 #ifdef TRACE_HAVE_INTRINSICS                                                                                                         
3099 void LIRGenerator::do_ClassIDIntrinsic(Intrinsic* x) {                                                                               
3100   CodeEmitInfo* info = state_for(x);                                                                                                 
3101   CodeEmitInfo* info2 = new CodeEmitInfo(info); // Clone for the second null check                                                   
3102 
3103   assert(info != NULL, "must have info");                                                                                            
3104   LIRItem arg(x->argument_at(0), this);                                                                                              
3105 
3106   arg.load_item();                                                                                                                   
3107   LIR_Opr klass = new_register(T_METADATA);                                                                                          
3108   __ move(new LIR_Address(arg.result(), java_lang_Class::klass_offset_in_bytes(), T_ADDRESS), klass, info);                          
3109   LIR_Opr id = new_register(T_LONG);                                                                                                 
3110   ByteSize offset = TRACE_KLASS_TRACE_ID_OFFSET;                                                                                     
3111   LIR_Address* trace_id_addr = new LIR_Address(klass, in_bytes(offset), T_LONG);                                                     
3112 
3113   __ move(trace_id_addr, id);                                                                                                        
3114   __ logical_or(id, LIR_OprFact::longConst(0x01l), id);                                                                              
3115   __ store(id, trace_id_addr);                                                                                                       
3116 
3117 #ifdef TRACE_ID_META_BITS                                                                                                            
3118   __ logical_and(id, LIR_OprFact::longConst(~TRACE_ID_META_BITS), id);                                                               
3119 #endif                                                                                                                               
3120 #ifdef TRACE_ID_CLASS_SHIFT                                                                                                          
3121   __ unsigned_shift_right(id, TRACE_ID_CLASS_SHIFT, id);                                                                             
3122 #endif                                                                                                                               
3123 
3124   __ move(id, rlock_result(x));                                                                                                      
3125 }                                                                                                                                    
3126 
3127 void LIRGenerator::do_getBufferWriter(Intrinsic* x) {                                                                                
3128   LabelObj* L_end = new LabelObj();                                                                                                  
3129 
3130   LIR_Address* jobj_addr = new LIR_Address(getThreadPointer(),                                                                       
3131                                            in_bytes(TRACE_THREAD_DATA_WRITER_OFFSET),                                                
3132                                            T_OBJECT);                                                                                
3133   LIR_Opr result = rlock_result(x);                                                                                                  
3134   __ move_wide(jobj_addr, result);                                                                                                   
3135   __ cmp(lir_cond_equal, result, LIR_OprFact::oopConst(NULL));                                                                       
3136   __ branch(lir_cond_equal, T_OBJECT, L_end->label());                                                                               
3137   __ move_wide(new LIR_Address(result, T_OBJECT), result);                                                                           
3138 
3139   __ branch_destination(L_end->label());                                                                                             
3140 }                                                                                                                                    
3141 
3142 #endif                                                                                                                               
3143 
3144 
3145 void LIRGenerator::do_RuntimeCall(address routine, Intrinsic* x) {                                                                   
3146   assert(x->number_of_arguments() == 0, "wrong type");                                                                               
3147   // Enforce computation of _reserved_argument_area_size which is required on some platforms.                                        
3148   BasicTypeList signature;                                                                                                           
3149   CallingConvention* cc = frame_map()->c_calling_convention(&signature);                                                             
3150   LIR_Opr reg = result_register_for(x->type());                                                                                      
3151   __ call_runtime_leaf(routine, getThreadTemp(),                                                                                     
3152                        reg, new LIR_OprList());                                                                                      
3153   LIR_Opr result = rlock_result(x);                                                                                                  
3154   __ move(reg, result);                                                                                                              
3155 }                                                                                                                                    
3156 
3157 
3158 
3159 void LIRGenerator::do_Intrinsic(Intrinsic* x) {                                                                                      
3160   switch (x->id()) {                                                                                                                 
3161   case vmIntrinsics::_intBitsToFloat      :                                                                                          
3162   case vmIntrinsics::_doubleToRawLongBits :                                                                                          
3163   case vmIntrinsics::_longBitsToDouble    :                                                                                          
3164   case vmIntrinsics::_floatToRawIntBits   : {                                                                                        
3165     do_FPIntrinsics(x);                                                                                                              
3166     break;                                                                                                                           
3167   }                                                                                                                                  
3168 
3169 #ifdef TRACE_HAVE_INTRINSICS                                                                                                         
3170   case vmIntrinsics::_getClassId:                                                                                                    
3171     do_ClassIDIntrinsic(x);                                                                                                          
3172     break;                                                                                                                           
3173   case vmIntrinsics::_getBufferWriter:                                                                                               
3174     do_getBufferWriter(x);                                                                                                           
3175     break;                                                                                                                           
3176   case vmIntrinsics::_counterTime:                                                                                                   
3177     do_RuntimeCall(CAST_FROM_FN_PTR(address, TRACE_TIME_METHOD), x);                                                                 
3178     break;                                                                                                                           
3179 #endif                                                                                                                               
3180 
3181   case vmIntrinsics::_currentTimeMillis:                                                                                             
3182     do_RuntimeCall(CAST_FROM_FN_PTR(address, os::javaTimeMillis), x);                                                                
3183     break;                                                                                                                           
3184 
3185   case vmIntrinsics::_nanoTime:                                                                                                      
3186     do_RuntimeCall(CAST_FROM_FN_PTR(address, os::javaTimeNanos), x);                                                                 
3187     break;                                                                                                                           
3188 
3189   case vmIntrinsics::_Object_init:    do_RegisterFinalizer(x); break;                                                                
3190   case vmIntrinsics::_isInstance:     do_isInstance(x);    break;                                                                    
3191   case vmIntrinsics::_isPrimitive:    do_isPrimitive(x);   break;                                                                    
3192   case vmIntrinsics::_getClass:       do_getClass(x);      break;                                                                    
3193   case vmIntrinsics::_currentThread:  do_currentThread(x); break;                                                                    
3194 
3195   case vmIntrinsics::_dlog:           // fall through                                                                                
3196   case vmIntrinsics::_dlog10:         // fall through                                                                                
3197   case vmIntrinsics::_dabs:           // fall through                                                                                
3198   case vmIntrinsics::_dsqrt:          // fall through                                                                                
3199   case vmIntrinsics::_dtan:           // fall through                                                                                
3200   case vmIntrinsics::_dsin :          // fall through                                                                                
3201   case vmIntrinsics::_dcos :          // fall through                                                                                
3202   case vmIntrinsics::_dexp :          // fall through                                                                                
3203   case vmIntrinsics::_dpow :          do_MathIntrinsic(x); break;                                                                    
3204   case vmIntrinsics::_arraycopy:      do_ArrayCopy(x);     break;                                                                    
3205 
3206   case vmIntrinsics::_fmaD:           do_FmaIntrinsic(x); break;                                                                     
3207   case vmIntrinsics::_fmaF:           do_FmaIntrinsic(x); break;                                                                     
3208 
3209   // java.nio.Buffer.checkIndex                                                                                                      
3210   case vmIntrinsics::_checkIndex:     do_NIOCheckIndex(x); break;                                                                    
3211 
3212   case vmIntrinsics::_compareAndSetObject:                                                                                           
3213     do_CompareAndSwap(x, objectType);                                                                                                
3214     break;                                                                                                                           
3215   case vmIntrinsics::_compareAndSetInt:                                                                                              
3216     do_CompareAndSwap(x, intType);                                                                                                   
3217     break;                                                                                                                           
3218   case vmIntrinsics::_compareAndSetLong:                                                                                             
3219     do_CompareAndSwap(x, longType);                                                                                                  
3220     break;                                                                                                                           
3221 
3222   case vmIntrinsics::_loadFence :                                                                                                    
3223     if (os::is_MP()) __ membar_acquire();                                                                                            
3224     break;                                                                                                                           
3225   case vmIntrinsics::_storeFence:                                                                                                    
3226     if (os::is_MP()) __ membar_release();                                                                                            
3227     break;                                                                                                                           
3228   case vmIntrinsics::_fullFence :                                                                                                    
3229     if (os::is_MP()) __ membar();                                                                                                    
3230     break;                                                                                                                           
3231   case vmIntrinsics::_onSpinWait:                                                                                                    
3232     __ on_spin_wait();                                                                                                               
3233     break;                                                                                                                           
3234   case vmIntrinsics::_Reference_get:                                                                                                 
3235     do_Reference_get(x);                                                                                                             
3236     break;                                                                                                                           
3237 
3238   case vmIntrinsics::_updateCRC32:                                                                                                   
3239   case vmIntrinsics::_updateBytesCRC32:                                                                                              
3240   case vmIntrinsics::_updateByteBufferCRC32:                                                                                         
3241     do_update_CRC32(x);                                                                                                              
3242     break;                                                                                                                           
3243 
3244   case vmIntrinsics::_updateBytesCRC32C:                                                                                             
3245   case vmIntrinsics::_updateDirectByteBufferCRC32C:                                                                                  
3246     do_update_CRC32C(x);                                                                                                             
3247     break;                                                                                                                           
3248 
3249   case vmIntrinsics::_vectorizedMismatch:                                                                                            
3250     do_vectorizedMismatch(x);                                                                                                        
3251     break;                                                                                                                           
3252 
3253   default: ShouldNotReachHere(); break;                                                                                              
3254   }                                                                                                                                  
3255 }                                                                                                                                    
3256 
3257 void LIRGenerator::profile_arguments(ProfileCall* x) {                                                                               
3258   if (compilation()->profile_arguments()) {                                                                                          
3259     int bci = x->bci_of_invoke();                                                                                                    
3260     ciMethodData* md = x->method()->method_data_or_null();                                                                           
3261     ciProfileData* data = md->bci_to_data(bci);                                                                                      
3262     if (data != NULL) {                                                                                                              
3263       if ((data->is_CallTypeData() && data->as_CallTypeData()->has_arguments()) ||                                                   
3264           (data->is_VirtualCallTypeData() && data->as_VirtualCallTypeData()->has_arguments())) {                                     
3265         ByteSize extra = data->is_CallTypeData() ? CallTypeData::args_data_offset() : VirtualCallTypeData::args_data_offset();       
3266         int base_offset = md->byte_offset_of_slot(data, extra);                                                                      
3267         LIR_Opr mdp = LIR_OprFact::illegalOpr;                                                                                       
3268         ciTypeStackSlotEntries* args = data->is_CallTypeData() ? ((ciCallTypeData*)data)->args() : ((ciVirtualCallTypeData*)data)->ar
3269 
3270         Bytecodes::Code bc = x->method()->java_code_at_bci(bci);                                                                     
3271         int start = 0;                                                                                                               
3272         int stop = data->is_CallTypeData() ? ((ciCallTypeData*)data)->number_of_arguments() : ((ciVirtualCallTypeData*)data)->number_
3273         if (x->callee()->is_loaded() && x->callee()->is_static() && Bytecodes::has_receiver(bc)) {                                   
3274           // first argument is not profiled at call (method handle invoke)                                                           
3275           assert(x->method()->raw_code_at_bci(bci) == Bytecodes::_invokehandle, "invokehandle expected");                            
3276           start = 1;                                                                                                                 
3277         }                                                                                                                            
3278         ciSignature* callee_signature = x->callee()->signature();                                                                    
3279         // method handle call to virtual method                                                                                      
3280         bool has_receiver = x->callee()->is_loaded() && !x->callee()->is_static() && !Bytecodes::has_receiver(bc);                   
3281         ciSignatureStream callee_signature_stream(callee_signature, has_receiver ? x->callee()->holder() : NULL);                    
3282 
3283         bool ignored_will_link;                                                                                                      
3284         ciSignature* signature_at_call = NULL;                                                                                       
3285         x->method()->get_method_at_bci(bci, ignored_will_link, &signature_at_call);                                                  
3286         ciSignatureStream signature_at_call_stream(signature_at_call);                                                               
3287 
3288         // if called through method handle invoke, some arguments may have been popped                                               
3289         for (int i = 0; i < stop && i+start < x->nb_profiled_args(); i++) {                                                          
3290           int off = in_bytes(TypeEntriesAtCall::argument_type_offset(i)) - in_bytes(TypeEntriesAtCall::args_data_offset());          
3291           ciKlass* exact = profile_type(md, base_offset, off,                                                                        
3292               args->type(i), x->profiled_arg_at(i+start), mdp,                                                                       
3293               !x->arg_needs_null_check(i+start),                                                                                     
3294               signature_at_call_stream.next_klass(), callee_signature_stream.next_klass());                                          
3295           if (exact != NULL) {                                                                                                       
3296             md->set_argument_type(bci, i, exact);                                                                                    
3297           }                                                                                                                          
3298         }                                                                                                                            
3299       } else {                                                                                                                       
3300 #ifdef ASSERT                                                                                                                        
3301         Bytecodes::Code code = x->method()->raw_code_at_bci(x->bci_of_invoke());                                                     
3302         int n = x->nb_profiled_args();                                                                                               
3303         assert(MethodData::profile_parameters() && (MethodData::profile_arguments_jsr292_only() ||                                   
3304             (x->inlined() && ((code == Bytecodes::_invokedynamic && n <= 1) || (code == Bytecodes::_invokehandle && n <= 2)))),      
3305             "only at JSR292 bytecodes");                                                                                             
3306 #endif                                                                                                                               
3307       }                                                                                                                              
3308     }                                                                                                                                
3309   }                                                                                                                                  
3310 }                                                                                                                                    
3311 
3312 // profile parameters on entry to an inlined method                                                                                  
3313 void LIRGenerator::profile_parameters_at_call(ProfileCall* x) {                                                                      
3314   if (compilation()->profile_parameters() && x->inlined()) {                                                                         
3315     ciMethodData* md = x->callee()->method_data_or_null();                                                                           
3316     if (md != NULL) {                                                                                                                
3317       ciParametersTypeData* parameters_type_data = md->parameters_type_data();                                                       
3318       if (parameters_type_data != NULL) {                                                                                            
3319         ciTypeStackSlotEntries* parameters =  parameters_type_data->parameters();                                                    
3320         LIR_Opr mdp = LIR_OprFact::illegalOpr;                                                                                       
3321         bool has_receiver = !x->callee()->is_static();                                                                               
3322         ciSignature* sig = x->callee()->signature();                                                                                 
3323         ciSignatureStream sig_stream(sig, has_receiver ? x->callee()->holder() : NULL);                                              
3324         int i = 0; // to iterate on the Instructions                                                                                 
3325         Value arg = x->recv();                                                                                                       
3326         bool not_null = false;                                                                                                       
3327         int bci = x->bci_of_invoke();                                                                                                
3328         Bytecodes::Code bc = x->method()->java_code_at_bci(bci);                                                                     
3329         // The first parameter is the receiver so that's what we start                                                               
3330         // with if it exists. One exception is method handle call to                                                                 
3331         // virtual method: the receiver is in the args list                                                                          
3332         if (arg == NULL || !Bytecodes::has_receiver(bc)) {                                                                           
3333           i = 1;                                                                                                                     
3334           arg = x->profiled_arg_at(0);                                                                                               
3335           not_null = !x->arg_needs_null_check(0);                                                                                    
3336         }                                                                                                                            
3337         int k = 0; // to iterate on the profile data                                                                                 
3338         for (;;) {                                                                                                                   
3339           intptr_t profiled_k = parameters->type(k);                                                                                 
3340           ciKlass* exact = profile_type(md, md->byte_offset_of_slot(parameters_type_data, ParametersTypeData::type_offset(0)),       
3341                                         in_bytes(ParametersTypeData::type_offset(k)) - in_bytes(ParametersTypeData::type_offset(0)), 
3342                                         profiled_k, arg, mdp, not_null, sig_stream.next_klass(), NULL);                              
3343           // If the profile is known statically set it once for all and do not emit any code                                         
3344           if (exact != NULL) {                                                                                                       
3345             md->set_parameter_type(k, exact);                                                                                        
3346           }                                                                                                                          
3347           k++;                                                                                                                       
3348           if (k >= parameters_type_data->number_of_parameters()) {                                                                   
3349 #ifdef ASSERT                                                                                                                        
3350             int extra = 0;                                                                                                           
3351             if (MethodData::profile_arguments() && TypeProfileParmsLimit != -1 &&                                                    
3352                 x->nb_profiled_args() >= TypeProfileParmsLimit &&                                                                    
3353                 x->recv() != NULL && Bytecodes::has_receiver(bc)) {                                                                  
3354               extra += 1;                                                                                                            
3355             }                                                                                                                        
3356             assert(i == x->nb_profiled_args() - extra || (TypeProfileParmsLimit != -1 && TypeProfileArgsLimit > TypeProfileParmsLimit
3357 #endif                                                                                                                               
3358             break;                                                                                                                   
3359           }                                                                                                                          
3360           arg = x->profiled_arg_at(i);                                                                                               
3361           not_null = !x->arg_needs_null_check(i);                                                                                    
3362           i++;                                                                                                                       
3363         }                                                                                                                            
3364       }                                                                                                                              
3365     }                                                                                                                                
3366   }                                                                                                                                  
3367 }                                                                                                                                    
3368 
3369 void LIRGenerator::do_ProfileCall(ProfileCall* x) {                                                                                  
3370   // Need recv in a temporary register so it interferes with the other temporaries                                                   
3371   LIR_Opr recv = LIR_OprFact::illegalOpr;                                                                                            
3372   LIR_Opr mdo = new_register(T_OBJECT);                                                                                              
3373   // tmp is used to hold the counters on SPARC                                                                                       
3374   LIR_Opr tmp = new_pointer_register();                                                                                              
3375 
3376   if (x->nb_profiled_args() > 0) {                                                                                                   
3377     profile_arguments(x);                                                                                                            
3378   }                                                                                                                                  
3379 
3380   // profile parameters on inlined method entry including receiver                                                                   
3381   if (x->recv() != NULL || x->nb_profiled_args() > 0) {                                                                              
3382     profile_parameters_at_call(x);                                                                                                   
3383   }                                                                                                                                  
3384 
3385   if (x->recv() != NULL) {                                                                                                           
3386     LIRItem value(x->recv(), this);                                                                                                  
3387     value.load_item();                                                                                                               
3388     recv = new_register(T_OBJECT);                                                                                                   
3389     __ move(value.result(), recv);                                                                                                   
3390   }                                                                                                                                  
3391   __ profile_call(x->method(), x->bci_of_invoke(), x->callee(), mdo, recv, tmp, x->known_holder());                                  
3392 }                                                                                                                                    
3393 
3394 void LIRGenerator::do_ProfileReturnType(ProfileReturnType* x) {                                                                      
3395   int bci = x->bci_of_invoke();                                                                                                      
3396   ciMethodData* md = x->method()->method_data_or_null();                                                                             
3397   ciProfileData* data = md->bci_to_data(bci);                                                                                        
3398   if (data != NULL) {                                                                                                                
3399     assert(data->is_CallTypeData() || data->is_VirtualCallTypeData(), "wrong profile data type");                                    
3400     ciReturnTypeEntry* ret = data->is_CallTypeData() ? ((ciCallTypeData*)data)->ret() : ((ciVirtualCallTypeData*)data)->ret();       
3401     LIR_Opr mdp = LIR_OprFact::illegalOpr;                                                                                           
3402 
3403     bool ignored_will_link;                                                                                                          
3404     ciSignature* signature_at_call = NULL;                                                                                           
3405     x->method()->get_method_at_bci(bci, ignored_will_link, &signature_at_call);                                                      
3406 
3407     // The offset within the MDO of the entry to update may be too large                                                             
3408     // to be used in load/store instructions on some platforms. So have                                                              
3409     // profile_type() compute the address of the profile in a register.                                                              
3410     ciKlass* exact = profile_type(md, md->byte_offset_of_slot(data, ret->type_offset()), 0,                                          
3411         ret->type(), x->ret(), mdp,                                                                                                  
3412         !x->needs_null_check(),                                                                                                      
3413         signature_at_call->return_type()->as_klass(),                                                                                
3414         x->callee()->signature()->return_type()->as_klass());                                                                        
3415     if (exact != NULL) {                                                                                                             
3416       md->set_return_type(bci, exact);                                                                                               
3417     }                                                                                                                                
3418   }                                                                                                                                  
3419 }                                                                                                                                    
3420 
3421 void LIRGenerator::do_ProfileInvoke(ProfileInvoke* x) {                                                                              
3422   // We can safely ignore accessors here, since c2 will inline them anyway,                                                          
3423   // accessors are also always mature.                                                                                               
3424   if (!x->inlinee()->is_accessor()) {                                                                                                
3425     CodeEmitInfo* info = state_for(x, x->state(), true);                                                                             
3426     // Notify the runtime very infrequently only to take care of counter overflows                                                   
3427     int freq_log = Tier23InlineeNotifyFreqLog;                                                                                       
3428     double scale;                                                                                                                    
3429     if (_method->has_option_value("CompileThresholdScaling", scale)) {                                                               
3430       freq_log = Arguments::scaled_freq_log(freq_log, scale);                                                                        
3431     }                                                                                                                                
3432     increment_event_counter_impl(info, x->inlinee(), right_n_bits(freq_log), InvocationEntryBci, false, true);                       
3433   }                                                                                                                                  
3434 }                                                                                                                                    
3435 
3436 void LIRGenerator::increment_event_counter(CodeEmitInfo* info, int bci, bool backedge) {                                             
3437   int freq_log = 0;                                                                                                                  
3438   int level = compilation()->env()->comp_level();                                                                                    
3439   if (level == CompLevel_limited_profile) {                                                                                          
3440     freq_log = (backedge ? Tier2BackedgeNotifyFreqLog : Tier2InvokeNotifyFreqLog);                                                   
3441   } else if (level == CompLevel_full_profile) {                                                                                      
3442     freq_log = (backedge ? Tier3BackedgeNotifyFreqLog : Tier3InvokeNotifyFreqLog);                                                   
3443   } else {                                                                                                                           
3444     ShouldNotReachHere();                                                                                                            
3445   }                                                                                                                                  
3446   // Increment the appropriate invocation/backedge counter and notify the runtime.                                                   
3447   double scale;                                                                                                                      
3448   if (_method->has_option_value("CompileThresholdScaling", scale)) {                                                                 
3449     freq_log = Arguments::scaled_freq_log(freq_log, scale);                                                                          
3450   }                                                                                                                                  
3451   increment_event_counter_impl(info, info->scope()->method(), right_n_bits(freq_log), bci, backedge, true);                          
3452 }                                                                                                                                    
3453 
3454 void LIRGenerator::decrement_age(CodeEmitInfo* info) {                                                                               
3455   ciMethod* method = info->scope()->method();                                                                                        
3456   MethodCounters* mc_adr = method->ensure_method_counters();                                                                         
3457   if (mc_adr != NULL) {                                                                                                              
3458     LIR_Opr mc = new_pointer_register();                                                                                             
3459     __ move(LIR_OprFact::intptrConst(mc_adr), mc);                                                                                   
3460     int offset = in_bytes(MethodCounters::nmethod_age_offset());                                                                     
3461     LIR_Address* counter = new LIR_Address(mc, offset, T_INT);                                                                       
3462     LIR_Opr result = new_register(T_INT);                                                                                            
3463     __ load(counter, result);                                                                                                        
3464     __ sub(result, LIR_OprFact::intConst(1), result);                                                                                
3465     __ store(result, counter);                                                                                                       
3466     // DeoptimizeStub will reexecute from the current state in code info.                                                            
3467     CodeStub* deopt = new DeoptimizeStub(info, Deoptimization::Reason_tenured,                                                       
3468                                          Deoptimization::Action_make_not_entrant);                                                   
3469     __ cmp(lir_cond_lessEqual, result, LIR_OprFact::intConst(0));                                                                    
3470     __ branch(lir_cond_lessEqual, T_INT, deopt);                                                                                     
3471   }                                                                                                                                  
3472 }                                                                                                                                    
3473 
3474 
3475 void LIRGenerator::increment_event_counter_impl(CodeEmitInfo* info,                                                                  
3476                                                 ciMethod *method, int frequency,                                                     
3477                                                 int bci, bool backedge, bool notify) {                                               
3478   assert(frequency == 0 || is_power_of_2(frequency + 1), "Frequency must be x^2 - 1 or 0");                                          
3479   int level = _compilation->env()->comp_level();                                                                                     
3480   assert(level > CompLevel_simple, "Shouldn't be here");                                                                             
3481 
3482   int offset = -1;                                                                                                                   
3483   LIR_Opr counter_holder = NULL;                                                                                                     
3484   if (level == CompLevel_limited_profile) {                                                                                          
3485     MethodCounters* counters_adr = method->ensure_method_counters();                                                                 
3486     if (counters_adr == NULL) {                                                                                                      
3487       bailout("method counters allocation failed");                                                                                  
3488       return;                                                                                                                        
3489     }                                                                                                                                
3490     counter_holder = new_pointer_register();                                                                                         
3491     __ move(LIR_OprFact::intptrConst(counters_adr), counter_holder);                                                                 
3492     offset = in_bytes(backedge ? MethodCounters::backedge_counter_offset() :                                                         
3493                                  MethodCounters::invocation_counter_offset());                                                       
3494   } else if (level == CompLevel_full_profile) {                                                                                      
3495     counter_holder = new_register(T_METADATA);                                                                                       
3496     offset = in_bytes(backedge ? MethodData::backedge_counter_offset() :                                                             
3497                                  MethodData::invocation_counter_offset());                                                           
3498     ciMethodData* md = method->method_data_or_null();                                                                                
3499     assert(md != NULL, "Sanity");                                                                                                    
3500     __ metadata2reg(md->constant_encoding(), counter_holder);                                                                        
3501   } else {                                                                                                                           
3502     ShouldNotReachHere();                                                                                                            
3503   }                                                                                                                                  
3504   LIR_Address* counter = new LIR_Address(counter_holder, offset, T_INT);                                                             
3505   LIR_Opr result = new_register(T_INT);                                                                                              
3506   __ load(counter, result);                                                                                                          
3507   __ add(result, LIR_OprFact::intConst(InvocationCounter::count_increment), result);                                                 
3508   __ store(result, counter);                                                                                                         
3509   if (notify && (!backedge || UseOnStackReplacement)) {                                                                              
3510     LIR_Opr meth = LIR_OprFact::metadataConst(method->constant_encoding());                                                          
3511     // The bci for info can point to cmp for if's we want the if bci                                                                 
3512     CodeStub* overflow = new CounterOverflowStub(info, bci, meth);                                                                   
3513     int freq = frequency << InvocationCounter::count_shift;                                                                          
3514     if (freq == 0) {                                                                                                                 
3515       __ branch(lir_cond_always, T_ILLEGAL, overflow);                                                                               
3516     } else {                                                                                                                         
3517       LIR_Opr mask = load_immediate(freq, T_INT);                                                                                    
3518       __ logical_and(result, mask, result);                                                                                          
3519       __ cmp(lir_cond_equal, result, LIR_OprFact::intConst(0));                                                                      
3520       __ branch(lir_cond_equal, T_INT, overflow);                                                                                    
3521     }                                                                                                                                
3522     __ branch_destination(overflow->continuation());                                                                                 
3523   }                                                                                                                                  
3524 }                                                                                                                                    
3525 
3526 void LIRGenerator::do_RuntimeCall(RuntimeCall* x) {                                                                                  
3527   LIR_OprList* args = new LIR_OprList(x->number_of_arguments());                                                                     
3528   BasicTypeList* signature = new BasicTypeList(x->number_of_arguments());                                                            
3529 
3530   if (x->pass_thread()) {                                                                                                            
3531     signature->append(LP64_ONLY(T_LONG) NOT_LP64(T_INT));    // thread                                                               
3532     args->append(getThreadPointer());                                                                                                
3533   }                                                                                                                                  
3534 
3535   for (int i = 0; i < x->number_of_arguments(); i++) {                                                                               
3536     Value a = x->argument_at(i);                                                                                                     
3537     LIRItem* item = new LIRItem(a, this);                                                                                            
3538     item->load_item();                                                                                                               
3539     args->append(item->result());                                                                                                    
3540     signature->append(as_BasicType(a->type()));                                                                                      
3541   }                                                                                                                                  
3542 
3543   LIR_Opr result = call_runtime(signature, args, x->entry(), x->type(), NULL);                                                       
3544   if (x->type() == voidType) {                                                                                                       
3545     set_no_result(x);                                                                                                                
3546   } else {                                                                                                                           
3547     __ move(result, rlock_result(x));                                                                                                
3548   }                                                                                                                                  
3549 }                                                                                                                                    
3550 
3551 #ifdef ASSERT                                                                                                                        
3552 void LIRGenerator::do_Assert(Assert *x) {                                                                                            
3553   ValueTag tag = x->x()->type()->tag();                                                                                              
3554   If::Condition cond = x->cond();                                                                                                    
3555 
3556   LIRItem xitem(x->x(), this);                                                                                                       
3557   LIRItem yitem(x->y(), this);                                                                                                       
3558   LIRItem* xin = &xitem;                                                                                                             
3559   LIRItem* yin = &yitem;                                                                                                             
3560 
3561   assert(tag == intTag, "Only integer assertions are valid!");                                                                       
3562 
3563   xin->load_item();                                                                                                                  
3564   yin->dont_load_item();                                                                                                             
3565 
3566   set_no_result(x);                                                                                                                  
3567 
3568   LIR_Opr left = xin->result();                                                                                                      
3569   LIR_Opr right = yin->result();                                                                                                     
3570 
3571   __ lir_assert(lir_cond(x->cond()), left, right, x->message(), true);                                                               
3572 }                                                                                                                                    
3573 #endif                                                                                                                               
3574 
3575 void LIRGenerator::do_RangeCheckPredicate(RangeCheckPredicate *x) {                                                                  
3576 
3577 
3578   Instruction *a = x->x();                                                                                                           
3579   Instruction *b = x->y();                                                                                                           
3580   if (!a || StressRangeCheckElimination) {                                                                                           
3581     assert(!b || StressRangeCheckElimination, "B must also be null");                                                                
3582 
3583     CodeEmitInfo *info = state_for(x, x->state());                                                                                   
3584     CodeStub* stub = new PredicateFailedStub(info);                                                                                  
3585 
3586     __ jump(stub);                                                                                                                   
3587   } else if (a->type()->as_IntConstant() && b->type()->as_IntConstant()) {                                                           
3588     int a_int = a->type()->as_IntConstant()->value();                                                                                
3589     int b_int = b->type()->as_IntConstant()->value();                                                                                
3590 
3591     bool ok = false;                                                                                                                 
3592 
3593     switch(x->cond()) {                                                                                                              
3594       case Instruction::eql: ok = (a_int == b_int); break;                                                                           
3595       case Instruction::neq: ok = (a_int != b_int); break;                                                                           
3596       case Instruction::lss: ok = (a_int < b_int); break;                                                                            
3597       case Instruction::leq: ok = (a_int <= b_int); break;                                                                           
3598       case Instruction::gtr: ok = (a_int > b_int); break;                                                                            
3599       case Instruction::geq: ok = (a_int >= b_int); break;                                                                           
3600       case Instruction::aeq: ok = ((unsigned int)a_int >= (unsigned int)b_int); break;                                               
3601       case Instruction::beq: ok = ((unsigned int)a_int <= (unsigned int)b_int); break;                                               
3602       default: ShouldNotReachHere();                                                                                                 
3603     }                                                                                                                                
3604 
3605     if (ok) {                                                                                                                        
3606 
3607       CodeEmitInfo *info = state_for(x, x->state());                                                                                 
3608       CodeStub* stub = new PredicateFailedStub(info);                                                                                
3609 
3610       __ jump(stub);                                                                                                                 
3611     }                                                                                                                                
3612   } else {                                                                                                                           
3613 
3614     ValueTag tag = x->x()->type()->tag();                                                                                            
3615     If::Condition cond = x->cond();                                                                                                  
3616     LIRItem xitem(x->x(), this);                                                                                                     
3617     LIRItem yitem(x->y(), this);                                                                                                     
3618     LIRItem* xin = &xitem;                                                                                                           
3619     LIRItem* yin = &yitem;                                                                                                           
3620 
3621     assert(tag == intTag, "Only integer deoptimizations are valid!");                                                                
3622 
3623     xin->load_item();                                                                                                                
3624     yin->dont_load_item();                                                                                                           
3625     set_no_result(x);                                                                                                                
3626 
3627     LIR_Opr left = xin->result();                                                                                                    
3628     LIR_Opr right = yin->result();                                                                                                   
3629 
3630     CodeEmitInfo *info = state_for(x, x->state());                                                                                   
3631     CodeStub* stub = new PredicateFailedStub(info);                                                                                  
3632 
3633     __ cmp(lir_cond(cond), left, right);                                                                                             
3634     __ branch(lir_cond(cond), right->type(), stub);                                                                                  
3635   }                                                                                                                                  
3636 }                                                                                                                                    
3637 
3638 
3639 LIR_Opr LIRGenerator::call_runtime(Value arg1, address entry, ValueType* result_type, CodeEmitInfo* info) {                          
3640   LIRItemList args(1);                                                                                                               
3641   LIRItem value(arg1, this);                                                                                                         
3642   args.append(&value);                                                                                                               
3643   BasicTypeList signature;                                                                                                           
3644   signature.append(as_BasicType(arg1->type()));                                                                                      
3645 
3646   return call_runtime(&signature, &args, entry, result_type, info);                                                                  
3647 }                                                                                                                                    
3648 
3649 
3650 LIR_Opr LIRGenerator::call_runtime(Value arg1, Value arg2, address entry, ValueType* result_type, CodeEmitInfo* info) {              
3651   LIRItemList args(2);                                                                                                               
3652   LIRItem value1(arg1, this);                                                                                                        
3653   LIRItem value2(arg2, this);                                                                                                        
3654   args.append(&value1);                                                                                                              
3655   args.append(&value2);                                                                                                              
3656   BasicTypeList signature;                                                                                                           
3657   signature.append(as_BasicType(arg1->type()));                                                                                      
3658   signature.append(as_BasicType(arg2->type()));                                                                                      
3659 
3660   return call_runtime(&signature, &args, entry, result_type, info);                                                                  
3661 }                                                                                                                                    
3662 
3663 
3664 LIR_Opr LIRGenerator::call_runtime(BasicTypeArray* signature, LIR_OprList* args,                                                     
3665                                    address entry, ValueType* result_type, CodeEmitInfo* info) {                                      
3666   // get a result register                                                                                                           
3667   LIR_Opr phys_reg = LIR_OprFact::illegalOpr;                                                                                        
3668   LIR_Opr result = LIR_OprFact::illegalOpr;                                                                                          
3669   if (result_type->tag() != voidTag) {                                                                                               
3670     result = new_register(result_type);                                                                                              
3671     phys_reg = result_register_for(result_type);                                                                                     
3672   }                                                                                                                                  
3673 
3674   // move the arguments into the correct location                                                                                    
3675   CallingConvention* cc = frame_map()->c_calling_convention(signature);                                                              
3676   assert(cc->length() == args->length(), "argument mismatch");                                                                       
3677   for (int i = 0; i < args->length(); i++) {                                                                                         
3678     LIR_Opr arg = args->at(i);                                                                                                       
3679     LIR_Opr loc = cc->at(i);                                                                                                         
3680     if (loc->is_register()) {                                                                                                        
3681       __ move(arg, loc);                                                                                                             
3682     } else {                                                                                                                         
3683       LIR_Address* addr = loc->as_address_ptr();                                                                                     
3684 //           if (!can_store_as_constant(arg)) {                                                                                      
3685 //             LIR_Opr tmp = new_register(arg->type());                                                                              
3686 //             __ move(arg, tmp);                                                                                                    
3687 //             arg = tmp;                                                                                                            
3688 //           }                                                                                                                       
3689       if (addr->type() == T_LONG || addr->type() == T_DOUBLE) {                                                                      
3690         __ unaligned_move(arg, addr);                                                                                                
3691       } else {                                                                                                                       
3692         __ move(arg, addr);                                                                                                          
3693       }                                                                                                                              
3694     }                                                                                                                                
3695   }                                                                                                                                  
3696 
3697   if (info) {                                                                                                                        
3698     __ call_runtime(entry, getThreadTemp(), phys_reg, cc->args(), info);                                                             
3699   } else {                                                                                                                           
3700     __ call_runtime_leaf(entry, getThreadTemp(), phys_reg, cc->args());                                                              
3701   }                                                                                                                                  
3702   if (result->is_valid()) {                                                                                                          
3703     __ move(phys_reg, result);                                                                                                       
3704   }                                                                                                                                  
3705   return result;                                                                                                                     
3706 }                                                                                                                                    
3707 
3708 
3709 LIR_Opr LIRGenerator::call_runtime(BasicTypeArray* signature, LIRItemList* args,                                                     
3710                                    address entry, ValueType* result_type, CodeEmitInfo* info) {                                      
3711   // get a result register                                                                                                           
3712   LIR_Opr phys_reg = LIR_OprFact::illegalOpr;                                                                                        
3713   LIR_Opr result = LIR_OprFact::illegalOpr;                                                                                          
3714   if (result_type->tag() != voidTag) {                                                                                               
3715     result = new_register(result_type);                                                                                              
3716     phys_reg = result_register_for(result_type);                                                                                     
3717   }                                                                                                                                  
3718 
3719   // move the arguments into the correct location                                                                                    
3720   CallingConvention* cc = frame_map()->c_calling_convention(signature);                                                              
3721 
3722   assert(cc->length() == args->length(), "argument mismatch");                                                                       
3723   for (int i = 0; i < args->length(); i++) {                                                                                         
3724     LIRItem* arg = args->at(i);                                                                                                      
3725     LIR_Opr loc = cc->at(i);                                                                                                         
3726     if (loc->is_register()) {                                                                                                        
3727       arg->load_item_force(loc);                                                                                                     
3728     } else {                                                                                                                         
3729       LIR_Address* addr = loc->as_address_ptr();                                                                                     
3730       arg->load_for_store(addr->type());                                                                                             
3731       if (addr->type() == T_LONG || addr->type() == T_DOUBLE) {                                                                      
3732         __ unaligned_move(arg->result(), addr);                                                                                      
3733       } else {                                                                                                                       
3734         __ move(arg->result(), addr);                                                                                                
3735       }                                                                                                                              
3736     }                                                                                                                                
3737   }                                                                                                                                  
3738 
3739   if (info) {                                                                                                                        
3740     __ call_runtime(entry, getThreadTemp(), phys_reg, cc->args(), info);                                                             
3741   } else {                                                                                                                           
3742     __ call_runtime_leaf(entry, getThreadTemp(), phys_reg, cc->args());                                                              
3743   }                                                                                                                                  
3744   if (result->is_valid()) {                                                                                                          
3745     __ move(phys_reg, result);                                                                                                       
3746   }                                                                                                                                  
3747   return result;                                                                                                                     
3748 }                                                                                                                                    
3749 
3750 void LIRGenerator::do_MemBar(MemBar* x) {                                                                                            
3751   if (os::is_MP()) {                                                                                                                 
3752     LIR_Code code = x->code();                                                                                                       
3753     switch(code) {                                                                                                                   
3754       case lir_membar_acquire   : __ membar_acquire(); break;                                                                        
3755       case lir_membar_release   : __ membar_release(); break;                                                                        
3756       case lir_membar           : __ membar(); break;                                                                                
3757       case lir_membar_loadload  : __ membar_loadload(); break;                                                                       
3758       case lir_membar_storestore: __ membar_storestore(); break;                                                                     
3759       case lir_membar_loadstore : __ membar_loadstore(); break;                                                                      
3760       case lir_membar_storeload : __ membar_storeload(); break;                                                                      
3761       default                   : ShouldNotReachHere(); break;                                                                       
3762     }                                                                                                                                
3763   }                                                                                                                                  
3764 }                                                                                                                                    
3765 
3766 LIR_Opr LIRGenerator::maybe_mask_boolean(StoreIndexed* x, LIR_Opr array, LIR_Opr value, CodeEmitInfo*& null_check_info) {            
3767   if (x->check_boolean()) {                                                                                                          
3768     LIR_Opr value_fixed = rlock_byte(T_BYTE);                                                                                        
3769     if (TwoOperandLIRForm) {                                                                                                         
3770       __ move(value, value_fixed);                                                                                                   
3771       __ logical_and(value_fixed, LIR_OprFact::intConst(1), value_fixed);                                                            
3772     } else {                                                                                                                         
3773       __ logical_and(value, LIR_OprFact::intConst(1), value_fixed);                                                                  
3774     }                                                                                                                                
3775     LIR_Opr klass = new_register(T_METADATA);                                                                                        
3776     __ move(new LIR_Address(array, oopDesc::klass_offset_in_bytes(), T_ADDRESS), klass, null_check_info);                            
3777     null_check_info = NULL;                                                                                                          
3778     LIR_Opr layout = new_register(T_INT);                                                                                            
3779     __ move(new LIR_Address(klass, in_bytes(Klass::layout_helper_offset()), T_INT), layout);                                         
3780     int diffbit = Klass::layout_helper_boolean_diffbit();                                                                            
3781     __ logical_and(layout, LIR_OprFact::intConst(diffbit), layout);                                                                  
3782     __ cmp(lir_cond_notEqual, layout, LIR_OprFact::intConst(0));                                                                     
3783     __ cmove(lir_cond_notEqual, value_fixed, value, value_fixed, T_BYTE);                                                            
3784     value = value_fixed;                                                                                                             
3785   }                                                                                                                                  
3786   return value;                                                                                                                      
3787 }                                                                                                                                    
--- EOF ---