1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "gc/shared/barrierSet.hpp"
27 #include "gc/shared/c2/barrierSetC2.hpp"
28 #include "memory/allocation.inline.hpp"
29 #include "memory/resourceArea.hpp"
30 #include "oops/compressedOops.hpp"
31 #include "opto/ad.hpp"
32 #include "opto/addnode.hpp"
33 #include "opto/callnode.hpp"
34 #include "opto/idealGraphPrinter.hpp"
35 #include "opto/matcher.hpp"
36 #include "opto/memnode.hpp"
37 #include "opto/movenode.hpp"
38 #include "opto/opcodes.hpp"
39 #include "opto/regmask.hpp"
40 #include "opto/rootnode.hpp"
41 #include "opto/runtime.hpp"
42 #include "opto/type.hpp"
43 #include "opto/vectornode.hpp"
44 #include "runtime/os.hpp"
45 #include "runtime/sharedRuntime.hpp"
46 #include "utilities/align.hpp"
47
48 OptoReg::Name OptoReg::c_frame_pointer;
49
50 const RegMask *Matcher::idealreg2regmask[_last_machine_leaf];
51 RegMask Matcher::mreg2regmask[_last_Mach_Reg];
52 RegMask Matcher::STACK_ONLY_mask;
53 RegMask Matcher::c_frame_ptr_mask;
54 const uint Matcher::_begin_rematerialize = _BEGIN_REMATERIALIZE;
55 const uint Matcher::_end_rematerialize = _END_REMATERIALIZE;
56
57 //---------------------------Matcher-------------------------------------------
58 Matcher::Matcher()
59 : PhaseTransform( Phase::Ins_Select ),
60 _states_arena(Chunk::medium_size, mtCompiler),
61 _visited(&_states_arena),
62 _shared(&_states_arena),
63 _dontcare(&_states_arena),
64 _reduceOp(reduceOp), _leftOp(leftOp), _rightOp(rightOp),
65 _swallowed(swallowed),
66 _begin_inst_chain_rule(_BEGIN_INST_CHAIN_RULE),
67 _end_inst_chain_rule(_END_INST_CHAIN_RULE),
68 _must_clone(must_clone),
69 _shared_nodes(C->comp_arena()),
70 #ifdef ASSERT
71 _old2new_map(C->comp_arena()),
72 _new2old_map(C->comp_arena()),
73 #endif
74 _allocation_started(false),
75 _ruleName(ruleName),
76 _register_save_policy(register_save_policy),
77 _c_reg_save_policy(c_reg_save_policy),
78 _register_save_type(register_save_type) {
79 C->set_matcher(this);
80
81 idealreg2spillmask [Op_RegI] = NULL;
82 idealreg2spillmask [Op_RegN] = NULL;
83 idealreg2spillmask [Op_RegL] = NULL;
84 idealreg2spillmask [Op_RegF] = NULL;
85 idealreg2spillmask [Op_RegD] = NULL;
86 idealreg2spillmask [Op_RegP] = NULL;
87 idealreg2spillmask [Op_VecS] = NULL;
88 idealreg2spillmask [Op_VecD] = NULL;
89 idealreg2spillmask [Op_VecX] = NULL;
90 idealreg2spillmask [Op_VecY] = NULL;
91 idealreg2spillmask [Op_VecZ] = NULL;
92 idealreg2spillmask [Op_RegFlags] = NULL;
93
94 idealreg2debugmask [Op_RegI] = NULL;
95 idealreg2debugmask [Op_RegN] = NULL;
96 idealreg2debugmask [Op_RegL] = NULL;
97 idealreg2debugmask [Op_RegF] = NULL;
98 idealreg2debugmask [Op_RegD] = NULL;
99 idealreg2debugmask [Op_RegP] = NULL;
100 idealreg2debugmask [Op_VecS] = NULL;
101 idealreg2debugmask [Op_VecD] = NULL;
102 idealreg2debugmask [Op_VecX] = NULL;
103 idealreg2debugmask [Op_VecY] = NULL;
104 idealreg2debugmask [Op_VecZ] = NULL;
105 idealreg2debugmask [Op_RegFlags] = NULL;
106
107 idealreg2mhdebugmask[Op_RegI] = NULL;
108 idealreg2mhdebugmask[Op_RegN] = NULL;
109 idealreg2mhdebugmask[Op_RegL] = NULL;
110 idealreg2mhdebugmask[Op_RegF] = NULL;
111 idealreg2mhdebugmask[Op_RegD] = NULL;
112 idealreg2mhdebugmask[Op_RegP] = NULL;
113 idealreg2mhdebugmask[Op_VecS] = NULL;
114 idealreg2mhdebugmask[Op_VecD] = NULL;
115 idealreg2mhdebugmask[Op_VecX] = NULL;
116 idealreg2mhdebugmask[Op_VecY] = NULL;
117 idealreg2mhdebugmask[Op_VecZ] = NULL;
118 idealreg2mhdebugmask[Op_RegFlags] = NULL;
119
120 debug_only(_mem_node = NULL;) // Ideal memory node consumed by mach node
121 }
122
123 //------------------------------warp_incoming_stk_arg------------------------
124 // This warps a VMReg into an OptoReg::Name
125 OptoReg::Name Matcher::warp_incoming_stk_arg( VMReg reg ) {
126 OptoReg::Name warped;
127 if( reg->is_stack() ) { // Stack slot argument?
128 warped = OptoReg::add(_old_SP, reg->reg2stack() );
129 warped = OptoReg::add(warped, C->out_preserve_stack_slots());
130 if( warped >= _in_arg_limit )
131 _in_arg_limit = OptoReg::add(warped, 1); // Bump max stack slot seen
132 if (!RegMask::can_represent_arg(warped)) {
133 // the compiler cannot represent this method's calling sequence
134 C->record_method_not_compilable("unsupported incoming calling sequence");
135 return OptoReg::Bad;
136 }
137 return warped;
138 }
139 return OptoReg::as_OptoReg(reg);
140 }
141
142 //---------------------------compute_old_SP------------------------------------
143 OptoReg::Name Compile::compute_old_SP() {
144 int fixed = fixed_slots();
145 int preserve = in_preserve_stack_slots();
146 return OptoReg::stack2reg(align_up(fixed + preserve, (int)Matcher::stack_alignment_in_slots()));
147 }
148
149
150
151 #ifdef ASSERT
152 void Matcher::verify_new_nodes_only(Node* xroot) {
153 // Make sure that the new graph only references new nodes
154 ResourceMark rm;
155 Unique_Node_List worklist;
156 VectorSet visited(Thread::current()->resource_area());
157 worklist.push(xroot);
158 while (worklist.size() > 0) {
159 Node* n = worklist.pop();
160 visited <<= n->_idx;
161 assert(C->node_arena()->contains(n), "dead node");
162 for (uint j = 0; j < n->req(); j++) {
163 Node* in = n->in(j);
164 if (in != NULL) {
165 assert(C->node_arena()->contains(in), "dead node");
166 if (!visited.test(in->_idx)) {
167 worklist.push(in);
168 }
169 }
170 }
171 }
172 }
173 #endif
174
175
176 //---------------------------match---------------------------------------------
177 void Matcher::match( ) {
178 if( MaxLabelRootDepth < 100 ) { // Too small?
179 assert(false, "invalid MaxLabelRootDepth, increase it to 100 minimum");
180 MaxLabelRootDepth = 100;
181 }
182 // One-time initialization of some register masks.
183 init_spill_mask( C->root()->in(1) );
184 _return_addr_mask = return_addr();
185 #ifdef _LP64
186 // Pointers take 2 slots in 64-bit land
187 _return_addr_mask.Insert(OptoReg::add(return_addr(),1));
188 #endif
189
190 // Map a Java-signature return type into return register-value
191 // machine registers for 0, 1 and 2 returned values.
192 const TypeTuple *range = C->tf()->range();
193 if( range->cnt() > TypeFunc::Parms ) { // If not a void function
194 // Get ideal-register return type
195 uint ireg = range->field_at(TypeFunc::Parms)->ideal_reg();
196 // Get machine return register
197 uint sop = C->start()->Opcode();
198 OptoRegPair regs = return_value(ireg, false);
199
200 // And mask for same
201 _return_value_mask = RegMask(regs.first());
202 if( OptoReg::is_valid(regs.second()) )
203 _return_value_mask.Insert(regs.second());
204 }
205
206 // ---------------
207 // Frame Layout
208
209 // Need the method signature to determine the incoming argument types,
210 // because the types determine which registers the incoming arguments are
211 // in, and this affects the matched code.
212 const TypeTuple *domain = C->tf()->domain();
213 uint argcnt = domain->cnt() - TypeFunc::Parms;
214 BasicType *sig_bt = NEW_RESOURCE_ARRAY( BasicType, argcnt );
215 VMRegPair *vm_parm_regs = NEW_RESOURCE_ARRAY( VMRegPair, argcnt );
216 _parm_regs = NEW_RESOURCE_ARRAY( OptoRegPair, argcnt );
217 _calling_convention_mask = NEW_RESOURCE_ARRAY( RegMask, argcnt );
218 uint i;
219 for( i = 0; i<argcnt; i++ ) {
220 sig_bt[i] = domain->field_at(i+TypeFunc::Parms)->basic_type();
221 }
222
223 // Pass array of ideal registers and length to USER code (from the AD file)
224 // that will convert this to an array of register numbers.
225 const StartNode *start = C->start();
226 start->calling_convention( sig_bt, vm_parm_regs, argcnt );
227 #ifdef ASSERT
228 // Sanity check users' calling convention. Real handy while trying to
229 // get the initial port correct.
230 { for (uint i = 0; i<argcnt; i++) {
231 if( !vm_parm_regs[i].first()->is_valid() && !vm_parm_regs[i].second()->is_valid() ) {
232 assert(domain->field_at(i+TypeFunc::Parms)==Type::HALF, "only allowed on halve" );
233 _parm_regs[i].set_bad();
234 continue;
235 }
236 VMReg parm_reg = vm_parm_regs[i].first();
237 assert(parm_reg->is_valid(), "invalid arg?");
238 if (parm_reg->is_reg()) {
239 OptoReg::Name opto_parm_reg = OptoReg::as_OptoReg(parm_reg);
240 assert(can_be_java_arg(opto_parm_reg) ||
241 C->stub_function() == CAST_FROM_FN_PTR(address, OptoRuntime::rethrow_C) ||
242 opto_parm_reg == inline_cache_reg(),
243 "parameters in register must be preserved by runtime stubs");
244 }
245 for (uint j = 0; j < i; j++) {
246 assert(parm_reg != vm_parm_regs[j].first(),
247 "calling conv. must produce distinct regs");
248 }
249 }
250 }
251 #endif
252
253 // Do some initial frame layout.
254
255 // Compute the old incoming SP (may be called FP) as
256 // OptoReg::stack0() + locks + in_preserve_stack_slots + pad2.
257 _old_SP = C->compute_old_SP();
258 assert( is_even(_old_SP), "must be even" );
259
260 // Compute highest incoming stack argument as
261 // _old_SP + out_preserve_stack_slots + incoming argument size.
262 _in_arg_limit = OptoReg::add(_old_SP, C->out_preserve_stack_slots());
263 assert( is_even(_in_arg_limit), "out_preserve must be even" );
264 for( i = 0; i < argcnt; i++ ) {
265 // Permit args to have no register
266 _calling_convention_mask[i].Clear();
267 if( !vm_parm_regs[i].first()->is_valid() && !vm_parm_regs[i].second()->is_valid() ) {
268 continue;
269 }
270 // calling_convention returns stack arguments as a count of
271 // slots beyond OptoReg::stack0()/VMRegImpl::stack0. We need to convert this to
272 // the allocators point of view, taking into account all the
273 // preserve area, locks & pad2.
274
275 OptoReg::Name reg1 = warp_incoming_stk_arg(vm_parm_regs[i].first());
276 if( OptoReg::is_valid(reg1))
277 _calling_convention_mask[i].Insert(reg1);
278
279 OptoReg::Name reg2 = warp_incoming_stk_arg(vm_parm_regs[i].second());
280 if( OptoReg::is_valid(reg2))
281 _calling_convention_mask[i].Insert(reg2);
282
283 // Saved biased stack-slot register number
284 _parm_regs[i].set_pair(reg2, reg1);
285 }
286
287 // Finally, make sure the incoming arguments take up an even number of
288 // words, in case the arguments or locals need to contain doubleword stack
289 // slots. The rest of the system assumes that stack slot pairs (in
290 // particular, in the spill area) which look aligned will in fact be
291 // aligned relative to the stack pointer in the target machine. Double
292 // stack slots will always be allocated aligned.
293 _new_SP = OptoReg::Name(align_up(_in_arg_limit, (int)RegMask::SlotsPerLong));
294
295 // Compute highest outgoing stack argument as
296 // _new_SP + out_preserve_stack_slots + max(outgoing argument size).
297 _out_arg_limit = OptoReg::add(_new_SP, C->out_preserve_stack_slots());
298 assert( is_even(_out_arg_limit), "out_preserve must be even" );
299
300 if (!RegMask::can_represent_arg(OptoReg::add(_out_arg_limit,-1))) {
301 // the compiler cannot represent this method's calling sequence
302 C->record_method_not_compilable("must be able to represent all call arguments in reg mask");
303 }
304
305 if (C->failing()) return; // bailed out on incoming arg failure
306
307 // ---------------
308 // Collect roots of matcher trees. Every node for which
309 // _shared[_idx] is cleared is guaranteed to not be shared, and thus
310 // can be a valid interior of some tree.
311 find_shared( C->root() );
312 find_shared( C->top() );
313
314 C->print_method(PHASE_BEFORE_MATCHING);
315
316 // Create new ideal node ConP #NULL even if it does exist in old space
317 // to avoid false sharing if the corresponding mach node is not used.
318 // The corresponding mach node is only used in rare cases for derived
319 // pointers.
320 Node* new_ideal_null = ConNode::make(TypePtr::NULL_PTR);
321
322 // Swap out to old-space; emptying new-space
323 Arena *old = C->node_arena()->move_contents(C->old_arena());
324
325 // Save debug and profile information for nodes in old space:
326 _old_node_note_array = C->node_note_array();
327 if (_old_node_note_array != NULL) {
328 C->set_node_note_array(new(C->comp_arena()) GrowableArray<Node_Notes*>
329 (C->comp_arena(), _old_node_note_array->length(),
330 0, NULL));
331 }
332
333 // Pre-size the new_node table to avoid the need for range checks.
334 grow_new_node_array(C->unique());
335
336 // Reset node counter so MachNodes start with _idx at 0
337 int live_nodes = C->live_nodes();
338 C->set_unique(0);
339 C->reset_dead_node_list();
340
341 // Recursively match trees from old space into new space.
342 // Correct leaves of new-space Nodes; they point to old-space.
343 _visited.Clear(); // Clear visit bits for xform call
344 C->set_cached_top_node(xform( C->top(), live_nodes ));
345 if (!C->failing()) {
346 Node* xroot = xform( C->root(), 1 );
347 if (xroot == NULL) {
348 Matcher::soft_match_failure(); // recursive matching process failed
349 C->record_method_not_compilable("instruction match failed");
350 } else {
351 // During matching shared constants were attached to C->root()
352 // because xroot wasn't available yet, so transfer the uses to
353 // the xroot.
354 for( DUIterator_Fast jmax, j = C->root()->fast_outs(jmax); j < jmax; j++ ) {
355 Node* n = C->root()->fast_out(j);
356 if (C->node_arena()->contains(n)) {
357 assert(n->in(0) == C->root(), "should be control user");
358 n->set_req(0, xroot);
359 --j;
360 --jmax;
361 }
362 }
363
364 // Generate new mach node for ConP #NULL
365 assert(new_ideal_null != NULL, "sanity");
366 _mach_null = match_tree(new_ideal_null);
367 // Don't set control, it will confuse GCM since there are no uses.
368 // The control will be set when this node is used first time
369 // in find_base_for_derived().
370 assert(_mach_null != NULL, "");
371
372 C->set_root(xroot->is_Root() ? xroot->as_Root() : NULL);
373
374 #ifdef ASSERT
375 verify_new_nodes_only(xroot);
376 #endif
377 }
378 }
379 if (C->top() == NULL || C->root() == NULL) {
380 C->record_method_not_compilable("graph lost"); // %%% cannot happen?
381 }
382 if (C->failing()) {
383 // delete old;
384 old->destruct_contents();
385 return;
386 }
387 assert( C->top(), "" );
388 assert( C->root(), "" );
389 validate_null_checks();
390
391 // Now smoke old-space
392 NOT_DEBUG( old->destruct_contents() );
393
394 // ------------------------
395 // Set up save-on-entry registers
396 Fixup_Save_On_Entry( );
397 }
398
399
400 //------------------------------Fixup_Save_On_Entry----------------------------
401 // The stated purpose of this routine is to take care of save-on-entry
402 // registers. However, the overall goal of the Match phase is to convert into
403 // machine-specific instructions which have RegMasks to guide allocation.
404 // So what this procedure really does is put a valid RegMask on each input
405 // to the machine-specific variations of all Return, TailCall and Halt
406 // instructions. It also adds edgs to define the save-on-entry values (and of
407 // course gives them a mask).
408
409 static RegMask *init_input_masks( uint size, RegMask &ret_adr, RegMask &fp ) {
410 RegMask *rms = NEW_RESOURCE_ARRAY( RegMask, size );
411 // Do all the pre-defined register masks
412 rms[TypeFunc::Control ] = RegMask::Empty;
413 rms[TypeFunc::I_O ] = RegMask::Empty;
414 rms[TypeFunc::Memory ] = RegMask::Empty;
415 rms[TypeFunc::ReturnAdr] = ret_adr;
416 rms[TypeFunc::FramePtr ] = fp;
417 return rms;
418 }
419
420 #define NOF_STACK_MASKS (3*6+5)
421
422 // Create the initial stack mask used by values spilling to the stack.
423 // Disallow any debug info in outgoing argument areas by setting the
424 // initial mask accordingly.
425 void Matcher::init_first_stack_mask() {
426
427 // Allocate storage for spill masks as masks for the appropriate load type.
428 RegMask *rms = (RegMask*)C->comp_arena()->Amalloc_D(sizeof(RegMask) * NOF_STACK_MASKS);
429
430 // Initialize empty placeholder masks into the newly allocated arena
431 for (int i = 0; i < NOF_STACK_MASKS; i++) {
432 new (rms + i) RegMask();
433 }
434
435 idealreg2spillmask [Op_RegN] = &rms[0];
436 idealreg2spillmask [Op_RegI] = &rms[1];
437 idealreg2spillmask [Op_RegL] = &rms[2];
438 idealreg2spillmask [Op_RegF] = &rms[3];
439 idealreg2spillmask [Op_RegD] = &rms[4];
440 idealreg2spillmask [Op_RegP] = &rms[5];
441
442 idealreg2debugmask [Op_RegN] = &rms[6];
443 idealreg2debugmask [Op_RegI] = &rms[7];
444 idealreg2debugmask [Op_RegL] = &rms[8];
445 idealreg2debugmask [Op_RegF] = &rms[9];
446 idealreg2debugmask [Op_RegD] = &rms[10];
447 idealreg2debugmask [Op_RegP] = &rms[11];
448
449 idealreg2mhdebugmask[Op_RegN] = &rms[12];
450 idealreg2mhdebugmask[Op_RegI] = &rms[13];
451 idealreg2mhdebugmask[Op_RegL] = &rms[14];
452 idealreg2mhdebugmask[Op_RegF] = &rms[15];
453 idealreg2mhdebugmask[Op_RegD] = &rms[16];
454 idealreg2mhdebugmask[Op_RegP] = &rms[17];
455
456 idealreg2spillmask [Op_VecS] = &rms[18];
457 idealreg2spillmask [Op_VecD] = &rms[19];
458 idealreg2spillmask [Op_VecX] = &rms[20];
459 idealreg2spillmask [Op_VecY] = &rms[21];
460 idealreg2spillmask [Op_VecZ] = &rms[22];
461
462 OptoReg::Name i;
463
464 // At first, start with the empty mask
465 C->FIRST_STACK_mask().Clear();
466
467 // Add in the incoming argument area
468 OptoReg::Name init_in = OptoReg::add(_old_SP, C->out_preserve_stack_slots());
469 for (i = init_in; i < _in_arg_limit; i = OptoReg::add(i,1)) {
470 C->FIRST_STACK_mask().Insert(i);
471 }
472 // Add in all bits past the outgoing argument area
473 guarantee(RegMask::can_represent_arg(OptoReg::add(_out_arg_limit,-1)),
474 "must be able to represent all call arguments in reg mask");
475 OptoReg::Name init = _out_arg_limit;
476 for (i = init; RegMask::can_represent(i); i = OptoReg::add(i,1)) {
477 C->FIRST_STACK_mask().Insert(i);
478 }
479 // Finally, set the "infinite stack" bit.
480 C->FIRST_STACK_mask().set_AllStack();
481
482 // Make spill masks. Registers for their class, plus FIRST_STACK_mask.
483 RegMask aligned_stack_mask = C->FIRST_STACK_mask();
484 // Keep spill masks aligned.
485 aligned_stack_mask.clear_to_pairs();
486 assert(aligned_stack_mask.is_AllStack(), "should be infinite stack");
487
488 *idealreg2spillmask[Op_RegP] = *idealreg2regmask[Op_RegP];
489 #ifdef _LP64
490 *idealreg2spillmask[Op_RegN] = *idealreg2regmask[Op_RegN];
491 idealreg2spillmask[Op_RegN]->OR(C->FIRST_STACK_mask());
492 idealreg2spillmask[Op_RegP]->OR(aligned_stack_mask);
493 #else
494 idealreg2spillmask[Op_RegP]->OR(C->FIRST_STACK_mask());
495 #endif
496 *idealreg2spillmask[Op_RegI] = *idealreg2regmask[Op_RegI];
497 idealreg2spillmask[Op_RegI]->OR(C->FIRST_STACK_mask());
498 *idealreg2spillmask[Op_RegL] = *idealreg2regmask[Op_RegL];
499 idealreg2spillmask[Op_RegL]->OR(aligned_stack_mask);
500 *idealreg2spillmask[Op_RegF] = *idealreg2regmask[Op_RegF];
501 idealreg2spillmask[Op_RegF]->OR(C->FIRST_STACK_mask());
502 *idealreg2spillmask[Op_RegD] = *idealreg2regmask[Op_RegD];
503 idealreg2spillmask[Op_RegD]->OR(aligned_stack_mask);
504
505 if (Matcher::vector_size_supported(T_BYTE,4)) {
506 *idealreg2spillmask[Op_VecS] = *idealreg2regmask[Op_VecS];
507 idealreg2spillmask[Op_VecS]->OR(C->FIRST_STACK_mask());
508 }
509 if (Matcher::vector_size_supported(T_FLOAT,2)) {
510 // For VecD we need dual alignment and 8 bytes (2 slots) for spills.
511 // RA guarantees such alignment since it is needed for Double and Long values.
512 *idealreg2spillmask[Op_VecD] = *idealreg2regmask[Op_VecD];
513 idealreg2spillmask[Op_VecD]->OR(aligned_stack_mask);
514 }
515 if (Matcher::vector_size_supported(T_FLOAT,4)) {
516 // For VecX we need quadro alignment and 16 bytes (4 slots) for spills.
517 //
518 // RA can use input arguments stack slots for spills but until RA
519 // we don't know frame size and offset of input arg stack slots.
520 //
521 // Exclude last input arg stack slots to avoid spilling vectors there
522 // otherwise vector spills could stomp over stack slots in caller frame.
523 OptoReg::Name in = OptoReg::add(_in_arg_limit, -1);
524 for (int k = 1; (in >= init_in) && (k < RegMask::SlotsPerVecX); k++) {
525 aligned_stack_mask.Remove(in);
526 in = OptoReg::add(in, -1);
527 }
528 aligned_stack_mask.clear_to_sets(RegMask::SlotsPerVecX);
529 assert(aligned_stack_mask.is_AllStack(), "should be infinite stack");
530 *idealreg2spillmask[Op_VecX] = *idealreg2regmask[Op_VecX];
531 idealreg2spillmask[Op_VecX]->OR(aligned_stack_mask);
532 }
533 if (Matcher::vector_size_supported(T_FLOAT,8)) {
534 // For VecY we need octo alignment and 32 bytes (8 slots) for spills.
535 OptoReg::Name in = OptoReg::add(_in_arg_limit, -1);
536 for (int k = 1; (in >= init_in) && (k < RegMask::SlotsPerVecY); k++) {
537 aligned_stack_mask.Remove(in);
538 in = OptoReg::add(in, -1);
539 }
540 aligned_stack_mask.clear_to_sets(RegMask::SlotsPerVecY);
541 assert(aligned_stack_mask.is_AllStack(), "should be infinite stack");
542 *idealreg2spillmask[Op_VecY] = *idealreg2regmask[Op_VecY];
543 idealreg2spillmask[Op_VecY]->OR(aligned_stack_mask);
544 }
545 if (Matcher::vector_size_supported(T_FLOAT,16)) {
546 // For VecZ we need enough alignment and 64 bytes (16 slots) for spills.
547 OptoReg::Name in = OptoReg::add(_in_arg_limit, -1);
548 for (int k = 1; (in >= init_in) && (k < RegMask::SlotsPerVecZ); k++) {
549 aligned_stack_mask.Remove(in);
550 in = OptoReg::add(in, -1);
551 }
552 aligned_stack_mask.clear_to_sets(RegMask::SlotsPerVecZ);
553 assert(aligned_stack_mask.is_AllStack(), "should be infinite stack");
554 *idealreg2spillmask[Op_VecZ] = *idealreg2regmask[Op_VecZ];
555 idealreg2spillmask[Op_VecZ]->OR(aligned_stack_mask);
556 }
557 if (UseFPUForSpilling) {
558 // This mask logic assumes that the spill operations are
559 // symmetric and that the registers involved are the same size.
560 // On sparc for instance we may have to use 64 bit moves will
561 // kill 2 registers when used with F0-F31.
562 idealreg2spillmask[Op_RegI]->OR(*idealreg2regmask[Op_RegF]);
563 idealreg2spillmask[Op_RegF]->OR(*idealreg2regmask[Op_RegI]);
564 #ifdef _LP64
565 idealreg2spillmask[Op_RegN]->OR(*idealreg2regmask[Op_RegF]);
566 idealreg2spillmask[Op_RegL]->OR(*idealreg2regmask[Op_RegD]);
567 idealreg2spillmask[Op_RegD]->OR(*idealreg2regmask[Op_RegL]);
568 idealreg2spillmask[Op_RegP]->OR(*idealreg2regmask[Op_RegD]);
569 #else
570 idealreg2spillmask[Op_RegP]->OR(*idealreg2regmask[Op_RegF]);
571 #ifdef ARM
572 // ARM has support for moving 64bit values between a pair of
573 // integer registers and a double register
574 idealreg2spillmask[Op_RegL]->OR(*idealreg2regmask[Op_RegD]);
575 idealreg2spillmask[Op_RegD]->OR(*idealreg2regmask[Op_RegL]);
576 #endif
577 #endif
578 }
579
580 // Make up debug masks. Any spill slot plus callee-save registers.
581 // Caller-save registers are assumed to be trashable by the various
582 // inline-cache fixup routines.
583 *idealreg2debugmask [Op_RegN]= *idealreg2spillmask[Op_RegN];
584 *idealreg2debugmask [Op_RegI]= *idealreg2spillmask[Op_RegI];
585 *idealreg2debugmask [Op_RegL]= *idealreg2spillmask[Op_RegL];
586 *idealreg2debugmask [Op_RegF]= *idealreg2spillmask[Op_RegF];
587 *idealreg2debugmask [Op_RegD]= *idealreg2spillmask[Op_RegD];
588 *idealreg2debugmask [Op_RegP]= *idealreg2spillmask[Op_RegP];
589
590 *idealreg2mhdebugmask[Op_RegN]= *idealreg2spillmask[Op_RegN];
591 *idealreg2mhdebugmask[Op_RegI]= *idealreg2spillmask[Op_RegI];
592 *idealreg2mhdebugmask[Op_RegL]= *idealreg2spillmask[Op_RegL];
593 *idealreg2mhdebugmask[Op_RegF]= *idealreg2spillmask[Op_RegF];
594 *idealreg2mhdebugmask[Op_RegD]= *idealreg2spillmask[Op_RegD];
595 *idealreg2mhdebugmask[Op_RegP]= *idealreg2spillmask[Op_RegP];
596
597 // Prevent stub compilations from attempting to reference
598 // callee-saved registers from debug info
599 bool exclude_soe = !Compile::current()->is_method_compilation();
600
601 for( i=OptoReg::Name(0); i<OptoReg::Name(_last_Mach_Reg); i = OptoReg::add(i,1) ) {
602 // registers the caller has to save do not work
603 if( _register_save_policy[i] == 'C' ||
604 _register_save_policy[i] == 'A' ||
605 (_register_save_policy[i] == 'E' && exclude_soe) ) {
606 idealreg2debugmask [Op_RegN]->Remove(i);
607 idealreg2debugmask [Op_RegI]->Remove(i); // Exclude save-on-call
608 idealreg2debugmask [Op_RegL]->Remove(i); // registers from debug
609 idealreg2debugmask [Op_RegF]->Remove(i); // masks
610 idealreg2debugmask [Op_RegD]->Remove(i);
611 idealreg2debugmask [Op_RegP]->Remove(i);
612
613 idealreg2mhdebugmask[Op_RegN]->Remove(i);
614 idealreg2mhdebugmask[Op_RegI]->Remove(i);
615 idealreg2mhdebugmask[Op_RegL]->Remove(i);
616 idealreg2mhdebugmask[Op_RegF]->Remove(i);
617 idealreg2mhdebugmask[Op_RegD]->Remove(i);
618 idealreg2mhdebugmask[Op_RegP]->Remove(i);
619 }
620 }
621
622 // Subtract the register we use to save the SP for MethodHandle
623 // invokes to from the debug mask.
624 const RegMask save_mask = method_handle_invoke_SP_save_mask();
625 idealreg2mhdebugmask[Op_RegN]->SUBTRACT(save_mask);
626 idealreg2mhdebugmask[Op_RegI]->SUBTRACT(save_mask);
627 idealreg2mhdebugmask[Op_RegL]->SUBTRACT(save_mask);
628 idealreg2mhdebugmask[Op_RegF]->SUBTRACT(save_mask);
629 idealreg2mhdebugmask[Op_RegD]->SUBTRACT(save_mask);
630 idealreg2mhdebugmask[Op_RegP]->SUBTRACT(save_mask);
631 }
632
633 //---------------------------is_save_on_entry----------------------------------
634 bool Matcher::is_save_on_entry( int reg ) {
635 return
636 _register_save_policy[reg] == 'E' ||
637 _register_save_policy[reg] == 'A' || // Save-on-entry register?
638 // Also save argument registers in the trampolining stubs
639 (C->save_argument_registers() && is_spillable_arg(reg));
640 }
641
642 //---------------------------Fixup_Save_On_Entry-------------------------------
643 void Matcher::Fixup_Save_On_Entry( ) {
644 init_first_stack_mask();
645
646 Node *root = C->root(); // Short name for root
647 // Count number of save-on-entry registers.
648 uint soe_cnt = number_of_saved_registers();
649 uint i;
650
651 // Find the procedure Start Node
652 StartNode *start = C->start();
653 assert( start, "Expect a start node" );
654
655 // Save argument registers in the trampolining stubs
656 if( C->save_argument_registers() )
657 for( i = 0; i < _last_Mach_Reg; i++ )
658 if( is_spillable_arg(i) )
659 soe_cnt++;
660
661 // Input RegMask array shared by all Returns.
662 // The type for doubles and longs has a count of 2, but
663 // there is only 1 returned value
664 uint ret_edge_cnt = TypeFunc::Parms + ((C->tf()->range()->cnt() == TypeFunc::Parms) ? 0 : 1);
665 RegMask *ret_rms = init_input_masks( ret_edge_cnt + soe_cnt, _return_addr_mask, c_frame_ptr_mask );
666 // Returns have 0 or 1 returned values depending on call signature.
667 // Return register is specified by return_value in the AD file.
668 if (ret_edge_cnt > TypeFunc::Parms)
669 ret_rms[TypeFunc::Parms+0] = _return_value_mask;
670
671 // Input RegMask array shared by all Rethrows.
672 uint reth_edge_cnt = TypeFunc::Parms+1;
673 RegMask *reth_rms = init_input_masks( reth_edge_cnt + soe_cnt, _return_addr_mask, c_frame_ptr_mask );
674 // Rethrow takes exception oop only, but in the argument 0 slot.
675 OptoReg::Name reg = find_receiver(false);
676 if (reg >= 0) {
677 reth_rms[TypeFunc::Parms] = mreg2regmask[reg];
678 #ifdef _LP64
679 // Need two slots for ptrs in 64-bit land
680 reth_rms[TypeFunc::Parms].Insert(OptoReg::add(OptoReg::Name(reg), 1));
681 #endif
682 }
683
684 // Input RegMask array shared by all TailCalls
685 uint tail_call_edge_cnt = TypeFunc::Parms+2;
686 RegMask *tail_call_rms = init_input_masks( tail_call_edge_cnt + soe_cnt, _return_addr_mask, c_frame_ptr_mask );
687
688 // Input RegMask array shared by all TailJumps
689 uint tail_jump_edge_cnt = TypeFunc::Parms+2;
690 RegMask *tail_jump_rms = init_input_masks( tail_jump_edge_cnt + soe_cnt, _return_addr_mask, c_frame_ptr_mask );
691
692 // TailCalls have 2 returned values (target & moop), whose masks come
693 // from the usual MachNode/MachOper mechanism. Find a sample
694 // TailCall to extract these masks and put the correct masks into
695 // the tail_call_rms array.
696 for( i=1; i < root->req(); i++ ) {
697 MachReturnNode *m = root->in(i)->as_MachReturn();
698 if( m->ideal_Opcode() == Op_TailCall ) {
699 tail_call_rms[TypeFunc::Parms+0] = m->MachNode::in_RegMask(TypeFunc::Parms+0);
700 tail_call_rms[TypeFunc::Parms+1] = m->MachNode::in_RegMask(TypeFunc::Parms+1);
701 break;
702 }
703 }
704
705 // TailJumps have 2 returned values (target & ex_oop), whose masks come
706 // from the usual MachNode/MachOper mechanism. Find a sample
707 // TailJump to extract these masks and put the correct masks into
708 // the tail_jump_rms array.
709 for( i=1; i < root->req(); i++ ) {
710 MachReturnNode *m = root->in(i)->as_MachReturn();
711 if( m->ideal_Opcode() == Op_TailJump ) {
712 tail_jump_rms[TypeFunc::Parms+0] = m->MachNode::in_RegMask(TypeFunc::Parms+0);
713 tail_jump_rms[TypeFunc::Parms+1] = m->MachNode::in_RegMask(TypeFunc::Parms+1);
714 break;
715 }
716 }
717
718 // Input RegMask array shared by all Halts
719 uint halt_edge_cnt = TypeFunc::Parms;
720 RegMask *halt_rms = init_input_masks( halt_edge_cnt + soe_cnt, _return_addr_mask, c_frame_ptr_mask );
721
722 // Capture the return input masks into each exit flavor
723 for( i=1; i < root->req(); i++ ) {
724 MachReturnNode *exit = root->in(i)->as_MachReturn();
725 switch( exit->ideal_Opcode() ) {
726 case Op_Return : exit->_in_rms = ret_rms; break;
727 case Op_Rethrow : exit->_in_rms = reth_rms; break;
728 case Op_TailCall : exit->_in_rms = tail_call_rms; break;
729 case Op_TailJump : exit->_in_rms = tail_jump_rms; break;
730 case Op_Halt : exit->_in_rms = halt_rms; break;
731 default : ShouldNotReachHere();
732 }
733 }
734
735 // Next unused projection number from Start.
736 int proj_cnt = C->tf()->domain()->cnt();
737
738 // Do all the save-on-entry registers. Make projections from Start for
739 // them, and give them a use at the exit points. To the allocator, they
740 // look like incoming register arguments.
741 for( i = 0; i < _last_Mach_Reg; i++ ) {
742 if( is_save_on_entry(i) ) {
743
744 // Add the save-on-entry to the mask array
745 ret_rms [ ret_edge_cnt] = mreg2regmask[i];
746 reth_rms [ reth_edge_cnt] = mreg2regmask[i];
747 tail_call_rms[tail_call_edge_cnt] = mreg2regmask[i];
748 tail_jump_rms[tail_jump_edge_cnt] = mreg2regmask[i];
749 // Halts need the SOE registers, but only in the stack as debug info.
750 // A just-prior uncommon-trap or deoptimization will use the SOE regs.
751 halt_rms [ halt_edge_cnt] = *idealreg2spillmask[_register_save_type[i]];
752
753 Node *mproj;
754
755 // Is this a RegF low half of a RegD? Double up 2 adjacent RegF's
756 // into a single RegD.
757 if( (i&1) == 0 &&
758 _register_save_type[i ] == Op_RegF &&
759 _register_save_type[i+1] == Op_RegF &&
760 is_save_on_entry(i+1) ) {
761 // Add other bit for double
762 ret_rms [ ret_edge_cnt].Insert(OptoReg::Name(i+1));
763 reth_rms [ reth_edge_cnt].Insert(OptoReg::Name(i+1));
764 tail_call_rms[tail_call_edge_cnt].Insert(OptoReg::Name(i+1));
765 tail_jump_rms[tail_jump_edge_cnt].Insert(OptoReg::Name(i+1));
766 halt_rms [ halt_edge_cnt].Insert(OptoReg::Name(i+1));
767 mproj = new MachProjNode( start, proj_cnt, ret_rms[ret_edge_cnt], Op_RegD );
768 proj_cnt += 2; // Skip 2 for doubles
769 }
770 else if( (i&1) == 1 && // Else check for high half of double
771 _register_save_type[i-1] == Op_RegF &&
772 _register_save_type[i ] == Op_RegF &&
773 is_save_on_entry(i-1) ) {
774 ret_rms [ ret_edge_cnt] = RegMask::Empty;
775 reth_rms [ reth_edge_cnt] = RegMask::Empty;
776 tail_call_rms[tail_call_edge_cnt] = RegMask::Empty;
777 tail_jump_rms[tail_jump_edge_cnt] = RegMask::Empty;
778 halt_rms [ halt_edge_cnt] = RegMask::Empty;
779 mproj = C->top();
780 }
781 // Is this a RegI low half of a RegL? Double up 2 adjacent RegI's
782 // into a single RegL.
783 else if( (i&1) == 0 &&
784 _register_save_type[i ] == Op_RegI &&
785 _register_save_type[i+1] == Op_RegI &&
786 is_save_on_entry(i+1) ) {
787 // Add other bit for long
788 ret_rms [ ret_edge_cnt].Insert(OptoReg::Name(i+1));
789 reth_rms [ reth_edge_cnt].Insert(OptoReg::Name(i+1));
790 tail_call_rms[tail_call_edge_cnt].Insert(OptoReg::Name(i+1));
791 tail_jump_rms[tail_jump_edge_cnt].Insert(OptoReg::Name(i+1));
792 halt_rms [ halt_edge_cnt].Insert(OptoReg::Name(i+1));
793 mproj = new MachProjNode( start, proj_cnt, ret_rms[ret_edge_cnt], Op_RegL );
794 proj_cnt += 2; // Skip 2 for longs
795 }
796 else if( (i&1) == 1 && // Else check for high half of long
797 _register_save_type[i-1] == Op_RegI &&
798 _register_save_type[i ] == Op_RegI &&
799 is_save_on_entry(i-1) ) {
800 ret_rms [ ret_edge_cnt] = RegMask::Empty;
801 reth_rms [ reth_edge_cnt] = RegMask::Empty;
802 tail_call_rms[tail_call_edge_cnt] = RegMask::Empty;
803 tail_jump_rms[tail_jump_edge_cnt] = RegMask::Empty;
804 halt_rms [ halt_edge_cnt] = RegMask::Empty;
805 mproj = C->top();
806 } else {
807 // Make a projection for it off the Start
808 mproj = new MachProjNode( start, proj_cnt++, ret_rms[ret_edge_cnt], _register_save_type[i] );
809 }
810
811 ret_edge_cnt ++;
812 reth_edge_cnt ++;
813 tail_call_edge_cnt ++;
814 tail_jump_edge_cnt ++;
815 halt_edge_cnt ++;
816
817 // Add a use of the SOE register to all exit paths
818 for( uint j=1; j < root->req(); j++ )
819 root->in(j)->add_req(mproj);
820 } // End of if a save-on-entry register
821 } // End of for all machine registers
822 }
823
824 //------------------------------init_spill_mask--------------------------------
825 void Matcher::init_spill_mask( Node *ret ) {
826 if( idealreg2regmask[Op_RegI] ) return; // One time only init
827
828 OptoReg::c_frame_pointer = c_frame_pointer();
829 c_frame_ptr_mask = c_frame_pointer();
830 #ifdef _LP64
831 // pointers are twice as big
832 c_frame_ptr_mask.Insert(OptoReg::add(c_frame_pointer(),1));
833 #endif
834
835 // Start at OptoReg::stack0()
836 STACK_ONLY_mask.Clear();
837 OptoReg::Name init = OptoReg::stack2reg(0);
838 // STACK_ONLY_mask is all stack bits
839 OptoReg::Name i;
840 for (i = init; RegMask::can_represent(i); i = OptoReg::add(i,1))
841 STACK_ONLY_mask.Insert(i);
842 // Also set the "infinite stack" bit.
843 STACK_ONLY_mask.set_AllStack();
844
845 // Copy the register names over into the shared world
846 for( i=OptoReg::Name(0); i<OptoReg::Name(_last_Mach_Reg); i = OptoReg::add(i,1) ) {
847 // SharedInfo::regName[i] = regName[i];
848 // Handy RegMasks per machine register
849 mreg2regmask[i].Insert(i);
850 }
851
852 // Grab the Frame Pointer
853 Node *fp = ret->in(TypeFunc::FramePtr);
854 Node *mem = ret->in(TypeFunc::Memory);
855 const TypePtr* atp = TypePtr::BOTTOM;
856 // Share frame pointer while making spill ops
857 set_shared(fp);
858
859 // Compute generic short-offset Loads
860 #ifdef _LP64
861 MachNode *spillCP = match_tree(new LoadNNode(NULL,mem,fp,atp,TypeInstPtr::BOTTOM,MemNode::unordered));
862 #endif
863 MachNode *spillI = match_tree(new LoadINode(NULL,mem,fp,atp,TypeInt::INT,MemNode::unordered));
864 MachNode *spillL = match_tree(new LoadLNode(NULL,mem,fp,atp,TypeLong::LONG,MemNode::unordered, LoadNode::DependsOnlyOnTest, false));
865 MachNode *spillF = match_tree(new LoadFNode(NULL,mem,fp,atp,Type::FLOAT,MemNode::unordered));
866 MachNode *spillD = match_tree(new LoadDNode(NULL,mem,fp,atp,Type::DOUBLE,MemNode::unordered));
867 MachNode *spillP = match_tree(new LoadPNode(NULL,mem,fp,atp,TypeInstPtr::BOTTOM,MemNode::unordered));
868 assert(spillI != NULL && spillL != NULL && spillF != NULL &&
869 spillD != NULL && spillP != NULL, "");
870 // Get the ADLC notion of the right regmask, for each basic type.
871 #ifdef _LP64
872 idealreg2regmask[Op_RegN] = &spillCP->out_RegMask();
873 #endif
874 idealreg2regmask[Op_RegI] = &spillI->out_RegMask();
875 idealreg2regmask[Op_RegL] = &spillL->out_RegMask();
876 idealreg2regmask[Op_RegF] = &spillF->out_RegMask();
877 idealreg2regmask[Op_RegD] = &spillD->out_RegMask();
878 idealreg2regmask[Op_RegP] = &spillP->out_RegMask();
879
880 // Vector regmasks.
881 if (Matcher::vector_size_supported(T_BYTE,4)) {
882 TypeVect::VECTS = TypeVect::make(T_BYTE, 4);
883 MachNode *spillVectS = match_tree(new LoadVectorNode(NULL,mem,fp,atp,TypeVect::VECTS));
884 idealreg2regmask[Op_VecS] = &spillVectS->out_RegMask();
885 }
886 if (Matcher::vector_size_supported(T_FLOAT,2)) {
887 MachNode *spillVectD = match_tree(new LoadVectorNode(NULL,mem,fp,atp,TypeVect::VECTD));
888 idealreg2regmask[Op_VecD] = &spillVectD->out_RegMask();
889 }
890 if (Matcher::vector_size_supported(T_FLOAT,4)) {
891 MachNode *spillVectX = match_tree(new LoadVectorNode(NULL,mem,fp,atp,TypeVect::VECTX));
892 idealreg2regmask[Op_VecX] = &spillVectX->out_RegMask();
893 }
894 if (Matcher::vector_size_supported(T_FLOAT,8)) {
895 MachNode *spillVectY = match_tree(new LoadVectorNode(NULL,mem,fp,atp,TypeVect::VECTY));
896 idealreg2regmask[Op_VecY] = &spillVectY->out_RegMask();
897 }
898 if (Matcher::vector_size_supported(T_FLOAT,16)) {
899 MachNode *spillVectZ = match_tree(new LoadVectorNode(NULL,mem,fp,atp,TypeVect::VECTZ));
900 idealreg2regmask[Op_VecZ] = &spillVectZ->out_RegMask();
901 }
902 }
903
904 #ifdef ASSERT
905 static void match_alias_type(Compile* C, Node* n, Node* m) {
906 if (!VerifyAliases) return; // do not go looking for trouble by default
907 const TypePtr* nat = n->adr_type();
908 const TypePtr* mat = m->adr_type();
909 int nidx = C->get_alias_index(nat);
910 int midx = C->get_alias_index(mat);
911 // Detune the assert for cases like (AndI 0xFF (LoadB p)).
912 if (nidx == Compile::AliasIdxTop && midx >= Compile::AliasIdxRaw) {
913 for (uint i = 1; i < n->req(); i++) {
914 Node* n1 = n->in(i);
915 const TypePtr* n1at = n1->adr_type();
916 if (n1at != NULL) {
917 nat = n1at;
918 nidx = C->get_alias_index(n1at);
919 }
920 }
921 }
922 // %%% Kludgery. Instead, fix ideal adr_type methods for all these cases:
923 if (nidx == Compile::AliasIdxTop && midx == Compile::AliasIdxRaw) {
924 switch (n->Opcode()) {
925 case Op_PrefetchAllocation:
926 nidx = Compile::AliasIdxRaw;
927 nat = TypeRawPtr::BOTTOM;
928 break;
929 }
930 }
931 if (nidx == Compile::AliasIdxRaw && midx == Compile::AliasIdxTop) {
932 switch (n->Opcode()) {
933 case Op_ClearArray:
934 midx = Compile::AliasIdxRaw;
935 mat = TypeRawPtr::BOTTOM;
936 break;
937 }
938 }
939 if (nidx == Compile::AliasIdxTop && midx == Compile::AliasIdxBot) {
940 switch (n->Opcode()) {
941 case Op_Return:
942 case Op_Rethrow:
943 case Op_Halt:
944 case Op_TailCall:
945 case Op_TailJump:
946 nidx = Compile::AliasIdxBot;
947 nat = TypePtr::BOTTOM;
948 break;
949 }
950 }
951 if (nidx == Compile::AliasIdxBot && midx == Compile::AliasIdxTop) {
952 switch (n->Opcode()) {
953 case Op_StrComp:
954 case Op_StrEquals:
955 case Op_StrIndexOf:
956 case Op_StrIndexOfChar:
957 case Op_AryEq:
958 case Op_HasNegatives:
959 case Op_MemBarVolatile:
960 case Op_MemBarCPUOrder: // %%% these ideals should have narrower adr_type?
961 case Op_StrInflatedCopy:
962 case Op_StrCompressedCopy:
963 case Op_OnSpinWait:
964 case Op_EncodeISOArray:
965 nidx = Compile::AliasIdxTop;
966 nat = NULL;
967 break;
968 }
969 }
970 if (nidx != midx) {
971 if (PrintOpto || (PrintMiscellaneous && (WizardMode || Verbose))) {
972 tty->print_cr("==== Matcher alias shift %d => %d", nidx, midx);
973 n->dump();
974 m->dump();
975 }
976 assert(C->subsume_loads() && C->must_alias(nat, midx),
977 "must not lose alias info when matching");
978 }
979 }
980 #endif
981
982 //------------------------------xform------------------------------------------
983 // Given a Node in old-space, Match him (Label/Reduce) to produce a machine
984 // Node in new-space. Given a new-space Node, recursively walk his children.
985 Node *Matcher::transform( Node *n ) { ShouldNotCallThis(); return n; }
986 Node *Matcher::xform( Node *n, int max_stack ) {
987 // Use one stack to keep both: child's node/state and parent's node/index
988 MStack mstack(max_stack * 2 * 2); // usually: C->live_nodes() * 2 * 2
989 mstack.push(n, Visit, NULL, -1); // set NULL as parent to indicate root
990 while (mstack.is_nonempty()) {
991 C->check_node_count(NodeLimitFudgeFactor, "too many nodes matching instructions");
992 if (C->failing()) return NULL;
993 n = mstack.node(); // Leave node on stack
994 Node_State nstate = mstack.state();
995 if (nstate == Visit) {
996 mstack.set_state(Post_Visit);
997 Node *oldn = n;
998 // Old-space or new-space check
999 if (!C->node_arena()->contains(n)) {
1000 // Old space!
1001 Node* m;
1002 if (has_new_node(n)) { // Not yet Label/Reduced
1003 m = new_node(n);
1004 } else {
1005 if (!is_dontcare(n)) { // Matcher can match this guy
1006 // Calls match special. They match alone with no children.
1007 // Their children, the incoming arguments, match normally.
1008 m = n->is_SafePoint() ? match_sfpt(n->as_SafePoint()):match_tree(n);
1009 if (C->failing()) return NULL;
1010 if (m == NULL) { Matcher::soft_match_failure(); return NULL; }
1011 if (n->is_MemBar()) {
1012 m->as_MachMemBar()->set_adr_type(n->adr_type());
1013 }
1014 } else { // Nothing the matcher cares about
1015 if (n->is_Proj() && n->in(0) != NULL && n->in(0)->is_Multi()) { // Projections?
1016 // Convert to machine-dependent projection
1017 m = n->in(0)->as_Multi()->match( n->as_Proj(), this );
1018 #ifdef ASSERT
1019 _new2old_map.map(m->_idx, n);
1020 #endif
1021 if (m->in(0) != NULL) // m might be top
1022 collect_null_checks(m, n);
1023 } else { // Else just a regular 'ol guy
1024 m = n->clone(); // So just clone into new-space
1025 #ifdef ASSERT
1026 _new2old_map.map(m->_idx, n);
1027 #endif
1028 // Def-Use edges will be added incrementally as Uses
1029 // of this node are matched.
1030 assert(m->outcnt() == 0, "no Uses of this clone yet");
1031 }
1032 }
1033
1034 set_new_node(n, m); // Map old to new
1035 if (_old_node_note_array != NULL) {
1036 Node_Notes* nn = C->locate_node_notes(_old_node_note_array,
1037 n->_idx);
1038 C->set_node_notes_at(m->_idx, nn);
1039 }
1040 debug_only(match_alias_type(C, n, m));
1041 }
1042 n = m; // n is now a new-space node
1043 mstack.set_node(n);
1044 }
1045
1046 // New space!
1047 if (_visited.test_set(n->_idx)) continue; // while(mstack.is_nonempty())
1048
1049 int i;
1050 // Put precedence edges on stack first (match them last).
1051 for (i = oldn->req(); (uint)i < oldn->len(); i++) {
1052 Node *m = oldn->in(i);
1053 if (m == NULL) break;
1054 // set -1 to call add_prec() instead of set_req() during Step1
1055 mstack.push(m, Visit, n, -1);
1056 }
1057
1058 // Handle precedence edges for interior nodes
1059 for (i = n->len()-1; (uint)i >= n->req(); i--) {
1060 Node *m = n->in(i);
1061 if (m == NULL || C->node_arena()->contains(m)) continue;
1062 n->rm_prec(i);
1063 // set -1 to call add_prec() instead of set_req() during Step1
1064 mstack.push(m, Visit, n, -1);
1065 }
1066
1067 // For constant debug info, I'd rather have unmatched constants.
1068 int cnt = n->req();
1069 JVMState* jvms = n->jvms();
1070 int debug_cnt = jvms ? jvms->debug_start() : cnt;
1071
1072 // Now do only debug info. Clone constants rather than matching.
1073 // Constants are represented directly in the debug info without
1074 // the need for executable machine instructions.
1075 // Monitor boxes are also represented directly.
1076 for (i = cnt - 1; i >= debug_cnt; --i) { // For all debug inputs do
1077 Node *m = n->in(i); // Get input
1078 int op = m->Opcode();
1079 assert((op == Op_BoxLock) == jvms->is_monitor_use(i), "boxes only at monitor sites");
1080 if( op == Op_ConI || op == Op_ConP || op == Op_ConN || op == Op_ConNKlass ||
1081 op == Op_ConF || op == Op_ConD || op == Op_ConL
1082 // || op == Op_BoxLock // %%%% enable this and remove (+++) in chaitin.cpp
1083 ) {
1084 m = m->clone();
1085 #ifdef ASSERT
1086 _new2old_map.map(m->_idx, n);
1087 #endif
1088 mstack.push(m, Post_Visit, n, i); // Don't need to visit
1089 mstack.push(m->in(0), Visit, m, 0);
1090 } else {
1091 mstack.push(m, Visit, n, i);
1092 }
1093 }
1094
1095 // And now walk his children, and convert his inputs to new-space.
1096 for( ; i >= 0; --i ) { // For all normal inputs do
1097 Node *m = n->in(i); // Get input
1098 if(m != NULL)
1099 mstack.push(m, Visit, n, i);
1100 }
1101
1102 }
1103 else if (nstate == Post_Visit) {
1104 // Set xformed input
1105 Node *p = mstack.parent();
1106 if (p != NULL) { // root doesn't have parent
1107 int i = (int)mstack.index();
1108 if (i >= 0)
1109 p->set_req(i, n); // required input
1110 else if (i == -1)
1111 p->add_prec(n); // precedence input
1112 else
1113 ShouldNotReachHere();
1114 }
1115 mstack.pop(); // remove processed node from stack
1116 }
1117 else {
1118 ShouldNotReachHere();
1119 }
1120 } // while (mstack.is_nonempty())
1121 return n; // Return new-space Node
1122 }
1123
1124 //------------------------------warp_outgoing_stk_arg------------------------
1125 OptoReg::Name Matcher::warp_outgoing_stk_arg( VMReg reg, OptoReg::Name begin_out_arg_area, OptoReg::Name &out_arg_limit_per_call ) {
1126 // Convert outgoing argument location to a pre-biased stack offset
1127 if (reg->is_stack()) {
1128 OptoReg::Name warped = reg->reg2stack();
1129 // Adjust the stack slot offset to be the register number used
1130 // by the allocator.
1131 warped = OptoReg::add(begin_out_arg_area, warped);
1132 // Keep track of the largest numbered stack slot used for an arg.
1133 // Largest used slot per call-site indicates the amount of stack
1134 // that is killed by the call.
1135 if( warped >= out_arg_limit_per_call )
1136 out_arg_limit_per_call = OptoReg::add(warped,1);
1137 if (!RegMask::can_represent_arg(warped)) {
1138 C->record_method_not_compilable("unsupported calling sequence");
1139 return OptoReg::Bad;
1140 }
1141 return warped;
1142 }
1143 return OptoReg::as_OptoReg(reg);
1144 }
1145
1146
1147 //------------------------------match_sfpt-------------------------------------
1148 // Helper function to match call instructions. Calls match special.
1149 // They match alone with no children. Their children, the incoming
1150 // arguments, match normally.
1151 MachNode *Matcher::match_sfpt( SafePointNode *sfpt ) {
1152 MachSafePointNode *msfpt = NULL;
1153 MachCallNode *mcall = NULL;
1154 uint cnt;
1155 // Split out case for SafePoint vs Call
1156 CallNode *call;
1157 const TypeTuple *domain;
1158 ciMethod* method = NULL;
1159 bool is_method_handle_invoke = false; // for special kill effects
1160 if( sfpt->is_Call() ) {
1161 call = sfpt->as_Call();
1162 domain = call->tf()->domain();
1163 cnt = domain->cnt();
1164
1165 // Match just the call, nothing else
1166 MachNode *m = match_tree(call);
1167 if (C->failing()) return NULL;
1168 if( m == NULL ) { Matcher::soft_match_failure(); return NULL; }
1169
1170 // Copy data from the Ideal SafePoint to the machine version
1171 mcall = m->as_MachCall();
1172
1173 mcall->set_tf( call->tf());
1174 mcall->set_entry_point(call->entry_point());
1175 mcall->set_cnt( call->cnt());
1176
1177 if( mcall->is_MachCallJava() ) {
1178 MachCallJavaNode *mcall_java = mcall->as_MachCallJava();
1179 const CallJavaNode *call_java = call->as_CallJava();
1180 assert(call_java->validate_symbolic_info(), "inconsistent info");
1181 method = call_java->method();
1182 mcall_java->_method = method;
1183 mcall_java->_bci = call_java->_bci;
1184 mcall_java->_optimized_virtual = call_java->is_optimized_virtual();
1185 is_method_handle_invoke = call_java->is_method_handle_invoke();
1186 mcall_java->_method_handle_invoke = is_method_handle_invoke;
1187 mcall_java->_override_symbolic_info = call_java->override_symbolic_info();
1188 if (is_method_handle_invoke) {
1189 C->set_has_method_handle_invokes(true);
1190 }
1191 if( mcall_java->is_MachCallStaticJava() )
1192 mcall_java->as_MachCallStaticJava()->_name =
1193 call_java->as_CallStaticJava()->_name;
1194 if( mcall_java->is_MachCallDynamicJava() )
1195 mcall_java->as_MachCallDynamicJava()->_vtable_index =
1196 call_java->as_CallDynamicJava()->_vtable_index;
1197 }
1198 else if( mcall->is_MachCallRuntime() ) {
1199 mcall->as_MachCallRuntime()->_name = call->as_CallRuntime()->_name;
1200 }
1201 msfpt = mcall;
1202 }
1203 // This is a non-call safepoint
1204 else {
1205 call = NULL;
1206 domain = NULL;
1207 MachNode *mn = match_tree(sfpt);
1208 if (C->failing()) return NULL;
1209 msfpt = mn->as_MachSafePoint();
1210 cnt = TypeFunc::Parms;
1211 }
1212
1213 // Advertise the correct memory effects (for anti-dependence computation).
1214 msfpt->set_adr_type(sfpt->adr_type());
1215
1216 // Allocate a private array of RegMasks. These RegMasks are not shared.
1217 msfpt->_in_rms = NEW_RESOURCE_ARRAY( RegMask, cnt );
1218 // Empty them all.
1219 for (uint i = 0; i < cnt; i++) ::new (&(msfpt->_in_rms[i])) RegMask();
1220
1221 // Do all the pre-defined non-Empty register masks
1222 msfpt->_in_rms[TypeFunc::ReturnAdr] = _return_addr_mask;
1223 msfpt->_in_rms[TypeFunc::FramePtr ] = c_frame_ptr_mask;
1224
1225 // Place first outgoing argument can possibly be put.
1226 OptoReg::Name begin_out_arg_area = OptoReg::add(_new_SP, C->out_preserve_stack_slots());
1227 assert( is_even(begin_out_arg_area), "" );
1228 // Compute max outgoing register number per call site.
1229 OptoReg::Name out_arg_limit_per_call = begin_out_arg_area;
1230 // Calls to C may hammer extra stack slots above and beyond any arguments.
1231 // These are usually backing store for register arguments for varargs.
1232 if( call != NULL && call->is_CallRuntime() )
1233 out_arg_limit_per_call = OptoReg::add(out_arg_limit_per_call,C->varargs_C_out_slots_killed());
1234
1235
1236 // Do the normal argument list (parameters) register masks
1237 int argcnt = cnt - TypeFunc::Parms;
1238 if( argcnt > 0 ) { // Skip it all if we have no args
1239 BasicType *sig_bt = NEW_RESOURCE_ARRAY( BasicType, argcnt );
1240 VMRegPair *parm_regs = NEW_RESOURCE_ARRAY( VMRegPair, argcnt );
1241 int i;
1242 for( i = 0; i < argcnt; i++ ) {
1243 sig_bt[i] = domain->field_at(i+TypeFunc::Parms)->basic_type();
1244 }
1245 // V-call to pick proper calling convention
1246 call->calling_convention( sig_bt, parm_regs, argcnt );
1247
1248 #ifdef ASSERT
1249 // Sanity check users' calling convention. Really handy during
1250 // the initial porting effort. Fairly expensive otherwise.
1251 { for (int i = 0; i<argcnt; i++) {
1252 if( !parm_regs[i].first()->is_valid() &&
1253 !parm_regs[i].second()->is_valid() ) continue;
1254 VMReg reg1 = parm_regs[i].first();
1255 VMReg reg2 = parm_regs[i].second();
1256 for (int j = 0; j < i; j++) {
1257 if( !parm_regs[j].first()->is_valid() &&
1258 !parm_regs[j].second()->is_valid() ) continue;
1259 VMReg reg3 = parm_regs[j].first();
1260 VMReg reg4 = parm_regs[j].second();
1261 if( !reg1->is_valid() ) {
1262 assert( !reg2->is_valid(), "valid halvsies" );
1263 } else if( !reg3->is_valid() ) {
1264 assert( !reg4->is_valid(), "valid halvsies" );
1265 } else {
1266 assert( reg1 != reg2, "calling conv. must produce distinct regs");
1267 assert( reg1 != reg3, "calling conv. must produce distinct regs");
1268 assert( reg1 != reg4, "calling conv. must produce distinct regs");
1269 assert( reg2 != reg3, "calling conv. must produce distinct regs");
1270 assert( reg2 != reg4 || !reg2->is_valid(), "calling conv. must produce distinct regs");
1271 assert( reg3 != reg4, "calling conv. must produce distinct regs");
1272 }
1273 }
1274 }
1275 }
1276 #endif
1277
1278 // Visit each argument. Compute its outgoing register mask.
1279 // Return results now can have 2 bits returned.
1280 // Compute max over all outgoing arguments both per call-site
1281 // and over the entire method.
1282 for( i = 0; i < argcnt; i++ ) {
1283 // Address of incoming argument mask to fill in
1284 RegMask *rm = &mcall->_in_rms[i+TypeFunc::Parms];
1285 if( !parm_regs[i].first()->is_valid() &&
1286 !parm_regs[i].second()->is_valid() ) {
1287 continue; // Avoid Halves
1288 }
1289 // Grab first register, adjust stack slots and insert in mask.
1290 OptoReg::Name reg1 = warp_outgoing_stk_arg(parm_regs[i].first(), begin_out_arg_area, out_arg_limit_per_call );
1291 if (OptoReg::is_valid(reg1))
1292 rm->Insert( reg1 );
1293 // Grab second register (if any), adjust stack slots and insert in mask.
1294 OptoReg::Name reg2 = warp_outgoing_stk_arg(parm_regs[i].second(), begin_out_arg_area, out_arg_limit_per_call );
1295 if (OptoReg::is_valid(reg2))
1296 rm->Insert( reg2 );
1297 } // End of for all arguments
1298
1299 // Compute number of stack slots needed to restore stack in case of
1300 // Pascal-style argument popping.
1301 mcall->_argsize = out_arg_limit_per_call - begin_out_arg_area;
1302 }
1303
1304 // Compute the max stack slot killed by any call. These will not be
1305 // available for debug info, and will be used to adjust FIRST_STACK_mask
1306 // after all call sites have been visited.
1307 if( _out_arg_limit < out_arg_limit_per_call)
1308 _out_arg_limit = out_arg_limit_per_call;
1309
1310 if (mcall) {
1311 // Kill the outgoing argument area, including any non-argument holes and
1312 // any legacy C-killed slots. Use Fat-Projections to do the killing.
1313 // Since the max-per-method covers the max-per-call-site and debug info
1314 // is excluded on the max-per-method basis, debug info cannot land in
1315 // this killed area.
1316 uint r_cnt = mcall->tf()->range()->cnt();
1317 MachProjNode *proj = new MachProjNode( mcall, r_cnt+10000, RegMask::Empty, MachProjNode::fat_proj );
1318 if (!RegMask::can_represent_arg(OptoReg::Name(out_arg_limit_per_call-1))) {
1319 C->record_method_not_compilable("unsupported outgoing calling sequence");
1320 } else {
1321 for (int i = begin_out_arg_area; i < out_arg_limit_per_call; i++)
1322 proj->_rout.Insert(OptoReg::Name(i));
1323 }
1324 if (proj->_rout.is_NotEmpty()) {
1325 push_projection(proj);
1326 }
1327 }
1328 // Transfer the safepoint information from the call to the mcall
1329 // Move the JVMState list
1330 msfpt->set_jvms(sfpt->jvms());
1331 for (JVMState* jvms = msfpt->jvms(); jvms; jvms = jvms->caller()) {
1332 jvms->set_map(sfpt);
1333 }
1334
1335 // Debug inputs begin just after the last incoming parameter
1336 assert((mcall == NULL) || (mcall->jvms() == NULL) ||
1337 (mcall->jvms()->debug_start() + mcall->_jvmadj == mcall->tf()->domain()->cnt()), "");
1338
1339 // Move the OopMap
1340 msfpt->_oop_map = sfpt->_oop_map;
1341
1342 // Add additional edges.
1343 if (msfpt->mach_constant_base_node_input() != (uint)-1 && !msfpt->is_MachCallLeaf()) {
1344 // For these calls we can not add MachConstantBase in expand(), as the
1345 // ins are not complete then.
1346 msfpt->ins_req(msfpt->mach_constant_base_node_input(), C->mach_constant_base_node());
1347 if (msfpt->jvms() &&
1348 msfpt->mach_constant_base_node_input() <= msfpt->jvms()->debug_start() + msfpt->_jvmadj) {
1349 // We added an edge before jvms, so we must adapt the position of the ins.
1350 msfpt->jvms()->adapt_position(+1);
1351 }
1352 }
1353
1354 // Registers killed by the call are set in the local scheduling pass
1355 // of Global Code Motion.
1356 return msfpt;
1357 }
1358
1359 //---------------------------match_tree----------------------------------------
1360 // Match a Ideal Node DAG - turn it into a tree; Label & Reduce. Used as part
1361 // of the whole-sale conversion from Ideal to Mach Nodes. Also used for
1362 // making GotoNodes while building the CFG and in init_spill_mask() to identify
1363 // a Load's result RegMask for memoization in idealreg2regmask[]
1364 MachNode *Matcher::match_tree( const Node *n ) {
1365 assert( n->Opcode() != Op_Phi, "cannot match" );
1366 assert( !n->is_block_start(), "cannot match" );
1367 // Set the mark for all locally allocated State objects.
1368 // When this call returns, the _states_arena arena will be reset
1369 // freeing all State objects.
1370 ResourceMark rm( &_states_arena );
1371
1372 LabelRootDepth = 0;
1373
1374 // StoreNodes require their Memory input to match any LoadNodes
1375 Node *mem = n->is_Store() ? n->in(MemNode::Memory) : (Node*)1 ;
1376 #ifdef ASSERT
1377 Node* save_mem_node = _mem_node;
1378 _mem_node = n->is_Store() ? (Node*)n : NULL;
1379 #endif
1380 // State object for root node of match tree
1381 // Allocate it on _states_arena - stack allocation can cause stack overflow.
1382 State *s = new (&_states_arena) State;
1383 s->_kids[0] = NULL;
1384 s->_kids[1] = NULL;
1385 s->_leaf = (Node*)n;
1386 // Label the input tree, allocating labels from top-level arena
1387 Label_Root( n, s, n->in(0), mem );
1388 if (C->failing()) return NULL;
1389
1390 // The minimum cost match for the whole tree is found at the root State
1391 uint mincost = max_juint;
1392 uint cost = max_juint;
1393 uint i;
1394 for( i = 0; i < NUM_OPERANDS; i++ ) {
1395 if( s->valid(i) && // valid entry and
1396 s->_cost[i] < cost && // low cost and
1397 s->_rule[i] >= NUM_OPERANDS ) // not an operand
1398 cost = s->_cost[mincost=i];
1399 }
1400 if (mincost == max_juint) {
1401 #ifndef PRODUCT
1402 tty->print("No matching rule for:");
1403 s->dump();
1404 #endif
1405 Matcher::soft_match_failure();
1406 return NULL;
1407 }
1408 // Reduce input tree based upon the state labels to machine Nodes
1409 MachNode *m = ReduceInst( s, s->_rule[mincost], mem );
1410 #ifdef ASSERT
1411 _old2new_map.map(n->_idx, m);
1412 _new2old_map.map(m->_idx, (Node*)n);
1413 #endif
1414
1415 // Add any Matcher-ignored edges
1416 uint cnt = n->req();
1417 uint start = 1;
1418 if( mem != (Node*)1 ) start = MemNode::Memory+1;
1419 if( n->is_AddP() ) {
1420 assert( mem == (Node*)1, "" );
1421 start = AddPNode::Base+1;
1422 }
1423 for( i = start; i < cnt; i++ ) {
1424 if( !n->match_edge(i) ) {
1425 if( i < m->req() )
1426 m->ins_req( i, n->in(i) );
1427 else
1428 m->add_req( n->in(i) );
1429 }
1430 }
1431
1432 debug_only( _mem_node = save_mem_node; )
1433 return m;
1434 }
1435
1436
1437 //------------------------------match_into_reg---------------------------------
1438 // Choose to either match this Node in a register or part of the current
1439 // match tree. Return true for requiring a register and false for matching
1440 // as part of the current match tree.
1441 static bool match_into_reg( const Node *n, Node *m, Node *control, int i, bool shared ) {
1442
1443 const Type *t = m->bottom_type();
1444
1445 if (t->singleton()) {
1446 // Never force constants into registers. Allow them to match as
1447 // constants or registers. Copies of the same value will share
1448 // the same register. See find_shared_node.
1449 return false;
1450 } else { // Not a constant
1451 // Stop recursion if they have different Controls.
1452 Node* m_control = m->in(0);
1453 // Control of load's memory can post-dominates load's control.
1454 // So use it since load can't float above its memory.
1455 Node* mem_control = (m->is_Load()) ? m->in(MemNode::Memory)->in(0) : NULL;
1456 if (control && m_control && control != m_control && control != mem_control) {
1457
1458 // Actually, we can live with the most conservative control we
1459 // find, if it post-dominates the others. This allows us to
1460 // pick up load/op/store trees where the load can float a little
1461 // above the store.
1462 Node *x = control;
1463 const uint max_scan = 6; // Arbitrary scan cutoff
1464 uint j;
1465 for (j=0; j<max_scan; j++) {
1466 if (x->is_Region()) // Bail out at merge points
1467 return true;
1468 x = x->in(0);
1469 if (x == m_control) // Does 'control' post-dominate
1470 break; // m->in(0)? If so, we can use it
1471 if (x == mem_control) // Does 'control' post-dominate
1472 break; // mem_control? If so, we can use it
1473 }
1474 if (j == max_scan) // No post-domination before scan end?
1475 return true; // Then break the match tree up
1476 }
1477 if ((m->is_DecodeN() && Matcher::narrow_oop_use_complex_address()) ||
1478 (m->is_DecodeNKlass() && Matcher::narrow_klass_use_complex_address())) {
1479 // These are commonly used in address expressions and can
1480 // efficiently fold into them on X64 in some cases.
1481 return false;
1482 }
1483 }
1484
1485 // Not forceable cloning. If shared, put it into a register.
1486 return shared;
1487 }
1488
1489
1490 //------------------------------Instruction Selection--------------------------
1491 // Label method walks a "tree" of nodes, using the ADLC generated DFA to match
1492 // ideal nodes to machine instructions. Trees are delimited by shared Nodes,
1493 // things the Matcher does not match (e.g., Memory), and things with different
1494 // Controls (hence forced into different blocks). We pass in the Control
1495 // selected for this entire State tree.
1496
1497 // The Matcher works on Trees, but an Intel add-to-memory requires a DAG: the
1498 // Store and the Load must have identical Memories (as well as identical
1499 // pointers). Since the Matcher does not have anything for Memory (and
1500 // does not handle DAGs), I have to match the Memory input myself. If the
1501 // Tree root is a Store, I require all Loads to have the identical memory.
1502 Node *Matcher::Label_Root( const Node *n, State *svec, Node *control, const Node *mem){
1503 // Since Label_Root is a recursive function, its possible that we might run
1504 // out of stack space. See bugs 6272980 & 6227033 for more info.
1505 LabelRootDepth++;
1506 if (LabelRootDepth > MaxLabelRootDepth) {
1507 C->record_method_not_compilable("Out of stack space, increase MaxLabelRootDepth");
1508 return NULL;
1509 }
1510 uint care = 0; // Edges matcher cares about
1511 uint cnt = n->req();
1512 uint i = 0;
1513
1514 // Examine children for memory state
1515 // Can only subsume a child into your match-tree if that child's memory state
1516 // is not modified along the path to another input.
1517 // It is unsafe even if the other inputs are separate roots.
1518 Node *input_mem = NULL;
1519 for( i = 1; i < cnt; i++ ) {
1520 if( !n->match_edge(i) ) continue;
1521 Node *m = n->in(i); // Get ith input
1522 assert( m, "expect non-null children" );
1523 if( m->is_Load() ) {
1524 if( input_mem == NULL ) {
1525 input_mem = m->in(MemNode::Memory);
1526 } else if( input_mem != m->in(MemNode::Memory) ) {
1527 input_mem = NodeSentinel;
1528 }
1529 }
1530 }
1531
1532 for( i = 1; i < cnt; i++ ){// For my children
1533 if( !n->match_edge(i) ) continue;
1534 Node *m = n->in(i); // Get ith input
1535 // Allocate states out of a private arena
1536 State *s = new (&_states_arena) State;
1537 svec->_kids[care++] = s;
1538 assert( care <= 2, "binary only for now" );
1539
1540 // Recursively label the State tree.
1541 s->_kids[0] = NULL;
1542 s->_kids[1] = NULL;
1543 s->_leaf = m;
1544
1545 // Check for leaves of the State Tree; things that cannot be a part of
1546 // the current tree. If it finds any, that value is matched as a
1547 // register operand. If not, then the normal matching is used.
1548 if( match_into_reg(n, m, control, i, is_shared(m)) ||
1549 //
1550 // Stop recursion if this is LoadNode and the root of this tree is a
1551 // StoreNode and the load & store have different memories.
1552 ((mem!=(Node*)1) && m->is_Load() && m->in(MemNode::Memory) != mem) ||
1553 // Can NOT include the match of a subtree when its memory state
1554 // is used by any of the other subtrees
1555 (input_mem == NodeSentinel) ) {
1556 // Print when we exclude matching due to different memory states at input-loads
1557 if (PrintOpto && (Verbose && WizardMode) && (input_mem == NodeSentinel)
1558 && !((mem!=(Node*)1) && m->is_Load() && m->in(MemNode::Memory) != mem)) {
1559 tty->print_cr("invalid input_mem");
1560 }
1561 // Switch to a register-only opcode; this value must be in a register
1562 // and cannot be subsumed as part of a larger instruction.
1563 s->DFA( m->ideal_reg(), m );
1564
1565 } else {
1566 // If match tree has no control and we do, adopt it for entire tree
1567 if( control == NULL && m->in(0) != NULL && m->req() > 1 )
1568 control = m->in(0); // Pick up control
1569 // Else match as a normal part of the match tree.
1570 control = Label_Root(m,s,control,mem);
1571 if (C->failing()) return NULL;
1572 }
1573 }
1574
1575
1576 // Call DFA to match this node, and return
1577 svec->DFA( n->Opcode(), n );
1578
1579 #ifdef ASSERT
1580 uint x;
1581 for( x = 0; x < _LAST_MACH_OPER; x++ )
1582 if( svec->valid(x) )
1583 break;
1584
1585 if (x >= _LAST_MACH_OPER) {
1586 n->dump();
1587 svec->dump();
1588 assert( false, "bad AD file" );
1589 }
1590 #endif
1591 return control;
1592 }
1593
1594
1595 // Con nodes reduced using the same rule can share their MachNode
1596 // which reduces the number of copies of a constant in the final
1597 // program. The register allocator is free to split uses later to
1598 // split live ranges.
1599 MachNode* Matcher::find_shared_node(Node* leaf, uint rule) {
1600 if (!leaf->is_Con() && !leaf->is_DecodeNarrowPtr()) return NULL;
1601
1602 // See if this Con has already been reduced using this rule.
1603 if (_shared_nodes.Size() <= leaf->_idx) return NULL;
1604 MachNode* last = (MachNode*)_shared_nodes.at(leaf->_idx);
1605 if (last != NULL && rule == last->rule()) {
1606 // Don't expect control change for DecodeN
1607 if (leaf->is_DecodeNarrowPtr())
1608 return last;
1609 // Get the new space root.
1610 Node* xroot = new_node(C->root());
1611 if (xroot == NULL) {
1612 // This shouldn't happen give the order of matching.
1613 return NULL;
1614 }
1615
1616 // Shared constants need to have their control be root so they
1617 // can be scheduled properly.
1618 Node* control = last->in(0);
1619 if (control != xroot) {
1620 if (control == NULL || control == C->root()) {
1621 last->set_req(0, xroot);
1622 } else {
1623 assert(false, "unexpected control");
1624 return NULL;
1625 }
1626 }
1627 return last;
1628 }
1629 return NULL;
1630 }
1631
1632
1633 //------------------------------ReduceInst-------------------------------------
1634 // Reduce a State tree (with given Control) into a tree of MachNodes.
1635 // This routine (and it's cohort ReduceOper) convert Ideal Nodes into
1636 // complicated machine Nodes. Each MachNode covers some tree of Ideal Nodes.
1637 // Each MachNode has a number of complicated MachOper operands; each
1638 // MachOper also covers a further tree of Ideal Nodes.
1639
1640 // The root of the Ideal match tree is always an instruction, so we enter
1641 // the recursion here. After building the MachNode, we need to recurse
1642 // the tree checking for these cases:
1643 // (1) Child is an instruction -
1644 // Build the instruction (recursively), add it as an edge.
1645 // Build a simple operand (register) to hold the result of the instruction.
1646 // (2) Child is an interior part of an instruction -
1647 // Skip over it (do nothing)
1648 // (3) Child is the start of a operand -
1649 // Build the operand, place it inside the instruction
1650 // Call ReduceOper.
1651 MachNode *Matcher::ReduceInst( State *s, int rule, Node *&mem ) {
1652 assert( rule >= NUM_OPERANDS, "called with operand rule" );
1653
1654 MachNode* shared_node = find_shared_node(s->_leaf, rule);
1655 if (shared_node != NULL) {
1656 return shared_node;
1657 }
1658
1659 // Build the object to represent this state & prepare for recursive calls
1660 MachNode *mach = s->MachNodeGenerator(rule);
1661 guarantee(mach != NULL, "Missing MachNode");
1662 mach->_opnds[0] = s->MachOperGenerator(_reduceOp[rule]);
1663 assert( mach->_opnds[0] != NULL, "Missing result operand" );
1664 Node *leaf = s->_leaf;
1665 // Check for instruction or instruction chain rule
1666 if( rule >= _END_INST_CHAIN_RULE || rule < _BEGIN_INST_CHAIN_RULE ) {
1667 assert(C->node_arena()->contains(s->_leaf) || !has_new_node(s->_leaf),
1668 "duplicating node that's already been matched");
1669 // Instruction
1670 mach->add_req( leaf->in(0) ); // Set initial control
1671 // Reduce interior of complex instruction
1672 ReduceInst_Interior( s, rule, mem, mach, 1 );
1673 } else {
1674 // Instruction chain rules are data-dependent on their inputs
1675 mach->add_req(0); // Set initial control to none
1676 ReduceInst_Chain_Rule( s, rule, mem, mach );
1677 }
1678
1679 // If a Memory was used, insert a Memory edge
1680 if( mem != (Node*)1 ) {
1681 mach->ins_req(MemNode::Memory,mem);
1682 #ifdef ASSERT
1683 // Verify adr type after matching memory operation
1684 const MachOper* oper = mach->memory_operand();
1685 if (oper != NULL && oper != (MachOper*)-1) {
1686 // It has a unique memory operand. Find corresponding ideal mem node.
1687 Node* m = NULL;
1688 if (leaf->is_Mem()) {
1689 m = leaf;
1690 } else {
1691 m = _mem_node;
1692 assert(m != NULL && m->is_Mem(), "expecting memory node");
1693 }
1694 const Type* mach_at = mach->adr_type();
1695 // DecodeN node consumed by an address may have different type
1696 // than its input. Don't compare types for such case.
1697 if (m->adr_type() != mach_at &&
1698 (m->in(MemNode::Address)->is_DecodeNarrowPtr() ||
1699 (m->in(MemNode::Address)->is_AddP() &&
1700 m->in(MemNode::Address)->in(AddPNode::Address)->is_DecodeNarrowPtr()) ||
1701 (m->in(MemNode::Address)->is_AddP() &&
1702 m->in(MemNode::Address)->in(AddPNode::Address)->is_AddP() &&
1703 m->in(MemNode::Address)->in(AddPNode::Address)->in(AddPNode::Address)->is_DecodeNarrowPtr()))) {
1704 mach_at = m->adr_type();
1705 }
1706 if (m->adr_type() != mach_at) {
1707 m->dump();
1708 tty->print_cr("mach:");
1709 mach->dump(1);
1710 }
1711 assert(m->adr_type() == mach_at, "matcher should not change adr type");
1712 }
1713 #endif
1714 }
1715
1716 // If the _leaf is an AddP, insert the base edge
1717 if (leaf->is_AddP()) {
1718 mach->ins_req(AddPNode::Base,leaf->in(AddPNode::Base));
1719 }
1720
1721 uint number_of_projections_prior = number_of_projections();
1722
1723 // Perform any 1-to-many expansions required
1724 MachNode *ex = mach->Expand(s, _projection_list, mem);
1725 if (ex != mach) {
1726 assert(ex->ideal_reg() == mach->ideal_reg(), "ideal types should match");
1727 if( ex->in(1)->is_Con() )
1728 ex->in(1)->set_req(0, C->root());
1729 // Remove old node from the graph
1730 for( uint i=0; i<mach->req(); i++ ) {
1731 mach->set_req(i,NULL);
1732 }
1733 #ifdef ASSERT
1734 _new2old_map.map(ex->_idx, s->_leaf);
1735 #endif
1736 }
1737
1738 // PhaseChaitin::fixup_spills will sometimes generate spill code
1739 // via the matcher. By the time, nodes have been wired into the CFG,
1740 // and any further nodes generated by expand rules will be left hanging
1741 // in space, and will not get emitted as output code. Catch this.
1742 // Also, catch any new register allocation constraints ("projections")
1743 // generated belatedly during spill code generation.
1744 if (_allocation_started) {
1745 guarantee(ex == mach, "no expand rules during spill generation");
1746 guarantee(number_of_projections_prior == number_of_projections(), "no allocation during spill generation");
1747 }
1748
1749 if (leaf->is_Con() || leaf->is_DecodeNarrowPtr()) {
1750 // Record the con for sharing
1751 _shared_nodes.map(leaf->_idx, ex);
1752 }
1753
1754 // Have mach nodes inherit GC barrier data
1755 if (leaf->is_LoadStore()) {
1756 mach->set_barrier_data(leaf->as_LoadStore()->barrier_data());
1757 } else if (leaf->is_Mem()) {
1758 mach->set_barrier_data(leaf->as_Mem()->barrier_data());
1759 }
1760
1761 return ex;
1762 }
1763
1764 void Matcher::handle_precedence_edges(Node* n, MachNode *mach) {
1765 for (uint i = n->req(); i < n->len(); i++) {
1766 if (n->in(i) != NULL) {
1767 mach->add_prec(n->in(i));
1768 }
1769 }
1770 }
1771
1772 void Matcher::ReduceInst_Chain_Rule( State *s, int rule, Node *&mem, MachNode *mach ) {
1773 // 'op' is what I am expecting to receive
1774 int op = _leftOp[rule];
1775 // Operand type to catch childs result
1776 // This is what my child will give me.
1777 int opnd_class_instance = s->_rule[op];
1778 // Choose between operand class or not.
1779 // This is what I will receive.
1780 int catch_op = (FIRST_OPERAND_CLASS <= op && op < NUM_OPERANDS) ? opnd_class_instance : op;
1781 // New rule for child. Chase operand classes to get the actual rule.
1782 int newrule = s->_rule[catch_op];
1783
1784 if( newrule < NUM_OPERANDS ) {
1785 // Chain from operand or operand class, may be output of shared node
1786 assert( 0 <= opnd_class_instance && opnd_class_instance < NUM_OPERANDS,
1787 "Bad AD file: Instruction chain rule must chain from operand");
1788 // Insert operand into array of operands for this instruction
1789 mach->_opnds[1] = s->MachOperGenerator(opnd_class_instance);
1790
1791 ReduceOper( s, newrule, mem, mach );
1792 } else {
1793 // Chain from the result of an instruction
1794 assert( newrule >= _LAST_MACH_OPER, "Do NOT chain from internal operand");
1795 mach->_opnds[1] = s->MachOperGenerator(_reduceOp[catch_op]);
1796 Node *mem1 = (Node*)1;
1797 debug_only(Node *save_mem_node = _mem_node;)
1798 mach->add_req( ReduceInst(s, newrule, mem1) );
1799 debug_only(_mem_node = save_mem_node;)
1800 }
1801 return;
1802 }
1803
1804
1805 uint Matcher::ReduceInst_Interior( State *s, int rule, Node *&mem, MachNode *mach, uint num_opnds ) {
1806 handle_precedence_edges(s->_leaf, mach);
1807
1808 if( s->_leaf->is_Load() ) {
1809 Node *mem2 = s->_leaf->in(MemNode::Memory);
1810 assert( mem == (Node*)1 || mem == mem2, "multiple Memories being matched at once?" );
1811 debug_only( if( mem == (Node*)1 ) _mem_node = s->_leaf;)
1812 mem = mem2;
1813 }
1814 if( s->_leaf->in(0) != NULL && s->_leaf->req() > 1) {
1815 if( mach->in(0) == NULL )
1816 mach->set_req(0, s->_leaf->in(0));
1817 }
1818
1819 // Now recursively walk the state tree & add operand list.
1820 for( uint i=0; i<2; i++ ) { // binary tree
1821 State *newstate = s->_kids[i];
1822 if( newstate == NULL ) break; // Might only have 1 child
1823 // 'op' is what I am expecting to receive
1824 int op;
1825 if( i == 0 ) {
1826 op = _leftOp[rule];
1827 } else {
1828 op = _rightOp[rule];
1829 }
1830 // Operand type to catch childs result
1831 // This is what my child will give me.
1832 int opnd_class_instance = newstate->_rule[op];
1833 // Choose between operand class or not.
1834 // This is what I will receive.
1835 int catch_op = (op >= FIRST_OPERAND_CLASS && op < NUM_OPERANDS) ? opnd_class_instance : op;
1836 // New rule for child. Chase operand classes to get the actual rule.
1837 int newrule = newstate->_rule[catch_op];
1838
1839 if( newrule < NUM_OPERANDS ) { // Operand/operandClass or internalOp/instruction?
1840 // Operand/operandClass
1841 // Insert operand into array of operands for this instruction
1842 mach->_opnds[num_opnds++] = newstate->MachOperGenerator(opnd_class_instance);
1843 ReduceOper( newstate, newrule, mem, mach );
1844
1845 } else { // Child is internal operand or new instruction
1846 if( newrule < _LAST_MACH_OPER ) { // internal operand or instruction?
1847 // internal operand --> call ReduceInst_Interior
1848 // Interior of complex instruction. Do nothing but recurse.
1849 num_opnds = ReduceInst_Interior( newstate, newrule, mem, mach, num_opnds );
1850 } else {
1851 // instruction --> call build operand( ) to catch result
1852 // --> ReduceInst( newrule )
1853 mach->_opnds[num_opnds++] = s->MachOperGenerator(_reduceOp[catch_op]);
1854 Node *mem1 = (Node*)1;
1855 debug_only(Node *save_mem_node = _mem_node;)
1856 mach->add_req( ReduceInst( newstate, newrule, mem1 ) );
1857 debug_only(_mem_node = save_mem_node;)
1858 }
1859 }
1860 assert( mach->_opnds[num_opnds-1], "" );
1861 }
1862 return num_opnds;
1863 }
1864
1865 // This routine walks the interior of possible complex operands.
1866 // At each point we check our children in the match tree:
1867 // (1) No children -
1868 // We are a leaf; add _leaf field as an input to the MachNode
1869 // (2) Child is an internal operand -
1870 // Skip over it ( do nothing )
1871 // (3) Child is an instruction -
1872 // Call ReduceInst recursively and
1873 // and instruction as an input to the MachNode
1874 void Matcher::ReduceOper( State *s, int rule, Node *&mem, MachNode *mach ) {
1875 assert( rule < _LAST_MACH_OPER, "called with operand rule" );
1876 State *kid = s->_kids[0];
1877 assert( kid == NULL || s->_leaf->in(0) == NULL, "internal operands have no control" );
1878
1879 // Leaf? And not subsumed?
1880 if( kid == NULL && !_swallowed[rule] ) {
1881 mach->add_req( s->_leaf ); // Add leaf pointer
1882 return; // Bail out
1883 }
1884
1885 if( s->_leaf->is_Load() ) {
1886 assert( mem == (Node*)1, "multiple Memories being matched at once?" );
1887 mem = s->_leaf->in(MemNode::Memory);
1888 debug_only(_mem_node = s->_leaf;)
1889 }
1890
1891 handle_precedence_edges(s->_leaf, mach);
1892
1893 if( s->_leaf->in(0) && s->_leaf->req() > 1) {
1894 if( !mach->in(0) )
1895 mach->set_req(0,s->_leaf->in(0));
1896 else {
1897 assert( s->_leaf->in(0) == mach->in(0), "same instruction, differing controls?" );
1898 }
1899 }
1900
1901 for( uint i=0; kid != NULL && i<2; kid = s->_kids[1], i++ ) { // binary tree
1902 int newrule;
1903 if( i == 0)
1904 newrule = kid->_rule[_leftOp[rule]];
1905 else
1906 newrule = kid->_rule[_rightOp[rule]];
1907
1908 if( newrule < _LAST_MACH_OPER ) { // Operand or instruction?
1909 // Internal operand; recurse but do nothing else
1910 ReduceOper( kid, newrule, mem, mach );
1911
1912 } else { // Child is a new instruction
1913 // Reduce the instruction, and add a direct pointer from this
1914 // machine instruction to the newly reduced one.
1915 Node *mem1 = (Node*)1;
1916 debug_only(Node *save_mem_node = _mem_node;)
1917 mach->add_req( ReduceInst( kid, newrule, mem1 ) );
1918 debug_only(_mem_node = save_mem_node;)
1919 }
1920 }
1921 }
1922
1923
1924 // -------------------------------------------------------------------------
1925 // Java-Java calling convention
1926 // (what you use when Java calls Java)
1927
1928 //------------------------------find_receiver----------------------------------
1929 // For a given signature, return the OptoReg for parameter 0.
1930 OptoReg::Name Matcher::find_receiver( bool is_outgoing ) {
1931 VMRegPair regs;
1932 BasicType sig_bt = T_OBJECT;
1933 calling_convention(&sig_bt, ®s, 1, is_outgoing);
1934 // Return argument 0 register. In the LP64 build pointers
1935 // take 2 registers, but the VM wants only the 'main' name.
1936 return OptoReg::as_OptoReg(regs.first());
1937 }
1938
1939 // This function identifies sub-graphs in which a 'load' node is
1940 // input to two different nodes, and such that it can be matched
1941 // with BMI instructions like blsi, blsr, etc.
1942 // Example : for b = -a[i] & a[i] can be matched to blsi r32, m32.
1943 // The graph is (AndL (SubL Con0 LoadL*) LoadL*), where LoadL*
1944 // refers to the same node.
1945 #ifdef X86
1946 // Match the generic fused operations pattern (op1 (op2 Con{ConType} mop) mop)
1947 // This is a temporary solution until we make DAGs expressible in ADL.
1948 template<typename ConType>
1949 class FusedPatternMatcher {
1950 Node* _op1_node;
1951 Node* _mop_node;
1952 int _con_op;
1953
1954 static int match_next(Node* n, int next_op, int next_op_idx) {
1955 if (n->in(1) == NULL || n->in(2) == NULL) {
1956 return -1;
1957 }
1958
1959 if (next_op_idx == -1) { // n is commutative, try rotations
1960 if (n->in(1)->Opcode() == next_op) {
1961 return 1;
1962 } else if (n->in(2)->Opcode() == next_op) {
1963 return 2;
1964 }
1965 } else {
1966 assert(next_op_idx > 0 && next_op_idx <= 2, "Bad argument index");
1967 if (n->in(next_op_idx)->Opcode() == next_op) {
1968 return next_op_idx;
1969 }
1970 }
1971 return -1;
1972 }
1973 public:
1974 FusedPatternMatcher(Node* op1_node, Node *mop_node, int con_op) :
1975 _op1_node(op1_node), _mop_node(mop_node), _con_op(con_op) { }
1976
1977 bool match(int op1, int op1_op2_idx, // op1 and the index of the op1->op2 edge, -1 if op1 is commutative
1978 int op2, int op2_con_idx, // op2 and the index of the op2->con edge, -1 if op2 is commutative
1979 typename ConType::NativeType con_value) {
1980 if (_op1_node->Opcode() != op1) {
1981 return false;
1982 }
1983 if (_mop_node->outcnt() > 2) {
1984 return false;
1985 }
1986 op1_op2_idx = match_next(_op1_node, op2, op1_op2_idx);
1987 if (op1_op2_idx == -1) {
1988 return false;
1989 }
1990 // Memory operation must be the other edge
1991 int op1_mop_idx = (op1_op2_idx & 1) + 1;
1992
1993 // Check that the mop node is really what we want
1994 if (_op1_node->in(op1_mop_idx) == _mop_node) {
1995 Node *op2_node = _op1_node->in(op1_op2_idx);
1996 if (op2_node->outcnt() > 1) {
1997 return false;
1998 }
1999 assert(op2_node->Opcode() == op2, "Should be");
2000 op2_con_idx = match_next(op2_node, _con_op, op2_con_idx);
2001 if (op2_con_idx == -1) {
2002 return false;
2003 }
2004 // Memory operation must be the other edge
2005 int op2_mop_idx = (op2_con_idx & 1) + 1;
2006 // Check that the memory operation is the same node
2007 if (op2_node->in(op2_mop_idx) == _mop_node) {
2008 // Now check the constant
2009 const Type* con_type = op2_node->in(op2_con_idx)->bottom_type();
2010 if (con_type != Type::TOP && ConType::as_self(con_type)->get_con() == con_value) {
2011 return true;
2012 }
2013 }
2014 }
2015 return false;
2016 }
2017 };
2018
2019
2020 bool Matcher::is_bmi_pattern(Node *n, Node *m) {
2021 if (n != NULL && m != NULL) {
2022 if (m->Opcode() == Op_LoadI) {
2023 FusedPatternMatcher<TypeInt> bmii(n, m, Op_ConI);
2024 return bmii.match(Op_AndI, -1, Op_SubI, 1, 0) ||
2025 bmii.match(Op_AndI, -1, Op_AddI, -1, -1) ||
2026 bmii.match(Op_XorI, -1, Op_AddI, -1, -1);
2027 } else if (m->Opcode() == Op_LoadL) {
2028 FusedPatternMatcher<TypeLong> bmil(n, m, Op_ConL);
2029 return bmil.match(Op_AndL, -1, Op_SubL, 1, 0) ||
2030 bmil.match(Op_AndL, -1, Op_AddL, -1, -1) ||
2031 bmil.match(Op_XorL, -1, Op_AddL, -1, -1);
2032 }
2033 }
2034 return false;
2035 }
2036 #endif // X86
2037
2038 bool Matcher::clone_base_plus_offset_address(AddPNode* m, Matcher::MStack& mstack, VectorSet& address_visited) {
2039 Node *off = m->in(AddPNode::Offset);
2040 if (off->is_Con()) {
2041 address_visited.test_set(m->_idx); // Flag as address_visited
2042 mstack.push(m->in(AddPNode::Address), Pre_Visit);
2043 // Clone X+offset as it also folds into most addressing expressions
2044 mstack.push(off, Visit);
2045 mstack.push(m->in(AddPNode::Base), Pre_Visit);
2046 return true;
2047 }
2048 return false;
2049 }
2050
2051 // A method-klass-holder may be passed in the inline_cache_reg
2052 // and then expanded into the inline_cache_reg and a method_oop register
2053 // defined in ad_<arch>.cpp
2054
2055 //------------------------------find_shared------------------------------------
2056 // Set bits if Node is shared or otherwise a root
2057 void Matcher::find_shared( Node *n ) {
2058 // Allocate stack of size C->live_nodes() * 2 to avoid frequent realloc
2059 MStack mstack(C->live_nodes() * 2);
2060 // Mark nodes as address_visited if they are inputs to an address expression
2061 VectorSet address_visited(Thread::current()->resource_area());
2062 mstack.push(n, Visit); // Don't need to pre-visit root node
2063 while (mstack.is_nonempty()) {
2064 n = mstack.node(); // Leave node on stack
2065 Node_State nstate = mstack.state();
2066 uint nop = n->Opcode();
2067 if (nstate == Pre_Visit) {
2068 if (address_visited.test(n->_idx)) { // Visited in address already?
2069 // Flag as visited and shared now.
2070 set_visited(n);
2071 }
2072 if (is_visited(n)) { // Visited already?
2073 // Node is shared and has no reason to clone. Flag it as shared.
2074 // This causes it to match into a register for the sharing.
2075 set_shared(n); // Flag as shared and
2076 if (n->is_DecodeNarrowPtr()) {
2077 // Oop field/array element loads must be shared but since
2078 // they are shared through a DecodeN they may appear to have
2079 // a single use so force sharing here.
2080 set_shared(n->in(1));
2081 }
2082 mstack.pop(); // remove node from stack
2083 continue;
2084 }
2085 nstate = Visit; // Not already visited; so visit now
2086 }
2087 if (nstate == Visit) {
2088 mstack.set_state(Post_Visit);
2089 set_visited(n); // Flag as visited now
2090 bool mem_op = false;
2091 int mem_addr_idx = MemNode::Address;
2092 bool gc_handled = BarrierSet::barrier_set()->barrier_set_c2()->matcher_find_shared_visit(this, mstack, n, nop, mem_op, mem_addr_idx);
2093 if (!gc_handled) {
2094 if (find_shared_visit(mstack, n, nop, mem_op, mem_addr_idx)) {
2095 continue;
2096 }
2097 }
2098 for(int i = n->req() - 1; i >= 0; --i) { // For my children
2099 Node *m = n->in(i); // Get ith input
2100 if (m == NULL) continue; // Ignore NULLs
2101 uint mop = m->Opcode();
2102
2103 // Must clone all producers of flags, or we will not match correctly.
2104 // Suppose a compare setting int-flags is shared (e.g., a switch-tree)
2105 // then it will match into an ideal Op_RegFlags. Alas, the fp-flags
2106 // are also there, so we may match a float-branch to int-flags and
2107 // expect the allocator to haul the flags from the int-side to the
2108 // fp-side. No can do.
2109 if( _must_clone[mop] ) {
2110 mstack.push(m, Visit);
2111 continue; // for(int i = ...)
2112 }
2113
2114 // if 'n' and 'm' are part of a graph for BMI instruction, clone this node.
2115 #ifdef X86
2116 if (UseBMI1Instructions && is_bmi_pattern(n, m)) {
2117 mstack.push(m, Visit);
2118 continue;
2119 }
2120 #endif
2121
2122 // Clone addressing expressions as they are "free" in memory access instructions
2123 if (mem_op && i == mem_addr_idx && mop == Op_AddP &&
2124 // When there are other uses besides address expressions
2125 // put it on stack and mark as shared.
2126 !is_visited(m)) {
2127 // Some inputs for address expression are not put on stack
2128 // to avoid marking them as shared and forcing them into register
2129 // if they are used only in address expressions.
2130 // But they should be marked as shared if there are other uses
2131 // besides address expressions.
2132
2133 if (clone_address_expressions(m->as_AddP(), mstack, address_visited)) {
2134 continue;
2135 }
2136 } // if( mem_op &&
2137 mstack.push(m, Pre_Visit);
2138 } // for(int i = ...)
2139 }
2140 else if (nstate == Alt_Post_Visit) {
2141 mstack.pop(); // Remove node from stack
2142 // We cannot remove the Cmp input from the Bool here, as the Bool may be
2143 // shared and all users of the Bool need to move the Cmp in parallel.
2144 // This leaves both the Bool and the If pointing at the Cmp. To
2145 // prevent the Matcher from trying to Match the Cmp along both paths
2146 // BoolNode::match_edge always returns a zero.
2147
2148 // We reorder the Op_If in a pre-order manner, so we can visit without
2149 // accidentally sharing the Cmp (the Bool and the If make 2 users).
2150 n->add_req( n->in(1)->in(1) ); // Add the Cmp next to the Bool
2151 }
2152 else if (nstate == Post_Visit) {
2153 mstack.pop(); // Remove node from stack
2154
2155 // Now hack a few special opcodes
2156 uint opcode = n->Opcode();
2157 bool gc_handled = BarrierSet::barrier_set()->barrier_set_c2()->matcher_find_shared_post_visit(this, n, opcode);
2158 if (!gc_handled) {
2159 find_shared_post_visit(n, opcode);
2160 }
2161 }
2162 else {
2163 ShouldNotReachHere();
2164 }
2165 } // end of while (mstack.is_nonempty())
2166 }
2167
2168 bool Matcher::find_shared_visit(MStack& mstack, Node* n, uint opcode, bool& mem_op, int& mem_addr_idx) {
2169 switch(opcode) { // Handle some opcodes special
2170 case Op_Phi: // Treat Phis as shared roots
2171 case Op_Parm:
2172 case Op_Proj: // All handled specially during matching
2173 case Op_SafePointScalarObject:
2174 set_shared(n);
2175 set_dontcare(n);
2176 break;
2177 case Op_If:
2178 case Op_CountedLoopEnd:
2179 mstack.set_state(Alt_Post_Visit); // Alternative way
2180 // Convert (If (Bool (CmpX A B))) into (If (Bool) (CmpX A B)). Helps
2181 // with matching cmp/branch in 1 instruction. The Matcher needs the
2182 // Bool and CmpX side-by-side, because it can only get at constants
2183 // that are at the leaves of Match trees, and the Bool's condition acts
2184 // as a constant here.
2185 mstack.push(n->in(1), Visit); // Clone the Bool
2186 mstack.push(n->in(0), Pre_Visit); // Visit control input
2187 return true; // while (mstack.is_nonempty())
2188 case Op_ConvI2D: // These forms efficiently match with a prior
2189 case Op_ConvI2F: // Load but not a following Store
2190 if( n->in(1)->is_Load() && // Prior load
2191 n->outcnt() == 1 && // Not already shared
2192 n->unique_out()->is_Store() ) // Following store
2193 set_shared(n); // Force it to be a root
2194 break;
2195 case Op_ReverseBytesI:
2196 case Op_ReverseBytesL:
2197 if( n->in(1)->is_Load() && // Prior load
2198 n->outcnt() == 1 ) // Not already shared
2199 set_shared(n); // Force it to be a root
2200 break;
2201 case Op_BoxLock: // Cant match until we get stack-regs in ADLC
2202 case Op_IfFalse:
2203 case Op_IfTrue:
2204 case Op_MachProj:
2205 case Op_MergeMem:
2206 case Op_Catch:
2207 case Op_CatchProj:
2208 case Op_CProj:
2209 case Op_JumpProj:
2210 case Op_JProj:
2211 case Op_NeverBranch:
2212 set_dontcare(n);
2213 break;
2214 case Op_Jump:
2215 mstack.push(n->in(1), Pre_Visit); // Switch Value (could be shared)
2216 mstack.push(n->in(0), Pre_Visit); // Visit Control input
2217 return true; // while (mstack.is_nonempty())
2218 case Op_StrComp:
2219 case Op_StrEquals:
2220 case Op_StrIndexOf:
2221 case Op_StrIndexOfChar:
2222 case Op_AryEq:
2223 case Op_HasNegatives:
2224 case Op_StrInflatedCopy:
2225 case Op_StrCompressedCopy:
2226 case Op_EncodeISOArray:
2227 case Op_FmaD:
2228 case Op_FmaF:
2229 case Op_FmaVD:
2230 case Op_FmaVF:
2231 set_shared(n); // Force result into register (it will be anyways)
2232 break;
2233 case Op_ConP: { // Convert pointers above the centerline to NUL
2234 TypeNode *tn = n->as_Type(); // Constants derive from type nodes
2235 const TypePtr* tp = tn->type()->is_ptr();
2236 if (tp->_ptr == TypePtr::AnyNull) {
2237 tn->set_type(TypePtr::NULL_PTR);
2238 }
2239 break;
2240 }
2241 case Op_ConN: { // Convert narrow pointers above the centerline to NUL
2242 TypeNode *tn = n->as_Type(); // Constants derive from type nodes
2243 const TypePtr* tp = tn->type()->make_ptr();
2244 if (tp && tp->_ptr == TypePtr::AnyNull) {
2245 tn->set_type(TypeNarrowOop::NULL_PTR);
2246 }
2247 break;
2248 }
2249 case Op_Binary: // These are introduced in the Post_Visit state.
2250 ShouldNotReachHere();
2251 break;
2252 case Op_ClearArray:
2253 case Op_SafePoint:
2254 mem_op = true;
2255 break;
2256 default:
2257 if( n->is_Store() ) {
2258 // Do match stores, despite no ideal reg
2259 mem_op = true;
2260 break;
2261 }
2262 if( n->is_Mem() ) { // Loads and LoadStores
2263 mem_op = true;
2264 // Loads must be root of match tree due to prior load conflict
2265 if( C->subsume_loads() == false )
2266 set_shared(n);
2267 }
2268 // Fall into default case
2269 if( !n->ideal_reg() )
2270 set_dontcare(n); // Unmatchable Nodes
2271 } // end_switch
2272 return false;
2273 }
2274
2275 void Matcher::find_shared_post_visit(Node* n, uint opcode) {
2276 switch(opcode) { // Handle some opcodes special
2277 case Op_StorePConditional:
2278 case Op_StoreIConditional:
2279 case Op_StoreLConditional:
2280 case Op_CompareAndExchangeB:
2281 case Op_CompareAndExchangeS:
2282 case Op_CompareAndExchangeI:
2283 case Op_CompareAndExchangeL:
2284 case Op_CompareAndExchangeP:
2285 case Op_CompareAndExchangeN:
2286 case Op_WeakCompareAndSwapB:
2287 case Op_WeakCompareAndSwapS:
2288 case Op_WeakCompareAndSwapI:
2289 case Op_WeakCompareAndSwapL:
2290 case Op_WeakCompareAndSwapP:
2291 case Op_WeakCompareAndSwapN:
2292 case Op_CompareAndSwapB:
2293 case Op_CompareAndSwapS:
2294 case Op_CompareAndSwapI:
2295 case Op_CompareAndSwapL:
2296 case Op_CompareAndSwapP:
2297 case Op_CompareAndSwapN: { // Convert trinary to binary-tree
2298 Node* newval = n->in(MemNode::ValueIn);
2299 Node* oldval = n->in(LoadStoreConditionalNode::ExpectedIn);
2300 Node* pair = new BinaryNode(oldval, newval);
2301 n->set_req(MemNode::ValueIn, pair);
2302 n->del_req(LoadStoreConditionalNode::ExpectedIn);
2303 break;
2304 }
2305 case Op_CMoveD: // Convert trinary to binary-tree
2306 case Op_CMoveF:
2307 case Op_CMoveI:
2308 case Op_CMoveL:
2309 case Op_CMoveN:
2310 case Op_CMoveP:
2311 case Op_CMoveVF:
2312 case Op_CMoveVD: {
2313 // Restructure into a binary tree for Matching. It's possible that
2314 // we could move this code up next to the graph reshaping for IfNodes
2315 // or vice-versa, but I do not want to debug this for Ladybird.
2316 // 10/2/2000 CNC.
2317 Node* pair1 = new BinaryNode(n->in(1), n->in(1)->in(1));
2318 n->set_req(1, pair1);
2319 Node* pair2 = new BinaryNode(n->in(2), n->in(3));
2320 n->set_req(2, pair2);
2321 n->del_req(3);
2322 break;
2323 }
2324 case Op_LoopLimit: {
2325 Node* pair1 = new BinaryNode(n->in(1), n->in(2));
2326 n->set_req(1, pair1);
2327 n->set_req(2, n->in(3));
2328 n->del_req(3);
2329 break;
2330 }
2331 case Op_StrEquals:
2332 case Op_StrIndexOfChar: {
2333 Node* pair1 = new BinaryNode(n->in(2), n->in(3));
2334 n->set_req(2, pair1);
2335 n->set_req(3, n->in(4));
2336 n->del_req(4);
2337 break;
2338 }
2339 case Op_StrComp:
2340 case Op_StrIndexOf: {
2341 Node* pair1 = new BinaryNode(n->in(2), n->in(3));
2342 n->set_req(2, pair1);
2343 Node* pair2 = new BinaryNode(n->in(4),n->in(5));
2344 n->set_req(3, pair2);
2345 n->del_req(5);
2346 n->del_req(4);
2347 break;
2348 }
2349 case Op_StrCompressedCopy:
2350 case Op_StrInflatedCopy:
2351 case Op_EncodeISOArray: {
2352 // Restructure into a binary tree for Matching.
2353 Node* pair = new BinaryNode(n->in(3), n->in(4));
2354 n->set_req(3, pair);
2355 n->del_req(4);
2356 break;
2357 }
2358 case Op_FmaD:
2359 case Op_FmaF:
2360 case Op_FmaVD:
2361 case Op_FmaVF: {
2362 // Restructure into a binary tree for Matching.
2363 Node* pair = new BinaryNode(n->in(1), n->in(2));
2364 n->set_req(2, pair);
2365 n->set_req(1, n->in(3));
2366 n->del_req(3);
2367 break;
2368 }
2369 case Op_MulAddS2I: {
2370 Node* pair1 = new BinaryNode(n->in(1), n->in(2));
2371 Node* pair2 = new BinaryNode(n->in(3), n->in(4));
2372 n->set_req(1, pair1);
2373 n->set_req(2, pair2);
2374 n->del_req(4);
2375 n->del_req(3);
2376 break;
2377 }
2378 default:
2379 break;
2380 }
2381 }
2382
2383 #ifdef ASSERT
2384 // machine-independent root to machine-dependent root
2385 void Matcher::dump_old2new_map() {
2386 _old2new_map.dump();
2387 }
2388 #endif
2389
2390 //---------------------------collect_null_checks-------------------------------
2391 // Find null checks in the ideal graph; write a machine-specific node for
2392 // it. Used by later implicit-null-check handling. Actually collects
2393 // either an IfTrue or IfFalse for the common NOT-null path, AND the ideal
2394 // value being tested.
2395 void Matcher::collect_null_checks( Node *proj, Node *orig_proj ) {
2396 Node *iff = proj->in(0);
2397 if( iff->Opcode() == Op_If ) {
2398 // During matching If's have Bool & Cmp side-by-side
2399 BoolNode *b = iff->in(1)->as_Bool();
2400 Node *cmp = iff->in(2);
2401 int opc = cmp->Opcode();
2402 if (opc != Op_CmpP && opc != Op_CmpN) return;
2403
2404 const Type* ct = cmp->in(2)->bottom_type();
2405 if (ct == TypePtr::NULL_PTR ||
2406 (opc == Op_CmpN && ct == TypeNarrowOop::NULL_PTR)) {
2407
2408 bool push_it = false;
2409 if( proj->Opcode() == Op_IfTrue ) {
2410 #ifndef PRODUCT
2411 extern int all_null_checks_found;
2412 all_null_checks_found++;
2413 #endif
2414 if( b->_test._test == BoolTest::ne ) {
2415 push_it = true;
2416 }
2417 } else {
2418 assert( proj->Opcode() == Op_IfFalse, "" );
2419 if( b->_test._test == BoolTest::eq ) {
2420 push_it = true;
2421 }
2422 }
2423 if( push_it ) {
2424 _null_check_tests.push(proj);
2425 Node* val = cmp->in(1);
2426 #ifdef _LP64
2427 if (val->bottom_type()->isa_narrowoop() &&
2428 !Matcher::narrow_oop_use_complex_address()) {
2429 //
2430 // Look for DecodeN node which should be pinned to orig_proj.
2431 // On platforms (Sparc) which can not handle 2 adds
2432 // in addressing mode we have to keep a DecodeN node and
2433 // use it to do implicit NULL check in address.
2434 //
2435 // DecodeN node was pinned to non-null path (orig_proj) during
2436 // CastPP transformation in final_graph_reshaping_impl().
2437 //
2438 uint cnt = orig_proj->outcnt();
2439 for (uint i = 0; i < orig_proj->outcnt(); i++) {
2440 Node* d = orig_proj->raw_out(i);
2441 if (d->is_DecodeN() && d->in(1) == val) {
2442 val = d;
2443 val->set_req(0, NULL); // Unpin now.
2444 // Mark this as special case to distinguish from
2445 // a regular case: CmpP(DecodeN, NULL).
2446 val = (Node*)(((intptr_t)val) | 1);
2447 break;
2448 }
2449 }
2450 }
2451 #endif
2452 _null_check_tests.push(val);
2453 }
2454 }
2455 }
2456 }
2457
2458 //---------------------------validate_null_checks------------------------------
2459 // Its possible that the value being NULL checked is not the root of a match
2460 // tree. If so, I cannot use the value in an implicit null check.
2461 void Matcher::validate_null_checks( ) {
2462 uint cnt = _null_check_tests.size();
2463 for( uint i=0; i < cnt; i+=2 ) {
2464 Node *test = _null_check_tests[i];
2465 Node *val = _null_check_tests[i+1];
2466 bool is_decoden = ((intptr_t)val) & 1;
2467 val = (Node*)(((intptr_t)val) & ~1);
2468 if (has_new_node(val)) {
2469 Node* new_val = new_node(val);
2470 if (is_decoden) {
2471 assert(val->is_DecodeNarrowPtr() && val->in(0) == NULL, "sanity");
2472 // Note: new_val may have a control edge if
2473 // the original ideal node DecodeN was matched before
2474 // it was unpinned in Matcher::collect_null_checks().
2475 // Unpin the mach node and mark it.
2476 new_val->set_req(0, NULL);
2477 new_val = (Node*)(((intptr_t)new_val) | 1);
2478 }
2479 // Is a match-tree root, so replace with the matched value
2480 _null_check_tests.map(i+1, new_val);
2481 } else {
2482 // Yank from candidate list
2483 _null_check_tests.map(i+1,_null_check_tests[--cnt]);
2484 _null_check_tests.map(i,_null_check_tests[--cnt]);
2485 _null_check_tests.pop();
2486 _null_check_tests.pop();
2487 i-=2;
2488 }
2489 }
2490 }
2491
2492 bool Matcher::gen_narrow_oop_implicit_null_checks() {
2493 // Advice matcher to perform null checks on the narrow oop side.
2494 // Implicit checks are not possible on the uncompressed oop side anyway
2495 // (at least not for read accesses).
2496 // Performs significantly better (especially on Power 6).
2497 if (!os::zero_page_read_protected()) {
2498 return true;
2499 }
2500 return CompressedOops::use_implicit_null_checks() &&
2501 (narrow_oop_use_complex_address() ||
2502 CompressedOops::base() != NULL);
2503 }
2504
2505 // Used by the DFA in dfa_xxx.cpp. Check for a following barrier or
2506 // atomic instruction acting as a store_load barrier without any
2507 // intervening volatile load, and thus we don't need a barrier here.
2508 // We retain the Node to act as a compiler ordering barrier.
2509 bool Matcher::post_store_load_barrier(const Node* vmb) {
2510 Compile* C = Compile::current();
2511 assert(vmb->is_MemBar(), "");
2512 assert(vmb->Opcode() != Op_MemBarAcquire && vmb->Opcode() != Op_LoadFence, "");
2513 const MemBarNode* membar = vmb->as_MemBar();
2514
2515 // Get the Ideal Proj node, ctrl, that can be used to iterate forward
2516 Node* ctrl = NULL;
2517 for (DUIterator_Fast imax, i = membar->fast_outs(imax); i < imax; i++) {
2518 Node* p = membar->fast_out(i);
2519 assert(p->is_Proj(), "only projections here");
2520 if ((p->as_Proj()->_con == TypeFunc::Control) &&
2521 !C->node_arena()->contains(p)) { // Unmatched old-space only
2522 ctrl = p;
2523 break;
2524 }
2525 }
2526 assert((ctrl != NULL), "missing control projection");
2527
2528 for (DUIterator_Fast jmax, j = ctrl->fast_outs(jmax); j < jmax; j++) {
2529 Node *x = ctrl->fast_out(j);
2530 int xop = x->Opcode();
2531
2532 // We don't need current barrier if we see another or a lock
2533 // before seeing volatile load.
2534 //
2535 // Op_Fastunlock previously appeared in the Op_* list below.
2536 // With the advent of 1-0 lock operations we're no longer guaranteed
2537 // that a monitor exit operation contains a serializing instruction.
2538
2539 if (xop == Op_MemBarVolatile ||
2540 xop == Op_CompareAndExchangeB ||
2541 xop == Op_CompareAndExchangeS ||
2542 xop == Op_CompareAndExchangeI ||
2543 xop == Op_CompareAndExchangeL ||
2544 xop == Op_CompareAndExchangeP ||
2545 xop == Op_CompareAndExchangeN ||
2546 xop == Op_WeakCompareAndSwapB ||
2547 xop == Op_WeakCompareAndSwapS ||
2548 xop == Op_WeakCompareAndSwapL ||
2549 xop == Op_WeakCompareAndSwapP ||
2550 xop == Op_WeakCompareAndSwapN ||
2551 xop == Op_WeakCompareAndSwapI ||
2552 xop == Op_CompareAndSwapB ||
2553 xop == Op_CompareAndSwapS ||
2554 xop == Op_CompareAndSwapL ||
2555 xop == Op_CompareAndSwapP ||
2556 xop == Op_CompareAndSwapN ||
2557 xop == Op_CompareAndSwapI ||
2558 BarrierSet::barrier_set()->barrier_set_c2()->matcher_is_store_load_barrier(x, xop)) {
2559 return true;
2560 }
2561
2562 // Op_FastLock previously appeared in the Op_* list above.
2563 // With biased locking we're no longer guaranteed that a monitor
2564 // enter operation contains a serializing instruction.
2565 if ((xop == Op_FastLock) && !UseBiasedLocking) {
2566 return true;
2567 }
2568
2569 if (x->is_MemBar()) {
2570 // We must retain this membar if there is an upcoming volatile
2571 // load, which will be followed by acquire membar.
2572 if (xop == Op_MemBarAcquire || xop == Op_LoadFence) {
2573 return false;
2574 } else {
2575 // For other kinds of barriers, check by pretending we
2576 // are them, and seeing if we can be removed.
2577 return post_store_load_barrier(x->as_MemBar());
2578 }
2579 }
2580
2581 // probably not necessary to check for these
2582 if (x->is_Call() || x->is_SafePoint() || x->is_block_proj()) {
2583 return false;
2584 }
2585 }
2586 return false;
2587 }
2588
2589 // Check whether node n is a branch to an uncommon trap that we could
2590 // optimize as test with very high branch costs in case of going to
2591 // the uncommon trap. The code must be able to be recompiled to use
2592 // a cheaper test.
2593 bool Matcher::branches_to_uncommon_trap(const Node *n) {
2594 // Don't do it for natives, adapters, or runtime stubs
2595 Compile *C = Compile::current();
2596 if (!C->is_method_compilation()) return false;
2597
2598 assert(n->is_If(), "You should only call this on if nodes.");
2599 IfNode *ifn = n->as_If();
2600
2601 Node *ifFalse = NULL;
2602 for (DUIterator_Fast imax, i = ifn->fast_outs(imax); i < imax; i++) {
2603 if (ifn->fast_out(i)->is_IfFalse()) {
2604 ifFalse = ifn->fast_out(i);
2605 break;
2606 }
2607 }
2608 assert(ifFalse, "An If should have an ifFalse. Graph is broken.");
2609
2610 Node *reg = ifFalse;
2611 int cnt = 4; // We must protect against cycles. Limit to 4 iterations.
2612 // Alternatively use visited set? Seems too expensive.
2613 while (reg != NULL && cnt > 0) {
2614 CallNode *call = NULL;
2615 RegionNode *nxt_reg = NULL;
2616 for (DUIterator_Fast imax, i = reg->fast_outs(imax); i < imax; i++) {
2617 Node *o = reg->fast_out(i);
2618 if (o->is_Call()) {
2619 call = o->as_Call();
2620 }
2621 if (o->is_Region()) {
2622 nxt_reg = o->as_Region();
2623 }
2624 }
2625
2626 if (call &&
2627 call->entry_point() == SharedRuntime::uncommon_trap_blob()->entry_point()) {
2628 const Type* trtype = call->in(TypeFunc::Parms)->bottom_type();
2629 if (trtype->isa_int() && trtype->is_int()->is_con()) {
2630 jint tr_con = trtype->is_int()->get_con();
2631 Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(tr_con);
2632 Deoptimization::DeoptAction action = Deoptimization::trap_request_action(tr_con);
2633 assert((int)reason < (int)BitsPerInt, "recode bit map");
2634
2635 if (is_set_nth_bit(C->allowed_deopt_reasons(), (int)reason)
2636 && action != Deoptimization::Action_none) {
2637 // This uncommon trap is sure to recompile, eventually.
2638 // When that happens, C->too_many_traps will prevent
2639 // this transformation from happening again.
2640 return true;
2641 }
2642 }
2643 }
2644
2645 reg = nxt_reg;
2646 cnt--;
2647 }
2648
2649 return false;
2650 }
2651
2652 //=============================================================================
2653 //---------------------------State---------------------------------------------
2654 State::State(void) {
2655 #ifdef ASSERT
2656 _id = 0;
2657 _kids[0] = _kids[1] = (State*)(intptr_t) CONST64(0xcafebabecafebabe);
2658 _leaf = (Node*)(intptr_t) CONST64(0xbaadf00dbaadf00d);
2659 //memset(_cost, -1, sizeof(_cost));
2660 //memset(_rule, -1, sizeof(_rule));
2661 #endif
2662 memset(_valid, 0, sizeof(_valid));
2663 }
2664
2665 #ifdef ASSERT
2666 State::~State() {
2667 _id = 99;
2668 _kids[0] = _kids[1] = (State*)(intptr_t) CONST64(0xcafebabecafebabe);
2669 _leaf = (Node*)(intptr_t) CONST64(0xbaadf00dbaadf00d);
2670 memset(_cost, -3, sizeof(_cost));
2671 memset(_rule, -3, sizeof(_rule));
2672 }
2673 #endif
2674
2675 #ifndef PRODUCT
2676 //---------------------------dump----------------------------------------------
2677 void State::dump() {
2678 tty->print("\n");
2679 dump(0);
2680 }
2681
2682 void State::dump(int depth) {
2683 for( int j = 0; j < depth; j++ )
2684 tty->print(" ");
2685 tty->print("--N: ");
2686 _leaf->dump();
2687 uint i;
2688 for( i = 0; i < _LAST_MACH_OPER; i++ )
2689 // Check for valid entry
2690 if( valid(i) ) {
2691 for( int j = 0; j < depth; j++ )
2692 tty->print(" ");
2693 assert(_cost[i] != max_juint, "cost must be a valid value");
2694 assert(_rule[i] < _last_Mach_Node, "rule[i] must be valid rule");
2695 tty->print_cr("%s %d %s",
2696 ruleName[i], _cost[i], ruleName[_rule[i]] );
2697 }
2698 tty->cr();
2699
2700 for( i=0; i<2; i++ )
2701 if( _kids[i] )
2702 _kids[i]->dump(depth+1);
2703 }
2704 #endif