1 /*
2 * Copyright (c) 1997, 2013, 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 "ci/bcEscapeAnalyzer.hpp"
27 #include "compiler/oopMap.hpp"
28 #include "opto/callGenerator.hpp"
29 #include "opto/callnode.hpp"
30 #include "opto/escape.hpp"
31 #include "opto/locknode.hpp"
32 #include "opto/machnode.hpp"
33 #include "opto/matcher.hpp"
34 #include "opto/parse.hpp"
35 #include "opto/regalloc.hpp"
36 #include "opto/regmask.hpp"
37 #include "opto/rootnode.hpp"
38 #include "opto/runtime.hpp"
39
40 // Portions of code courtesy of Clifford Click
41
42 // Optimization - Graph Style
43
44 //=============================================================================
45 uint StartNode::size_of() const { return sizeof(*this); }
46 uint StartNode::cmp( const Node &n ) const
47 { return _domain == ((StartNode&)n)._domain; }
48 const Type *StartNode::bottom_type() const { return _domain; }
49 const Type *StartNode::Value(PhaseTransform *phase) const { return _domain; }
50 #ifndef PRODUCT
51 void StartNode::dump_spec(outputStream *st) const { st->print(" #"); _domain->dump_on(st);}
52 #endif
53
54 //------------------------------Ideal------------------------------------------
55 Node *StartNode::Ideal(PhaseGVN *phase, bool can_reshape){
56 return remove_dead_region(phase, can_reshape) ? this : NULL;
57 }
58
59 //------------------------------calling_convention-----------------------------
60 void StartNode::calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const {
61 Matcher::calling_convention( sig_bt, parm_regs, argcnt, false );
62 }
63
64 //------------------------------Registers--------------------------------------
65 const RegMask &StartNode::in_RegMask(uint) const {
66 return RegMask::Empty;
67 }
68
69 //------------------------------match------------------------------------------
70 // Construct projections for incoming parameters, and their RegMask info
71 Node *StartNode::match( const ProjNode *proj, const Matcher *match ) {
72 switch (proj->_con) {
73 case TypeFunc::Control:
74 case TypeFunc::I_O:
75 case TypeFunc::Memory:
76 return new (match->C) MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj);
77 case TypeFunc::FramePtr:
78 return new (match->C) MachProjNode(this,proj->_con,Matcher::c_frame_ptr_mask, Op_RegP);
79 case TypeFunc::ReturnAdr:
80 return new (match->C) MachProjNode(this,proj->_con,match->_return_addr_mask,Op_RegP);
81 case TypeFunc::Parms:
82 default: {
83 uint parm_num = proj->_con - TypeFunc::Parms;
84 const Type *t = _domain->field_at(proj->_con);
85 if (t->base() == Type::Half) // 2nd half of Longs and Doubles
86 return new (match->C) ConNode(Type::TOP);
87 uint ideal_reg = t->ideal_reg();
88 RegMask &rm = match->_calling_convention_mask[parm_num];
89 return new (match->C) MachProjNode(this,proj->_con,rm,ideal_reg);
90 }
91 }
92 return NULL;
93 }
94
95 //------------------------------StartOSRNode----------------------------------
96 // The method start node for an on stack replacement adapter
97
98 //------------------------------osr_domain-----------------------------
99 const TypeTuple *StartOSRNode::osr_domain() {
100 const Type **fields = TypeTuple::fields(2);
101 fields[TypeFunc::Parms+0] = TypeRawPtr::BOTTOM; // address of osr buffer
102
103 return TypeTuple::make(TypeFunc::Parms+1, fields);
104 }
105
106 //=============================================================================
107 const char * const ParmNode::names[TypeFunc::Parms+1] = {
108 "Control", "I_O", "Memory", "FramePtr", "ReturnAdr", "Parms"
109 };
110
111 #ifndef PRODUCT
112 void ParmNode::dump_spec(outputStream *st) const {
113 if( _con < TypeFunc::Parms ) {
114 st->print(names[_con]);
115 } else {
116 st->print("Parm%d: ",_con-TypeFunc::Parms);
117 // Verbose and WizardMode dump bottom_type for all nodes
118 if( !Verbose && !WizardMode ) bottom_type()->dump_on(st);
119 }
120 }
121 #endif
122
123 uint ParmNode::ideal_reg() const {
124 switch( _con ) {
125 case TypeFunc::Control : // fall through
126 case TypeFunc::I_O : // fall through
127 case TypeFunc::Memory : return 0;
128 case TypeFunc::FramePtr : // fall through
129 case TypeFunc::ReturnAdr: return Op_RegP;
130 default : assert( _con > TypeFunc::Parms, "" );
131 // fall through
132 case TypeFunc::Parms : {
133 // Type of argument being passed
134 const Type *t = in(0)->as_Start()->_domain->field_at(_con);
135 return t->ideal_reg();
136 }
137 }
138 ShouldNotReachHere();
139 return 0;
140 }
141
142 //=============================================================================
143 ReturnNode::ReturnNode(uint edges, Node *cntrl, Node *i_o, Node *memory, Node *frameptr, Node *retadr ) : Node(edges) {
144 init_req(TypeFunc::Control,cntrl);
145 init_req(TypeFunc::I_O,i_o);
146 init_req(TypeFunc::Memory,memory);
147 init_req(TypeFunc::FramePtr,frameptr);
148 init_req(TypeFunc::ReturnAdr,retadr);
149 }
150
151 Node *ReturnNode::Ideal(PhaseGVN *phase, bool can_reshape){
152 return remove_dead_region(phase, can_reshape) ? this : NULL;
153 }
154
155 const Type *ReturnNode::Value( PhaseTransform *phase ) const {
156 return ( phase->type(in(TypeFunc::Control)) == Type::TOP)
157 ? Type::TOP
158 : Type::BOTTOM;
159 }
160
161 // Do we Match on this edge index or not? No edges on return nodes
162 uint ReturnNode::match_edge(uint idx) const {
163 return 0;
164 }
165
166
167 #ifndef PRODUCT
168 void ReturnNode::dump_req(outputStream *st) const {
169 // Dump the required inputs, enclosed in '(' and ')'
170 uint i; // Exit value of loop
171 for (i = 0; i < req(); i++) { // For all required inputs
172 if (i == TypeFunc::Parms) st->print("returns");
173 if (in(i)) st->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx);
174 else st->print("_ ");
175 }
176 }
177 #endif
178
179 //=============================================================================
180 RethrowNode::RethrowNode(
181 Node* cntrl,
182 Node* i_o,
183 Node* memory,
184 Node* frameptr,
185 Node* ret_adr,
186 Node* exception
187 ) : Node(TypeFunc::Parms + 1) {
188 init_req(TypeFunc::Control , cntrl );
189 init_req(TypeFunc::I_O , i_o );
190 init_req(TypeFunc::Memory , memory );
191 init_req(TypeFunc::FramePtr , frameptr );
192 init_req(TypeFunc::ReturnAdr, ret_adr);
193 init_req(TypeFunc::Parms , exception);
194 }
195
196 Node *RethrowNode::Ideal(PhaseGVN *phase, bool can_reshape){
197 return remove_dead_region(phase, can_reshape) ? this : NULL;
198 }
199
200 const Type *RethrowNode::Value( PhaseTransform *phase ) const {
201 return (phase->type(in(TypeFunc::Control)) == Type::TOP)
202 ? Type::TOP
203 : Type::BOTTOM;
204 }
205
206 uint RethrowNode::match_edge(uint idx) const {
207 return 0;
208 }
209
210 #ifndef PRODUCT
211 void RethrowNode::dump_req(outputStream *st) const {
212 // Dump the required inputs, enclosed in '(' and ')'
213 uint i; // Exit value of loop
214 for (i = 0; i < req(); i++) { // For all required inputs
215 if (i == TypeFunc::Parms) st->print("exception");
216 if (in(i)) st->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx);
217 else st->print("_ ");
218 }
219 }
220 #endif
221
222 //=============================================================================
223 // Do we Match on this edge index or not? Match only target address & method
224 uint TailCallNode::match_edge(uint idx) const {
225 return TypeFunc::Parms <= idx && idx <= TypeFunc::Parms+1;
226 }
227
228 //=============================================================================
229 // Do we Match on this edge index or not? Match only target address & oop
230 uint TailJumpNode::match_edge(uint idx) const {
231 return TypeFunc::Parms <= idx && idx <= TypeFunc::Parms+1;
232 }
233
234 //=============================================================================
235 JVMState::JVMState(ciMethod* method, JVMState* caller) :
236 _method(method) {
237 assert(method != NULL, "must be valid call site");
238 _reexecute = Reexecute_Undefined;
239 debug_only(_bci = -99); // random garbage value
240 debug_only(_map = (SafePointNode*)-1);
241 _caller = caller;
242 _depth = 1 + (caller == NULL ? 0 : caller->depth());
243 _locoff = TypeFunc::Parms;
244 _stkoff = _locoff + _method->max_locals();
245 _monoff = _stkoff + _method->max_stack();
246 _scloff = _monoff;
247 _endoff = _monoff;
248 _sp = 0;
249 }
250 JVMState::JVMState(int stack_size) :
251 _method(NULL) {
252 _bci = InvocationEntryBci;
253 _reexecute = Reexecute_Undefined;
254 debug_only(_map = (SafePointNode*)-1);
255 _caller = NULL;
256 _depth = 1;
257 _locoff = TypeFunc::Parms;
258 _stkoff = _locoff;
259 _monoff = _stkoff + stack_size;
260 _scloff = _monoff;
261 _endoff = _monoff;
262 _sp = 0;
263 }
264
265 //--------------------------------of_depth-------------------------------------
266 JVMState* JVMState::of_depth(int d) const {
267 const JVMState* jvmp = this;
268 assert(0 < d && (uint)d <= depth(), "oob");
269 for (int skip = depth() - d; skip > 0; skip--) {
270 jvmp = jvmp->caller();
271 }
272 assert(jvmp->depth() == (uint)d, "found the right one");
273 return (JVMState*)jvmp;
274 }
275
276 //-----------------------------same_calls_as-----------------------------------
277 bool JVMState::same_calls_as(const JVMState* that) const {
278 if (this == that) return true;
279 if (this->depth() != that->depth()) return false;
280 const JVMState* p = this;
281 const JVMState* q = that;
282 for (;;) {
283 if (p->_method != q->_method) return false;
284 if (p->_method == NULL) return true; // bci is irrelevant
285 if (p->_bci != q->_bci) return false;
286 if (p->_reexecute != q->_reexecute) return false;
287 p = p->caller();
288 q = q->caller();
289 if (p == q) return true;
290 assert(p != NULL && q != NULL, "depth check ensures we don't run off end");
291 }
292 }
293
294 //------------------------------debug_start------------------------------------
295 uint JVMState::debug_start() const {
296 debug_only(JVMState* jvmroot = of_depth(1));
297 assert(jvmroot->locoff() <= this->locoff(), "youngest JVMState must be last");
298 return of_depth(1)->locoff();
299 }
300
301 //-------------------------------debug_end-------------------------------------
302 uint JVMState::debug_end() const {
303 debug_only(JVMState* jvmroot = of_depth(1));
304 assert(jvmroot->endoff() <= this->endoff(), "youngest JVMState must be last");
305 return endoff();
306 }
307
308 //------------------------------debug_depth------------------------------------
309 uint JVMState::debug_depth() const {
310 uint total = 0;
311 for (const JVMState* jvmp = this; jvmp != NULL; jvmp = jvmp->caller()) {
312 total += jvmp->debug_size();
313 }
314 return total;
315 }
316
317 #ifndef PRODUCT
318
319 //------------------------------format_helper----------------------------------
320 // Given an allocation (a Chaitin object) and a Node decide if the Node carries
321 // any defined value or not. If it does, print out the register or constant.
322 static void format_helper( PhaseRegAlloc *regalloc, outputStream* st, Node *n, const char *msg, uint i, GrowableArray<SafePointScalarObjectNode*> *scobjs ) {
323 if (n == NULL) { st->print(" NULL"); return; }
324 if (n->is_SafePointScalarObject()) {
325 // Scalar replacement.
326 SafePointScalarObjectNode* spobj = n->as_SafePointScalarObject();
327 scobjs->append_if_missing(spobj);
328 int sco_n = scobjs->find(spobj);
329 assert(sco_n >= 0, "");
330 st->print(" %s%d]=#ScObj" INT32_FORMAT, msg, i, sco_n);
331 return;
332 }
333 if (regalloc->node_regs_max_index() > 0 &&
334 OptoReg::is_valid(regalloc->get_reg_first(n))) { // Check for undefined
335 char buf[50];
336 regalloc->dump_register(n,buf);
337 st->print(" %s%d]=%s",msg,i,buf);
338 } else { // No register, but might be constant
339 const Type *t = n->bottom_type();
340 switch (t->base()) {
341 case Type::Int:
342 st->print(" %s%d]=#"INT32_FORMAT,msg,i,t->is_int()->get_con());
343 break;
344 case Type::AnyPtr:
345 assert( t == TypePtr::NULL_PTR || n->in_dump(), "" );
346 st->print(" %s%d]=#NULL",msg,i);
347 break;
348 case Type::AryPtr:
349 case Type::InstPtr:
350 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,t->isa_oopptr()->const_oop());
351 break;
352 case Type::KlassPtr:
353 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,t->make_ptr()->isa_klassptr()->klass());
354 break;
355 case Type::MetadataPtr:
356 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,t->make_ptr()->isa_metadataptr()->metadata());
357 break;
358 case Type::NarrowOop:
359 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,t->make_ptr()->isa_oopptr()->const_oop());
360 break;
361 case Type::RawPtr:
362 st->print(" %s%d]=#Raw" INTPTR_FORMAT,msg,i,t->is_rawptr());
363 break;
364 case Type::DoubleCon:
365 st->print(" %s%d]=#%fD",msg,i,t->is_double_constant()->_d);
366 break;
367 case Type::FloatCon:
368 st->print(" %s%d]=#%fF",msg,i,t->is_float_constant()->_f);
369 break;
370 case Type::Long:
371 st->print(" %s%d]=#"INT64_FORMAT,msg,i,t->is_long()->get_con());
372 break;
373 case Type::Half:
374 case Type::Top:
375 st->print(" %s%d]=_",msg,i);
376 break;
377 default: ShouldNotReachHere();
378 }
379 }
380 }
381
382 //------------------------------format-----------------------------------------
383 void JVMState::format(PhaseRegAlloc *regalloc, const Node *n, outputStream* st) const {
384 st->print(" #");
385 if (_method) {
386 _method->print_short_name(st);
387 st->print(" @ bci:%d ",_bci);
388 } else {
389 st->print_cr(" runtime stub ");
390 return;
391 }
392 if (n->is_MachSafePoint()) {
393 GrowableArray<SafePointScalarObjectNode*> scobjs;
394 MachSafePointNode *mcall = n->as_MachSafePoint();
395 uint i;
396 // Print locals
397 for (i = 0; i < (uint)loc_size(); i++)
398 format_helper(regalloc, st, mcall->local(this, i), "L[", i, &scobjs);
399 // Print stack
400 for (i = 0; i < (uint)stk_size(); i++) {
401 if ((uint)(_stkoff + i) >= mcall->len())
402 st->print(" oob ");
403 else
404 format_helper(regalloc, st, mcall->stack(this, i), "STK[", i, &scobjs);
405 }
406 for (i = 0; (int)i < nof_monitors(); i++) {
407 Node *box = mcall->monitor_box(this, i);
408 Node *obj = mcall->monitor_obj(this, i);
409 if (regalloc->node_regs_max_index() > 0 &&
410 OptoReg::is_valid(regalloc->get_reg_first(box))) {
411 box = BoxLockNode::box_node(box);
412 format_helper(regalloc, st, box, "MON-BOX[", i, &scobjs);
413 } else {
414 OptoReg::Name box_reg = BoxLockNode::reg(box);
415 st->print(" MON-BOX%d=%s+%d",
416 i,
417 OptoReg::regname(OptoReg::c_frame_pointer),
418 regalloc->reg2offset(box_reg));
419 }
420 const char* obj_msg = "MON-OBJ[";
421 if (EliminateLocks) {
422 if (BoxLockNode::box_node(box)->is_eliminated())
423 obj_msg = "MON-OBJ(LOCK ELIMINATED)[";
424 }
425 format_helper(regalloc, st, obj, obj_msg, i, &scobjs);
426 }
427
428 for (i = 0; i < (uint)scobjs.length(); i++) {
429 // Scalar replaced objects.
430 st->print_cr("");
431 st->print(" # ScObj" INT32_FORMAT " ", i);
432 SafePointScalarObjectNode* spobj = scobjs.at(i);
433 ciKlass* cik = spobj->bottom_type()->is_oopptr()->klass();
434 assert(cik->is_instance_klass() ||
435 cik->is_array_klass(), "Not supported allocation.");
436 ciInstanceKlass *iklass = NULL;
437 if (cik->is_instance_klass()) {
438 cik->print_name_on(st);
439 iklass = cik->as_instance_klass();
440 } else if (cik->is_type_array_klass()) {
441 cik->as_array_klass()->base_element_type()->print_name_on(st);
442 st->print("[%d]", spobj->n_fields());
443 } else if (cik->is_obj_array_klass()) {
444 ciKlass* cie = cik->as_obj_array_klass()->base_element_klass();
445 if (cie->is_instance_klass()) {
446 cie->print_name_on(st);
447 } else if (cie->is_type_array_klass()) {
448 cie->as_array_klass()->base_element_type()->print_name_on(st);
449 } else {
450 ShouldNotReachHere();
451 }
452 st->print("[%d]", spobj->n_fields());
453 int ndim = cik->as_array_klass()->dimension() - 1;
454 while (ndim-- > 0) {
455 st->print("[]");
456 }
457 }
458 st->print("={");
459 uint nf = spobj->n_fields();
460 if (nf > 0) {
461 uint first_ind = spobj->first_index(mcall->jvms());
462 Node* fld_node = mcall->in(first_ind);
463 ciField* cifield;
464 if (iklass != NULL) {
465 st->print(" [");
466 cifield = iklass->nonstatic_field_at(0);
467 cifield->print_name_on(st);
468 format_helper(regalloc, st, fld_node, ":", 0, &scobjs);
469 } else {
470 format_helper(regalloc, st, fld_node, "[", 0, &scobjs);
471 }
472 for (uint j = 1; j < nf; j++) {
473 fld_node = mcall->in(first_ind+j);
474 if (iklass != NULL) {
475 st->print(", [");
476 cifield = iklass->nonstatic_field_at(j);
477 cifield->print_name_on(st);
478 format_helper(regalloc, st, fld_node, ":", j, &scobjs);
479 } else {
480 format_helper(regalloc, st, fld_node, ", [", j, &scobjs);
481 }
482 }
483 }
484 st->print(" }");
485 }
486 }
487 st->print_cr("");
488 if (caller() != NULL) caller()->format(regalloc, n, st);
489 }
490
491
492 void JVMState::dump_spec(outputStream *st) const {
493 if (_method != NULL) {
494 bool printed = false;
495 if (!Verbose) {
496 // The JVMS dumps make really, really long lines.
497 // Take out the most boring parts, which are the package prefixes.
498 char buf[500];
499 stringStream namest(buf, sizeof(buf));
500 _method->print_short_name(&namest);
501 if (namest.count() < sizeof(buf)) {
502 const char* name = namest.base();
503 if (name[0] == ' ') ++name;
504 const char* endcn = strchr(name, ':'); // end of class name
505 if (endcn == NULL) endcn = strchr(name, '(');
506 if (endcn == NULL) endcn = name + strlen(name);
507 while (endcn > name && endcn[-1] != '.' && endcn[-1] != '/')
508 --endcn;
509 st->print(" %s", endcn);
510 printed = true;
511 }
512 }
513 if (!printed)
514 _method->print_short_name(st);
515 st->print(" @ bci:%d",_bci);
516 if(_reexecute == Reexecute_True)
517 st->print(" reexecute");
518 } else {
519 st->print(" runtime stub");
520 }
521 if (caller() != NULL) caller()->dump_spec(st);
522 }
523
524
525 void JVMState::dump_on(outputStream* st) const {
526 bool print_map = _map && !((uintptr_t)_map & 1) &&
527 ((caller() == NULL) || (caller()->map() != _map));
528 if (print_map) {
529 if (_map->len() > _map->req()) { // _map->has_exceptions()
530 Node* ex = _map->in(_map->req()); // _map->next_exception()
531 // skip the first one; it's already being printed
532 while (ex != NULL && ex->len() > ex->req()) {
533 ex = ex->in(ex->req()); // ex->next_exception()
534 ex->dump(1);
535 }
536 }
537 _map->dump(Verbose ? 2 : 1);
538 }
539 if (caller() != NULL) {
540 caller()->dump_on(st);
541 }
542 st->print("JVMS depth=%d loc=%d stk=%d arg=%d mon=%d scalar=%d end=%d mondepth=%d sp=%d bci=%d reexecute=%s method=",
543 depth(), locoff(), stkoff(), argoff(), monoff(), scloff(), endoff(), monitor_depth(), sp(), bci(), should_reexecute()?"true":"false");
544 if (_method == NULL) {
545 st->print_cr("(none)");
546 } else {
547 _method->print_name(st);
548 st->cr();
549 if (bci() >= 0 && bci() < _method->code_size()) {
550 st->print(" bc: ");
551 _method->print_codes_on(bci(), bci()+1, st);
552 }
553 }
554 }
555
556 // Extra way to dump a jvms from the debugger,
557 // to avoid a bug with C++ member function calls.
558 void dump_jvms(JVMState* jvms) {
559 jvms->dump();
560 }
561 #endif
562
563 //--------------------------clone_shallow--------------------------------------
564 JVMState* JVMState::clone_shallow(Compile* C) const {
565 JVMState* n = has_method() ? new (C) JVMState(_method, _caller) : new (C) JVMState(0);
566 n->set_bci(_bci);
567 n->_reexecute = _reexecute;
568 n->set_locoff(_locoff);
569 n->set_stkoff(_stkoff);
570 n->set_monoff(_monoff);
571 n->set_scloff(_scloff);
572 n->set_endoff(_endoff);
573 n->set_sp(_sp);
574 n->set_map(_map);
575 return n;
576 }
577
578 //---------------------------clone_deep----------------------------------------
579 JVMState* JVMState::clone_deep(Compile* C) const {
580 JVMState* n = clone_shallow(C);
581 for (JVMState* p = n; p->_caller != NULL; p = p->_caller) {
582 p->_caller = p->_caller->clone_shallow(C);
583 }
584 assert(n->depth() == depth(), "sanity");
585 assert(n->debug_depth() == debug_depth(), "sanity");
586 return n;
587 }
588
589 /**
590 * Reset map for all callers
591 */
592 void JVMState::set_map_deep(SafePointNode* map) {
593 for (JVMState* p = this; p->_caller != NULL; p = p->_caller) {
594 p->set_map(map);
595 }
596 }
597
598 // Adapt offsets in in-array after adding or removing an edge.
599 // Prerequisite is that the JVMState is used by only one node.
600 void JVMState::adapt_position(int delta) {
601 for (JVMState* jvms = this; jvms != NULL; jvms = jvms->caller()) {
602 jvms->set_locoff(jvms->locoff() + delta);
603 jvms->set_stkoff(jvms->stkoff() + delta);
604 jvms->set_monoff(jvms->monoff() + delta);
605 jvms->set_scloff(jvms->scloff() + delta);
606 jvms->set_endoff(jvms->endoff() + delta);
607 }
608 }
609
610 // Mirror the stack size calculation in the deopt code
611 // How much stack space would we need at this point in the program in
612 // case of deoptimization?
613 int JVMState::interpreter_frame_size() const {
614 const JVMState* jvms = this;
615 int size = 0;
616 int callee_parameters = 0;
617 int callee_locals = 0;
618 int popframe_extra_args = 0;
619
620 if (JvmtiExport::can_pop_frame()) {
621 ciMethod* method = this->method();
622 int bci = this->bci();
623 popframe_extra_args = MAX2(-method->get_stack_effect_if_at_invoke(bci), 0);
624 }
625
626 while (jvms != NULL) {
627 int locks = jvms->nof_monitors();
628 int temps = jvms->stk_size();
629 bool is_top_frame = (jvms->caller() == NULL);
630 ciMethod* method = jvms->method();
631
632 int frame_size = BytesPerWord * Interpreter::size_activation(method->max_stack(),
633 temps + callee_parameters,
634 popframe_extra_args,
635 locks,
636 callee_parameters,
637 callee_locals,
638 is_top_frame);
639 size += frame_size;
640
641 callee_parameters = method->size_of_parameters();
642 callee_locals = method->max_locals();
643 popframe_extra_args = 0;
644 jvms = jvms->caller();
645 }
646 return size + Deoptimization::last_frame_adjust(0, callee_locals) * BytesPerWord;
647 }
648
649 //=============================================================================
650 uint CallNode::cmp( const Node &n ) const
651 { return _tf == ((CallNode&)n)._tf && _jvms == ((CallNode&)n)._jvms; }
652 #ifndef PRODUCT
653 void CallNode::dump_req(outputStream *st) const {
654 // Dump the required inputs, enclosed in '(' and ')'
655 uint i; // Exit value of loop
656 for (i = 0; i < req(); i++) { // For all required inputs
657 if (i == TypeFunc::Parms) st->print("(");
658 if (in(i)) st->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx);
659 else st->print("_ ");
660 }
661 st->print(")");
662 }
663
664 void CallNode::dump_spec(outputStream *st) const {
665 st->print(" ");
666 tf()->dump_on(st);
667 if (_cnt != COUNT_UNKNOWN) st->print(" C=%f",_cnt);
668 if (jvms() != NULL) jvms()->dump_spec(st);
669 }
670 #endif
671
672 const Type *CallNode::bottom_type() const { return tf()->range(); }
673 const Type *CallNode::Value(PhaseTransform *phase) const {
674 if (phase->type(in(0)) == Type::TOP) return Type::TOP;
675 return tf()->range();
676 }
677
678 //------------------------------calling_convention-----------------------------
679 void CallNode::calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const {
680 // Use the standard compiler calling convention
681 Matcher::calling_convention( sig_bt, parm_regs, argcnt, true );
682 }
683
684
685 //------------------------------match------------------------------------------
686 // Construct projections for control, I/O, memory-fields, ..., and
687 // return result(s) along with their RegMask info
688 Node *CallNode::match( const ProjNode *proj, const Matcher *match ) {
689 switch (proj->_con) {
690 case TypeFunc::Control:
691 case TypeFunc::I_O:
692 case TypeFunc::Memory:
693 return new (match->C) MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj);
694
695 case TypeFunc::Parms+1: // For LONG & DOUBLE returns
696 assert(tf()->_range->field_at(TypeFunc::Parms+1) == Type::HALF, "");
697 // 2nd half of doubles and longs
698 return new (match->C) MachProjNode(this,proj->_con, RegMask::Empty, (uint)OptoReg::Bad);
699
700 case TypeFunc::Parms: { // Normal returns
701 uint ideal_reg = tf()->range()->field_at(TypeFunc::Parms)->ideal_reg();
702 OptoRegPair regs = is_CallRuntime()
703 ? match->c_return_value(ideal_reg,true) // Calls into C runtime
704 : match-> return_value(ideal_reg,true); // Calls into compiled Java code
705 RegMask rm = RegMask(regs.first());
706 if( OptoReg::is_valid(regs.second()) )
707 rm.Insert( regs.second() );
708 return new (match->C) MachProjNode(this,proj->_con,rm,ideal_reg);
709 }
710
711 case TypeFunc::ReturnAdr:
712 case TypeFunc::FramePtr:
713 default:
714 ShouldNotReachHere();
715 }
716 return NULL;
717 }
718
719 // Do we Match on this edge index or not? Match no edges
720 uint CallNode::match_edge(uint idx) const {
721 return 0;
722 }
723
724 //
725 // Determine whether the call could modify the field of the specified
726 // instance at the specified offset.
727 //
728 bool CallNode::may_modify(const TypeOopPtr *t_oop, PhaseTransform *phase) {
729 assert((t_oop != NULL), "sanity");
730 if (t_oop->is_known_instance()) {
731 // The instance_id is set only for scalar-replaceable allocations which
732 // are not passed as arguments according to Escape Analysis.
733 return false;
734 }
735 if (t_oop->is_ptr_to_boxed_value()) {
736 ciKlass* boxing_klass = t_oop->klass();
737 if (is_CallStaticJava() && as_CallStaticJava()->is_boxing_method()) {
738 // Skip unrelated boxing methods.
739 Node* proj = proj_out(TypeFunc::Parms);
740 if ((proj == NULL) || (phase->type(proj)->is_instptr()->klass() != boxing_klass)) {
741 return false;
742 }
743 }
744 if (is_CallJava() && as_CallJava()->method() != NULL) {
745 ciMethod* meth = as_CallJava()->method();
746 if (meth->is_accessor()) {
747 return false;
748 }
749 // May modify (by reflection) if an boxing object is passed
750 // as argument or returned.
751 if (returns_pointer() && (proj_out(TypeFunc::Parms) != NULL)) {
752 Node* proj = proj_out(TypeFunc::Parms);
753 const TypeInstPtr* inst_t = phase->type(proj)->isa_instptr();
754 if ((inst_t != NULL) && (!inst_t->klass_is_exact() ||
755 (inst_t->klass() == boxing_klass))) {
756 return true;
757 }
758 }
759 const TypeTuple* d = tf()->domain();
760 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) {
761 const TypeInstPtr* inst_t = d->field_at(i)->isa_instptr();
762 if ((inst_t != NULL) && (!inst_t->klass_is_exact() ||
763 (inst_t->klass() == boxing_klass))) {
764 return true;
765 }
766 }
767 return false;
768 }
769 }
770 return true;
771 }
772
773 // Does this call have a direct reference to n other than debug information?
774 bool CallNode::has_non_debug_use(Node *n) {
775 const TypeTuple * d = tf()->domain();
776 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) {
777 Node *arg = in(i);
778 if (arg == n) {
779 return true;
780 }
781 }
782 return false;
783 }
784
785 // Returns the unique CheckCastPP of a call
786 // or 'this' if there are several CheckCastPP
787 // or returns NULL if there is no one.
788 Node *CallNode::result_cast() {
789 Node *cast = NULL;
790
791 Node *p = proj_out(TypeFunc::Parms);
792 if (p == NULL)
793 return NULL;
794
795 for (DUIterator_Fast imax, i = p->fast_outs(imax); i < imax; i++) {
796 Node *use = p->fast_out(i);
797 if (use->is_CheckCastPP()) {
798 if (cast != NULL) {
799 return this; // more than 1 CheckCastPP
800 }
801 cast = use;
802 }
803 }
804 return cast;
805 }
806
807
808 void CallNode::extract_projections(CallProjections* projs, bool separate_io_proj) {
809 projs->fallthrough_proj = NULL;
810 projs->fallthrough_catchproj = NULL;
811 projs->fallthrough_ioproj = NULL;
812 projs->catchall_ioproj = NULL;
813 projs->catchall_catchproj = NULL;
814 projs->fallthrough_memproj = NULL;
815 projs->catchall_memproj = NULL;
816 projs->resproj = NULL;
817 projs->exobj = NULL;
818
819 for (DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++) {
820 ProjNode *pn = fast_out(i)->as_Proj();
821 if (pn->outcnt() == 0) continue;
822 switch (pn->_con) {
823 case TypeFunc::Control:
824 {
825 // For Control (fallthrough) and I_O (catch_all_index) we have CatchProj -> Catch -> Proj
826 projs->fallthrough_proj = pn;
827 DUIterator_Fast jmax, j = pn->fast_outs(jmax);
828 const Node *cn = pn->fast_out(j);
829 if (cn->is_Catch()) {
830 ProjNode *cpn = NULL;
831 for (DUIterator_Fast kmax, k = cn->fast_outs(kmax); k < kmax; k++) {
832 cpn = cn->fast_out(k)->as_Proj();
833 assert(cpn->is_CatchProj(), "must be a CatchProjNode");
834 if (cpn->_con == CatchProjNode::fall_through_index)
835 projs->fallthrough_catchproj = cpn;
836 else {
837 assert(cpn->_con == CatchProjNode::catch_all_index, "must be correct index.");
838 projs->catchall_catchproj = cpn;
839 }
840 }
841 }
842 break;
843 }
844 case TypeFunc::I_O:
845 if (pn->_is_io_use)
846 projs->catchall_ioproj = pn;
847 else
848 projs->fallthrough_ioproj = pn;
849 for (DUIterator j = pn->outs(); pn->has_out(j); j++) {
850 Node* e = pn->out(j);
851 if (e->Opcode() == Op_CreateEx && e->in(0)->is_CatchProj() && e->outcnt() > 0) {
852 assert(projs->exobj == NULL, "only one");
853 projs->exobj = e;
854 }
855 }
856 break;
857 case TypeFunc::Memory:
858 if (pn->_is_io_use)
859 projs->catchall_memproj = pn;
860 else
861 projs->fallthrough_memproj = pn;
862 break;
863 case TypeFunc::Parms:
864 projs->resproj = pn;
865 break;
866 default:
867 assert(false, "unexpected projection from allocation node.");
868 }
869 }
870
871 // The resproj may not exist because the result couuld be ignored
872 // and the exception object may not exist if an exception handler
873 // swallows the exception but all the other must exist and be found.
874 assert(projs->fallthrough_proj != NULL, "must be found");
875 assert(Compile::current()->inlining_incrementally() || projs->fallthrough_catchproj != NULL, "must be found");
876 assert(Compile::current()->inlining_incrementally() || projs->fallthrough_memproj != NULL, "must be found");
877 assert(Compile::current()->inlining_incrementally() || projs->fallthrough_ioproj != NULL, "must be found");
878 assert(Compile::current()->inlining_incrementally() || projs->catchall_catchproj != NULL, "must be found");
879 if (separate_io_proj) {
880 assert(Compile::current()->inlining_incrementally() || projs->catchall_memproj != NULL, "must be found");
881 assert(Compile::current()->inlining_incrementally() || projs->catchall_ioproj != NULL, "must be found");
882 }
883 }
884
885 Node *CallNode::Ideal(PhaseGVN *phase, bool can_reshape) {
886 CallGenerator* cg = generator();
887 if (can_reshape && cg != NULL && cg->is_mh_late_inline() && !cg->already_attempted()) {
888 // Check whether this MH handle call becomes a candidate for inlining
889 ciMethod* callee = cg->method();
890 vmIntrinsics::ID iid = callee->intrinsic_id();
891 if (iid == vmIntrinsics::_invokeBasic) {
892 if (in(TypeFunc::Parms)->Opcode() == Op_ConP) {
893 phase->C->prepend_late_inline(cg);
894 set_generator(NULL);
895 }
896 } else {
897 assert(callee->has_member_arg(), "wrong type of call?");
898 if (in(TypeFunc::Parms + callee->arg_size() - 1)->Opcode() == Op_ConP) {
899 phase->C->prepend_late_inline(cg);
900 set_generator(NULL);
901 }
902 }
903 }
904 return SafePointNode::Ideal(phase, can_reshape);
905 }
906
907
908 //=============================================================================
909 uint CallJavaNode::size_of() const { return sizeof(*this); }
910 uint CallJavaNode::cmp( const Node &n ) const {
911 CallJavaNode &call = (CallJavaNode&)n;
912 return CallNode::cmp(call) && _method == call._method;
913 }
914 #ifndef PRODUCT
915 void CallJavaNode::dump_spec(outputStream *st) const {
916 if( _method ) _method->print_short_name(st);
917 CallNode::dump_spec(st);
918 }
919 #endif
920
921 //=============================================================================
922 uint CallStaticJavaNode::size_of() const { return sizeof(*this); }
923 uint CallStaticJavaNode::cmp( const Node &n ) const {
924 CallStaticJavaNode &call = (CallStaticJavaNode&)n;
925 return CallJavaNode::cmp(call);
926 }
927
928 //----------------------------uncommon_trap_request----------------------------
929 // If this is an uncommon trap, return the request code, else zero.
930 int CallStaticJavaNode::uncommon_trap_request() const {
931 if (_name != NULL && !strcmp(_name, "uncommon_trap")) {
932 return extract_uncommon_trap_request(this);
933 }
934 return 0;
935 }
936 int CallStaticJavaNode::extract_uncommon_trap_request(const Node* call) {
937 #ifndef PRODUCT
938 if (!(call->req() > TypeFunc::Parms &&
939 call->in(TypeFunc::Parms) != NULL &&
940 call->in(TypeFunc::Parms)->is_Con())) {
941 assert(in_dump() != 0, "OK if dumping");
942 tty->print("[bad uncommon trap]");
943 return 0;
944 }
945 #endif
946 return call->in(TypeFunc::Parms)->bottom_type()->is_int()->get_con();
947 }
948
949 #ifndef PRODUCT
950 void CallStaticJavaNode::dump_spec(outputStream *st) const {
951 st->print("# Static ");
952 if (_name != NULL) {
953 st->print("%s", _name);
954 int trap_req = uncommon_trap_request();
955 if (trap_req != 0) {
956 char buf[100];
957 st->print("(%s)",
958 Deoptimization::format_trap_request(buf, sizeof(buf),
959 trap_req));
960 }
961 st->print(" ");
962 }
963 CallJavaNode::dump_spec(st);
964 }
965 #endif
966
967 //=============================================================================
968 uint CallDynamicJavaNode::size_of() const { return sizeof(*this); }
969 uint CallDynamicJavaNode::cmp( const Node &n ) const {
970 CallDynamicJavaNode &call = (CallDynamicJavaNode&)n;
971 return CallJavaNode::cmp(call);
972 }
973 #ifndef PRODUCT
974 void CallDynamicJavaNode::dump_spec(outputStream *st) const {
975 st->print("# Dynamic ");
976 CallJavaNode::dump_spec(st);
977 }
978 #endif
979
980 //=============================================================================
981 uint CallRuntimeNode::size_of() const { return sizeof(*this); }
982 uint CallRuntimeNode::cmp( const Node &n ) const {
983 CallRuntimeNode &call = (CallRuntimeNode&)n;
984 return CallNode::cmp(call) && !strcmp(_name,call._name);
985 }
986 #ifndef PRODUCT
987 void CallRuntimeNode::dump_spec(outputStream *st) const {
988 st->print("# ");
989 st->print(_name);
990 CallNode::dump_spec(st);
991 }
992 #endif
993
994 //------------------------------calling_convention-----------------------------
995 void CallRuntimeNode::calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const {
996 Matcher::c_calling_convention( sig_bt, parm_regs, argcnt );
997 }
998
999 //=============================================================================
1000 //------------------------------calling_convention-----------------------------
1001
1002
1003 //=============================================================================
1004 #ifndef PRODUCT
1005 void CallLeafNode::dump_spec(outputStream *st) const {
1006 st->print("# ");
1007 st->print(_name);
1008 CallNode::dump_spec(st);
1009 }
1010 #endif
1011
1012 //=============================================================================
1013
1014 void SafePointNode::set_local(JVMState* jvms, uint idx, Node *c) {
1015 assert(verify_jvms(jvms), "jvms must match");
1016 int loc = jvms->locoff() + idx;
1017 if (in(loc)->is_top() && idx > 0 && !c->is_top() ) {
1018 // If current local idx is top then local idx - 1 could
1019 // be a long/double that needs to be killed since top could
1020 // represent the 2nd half ofthe long/double.
1021 uint ideal = in(loc -1)->ideal_reg();
1022 if (ideal == Op_RegD || ideal == Op_RegL) {
1023 // set other (low index) half to top
1024 set_req(loc - 1, in(loc));
1025 }
1026 }
1027 set_req(loc, c);
1028 }
1029
1030 uint SafePointNode::size_of() const { return sizeof(*this); }
1031 uint SafePointNode::cmp( const Node &n ) const {
1032 return (&n == this); // Always fail except on self
1033 }
1034
1035 //-------------------------set_next_exception----------------------------------
1036 void SafePointNode::set_next_exception(SafePointNode* n) {
1037 assert(n == NULL || n->Opcode() == Op_SafePoint, "correct value for next_exception");
1038 if (len() == req()) {
1039 if (n != NULL) add_prec(n);
1040 } else {
1041 set_prec(req(), n);
1042 }
1043 }
1044
1045
1046 //----------------------------next_exception-----------------------------------
1047 SafePointNode* SafePointNode::next_exception() const {
1048 if (len() == req()) {
1049 return NULL;
1050 } else {
1051 Node* n = in(req());
1052 assert(n == NULL || n->Opcode() == Op_SafePoint, "no other uses of prec edges");
1053 return (SafePointNode*) n;
1054 }
1055 }
1056
1057
1058 //------------------------------Ideal------------------------------------------
1059 // Skip over any collapsed Regions
1060 Node *SafePointNode::Ideal(PhaseGVN *phase, bool can_reshape) {
1061 return remove_dead_region(phase, can_reshape) ? this : NULL;
1062 }
1063
1064 //------------------------------Identity---------------------------------------
1065 // Remove obviously duplicate safepoints
1066 Node *SafePointNode::Identity( PhaseTransform *phase ) {
1067
1068 // If you have back to back safepoints, remove one
1069 if( in(TypeFunc::Control)->is_SafePoint() )
1070 return in(TypeFunc::Control);
1071
1072 if( in(0)->is_Proj() ) {
1073 Node *n0 = in(0)->in(0);
1074 // Check if he is a call projection (except Leaf Call)
1075 if( n0->is_Catch() ) {
1076 n0 = n0->in(0)->in(0);
1077 assert( n0->is_Call(), "expect a call here" );
1078 }
1079 if( n0->is_Call() && n0->as_Call()->guaranteed_safepoint() ) {
1080 // Useless Safepoint, so remove it
1081 return in(TypeFunc::Control);
1082 }
1083 }
1084
1085 return this;
1086 }
1087
1088 //------------------------------Value------------------------------------------
1089 const Type *SafePointNode::Value( PhaseTransform *phase ) const {
1090 if( phase->type(in(0)) == Type::TOP ) return Type::TOP;
1091 if( phase->eqv( in(0), this ) ) return Type::TOP; // Dead infinite loop
1092 return Type::CONTROL;
1093 }
1094
1095 #ifndef PRODUCT
1096 void SafePointNode::dump_spec(outputStream *st) const {
1097 st->print(" SafePoint ");
1098 }
1099 #endif
1100
1101 const RegMask &SafePointNode::in_RegMask(uint idx) const {
1102 if( idx < TypeFunc::Parms ) return RegMask::Empty;
1103 // Values outside the domain represent debug info
1104 return *(Compile::current()->matcher()->idealreg2debugmask[in(idx)->ideal_reg()]);
1105 }
1106 const RegMask &SafePointNode::out_RegMask() const {
1107 return RegMask::Empty;
1108 }
1109
1110
1111 void SafePointNode::grow_stack(JVMState* jvms, uint grow_by) {
1112 assert((int)grow_by > 0, "sanity");
1113 int monoff = jvms->monoff();
1114 int scloff = jvms->scloff();
1115 int endoff = jvms->endoff();
1116 assert(endoff == (int)req(), "no other states or debug info after me");
1117 Node* top = Compile::current()->top();
1118 for (uint i = 0; i < grow_by; i++) {
1119 ins_req(monoff, top);
1120 }
1121 jvms->set_monoff(monoff + grow_by);
1122 jvms->set_scloff(scloff + grow_by);
1123 jvms->set_endoff(endoff + grow_by);
1124 }
1125
1126 void SafePointNode::push_monitor(const FastLockNode *lock) {
1127 // Add a LockNode, which points to both the original BoxLockNode (the
1128 // stack space for the monitor) and the Object being locked.
1129 const int MonitorEdges = 2;
1130 assert(JVMState::logMonitorEdges == exact_log2(MonitorEdges), "correct MonitorEdges");
1131 assert(req() == jvms()->endoff(), "correct sizing");
1132 int nextmon = jvms()->scloff();
1133 if (GenerateSynchronizationCode) {
1134 ins_req(nextmon, lock->box_node());
1135 ins_req(nextmon+1, lock->obj_node());
1136 } else {
1137 Node* top = Compile::current()->top();
1138 ins_req(nextmon, top);
1139 ins_req(nextmon, top);
1140 }
1141 jvms()->set_scloff(nextmon + MonitorEdges);
1142 jvms()->set_endoff(req());
1143 }
1144
1145 void SafePointNode::pop_monitor() {
1146 // Delete last monitor from debug info
1147 debug_only(int num_before_pop = jvms()->nof_monitors());
1148 const int MonitorEdges = 2;
1149 assert(JVMState::logMonitorEdges == exact_log2(MonitorEdges), "correct MonitorEdges");
1150 int scloff = jvms()->scloff();
1151 int endoff = jvms()->endoff();
1152 int new_scloff = scloff - MonitorEdges;
1153 int new_endoff = endoff - MonitorEdges;
1154 jvms()->set_scloff(new_scloff);
1155 jvms()->set_endoff(new_endoff);
1156 while (scloff > new_scloff) del_req_ordered(--scloff);
1157 assert(jvms()->nof_monitors() == num_before_pop-1, "");
1158 }
1159
1160 Node *SafePointNode::peek_monitor_box() const {
1161 int mon = jvms()->nof_monitors() - 1;
1162 assert(mon >= 0, "most have a monitor");
1163 return monitor_box(jvms(), mon);
1164 }
1165
1166 Node *SafePointNode::peek_monitor_obj() const {
1167 int mon = jvms()->nof_monitors() - 1;
1168 assert(mon >= 0, "most have a monitor");
1169 return monitor_obj(jvms(), mon);
1170 }
1171
1172 // Do we Match on this edge index or not? Match no edges
1173 uint SafePointNode::match_edge(uint idx) const {
1174 if( !needs_polling_address_input() )
1175 return 0;
1176
1177 return (TypeFunc::Parms == idx);
1178 }
1179
1180 //============== SafePointScalarObjectNode ==============
1181
1182 SafePointScalarObjectNode::SafePointScalarObjectNode(const TypeOopPtr* tp,
1183 #ifdef ASSERT
1184 AllocateNode* alloc,
1185 #endif
1186 uint first_index,
1187 uint n_fields) :
1188 TypeNode(tp, 1), // 1 control input -- seems required. Get from root.
1189 #ifdef ASSERT
1190 _alloc(alloc),
1191 #endif
1192 _first_index(first_index),
1193 _n_fields(n_fields)
1194 {
1195 init_class_id(Class_SafePointScalarObject);
1196 }
1197
1198 // Do not allow value-numbering for SafePointScalarObject node.
1199 uint SafePointScalarObjectNode::hash() const { return NO_HASH; }
1200 uint SafePointScalarObjectNode::cmp( const Node &n ) const {
1201 return (&n == this); // Always fail except on self
1202 }
1203
1204 uint SafePointScalarObjectNode::ideal_reg() const {
1205 return 0; // No matching to machine instruction
1206 }
1207
1208 const RegMask &SafePointScalarObjectNode::in_RegMask(uint idx) const {
1209 return *(Compile::current()->matcher()->idealreg2debugmask[in(idx)->ideal_reg()]);
1210 }
1211
1212 const RegMask &SafePointScalarObjectNode::out_RegMask() const {
1213 return RegMask::Empty;
1214 }
1215
1216 uint SafePointScalarObjectNode::match_edge(uint idx) const {
1217 return 0;
1218 }
1219
1220 SafePointScalarObjectNode*
1221 SafePointScalarObjectNode::clone(Dict* sosn_map) const {
1222 void* cached = (*sosn_map)[(void*)this];
1223 if (cached != NULL) {
1224 return (SafePointScalarObjectNode*)cached;
1225 }
1226 SafePointScalarObjectNode* res = (SafePointScalarObjectNode*)Node::clone();
1227 sosn_map->Insert((void*)this, (void*)res);
1228 return res;
1229 }
1230
1231
1232 #ifndef PRODUCT
1233 void SafePointScalarObjectNode::dump_spec(outputStream *st) const {
1234 st->print(" # fields@[%d..%d]", first_index(),
1235 first_index() + n_fields() - 1);
1236 }
1237
1238 #endif
1239
1240 //=============================================================================
1241 uint AllocateNode::size_of() const { return sizeof(*this); }
1242
1243 AllocateNode::AllocateNode(Compile* C, const TypeFunc *atype,
1244 Node *ctrl, Node *mem, Node *abio,
1245 Node *size, Node *klass_node, Node *initial_test)
1246 : CallNode(atype, NULL, TypeRawPtr::BOTTOM)
1247 {
1248 init_class_id(Class_Allocate);
1249 init_flags(Flag_is_macro);
1250 _is_scalar_replaceable = false;
1251 _is_non_escaping = false;
1252 Node *topnode = C->top();
1253
1254 init_req( TypeFunc::Control , ctrl );
1255 init_req( TypeFunc::I_O , abio );
1256 init_req( TypeFunc::Memory , mem );
1257 init_req( TypeFunc::ReturnAdr, topnode );
1258 init_req( TypeFunc::FramePtr , topnode );
1259 init_req( AllocSize , size);
1260 init_req( KlassNode , klass_node);
1261 init_req( InitialTest , initial_test);
1262 init_req( ALength , topnode);
1263 C->add_macro_node(this);
1264 }
1265
1266 //=============================================================================
1267 Node* AllocateArrayNode::Ideal(PhaseGVN *phase, bool can_reshape) {
1268 if (remove_dead_region(phase, can_reshape)) return this;
1269 // Don't bother trying to transform a dead node
1270 if (in(0) && in(0)->is_top()) return NULL;
1271
1272 const Type* type = phase->type(Ideal_length());
1273 if (type->isa_int() && type->is_int()->_hi < 0) {
1274 if (can_reshape) {
1275 PhaseIterGVN *igvn = phase->is_IterGVN();
1276 // Unreachable fall through path (negative array length),
1277 // the allocation can only throw so disconnect it.
1278 Node* proj = proj_out(TypeFunc::Control);
1279 Node* catchproj = NULL;
1280 if (proj != NULL) {
1281 for (DUIterator_Fast imax, i = proj->fast_outs(imax); i < imax; i++) {
1282 Node *cn = proj->fast_out(i);
1283 if (cn->is_Catch()) {
1284 catchproj = cn->as_Multi()->proj_out(CatchProjNode::fall_through_index);
1285 break;
1286 }
1287 }
1288 }
1289 if (catchproj != NULL && catchproj->outcnt() > 0 &&
1290 (catchproj->outcnt() > 1 ||
1291 catchproj->unique_out()->Opcode() != Op_Halt)) {
1292 assert(catchproj->is_CatchProj(), "must be a CatchProjNode");
1293 Node* nproj = catchproj->clone();
1294 igvn->register_new_node_with_optimizer(nproj);
1295
1296 Node *frame = new (phase->C) ParmNode( phase->C->start(), TypeFunc::FramePtr );
1297 frame = phase->transform(frame);
1298 // Halt & Catch Fire
1299 Node *halt = new (phase->C) HaltNode( nproj, frame );
1300 phase->C->root()->add_req(halt);
1301 phase->transform(halt);
1302
1303 igvn->replace_node(catchproj, phase->C->top());
1304 return this;
1305 }
1306 } else {
1307 // Can't correct it during regular GVN so register for IGVN
1308 phase->C->record_for_igvn(this);
1309 }
1310 }
1311 return NULL;
1312 }
1313
1314 // Retrieve the length from the AllocateArrayNode. Narrow the type with a
1315 // CastII, if appropriate. If we are not allowed to create new nodes, and
1316 // a CastII is appropriate, return NULL.
1317 Node *AllocateArrayNode::make_ideal_length(const TypeOopPtr* oop_type, PhaseTransform *phase, bool allow_new_nodes) {
1318 Node *length = in(AllocateNode::ALength);
1319 assert(length != NULL, "length is not null");
1320
1321 const TypeInt* length_type = phase->find_int_type(length);
1322 const TypeAryPtr* ary_type = oop_type->isa_aryptr();
1323
1324 if (ary_type != NULL && length_type != NULL) {
1325 const TypeInt* narrow_length_type = ary_type->narrow_size_type(length_type);
1326 if (narrow_length_type != length_type) {
1327 // Assert one of:
1328 // - the narrow_length is 0
1329 // - the narrow_length is not wider than length
1330 assert(narrow_length_type == TypeInt::ZERO ||
1331 length_type->is_con() && narrow_length_type->is_con() &&
1332 (narrow_length_type->_hi <= length_type->_lo) ||
1333 (narrow_length_type->_hi <= length_type->_hi &&
1334 narrow_length_type->_lo >= length_type->_lo),
1335 "narrow type must be narrower than length type");
1336
1337 // Return NULL if new nodes are not allowed
1338 if (!allow_new_nodes) return NULL;
1339 // Create a cast which is control dependent on the initialization to
1340 // propagate the fact that the array length must be positive.
1341 length = new (phase->C) CastIINode(length, narrow_length_type);
1342 length->set_req(0, initialization()->proj_out(0));
1343 }
1344 }
1345
1346 return length;
1347 }
1348
1349 //=============================================================================
1350 uint LockNode::size_of() const { return sizeof(*this); }
1351
1352 // Redundant lock elimination
1353 //
1354 // There are various patterns of locking where we release and
1355 // immediately reacquire a lock in a piece of code where no operations
1356 // occur in between that would be observable. In those cases we can
1357 // skip releasing and reacquiring the lock without violating any
1358 // fairness requirements. Doing this around a loop could cause a lock
1359 // to be held for a very long time so we concentrate on non-looping
1360 // control flow. We also require that the operations are fully
1361 // redundant meaning that we don't introduce new lock operations on
1362 // some paths so to be able to eliminate it on others ala PRE. This
1363 // would probably require some more extensive graph manipulation to
1364 // guarantee that the memory edges were all handled correctly.
1365 //
1366 // Assuming p is a simple predicate which can't trap in any way and s
1367 // is a synchronized method consider this code:
1368 //
1369 // s();
1370 // if (p)
1371 // s();
1372 // else
1373 // s();
1374 // s();
1375 //
1376 // 1. The unlocks of the first call to s can be eliminated if the
1377 // locks inside the then and else branches are eliminated.
1378 //
1379 // 2. The unlocks of the then and else branches can be eliminated if
1380 // the lock of the final call to s is eliminated.
1381 //
1382 // Either of these cases subsumes the simple case of sequential control flow
1383 //
1384 // Addtionally we can eliminate versions without the else case:
1385 //
1386 // s();
1387 // if (p)
1388 // s();
1389 // s();
1390 //
1391 // 3. In this case we eliminate the unlock of the first s, the lock
1392 // and unlock in the then case and the lock in the final s.
1393 //
1394 // Note also that in all these cases the then/else pieces don't have
1395 // to be trivial as long as they begin and end with synchronization
1396 // operations.
1397 //
1398 // s();
1399 // if (p)
1400 // s();
1401 // f();
1402 // s();
1403 // s();
1404 //
1405 // The code will work properly for this case, leaving in the unlock
1406 // before the call to f and the relock after it.
1407 //
1408 // A potentially interesting case which isn't handled here is when the
1409 // locking is partially redundant.
1410 //
1411 // s();
1412 // if (p)
1413 // s();
1414 //
1415 // This could be eliminated putting unlocking on the else case and
1416 // eliminating the first unlock and the lock in the then side.
1417 // Alternatively the unlock could be moved out of the then side so it
1418 // was after the merge and the first unlock and second lock
1419 // eliminated. This might require less manipulation of the memory
1420 // state to get correct.
1421 //
1422 // Additionally we might allow work between a unlock and lock before
1423 // giving up eliminating the locks. The current code disallows any
1424 // conditional control flow between these operations. A formulation
1425 // similar to partial redundancy elimination computing the
1426 // availability of unlocking and the anticipatability of locking at a
1427 // program point would allow detection of fully redundant locking with
1428 // some amount of work in between. I'm not sure how often I really
1429 // think that would occur though. Most of the cases I've seen
1430 // indicate it's likely non-trivial work would occur in between.
1431 // There may be other more complicated constructs where we could
1432 // eliminate locking but I haven't seen any others appear as hot or
1433 // interesting.
1434 //
1435 // Locking and unlocking have a canonical form in ideal that looks
1436 // roughly like this:
1437 //
1438 // <obj>
1439 // | \\------+
1440 // | \ \
1441 // | BoxLock \
1442 // | | | \
1443 // | | \ \
1444 // | | FastLock
1445 // | | /
1446 // | | /
1447 // | | |
1448 //
1449 // Lock
1450 // |
1451 // Proj #0
1452 // |
1453 // MembarAcquire
1454 // |
1455 // Proj #0
1456 //
1457 // MembarRelease
1458 // |
1459 // Proj #0
1460 // |
1461 // Unlock
1462 // |
1463 // Proj #0
1464 //
1465 //
1466 // This code proceeds by processing Lock nodes during PhaseIterGVN
1467 // and searching back through its control for the proper code
1468 // patterns. Once it finds a set of lock and unlock operations to
1469 // eliminate they are marked as eliminatable which causes the
1470 // expansion of the Lock and Unlock macro nodes to make the operation a NOP
1471 //
1472 //=============================================================================
1473
1474 //
1475 // Utility function to skip over uninteresting control nodes. Nodes skipped are:
1476 // - copy regions. (These may not have been optimized away yet.)
1477 // - eliminated locking nodes
1478 //
1479 static Node *next_control(Node *ctrl) {
1480 if (ctrl == NULL)
1481 return NULL;
1482 while (1) {
1483 if (ctrl->is_Region()) {
1484 RegionNode *r = ctrl->as_Region();
1485 Node *n = r->is_copy();
1486 if (n == NULL)
1487 break; // hit a region, return it
1488 else
1489 ctrl = n;
1490 } else if (ctrl->is_Proj()) {
1491 Node *in0 = ctrl->in(0);
1492 if (in0->is_AbstractLock() && in0->as_AbstractLock()->is_eliminated()) {
1493 ctrl = in0->in(0);
1494 } else {
1495 break;
1496 }
1497 } else {
1498 break; // found an interesting control
1499 }
1500 }
1501 return ctrl;
1502 }
1503 //
1504 // Given a control, see if it's the control projection of an Unlock which
1505 // operating on the same object as lock.
1506 //
1507 bool AbstractLockNode::find_matching_unlock(const Node* ctrl, LockNode* lock,
1508 GrowableArray<AbstractLockNode*> &lock_ops) {
1509 ProjNode *ctrl_proj = (ctrl->is_Proj()) ? ctrl->as_Proj() : NULL;
1510 if (ctrl_proj != NULL && ctrl_proj->_con == TypeFunc::Control) {
1511 Node *n = ctrl_proj->in(0);
1512 if (n != NULL && n->is_Unlock()) {
1513 UnlockNode *unlock = n->as_Unlock();
1514 if (lock->obj_node()->eqv_uncast(unlock->obj_node()) &&
1515 BoxLockNode::same_slot(lock->box_node(), unlock->box_node()) &&
1516 !unlock->is_eliminated()) {
1517 lock_ops.append(unlock);
1518 return true;
1519 }
1520 }
1521 }
1522 return false;
1523 }
1524
1525 //
1526 // Find the lock matching an unlock. Returns null if a safepoint
1527 // or complicated control is encountered first.
1528 LockNode *AbstractLockNode::find_matching_lock(UnlockNode* unlock) {
1529 LockNode *lock_result = NULL;
1530 // find the matching lock, or an intervening safepoint
1531 Node *ctrl = next_control(unlock->in(0));
1532 while (1) {
1533 assert(ctrl != NULL, "invalid control graph");
1534 assert(!ctrl->is_Start(), "missing lock for unlock");
1535 if (ctrl->is_top()) break; // dead control path
1536 if (ctrl->is_Proj()) ctrl = ctrl->in(0);
1537 if (ctrl->is_SafePoint()) {
1538 break; // found a safepoint (may be the lock we are searching for)
1539 } else if (ctrl->is_Region()) {
1540 // Check for a simple diamond pattern. Punt on anything more complicated
1541 if (ctrl->req() == 3 && ctrl->in(1) != NULL && ctrl->in(2) != NULL) {
1542 Node *in1 = next_control(ctrl->in(1));
1543 Node *in2 = next_control(ctrl->in(2));
1544 if (((in1->is_IfTrue() && in2->is_IfFalse()) ||
1545 (in2->is_IfTrue() && in1->is_IfFalse())) && (in1->in(0) == in2->in(0))) {
1546 ctrl = next_control(in1->in(0)->in(0));
1547 } else {
1548 break;
1549 }
1550 } else {
1551 break;
1552 }
1553 } else {
1554 ctrl = next_control(ctrl->in(0)); // keep searching
1555 }
1556 }
1557 if (ctrl->is_Lock()) {
1558 LockNode *lock = ctrl->as_Lock();
1559 if (lock->obj_node()->eqv_uncast(unlock->obj_node()) &&
1560 BoxLockNode::same_slot(lock->box_node(), unlock->box_node())) {
1561 lock_result = lock;
1562 }
1563 }
1564 return lock_result;
1565 }
1566
1567 // This code corresponds to case 3 above.
1568
1569 bool AbstractLockNode::find_lock_and_unlock_through_if(Node* node, LockNode* lock,
1570 GrowableArray<AbstractLockNode*> &lock_ops) {
1571 Node* if_node = node->in(0);
1572 bool if_true = node->is_IfTrue();
1573
1574 if (if_node->is_If() && if_node->outcnt() == 2 && (if_true || node->is_IfFalse())) {
1575 Node *lock_ctrl = next_control(if_node->in(0));
1576 if (find_matching_unlock(lock_ctrl, lock, lock_ops)) {
1577 Node* lock1_node = NULL;
1578 ProjNode* proj = if_node->as_If()->proj_out(!if_true);
1579 if (if_true) {
1580 if (proj->is_IfFalse() && proj->outcnt() == 1) {
1581 lock1_node = proj->unique_out();
1582 }
1583 } else {
1584 if (proj->is_IfTrue() && proj->outcnt() == 1) {
1585 lock1_node = proj->unique_out();
1586 }
1587 }
1588 if (lock1_node != NULL && lock1_node->is_Lock()) {
1589 LockNode *lock1 = lock1_node->as_Lock();
1590 if (lock->obj_node()->eqv_uncast(lock1->obj_node()) &&
1591 BoxLockNode::same_slot(lock->box_node(), lock1->box_node()) &&
1592 !lock1->is_eliminated()) {
1593 lock_ops.append(lock1);
1594 return true;
1595 }
1596 }
1597 }
1598 }
1599
1600 lock_ops.trunc_to(0);
1601 return false;
1602 }
1603
1604 bool AbstractLockNode::find_unlocks_for_region(const RegionNode* region, LockNode* lock,
1605 GrowableArray<AbstractLockNode*> &lock_ops) {
1606 // check each control merging at this point for a matching unlock.
1607 // in(0) should be self edge so skip it.
1608 for (int i = 1; i < (int)region->req(); i++) {
1609 Node *in_node = next_control(region->in(i));
1610 if (in_node != NULL) {
1611 if (find_matching_unlock(in_node, lock, lock_ops)) {
1612 // found a match so keep on checking.
1613 continue;
1614 } else if (find_lock_and_unlock_through_if(in_node, lock, lock_ops)) {
1615 continue;
1616 }
1617
1618 // If we fall through to here then it was some kind of node we
1619 // don't understand or there wasn't a matching unlock, so give
1620 // up trying to merge locks.
1621 lock_ops.trunc_to(0);
1622 return false;
1623 }
1624 }
1625 return true;
1626
1627 }
1628
1629 #ifndef PRODUCT
1630 //
1631 // Create a counter which counts the number of times this lock is acquired
1632 //
1633 void AbstractLockNode::create_lock_counter(JVMState* state) {
1634 _counter = OptoRuntime::new_named_counter(state, NamedCounter::LockCounter);
1635 }
1636
1637 void AbstractLockNode::set_eliminated_lock_counter() {
1638 if (_counter) {
1639 // Update the counter to indicate that this lock was eliminated.
1640 // The counter update code will stay around even though the
1641 // optimizer will eliminate the lock operation itself.
1642 _counter->set_tag(NamedCounter::EliminatedLockCounter);
1643 }
1644 }
1645 #endif
1646
1647 //=============================================================================
1648 Node *LockNode::Ideal(PhaseGVN *phase, bool can_reshape) {
1649
1650 // perform any generic optimizations first (returns 'this' or NULL)
1651 Node *result = SafePointNode::Ideal(phase, can_reshape);
1652 if (result != NULL) return result;
1653 // Don't bother trying to transform a dead node
1654 if (in(0) && in(0)->is_top()) return NULL;
1655
1656 // Now see if we can optimize away this lock. We don't actually
1657 // remove the locking here, we simply set the _eliminate flag which
1658 // prevents macro expansion from expanding the lock. Since we don't
1659 // modify the graph, the value returned from this function is the
1660 // one computed above.
1661 if (can_reshape && EliminateLocks && !is_non_esc_obj()) {
1662 //
1663 // If we are locking an unescaped object, the lock/unlock is unnecessary
1664 //
1665 ConnectionGraph *cgr = phase->C->congraph();
1666 if (cgr != NULL && cgr->not_global_escape(obj_node())) {
1667 assert(!is_eliminated() || is_coarsened(), "sanity");
1668 // The lock could be marked eliminated by lock coarsening
1669 // code during first IGVN before EA. Replace coarsened flag
1670 // to eliminate all associated locks/unlocks.
1671 this->set_non_esc_obj();
1672 return result;
1673 }
1674
1675 //
1676 // Try lock coarsening
1677 //
1678 PhaseIterGVN* iter = phase->is_IterGVN();
1679 if (iter != NULL && !is_eliminated()) {
1680
1681 GrowableArray<AbstractLockNode*> lock_ops;
1682
1683 Node *ctrl = next_control(in(0));
1684
1685 // now search back for a matching Unlock
1686 if (find_matching_unlock(ctrl, this, lock_ops)) {
1687 // found an unlock directly preceding this lock. This is the
1688 // case of single unlock directly control dependent on a
1689 // single lock which is the trivial version of case 1 or 2.
1690 } else if (ctrl->is_Region() ) {
1691 if (find_unlocks_for_region(ctrl->as_Region(), this, lock_ops)) {
1692 // found lock preceded by multiple unlocks along all paths
1693 // joining at this point which is case 3 in description above.
1694 }
1695 } else {
1696 // see if this lock comes from either half of an if and the
1697 // predecessors merges unlocks and the other half of the if
1698 // performs a lock.
1699 if (find_lock_and_unlock_through_if(ctrl, this, lock_ops)) {
1700 // found unlock splitting to an if with locks on both branches.
1701 }
1702 }
1703
1704 if (lock_ops.length() > 0) {
1705 // add ourselves to the list of locks to be eliminated.
1706 lock_ops.append(this);
1707
1708 #ifndef PRODUCT
1709 if (PrintEliminateLocks) {
1710 int locks = 0;
1711 int unlocks = 0;
1712 for (int i = 0; i < lock_ops.length(); i++) {
1713 AbstractLockNode* lock = lock_ops.at(i);
1714 if (lock->Opcode() == Op_Lock)
1715 locks++;
1716 else
1717 unlocks++;
1718 if (Verbose) {
1719 lock->dump(1);
1720 }
1721 }
1722 tty->print_cr("***Eliminated %d unlocks and %d locks", unlocks, locks);
1723 }
1724 #endif
1725
1726 // for each of the identified locks, mark them
1727 // as eliminatable
1728 for (int i = 0; i < lock_ops.length(); i++) {
1729 AbstractLockNode* lock = lock_ops.at(i);
1730
1731 // Mark it eliminated by coarsening and update any counters
1732 lock->set_coarsened();
1733 }
1734 } else if (ctrl->is_Region() &&
1735 iter->_worklist.member(ctrl)) {
1736 // We weren't able to find any opportunities but the region this
1737 // lock is control dependent on hasn't been processed yet so put
1738 // this lock back on the worklist so we can check again once any
1739 // region simplification has occurred.
1740 iter->_worklist.push(this);
1741 }
1742 }
1743 }
1744
1745 return result;
1746 }
1747
1748 //=============================================================================
1749 bool LockNode::is_nested_lock_region() {
1750 BoxLockNode* box = box_node()->as_BoxLock();
1751 int stk_slot = box->stack_slot();
1752 if (stk_slot <= 0)
1753 return false; // External lock or it is not Box (Phi node).
1754
1755 // Ignore complex cases: merged locks or multiple locks.
1756 Node* obj = obj_node();
1757 LockNode* unique_lock = NULL;
1758 if (!box->is_simple_lock_region(&unique_lock, obj) ||
1759 (unique_lock != this)) {
1760 return false;
1761 }
1762
1763 // Look for external lock for the same object.
1764 SafePointNode* sfn = this->as_SafePoint();
1765 JVMState* youngest_jvms = sfn->jvms();
1766 int max_depth = youngest_jvms->depth();
1767 for (int depth = 1; depth <= max_depth; depth++) {
1768 JVMState* jvms = youngest_jvms->of_depth(depth);
1769 int num_mon = jvms->nof_monitors();
1770 // Loop over monitors
1771 for (int idx = 0; idx < num_mon; idx++) {
1772 Node* obj_node = sfn->monitor_obj(jvms, idx);
1773 BoxLockNode* box_node = sfn->monitor_box(jvms, idx)->as_BoxLock();
1774 if ((box_node->stack_slot() < stk_slot) && obj_node->eqv_uncast(obj)) {
1775 return true;
1776 }
1777 }
1778 }
1779 return false;
1780 }
1781
1782 //=============================================================================
1783 uint UnlockNode::size_of() const { return sizeof(*this); }
1784
1785 //=============================================================================
1786 Node *UnlockNode::Ideal(PhaseGVN *phase, bool can_reshape) {
1787
1788 // perform any generic optimizations first (returns 'this' or NULL)
1789 Node *result = SafePointNode::Ideal(phase, can_reshape);
1790 if (result != NULL) return result;
1791 // Don't bother trying to transform a dead node
1792 if (in(0) && in(0)->is_top()) return NULL;
1793
1794 // Now see if we can optimize away this unlock. We don't actually
1795 // remove the unlocking here, we simply set the _eliminate flag which
1796 // prevents macro expansion from expanding the unlock. Since we don't
1797 // modify the graph, the value returned from this function is the
1798 // one computed above.
1799 // Escape state is defined after Parse phase.
1800 if (can_reshape && EliminateLocks && !is_non_esc_obj()) {
1801 //
1802 // If we are unlocking an unescaped object, the lock/unlock is unnecessary.
1803 //
1804 ConnectionGraph *cgr = phase->C->congraph();
1805 if (cgr != NULL && cgr->not_global_escape(obj_node())) {
1806 assert(!is_eliminated() || is_coarsened(), "sanity");
1807 // The lock could be marked eliminated by lock coarsening
1808 // code during first IGVN before EA. Replace coarsened flag
1809 // to eliminate all associated locks/unlocks.
1810 this->set_non_esc_obj();
1811 }
1812 }
1813 return result;
1814 }