1 /*
2 * Copyright (c) 1997, 2015, 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 "compiler/compileLog.hpp"
27 #include "ci/bcEscapeAnalyzer.hpp"
28 #include "compiler/oopMap.hpp"
29 #include "opto/callGenerator.hpp"
30 #include "opto/callnode.hpp"
31 #include "opto/castnode.hpp"
32 #include "opto/convertnode.hpp"
33 #include "opto/escape.hpp"
34 #include "opto/locknode.hpp"
35 #include "opto/machnode.hpp"
36 #include "opto/matcher.hpp"
37 #include "opto/parse.hpp"
38 #include "opto/regalloc.hpp"
39 #include "opto/regmask.hpp"
40 #include "opto/rootnode.hpp"
41 #include "opto/runtime.hpp"
42
43 // Portions of code courtesy of Clifford Click
44
45 // Optimization - Graph Style
46
47 //=============================================================================
48 uint StartNode::size_of() const { return sizeof(*this); }
49 uint StartNode::cmp( const Node &n ) const
50 { return _domain == ((StartNode&)n)._domain; }
51 const Type *StartNode::bottom_type() const { return _domain; }
52 const Type *StartNode::Value(PhaseTransform *phase) const { return _domain; }
53 #ifndef PRODUCT
54 void StartNode::dump_spec(outputStream *st) const { st->print(" #"); _domain->dump_on(st);}
55 void StartNode::dump_compact_spec(outputStream *st) const { /* empty */ }
56 #endif
57
58 //------------------------------Ideal------------------------------------------
59 Node *StartNode::Ideal(PhaseGVN *phase, bool can_reshape){
60 return remove_dead_region(phase, can_reshape) ? this : NULL;
61 }
62
63 //------------------------------calling_convention-----------------------------
64 void StartNode::calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const {
65 Matcher::calling_convention( sig_bt, parm_regs, argcnt, false );
66 }
67
68 //------------------------------Registers--------------------------------------
69 const RegMask &StartNode::in_RegMask(uint) const {
70 return RegMask::Empty;
71 }
72
73 //------------------------------match------------------------------------------
74 // Construct projections for incoming parameters, and their RegMask info
75 Node *StartNode::match( const ProjNode *proj, const Matcher *match ) {
76 switch (proj->_con) {
77 case TypeFunc::Control:
78 case TypeFunc::I_O:
79 case TypeFunc::Memory:
80 return new MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj);
81 case TypeFunc::FramePtr:
82 return new MachProjNode(this,proj->_con,Matcher::c_frame_ptr_mask, Op_RegP);
83 case TypeFunc::ReturnAdr:
84 return new MachProjNode(this,proj->_con,match->_return_addr_mask,Op_RegP);
85 case TypeFunc::Parms:
86 default: {
87 uint parm_num = proj->_con - TypeFunc::Parms;
88 const Type *t = _domain->field_at(proj->_con);
89 if (t->base() == Type::Half) // 2nd half of Longs and Doubles
90 return new ConNode(Type::TOP);
91 uint ideal_reg = t->ideal_reg();
92 RegMask &rm = match->_calling_convention_mask[parm_num];
93 return new MachProjNode(this,proj->_con,rm,ideal_reg);
94 }
95 }
96 return NULL;
97 }
98
99 //------------------------------StartOSRNode----------------------------------
100 // The method start node for an on stack replacement adapter
101
102 //------------------------------osr_domain-----------------------------
103 const TypeTuple *StartOSRNode::osr_domain() {
104 const Type **fields = TypeTuple::fields(2);
105 fields[TypeFunc::Parms+0] = TypeRawPtr::BOTTOM; // address of osr buffer
106
107 return TypeTuple::make(TypeFunc::Parms+1, fields);
108 }
109
110 //=============================================================================
111 const char * const ParmNode::names[TypeFunc::Parms+1] = {
112 "Control", "I_O", "Memory", "FramePtr", "ReturnAdr", "Parms"
113 };
114
115 #ifndef PRODUCT
116 void ParmNode::dump_spec(outputStream *st) const {
117 if( _con < TypeFunc::Parms ) {
118 st->print("%s", names[_con]);
119 } else {
120 st->print("Parm%d: ",_con-TypeFunc::Parms);
121 // Verbose and WizardMode dump bottom_type for all nodes
122 if( !Verbose && !WizardMode ) bottom_type()->dump_on(st);
123 }
124 }
125
126 void ParmNode::dump_compact_spec(outputStream *st) const {
127 if (_con < TypeFunc::Parms) {
128 st->print("%s", names[_con]);
129 } else {
130 st->print("%d:", _con-TypeFunc::Parms);
131 // unconditionally dump bottom_type
132 bottom_type()->dump_on(st);
133 }
134 }
135
136 // For a ParmNode, all immediate inputs and outputs are considered relevant
137 // both in compact and standard representation.
138 void ParmNode::related(GrowableArray<Node*> *in_rel, GrowableArray<Node*> *out_rel, bool compact) const {
139 this->collect_nodes(in_rel, 1, false, false);
140 this->collect_nodes(out_rel, -1, false, false);
141 }
142 #endif
143
144 uint ParmNode::ideal_reg() const {
145 switch( _con ) {
146 case TypeFunc::Control : // fall through
147 case TypeFunc::I_O : // fall through
148 case TypeFunc::Memory : return 0;
149 case TypeFunc::FramePtr : // fall through
150 case TypeFunc::ReturnAdr: return Op_RegP;
151 default : assert( _con > TypeFunc::Parms, "" );
152 // fall through
153 case TypeFunc::Parms : {
154 // Type of argument being passed
155 const Type *t = in(0)->as_Start()->_domain->field_at(_con);
156 return t->ideal_reg();
157 }
158 }
159 ShouldNotReachHere();
160 return 0;
161 }
162
163 //=============================================================================
164 ReturnNode::ReturnNode(uint edges, Node *cntrl, Node *i_o, Node *memory, Node *frameptr, Node *retadr ) : Node(edges) {
165 init_req(TypeFunc::Control,cntrl);
166 init_req(TypeFunc::I_O,i_o);
167 init_req(TypeFunc::Memory,memory);
168 init_req(TypeFunc::FramePtr,frameptr);
169 init_req(TypeFunc::ReturnAdr,retadr);
170 }
171
172 Node *ReturnNode::Ideal(PhaseGVN *phase, bool can_reshape){
173 return remove_dead_region(phase, can_reshape) ? this : NULL;
174 }
175
176 const Type *ReturnNode::Value( PhaseTransform *phase ) const {
177 return ( phase->type(in(TypeFunc::Control)) == Type::TOP)
178 ? Type::TOP
179 : Type::BOTTOM;
180 }
181
182 // Do we Match on this edge index or not? No edges on return nodes
183 uint ReturnNode::match_edge(uint idx) const {
184 return 0;
185 }
186
187
188 #ifndef PRODUCT
189 void ReturnNode::dump_req(outputStream *st) const {
190 // Dump the required inputs, enclosed in '(' and ')'
191 uint i; // Exit value of loop
192 for (i = 0; i < req(); i++) { // For all required inputs
193 if (i == TypeFunc::Parms) st->print("returns");
194 if (in(i)) st->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx);
195 else st->print("_ ");
196 }
197 }
198 #endif
199
200 //=============================================================================
201 RethrowNode::RethrowNode(
202 Node* cntrl,
203 Node* i_o,
204 Node* memory,
205 Node* frameptr,
206 Node* ret_adr,
207 Node* exception
208 ) : Node(TypeFunc::Parms + 1) {
209 init_req(TypeFunc::Control , cntrl );
210 init_req(TypeFunc::I_O , i_o );
211 init_req(TypeFunc::Memory , memory );
212 init_req(TypeFunc::FramePtr , frameptr );
213 init_req(TypeFunc::ReturnAdr, ret_adr);
214 init_req(TypeFunc::Parms , exception);
215 }
216
217 Node *RethrowNode::Ideal(PhaseGVN *phase, bool can_reshape){
218 return remove_dead_region(phase, can_reshape) ? this : NULL;
219 }
220
221 const Type *RethrowNode::Value( PhaseTransform *phase ) const {
222 return (phase->type(in(TypeFunc::Control)) == Type::TOP)
223 ? Type::TOP
224 : Type::BOTTOM;
225 }
226
227 uint RethrowNode::match_edge(uint idx) const {
228 return 0;
229 }
230
231 #ifndef PRODUCT
232 void RethrowNode::dump_req(outputStream *st) const {
233 // Dump the required inputs, enclosed in '(' and ')'
234 uint i; // Exit value of loop
235 for (i = 0; i < req(); i++) { // For all required inputs
236 if (i == TypeFunc::Parms) st->print("exception");
237 if (in(i)) st->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx);
238 else st->print("_ ");
239 }
240 }
241 #endif
242
243 //=============================================================================
244 // Do we Match on this edge index or not? Match only target address & method
245 uint TailCallNode::match_edge(uint idx) const {
246 return TypeFunc::Parms <= idx && idx <= TypeFunc::Parms+1;
247 }
248
249 //=============================================================================
250 // Do we Match on this edge index or not? Match only target address & oop
251 uint TailJumpNode::match_edge(uint idx) const {
252 return TypeFunc::Parms <= idx && idx <= TypeFunc::Parms+1;
253 }
254
255 //=============================================================================
256 JVMState::JVMState(ciMethod* method, JVMState* caller) :
257 _method(method) {
258 assert(method != NULL, "must be valid call site");
259 _reexecute = Reexecute_Undefined;
260 debug_only(_bci = -99); // random garbage value
261 debug_only(_map = (SafePointNode*)-1);
262 _caller = caller;
263 _depth = 1 + (caller == NULL ? 0 : caller->depth());
264 _locoff = TypeFunc::Parms;
265 _stkoff = _locoff + _method->max_locals();
266 _monoff = _stkoff + _method->max_stack();
267 _scloff = _monoff;
268 _endoff = _monoff;
269 _sp = 0;
270 }
271 JVMState::JVMState(int stack_size) :
272 _method(NULL) {
273 _bci = InvocationEntryBci;
274 _reexecute = Reexecute_Undefined;
275 debug_only(_map = (SafePointNode*)-1);
276 _caller = NULL;
277 _depth = 1;
278 _locoff = TypeFunc::Parms;
279 _stkoff = _locoff;
280 _monoff = _stkoff + stack_size;
281 _scloff = _monoff;
282 _endoff = _monoff;
283 _sp = 0;
284 }
285
286 //--------------------------------of_depth-------------------------------------
287 JVMState* JVMState::of_depth(int d) const {
288 const JVMState* jvmp = this;
289 assert(0 < d && (uint)d <= depth(), "oob");
290 for (int skip = depth() - d; skip > 0; skip--) {
291 jvmp = jvmp->caller();
292 }
293 assert(jvmp->depth() == (uint)d, "found the right one");
294 return (JVMState*)jvmp;
295 }
296
297 //-----------------------------same_calls_as-----------------------------------
298 bool JVMState::same_calls_as(const JVMState* that) const {
299 if (this == that) return true;
300 if (this->depth() != that->depth()) return false;
301 const JVMState* p = this;
302 const JVMState* q = that;
303 for (;;) {
304 if (p->_method != q->_method) return false;
305 if (p->_method == NULL) return true; // bci is irrelevant
306 if (p->_bci != q->_bci) return false;
307 if (p->_reexecute != q->_reexecute) return false;
308 p = p->caller();
309 q = q->caller();
310 if (p == q) return true;
311 assert(p != NULL && q != NULL, "depth check ensures we don't run off end");
312 }
313 }
314
315 //------------------------------debug_start------------------------------------
316 uint JVMState::debug_start() const {
317 debug_only(JVMState* jvmroot = of_depth(1));
318 assert(jvmroot->locoff() <= this->locoff(), "youngest JVMState must be last");
319 return of_depth(1)->locoff();
320 }
321
322 //-------------------------------debug_end-------------------------------------
323 uint JVMState::debug_end() const {
324 debug_only(JVMState* jvmroot = of_depth(1));
325 assert(jvmroot->endoff() <= this->endoff(), "youngest JVMState must be last");
326 return endoff();
327 }
328
329 //------------------------------debug_depth------------------------------------
330 uint JVMState::debug_depth() const {
331 uint total = 0;
332 for (const JVMState* jvmp = this; jvmp != NULL; jvmp = jvmp->caller()) {
333 total += jvmp->debug_size();
334 }
335 return total;
336 }
337
338 #ifndef PRODUCT
339
340 //------------------------------format_helper----------------------------------
341 // Given an allocation (a Chaitin object) and a Node decide if the Node carries
342 // any defined value or not. If it does, print out the register or constant.
343 static void format_helper( PhaseRegAlloc *regalloc, outputStream* st, Node *n, const char *msg, uint i, GrowableArray<SafePointScalarObjectNode*> *scobjs ) {
344 if (n == NULL) { st->print(" NULL"); return; }
345 if (n->is_SafePointScalarObject()) {
346 // Scalar replacement.
347 SafePointScalarObjectNode* spobj = n->as_SafePointScalarObject();
348 scobjs->append_if_missing(spobj);
349 int sco_n = scobjs->find(spobj);
350 assert(sco_n >= 0, "");
351 st->print(" %s%d]=#ScObj" INT32_FORMAT, msg, i, sco_n);
352 return;
353 }
354 if (regalloc->node_regs_max_index() > 0 &&
355 OptoReg::is_valid(regalloc->get_reg_first(n))) { // Check for undefined
356 char buf[50];
357 regalloc->dump_register(n,buf);
358 st->print(" %s%d]=%s",msg,i,buf);
359 } else { // No register, but might be constant
360 const Type *t = n->bottom_type();
361 switch (t->base()) {
362 case Type::Int:
363 st->print(" %s%d]=#" INT32_FORMAT,msg,i,t->is_int()->get_con());
364 break;
365 case Type::AnyPtr:
366 assert( t == TypePtr::NULL_PTR || n->in_dump(), "" );
367 st->print(" %s%d]=#NULL",msg,i);
368 break;
369 case Type::AryPtr:
370 case Type::InstPtr:
371 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,p2i(t->isa_oopptr()->const_oop()));
372 break;
373 case Type::KlassPtr:
374 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,p2i(t->make_ptr()->isa_klassptr()->klass()));
375 break;
376 case Type::MetadataPtr:
377 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,p2i(t->make_ptr()->isa_metadataptr()->metadata()));
378 break;
379 case Type::NarrowOop:
380 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,p2i(t->make_ptr()->isa_oopptr()->const_oop()));
381 break;
382 case Type::RawPtr:
383 st->print(" %s%d]=#Raw" INTPTR_FORMAT,msg,i,p2i(t->is_rawptr()));
384 break;
385 case Type::DoubleCon:
386 st->print(" %s%d]=#%fD",msg,i,t->is_double_constant()->_d);
387 break;
388 case Type::FloatCon:
389 st->print(" %s%d]=#%fF",msg,i,t->is_float_constant()->_f);
390 break;
391 case Type::Long:
392 st->print(" %s%d]=#" INT64_FORMAT,msg,i,(int64_t)(t->is_long()->get_con()));
393 break;
394 case Type::Half:
395 case Type::Top:
396 st->print(" %s%d]=_",msg,i);
397 break;
398 default: ShouldNotReachHere();
399 }
400 }
401 }
402
403 //------------------------------format-----------------------------------------
404 void JVMState::format(PhaseRegAlloc *regalloc, const Node *n, outputStream* st) const {
405 st->print(" #");
406 if (_method) {
407 _method->print_short_name(st);
408 st->print(" @ bci:%d ",_bci);
409 } else {
410 st->print_cr(" runtime stub ");
411 return;
412 }
413 if (n->is_MachSafePoint()) {
414 GrowableArray<SafePointScalarObjectNode*> scobjs;
415 MachSafePointNode *mcall = n->as_MachSafePoint();
416 uint i;
417 // Print locals
418 for (i = 0; i < (uint)loc_size(); i++)
419 format_helper(regalloc, st, mcall->local(this, i), "L[", i, &scobjs);
420 // Print stack
421 for (i = 0; i < (uint)stk_size(); i++) {
422 if ((uint)(_stkoff + i) >= mcall->len())
423 st->print(" oob ");
424 else
425 format_helper(regalloc, st, mcall->stack(this, i), "STK[", i, &scobjs);
426 }
427 for (i = 0; (int)i < nof_monitors(); i++) {
428 Node *box = mcall->monitor_box(this, i);
429 Node *obj = mcall->monitor_obj(this, i);
430 if (regalloc->node_regs_max_index() > 0 &&
431 OptoReg::is_valid(regalloc->get_reg_first(box))) {
432 box = BoxLockNode::box_node(box);
433 format_helper(regalloc, st, box, "MON-BOX[", i, &scobjs);
434 } else {
435 OptoReg::Name box_reg = BoxLockNode::reg(box);
436 st->print(" MON-BOX%d=%s+%d",
437 i,
438 OptoReg::regname(OptoReg::c_frame_pointer),
439 regalloc->reg2offset(box_reg));
440 }
441 const char* obj_msg = "MON-OBJ[";
442 if (EliminateLocks) {
443 if (BoxLockNode::box_node(box)->is_eliminated())
444 obj_msg = "MON-OBJ(LOCK ELIMINATED)[";
445 }
446 format_helper(regalloc, st, obj, obj_msg, i, &scobjs);
447 }
448
449 for (i = 0; i < (uint)scobjs.length(); i++) {
450 // Scalar replaced objects.
451 st->cr();
452 st->print(" # ScObj" INT32_FORMAT " ", i);
453 SafePointScalarObjectNode* spobj = scobjs.at(i);
454 ciKlass* cik = spobj->bottom_type()->is_oopptr()->klass();
455 assert(cik->is_instance_klass() ||
456 cik->is_array_klass(), "Not supported allocation.");
457 ciInstanceKlass *iklass = NULL;
458 if (cik->is_instance_klass()) {
459 cik->print_name_on(st);
460 iklass = cik->as_instance_klass();
461 } else if (cik->is_type_array_klass()) {
462 cik->as_array_klass()->base_element_type()->print_name_on(st);
463 st->print("[%d]", spobj->n_fields());
464 } else if (cik->is_obj_array_klass()) {
465 ciKlass* cie = cik->as_obj_array_klass()->base_element_klass();
466 if (cie->is_instance_klass()) {
467 cie->print_name_on(st);
468 } else if (cie->is_type_array_klass()) {
469 cie->as_array_klass()->base_element_type()->print_name_on(st);
470 } else {
471 ShouldNotReachHere();
472 }
473 st->print("[%d]", spobj->n_fields());
474 int ndim = cik->as_array_klass()->dimension() - 1;
475 while (ndim-- > 0) {
476 st->print("[]");
477 }
478 }
479 st->print("={");
480 uint nf = spobj->n_fields();
481 if (nf > 0) {
482 uint first_ind = spobj->first_index(mcall->jvms());
483 Node* fld_node = mcall->in(first_ind);
484 ciField* cifield;
485 if (iklass != NULL) {
486 st->print(" [");
487 cifield = iklass->nonstatic_field_at(0);
488 cifield->print_name_on(st);
489 format_helper(regalloc, st, fld_node, ":", 0, &scobjs);
490 } else {
491 format_helper(regalloc, st, fld_node, "[", 0, &scobjs);
492 }
493 for (uint j = 1; j < nf; j++) {
494 fld_node = mcall->in(first_ind+j);
495 if (iklass != NULL) {
496 st->print(", [");
497 cifield = iklass->nonstatic_field_at(j);
498 cifield->print_name_on(st);
499 format_helper(regalloc, st, fld_node, ":", j, &scobjs);
500 } else {
501 format_helper(regalloc, st, fld_node, ", [", j, &scobjs);
502 }
503 }
504 }
505 st->print(" }");
506 }
507 }
508 st->cr();
509 if (caller() != NULL) caller()->format(regalloc, n, st);
510 }
511
512
513 void JVMState::dump_spec(outputStream *st) const {
514 if (_method != NULL) {
515 bool printed = false;
516 if (!Verbose) {
517 // The JVMS dumps make really, really long lines.
518 // Take out the most boring parts, which are the package prefixes.
519 char buf[500];
520 stringStream namest(buf, sizeof(buf));
521 _method->print_short_name(&namest);
522 if (namest.count() < sizeof(buf)) {
523 const char* name = namest.base();
524 if (name[0] == ' ') ++name;
525 const char* endcn = strchr(name, ':'); // end of class name
526 if (endcn == NULL) endcn = strchr(name, '(');
527 if (endcn == NULL) endcn = name + strlen(name);
528 while (endcn > name && endcn[-1] != '.' && endcn[-1] != '/')
529 --endcn;
530 st->print(" %s", endcn);
531 printed = true;
532 }
533 }
534 if (!printed)
535 _method->print_short_name(st);
536 st->print(" @ bci:%d",_bci);
537 if(_reexecute == Reexecute_True)
538 st->print(" reexecute");
539 } else {
540 st->print(" runtime stub");
541 }
542 if (caller() != NULL) caller()->dump_spec(st);
543 }
544
545
546 void JVMState::dump_on(outputStream* st) const {
547 bool print_map = _map && !((uintptr_t)_map & 1) &&
548 ((caller() == NULL) || (caller()->map() != _map));
549 if (print_map) {
550 if (_map->len() > _map->req()) { // _map->has_exceptions()
551 Node* ex = _map->in(_map->req()); // _map->next_exception()
552 // skip the first one; it's already being printed
553 while (ex != NULL && ex->len() > ex->req()) {
554 ex = ex->in(ex->req()); // ex->next_exception()
555 ex->dump(1);
556 }
557 }
558 _map->dump(Verbose ? 2 : 1);
559 }
560 if (caller() != NULL) {
561 caller()->dump_on(st);
562 }
563 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=",
564 depth(), locoff(), stkoff(), argoff(), monoff(), scloff(), endoff(), monitor_depth(), sp(), bci(), should_reexecute()?"true":"false");
565 if (_method == NULL) {
566 st->print_cr("(none)");
567 } else {
568 _method->print_name(st);
569 st->cr();
570 if (bci() >= 0 && bci() < _method->code_size()) {
571 st->print(" bc: ");
572 _method->print_codes_on(bci(), bci()+1, st);
573 }
574 }
575 }
576
577 // Extra way to dump a jvms from the debugger,
578 // to avoid a bug with C++ member function calls.
579 void dump_jvms(JVMState* jvms) {
580 jvms->dump();
581 }
582 #endif
583
584 //--------------------------clone_shallow--------------------------------------
585 JVMState* JVMState::clone_shallow(Compile* C) const {
586 JVMState* n = has_method() ? new (C) JVMState(_method, _caller) : new (C) JVMState(0);
587 n->set_bci(_bci);
588 n->_reexecute = _reexecute;
589 n->set_locoff(_locoff);
590 n->set_stkoff(_stkoff);
591 n->set_monoff(_monoff);
592 n->set_scloff(_scloff);
593 n->set_endoff(_endoff);
594 n->set_sp(_sp);
595 n->set_map(_map);
596 return n;
597 }
598
599 //---------------------------clone_deep----------------------------------------
600 JVMState* JVMState::clone_deep(Compile* C) const {
601 JVMState* n = clone_shallow(C);
602 for (JVMState* p = n; p->_caller != NULL; p = p->_caller) {
603 p->_caller = p->_caller->clone_shallow(C);
604 }
605 assert(n->depth() == depth(), "sanity");
606 assert(n->debug_depth() == debug_depth(), "sanity");
607 return n;
608 }
609
610 /**
611 * Reset map for all callers
612 */
613 void JVMState::set_map_deep(SafePointNode* map) {
614 for (JVMState* p = this; p->_caller != NULL; p = p->_caller) {
615 p->set_map(map);
616 }
617 }
618
619 // Adapt offsets in in-array after adding or removing an edge.
620 // Prerequisite is that the JVMState is used by only one node.
621 void JVMState::adapt_position(int delta) {
622 for (JVMState* jvms = this; jvms != NULL; jvms = jvms->caller()) {
623 jvms->set_locoff(jvms->locoff() + delta);
624 jvms->set_stkoff(jvms->stkoff() + delta);
625 jvms->set_monoff(jvms->monoff() + delta);
626 jvms->set_scloff(jvms->scloff() + delta);
627 jvms->set_endoff(jvms->endoff() + delta);
628 }
629 }
630
631 // Mirror the stack size calculation in the deopt code
632 // How much stack space would we need at this point in the program in
633 // case of deoptimization?
634 int JVMState::interpreter_frame_size() const {
635 const JVMState* jvms = this;
636 int size = 0;
637 int callee_parameters = 0;
638 int callee_locals = 0;
639 int extra_args = method()->max_stack() - stk_size();
640
641 while (jvms != NULL) {
642 int locks = jvms->nof_monitors();
643 int temps = jvms->stk_size();
644 bool is_top_frame = (jvms == this);
645 ciMethod* method = jvms->method();
646
647 int frame_size = BytesPerWord * Interpreter::size_activation(method->max_stack(),
648 temps + callee_parameters,
649 extra_args,
650 locks,
651 callee_parameters,
652 callee_locals,
653 is_top_frame);
654 size += frame_size;
655
656 callee_parameters = method->size_of_parameters();
657 callee_locals = method->max_locals();
658 extra_args = 0;
659 jvms = jvms->caller();
660 }
661 return size + Deoptimization::last_frame_adjust(0, callee_locals) * BytesPerWord;
662 }
663
664 //=============================================================================
665 uint CallNode::cmp( const Node &n ) const
666 { return _tf == ((CallNode&)n)._tf && _jvms == ((CallNode&)n)._jvms; }
667 #ifndef PRODUCT
668 void CallNode::dump_req(outputStream *st) const {
669 // Dump the required inputs, enclosed in '(' and ')'
670 uint i; // Exit value of loop
671 for (i = 0; i < req(); i++) { // For all required inputs
672 if (i == TypeFunc::Parms) st->print("(");
673 if (in(i)) st->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx);
674 else st->print("_ ");
675 }
676 st->print(")");
677 }
678
679 void CallNode::dump_spec(outputStream *st) const {
680 st->print(" ");
681 if (tf() != NULL) tf()->dump_on(st);
682 if (_cnt != COUNT_UNKNOWN) st->print(" C=%f",_cnt);
683 if (jvms() != NULL) jvms()->dump_spec(st);
684 }
685 #endif
686
687 const Type *CallNode::bottom_type() const { return tf()->range(); }
688 const Type *CallNode::Value(PhaseTransform *phase) const {
689 if (phase->type(in(0)) == Type::TOP) return Type::TOP;
690 return tf()->range();
691 }
692
693 //------------------------------calling_convention-----------------------------
694 void CallNode::calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const {
695 // Use the standard compiler calling convention
696 Matcher::calling_convention( sig_bt, parm_regs, argcnt, true );
697 }
698
699
700 //------------------------------match------------------------------------------
701 // Construct projections for control, I/O, memory-fields, ..., and
702 // return result(s) along with their RegMask info
703 Node *CallNode::match( const ProjNode *proj, const Matcher *match ) {
704 switch (proj->_con) {
705 case TypeFunc::Control:
706 case TypeFunc::I_O:
707 case TypeFunc::Memory:
708 return new MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj);
709
710 case TypeFunc::Parms+1: // For LONG & DOUBLE returns
711 assert(tf()->range()->field_at(TypeFunc::Parms+1) == Type::HALF, "");
712 // 2nd half of doubles and longs
713 return new MachProjNode(this,proj->_con, RegMask::Empty, (uint)OptoReg::Bad);
714
715 case TypeFunc::Parms: { // Normal returns
716 uint ideal_reg = tf()->range()->field_at(TypeFunc::Parms)->ideal_reg();
717 OptoRegPair regs = is_CallRuntime()
718 ? match->c_return_value(ideal_reg,true) // Calls into C runtime
719 : match-> return_value(ideal_reg,true); // Calls into compiled Java code
720 RegMask rm = RegMask(regs.first());
721 if( OptoReg::is_valid(regs.second()) )
722 rm.Insert( regs.second() );
723 return new MachProjNode(this,proj->_con,rm,ideal_reg);
724 }
725
726 case TypeFunc::ReturnAdr:
727 case TypeFunc::FramePtr:
728 default:
729 ShouldNotReachHere();
730 }
731 return NULL;
732 }
733
734 // Do we Match on this edge index or not? Match no edges
735 uint CallNode::match_edge(uint idx) const {
736 return 0;
737 }
738
739 //
740 // Determine whether the call could modify the field of the specified
741 // instance at the specified offset.
742 //
743 bool CallNode::may_modify(const TypeOopPtr *t_oop, PhaseTransform *phase) {
744 assert((t_oop != NULL), "sanity");
745 if (is_call_to_arraycopystub() && strcmp(_name, "unsafe_arraycopy") != 0) {
746 const TypeTuple* args = _tf->domain();
747 Node* dest = NULL;
748 // Stubs that can be called once an ArrayCopyNode is expanded have
749 // different signatures. Look for the second pointer argument,
750 // that is the destination of the copy.
751 for (uint i = TypeFunc::Parms, j = 0; i < args->cnt(); i++) {
752 if (args->field_at(i)->isa_ptr()) {
753 j++;
754 if (j == 2) {
755 dest = in(i);
756 break;
757 }
758 }
759 }
760 if (!dest->is_top() && may_modify_arraycopy_helper(phase->type(dest)->is_oopptr(), t_oop, phase)) {
761 return true;
762 }
763 return false;
764 }
765 if (t_oop->is_known_instance()) {
766 // The instance_id is set only for scalar-replaceable allocations which
767 // are not passed as arguments according to Escape Analysis.
768 return false;
769 }
770 if (t_oop->is_ptr_to_boxed_value()) {
771 ciKlass* boxing_klass = t_oop->klass();
772 if (is_CallStaticJava() && as_CallStaticJava()->is_boxing_method()) {
773 // Skip unrelated boxing methods.
774 Node* proj = proj_out(TypeFunc::Parms);
775 if ((proj == NULL) || (phase->type(proj)->is_instptr()->klass() != boxing_klass)) {
776 return false;
777 }
778 }
779 if (is_CallJava() && as_CallJava()->method() != NULL) {
780 ciMethod* meth = as_CallJava()->method();
781 if (meth->is_getter()) {
782 return false;
783 }
784 // May modify (by reflection) if an boxing object is passed
785 // as argument or returned.
786 if (returns_pointer() && (proj_out(TypeFunc::Parms) != NULL)) {
787 Node* proj = proj_out(TypeFunc::Parms);
788 const TypeInstPtr* inst_t = phase->type(proj)->isa_instptr();
789 if ((inst_t != NULL) && (!inst_t->klass_is_exact() ||
790 (inst_t->klass() == boxing_klass))) {
791 return true;
792 }
793 }
794 const TypeTuple* d = tf()->domain();
795 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) {
796 const TypeInstPtr* inst_t = d->field_at(i)->isa_instptr();
797 if ((inst_t != NULL) && (!inst_t->klass_is_exact() ||
798 (inst_t->klass() == boxing_klass))) {
799 return true;
800 }
801 }
802 return false;
803 }
804 }
805 return true;
806 }
807
808 // Does this call have a direct reference to n other than debug information?
809 bool CallNode::has_non_debug_use(Node *n) {
810 const TypeTuple * d = tf()->domain();
811 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) {
812 Node *arg = in(i);
813 if (arg == n) {
814 return true;
815 }
816 }
817 return false;
818 }
819
820 // Returns the unique CheckCastPP of a call
821 // or 'this' if there are several CheckCastPP or unexpected uses
822 // or returns NULL if there is no one.
823 Node *CallNode::result_cast() {
824 Node *cast = NULL;
825
826 Node *p = proj_out(TypeFunc::Parms);
827 if (p == NULL)
828 return NULL;
829
830 for (DUIterator_Fast imax, i = p->fast_outs(imax); i < imax; i++) {
831 Node *use = p->fast_out(i);
832 if (use->is_CheckCastPP()) {
833 if (cast != NULL) {
834 return this; // more than 1 CheckCastPP
835 }
836 cast = use;
837 } else if (!use->is_Initialize() &&
838 !use->is_AddP() &&
839 use->Opcode() != Op_MemBarStoreStore) {
840 // Expected uses are restricted to a CheckCastPP, an Initialize
841 // node, a MemBarStoreStore (clone) and AddP nodes. If we
842 // encounter any other use (a Phi node can be seen in rare
843 // cases) return this to prevent incorrect optimizations.
844 return this;
845 }
846 }
847 return cast;
848 }
849
850
851 void CallNode::extract_projections(CallProjections* projs, bool separate_io_proj, bool do_asserts) {
852 projs->fallthrough_proj = NULL;
853 projs->fallthrough_catchproj = NULL;
854 projs->fallthrough_ioproj = NULL;
855 projs->catchall_ioproj = NULL;
856 projs->catchall_catchproj = NULL;
857 projs->fallthrough_memproj = NULL;
858 projs->catchall_memproj = NULL;
859 projs->resproj = NULL;
860 projs->exobj = NULL;
861
862 for (DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++) {
863 ProjNode *pn = fast_out(i)->as_Proj();
864 if (pn->outcnt() == 0) continue;
865 switch (pn->_con) {
866 case TypeFunc::Control:
867 {
868 // For Control (fallthrough) and I_O (catch_all_index) we have CatchProj -> Catch -> Proj
869 projs->fallthrough_proj = pn;
870 DUIterator_Fast jmax, j = pn->fast_outs(jmax);
871 const Node *cn = pn->fast_out(j);
872 if (cn->is_Catch()) {
873 ProjNode *cpn = NULL;
874 for (DUIterator_Fast kmax, k = cn->fast_outs(kmax); k < kmax; k++) {
875 cpn = cn->fast_out(k)->as_Proj();
876 assert(cpn->is_CatchProj(), "must be a CatchProjNode");
877 if (cpn->_con == CatchProjNode::fall_through_index)
878 projs->fallthrough_catchproj = cpn;
879 else {
880 assert(cpn->_con == CatchProjNode::catch_all_index, "must be correct index.");
881 projs->catchall_catchproj = cpn;
882 }
883 }
884 }
885 break;
886 }
887 case TypeFunc::I_O:
888 if (pn->_is_io_use)
889 projs->catchall_ioproj = pn;
890 else
891 projs->fallthrough_ioproj = pn;
892 for (DUIterator j = pn->outs(); pn->has_out(j); j++) {
893 Node* e = pn->out(j);
894 if (e->Opcode() == Op_CreateEx && e->in(0)->is_CatchProj() && e->outcnt() > 0) {
895 assert(projs->exobj == NULL, "only one");
896 projs->exobj = e;
897 }
898 }
899 break;
900 case TypeFunc::Memory:
901 if (pn->_is_io_use)
902 projs->catchall_memproj = pn;
903 else
904 projs->fallthrough_memproj = pn;
905 break;
906 case TypeFunc::Parms:
907 projs->resproj = pn;
908 break;
909 default:
910 assert(false, "unexpected projection from allocation node.");
911 }
912 }
913
914 // The resproj may not exist because the result could be ignored
915 // and the exception object may not exist if an exception handler
916 // swallows the exception but all the other must exist and be found.
917 assert(projs->fallthrough_proj != NULL, "must be found");
918 do_asserts = do_asserts && !Compile::current()->inlining_incrementally();
919 assert(!do_asserts || projs->fallthrough_catchproj != NULL, "must be found");
920 assert(!do_asserts || projs->fallthrough_memproj != NULL, "must be found");
921 assert(!do_asserts || projs->fallthrough_ioproj != NULL, "must be found");
922 assert(!do_asserts || projs->catchall_catchproj != NULL, "must be found");
923 if (separate_io_proj) {
924 assert(!do_asserts || projs->catchall_memproj != NULL, "must be found");
925 assert(!do_asserts || projs->catchall_ioproj != NULL, "must be found");
926 }
927 }
928
929 Node *CallNode::Ideal(PhaseGVN *phase, bool can_reshape) {
930 CallGenerator* cg = generator();
931 if (can_reshape && cg != NULL && cg->is_mh_late_inline() && !cg->already_attempted()) {
932 // Check whether this MH handle call becomes a candidate for inlining
933 ciMethod* callee = cg->method();
934 vmIntrinsics::ID iid = callee->intrinsic_id();
935 if (iid == vmIntrinsics::_invokeBasic) {
936 if (in(TypeFunc::Parms)->Opcode() == Op_ConP) {
937 phase->C->prepend_late_inline(cg);
938 set_generator(NULL);
939 }
940 } else {
941 assert(callee->has_member_arg(), "wrong type of call?");
942 if (in(TypeFunc::Parms + callee->arg_size() - 1)->Opcode() == Op_ConP) {
943 phase->C->prepend_late_inline(cg);
944 set_generator(NULL);
945 }
946 }
947 }
948 return SafePointNode::Ideal(phase, can_reshape);
949 }
950
951 bool CallNode::is_call_to_arraycopystub() const {
952 if (_name != NULL && strstr(_name, "arraycopy") != 0) {
953 return true;
954 }
955 return false;
956 }
957
958 //=============================================================================
959 uint CallJavaNode::size_of() const { return sizeof(*this); }
960 uint CallJavaNode::cmp( const Node &n ) const {
961 CallJavaNode &call = (CallJavaNode&)n;
962 return CallNode::cmp(call) && _method == call._method &&
963 _override_symbolic_info == call._override_symbolic_info;
964 }
965 #ifndef PRODUCT
966 void CallJavaNode::dump_spec(outputStream *st) const {
967 if( _method ) _method->print_short_name(st);
968 CallNode::dump_spec(st);
969 }
970
971 void CallJavaNode::dump_compact_spec(outputStream* st) const {
972 if (_method) {
973 _method->print_short_name(st);
974 } else {
975 st->print("<?>");
976 }
977 }
978 #endif
979
980 //=============================================================================
981 uint CallStaticJavaNode::size_of() const { return sizeof(*this); }
982 uint CallStaticJavaNode::cmp( const Node &n ) const {
983 CallStaticJavaNode &call = (CallStaticJavaNode&)n;
984 return CallJavaNode::cmp(call);
985 }
986
987 //----------------------------uncommon_trap_request----------------------------
988 // If this is an uncommon trap, return the request code, else zero.
989 int CallStaticJavaNode::uncommon_trap_request() const {
990 if (_name != NULL && !strcmp(_name, "uncommon_trap")) {
991 return extract_uncommon_trap_request(this);
992 }
993 return 0;
994 }
995 int CallStaticJavaNode::extract_uncommon_trap_request(const Node* call) {
996 #ifndef PRODUCT
997 if (!(call->req() > TypeFunc::Parms &&
998 call->in(TypeFunc::Parms) != NULL &&
999 call->in(TypeFunc::Parms)->is_Con() &&
1000 call->in(TypeFunc::Parms)->bottom_type()->isa_int())) {
1001 assert(in_dump() != 0, "OK if dumping");
1002 tty->print("[bad uncommon trap]");
1003 return 0;
1004 }
1005 #endif
1006 return call->in(TypeFunc::Parms)->bottom_type()->is_int()->get_con();
1007 }
1008
1009 #ifndef PRODUCT
1010 void CallStaticJavaNode::dump_spec(outputStream *st) const {
1011 st->print("# Static ");
1012 if (_name != NULL) {
1013 st->print("%s", _name);
1014 int trap_req = uncommon_trap_request();
1015 if (trap_req != 0) {
1016 char buf[100];
1017 st->print("(%s)",
1018 Deoptimization::format_trap_request(buf, sizeof(buf),
1019 trap_req));
1020 }
1021 st->print(" ");
1022 }
1023 CallJavaNode::dump_spec(st);
1024 }
1025
1026 void CallStaticJavaNode::dump_compact_spec(outputStream* st) const {
1027 if (_method) {
1028 _method->print_short_name(st);
1029 } else if (_name) {
1030 st->print("%s", _name);
1031 } else {
1032 st->print("<?>");
1033 }
1034 }
1035 #endif
1036
1037 //=============================================================================
1038 uint CallDynamicJavaNode::size_of() const { return sizeof(*this); }
1039 uint CallDynamicJavaNode::cmp( const Node &n ) const {
1040 CallDynamicJavaNode &call = (CallDynamicJavaNode&)n;
1041 return CallJavaNode::cmp(call);
1042 }
1043 #ifndef PRODUCT
1044 void CallDynamicJavaNode::dump_spec(outputStream *st) const {
1045 st->print("# Dynamic ");
1046 CallJavaNode::dump_spec(st);
1047 }
1048 #endif
1049
1050 //=============================================================================
1051 uint CallRuntimeNode::size_of() const { return sizeof(*this); }
1052 uint CallRuntimeNode::cmp( const Node &n ) const {
1053 CallRuntimeNode &call = (CallRuntimeNode&)n;
1054 return CallNode::cmp(call) && !strcmp(_name,call._name);
1055 }
1056 #ifndef PRODUCT
1057 void CallRuntimeNode::dump_spec(outputStream *st) const {
1058 st->print("# ");
1059 st->print("%s", _name);
1060 CallNode::dump_spec(st);
1061 }
1062 #endif
1063
1064 //------------------------------calling_convention-----------------------------
1065 void CallRuntimeNode::calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const {
1066 Matcher::c_calling_convention( sig_bt, parm_regs, argcnt );
1067 }
1068
1069 //=============================================================================
1070 //------------------------------calling_convention-----------------------------
1071
1072
1073 //=============================================================================
1074 #ifndef PRODUCT
1075 void CallLeafNode::dump_spec(outputStream *st) const {
1076 st->print("# ");
1077 st->print("%s", _name);
1078 CallNode::dump_spec(st);
1079 }
1080 #endif
1081
1082 //=============================================================================
1083
1084 void SafePointNode::set_local(JVMState* jvms, uint idx, Node *c) {
1085 assert(verify_jvms(jvms), "jvms must match");
1086 int loc = jvms->locoff() + idx;
1087 if (in(loc)->is_top() && idx > 0 && !c->is_top() ) {
1088 // If current local idx is top then local idx - 1 could
1089 // be a long/double that needs to be killed since top could
1090 // represent the 2nd half ofthe long/double.
1091 uint ideal = in(loc -1)->ideal_reg();
1092 if (ideal == Op_RegD || ideal == Op_RegL) {
1093 // set other (low index) half to top
1094 set_req(loc - 1, in(loc));
1095 }
1096 }
1097 set_req(loc, c);
1098 }
1099
1100 uint SafePointNode::size_of() const { return sizeof(*this); }
1101 uint SafePointNode::cmp( const Node &n ) const {
1102 return (&n == this); // Always fail except on self
1103 }
1104
1105 //-------------------------set_next_exception----------------------------------
1106 void SafePointNode::set_next_exception(SafePointNode* n) {
1107 assert(n == NULL || n->Opcode() == Op_SafePoint, "correct value for next_exception");
1108 if (len() == req()) {
1109 if (n != NULL) add_prec(n);
1110 } else {
1111 set_prec(req(), n);
1112 }
1113 }
1114
1115
1116 //----------------------------next_exception-----------------------------------
1117 SafePointNode* SafePointNode::next_exception() const {
1118 if (len() == req()) {
1119 return NULL;
1120 } else {
1121 Node* n = in(req());
1122 assert(n == NULL || n->Opcode() == Op_SafePoint, "no other uses of prec edges");
1123 return (SafePointNode*) n;
1124 }
1125 }
1126
1127
1128 //------------------------------Ideal------------------------------------------
1129 // Skip over any collapsed Regions
1130 Node *SafePointNode::Ideal(PhaseGVN *phase, bool can_reshape) {
1131 return remove_dead_region(phase, can_reshape) ? this : NULL;
1132 }
1133
1134 //------------------------------Identity---------------------------------------
1135 // Remove obviously duplicate safepoints
1136 Node *SafePointNode::Identity( PhaseTransform *phase ) {
1137
1138 // If you have back to back safepoints, remove one
1139 if( in(TypeFunc::Control)->is_SafePoint() )
1140 return in(TypeFunc::Control);
1141
1142 if( in(0)->is_Proj() ) {
1143 Node *n0 = in(0)->in(0);
1144 // Check if he is a call projection (except Leaf Call)
1145 if( n0->is_Catch() ) {
1146 n0 = n0->in(0)->in(0);
1147 assert( n0->is_Call(), "expect a call here" );
1148 }
1149 if( n0->is_Call() && n0->as_Call()->guaranteed_safepoint() ) {
1150 // Useless Safepoint, so remove it
1151 return in(TypeFunc::Control);
1152 }
1153 }
1154
1155 return this;
1156 }
1157
1158 //------------------------------Value------------------------------------------
1159 const Type *SafePointNode::Value( PhaseTransform *phase ) const {
1160 if( phase->type(in(0)) == Type::TOP ) return Type::TOP;
1161 if( phase->eqv( in(0), this ) ) return Type::TOP; // Dead infinite loop
1162 return Type::CONTROL;
1163 }
1164
1165 #ifndef PRODUCT
1166 void SafePointNode::dump_spec(outputStream *st) const {
1167 st->print(" SafePoint ");
1168 _replaced_nodes.dump(st);
1169 }
1170
1171 // The related nodes of a SafepointNode are all data inputs, excluding the
1172 // control boundary, as well as all outputs till level 2 (to include projection
1173 // nodes and targets). In compact mode, just include inputs till level 1 and
1174 // outputs as before.
1175 void SafePointNode::related(GrowableArray<Node*> *in_rel, GrowableArray<Node*> *out_rel, bool compact) const {
1176 if (compact) {
1177 this->collect_nodes(in_rel, 1, false, false);
1178 } else {
1179 this->collect_nodes_in_all_data(in_rel, false);
1180 }
1181 this->collect_nodes(out_rel, -2, false, false);
1182 }
1183 #endif
1184
1185 const RegMask &SafePointNode::in_RegMask(uint idx) const {
1186 if( idx < TypeFunc::Parms ) return RegMask::Empty;
1187 // Values outside the domain represent debug info
1188 return *(Compile::current()->matcher()->idealreg2debugmask[in(idx)->ideal_reg()]);
1189 }
1190 const RegMask &SafePointNode::out_RegMask() const {
1191 return RegMask::Empty;
1192 }
1193
1194
1195 void SafePointNode::grow_stack(JVMState* jvms, uint grow_by) {
1196 assert((int)grow_by > 0, "sanity");
1197 int monoff = jvms->monoff();
1198 int scloff = jvms->scloff();
1199 int endoff = jvms->endoff();
1200 assert(endoff == (int)req(), "no other states or debug info after me");
1201 Node* top = Compile::current()->top();
1202 for (uint i = 0; i < grow_by; i++) {
1203 ins_req(monoff, top);
1204 }
1205 jvms->set_monoff(monoff + grow_by);
1206 jvms->set_scloff(scloff + grow_by);
1207 jvms->set_endoff(endoff + grow_by);
1208 }
1209
1210 void SafePointNode::push_monitor(const FastLockNode *lock) {
1211 // Add a LockNode, which points to both the original BoxLockNode (the
1212 // stack space for the monitor) and the Object being locked.
1213 const int MonitorEdges = 2;
1214 assert(JVMState::logMonitorEdges == exact_log2(MonitorEdges), "correct MonitorEdges");
1215 assert(req() == jvms()->endoff(), "correct sizing");
1216 int nextmon = jvms()->scloff();
1217 if (GenerateSynchronizationCode) {
1218 ins_req(nextmon, lock->box_node());
1219 ins_req(nextmon+1, lock->obj_node());
1220 } else {
1221 Node* top = Compile::current()->top();
1222 ins_req(nextmon, top);
1223 ins_req(nextmon, top);
1224 }
1225 jvms()->set_scloff(nextmon + MonitorEdges);
1226 jvms()->set_endoff(req());
1227 }
1228
1229 void SafePointNode::pop_monitor() {
1230 // Delete last monitor from debug info
1231 debug_only(int num_before_pop = jvms()->nof_monitors());
1232 const int MonitorEdges = 2;
1233 assert(JVMState::logMonitorEdges == exact_log2(MonitorEdges), "correct MonitorEdges");
1234 int scloff = jvms()->scloff();
1235 int endoff = jvms()->endoff();
1236 int new_scloff = scloff - MonitorEdges;
1237 int new_endoff = endoff - MonitorEdges;
1238 jvms()->set_scloff(new_scloff);
1239 jvms()->set_endoff(new_endoff);
1240 while (scloff > new_scloff) del_req_ordered(--scloff);
1241 assert(jvms()->nof_monitors() == num_before_pop-1, "");
1242 }
1243
1244 Node *SafePointNode::peek_monitor_box() const {
1245 int mon = jvms()->nof_monitors() - 1;
1246 assert(mon >= 0, "most have a monitor");
1247 return monitor_box(jvms(), mon);
1248 }
1249
1250 Node *SafePointNode::peek_monitor_obj() const {
1251 int mon = jvms()->nof_monitors() - 1;
1252 assert(mon >= 0, "most have a monitor");
1253 return monitor_obj(jvms(), mon);
1254 }
1255
1256 // Do we Match on this edge index or not? Match no edges
1257 uint SafePointNode::match_edge(uint idx) const {
1258 if( !needs_polling_address_input() )
1259 return 0;
1260
1261 return (TypeFunc::Parms == idx);
1262 }
1263
1264 //============== SafePointScalarObjectNode ==============
1265
1266 SafePointScalarObjectNode::SafePointScalarObjectNode(const TypeOopPtr* tp,
1267 #ifdef ASSERT
1268 AllocateNode* alloc,
1269 #endif
1270 uint first_index,
1271 uint n_fields) :
1272 TypeNode(tp, 1), // 1 control input -- seems required. Get from root.
1273 #ifdef ASSERT
1274 _alloc(alloc),
1275 #endif
1276 _first_index(first_index),
1277 _n_fields(n_fields)
1278 {
1279 init_class_id(Class_SafePointScalarObject);
1280 }
1281
1282 // Do not allow value-numbering for SafePointScalarObject node.
1283 uint SafePointScalarObjectNode::hash() const { return NO_HASH; }
1284 uint SafePointScalarObjectNode::cmp( const Node &n ) const {
1285 return (&n == this); // Always fail except on self
1286 }
1287
1288 uint SafePointScalarObjectNode::ideal_reg() const {
1289 return 0; // No matching to machine instruction
1290 }
1291
1292 const RegMask &SafePointScalarObjectNode::in_RegMask(uint idx) const {
1293 return *(Compile::current()->matcher()->idealreg2debugmask[in(idx)->ideal_reg()]);
1294 }
1295
1296 const RegMask &SafePointScalarObjectNode::out_RegMask() const {
1297 return RegMask::Empty;
1298 }
1299
1300 uint SafePointScalarObjectNode::match_edge(uint idx) const {
1301 return 0;
1302 }
1303
1304 SafePointScalarObjectNode*
1305 SafePointScalarObjectNode::clone(Dict* sosn_map) const {
1306 void* cached = (*sosn_map)[(void*)this];
1307 if (cached != NULL) {
1308 return (SafePointScalarObjectNode*)cached;
1309 }
1310 SafePointScalarObjectNode* res = (SafePointScalarObjectNode*)Node::clone();
1311 sosn_map->Insert((void*)this, (void*)res);
1312 return res;
1313 }
1314
1315
1316 #ifndef PRODUCT
1317 void SafePointScalarObjectNode::dump_spec(outputStream *st) const {
1318 st->print(" # fields@[%d..%d]", first_index(),
1319 first_index() + n_fields() - 1);
1320 }
1321
1322 #endif
1323
1324 //=============================================================================
1325 uint AllocateNode::size_of() const { return sizeof(*this); }
1326
1327 AllocateNode::AllocateNode(Compile* C, const TypeFunc *atype,
1328 Node *ctrl, Node *mem, Node *abio,
1329 Node *size, Node *klass_node, Node *initial_test)
1330 : CallNode(atype, NULL, TypeRawPtr::BOTTOM)
1331 {
1332 init_class_id(Class_Allocate);
1333 init_flags(Flag_is_macro);
1334 _is_scalar_replaceable = false;
1335 _is_non_escaping = false;
1336 Node *topnode = C->top();
1337
1338 init_req( TypeFunc::Control , ctrl );
1339 init_req( TypeFunc::I_O , abio );
1340 init_req( TypeFunc::Memory , mem );
1341 init_req( TypeFunc::ReturnAdr, topnode );
1342 init_req( TypeFunc::FramePtr , topnode );
1343 init_req( AllocSize , size);
1344 init_req( KlassNode , klass_node);
1345 init_req( InitialTest , initial_test);
1346 init_req( ALength , topnode);
1347 C->add_macro_node(this);
1348 }
1349
1350 //=============================================================================
1351 Node* AllocateArrayNode::Ideal(PhaseGVN *phase, bool can_reshape) {
1352 if (remove_dead_region(phase, can_reshape)) return this;
1353 // Don't bother trying to transform a dead node
1354 if (in(0) && in(0)->is_top()) return NULL;
1355
1356 const Type* type = phase->type(Ideal_length());
1357 if (type->isa_int() && type->is_int()->_hi < 0) {
1358 if (can_reshape) {
1359 PhaseIterGVN *igvn = phase->is_IterGVN();
1360 // Unreachable fall through path (negative array length),
1361 // the allocation can only throw so disconnect it.
1362 Node* proj = proj_out(TypeFunc::Control);
1363 Node* catchproj = NULL;
1364 if (proj != NULL) {
1365 for (DUIterator_Fast imax, i = proj->fast_outs(imax); i < imax; i++) {
1366 Node *cn = proj->fast_out(i);
1367 if (cn->is_Catch()) {
1368 catchproj = cn->as_Multi()->proj_out(CatchProjNode::fall_through_index);
1369 break;
1370 }
1371 }
1372 }
1373 if (catchproj != NULL && catchproj->outcnt() > 0 &&
1374 (catchproj->outcnt() > 1 ||
1375 catchproj->unique_out()->Opcode() != Op_Halt)) {
1376 assert(catchproj->is_CatchProj(), "must be a CatchProjNode");
1377 Node* nproj = catchproj->clone();
1378 igvn->register_new_node_with_optimizer(nproj);
1379
1380 Node *frame = new ParmNode( phase->C->start(), TypeFunc::FramePtr );
1381 frame = phase->transform(frame);
1382 // Halt & Catch Fire
1383 Node *halt = new HaltNode( nproj, frame );
1384 phase->C->root()->add_req(halt);
1385 phase->transform(halt);
1386
1387 igvn->replace_node(catchproj, phase->C->top());
1388 return this;
1389 }
1390 } else {
1391 // Can't correct it during regular GVN so register for IGVN
1392 phase->C->record_for_igvn(this);
1393 }
1394 }
1395 return NULL;
1396 }
1397
1398 // Retrieve the length from the AllocateArrayNode. Narrow the type with a
1399 // CastII, if appropriate. If we are not allowed to create new nodes, and
1400 // a CastII is appropriate, return NULL.
1401 Node *AllocateArrayNode::make_ideal_length(const TypeOopPtr* oop_type, PhaseTransform *phase, bool allow_new_nodes) {
1402 Node *length = in(AllocateNode::ALength);
1403 assert(length != NULL, "length is not null");
1404
1405 const TypeInt* length_type = phase->find_int_type(length);
1406 const TypeAryPtr* ary_type = oop_type->isa_aryptr();
1407
1408 if (ary_type != NULL && length_type != NULL) {
1409 const TypeInt* narrow_length_type = ary_type->narrow_size_type(length_type);
1410 if (narrow_length_type != length_type) {
1411 // Assert one of:
1412 // - the narrow_length is 0
1413 // - the narrow_length is not wider than length
1414 assert(narrow_length_type == TypeInt::ZERO ||
1415 length_type->is_con() && narrow_length_type->is_con() &&
1416 (narrow_length_type->_hi <= length_type->_lo) ||
1417 (narrow_length_type->_hi <= length_type->_hi &&
1418 narrow_length_type->_lo >= length_type->_lo),
1419 "narrow type must be narrower than length type");
1420
1421 // Return NULL if new nodes are not allowed
1422 if (!allow_new_nodes) return NULL;
1423 // Create a cast which is control dependent on the initialization to
1424 // propagate the fact that the array length must be positive.
1425 length = new CastIINode(length, narrow_length_type);
1426 length->set_req(0, initialization()->proj_out(0));
1427 }
1428 }
1429
1430 return length;
1431 }
1432
1433 //=============================================================================
1434 uint LockNode::size_of() const { return sizeof(*this); }
1435
1436 // Redundant lock elimination
1437 //
1438 // There are various patterns of locking where we release and
1439 // immediately reacquire a lock in a piece of code where no operations
1440 // occur in between that would be observable. In those cases we can
1441 // skip releasing and reacquiring the lock without violating any
1442 // fairness requirements. Doing this around a loop could cause a lock
1443 // to be held for a very long time so we concentrate on non-looping
1444 // control flow. We also require that the operations are fully
1445 // redundant meaning that we don't introduce new lock operations on
1446 // some paths so to be able to eliminate it on others ala PRE. This
1447 // would probably require some more extensive graph manipulation to
1448 // guarantee that the memory edges were all handled correctly.
1449 //
1450 // Assuming p is a simple predicate which can't trap in any way and s
1451 // is a synchronized method consider this code:
1452 //
1453 // s();
1454 // if (p)
1455 // s();
1456 // else
1457 // s();
1458 // s();
1459 //
1460 // 1. The unlocks of the first call to s can be eliminated if the
1461 // locks inside the then and else branches are eliminated.
1462 //
1463 // 2. The unlocks of the then and else branches can be eliminated if
1464 // the lock of the final call to s is eliminated.
1465 //
1466 // Either of these cases subsumes the simple case of sequential control flow
1467 //
1468 // Addtionally we can eliminate versions without the else case:
1469 //
1470 // s();
1471 // if (p)
1472 // s();
1473 // s();
1474 //
1475 // 3. In this case we eliminate the unlock of the first s, the lock
1476 // and unlock in the then case and the lock in the final s.
1477 //
1478 // Note also that in all these cases the then/else pieces don't have
1479 // to be trivial as long as they begin and end with synchronization
1480 // operations.
1481 //
1482 // s();
1483 // if (p)
1484 // s();
1485 // f();
1486 // s();
1487 // s();
1488 //
1489 // The code will work properly for this case, leaving in the unlock
1490 // before the call to f and the relock after it.
1491 //
1492 // A potentially interesting case which isn't handled here is when the
1493 // locking is partially redundant.
1494 //
1495 // s();
1496 // if (p)
1497 // s();
1498 //
1499 // This could be eliminated putting unlocking on the else case and
1500 // eliminating the first unlock and the lock in the then side.
1501 // Alternatively the unlock could be moved out of the then side so it
1502 // was after the merge and the first unlock and second lock
1503 // eliminated. This might require less manipulation of the memory
1504 // state to get correct.
1505 //
1506 // Additionally we might allow work between a unlock and lock before
1507 // giving up eliminating the locks. The current code disallows any
1508 // conditional control flow between these operations. A formulation
1509 // similar to partial redundancy elimination computing the
1510 // availability of unlocking and the anticipatability of locking at a
1511 // program point would allow detection of fully redundant locking with
1512 // some amount of work in between. I'm not sure how often I really
1513 // think that would occur though. Most of the cases I've seen
1514 // indicate it's likely non-trivial work would occur in between.
1515 // There may be other more complicated constructs where we could
1516 // eliminate locking but I haven't seen any others appear as hot or
1517 // interesting.
1518 //
1519 // Locking and unlocking have a canonical form in ideal that looks
1520 // roughly like this:
1521 //
1522 // <obj>
1523 // | \\------+
1524 // | \ \
1525 // | BoxLock \
1526 // | | | \
1527 // | | \ \
1528 // | | FastLock
1529 // | | /
1530 // | | /
1531 // | | |
1532 //
1533 // Lock
1534 // |
1535 // Proj #0
1536 // |
1537 // MembarAcquire
1538 // |
1539 // Proj #0
1540 //
1541 // MembarRelease
1542 // |
1543 // Proj #0
1544 // |
1545 // Unlock
1546 // |
1547 // Proj #0
1548 //
1549 //
1550 // This code proceeds by processing Lock nodes during PhaseIterGVN
1551 // and searching back through its control for the proper code
1552 // patterns. Once it finds a set of lock and unlock operations to
1553 // eliminate they are marked as eliminatable which causes the
1554 // expansion of the Lock and Unlock macro nodes to make the operation a NOP
1555 //
1556 //=============================================================================
1557
1558 //
1559 // Utility function to skip over uninteresting control nodes. Nodes skipped are:
1560 // - copy regions. (These may not have been optimized away yet.)
1561 // - eliminated locking nodes
1562 //
1563 static Node *next_control(Node *ctrl) {
1564 if (ctrl == NULL)
1565 return NULL;
1566 while (1) {
1567 if (ctrl->is_Region()) {
1568 RegionNode *r = ctrl->as_Region();
1569 Node *n = r->is_copy();
1570 if (n == NULL)
1571 break; // hit a region, return it
1572 else
1573 ctrl = n;
1574 } else if (ctrl->is_Proj()) {
1575 Node *in0 = ctrl->in(0);
1576 if (in0->is_AbstractLock() && in0->as_AbstractLock()->is_eliminated()) {
1577 ctrl = in0->in(0);
1578 } else {
1579 break;
1580 }
1581 } else {
1582 break; // found an interesting control
1583 }
1584 }
1585 return ctrl;
1586 }
1587 //
1588 // Given a control, see if it's the control projection of an Unlock which
1589 // operating on the same object as lock.
1590 //
1591 bool AbstractLockNode::find_matching_unlock(const Node* ctrl, LockNode* lock,
1592 GrowableArray<AbstractLockNode*> &lock_ops) {
1593 ProjNode *ctrl_proj = (ctrl->is_Proj()) ? ctrl->as_Proj() : NULL;
1594 if (ctrl_proj != NULL && ctrl_proj->_con == TypeFunc::Control) {
1595 Node *n = ctrl_proj->in(0);
1596 if (n != NULL && n->is_Unlock()) {
1597 UnlockNode *unlock = n->as_Unlock();
1598 if (lock->obj_node()->eqv_uncast(unlock->obj_node()) &&
1599 BoxLockNode::same_slot(lock->box_node(), unlock->box_node()) &&
1600 !unlock->is_eliminated()) {
1601 lock_ops.append(unlock);
1602 return true;
1603 }
1604 }
1605 }
1606 return false;
1607 }
1608
1609 //
1610 // Find the lock matching an unlock. Returns null if a safepoint
1611 // or complicated control is encountered first.
1612 LockNode *AbstractLockNode::find_matching_lock(UnlockNode* unlock) {
1613 LockNode *lock_result = NULL;
1614 // find the matching lock, or an intervening safepoint
1615 Node *ctrl = next_control(unlock->in(0));
1616 while (1) {
1617 assert(ctrl != NULL, "invalid control graph");
1618 assert(!ctrl->is_Start(), "missing lock for unlock");
1619 if (ctrl->is_top()) break; // dead control path
1620 if (ctrl->is_Proj()) ctrl = ctrl->in(0);
1621 if (ctrl->is_SafePoint()) {
1622 break; // found a safepoint (may be the lock we are searching for)
1623 } else if (ctrl->is_Region()) {
1624 // Check for a simple diamond pattern. Punt on anything more complicated
1625 if (ctrl->req() == 3 && ctrl->in(1) != NULL && ctrl->in(2) != NULL) {
1626 Node *in1 = next_control(ctrl->in(1));
1627 Node *in2 = next_control(ctrl->in(2));
1628 if (((in1->is_IfTrue() && in2->is_IfFalse()) ||
1629 (in2->is_IfTrue() && in1->is_IfFalse())) && (in1->in(0) == in2->in(0))) {
1630 ctrl = next_control(in1->in(0)->in(0));
1631 } else {
1632 break;
1633 }
1634 } else {
1635 break;
1636 }
1637 } else {
1638 ctrl = next_control(ctrl->in(0)); // keep searching
1639 }
1640 }
1641 if (ctrl->is_Lock()) {
1642 LockNode *lock = ctrl->as_Lock();
1643 if (lock->obj_node()->eqv_uncast(unlock->obj_node()) &&
1644 BoxLockNode::same_slot(lock->box_node(), unlock->box_node())) {
1645 lock_result = lock;
1646 }
1647 }
1648 return lock_result;
1649 }
1650
1651 // This code corresponds to case 3 above.
1652
1653 bool AbstractLockNode::find_lock_and_unlock_through_if(Node* node, LockNode* lock,
1654 GrowableArray<AbstractLockNode*> &lock_ops) {
1655 Node* if_node = node->in(0);
1656 bool if_true = node->is_IfTrue();
1657
1658 if (if_node->is_If() && if_node->outcnt() == 2 && (if_true || node->is_IfFalse())) {
1659 Node *lock_ctrl = next_control(if_node->in(0));
1660 if (find_matching_unlock(lock_ctrl, lock, lock_ops)) {
1661 Node* lock1_node = NULL;
1662 ProjNode* proj = if_node->as_If()->proj_out(!if_true);
1663 if (if_true) {
1664 if (proj->is_IfFalse() && proj->outcnt() == 1) {
1665 lock1_node = proj->unique_out();
1666 }
1667 } else {
1668 if (proj->is_IfTrue() && proj->outcnt() == 1) {
1669 lock1_node = proj->unique_out();
1670 }
1671 }
1672 if (lock1_node != NULL && lock1_node->is_Lock()) {
1673 LockNode *lock1 = lock1_node->as_Lock();
1674 if (lock->obj_node()->eqv_uncast(lock1->obj_node()) &&
1675 BoxLockNode::same_slot(lock->box_node(), lock1->box_node()) &&
1676 !lock1->is_eliminated()) {
1677 lock_ops.append(lock1);
1678 return true;
1679 }
1680 }
1681 }
1682 }
1683
1684 lock_ops.trunc_to(0);
1685 return false;
1686 }
1687
1688 bool AbstractLockNode::find_unlocks_for_region(const RegionNode* region, LockNode* lock,
1689 GrowableArray<AbstractLockNode*> &lock_ops) {
1690 // check each control merging at this point for a matching unlock.
1691 // in(0) should be self edge so skip it.
1692 for (int i = 1; i < (int)region->req(); i++) {
1693 Node *in_node = next_control(region->in(i));
1694 if (in_node != NULL) {
1695 if (find_matching_unlock(in_node, lock, lock_ops)) {
1696 // found a match so keep on checking.
1697 continue;
1698 } else if (find_lock_and_unlock_through_if(in_node, lock, lock_ops)) {
1699 continue;
1700 }
1701
1702 // If we fall through to here then it was some kind of node we
1703 // don't understand or there wasn't a matching unlock, so give
1704 // up trying to merge locks.
1705 lock_ops.trunc_to(0);
1706 return false;
1707 }
1708 }
1709 return true;
1710
1711 }
1712
1713 #ifndef PRODUCT
1714 //
1715 // Create a counter which counts the number of times this lock is acquired
1716 //
1717 void AbstractLockNode::create_lock_counter(JVMState* state) {
1718 _counter = OptoRuntime::new_named_counter(state, NamedCounter::LockCounter);
1719 }
1720
1721 void AbstractLockNode::set_eliminated_lock_counter() {
1722 if (_counter) {
1723 // Update the counter to indicate that this lock was eliminated.
1724 // The counter update code will stay around even though the
1725 // optimizer will eliminate the lock operation itself.
1726 _counter->set_tag(NamedCounter::EliminatedLockCounter);
1727 }
1728 }
1729
1730 const char* AbstractLockNode::_kind_names[] = {"Regular", "NonEscObj", "Coarsened", "Nested"};
1731
1732 void AbstractLockNode::dump_spec(outputStream* st) const {
1733 st->print("%s ", _kind_names[_kind]);
1734 CallNode::dump_spec(st);
1735 }
1736
1737 void AbstractLockNode::dump_compact_spec(outputStream* st) const {
1738 st->print("%s", _kind_names[_kind]);
1739 }
1740
1741 // The related set of lock nodes includes the control boundary.
1742 void AbstractLockNode::related(GrowableArray<Node*> *in_rel, GrowableArray<Node*> *out_rel, bool compact) const {
1743 if (compact) {
1744 this->collect_nodes(in_rel, 1, false, false);
1745 } else {
1746 this->collect_nodes_in_all_data(in_rel, true);
1747 }
1748 this->collect_nodes(out_rel, -2, false, false);
1749 }
1750 #endif
1751
1752 //=============================================================================
1753 Node *LockNode::Ideal(PhaseGVN *phase, bool can_reshape) {
1754
1755 // perform any generic optimizations first (returns 'this' or NULL)
1756 Node *result = SafePointNode::Ideal(phase, can_reshape);
1757 if (result != NULL) return result;
1758 // Don't bother trying to transform a dead node
1759 if (in(0) && in(0)->is_top()) return NULL;
1760
1761 // Now see if we can optimize away this lock. We don't actually
1762 // remove the locking here, we simply set the _eliminate flag which
1763 // prevents macro expansion from expanding the lock. Since we don't
1764 // modify the graph, the value returned from this function is the
1765 // one computed above.
1766 if (can_reshape && EliminateLocks && !is_non_esc_obj()) {
1767 //
1768 // If we are locking an unescaped object, the lock/unlock is unnecessary
1769 //
1770 ConnectionGraph *cgr = phase->C->congraph();
1771 if (cgr != NULL && cgr->not_global_escape(obj_node())) {
1772 assert(!is_eliminated() || is_coarsened(), "sanity");
1773 // The lock could be marked eliminated by lock coarsening
1774 // code during first IGVN before EA. Replace coarsened flag
1775 // to eliminate all associated locks/unlocks.
1776 #ifdef ASSERT
1777 this->log_lock_optimization(phase->C,"eliminate_lock_set_non_esc1");
1778 #endif
1779 this->set_non_esc_obj();
1780 return result;
1781 }
1782
1783 //
1784 // Try lock coarsening
1785 //
1786 PhaseIterGVN* iter = phase->is_IterGVN();
1787 if (iter != NULL && !is_eliminated()) {
1788
1789 GrowableArray<AbstractLockNode*> lock_ops;
1790
1791 Node *ctrl = next_control(in(0));
1792
1793 // now search back for a matching Unlock
1794 if (find_matching_unlock(ctrl, this, lock_ops)) {
1795 // found an unlock directly preceding this lock. This is the
1796 // case of single unlock directly control dependent on a
1797 // single lock which is the trivial version of case 1 or 2.
1798 } else if (ctrl->is_Region() ) {
1799 if (find_unlocks_for_region(ctrl->as_Region(), this, lock_ops)) {
1800 // found lock preceded by multiple unlocks along all paths
1801 // joining at this point which is case 3 in description above.
1802 }
1803 } else {
1804 // see if this lock comes from either half of an if and the
1805 // predecessors merges unlocks and the other half of the if
1806 // performs a lock.
1807 if (find_lock_and_unlock_through_if(ctrl, this, lock_ops)) {
1808 // found unlock splitting to an if with locks on both branches.
1809 }
1810 }
1811
1812 if (lock_ops.length() > 0) {
1813 // add ourselves to the list of locks to be eliminated.
1814 lock_ops.append(this);
1815
1816 #ifndef PRODUCT
1817 if (PrintEliminateLocks) {
1818 int locks = 0;
1819 int unlocks = 0;
1820 for (int i = 0; i < lock_ops.length(); i++) {
1821 AbstractLockNode* lock = lock_ops.at(i);
1822 if (lock->Opcode() == Op_Lock)
1823 locks++;
1824 else
1825 unlocks++;
1826 if (Verbose) {
1827 lock->dump(1);
1828 }
1829 }
1830 tty->print_cr("***Eliminated %d unlocks and %d locks", unlocks, locks);
1831 }
1832 #endif
1833
1834 // for each of the identified locks, mark them
1835 // as eliminatable
1836 for (int i = 0; i < lock_ops.length(); i++) {
1837 AbstractLockNode* lock = lock_ops.at(i);
1838
1839 // Mark it eliminated by coarsening and update any counters
1840 #ifdef ASSERT
1841 lock->log_lock_optimization(phase->C, "eliminate_lock_set_coarsened");
1842 #endif
1843 lock->set_coarsened();
1844 }
1845 } else if (ctrl->is_Region() &&
1846 iter->_worklist.member(ctrl)) {
1847 // We weren't able to find any opportunities but the region this
1848 // lock is control dependent on hasn't been processed yet so put
1849 // this lock back on the worklist so we can check again once any
1850 // region simplification has occurred.
1851 iter->_worklist.push(this);
1852 }
1853 }
1854 }
1855
1856 return result;
1857 }
1858
1859 //=============================================================================
1860 bool LockNode::is_nested_lock_region() {
1861 return is_nested_lock_region(NULL);
1862 }
1863
1864 // p is used for access to compilation log; no logging if NULL
1865 bool LockNode::is_nested_lock_region(Compile * c) {
1866 BoxLockNode* box = box_node()->as_BoxLock();
1867 int stk_slot = box->stack_slot();
1868 if (stk_slot <= 0) {
1869 #ifdef ASSERT
1870 this->log_lock_optimization(c, "eliminate_lock_INLR_1");
1871 #endif
1872 return false; // External lock or it is not Box (Phi node).
1873 }
1874
1875 // Ignore complex cases: merged locks or multiple locks.
1876 Node* obj = obj_node();
1877 LockNode* unique_lock = NULL;
1878 if (!box->is_simple_lock_region(&unique_lock, obj)) {
1879 #ifdef ASSERT
1880 this->log_lock_optimization(c, "eliminate_lock_INLR_2a");
1881 #endif
1882 return false;
1883 }
1884 if (unique_lock != this) {
1885 #ifdef ASSERT
1886 this->log_lock_optimization(c, "eliminate_lock_INLR_2b");
1887 #endif
1888 return false;
1889 }
1890
1891 // Look for external lock for the same object.
1892 SafePointNode* sfn = this->as_SafePoint();
1893 JVMState* youngest_jvms = sfn->jvms();
1894 int max_depth = youngest_jvms->depth();
1895 for (int depth = 1; depth <= max_depth; depth++) {
1896 JVMState* jvms = youngest_jvms->of_depth(depth);
1897 int num_mon = jvms->nof_monitors();
1898 // Loop over monitors
1899 for (int idx = 0; idx < num_mon; idx++) {
1900 Node* obj_node = sfn->monitor_obj(jvms, idx);
1901 BoxLockNode* box_node = sfn->monitor_box(jvms, idx)->as_BoxLock();
1902 if ((box_node->stack_slot() < stk_slot) && obj_node->eqv_uncast(obj)) {
1903 return true;
1904 }
1905 }
1906 }
1907 #ifdef ASSERT
1908 this->log_lock_optimization(c, "eliminate_lock_INLR_3");
1909 #endif
1910 return false;
1911 }
1912
1913 //=============================================================================
1914 uint UnlockNode::size_of() const { return sizeof(*this); }
1915
1916 //=============================================================================
1917 Node *UnlockNode::Ideal(PhaseGVN *phase, bool can_reshape) {
1918
1919 // perform any generic optimizations first (returns 'this' or NULL)
1920 Node *result = SafePointNode::Ideal(phase, can_reshape);
1921 if (result != NULL) return result;
1922 // Don't bother trying to transform a dead node
1923 if (in(0) && in(0)->is_top()) return NULL;
1924
1925 // Now see if we can optimize away this unlock. We don't actually
1926 // remove the unlocking here, we simply set the _eliminate flag which
1927 // prevents macro expansion from expanding the unlock. Since we don't
1928 // modify the graph, the value returned from this function is the
1929 // one computed above.
1930 // Escape state is defined after Parse phase.
1931 if (can_reshape && EliminateLocks && !is_non_esc_obj()) {
1932 //
1933 // If we are unlocking an unescaped object, the lock/unlock is unnecessary.
1934 //
1935 ConnectionGraph *cgr = phase->C->congraph();
1936 if (cgr != NULL && cgr->not_global_escape(obj_node())) {
1937 assert(!is_eliminated() || is_coarsened(), "sanity");
1938 // The lock could be marked eliminated by lock coarsening
1939 // code during first IGVN before EA. Replace coarsened flag
1940 // to eliminate all associated locks/unlocks.
1941 #ifdef ASSERT
1942 this->log_lock_optimization(phase->C, "eliminate_lock_set_non_esc2");
1943 #endif
1944 this->set_non_esc_obj();
1945 }
1946 }
1947 return result;
1948 }
1949
1950 const char * AbstractLockNode::kind_as_string() const {
1951 return is_coarsened() ? "coarsened" :
1952 is_nested() ? "nested" :
1953 is_non_esc_obj() ? "non_escaping" :
1954 "?";
1955 }
1956
1957 void AbstractLockNode::log_lock_optimization(Compile *C, const char * tag) const {
1958 if (C == NULL) {
1959 return;
1960 }
1961 CompileLog* log = C->log();
1962 if (log != NULL) {
1963 log->begin_head("%s lock='%d' compile_id='%d' class_id='%s' kind='%s'",
1964 tag, is_Lock(), C->compile_id(),
1965 is_Unlock() ? "unlock" : is_Lock() ? "lock" : "?",
1966 kind_as_string());
1967 log->stamp();
1968 log->end_head();
1969 JVMState* p = is_Unlock() ? (as_Unlock()->dbg_jvms()) : jvms();
1970 while (p != NULL) {
1971 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method()));
1972 p = p->caller();
1973 }
1974 log->tail(tag);
1975 }
1976 }
1977
1978 bool CallNode::may_modify_arraycopy_helper(const TypeOopPtr* dest_t, const TypeOopPtr *t_oop, PhaseTransform *phase) {
1979 if (dest_t->is_known_instance() && t_oop->is_known_instance()) {
1980 return dest_t->instance_id() == t_oop->instance_id();
1981 }
1982
1983 if (dest_t->isa_instptr() && !dest_t->klass()->equals(phase->C->env()->Object_klass())) {
1984 // clone
1985 if (t_oop->isa_aryptr()) {
1986 return false;
1987 }
1988 if (!t_oop->isa_instptr()) {
1989 return true;
1990 }
1991 if (dest_t->klass()->is_subtype_of(t_oop->klass()) || t_oop->klass()->is_subtype_of(dest_t->klass())) {
1992 return true;
1993 }
1994 // unrelated
1995 return false;
1996 }
1997
1998 if (dest_t->isa_aryptr()) {
1999 // arraycopy or array clone
2000 if (t_oop->isa_instptr()) {
2001 return false;
2002 }
2003 if (!t_oop->isa_aryptr()) {
2004 return true;
2005 }
2006
2007 const Type* elem = dest_t->is_aryptr()->elem();
2008 if (elem == Type::BOTTOM) {
2009 // An array but we don't know what elements are
2010 return true;
2011 }
2012
2013 dest_t = dest_t->add_offset(Type::OffsetBot)->is_oopptr();
2014 uint dest_alias = phase->C->get_alias_index(dest_t);
2015 uint t_oop_alias = phase->C->get_alias_index(t_oop);
2016
2017 return dest_alias == t_oop_alias;
2018 }
2019
2020 return true;
2021 }
2022