1 /*
2 * Copyright (c) 1997, 2025, 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 "compiler/compileLog.hpp"
26 #include "ci/ciFlatArrayKlass.hpp"
27 #include "ci/bcEscapeAnalyzer.hpp"
28 #include "compiler/oopMap.hpp"
29 #include "gc/shared/barrierSet.hpp"
30 #include "gc/shared/c2/barrierSetC2.hpp"
31 #include "interpreter/interpreter.hpp"
32 #include "opto/callGenerator.hpp"
33 #include "opto/callnode.hpp"
34 #include "opto/castnode.hpp"
35 #include "opto/convertnode.hpp"
36 #include "opto/escape.hpp"
37 #include "opto/inlinetypenode.hpp"
38 #include "opto/locknode.hpp"
39 #include "opto/machnode.hpp"
40 #include "opto/matcher.hpp"
41 #include "opto/parse.hpp"
42 #include "opto/regalloc.hpp"
43 #include "opto/regmask.hpp"
44 #include "opto/rootnode.hpp"
45 #include "opto/runtime.hpp"
46 #include "runtime/sharedRuntime.hpp"
47 #include "runtime/stubRoutines.hpp"
48 #include "utilities/powerOfTwo.hpp"
49 #include "code/vmreg.hpp"
50
51 // Portions of code courtesy of Clifford Click
52
53 // Optimization - Graph Style
54
55 //=============================================================================
56 uint StartNode::size_of() const { return sizeof(*this); }
57 bool StartNode::cmp( const Node &n ) const
58 { return _domain == ((StartNode&)n)._domain; }
59 const Type *StartNode::bottom_type() const { return _domain; }
60 const Type* StartNode::Value(PhaseGVN* phase) const { return _domain; }
61 #ifndef PRODUCT
62 void StartNode::dump_spec(outputStream *st) const { st->print(" #"); _domain->dump_on(st);}
63 void StartNode::dump_compact_spec(outputStream *st) const { /* empty */ }
64 #endif
65
66 //------------------------------Ideal------------------------------------------
67 Node *StartNode::Ideal(PhaseGVN *phase, bool can_reshape){
68 return remove_dead_region(phase, can_reshape) ? this : nullptr;
69 }
70
71 //------------------------------calling_convention-----------------------------
72 void StartNode::calling_convention(BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt) const {
73 SharedRuntime::java_calling_convention(sig_bt, parm_regs, argcnt);
74 }
75
76 //------------------------------Registers--------------------------------------
77 const RegMask &StartNode::in_RegMask(uint) const {
78 return RegMask::Empty;
79 }
80
81 //------------------------------match------------------------------------------
82 // Construct projections for incoming parameters, and their RegMask info
83 Node *StartNode::match(const ProjNode *proj, const Matcher *match, const RegMask* mask) {
84 switch (proj->_con) {
85 case TypeFunc::Control:
86 case TypeFunc::I_O:
87 case TypeFunc::Memory:
88 return new MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj);
89 case TypeFunc::FramePtr:
90 return new MachProjNode(this,proj->_con,Matcher::c_frame_ptr_mask, Op_RegP);
91 case TypeFunc::ReturnAdr:
92 return new MachProjNode(this,proj->_con,match->_return_addr_mask,Op_RegP);
93 case TypeFunc::Parms:
94 default: {
95 uint parm_num = proj->_con - TypeFunc::Parms;
96 const Type *t = _domain->field_at(proj->_con);
97 if (t->base() == Type::Half) // 2nd half of Longs and Doubles
98 return new ConNode(Type::TOP);
99 uint ideal_reg = t->ideal_reg();
100 RegMask &rm = match->_calling_convention_mask[parm_num];
101 return new MachProjNode(this,proj->_con,rm,ideal_reg);
102 }
103 }
104 return nullptr;
105 }
106
107 //=============================================================================
108 const char * const ParmNode::names[TypeFunc::Parms+1] = {
109 "Control", "I_O", "Memory", "FramePtr", "ReturnAdr", "Parms"
110 };
111
112 #ifndef PRODUCT
113 void ParmNode::dump_spec(outputStream *st) const {
114 if( _con < TypeFunc::Parms ) {
115 st->print("%s", names[_con]);
116 } else {
117 st->print("Parm%d: ",_con-TypeFunc::Parms);
118 // Verbose and WizardMode dump bottom_type for all nodes
119 if( !Verbose && !WizardMode ) bottom_type()->dump_on(st);
120 }
121 }
122
123 void ParmNode::dump_compact_spec(outputStream *st) const {
124 if (_con < TypeFunc::Parms) {
125 st->print("%s", names[_con]);
126 } else {
127 st->print("%d:", _con-TypeFunc::Parms);
128 // unconditionally dump bottom_type
129 bottom_type()->dump_on(st);
130 }
131 }
132 #endif
133
134 uint ParmNode::ideal_reg() const {
135 switch( _con ) {
136 case TypeFunc::Control : // fall through
137 case TypeFunc::I_O : // fall through
138 case TypeFunc::Memory : return 0;
139 case TypeFunc::FramePtr : // fall through
140 case TypeFunc::ReturnAdr: return Op_RegP;
141 default : assert( _con > TypeFunc::Parms, "" );
142 // fall through
143 case TypeFunc::Parms : {
144 // Type of argument being passed
145 const Type *t = in(0)->as_Start()->_domain->field_at(_con);
146 return t->ideal_reg();
147 }
148 }
149 ShouldNotReachHere();
150 return 0;
151 }
152
153 //=============================================================================
154 ReturnNode::ReturnNode(uint edges, Node *cntrl, Node *i_o, Node *memory, Node *frameptr, Node *retadr ) : Node(edges) {
155 init_req(TypeFunc::Control,cntrl);
156 init_req(TypeFunc::I_O,i_o);
157 init_req(TypeFunc::Memory,memory);
158 init_req(TypeFunc::FramePtr,frameptr);
159 init_req(TypeFunc::ReturnAdr,retadr);
160 }
161
162 Node *ReturnNode::Ideal(PhaseGVN *phase, bool can_reshape){
163 return remove_dead_region(phase, can_reshape) ? this : nullptr;
164 }
165
166 const Type* ReturnNode::Value(PhaseGVN* phase) const {
167 return ( phase->type(in(TypeFunc::Control)) == Type::TOP)
168 ? Type::TOP
169 : Type::BOTTOM;
170 }
171
172 // Do we Match on this edge index or not? No edges on return nodes
173 uint ReturnNode::match_edge(uint idx) const {
174 return 0;
175 }
176
177
178 #ifndef PRODUCT
179 void ReturnNode::dump_req(outputStream *st, DumpConfig* dc) const {
180 // Dump the required inputs, after printing "returns"
181 uint i; // Exit value of loop
182 for (i = 0; i < req(); i++) { // For all required inputs
183 if (i == TypeFunc::Parms) st->print("returns ");
184 Node* p = in(i);
185 if (p != nullptr) {
186 p->dump_idx(false, st, dc);
187 st->print(" ");
188 } else {
189 st->print("_ ");
190 }
191 }
192 }
193 #endif
194
195 //=============================================================================
196 RethrowNode::RethrowNode(
197 Node* cntrl,
198 Node* i_o,
199 Node* memory,
200 Node* frameptr,
201 Node* ret_adr,
202 Node* exception
203 ) : Node(TypeFunc::Parms + 1) {
204 init_req(TypeFunc::Control , cntrl );
205 init_req(TypeFunc::I_O , i_o );
206 init_req(TypeFunc::Memory , memory );
207 init_req(TypeFunc::FramePtr , frameptr );
208 init_req(TypeFunc::ReturnAdr, ret_adr);
209 init_req(TypeFunc::Parms , exception);
210 }
211
212 Node *RethrowNode::Ideal(PhaseGVN *phase, bool can_reshape){
213 return remove_dead_region(phase, can_reshape) ? this : nullptr;
214 }
215
216 const Type* RethrowNode::Value(PhaseGVN* phase) const {
217 return (phase->type(in(TypeFunc::Control)) == Type::TOP)
218 ? Type::TOP
219 : Type::BOTTOM;
220 }
221
222 uint RethrowNode::match_edge(uint idx) const {
223 return 0;
224 }
225
226 #ifndef PRODUCT
227 void RethrowNode::dump_req(outputStream *st, DumpConfig* dc) const {
228 // Dump the required inputs, after printing "exception"
229 uint i; // Exit value of loop
230 for (i = 0; i < req(); i++) { // For all required inputs
231 if (i == TypeFunc::Parms) st->print("exception ");
232 Node* p = in(i);
233 if (p != nullptr) {
234 p->dump_idx(false, st, dc);
235 st->print(" ");
236 } else {
237 st->print("_ ");
238 }
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 != nullptr, "must be valid call site");
259 _bci = InvocationEntryBci;
260 _reexecute = Reexecute_Undefined;
261 debug_only(_bci = -99); // random garbage value
262 debug_only(_map = (SafePointNode*)-1);
263 _caller = caller;
264 _depth = 1 + (caller == nullptr ? 0 : caller->depth());
265 _locoff = TypeFunc::Parms;
266 _stkoff = _locoff + _method->max_locals();
267 _monoff = _stkoff + _method->max_stack();
268 _scloff = _monoff;
269 _endoff = _monoff;
270 _sp = 0;
271 }
272 JVMState::JVMState(int stack_size) :
273 _method(nullptr) {
274 _bci = InvocationEntryBci;
275 _reexecute = Reexecute_Undefined;
276 debug_only(_map = (SafePointNode*)-1);
277 _caller = nullptr;
278 _depth = 1;
279 _locoff = TypeFunc::Parms;
280 _stkoff = _locoff;
281 _monoff = _stkoff + stack_size;
282 _scloff = _monoff;
283 _endoff = _monoff;
284 _sp = 0;
285 }
286
287 //--------------------------------of_depth-------------------------------------
288 JVMState* JVMState::of_depth(int d) const {
289 const JVMState* jvmp = this;
290 assert(0 < d && (uint)d <= depth(), "oob");
291 for (int skip = depth() - d; skip > 0; skip--) {
292 jvmp = jvmp->caller();
293 }
294 assert(jvmp->depth() == (uint)d, "found the right one");
295 return (JVMState*)jvmp;
296 }
297
298 //-----------------------------same_calls_as-----------------------------------
299 bool JVMState::same_calls_as(const JVMState* that) const {
300 if (this == that) return true;
301 if (this->depth() != that->depth()) return false;
302 const JVMState* p = this;
303 const JVMState* q = that;
304 for (;;) {
305 if (p->_method != q->_method) return false;
306 if (p->_method == nullptr) return true; // bci is irrelevant
307 if (p->_bci != q->_bci) return false;
308 if (p->_reexecute != q->_reexecute) return false;
309 p = p->caller();
310 q = q->caller();
311 if (p == q) return true;
312 assert(p != nullptr && q != nullptr, "depth check ensures we don't run off end");
313 }
314 }
315
316 //------------------------------debug_start------------------------------------
317 uint JVMState::debug_start() const {
318 debug_only(JVMState* jvmroot = of_depth(1));
319 assert(jvmroot->locoff() <= this->locoff(), "youngest JVMState must be last");
320 return of_depth(1)->locoff();
321 }
322
323 //-------------------------------debug_end-------------------------------------
324 uint JVMState::debug_end() const {
325 debug_only(JVMState* jvmroot = of_depth(1));
326 assert(jvmroot->endoff() <= this->endoff(), "youngest JVMState must be last");
327 return endoff();
328 }
329
330 //------------------------------debug_depth------------------------------------
331 uint JVMState::debug_depth() const {
332 uint total = 0;
333 for (const JVMState* jvmp = this; jvmp != nullptr; jvmp = jvmp->caller()) {
334 total += jvmp->debug_size();
335 }
336 return total;
337 }
338
339 #ifndef PRODUCT
340
341 //------------------------------format_helper----------------------------------
342 // Given an allocation (a Chaitin object) and a Node decide if the Node carries
343 // any defined value or not. If it does, print out the register or constant.
344 static void format_helper( PhaseRegAlloc *regalloc, outputStream* st, Node *n, const char *msg, uint i, GrowableArray<SafePointScalarObjectNode*> *scobjs ) {
345 if (n == nullptr) { st->print(" null"); return; }
346 if (n->is_SafePointScalarObject()) {
347 // Scalar replacement.
348 SafePointScalarObjectNode* spobj = n->as_SafePointScalarObject();
349 scobjs->append_if_missing(spobj);
350 int sco_n = scobjs->find(spobj);
351 assert(sco_n >= 0, "");
352 st->print(" %s%d]=#ScObj" INT32_FORMAT, msg, i, sco_n);
353 return;
354 }
355 if (regalloc->node_regs_max_index() > 0 &&
356 OptoReg::is_valid(regalloc->get_reg_first(n))) { // Check for undefined
357 char buf[50];
358 regalloc->dump_register(n,buf,sizeof(buf));
359 st->print(" %s%d]=%s",msg,i,buf);
360 } else { // No register, but might be constant
361 const Type *t = n->bottom_type();
362 switch (t->base()) {
363 case Type::Int:
364 st->print(" %s%d]=#" INT32_FORMAT,msg,i,t->is_int()->get_con());
365 break;
366 case Type::AnyPtr:
367 assert( t == TypePtr::NULL_PTR || n->in_dump(), "" );
368 st->print(" %s%d]=#null",msg,i);
369 break;
370 case Type::AryPtr:
371 case Type::InstPtr:
372 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,p2i(t->isa_oopptr()->const_oop()));
373 break;
374 case Type::KlassPtr:
375 case Type::AryKlassPtr:
376 case Type::InstKlassPtr:
377 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,p2i(t->make_ptr()->isa_klassptr()->exact_klass()));
378 break;
379 case Type::MetadataPtr:
380 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,p2i(t->make_ptr()->isa_metadataptr()->metadata()));
381 break;
382 case Type::NarrowOop:
383 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,p2i(t->make_ptr()->isa_oopptr()->const_oop()));
384 break;
385 case Type::RawPtr:
386 st->print(" %s%d]=#Raw" INTPTR_FORMAT,msg,i,p2i(t->is_rawptr()));
387 break;
388 case Type::DoubleCon:
389 st->print(" %s%d]=#%fD",msg,i,t->is_double_constant()->_d);
390 break;
391 case Type::FloatCon:
392 st->print(" %s%d]=#%fF",msg,i,t->is_float_constant()->_f);
393 break;
394 case Type::Long:
395 st->print(" %s%d]=#" INT64_FORMAT,msg,i,(int64_t)(t->is_long()->get_con()));
396 break;
397 case Type::Half:
398 case Type::Top:
399 st->print(" %s%d]=_",msg,i);
400 break;
401 default: ShouldNotReachHere();
402 }
403 }
404 }
405
406 //---------------------print_method_with_lineno--------------------------------
407 void JVMState::print_method_with_lineno(outputStream* st, bool show_name) const {
408 if (show_name) _method->print_short_name(st);
409
410 int lineno = _method->line_number_from_bci(_bci);
411 if (lineno != -1) {
412 st->print(" @ bci:%d (line %d)", _bci, lineno);
413 } else {
414 st->print(" @ bci:%d", _bci);
415 }
416 }
417
418 //------------------------------format-----------------------------------------
419 void JVMState::format(PhaseRegAlloc *regalloc, const Node *n, outputStream* st) const {
420 st->print(" #");
421 if (_method) {
422 print_method_with_lineno(st, true);
423 } else {
424 st->print_cr(" runtime stub ");
425 return;
426 }
427 if (n->is_MachSafePoint()) {
428 GrowableArray<SafePointScalarObjectNode*> scobjs;
429 MachSafePointNode *mcall = n->as_MachSafePoint();
430 uint i;
431 // Print locals
432 for (i = 0; i < (uint)loc_size(); i++)
433 format_helper(regalloc, st, mcall->local(this, i), "L[", i, &scobjs);
434 // Print stack
435 for (i = 0; i < (uint)stk_size(); i++) {
436 if ((uint)(_stkoff + i) >= mcall->len())
437 st->print(" oob ");
438 else
439 format_helper(regalloc, st, mcall->stack(this, i), "STK[", i, &scobjs);
440 }
441 for (i = 0; (int)i < nof_monitors(); i++) {
442 Node *box = mcall->monitor_box(this, i);
443 Node *obj = mcall->monitor_obj(this, i);
444 if (regalloc->node_regs_max_index() > 0 &&
445 OptoReg::is_valid(regalloc->get_reg_first(box))) {
446 box = BoxLockNode::box_node(box);
447 format_helper(regalloc, st, box, "MON-BOX[", i, &scobjs);
448 } else {
449 OptoReg::Name box_reg = BoxLockNode::reg(box);
450 st->print(" MON-BOX%d=%s+%d",
451 i,
452 OptoReg::regname(OptoReg::c_frame_pointer),
453 regalloc->reg2offset(box_reg));
454 }
455 const char* obj_msg = "MON-OBJ[";
456 if (EliminateLocks) {
457 if (BoxLockNode::box_node(box)->is_eliminated())
458 obj_msg = "MON-OBJ(LOCK ELIMINATED)[";
459 }
460 format_helper(regalloc, st, obj, obj_msg, i, &scobjs);
461 }
462
463 for (i = 0; i < (uint)scobjs.length(); i++) {
464 // Scalar replaced objects.
465 st->cr();
466 st->print(" # ScObj" INT32_FORMAT " ", i);
467 SafePointScalarObjectNode* spobj = scobjs.at(i);
468 ciKlass* cik = spobj->bottom_type()->is_oopptr()->exact_klass();
469 assert(cik->is_instance_klass() ||
470 cik->is_array_klass(), "Not supported allocation.");
471 ciInstanceKlass *iklass = nullptr;
472 if (cik->is_instance_klass()) {
473 cik->print_name_on(st);
474 iklass = cik->as_instance_klass();
475 } else if (cik->is_type_array_klass()) {
476 cik->as_array_klass()->base_element_type()->print_name_on(st);
477 st->print("[%d]", spobj->n_fields());
478 } else if (cik->is_obj_array_klass()) {
479 ciKlass* cie = cik->as_obj_array_klass()->base_element_klass();
480 if (cie->is_instance_klass()) {
481 cie->print_name_on(st);
482 } else if (cie->is_type_array_klass()) {
483 cie->as_array_klass()->base_element_type()->print_name_on(st);
484 } else {
485 ShouldNotReachHere();
486 }
487 st->print("[%d]", spobj->n_fields());
488 int ndim = cik->as_array_klass()->dimension() - 1;
489 while (ndim-- > 0) {
490 st->print("[]");
491 }
492 } else if (cik->is_flat_array_klass()) {
493 ciKlass* cie = cik->as_flat_array_klass()->base_element_klass();
494 cie->print_name_on(st);
495 st->print("[%d]", spobj->n_fields());
496 int ndim = cik->as_array_klass()->dimension() - 1;
497 while (ndim-- > 0) {
498 st->print("[]");
499 }
500 }
501 st->print("={");
502 uint nf = spobj->n_fields();
503 if (nf > 0) {
504 uint first_ind = spobj->first_index(mcall->jvms());
505 if (iklass != nullptr && iklass->is_inlinetype()) {
506 Node* init_node = mcall->in(first_ind++);
507 if (!init_node->is_top()) {
508 st->print(" [is_init");
509 format_helper(regalloc, st, init_node, ":", -1, nullptr);
510 }
511 }
512 Node* fld_node = mcall->in(first_ind);
513 if (iklass != nullptr) {
514 st->print(" [");
515 iklass->nonstatic_field_at(0)->print_name_on(st);
516 format_helper(regalloc, st, fld_node, ":", 0, &scobjs);
517 } else {
518 format_helper(regalloc, st, fld_node, "[", 0, &scobjs);
519 }
520 for (uint j = 1; j < nf; j++) {
521 fld_node = mcall->in(first_ind+j);
522 if (iklass != nullptr) {
523 st->print(", [");
524 iklass->nonstatic_field_at(j)->print_name_on(st);
525 format_helper(regalloc, st, fld_node, ":", j, &scobjs);
526 } else {
527 format_helper(regalloc, st, fld_node, ", [", j, &scobjs);
528 }
529 }
530 }
531 st->print(" }");
532 }
533 }
534 st->cr();
535 if (caller() != nullptr) caller()->format(regalloc, n, st);
536 }
537
538
539 void JVMState::dump_spec(outputStream *st) const {
540 if (_method != nullptr) {
541 bool printed = false;
542 if (!Verbose) {
543 // The JVMS dumps make really, really long lines.
544 // Take out the most boring parts, which are the package prefixes.
545 char buf[500];
546 stringStream namest(buf, sizeof(buf));
547 _method->print_short_name(&namest);
548 if (namest.count() < sizeof(buf)) {
549 const char* name = namest.base();
550 if (name[0] == ' ') ++name;
551 const char* endcn = strchr(name, ':'); // end of class name
552 if (endcn == nullptr) endcn = strchr(name, '(');
553 if (endcn == nullptr) endcn = name + strlen(name);
554 while (endcn > name && endcn[-1] != '.' && endcn[-1] != '/')
555 --endcn;
556 st->print(" %s", endcn);
557 printed = true;
558 }
559 }
560 print_method_with_lineno(st, !printed);
561 if(_reexecute == Reexecute_True)
562 st->print(" reexecute");
563 } else {
564 st->print(" runtime stub");
565 }
566 if (caller() != nullptr) caller()->dump_spec(st);
567 }
568
569
570 void JVMState::dump_on(outputStream* st) const {
571 bool print_map = _map && !((uintptr_t)_map & 1) &&
572 ((caller() == nullptr) || (caller()->map() != _map));
573 if (print_map) {
574 if (_map->len() > _map->req()) { // _map->has_exceptions()
575 Node* ex = _map->in(_map->req()); // _map->next_exception()
576 // skip the first one; it's already being printed
577 while (ex != nullptr && ex->len() > ex->req()) {
578 ex = ex->in(ex->req()); // ex->next_exception()
579 ex->dump(1);
580 }
581 }
582 _map->dump(Verbose ? 2 : 1);
583 }
584 if (caller() != nullptr) {
585 caller()->dump_on(st);
586 }
587 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=",
588 depth(), locoff(), stkoff(), argoff(), monoff(), scloff(), endoff(), monitor_depth(), sp(), bci(), should_reexecute()?"true":"false");
589 if (_method == nullptr) {
590 st->print_cr("(none)");
591 } else {
592 _method->print_name(st);
593 st->cr();
594 if (bci() >= 0 && bci() < _method->code_size()) {
595 st->print(" bc: ");
596 _method->print_codes_on(bci(), bci()+1, st);
597 }
598 }
599 }
600
601 // Extra way to dump a jvms from the debugger,
602 // to avoid a bug with C++ member function calls.
603 void dump_jvms(JVMState* jvms) {
604 jvms->dump();
605 }
606 #endif
607
608 //--------------------------clone_shallow--------------------------------------
609 JVMState* JVMState::clone_shallow(Compile* C) const {
610 JVMState* n = has_method() ? new (C) JVMState(_method, _caller) : new (C) JVMState(0);
611 n->set_bci(_bci);
612 n->_reexecute = _reexecute;
613 n->set_locoff(_locoff);
614 n->set_stkoff(_stkoff);
615 n->set_monoff(_monoff);
616 n->set_scloff(_scloff);
617 n->set_endoff(_endoff);
618 n->set_sp(_sp);
619 n->set_map(_map);
620 return n;
621 }
622
623 //---------------------------clone_deep----------------------------------------
624 JVMState* JVMState::clone_deep(Compile* C) const {
625 JVMState* n = clone_shallow(C);
626 for (JVMState* p = n; p->_caller != nullptr; p = p->_caller) {
627 p->_caller = p->_caller->clone_shallow(C);
628 }
629 assert(n->depth() == depth(), "sanity");
630 assert(n->debug_depth() == debug_depth(), "sanity");
631 return n;
632 }
633
634 /**
635 * Reset map for all callers
636 */
637 void JVMState::set_map_deep(SafePointNode* map) {
638 for (JVMState* p = this; p != nullptr; p = p->_caller) {
639 p->set_map(map);
640 }
641 }
642
643 // unlike set_map(), this is two-way setting.
644 void JVMState::bind_map(SafePointNode* map) {
645 set_map(map);
646 _map->set_jvms(this);
647 }
648
649 // Adapt offsets in in-array after adding or removing an edge.
650 // Prerequisite is that the JVMState is used by only one node.
651 void JVMState::adapt_position(int delta) {
652 for (JVMState* jvms = this; jvms != nullptr; jvms = jvms->caller()) {
653 jvms->set_locoff(jvms->locoff() + delta);
654 jvms->set_stkoff(jvms->stkoff() + delta);
655 jvms->set_monoff(jvms->monoff() + delta);
656 jvms->set_scloff(jvms->scloff() + delta);
657 jvms->set_endoff(jvms->endoff() + delta);
658 }
659 }
660
661 // Mirror the stack size calculation in the deopt code
662 // How much stack space would we need at this point in the program in
663 // case of deoptimization?
664 int JVMState::interpreter_frame_size() const {
665 const JVMState* jvms = this;
666 int size = 0;
667 int callee_parameters = 0;
668 int callee_locals = 0;
669 int extra_args = method()->max_stack() - stk_size();
670
671 while (jvms != nullptr) {
672 int locks = jvms->nof_monitors();
673 int temps = jvms->stk_size();
674 bool is_top_frame = (jvms == this);
675 ciMethod* method = jvms->method();
676
677 int frame_size = BytesPerWord * Interpreter::size_activation(method->max_stack(),
678 temps + callee_parameters,
679 extra_args,
680 locks,
681 callee_parameters,
682 callee_locals,
683 is_top_frame);
684 size += frame_size;
685
686 callee_parameters = method->size_of_parameters();
687 callee_locals = method->max_locals();
688 extra_args = 0;
689 jvms = jvms->caller();
690 }
691 return size + Deoptimization::last_frame_adjust(0, callee_locals) * BytesPerWord;
692 }
693
694 //=============================================================================
695 bool CallNode::cmp( const Node &n ) const
696 { return _tf == ((CallNode&)n)._tf && _jvms == ((CallNode&)n)._jvms; }
697 #ifndef PRODUCT
698 void CallNode::dump_req(outputStream *st, DumpConfig* dc) const {
699 // Dump the required inputs, enclosed in '(' and ')'
700 uint i; // Exit value of loop
701 for (i = 0; i < req(); i++) { // For all required inputs
702 if (i == TypeFunc::Parms) st->print("(");
703 Node* p = in(i);
704 if (p != nullptr) {
705 p->dump_idx(false, st, dc);
706 st->print(" ");
707 } else {
708 st->print("_ ");
709 }
710 }
711 st->print(")");
712 }
713
714 void CallNode::dump_spec(outputStream *st) const {
715 st->print(" ");
716 if (tf() != nullptr) tf()->dump_on(st);
717 if (_cnt != COUNT_UNKNOWN) st->print(" C=%f",_cnt);
718 if (jvms() != nullptr) jvms()->dump_spec(st);
719 }
720
721 void AllocateNode::dump_spec(outputStream* st) const {
722 st->print(" ");
723 if (tf() != nullptr) {
724 tf()->dump_on(st);
725 }
726 if (_cnt != COUNT_UNKNOWN) {
727 st->print(" C=%f", _cnt);
728 }
729 const Node* const klass_node = in(KlassNode);
730 if (klass_node != nullptr) {
731 const TypeKlassPtr* const klass_ptr = klass_node->bottom_type()->isa_klassptr();
732
733 if (klass_ptr != nullptr && klass_ptr->klass_is_exact()) {
734 st->print(" allocationKlass:");
735 klass_ptr->exact_klass()->print_name_on(st);
736 }
737 }
738 if (jvms() != nullptr) {
739 jvms()->dump_spec(st);
740 }
741 }
742 #endif
743
744 const Type *CallNode::bottom_type() const { return tf()->range_cc(); }
745 const Type* CallNode::Value(PhaseGVN* phase) const {
746 if (in(0) == nullptr || phase->type(in(0)) == Type::TOP) {
747 return Type::TOP;
748 }
749 return tf()->range_cc();
750 }
751
752 //------------------------------calling_convention-----------------------------
753 void CallNode::calling_convention(BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt) const {
754 if (_entry_point == StubRoutines::store_inline_type_fields_to_buf()) {
755 // The call to that stub is a special case: its inputs are
756 // multiple values returned from a call and so it should follow
757 // the return convention.
758 SharedRuntime::java_return_convention(sig_bt, parm_regs, argcnt);
759 return;
760 }
761 // Use the standard compiler calling convention
762 SharedRuntime::java_calling_convention(sig_bt, parm_regs, argcnt);
763 }
764
765
766 //------------------------------match------------------------------------------
767 // Construct projections for control, I/O, memory-fields, ..., and
768 // return result(s) along with their RegMask info
769 Node *CallNode::match(const ProjNode *proj, const Matcher *match, const RegMask* mask) {
770 uint con = proj->_con;
771 const TypeTuple* range_cc = tf()->range_cc();
772 if (con >= TypeFunc::Parms) {
773 if (tf()->returns_inline_type_as_fields()) {
774 // The call returns multiple values (inline type fields): we
775 // create one projection per returned value.
776 assert(con <= TypeFunc::Parms+1 || InlineTypeReturnedAsFields, "only for multi value return");
777 uint ideal_reg = range_cc->field_at(con)->ideal_reg();
778 return new MachProjNode(this, con, mask[con-TypeFunc::Parms], ideal_reg);
779 } else {
780 if (con == TypeFunc::Parms) {
781 uint ideal_reg = range_cc->field_at(TypeFunc::Parms)->ideal_reg();
782 OptoRegPair regs = Opcode() == Op_CallLeafVector
783 ? match->vector_return_value(ideal_reg) // Calls into assembly vector routine
784 : match->c_return_value(ideal_reg);
785 RegMask rm = RegMask(regs.first());
786
787 if (Opcode() == Op_CallLeafVector) {
788 // If the return is in vector, compute appropriate regmask taking into account the whole range
789 if(ideal_reg >= Op_VecA && ideal_reg <= Op_VecZ) {
790 if(OptoReg::is_valid(regs.second())) {
791 for (OptoReg::Name r = regs.first(); r <= regs.second(); r = OptoReg::add(r, 1)) {
792 rm.Insert(r);
793 }
794 }
795 }
796 }
797
798 if (OptoReg::is_valid(regs.second())) {
799 rm.Insert(regs.second());
800 }
801 return new MachProjNode(this,con,rm,ideal_reg);
802 } else {
803 assert(con == TypeFunc::Parms+1, "only one return value");
804 assert(range_cc->field_at(TypeFunc::Parms+1) == Type::HALF, "");
805 return new MachProjNode(this,con, RegMask::Empty, (uint)OptoReg::Bad);
806 }
807 }
808 }
809
810 switch (con) {
811 case TypeFunc::Control:
812 case TypeFunc::I_O:
813 case TypeFunc::Memory:
814 return new MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj);
815
816 case TypeFunc::ReturnAdr:
817 case TypeFunc::FramePtr:
818 default:
819 ShouldNotReachHere();
820 }
821 return nullptr;
822 }
823
824 // Do we Match on this edge index or not? Match no edges
825 uint CallNode::match_edge(uint idx) const {
826 return 0;
827 }
828
829 //
830 // Determine whether the call could modify the field of the specified
831 // instance at the specified offset.
832 //
833 bool CallNode::may_modify(const TypeOopPtr* t_oop, PhaseValues* phase) {
834 assert((t_oop != nullptr), "sanity");
835 if (is_call_to_arraycopystub() && strcmp(_name, "unsafe_arraycopy") != 0) {
836 const TypeTuple* args = _tf->domain_sig();
837 Node* dest = nullptr;
838 // Stubs that can be called once an ArrayCopyNode is expanded have
839 // different signatures. Look for the second pointer argument,
840 // that is the destination of the copy.
841 for (uint i = TypeFunc::Parms, j = 0; i < args->cnt(); i++) {
842 if (args->field_at(i)->isa_ptr()) {
843 j++;
844 if (j == 2) {
845 dest = in(i);
846 break;
847 }
848 }
849 }
850 guarantee(dest != nullptr, "Call had only one ptr in, broken IR!");
851 if (!dest->is_top() && may_modify_arraycopy_helper(phase->type(dest)->is_oopptr(), t_oop, phase)) {
852 return true;
853 }
854 return false;
855 }
856 if (t_oop->is_known_instance()) {
857 // The instance_id is set only for scalar-replaceable allocations which
858 // are not passed as arguments according to Escape Analysis.
859 return false;
860 }
861 if (t_oop->is_ptr_to_boxed_value()) {
862 ciKlass* boxing_klass = t_oop->is_instptr()->instance_klass();
863 if (is_CallStaticJava() && as_CallStaticJava()->is_boxing_method()) {
864 // Skip unrelated boxing methods.
865 Node* proj = proj_out_or_null(TypeFunc::Parms);
866 if ((proj == nullptr) || (phase->type(proj)->is_instptr()->instance_klass() != boxing_klass)) {
867 return false;
868 }
869 }
870 if (is_CallJava() && as_CallJava()->method() != nullptr) {
871 ciMethod* meth = as_CallJava()->method();
872 if (meth->is_getter()) {
873 return false;
874 }
875 // May modify (by reflection) if an boxing object is passed
876 // as argument or returned.
877 Node* proj = returns_pointer() ? proj_out_or_null(TypeFunc::Parms) : nullptr;
878 if (proj != nullptr) {
879 const TypeInstPtr* inst_t = phase->type(proj)->isa_instptr();
880 if ((inst_t != nullptr) && (!inst_t->klass_is_exact() ||
881 (inst_t->instance_klass() == boxing_klass))) {
882 return true;
883 }
884 }
885 const TypeTuple* d = tf()->domain_cc();
886 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) {
887 const TypeInstPtr* inst_t = d->field_at(i)->isa_instptr();
888 if ((inst_t != nullptr) && (!inst_t->klass_is_exact() ||
889 (inst_t->instance_klass() == boxing_klass))) {
890 return true;
891 }
892 }
893 return false;
894 }
895 }
896 return true;
897 }
898
899 // Does this call have a direct reference to n other than debug information?
900 bool CallNode::has_non_debug_use(Node* n) {
901 const TypeTuple* d = tf()->domain_cc();
902 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) {
903 if (in(i) == n) {
904 return true;
905 }
906 }
907 return false;
908 }
909
910 bool CallNode::has_debug_use(Node* n) {
911 if (jvms() != nullptr) {
912 for (uint i = jvms()->debug_start(); i < jvms()->debug_end(); i++) {
913 if (in(i) == n) {
914 return true;
915 }
916 }
917 }
918 return false;
919 }
920
921 // Returns the unique CheckCastPP of a call
922 // or 'this' if there are several CheckCastPP or unexpected uses
923 // or returns null if there is no one.
924 Node *CallNode::result_cast() {
925 Node *cast = nullptr;
926
927 Node *p = proj_out_or_null(TypeFunc::Parms);
928 if (p == nullptr)
929 return nullptr;
930
931 for (DUIterator_Fast imax, i = p->fast_outs(imax); i < imax; i++) {
932 Node *use = p->fast_out(i);
933 if (use->is_CheckCastPP()) {
934 if (cast != nullptr) {
935 return this; // more than 1 CheckCastPP
936 }
937 cast = use;
938 } else if (!use->is_Initialize() &&
939 !use->is_AddP() &&
940 use->Opcode() != Op_MemBarStoreStore) {
941 // Expected uses are restricted to a CheckCastPP, an Initialize
942 // node, a MemBarStoreStore (clone) and AddP nodes. If we
943 // encounter any other use (a Phi node can be seen in rare
944 // cases) return this to prevent incorrect optimizations.
945 return this;
946 }
947 }
948 return cast;
949 }
950
951
952 CallProjections* CallNode::extract_projections(bool separate_io_proj, bool do_asserts) {
953 uint max_res = TypeFunc::Parms-1;
954 for (DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++) {
955 ProjNode *pn = fast_out(i)->as_Proj();
956 max_res = MAX2(max_res, pn->_con);
957 }
958
959 assert(max_res < _tf->range_cc()->cnt(), "result out of bounds");
960
961 uint projs_size = sizeof(CallProjections);
962 if (max_res > TypeFunc::Parms) {
963 projs_size += (max_res-TypeFunc::Parms)*sizeof(Node*);
964 }
965 char* projs_storage = resource_allocate_bytes(projs_size);
966 CallProjections* projs = new(projs_storage)CallProjections(max_res - TypeFunc::Parms + 1);
967
968 for (DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++) {
969 ProjNode *pn = fast_out(i)->as_Proj();
970 if (pn->outcnt() == 0) continue;
971 switch (pn->_con) {
972 case TypeFunc::Control:
973 {
974 // For Control (fallthrough) and I_O (catch_all_index) we have CatchProj -> Catch -> Proj
975 projs->fallthrough_proj = pn;
976 const Node* cn = pn->unique_ctrl_out_or_null();
977 if (cn != nullptr && cn->is_Catch()) {
978 ProjNode *cpn = nullptr;
979 for (DUIterator_Fast kmax, k = cn->fast_outs(kmax); k < kmax; k++) {
980 cpn = cn->fast_out(k)->as_Proj();
981 assert(cpn->is_CatchProj(), "must be a CatchProjNode");
982 if (cpn->_con == CatchProjNode::fall_through_index)
983 projs->fallthrough_catchproj = cpn;
984 else {
985 assert(cpn->_con == CatchProjNode::catch_all_index, "must be correct index.");
986 projs->catchall_catchproj = cpn;
987 }
988 }
989 }
990 break;
991 }
992 case TypeFunc::I_O:
993 if (pn->_is_io_use)
994 projs->catchall_ioproj = pn;
995 else
996 projs->fallthrough_ioproj = pn;
997 for (DUIterator j = pn->outs(); pn->has_out(j); j++) {
998 Node* e = pn->out(j);
999 if (e->Opcode() == Op_CreateEx && e->in(0)->is_CatchProj() && e->outcnt() > 0) {
1000 assert(projs->exobj == nullptr, "only one");
1001 projs->exobj = e;
1002 }
1003 }
1004 break;
1005 case TypeFunc::Memory:
1006 if (pn->_is_io_use)
1007 projs->catchall_memproj = pn;
1008 else
1009 projs->fallthrough_memproj = pn;
1010 break;
1011 case TypeFunc::Parms:
1012 projs->resproj[0] = pn;
1013 break;
1014 default:
1015 assert(pn->_con <= max_res, "unexpected projection from allocation node.");
1016 projs->resproj[pn->_con-TypeFunc::Parms] = pn;
1017 break;
1018 }
1019 }
1020
1021 // The resproj may not exist because the result could be ignored
1022 // and the exception object may not exist if an exception handler
1023 // swallows the exception but all the other must exist and be found.
1024 do_asserts = do_asserts && !Compile::current()->inlining_incrementally();
1025 assert(!do_asserts || projs->fallthrough_proj != nullptr, "must be found");
1026 assert(!do_asserts || projs->fallthrough_catchproj != nullptr, "must be found");
1027 assert(!do_asserts || projs->fallthrough_memproj != nullptr, "must be found");
1028 assert(!do_asserts || projs->fallthrough_ioproj != nullptr, "must be found");
1029 assert(!do_asserts || projs->catchall_catchproj != nullptr, "must be found");
1030 if (separate_io_proj) {
1031 assert(!do_asserts || projs->catchall_memproj != nullptr, "must be found");
1032 assert(!do_asserts || projs->catchall_ioproj != nullptr, "must be found");
1033 }
1034 return projs;
1035 }
1036
1037 Node* CallNode::Ideal(PhaseGVN* phase, bool can_reshape) {
1038 #ifdef ASSERT
1039 // Validate attached generator
1040 CallGenerator* cg = generator();
1041 if (cg != nullptr) {
1042 assert((is_CallStaticJava() && cg->is_mh_late_inline()) ||
1043 (is_CallDynamicJava() && cg->is_virtual_late_inline()), "mismatch");
1044 }
1045 #endif // ASSERT
1046 return SafePointNode::Ideal(phase, can_reshape);
1047 }
1048
1049 bool CallNode::is_call_to_arraycopystub() const {
1050 if (_name != nullptr && strstr(_name, "arraycopy") != nullptr) {
1051 return true;
1052 }
1053 return false;
1054 }
1055
1056 //=============================================================================
1057 uint CallJavaNode::size_of() const { return sizeof(*this); }
1058 bool CallJavaNode::cmp( const Node &n ) const {
1059 CallJavaNode &call = (CallJavaNode&)n;
1060 return CallNode::cmp(call) && _method == call._method &&
1061 _override_symbolic_info == call._override_symbolic_info;
1062 }
1063
1064 void CallJavaNode::copy_call_debug_info(PhaseIterGVN* phase, SafePointNode* sfpt) {
1065 // Copy debug information and adjust JVMState information
1066 uint old_dbg_start = sfpt->is_Call() ? sfpt->as_Call()->tf()->domain_sig()->cnt() : (uint)TypeFunc::Parms+1;
1067 uint new_dbg_start = tf()->domain_sig()->cnt();
1068 int jvms_adj = new_dbg_start - old_dbg_start;
1069 assert (new_dbg_start == req(), "argument count mismatch");
1070 Compile* C = phase->C;
1071
1072 // SafePointScalarObject node could be referenced several times in debug info.
1073 // Use Dict to record cloned nodes.
1074 Dict* sosn_map = new Dict(cmpkey,hashkey);
1075 for (uint i = old_dbg_start; i < sfpt->req(); i++) {
1076 Node* old_in = sfpt->in(i);
1077 // Clone old SafePointScalarObjectNodes, adjusting their field contents.
1078 if (old_in != nullptr && old_in->is_SafePointScalarObject()) {
1079 SafePointScalarObjectNode* old_sosn = old_in->as_SafePointScalarObject();
1080 bool new_node;
1081 Node* new_in = old_sosn->clone(sosn_map, new_node);
1082 if (new_node) { // New node?
1083 new_in->set_req(0, C->root()); // reset control edge
1084 new_in = phase->transform(new_in); // Register new node.
1085 }
1086 old_in = new_in;
1087 }
1088 add_req(old_in);
1089 }
1090
1091 // JVMS may be shared so clone it before we modify it
1092 set_jvms(sfpt->jvms() != nullptr ? sfpt->jvms()->clone_deep(C) : nullptr);
1093 for (JVMState *jvms = this->jvms(); jvms != nullptr; jvms = jvms->caller()) {
1094 jvms->set_map(this);
1095 jvms->set_locoff(jvms->locoff()+jvms_adj);
1096 jvms->set_stkoff(jvms->stkoff()+jvms_adj);
1097 jvms->set_monoff(jvms->monoff()+jvms_adj);
1098 jvms->set_scloff(jvms->scloff()+jvms_adj);
1099 jvms->set_endoff(jvms->endoff()+jvms_adj);
1100 }
1101 }
1102
1103 #ifdef ASSERT
1104 bool CallJavaNode::validate_symbolic_info() const {
1105 if (method() == nullptr) {
1106 return true; // call into runtime or uncommon trap
1107 }
1108 Bytecodes::Code bc = jvms()->method()->java_code_at_bci(jvms()->bci());
1109 if (EnableValhalla && (bc == Bytecodes::_if_acmpeq || bc == Bytecodes::_if_acmpne)) {
1110 return true;
1111 }
1112 ciMethod* symbolic_info = jvms()->method()->get_method_at_bci(jvms()->bci());
1113 ciMethod* callee = method();
1114 if (symbolic_info->is_method_handle_intrinsic() && !callee->is_method_handle_intrinsic()) {
1115 assert(override_symbolic_info(), "should be set");
1116 }
1117 assert(ciMethod::is_consistent_info(symbolic_info, callee), "inconsistent info");
1118 return true;
1119 }
1120 #endif
1121
1122 #ifndef PRODUCT
1123 void CallJavaNode::dump_spec(outputStream* st) const {
1124 if( _method ) _method->print_short_name(st);
1125 CallNode::dump_spec(st);
1126 }
1127
1128 void CallJavaNode::dump_compact_spec(outputStream* st) const {
1129 if (_method) {
1130 _method->print_short_name(st);
1131 } else {
1132 st->print("<?>");
1133 }
1134 }
1135 #endif
1136
1137 void CallJavaNode::register_for_late_inline() {
1138 if (generator() != nullptr) {
1139 Compile::current()->prepend_late_inline(generator());
1140 set_generator(nullptr);
1141 } else {
1142 assert(false, "repeated inline attempt");
1143 }
1144 }
1145
1146 //=============================================================================
1147 uint CallStaticJavaNode::size_of() const { return sizeof(*this); }
1148 bool CallStaticJavaNode::cmp( const Node &n ) const {
1149 CallStaticJavaNode &call = (CallStaticJavaNode&)n;
1150 return CallJavaNode::cmp(call);
1151 }
1152
1153 Node* CallStaticJavaNode::Ideal(PhaseGVN* phase, bool can_reshape) {
1154 if (can_reshape && uncommon_trap_request() != 0) {
1155 PhaseIterGVN* igvn = phase->is_IterGVN();
1156 if (remove_unknown_flat_array_load(igvn, in(0), in(TypeFunc::Memory), in(TypeFunc::Parms))) {
1157 if (!in(0)->is_Region()) {
1158 igvn->replace_input_of(this, 0, phase->C->top());
1159 }
1160 return this;
1161 }
1162 }
1163
1164 CallGenerator* cg = generator();
1165 if (can_reshape && cg != nullptr) {
1166 if (cg->is_mh_late_inline()) {
1167 assert(IncrementalInlineMH, "required");
1168 assert(cg->call_node() == this, "mismatch");
1169 assert(cg->method()->is_method_handle_intrinsic(), "required");
1170
1171 // Check whether this MH handle call becomes a candidate for inlining.
1172 ciMethod* callee = cg->method();
1173 vmIntrinsics::ID iid = callee->intrinsic_id();
1174 if (iid == vmIntrinsics::_invokeBasic) {
1175 if (in(TypeFunc::Parms)->Opcode() == Op_ConP) {
1176 register_for_late_inline();
1177 }
1178 } else if (iid == vmIntrinsics::_linkToNative) {
1179 // never retry
1180 } else {
1181 assert(callee->has_member_arg(), "wrong type of call?");
1182 if (in(TypeFunc::Parms + callee->arg_size() - 1)->Opcode() == Op_ConP) {
1183 register_for_late_inline();
1184 phase->C->inc_number_of_mh_late_inlines();
1185 }
1186 }
1187 } else {
1188 assert(IncrementalInline, "required");
1189 assert(!cg->method()->is_method_handle_intrinsic(), "required");
1190 if (phase->C->print_inlining()) {
1191 phase->C->inline_printer()->record(cg->method(), cg->call_node()->jvms(), InliningResult::FAILURE,
1192 "static call node changed: trying again");
1193 }
1194 register_for_late_inline();
1195 }
1196 }
1197 return CallNode::Ideal(phase, can_reshape);
1198 }
1199
1200 //----------------------------is_uncommon_trap----------------------------
1201 // Returns true if this is an uncommon trap.
1202 bool CallStaticJavaNode::is_uncommon_trap() const {
1203 return (_name != nullptr && !strcmp(_name, "uncommon_trap"));
1204 }
1205
1206 //----------------------------uncommon_trap_request----------------------------
1207 // If this is an uncommon trap, return the request code, else zero.
1208 int CallStaticJavaNode::uncommon_trap_request() const {
1209 return is_uncommon_trap() ? extract_uncommon_trap_request(this) : 0;
1210 }
1211 int CallStaticJavaNode::extract_uncommon_trap_request(const Node* call) {
1212 #ifndef PRODUCT
1213 if (!(call->req() > TypeFunc::Parms &&
1214 call->in(TypeFunc::Parms) != nullptr &&
1215 call->in(TypeFunc::Parms)->is_Con() &&
1216 call->in(TypeFunc::Parms)->bottom_type()->isa_int())) {
1217 assert(in_dump() != 0, "OK if dumping");
1218 tty->print("[bad uncommon trap]");
1219 return 0;
1220 }
1221 #endif
1222 return call->in(TypeFunc::Parms)->bottom_type()->is_int()->get_con();
1223 }
1224
1225 // Split if can cause the flat array branch of an array load with unknown type (see
1226 // Parse::array_load) to end in an uncommon trap. In that case, the call to
1227 // 'load_unknown_inline' is useless. Replace it with an uncommon trap with the same JVMState.
1228 bool CallStaticJavaNode::remove_unknown_flat_array_load(PhaseIterGVN* igvn, Node* ctl, Node* mem, Node* unc_arg) {
1229 if (ctl == nullptr || ctl->is_top() || mem == nullptr || mem->is_top() || !mem->is_MergeMem()) {
1230 return false;
1231 }
1232 if (ctl->is_Region()) {
1233 bool res = false;
1234 for (uint i = 1; i < ctl->req(); i++) {
1235 MergeMemNode* mm = mem->clone()->as_MergeMem();
1236 for (MergeMemStream mms(mm); mms.next_non_empty(); ) {
1237 Node* m = mms.memory();
1238 if (m->is_Phi() && m->in(0) == ctl) {
1239 mms.set_memory(m->in(i));
1240 }
1241 }
1242 if (remove_unknown_flat_array_load(igvn, ctl->in(i), mm, unc_arg)) {
1243 res = true;
1244 if (!ctl->in(i)->is_Region()) {
1245 igvn->replace_input_of(ctl, i, igvn->C->top());
1246 }
1247 }
1248 igvn->remove_dead_node(mm);
1249 }
1250 return res;
1251 }
1252 // Verify the control flow is ok
1253 Node* call = ctl;
1254 MemBarNode* membar = nullptr;
1255 for (;;) {
1256 if (call == nullptr || call->is_top()) {
1257 return false;
1258 }
1259 if (call->is_Proj() || call->is_Catch() || call->is_MemBar()) {
1260 call = call->in(0);
1261 } else if (call->Opcode() == Op_CallStaticJava && !call->in(0)->is_top() &&
1262 call->as_Call()->entry_point() == OptoRuntime::load_unknown_inline_Java()) {
1263 assert(call->in(0)->is_Proj() && call->in(0)->in(0)->is_MemBar(), "missing membar");
1264 membar = call->in(0)->in(0)->as_MemBar();
1265 break;
1266 } else {
1267 return false;
1268 }
1269 }
1270
1271 JVMState* jvms = call->jvms();
1272 if (igvn->C->too_many_traps(jvms->method(), jvms->bci(), Deoptimization::trap_request_reason(uncommon_trap_request()))) {
1273 return false;
1274 }
1275
1276 Node* call_mem = call->in(TypeFunc::Memory);
1277 if (call_mem == nullptr || call_mem->is_top()) {
1278 return false;
1279 }
1280 if (!call_mem->is_MergeMem()) {
1281 call_mem = MergeMemNode::make(call_mem);
1282 igvn->register_new_node_with_optimizer(call_mem);
1283 }
1284
1285 // Verify that there's no unexpected side effect
1286 for (MergeMemStream mms2(mem->as_MergeMem(), call_mem->as_MergeMem()); mms2.next_non_empty2(); ) {
1287 Node* m1 = mms2.is_empty() ? mms2.base_memory() : mms2.memory();
1288 Node* m2 = mms2.memory2();
1289
1290 for (uint i = 0; i < 100; i++) {
1291 if (m1 == m2) {
1292 break;
1293 } else if (m1->is_Proj()) {
1294 m1 = m1->in(0);
1295 } else if (m1->is_MemBar()) {
1296 m1 = m1->in(TypeFunc::Memory);
1297 } else if (m1->Opcode() == Op_CallStaticJava &&
1298 m1->as_Call()->entry_point() == OptoRuntime::load_unknown_inline_Java()) {
1299 if (m1 != call) {
1300 return false;
1301 }
1302 break;
1303 } else if (m1->is_MergeMem()) {
1304 MergeMemNode* mm = m1->as_MergeMem();
1305 int idx = mms2.alias_idx();
1306 if (idx == Compile::AliasIdxBot) {
1307 m1 = mm->base_memory();
1308 } else {
1309 m1 = mm->memory_at(idx);
1310 }
1311 } else {
1312 return false;
1313 }
1314 }
1315 }
1316 if (call_mem->outcnt() == 0) {
1317 igvn->remove_dead_node(call_mem);
1318 }
1319
1320 // Remove membar preceding the call
1321 membar->remove(igvn);
1322
1323 address call_addr = OptoRuntime::uncommon_trap_blob()->entry_point();
1324 CallNode* unc = new CallStaticJavaNode(OptoRuntime::uncommon_trap_Type(), call_addr, "uncommon_trap", nullptr);
1325 unc->init_req(TypeFunc::Control, call->in(0));
1326 unc->init_req(TypeFunc::I_O, call->in(TypeFunc::I_O));
1327 unc->init_req(TypeFunc::Memory, call->in(TypeFunc::Memory));
1328 unc->init_req(TypeFunc::FramePtr, call->in(TypeFunc::FramePtr));
1329 unc->init_req(TypeFunc::ReturnAdr, call->in(TypeFunc::ReturnAdr));
1330 unc->init_req(TypeFunc::Parms+0, unc_arg);
1331 unc->set_cnt(PROB_UNLIKELY_MAG(4));
1332 unc->copy_call_debug_info(igvn, call->as_CallStaticJava());
1333
1334 // Replace the call with an uncommon trap
1335 igvn->replace_input_of(call, 0, igvn->C->top());
1336
1337 igvn->register_new_node_with_optimizer(unc);
1338
1339 Node* ctrl = igvn->transform(new ProjNode(unc, TypeFunc::Control));
1340 Node* halt = igvn->transform(new HaltNode(ctrl, call->in(TypeFunc::FramePtr), "uncommon trap returned which should never happen"));
1341 igvn->add_input_to(igvn->C->root(), halt);
1342
1343 return true;
1344 }
1345
1346
1347 #ifndef PRODUCT
1348 void CallStaticJavaNode::dump_spec(outputStream *st) const {
1349 st->print("# Static ");
1350 if (_name != nullptr) {
1351 st->print("%s", _name);
1352 int trap_req = uncommon_trap_request();
1353 if (trap_req != 0) {
1354 char buf[100];
1355 st->print("(%s)",
1356 Deoptimization::format_trap_request(buf, sizeof(buf),
1357 trap_req));
1358 }
1359 st->print(" ");
1360 }
1361 CallJavaNode::dump_spec(st);
1362 }
1363
1364 void CallStaticJavaNode::dump_compact_spec(outputStream* st) const {
1365 if (_method) {
1366 _method->print_short_name(st);
1367 } else if (_name) {
1368 st->print("%s", _name);
1369 } else {
1370 st->print("<?>");
1371 }
1372 }
1373 #endif
1374
1375 //=============================================================================
1376 uint CallDynamicJavaNode::size_of() const { return sizeof(*this); }
1377 bool CallDynamicJavaNode::cmp( const Node &n ) const {
1378 CallDynamicJavaNode &call = (CallDynamicJavaNode&)n;
1379 return CallJavaNode::cmp(call);
1380 }
1381
1382 Node* CallDynamicJavaNode::Ideal(PhaseGVN* phase, bool can_reshape) {
1383 CallGenerator* cg = generator();
1384 if (can_reshape && cg != nullptr) {
1385 if (cg->is_virtual_late_inline()) {
1386 assert(IncrementalInlineVirtual, "required");
1387 assert(cg->call_node() == this, "mismatch");
1388
1389 // Recover symbolic info for method resolution.
1390 ciMethod* caller = jvms()->method();
1391 ciBytecodeStream iter(caller);
1392 iter.force_bci(jvms()->bci());
1393
1394 bool not_used1;
1395 ciSignature* not_used2;
1396 ciMethod* orig_callee = iter.get_method(not_used1, ¬_used2); // callee in the bytecode
1397 ciKlass* holder = iter.get_declared_method_holder();
1398 if (orig_callee->is_method_handle_intrinsic()) {
1399 assert(_override_symbolic_info, "required");
1400 orig_callee = method();
1401 holder = method()->holder();
1402 }
1403
1404 ciInstanceKlass* klass = ciEnv::get_instance_klass_for_declared_method_holder(holder);
1405
1406 Node* receiver_node = in(TypeFunc::Parms);
1407 const TypeOopPtr* receiver_type = phase->type(receiver_node)->isa_oopptr();
1408
1409 int not_used3;
1410 bool call_does_dispatch;
1411 ciMethod* callee = phase->C->optimize_virtual_call(caller, klass, holder, orig_callee, receiver_type, true /*is_virtual*/,
1412 call_does_dispatch, not_used3); // out-parameters
1413 if (!call_does_dispatch) {
1414 // Register for late inlining.
1415 cg->set_callee_method(callee);
1416 register_for_late_inline(); // MH late inlining prepends to the list, so do the same
1417 }
1418 } else {
1419 assert(IncrementalInline, "required");
1420 if (phase->C->print_inlining()) {
1421 phase->C->inline_printer()->record(cg->method(), cg->call_node()->jvms(), InliningResult::FAILURE,
1422 "dynamic call node changed: trying again");
1423 }
1424 register_for_late_inline();
1425 }
1426 }
1427 return CallNode::Ideal(phase, can_reshape);
1428 }
1429
1430 #ifndef PRODUCT
1431 void CallDynamicJavaNode::dump_spec(outputStream *st) const {
1432 st->print("# Dynamic ");
1433 CallJavaNode::dump_spec(st);
1434 }
1435 #endif
1436
1437 //=============================================================================
1438 uint CallRuntimeNode::size_of() const { return sizeof(*this); }
1439 bool CallRuntimeNode::cmp( const Node &n ) const {
1440 CallRuntimeNode &call = (CallRuntimeNode&)n;
1441 return CallNode::cmp(call) && !strcmp(_name,call._name);
1442 }
1443 #ifndef PRODUCT
1444 void CallRuntimeNode::dump_spec(outputStream *st) const {
1445 st->print("# ");
1446 st->print("%s", _name);
1447 CallNode::dump_spec(st);
1448 }
1449 #endif
1450 uint CallLeafVectorNode::size_of() const { return sizeof(*this); }
1451 bool CallLeafVectorNode::cmp( const Node &n ) const {
1452 CallLeafVectorNode &call = (CallLeafVectorNode&)n;
1453 return CallLeafNode::cmp(call) && _num_bits == call._num_bits;
1454 }
1455
1456 //------------------------------calling_convention-----------------------------
1457 void CallRuntimeNode::calling_convention(BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt) const {
1458 if (_entry_point == nullptr) {
1459 // The call to that stub is a special case: its inputs are
1460 // multiple values returned from a call and so it should follow
1461 // the return convention.
1462 SharedRuntime::java_return_convention(sig_bt, parm_regs, argcnt);
1463 return;
1464 }
1465 SharedRuntime::c_calling_convention(sig_bt, parm_regs, argcnt);
1466 }
1467
1468 void CallLeafVectorNode::calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const {
1469 #ifdef ASSERT
1470 assert(tf()->range_sig()->field_at(TypeFunc::Parms)->is_vect()->length_in_bytes() * BitsPerByte == _num_bits,
1471 "return vector size must match");
1472 const TypeTuple* d = tf()->domain_sig();
1473 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) {
1474 Node* arg = in(i);
1475 assert(arg->bottom_type()->is_vect()->length_in_bytes() * BitsPerByte == _num_bits,
1476 "vector argument size must match");
1477 }
1478 #endif
1479
1480 SharedRuntime::vector_calling_convention(parm_regs, _num_bits, argcnt);
1481 }
1482
1483 //=============================================================================
1484 //------------------------------calling_convention-----------------------------
1485
1486
1487 //=============================================================================
1488 #ifndef PRODUCT
1489 void CallLeafNode::dump_spec(outputStream *st) const {
1490 st->print("# ");
1491 st->print("%s", _name);
1492 CallNode::dump_spec(st);
1493 }
1494 #endif
1495
1496 uint CallLeafNoFPNode::match_edge(uint idx) const {
1497 // Null entry point is a special case for which the target is in a
1498 // register. Need to match that edge.
1499 return entry_point() == nullptr && idx == TypeFunc::Parms;
1500 }
1501
1502 //=============================================================================
1503
1504 void SafePointNode::set_local(JVMState* jvms, uint idx, Node *c) {
1505 assert(verify_jvms(jvms), "jvms must match");
1506 int loc = jvms->locoff() + idx;
1507 if (in(loc)->is_top() && idx > 0 && !c->is_top() ) {
1508 // If current local idx is top then local idx - 1 could
1509 // be a long/double that needs to be killed since top could
1510 // represent the 2nd half of the long/double.
1511 uint ideal = in(loc -1)->ideal_reg();
1512 if (ideal == Op_RegD || ideal == Op_RegL) {
1513 // set other (low index) half to top
1514 set_req(loc - 1, in(loc));
1515 }
1516 }
1517 set_req(loc, c);
1518 }
1519
1520 uint SafePointNode::size_of() const { return sizeof(*this); }
1521 bool SafePointNode::cmp( const Node &n ) const {
1522 return (&n == this); // Always fail except on self
1523 }
1524
1525 //-------------------------set_next_exception----------------------------------
1526 void SafePointNode::set_next_exception(SafePointNode* n) {
1527 assert(n == nullptr || n->Opcode() == Op_SafePoint, "correct value for next_exception");
1528 if (len() == req()) {
1529 if (n != nullptr) add_prec(n);
1530 } else {
1531 set_prec(req(), n);
1532 }
1533 }
1534
1535
1536 //----------------------------next_exception-----------------------------------
1537 SafePointNode* SafePointNode::next_exception() const {
1538 if (len() == req()) {
1539 return nullptr;
1540 } else {
1541 Node* n = in(req());
1542 assert(n == nullptr || n->Opcode() == Op_SafePoint, "no other uses of prec edges");
1543 return (SafePointNode*) n;
1544 }
1545 }
1546
1547
1548 //------------------------------Ideal------------------------------------------
1549 // Skip over any collapsed Regions
1550 Node *SafePointNode::Ideal(PhaseGVN *phase, bool can_reshape) {
1551 assert(_jvms == nullptr || ((uintptr_t)_jvms->map() & 1) || _jvms->map() == this, "inconsistent JVMState");
1552 if (remove_dead_region(phase, can_reshape)) {
1553 return this;
1554 }
1555 // Scalarize inline types in safepoint debug info.
1556 // Delay this until all inlining is over to avoid getting inconsistent debug info.
1557 if (phase->C->scalarize_in_safepoints() && can_reshape && jvms() != nullptr) {
1558 for (uint i = jvms()->debug_start(); i < jvms()->debug_end(); i++) {
1559 Node* n = in(i)->uncast();
1560 if (n->is_InlineType()) {
1561 n->as_InlineType()->make_scalar_in_safepoints(phase->is_IterGVN());
1562 }
1563 }
1564 }
1565 return nullptr;
1566 }
1567
1568 //------------------------------Identity---------------------------------------
1569 // Remove obviously duplicate safepoints
1570 Node* SafePointNode::Identity(PhaseGVN* phase) {
1571
1572 // If you have back to back safepoints, remove one
1573 if (in(TypeFunc::Control)->is_SafePoint()) {
1574 Node* out_c = unique_ctrl_out_or_null();
1575 // This can be the safepoint of an outer strip mined loop if the inner loop's backedge was removed. Replacing the
1576 // outer loop's safepoint could confuse removal of the outer loop.
1577 if (out_c != nullptr && !out_c->is_OuterStripMinedLoopEnd()) {
1578 return in(TypeFunc::Control);
1579 }
1580 }
1581
1582 // Transforming long counted loops requires a safepoint node. Do not
1583 // eliminate a safepoint until loop opts are over.
1584 if (in(0)->is_Proj() && !phase->C->major_progress()) {
1585 Node *n0 = in(0)->in(0);
1586 // Check if he is a call projection (except Leaf Call)
1587 if( n0->is_Catch() ) {
1588 n0 = n0->in(0)->in(0);
1589 assert( n0->is_Call(), "expect a call here" );
1590 }
1591 if( n0->is_Call() && n0->as_Call()->guaranteed_safepoint() ) {
1592 // Don't remove a safepoint belonging to an OuterStripMinedLoopEndNode.
1593 // If the loop dies, they will be removed together.
1594 if (has_out_with(Op_OuterStripMinedLoopEnd)) {
1595 return this;
1596 }
1597 // Useless Safepoint, so remove it
1598 return in(TypeFunc::Control);
1599 }
1600 }
1601
1602 return this;
1603 }
1604
1605 //------------------------------Value------------------------------------------
1606 const Type* SafePointNode::Value(PhaseGVN* phase) const {
1607 if (phase->type(in(0)) == Type::TOP) {
1608 return Type::TOP;
1609 }
1610 if (in(0) == this) {
1611 return Type::TOP; // Dead infinite loop
1612 }
1613 return Type::CONTROL;
1614 }
1615
1616 #ifndef PRODUCT
1617 void SafePointNode::dump_spec(outputStream *st) const {
1618 st->print(" SafePoint ");
1619 _replaced_nodes.dump(st);
1620 }
1621 #endif
1622
1623 const RegMask &SafePointNode::in_RegMask(uint idx) const {
1624 if( idx < TypeFunc::Parms ) return RegMask::Empty;
1625 // Values outside the domain represent debug info
1626 return *(Compile::current()->matcher()->idealreg2debugmask[in(idx)->ideal_reg()]);
1627 }
1628 const RegMask &SafePointNode::out_RegMask() const {
1629 return RegMask::Empty;
1630 }
1631
1632
1633 void SafePointNode::grow_stack(JVMState* jvms, uint grow_by) {
1634 assert((int)grow_by > 0, "sanity");
1635 int monoff = jvms->monoff();
1636 int scloff = jvms->scloff();
1637 int endoff = jvms->endoff();
1638 assert(endoff == (int)req(), "no other states or debug info after me");
1639 Node* top = Compile::current()->top();
1640 for (uint i = 0; i < grow_by; i++) {
1641 ins_req(monoff, top);
1642 }
1643 jvms->set_monoff(monoff + grow_by);
1644 jvms->set_scloff(scloff + grow_by);
1645 jvms->set_endoff(endoff + grow_by);
1646 }
1647
1648 void SafePointNode::push_monitor(const FastLockNode *lock) {
1649 // Add a LockNode, which points to both the original BoxLockNode (the
1650 // stack space for the monitor) and the Object being locked.
1651 const int MonitorEdges = 2;
1652 assert(JVMState::logMonitorEdges == exact_log2(MonitorEdges), "correct MonitorEdges");
1653 assert(req() == jvms()->endoff(), "correct sizing");
1654 int nextmon = jvms()->scloff();
1655 if (GenerateSynchronizationCode) {
1656 ins_req(nextmon, lock->box_node());
1657 ins_req(nextmon+1, lock->obj_node());
1658 } else {
1659 Node* top = Compile::current()->top();
1660 ins_req(nextmon, top);
1661 ins_req(nextmon, top);
1662 }
1663 jvms()->set_scloff(nextmon + MonitorEdges);
1664 jvms()->set_endoff(req());
1665 }
1666
1667 void SafePointNode::pop_monitor() {
1668 // Delete last monitor from debug info
1669 debug_only(int num_before_pop = jvms()->nof_monitors());
1670 const int MonitorEdges = 2;
1671 assert(JVMState::logMonitorEdges == exact_log2(MonitorEdges), "correct MonitorEdges");
1672 int scloff = jvms()->scloff();
1673 int endoff = jvms()->endoff();
1674 int new_scloff = scloff - MonitorEdges;
1675 int new_endoff = endoff - MonitorEdges;
1676 jvms()->set_scloff(new_scloff);
1677 jvms()->set_endoff(new_endoff);
1678 while (scloff > new_scloff) del_req_ordered(--scloff);
1679 assert(jvms()->nof_monitors() == num_before_pop-1, "");
1680 }
1681
1682 Node *SafePointNode::peek_monitor_box() const {
1683 int mon = jvms()->nof_monitors() - 1;
1684 assert(mon >= 0, "must have a monitor");
1685 return monitor_box(jvms(), mon);
1686 }
1687
1688 Node *SafePointNode::peek_monitor_obj() const {
1689 int mon = jvms()->nof_monitors() - 1;
1690 assert(mon >= 0, "must have a monitor");
1691 return monitor_obj(jvms(), mon);
1692 }
1693
1694 Node* SafePointNode::peek_operand(uint off) const {
1695 assert(jvms()->sp() > 0, "must have an operand");
1696 assert(off < jvms()->sp(), "off is out-of-range");
1697 return stack(jvms(), jvms()->sp() - off - 1);
1698 }
1699
1700 // Do we Match on this edge index or not? Match no edges
1701 uint SafePointNode::match_edge(uint idx) const {
1702 return (TypeFunc::Parms == idx);
1703 }
1704
1705 void SafePointNode::disconnect_from_root(PhaseIterGVN *igvn) {
1706 assert(Opcode() == Op_SafePoint, "only value for safepoint in loops");
1707 int nb = igvn->C->root()->find_prec_edge(this);
1708 if (nb != -1) {
1709 igvn->delete_precedence_of(igvn->C->root(), nb);
1710 }
1711 }
1712
1713 //============== SafePointScalarObjectNode ==============
1714
1715 SafePointScalarObjectNode::SafePointScalarObjectNode(const TypeOopPtr* tp, Node* alloc, uint first_index, uint depth, uint n_fields) :
1716 TypeNode(tp, 1), // 1 control input -- seems required. Get from root.
1717 _first_index(first_index),
1718 _depth(depth),
1719 _n_fields(n_fields),
1720 _alloc(alloc)
1721 {
1722 #ifdef ASSERT
1723 if (alloc != nullptr && !alloc->is_Allocate() && !(alloc->Opcode() == Op_VectorBox)) {
1724 alloc->dump();
1725 assert(false, "unexpected call node");
1726 }
1727 #endif
1728 init_class_id(Class_SafePointScalarObject);
1729 }
1730
1731 // Do not allow value-numbering for SafePointScalarObject node.
1732 uint SafePointScalarObjectNode::hash() const { return NO_HASH; }
1733 bool SafePointScalarObjectNode::cmp( const Node &n ) const {
1734 return (&n == this); // Always fail except on self
1735 }
1736
1737 uint SafePointScalarObjectNode::ideal_reg() const {
1738 return 0; // No matching to machine instruction
1739 }
1740
1741 const RegMask &SafePointScalarObjectNode::in_RegMask(uint idx) const {
1742 return *(Compile::current()->matcher()->idealreg2debugmask[in(idx)->ideal_reg()]);
1743 }
1744
1745 const RegMask &SafePointScalarObjectNode::out_RegMask() const {
1746 return RegMask::Empty;
1747 }
1748
1749 uint SafePointScalarObjectNode::match_edge(uint idx) const {
1750 return 0;
1751 }
1752
1753 SafePointScalarObjectNode*
1754 SafePointScalarObjectNode::clone(Dict* sosn_map, bool& new_node) const {
1755 void* cached = (*sosn_map)[(void*)this];
1756 if (cached != nullptr) {
1757 new_node = false;
1758 return (SafePointScalarObjectNode*)cached;
1759 }
1760 new_node = true;
1761 SafePointScalarObjectNode* res = (SafePointScalarObjectNode*)Node::clone();
1762 sosn_map->Insert((void*)this, (void*)res);
1763 return res;
1764 }
1765
1766
1767 #ifndef PRODUCT
1768 void SafePointScalarObjectNode::dump_spec(outputStream *st) const {
1769 st->print(" # fields@[%d..%d]", first_index(), first_index() + n_fields() - 1);
1770 }
1771 #endif
1772
1773 //============== SafePointScalarMergeNode ==============
1774
1775 SafePointScalarMergeNode::SafePointScalarMergeNode(const TypeOopPtr* tp, int merge_pointer_idx) :
1776 TypeNode(tp, 1), // 1 control input -- seems required. Get from root.
1777 _merge_pointer_idx(merge_pointer_idx)
1778 {
1779 init_class_id(Class_SafePointScalarMerge);
1780 }
1781
1782 // Do not allow value-numbering for SafePointScalarMerge node.
1783 uint SafePointScalarMergeNode::hash() const { return NO_HASH; }
1784 bool SafePointScalarMergeNode::cmp( const Node &n ) const {
1785 return (&n == this); // Always fail except on self
1786 }
1787
1788 uint SafePointScalarMergeNode::ideal_reg() const {
1789 return 0; // No matching to machine instruction
1790 }
1791
1792 const RegMask &SafePointScalarMergeNode::in_RegMask(uint idx) const {
1793 return *(Compile::current()->matcher()->idealreg2debugmask[in(idx)->ideal_reg()]);
1794 }
1795
1796 const RegMask &SafePointScalarMergeNode::out_RegMask() const {
1797 return RegMask::Empty;
1798 }
1799
1800 uint SafePointScalarMergeNode::match_edge(uint idx) const {
1801 return 0;
1802 }
1803
1804 SafePointScalarMergeNode*
1805 SafePointScalarMergeNode::clone(Dict* sosn_map, bool& new_node) const {
1806 void* cached = (*sosn_map)[(void*)this];
1807 if (cached != nullptr) {
1808 new_node = false;
1809 return (SafePointScalarMergeNode*)cached;
1810 }
1811 new_node = true;
1812 SafePointScalarMergeNode* res = (SafePointScalarMergeNode*)Node::clone();
1813 sosn_map->Insert((void*)this, (void*)res);
1814 return res;
1815 }
1816
1817 #ifndef PRODUCT
1818 void SafePointScalarMergeNode::dump_spec(outputStream *st) const {
1819 st->print(" # merge_pointer_idx=%d, scalarized_objects=%d", _merge_pointer_idx, req()-1);
1820 }
1821 #endif
1822
1823 //=============================================================================
1824 uint AllocateNode::size_of() const { return sizeof(*this); }
1825
1826 AllocateNode::AllocateNode(Compile* C, const TypeFunc *atype,
1827 Node *ctrl, Node *mem, Node *abio,
1828 Node *size, Node *klass_node,
1829 Node* initial_test,
1830 InlineTypeNode* inline_type_node)
1831 : CallNode(atype, nullptr, TypeRawPtr::BOTTOM)
1832 {
1833 init_class_id(Class_Allocate);
1834 init_flags(Flag_is_macro);
1835 _is_scalar_replaceable = false;
1836 _is_non_escaping = false;
1837 _is_allocation_MemBar_redundant = false;
1838 _larval = false;
1839 Node *topnode = C->top();
1840
1841 init_req( TypeFunc::Control , ctrl );
1842 init_req( TypeFunc::I_O , abio );
1843 init_req( TypeFunc::Memory , mem );
1844 init_req( TypeFunc::ReturnAdr, topnode );
1845 init_req( TypeFunc::FramePtr , topnode );
1846 init_req( AllocSize , size);
1847 init_req( KlassNode , klass_node);
1848 init_req( InitialTest , initial_test);
1849 init_req( ALength , topnode);
1850 init_req( ValidLengthTest , topnode);
1851 init_req( InlineType , inline_type_node);
1852 // DefaultValue defaults to nullptr
1853 // RawDefaultValue defaults to nullptr
1854 C->add_macro_node(this);
1855 }
1856
1857 void AllocateNode::compute_MemBar_redundancy(ciMethod* initializer)
1858 {
1859 assert(initializer != nullptr &&
1860 (initializer->is_object_constructor() || initializer->is_class_initializer()),
1861 "unexpected initializer method");
1862 BCEscapeAnalyzer* analyzer = initializer->get_bcea();
1863 if (analyzer == nullptr) {
1864 return;
1865 }
1866
1867 // Allocation node is first parameter in its initializer
1868 if (analyzer->is_arg_stack(0) || analyzer->is_arg_local(0)) {
1869 _is_allocation_MemBar_redundant = true;
1870 }
1871 }
1872
1873 Node* AllocateNode::make_ideal_mark(PhaseGVN* phase, Node* control, Node* mem) {
1874 Node* mark_node = nullptr;
1875 if (UseCompactObjectHeaders || EnableValhalla) {
1876 Node* klass_node = in(AllocateNode::KlassNode);
1877 Node* proto_adr = phase->transform(new AddPNode(klass_node, klass_node, phase->MakeConX(in_bytes(Klass::prototype_header_offset()))));
1878 mark_node = LoadNode::make(*phase, control, mem, proto_adr, TypeRawPtr::BOTTOM, TypeX_X, TypeX_X->basic_type(), MemNode::unordered);
1879 if (EnableValhalla) {
1880 mark_node = phase->transform(mark_node);
1881 // Avoid returning a constant (old node) here because this method is used by LoadNode::Ideal
1882 mark_node = new OrXNode(mark_node, phase->MakeConX(_larval ? markWord::larval_bit_in_place : 0));
1883 }
1884 return mark_node;
1885 } else {
1886 return phase->MakeConX(markWord::prototype().value());
1887 }
1888 }
1889
1890 // Retrieve the length from the AllocateArrayNode. Narrow the type with a
1891 // CastII, if appropriate. If we are not allowed to create new nodes, and
1892 // a CastII is appropriate, return null.
1893 Node *AllocateArrayNode::make_ideal_length(const TypeOopPtr* oop_type, PhaseValues* phase, bool allow_new_nodes) {
1894 Node *length = in(AllocateNode::ALength);
1895 assert(length != nullptr, "length is not null");
1896
1897 const TypeInt* length_type = phase->find_int_type(length);
1898 const TypeAryPtr* ary_type = oop_type->isa_aryptr();
1899
1900 if (ary_type != nullptr && length_type != nullptr) {
1901 const TypeInt* narrow_length_type = ary_type->narrow_size_type(length_type);
1902 if (narrow_length_type != length_type) {
1903 // Assert one of:
1904 // - the narrow_length is 0
1905 // - the narrow_length is not wider than length
1906 assert(narrow_length_type == TypeInt::ZERO ||
1907 (length_type->is_con() && narrow_length_type->is_con() &&
1908 (narrow_length_type->_hi <= length_type->_lo)) ||
1909 (narrow_length_type->_hi <= length_type->_hi &&
1910 narrow_length_type->_lo >= length_type->_lo),
1911 "narrow type must be narrower than length type");
1912
1913 // Return null if new nodes are not allowed
1914 if (!allow_new_nodes) {
1915 return nullptr;
1916 }
1917 // Create a cast which is control dependent on the initialization to
1918 // propagate the fact that the array length must be positive.
1919 InitializeNode* init = initialization();
1920 if (init != nullptr) {
1921 length = new CastIINode(init->proj_out_or_null(TypeFunc::Control), length, narrow_length_type);
1922 }
1923 }
1924 }
1925
1926 return length;
1927 }
1928
1929 //=============================================================================
1930 const TypeFunc* LockNode::_lock_type_Type = nullptr;
1931
1932 uint LockNode::size_of() const { return sizeof(*this); }
1933
1934 // Redundant lock elimination
1935 //
1936 // There are various patterns of locking where we release and
1937 // immediately reacquire a lock in a piece of code where no operations
1938 // occur in between that would be observable. In those cases we can
1939 // skip releasing and reacquiring the lock without violating any
1940 // fairness requirements. Doing this around a loop could cause a lock
1941 // to be held for a very long time so we concentrate on non-looping
1942 // control flow. We also require that the operations are fully
1943 // redundant meaning that we don't introduce new lock operations on
1944 // some paths so to be able to eliminate it on others ala PRE. This
1945 // would probably require some more extensive graph manipulation to
1946 // guarantee that the memory edges were all handled correctly.
1947 //
1948 // Assuming p is a simple predicate which can't trap in any way and s
1949 // is a synchronized method consider this code:
1950 //
1951 // s();
1952 // if (p)
1953 // s();
1954 // else
1955 // s();
1956 // s();
1957 //
1958 // 1. The unlocks of the first call to s can be eliminated if the
1959 // locks inside the then and else branches are eliminated.
1960 //
1961 // 2. The unlocks of the then and else branches can be eliminated if
1962 // the lock of the final call to s is eliminated.
1963 //
1964 // Either of these cases subsumes the simple case of sequential control flow
1965 //
1966 // Additionally we can eliminate versions without the else case:
1967 //
1968 // s();
1969 // if (p)
1970 // s();
1971 // s();
1972 //
1973 // 3. In this case we eliminate the unlock of the first s, the lock
1974 // and unlock in the then case and the lock in the final s.
1975 //
1976 // Note also that in all these cases the then/else pieces don't have
1977 // to be trivial as long as they begin and end with synchronization
1978 // operations.
1979 //
1980 // s();
1981 // if (p)
1982 // s();
1983 // f();
1984 // s();
1985 // s();
1986 //
1987 // The code will work properly for this case, leaving in the unlock
1988 // before the call to f and the relock after it.
1989 //
1990 // A potentially interesting case which isn't handled here is when the
1991 // locking is partially redundant.
1992 //
1993 // s();
1994 // if (p)
1995 // s();
1996 //
1997 // This could be eliminated putting unlocking on the else case and
1998 // eliminating the first unlock and the lock in the then side.
1999 // Alternatively the unlock could be moved out of the then side so it
2000 // was after the merge and the first unlock and second lock
2001 // eliminated. This might require less manipulation of the memory
2002 // state to get correct.
2003 //
2004 // Additionally we might allow work between a unlock and lock before
2005 // giving up eliminating the locks. The current code disallows any
2006 // conditional control flow between these operations. A formulation
2007 // similar to partial redundancy elimination computing the
2008 // availability of unlocking and the anticipatability of locking at a
2009 // program point would allow detection of fully redundant locking with
2010 // some amount of work in between. I'm not sure how often I really
2011 // think that would occur though. Most of the cases I've seen
2012 // indicate it's likely non-trivial work would occur in between.
2013 // There may be other more complicated constructs where we could
2014 // eliminate locking but I haven't seen any others appear as hot or
2015 // interesting.
2016 //
2017 // Locking and unlocking have a canonical form in ideal that looks
2018 // roughly like this:
2019 //
2020 // <obj>
2021 // | \\------+
2022 // | \ \
2023 // | BoxLock \
2024 // | | | \
2025 // | | \ \
2026 // | | FastLock
2027 // | | /
2028 // | | /
2029 // | | |
2030 //
2031 // Lock
2032 // |
2033 // Proj #0
2034 // |
2035 // MembarAcquire
2036 // |
2037 // Proj #0
2038 //
2039 // MembarRelease
2040 // |
2041 // Proj #0
2042 // |
2043 // Unlock
2044 // |
2045 // Proj #0
2046 //
2047 //
2048 // This code proceeds by processing Lock nodes during PhaseIterGVN
2049 // and searching back through its control for the proper code
2050 // patterns. Once it finds a set of lock and unlock operations to
2051 // eliminate they are marked as eliminatable which causes the
2052 // expansion of the Lock and Unlock macro nodes to make the operation a NOP
2053 //
2054 //=============================================================================
2055
2056 //
2057 // Utility function to skip over uninteresting control nodes. Nodes skipped are:
2058 // - copy regions. (These may not have been optimized away yet.)
2059 // - eliminated locking nodes
2060 //
2061 static Node *next_control(Node *ctrl) {
2062 if (ctrl == nullptr)
2063 return nullptr;
2064 while (1) {
2065 if (ctrl->is_Region()) {
2066 RegionNode *r = ctrl->as_Region();
2067 Node *n = r->is_copy();
2068 if (n == nullptr)
2069 break; // hit a region, return it
2070 else
2071 ctrl = n;
2072 } else if (ctrl->is_Proj()) {
2073 Node *in0 = ctrl->in(0);
2074 if (in0->is_AbstractLock() && in0->as_AbstractLock()->is_eliminated()) {
2075 ctrl = in0->in(0);
2076 } else {
2077 break;
2078 }
2079 } else {
2080 break; // found an interesting control
2081 }
2082 }
2083 return ctrl;
2084 }
2085 //
2086 // Given a control, see if it's the control projection of an Unlock which
2087 // operating on the same object as lock.
2088 //
2089 bool AbstractLockNode::find_matching_unlock(const Node* ctrl, LockNode* lock,
2090 GrowableArray<AbstractLockNode*> &lock_ops) {
2091 ProjNode *ctrl_proj = (ctrl->is_Proj()) ? ctrl->as_Proj() : nullptr;
2092 if (ctrl_proj != nullptr && ctrl_proj->_con == TypeFunc::Control) {
2093 Node *n = ctrl_proj->in(0);
2094 if (n != nullptr && n->is_Unlock()) {
2095 UnlockNode *unlock = n->as_Unlock();
2096 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
2097 Node* lock_obj = bs->step_over_gc_barrier(lock->obj_node());
2098 Node* unlock_obj = bs->step_over_gc_barrier(unlock->obj_node());
2099 if (lock_obj->eqv_uncast(unlock_obj) &&
2100 BoxLockNode::same_slot(lock->box_node(), unlock->box_node()) &&
2101 !unlock->is_eliminated()) {
2102 lock_ops.append(unlock);
2103 return true;
2104 }
2105 }
2106 }
2107 return false;
2108 }
2109
2110 //
2111 // Find the lock matching an unlock. Returns null if a safepoint
2112 // or complicated control is encountered first.
2113 LockNode *AbstractLockNode::find_matching_lock(UnlockNode* unlock) {
2114 LockNode *lock_result = nullptr;
2115 // find the matching lock, or an intervening safepoint
2116 Node *ctrl = next_control(unlock->in(0));
2117 while (1) {
2118 assert(ctrl != nullptr, "invalid control graph");
2119 assert(!ctrl->is_Start(), "missing lock for unlock");
2120 if (ctrl->is_top()) break; // dead control path
2121 if (ctrl->is_Proj()) ctrl = ctrl->in(0);
2122 if (ctrl->is_SafePoint()) {
2123 break; // found a safepoint (may be the lock we are searching for)
2124 } else if (ctrl->is_Region()) {
2125 // Check for a simple diamond pattern. Punt on anything more complicated
2126 if (ctrl->req() == 3 && ctrl->in(1) != nullptr && ctrl->in(2) != nullptr) {
2127 Node *in1 = next_control(ctrl->in(1));
2128 Node *in2 = next_control(ctrl->in(2));
2129 if (((in1->is_IfTrue() && in2->is_IfFalse()) ||
2130 (in2->is_IfTrue() && in1->is_IfFalse())) && (in1->in(0) == in2->in(0))) {
2131 ctrl = next_control(in1->in(0)->in(0));
2132 } else {
2133 break;
2134 }
2135 } else {
2136 break;
2137 }
2138 } else {
2139 ctrl = next_control(ctrl->in(0)); // keep searching
2140 }
2141 }
2142 if (ctrl->is_Lock()) {
2143 LockNode *lock = ctrl->as_Lock();
2144 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
2145 Node* lock_obj = bs->step_over_gc_barrier(lock->obj_node());
2146 Node* unlock_obj = bs->step_over_gc_barrier(unlock->obj_node());
2147 if (lock_obj->eqv_uncast(unlock_obj) &&
2148 BoxLockNode::same_slot(lock->box_node(), unlock->box_node())) {
2149 lock_result = lock;
2150 }
2151 }
2152 return lock_result;
2153 }
2154
2155 // This code corresponds to case 3 above.
2156
2157 bool AbstractLockNode::find_lock_and_unlock_through_if(Node* node, LockNode* lock,
2158 GrowableArray<AbstractLockNode*> &lock_ops) {
2159 Node* if_node = node->in(0);
2160 bool if_true = node->is_IfTrue();
2161
2162 if (if_node->is_If() && if_node->outcnt() == 2 && (if_true || node->is_IfFalse())) {
2163 Node *lock_ctrl = next_control(if_node->in(0));
2164 if (find_matching_unlock(lock_ctrl, lock, lock_ops)) {
2165 Node* lock1_node = nullptr;
2166 ProjNode* proj = if_node->as_If()->proj_out(!if_true);
2167 if (if_true) {
2168 if (proj->is_IfFalse() && proj->outcnt() == 1) {
2169 lock1_node = proj->unique_out();
2170 }
2171 } else {
2172 if (proj->is_IfTrue() && proj->outcnt() == 1) {
2173 lock1_node = proj->unique_out();
2174 }
2175 }
2176 if (lock1_node != nullptr && lock1_node->is_Lock()) {
2177 LockNode *lock1 = lock1_node->as_Lock();
2178 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
2179 Node* lock_obj = bs->step_over_gc_barrier(lock->obj_node());
2180 Node* lock1_obj = bs->step_over_gc_barrier(lock1->obj_node());
2181 if (lock_obj->eqv_uncast(lock1_obj) &&
2182 BoxLockNode::same_slot(lock->box_node(), lock1->box_node()) &&
2183 !lock1->is_eliminated()) {
2184 lock_ops.append(lock1);
2185 return true;
2186 }
2187 }
2188 }
2189 }
2190
2191 lock_ops.trunc_to(0);
2192 return false;
2193 }
2194
2195 bool AbstractLockNode::find_unlocks_for_region(const RegionNode* region, LockNode* lock,
2196 GrowableArray<AbstractLockNode*> &lock_ops) {
2197 // check each control merging at this point for a matching unlock.
2198 // in(0) should be self edge so skip it.
2199 for (int i = 1; i < (int)region->req(); i++) {
2200 Node *in_node = next_control(region->in(i));
2201 if (in_node != nullptr) {
2202 if (find_matching_unlock(in_node, lock, lock_ops)) {
2203 // found a match so keep on checking.
2204 continue;
2205 } else if (find_lock_and_unlock_through_if(in_node, lock, lock_ops)) {
2206 continue;
2207 }
2208
2209 // If we fall through to here then it was some kind of node we
2210 // don't understand or there wasn't a matching unlock, so give
2211 // up trying to merge locks.
2212 lock_ops.trunc_to(0);
2213 return false;
2214 }
2215 }
2216 return true;
2217
2218 }
2219
2220 // Check that all locks/unlocks associated with object come from balanced regions.
2221 bool AbstractLockNode::is_balanced() {
2222 Node* obj = obj_node();
2223 for (uint j = 0; j < obj->outcnt(); j++) {
2224 Node* n = obj->raw_out(j);
2225 if (n->is_AbstractLock() &&
2226 n->as_AbstractLock()->obj_node()->eqv_uncast(obj)) {
2227 BoxLockNode* n_box = n->as_AbstractLock()->box_node()->as_BoxLock();
2228 if (n_box->is_unbalanced()) {
2229 return false;
2230 }
2231 }
2232 }
2233 return true;
2234 }
2235
2236 const char* AbstractLockNode::_kind_names[] = {"Regular", "NonEscObj", "Coarsened", "Nested"};
2237
2238 const char * AbstractLockNode::kind_as_string() const {
2239 return _kind_names[_kind];
2240 }
2241
2242 #ifndef PRODUCT
2243 //
2244 // Create a counter which counts the number of times this lock is acquired
2245 //
2246 void AbstractLockNode::create_lock_counter(JVMState* state) {
2247 _counter = OptoRuntime::new_named_counter(state, NamedCounter::LockCounter);
2248 }
2249
2250 void AbstractLockNode::set_eliminated_lock_counter() {
2251 if (_counter) {
2252 // Update the counter to indicate that this lock was eliminated.
2253 // The counter update code will stay around even though the
2254 // optimizer will eliminate the lock operation itself.
2255 _counter->set_tag(NamedCounter::EliminatedLockCounter);
2256 }
2257 }
2258
2259 void AbstractLockNode::dump_spec(outputStream* st) const {
2260 st->print("%s ", _kind_names[_kind]);
2261 CallNode::dump_spec(st);
2262 }
2263
2264 void AbstractLockNode::dump_compact_spec(outputStream* st) const {
2265 st->print("%s", _kind_names[_kind]);
2266 }
2267 #endif
2268
2269 //=============================================================================
2270 Node *LockNode::Ideal(PhaseGVN *phase, bool can_reshape) {
2271
2272 // perform any generic optimizations first (returns 'this' or null)
2273 Node *result = SafePointNode::Ideal(phase, can_reshape);
2274 if (result != nullptr) return result;
2275 // Don't bother trying to transform a dead node
2276 if (in(0) && in(0)->is_top()) return nullptr;
2277
2278 // Now see if we can optimize away this lock. We don't actually
2279 // remove the locking here, we simply set the _eliminate flag which
2280 // prevents macro expansion from expanding the lock. Since we don't
2281 // modify the graph, the value returned from this function is the
2282 // one computed above.
2283 const Type* obj_type = phase->type(obj_node());
2284 if (can_reshape && EliminateLocks && !is_non_esc_obj() && !obj_type->is_inlinetypeptr()) {
2285 //
2286 // If we are locking an non-escaped object, the lock/unlock is unnecessary
2287 //
2288 ConnectionGraph *cgr = phase->C->congraph();
2289 if (cgr != nullptr && cgr->can_eliminate_lock(this)) {
2290 assert(!is_eliminated() || is_coarsened(), "sanity");
2291 // The lock could be marked eliminated by lock coarsening
2292 // code during first IGVN before EA. Replace coarsened flag
2293 // to eliminate all associated locks/unlocks.
2294 #ifdef ASSERT
2295 this->log_lock_optimization(phase->C,"eliminate_lock_set_non_esc1");
2296 #endif
2297 this->set_non_esc_obj();
2298 return result;
2299 }
2300
2301 if (!phase->C->do_locks_coarsening()) {
2302 return result; // Compiling without locks coarsening
2303 }
2304 //
2305 // Try lock coarsening
2306 //
2307 PhaseIterGVN* iter = phase->is_IterGVN();
2308 if (iter != nullptr && !is_eliminated()) {
2309
2310 GrowableArray<AbstractLockNode*> lock_ops;
2311
2312 Node *ctrl = next_control(in(0));
2313
2314 // now search back for a matching Unlock
2315 if (find_matching_unlock(ctrl, this, lock_ops)) {
2316 // found an unlock directly preceding this lock. This is the
2317 // case of single unlock directly control dependent on a
2318 // single lock which is the trivial version of case 1 or 2.
2319 } else if (ctrl->is_Region() ) {
2320 if (find_unlocks_for_region(ctrl->as_Region(), this, lock_ops)) {
2321 // found lock preceded by multiple unlocks along all paths
2322 // joining at this point which is case 3 in description above.
2323 }
2324 } else {
2325 // see if this lock comes from either half of an if and the
2326 // predecessors merges unlocks and the other half of the if
2327 // performs a lock.
2328 if (find_lock_and_unlock_through_if(ctrl, this, lock_ops)) {
2329 // found unlock splitting to an if with locks on both branches.
2330 }
2331 }
2332
2333 if (lock_ops.length() > 0) {
2334 // add ourselves to the list of locks to be eliminated.
2335 lock_ops.append(this);
2336
2337 #ifndef PRODUCT
2338 if (PrintEliminateLocks) {
2339 int locks = 0;
2340 int unlocks = 0;
2341 if (Verbose) {
2342 tty->print_cr("=== Locks coarsening ===");
2343 tty->print("Obj: ");
2344 obj_node()->dump();
2345 }
2346 for (int i = 0; i < lock_ops.length(); i++) {
2347 AbstractLockNode* lock = lock_ops.at(i);
2348 if (lock->Opcode() == Op_Lock)
2349 locks++;
2350 else
2351 unlocks++;
2352 if (Verbose) {
2353 tty->print("Box %d: ", i);
2354 box_node()->dump();
2355 tty->print(" %d: ", i);
2356 lock->dump();
2357 }
2358 }
2359 tty->print_cr("=== Coarsened %d unlocks and %d locks", unlocks, locks);
2360 }
2361 #endif
2362
2363 // for each of the identified locks, mark them
2364 // as eliminatable
2365 for (int i = 0; i < lock_ops.length(); i++) {
2366 AbstractLockNode* lock = lock_ops.at(i);
2367
2368 // Mark it eliminated by coarsening and update any counters
2369 #ifdef ASSERT
2370 lock->log_lock_optimization(phase->C, "eliminate_lock_set_coarsened");
2371 #endif
2372 lock->set_coarsened();
2373 }
2374 // Record this coarsened group.
2375 phase->C->add_coarsened_locks(lock_ops);
2376 } else if (ctrl->is_Region() &&
2377 iter->_worklist.member(ctrl)) {
2378 // We weren't able to find any opportunities but the region this
2379 // lock is control dependent on hasn't been processed yet so put
2380 // this lock back on the worklist so we can check again once any
2381 // region simplification has occurred.
2382 iter->_worklist.push(this);
2383 }
2384 }
2385 }
2386
2387 return result;
2388 }
2389
2390 //=============================================================================
2391 bool LockNode::is_nested_lock_region() {
2392 return is_nested_lock_region(nullptr);
2393 }
2394
2395 // p is used for access to compilation log; no logging if null
2396 bool LockNode::is_nested_lock_region(Compile * c) {
2397 BoxLockNode* box = box_node()->as_BoxLock();
2398 int stk_slot = box->stack_slot();
2399 if (stk_slot <= 0) {
2400 #ifdef ASSERT
2401 this->log_lock_optimization(c, "eliminate_lock_INLR_1");
2402 #endif
2403 return false; // External lock or it is not Box (Phi node).
2404 }
2405
2406 // Ignore complex cases: merged locks or multiple locks.
2407 Node* obj = obj_node();
2408 LockNode* unique_lock = nullptr;
2409 Node* bad_lock = nullptr;
2410 if (!box->is_simple_lock_region(&unique_lock, obj, &bad_lock)) {
2411 #ifdef ASSERT
2412 this->log_lock_optimization(c, "eliminate_lock_INLR_2a", bad_lock);
2413 #endif
2414 return false;
2415 }
2416 if (unique_lock != this) {
2417 #ifdef ASSERT
2418 this->log_lock_optimization(c, "eliminate_lock_INLR_2b", (unique_lock != nullptr ? unique_lock : bad_lock));
2419 if (PrintEliminateLocks && Verbose) {
2420 tty->print_cr("=============== unique_lock != this ============");
2421 tty->print(" this: ");
2422 this->dump();
2423 tty->print(" box: ");
2424 box->dump();
2425 tty->print(" obj: ");
2426 obj->dump();
2427 if (unique_lock != nullptr) {
2428 tty->print(" unique_lock: ");
2429 unique_lock->dump();
2430 }
2431 if (bad_lock != nullptr) {
2432 tty->print(" bad_lock: ");
2433 bad_lock->dump();
2434 }
2435 tty->print_cr("===============");
2436 }
2437 #endif
2438 return false;
2439 }
2440
2441 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
2442 obj = bs->step_over_gc_barrier(obj);
2443 // Look for external lock for the same object.
2444 SafePointNode* sfn = this->as_SafePoint();
2445 JVMState* youngest_jvms = sfn->jvms();
2446 int max_depth = youngest_jvms->depth();
2447 for (int depth = 1; depth <= max_depth; depth++) {
2448 JVMState* jvms = youngest_jvms->of_depth(depth);
2449 int num_mon = jvms->nof_monitors();
2450 // Loop over monitors
2451 for (int idx = 0; idx < num_mon; idx++) {
2452 Node* obj_node = sfn->monitor_obj(jvms, idx);
2453 obj_node = bs->step_over_gc_barrier(obj_node);
2454 BoxLockNode* box_node = sfn->monitor_box(jvms, idx)->as_BoxLock();
2455 if ((box_node->stack_slot() < stk_slot) && obj_node->eqv_uncast(obj)) {
2456 box->set_nested();
2457 return true;
2458 }
2459 }
2460 }
2461 #ifdef ASSERT
2462 this->log_lock_optimization(c, "eliminate_lock_INLR_3");
2463 #endif
2464 return false;
2465 }
2466
2467 //=============================================================================
2468 uint UnlockNode::size_of() const { return sizeof(*this); }
2469
2470 //=============================================================================
2471 Node *UnlockNode::Ideal(PhaseGVN *phase, bool can_reshape) {
2472
2473 // perform any generic optimizations first (returns 'this' or null)
2474 Node *result = SafePointNode::Ideal(phase, can_reshape);
2475 if (result != nullptr) return result;
2476 // Don't bother trying to transform a dead node
2477 if (in(0) && in(0)->is_top()) return nullptr;
2478
2479 // Now see if we can optimize away this unlock. We don't actually
2480 // remove the unlocking here, we simply set the _eliminate flag which
2481 // prevents macro expansion from expanding the unlock. Since we don't
2482 // modify the graph, the value returned from this function is the
2483 // one computed above.
2484 // Escape state is defined after Parse phase.
2485 const Type* obj_type = phase->type(obj_node());
2486 if (can_reshape && EliminateLocks && !is_non_esc_obj() && !obj_type->is_inlinetypeptr()) {
2487 //
2488 // If we are unlocking an non-escaped object, the lock/unlock is unnecessary.
2489 //
2490 ConnectionGraph *cgr = phase->C->congraph();
2491 if (cgr != nullptr && cgr->can_eliminate_lock(this)) {
2492 assert(!is_eliminated() || is_coarsened(), "sanity");
2493 // The lock could be marked eliminated by lock coarsening
2494 // code during first IGVN before EA. Replace coarsened flag
2495 // to eliminate all associated locks/unlocks.
2496 #ifdef ASSERT
2497 this->log_lock_optimization(phase->C, "eliminate_lock_set_non_esc2");
2498 #endif
2499 this->set_non_esc_obj();
2500 }
2501 }
2502 return result;
2503 }
2504
2505 void AbstractLockNode::log_lock_optimization(Compile *C, const char * tag, Node* bad_lock) const {
2506 if (C == nullptr) {
2507 return;
2508 }
2509 CompileLog* log = C->log();
2510 if (log != nullptr) {
2511 Node* box = box_node();
2512 Node* obj = obj_node();
2513 int box_id = box != nullptr ? box->_idx : -1;
2514 int obj_id = obj != nullptr ? obj->_idx : -1;
2515
2516 log->begin_head("%s compile_id='%d' lock_id='%d' class='%s' kind='%s' box_id='%d' obj_id='%d' bad_id='%d'",
2517 tag, C->compile_id(), this->_idx,
2518 is_Unlock() ? "unlock" : is_Lock() ? "lock" : "?",
2519 kind_as_string(), box_id, obj_id, (bad_lock != nullptr ? bad_lock->_idx : -1));
2520 log->stamp();
2521 log->end_head();
2522 JVMState* p = is_Unlock() ? (as_Unlock()->dbg_jvms()) : jvms();
2523 while (p != nullptr) {
2524 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method()));
2525 p = p->caller();
2526 }
2527 log->tail(tag);
2528 }
2529 }
2530
2531 bool CallNode::may_modify_arraycopy_helper(const TypeOopPtr* dest_t, const TypeOopPtr* t_oop, PhaseValues* phase) {
2532 if (dest_t->is_known_instance() && t_oop->is_known_instance()) {
2533 return dest_t->instance_id() == t_oop->instance_id();
2534 }
2535
2536 if (dest_t->isa_instptr() && !dest_t->is_instptr()->instance_klass()->equals(phase->C->env()->Object_klass())) {
2537 // clone
2538 if (t_oop->isa_aryptr()) {
2539 return false;
2540 }
2541 if (!t_oop->isa_instptr()) {
2542 return true;
2543 }
2544 if (dest_t->maybe_java_subtype_of(t_oop) || t_oop->maybe_java_subtype_of(dest_t)) {
2545 return true;
2546 }
2547 // unrelated
2548 return false;
2549 }
2550
2551 if (dest_t->isa_aryptr()) {
2552 // arraycopy or array clone
2553 if (t_oop->isa_instptr()) {
2554 return false;
2555 }
2556 if (!t_oop->isa_aryptr()) {
2557 return true;
2558 }
2559
2560 const Type* elem = dest_t->is_aryptr()->elem();
2561 if (elem == Type::BOTTOM) {
2562 // An array but we don't know what elements are
2563 return true;
2564 }
2565
2566 dest_t = dest_t->is_aryptr()->with_field_offset(Type::OffsetBot)->add_offset(Type::OffsetBot)->is_oopptr();
2567 t_oop = t_oop->is_aryptr()->with_field_offset(Type::OffsetBot);
2568 uint dest_alias = phase->C->get_alias_index(dest_t);
2569 uint t_oop_alias = phase->C->get_alias_index(t_oop);
2570
2571 return dest_alias == t_oop_alias;
2572 }
2573
2574 return true;
2575 }