1 /*
2 * Copyright 1997-2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // Portions of code courtesy of Clifford Click
26
27 // Optimization - Graph Style
28
29 #include "incls/_precompiled.incl"
30 #include "incls/_callnode.cpp.incl"
31
32 //=============================================================================
33 uint StartNode::size_of() const { return sizeof(*this); }
34 uint StartNode::cmp( const Node &n ) const
35 { return _domain == ((StartNode&)n)._domain; }
36 const Type *StartNode::bottom_type() const { return _domain; }
37 const Type *StartNode::Value(PhaseTransform *phase) const { return _domain; }
38 #ifndef PRODUCT
39 void StartNode::dump_spec(outputStream *st) const { st->print(" #"); _domain->dump_on(st);}
40 #endif
41
42 //------------------------------Ideal------------------------------------------
43 Node *StartNode::Ideal(PhaseGVN *phase, bool can_reshape){
44 return remove_dead_region(phase, can_reshape) ? this : NULL;
45 }
46
47 //------------------------------calling_convention-----------------------------
48 void StartNode::calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const {
49 Matcher::calling_convention( sig_bt, parm_regs, argcnt, false );
50 }
51
52 //------------------------------Registers--------------------------------------
53 const RegMask &StartNode::in_RegMask(uint) const {
54 return RegMask::Empty;
55 }
56
57 //------------------------------match------------------------------------------
58 // Construct projections for incoming parameters, and their RegMask info
59 Node *StartNode::match( const ProjNode *proj, const Matcher *match ) {
60 switch (proj->_con) {
61 case TypeFunc::Control:
62 case TypeFunc::I_O:
63 case TypeFunc::Memory:
64 return new (match->C, 1) MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj);
65 case TypeFunc::FramePtr:
66 return new (match->C, 1) MachProjNode(this,proj->_con,Matcher::c_frame_ptr_mask, Op_RegP);
67 case TypeFunc::ReturnAdr:
68 return new (match->C, 1) MachProjNode(this,proj->_con,match->_return_addr_mask,Op_RegP);
69 case TypeFunc::Parms:
70 default: {
71 uint parm_num = proj->_con - TypeFunc::Parms;
72 const Type *t = _domain->field_at(proj->_con);
73 if (t->base() == Type::Half) // 2nd half of Longs and Doubles
74 return new (match->C, 1) ConNode(Type::TOP);
75 uint ideal_reg = Matcher::base2reg[t->base()];
76 RegMask &rm = match->_calling_convention_mask[parm_num];
77 return new (match->C, 1) MachProjNode(this,proj->_con,rm,ideal_reg);
78 }
79 }
80 return NULL;
81 }
82
83 //------------------------------StartOSRNode----------------------------------
84 // The method start node for an on stack replacement adapter
85
86 //------------------------------osr_domain-----------------------------
87 const TypeTuple *StartOSRNode::osr_domain() {
88 const Type **fields = TypeTuple::fields(2);
89 fields[TypeFunc::Parms+0] = TypeRawPtr::BOTTOM; // address of osr buffer
90
91 return TypeTuple::make(TypeFunc::Parms+1, fields);
92 }
93
94 //=============================================================================
95 const char * const ParmNode::names[TypeFunc::Parms+1] = {
96 "Control", "I_O", "Memory", "FramePtr", "ReturnAdr", "Parms"
97 };
98
99 #ifndef PRODUCT
100 void ParmNode::dump_spec(outputStream *st) const {
101 if( _con < TypeFunc::Parms ) {
102 st->print(names[_con]);
103 } else {
104 st->print("Parm%d: ",_con-TypeFunc::Parms);
105 // Verbose and WizardMode dump bottom_type for all nodes
106 if( !Verbose && !WizardMode ) bottom_type()->dump_on(st);
107 }
108 }
109 #endif
110
111 uint ParmNode::ideal_reg() const {
112 switch( _con ) {
113 case TypeFunc::Control : // fall through
114 case TypeFunc::I_O : // fall through
115 case TypeFunc::Memory : return 0;
116 case TypeFunc::FramePtr : // fall through
117 case TypeFunc::ReturnAdr: return Op_RegP;
118 default : assert( _con > TypeFunc::Parms, "" );
119 // fall through
120 case TypeFunc::Parms : {
121 // Type of argument being passed
122 const Type *t = in(0)->as_Start()->_domain->field_at(_con);
123 return Matcher::base2reg[t->base()];
124 }
125 }
126 ShouldNotReachHere();
127 return 0;
128 }
129
130 //=============================================================================
131 ReturnNode::ReturnNode(uint edges, Node *cntrl, Node *i_o, Node *memory, Node *frameptr, Node *retadr ) : Node(edges) {
132 init_req(TypeFunc::Control,cntrl);
133 init_req(TypeFunc::I_O,i_o);
134 init_req(TypeFunc::Memory,memory);
135 init_req(TypeFunc::FramePtr,frameptr);
136 init_req(TypeFunc::ReturnAdr,retadr);
137 }
138
139 Node *ReturnNode::Ideal(PhaseGVN *phase, bool can_reshape){
140 return remove_dead_region(phase, can_reshape) ? this : NULL;
141 }
142
143 const Type *ReturnNode::Value( PhaseTransform *phase ) const {
144 return ( phase->type(in(TypeFunc::Control)) == Type::TOP)
145 ? Type::TOP
146 : Type::BOTTOM;
147 }
148
149 // Do we Match on this edge index or not? No edges on return nodes
150 uint ReturnNode::match_edge(uint idx) const {
151 return 0;
152 }
153
154
155 #ifndef PRODUCT
156 void ReturnNode::dump_req() const {
157 // Dump the required inputs, enclosed in '(' and ')'
158 uint i; // Exit value of loop
159 for( i=0; i<req(); i++ ) { // For all required inputs
160 if( i == TypeFunc::Parms ) tty->print("returns");
161 if( in(i) ) tty->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx);
162 else tty->print("_ ");
163 }
164 }
165 #endif
166
167 //=============================================================================
168 RethrowNode::RethrowNode(
169 Node* cntrl,
170 Node* i_o,
171 Node* memory,
172 Node* frameptr,
173 Node* ret_adr,
174 Node* exception
175 ) : Node(TypeFunc::Parms + 1) {
176 init_req(TypeFunc::Control , cntrl );
177 init_req(TypeFunc::I_O , i_o );
178 init_req(TypeFunc::Memory , memory );
179 init_req(TypeFunc::FramePtr , frameptr );
180 init_req(TypeFunc::ReturnAdr, ret_adr);
181 init_req(TypeFunc::Parms , exception);
182 }
183
184 Node *RethrowNode::Ideal(PhaseGVN *phase, bool can_reshape){
185 return remove_dead_region(phase, can_reshape) ? this : NULL;
186 }
187
188 const Type *RethrowNode::Value( PhaseTransform *phase ) const {
189 return (phase->type(in(TypeFunc::Control)) == Type::TOP)
190 ? Type::TOP
191 : Type::BOTTOM;
192 }
193
194 uint RethrowNode::match_edge(uint idx) const {
195 return 0;
196 }
197
198 #ifndef PRODUCT
199 void RethrowNode::dump_req() const {
200 // Dump the required inputs, enclosed in '(' and ')'
201 uint i; // Exit value of loop
202 for( i=0; i<req(); i++ ) { // For all required inputs
203 if( i == TypeFunc::Parms ) tty->print("exception");
204 if( in(i) ) tty->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx);
205 else tty->print("_ ");
206 }
207 }
208 #endif
209
210 //=============================================================================
211 // Do we Match on this edge index or not? Match only target address & method
212 uint TailCallNode::match_edge(uint idx) const {
213 return TypeFunc::Parms <= idx && idx <= TypeFunc::Parms+1;
214 }
215
216 //=============================================================================
217 // Do we Match on this edge index or not? Match only target address & oop
218 uint TailJumpNode::match_edge(uint idx) const {
219 return TypeFunc::Parms <= idx && idx <= TypeFunc::Parms+1;
220 }
221
222 //=============================================================================
223 JVMState::JVMState(ciMethod* method, JVMState* caller) {
224 assert(method != NULL, "must be valid call site");
225 _method = method;
226 debug_only(_bci = -99); // random garbage value
227 debug_only(_map = (SafePointNode*)-1);
228 _caller = caller;
229 _depth = 1 + (caller == NULL ? 0 : caller->depth());
230 _locoff = TypeFunc::Parms;
231 _stkoff = _locoff + _method->max_locals();
232 _monoff = _stkoff + _method->max_stack();
233 _scloff = _monoff;
234 _endoff = _monoff;
235 _sp = 0;
236 }
237 JVMState::JVMState(int stack_size) {
238 _method = NULL;
239 _bci = InvocationEntryBci;
240 debug_only(_map = (SafePointNode*)-1);
241 _caller = NULL;
242 _depth = 1;
243 _locoff = TypeFunc::Parms;
244 _stkoff = _locoff;
245 _monoff = _stkoff + stack_size;
246 _scloff = _monoff;
247 _endoff = _monoff;
248 _sp = 0;
249 }
250
251 //--------------------------------of_depth-------------------------------------
252 JVMState* JVMState::of_depth(int d) const {
253 const JVMState* jvmp = this;
254 assert(0 < d && (uint)d <= depth(), "oob");
255 for (int skip = depth() - d; skip > 0; skip--) {
256 jvmp = jvmp->caller();
257 }
258 assert(jvmp->depth() == (uint)d, "found the right one");
259 return (JVMState*)jvmp;
260 }
261
262 //-----------------------------same_calls_as-----------------------------------
263 bool JVMState::same_calls_as(const JVMState* that) const {
264 if (this == that) return true;
265 if (this->depth() != that->depth()) return false;
266 const JVMState* p = this;
267 const JVMState* q = that;
268 for (;;) {
269 if (p->_method != q->_method) return false;
270 if (p->_method == NULL) return true; // bci is irrelevant
271 if (p->_bci != q->_bci) return false;
272 p = p->caller();
273 q = q->caller();
274 if (p == q) return true;
275 assert(p != NULL && q != NULL, "depth check ensures we don't run off end");
276 }
277 }
278
279 //------------------------------debug_start------------------------------------
280 uint JVMState::debug_start() const {
281 debug_only(JVMState* jvmroot = of_depth(1));
282 assert(jvmroot->locoff() <= this->locoff(), "youngest JVMState must be last");
283 return of_depth(1)->locoff();
284 }
285
286 //-------------------------------debug_end-------------------------------------
287 uint JVMState::debug_end() const {
288 debug_only(JVMState* jvmroot = of_depth(1));
289 assert(jvmroot->endoff() <= this->endoff(), "youngest JVMState must be last");
290 return endoff();
291 }
292
293 //------------------------------debug_depth------------------------------------
294 uint JVMState::debug_depth() const {
295 uint total = 0;
296 for (const JVMState* jvmp = this; jvmp != NULL; jvmp = jvmp->caller()) {
297 total += jvmp->debug_size();
298 }
299 return total;
300 }
301
302 #ifndef PRODUCT
303
304 //------------------------------format_helper----------------------------------
305 // Given an allocation (a Chaitin object) and a Node decide if the Node carries
306 // any defined value or not. If it does, print out the register or constant.
307 static void format_helper( PhaseRegAlloc *regalloc, outputStream* st, Node *n, const char *msg, uint i, GrowableArray<SafePointScalarObjectNode*> *scobjs ) {
308 if (n == NULL) { st->print(" NULL"); return; }
309 if (n->is_SafePointScalarObject()) {
310 // Scalar replacement.
311 SafePointScalarObjectNode* spobj = n->as_SafePointScalarObject();
312 scobjs->append_if_missing(spobj);
313 int sco_n = scobjs->find(spobj);
314 assert(sco_n >= 0, "");
315 st->print(" %s%d]=#ScObj" INT32_FORMAT, msg, i, sco_n);
316 return;
317 }
318 if( OptoReg::is_valid(regalloc->get_reg_first(n))) { // Check for undefined
319 char buf[50];
320 regalloc->dump_register(n,buf);
321 st->print(" %s%d]=%s",msg,i,buf);
322 } else { // No register, but might be constant
323 const Type *t = n->bottom_type();
324 switch (t->base()) {
325 case Type::Int:
326 st->print(" %s%d]=#"INT32_FORMAT,msg,i,t->is_int()->get_con());
327 break;
328 case Type::AnyPtr:
329 assert( t == TypePtr::NULL_PTR, "" );
330 st->print(" %s%d]=#NULL",msg,i);
331 break;
332 case Type::AryPtr:
333 case Type::KlassPtr:
334 case Type::InstPtr:
335 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,t->isa_oopptr()->const_oop());
336 break;
337 case Type::NarrowOop:
338 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,t->make_ptr()->isa_oopptr()->const_oop());
339 break;
340 case Type::RawPtr:
341 st->print(" %s%d]=#Raw" INTPTR_FORMAT,msg,i,t->is_rawptr());
342 break;
343 case Type::DoubleCon:
344 st->print(" %s%d]=#%fD",msg,i,t->is_double_constant()->_d);
345 break;
346 case Type::FloatCon:
347 st->print(" %s%d]=#%fF",msg,i,t->is_float_constant()->_f);
348 break;
349 case Type::Long:
350 st->print(" %s%d]=#"INT64_FORMAT,msg,i,t->is_long()->get_con());
351 break;
352 case Type::Half:
353 case Type::Top:
354 st->print(" %s%d]=_",msg,i);
355 break;
356 default: ShouldNotReachHere();
357 }
358 }
359 }
360
361 //------------------------------format-----------------------------------------
362 void JVMState::format(PhaseRegAlloc *regalloc, const Node *n, outputStream* st) const {
363 st->print(" #");
364 if( _method ) {
365 _method->print_short_name(st);
366 st->print(" @ bci:%d ",_bci);
367 } else {
368 st->print_cr(" runtime stub ");
369 return;
370 }
371 if (n->is_MachSafePoint()) {
372 GrowableArray<SafePointScalarObjectNode*> scobjs;
373 MachSafePointNode *mcall = n->as_MachSafePoint();
374 uint i;
375 // Print locals
376 for( i = 0; i < (uint)loc_size(); i++ )
377 format_helper( regalloc, st, mcall->local(this, i), "L[", i, &scobjs );
378 // Print stack
379 for (i = 0; i < (uint)stk_size(); i++) {
380 if ((uint)(_stkoff + i) >= mcall->len())
381 st->print(" oob ");
382 else
383 format_helper( regalloc, st, mcall->stack(this, i), "STK[", i, &scobjs );
384 }
385 for (i = 0; (int)i < nof_monitors(); i++) {
386 Node *box = mcall->monitor_box(this, i);
387 Node *obj = mcall->monitor_obj(this, i);
388 if ( OptoReg::is_valid(regalloc->get_reg_first(box)) ) {
389 while( !box->is_BoxLock() ) box = box->in(1);
390 format_helper( regalloc, st, box, "MON-BOX[", i, &scobjs );
391 } else {
392 OptoReg::Name box_reg = BoxLockNode::stack_slot(box);
393 st->print(" MON-BOX%d=%s+%d",
394 i,
395 OptoReg::regname(OptoReg::c_frame_pointer),
396 regalloc->reg2offset(box_reg));
397 }
398 const char* obj_msg = "MON-OBJ[";
399 if (EliminateLocks) {
400 while( !box->is_BoxLock() ) box = box->in(1);
401 if (box->as_BoxLock()->is_eliminated())
402 obj_msg = "MON-OBJ(LOCK ELIMINATED)[";
403 }
404 format_helper( regalloc, st, obj, obj_msg, i, &scobjs );
405 }
406
407 for (i = 0; i < (uint)scobjs.length(); i++) {
408 // Scalar replaced objects.
409 st->print_cr("");
410 st->print(" # ScObj" INT32_FORMAT " ", i);
411 SafePointScalarObjectNode* spobj = scobjs.at(i);
412 ciKlass* cik = spobj->bottom_type()->is_oopptr()->klass();
413 assert(cik->is_instance_klass() ||
414 cik->is_array_klass(), "Not supported allocation.");
415 ciInstanceKlass *iklass = NULL;
416 if (cik->is_instance_klass()) {
417 cik->print_name_on(st);
418 iklass = cik->as_instance_klass();
419 } else if (cik->is_type_array_klass()) {
420 cik->as_array_klass()->base_element_type()->print_name_on(st);
421 st->print("[%d]=", spobj->n_fields());
422 } else if (cik->is_obj_array_klass()) {
423 ciType* cie = cik->as_array_klass()->base_element_type();
424 int ndim = 1;
425 while (cie->is_obj_array_klass()) {
426 ndim += 1;
427 cie = cie->as_array_klass()->base_element_type();
428 }
429 cie->print_name_on(st);
430 while (ndim-- > 0) {
431 st->print("[]");
432 }
433 st->print("[%d]=", spobj->n_fields());
434 }
435 st->print("{");
436 uint nf = spobj->n_fields();
437 if (nf > 0) {
438 uint first_ind = spobj->first_index();
439 Node* fld_node = mcall->in(first_ind);
440 ciField* cifield;
441 if (iklass != NULL) {
442 st->print(" [");
443 cifield = iklass->nonstatic_field_at(0);
444 cifield->print_name_on(st);
445 format_helper( regalloc, st, fld_node, ":", 0, &scobjs );
446 } else {
447 format_helper( regalloc, st, fld_node, "[", 0, &scobjs );
448 }
449 for (uint j = 1; j < nf; j++) {
450 fld_node = mcall->in(first_ind+j);
451 if (iklass != NULL) {
452 st->print(", [");
453 cifield = iklass->nonstatic_field_at(j);
454 cifield->print_name_on(st);
455 format_helper( regalloc, st, fld_node, ":", j, &scobjs );
456 } else {
457 format_helper( regalloc, st, fld_node, ", [", j, &scobjs );
458 }
459 }
460 }
461 st->print(" }");
462 }
463 }
464 st->print_cr("");
465 if (caller() != NULL) caller()->format(regalloc, n, st);
466 }
467
468
469 void JVMState::dump_spec(outputStream *st) const {
470 if (_method != NULL) {
471 bool printed = false;
472 if (!Verbose) {
473 // The JVMS dumps make really, really long lines.
474 // Take out the most boring parts, which are the package prefixes.
475 char buf[500];
476 stringStream namest(buf, sizeof(buf));
477 _method->print_short_name(&namest);
478 if (namest.count() < sizeof(buf)) {
479 const char* name = namest.base();
480 if (name[0] == ' ') ++name;
481 const char* endcn = strchr(name, ':'); // end of class name
482 if (endcn == NULL) endcn = strchr(name, '(');
483 if (endcn == NULL) endcn = name + strlen(name);
484 while (endcn > name && endcn[-1] != '.' && endcn[-1] != '/')
485 --endcn;
486 st->print(" %s", endcn);
487 printed = true;
488 }
489 }
490 if (!printed)
491 _method->print_short_name(st);
492 st->print(" @ bci:%d",_bci);
493 } else {
494 st->print(" runtime stub");
495 }
496 if (caller() != NULL) caller()->dump_spec(st);
497 }
498
499
500 void JVMState::dump_on(outputStream* st) const {
501 if (_map && !((uintptr_t)_map & 1)) {
502 if (_map->len() > _map->req()) { // _map->has_exceptions()
503 Node* ex = _map->in(_map->req()); // _map->next_exception()
504 // skip the first one; it's already being printed
505 while (ex != NULL && ex->len() > ex->req()) {
506 ex = ex->in(ex->req()); // ex->next_exception()
507 ex->dump(1);
508 }
509 }
510 _map->dump(2);
511 }
512 st->print("JVMS depth=%d loc=%d stk=%d mon=%d scalar=%d end=%d mondepth=%d sp=%d bci=%d method=",
513 depth(), locoff(), stkoff(), monoff(), scloff(), endoff(), monitor_depth(), sp(), bci());
514 if (_method == NULL) {
515 st->print_cr("(none)");
516 } else {
517 _method->print_name(st);
518 st->cr();
519 if (bci() >= 0 && bci() < _method->code_size()) {
520 st->print(" bc: ");
521 _method->print_codes_on(bci(), bci()+1, st);
522 }
523 }
524 if (caller() != NULL) {
525 caller()->dump_on(st);
526 }
527 }
528
529 // Extra way to dump a jvms from the debugger,
530 // to avoid a bug with C++ member function calls.
531 void dump_jvms(JVMState* jvms) {
532 jvms->dump();
533 }
534 #endif
535
536 //--------------------------clone_shallow--------------------------------------
537 JVMState* JVMState::clone_shallow(Compile* C) const {
538 JVMState* n = has_method() ? new (C) JVMState(_method, _caller) : new (C) JVMState(0);
539 n->set_bci(_bci);
540 n->set_locoff(_locoff);
541 n->set_stkoff(_stkoff);
542 n->set_monoff(_monoff);
543 n->set_scloff(_scloff);
544 n->set_endoff(_endoff);
545 n->set_sp(_sp);
546 n->set_map(_map);
547 return n;
548 }
549
550 //---------------------------clone_deep----------------------------------------
551 JVMState* JVMState::clone_deep(Compile* C) const {
552 JVMState* n = clone_shallow(C);
553 for (JVMState* p = n; p->_caller != NULL; p = p->_caller) {
554 p->_caller = p->_caller->clone_shallow(C);
555 }
556 assert(n->depth() == depth(), "sanity");
557 assert(n->debug_depth() == debug_depth(), "sanity");
558 return n;
559 }
560
561 //=============================================================================
562 uint CallNode::cmp( const Node &n ) const
563 { return _tf == ((CallNode&)n)._tf && _jvms == ((CallNode&)n)._jvms; }
564 #ifndef PRODUCT
565 void CallNode::dump_req() const {
566 // Dump the required inputs, enclosed in '(' and ')'
567 uint i; // Exit value of loop
568 for( i=0; i<req(); i++ ) { // For all required inputs
569 if( i == TypeFunc::Parms ) tty->print("(");
570 if( in(i) ) tty->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx);
571 else tty->print("_ ");
572 }
573 tty->print(")");
574 }
575
576 void CallNode::dump_spec(outputStream *st) const {
577 st->print(" ");
578 tf()->dump_on(st);
579 if (_cnt != COUNT_UNKNOWN) st->print(" C=%f",_cnt);
580 if (jvms() != NULL) jvms()->dump_spec(st);
581 }
582 #endif
583
584 const Type *CallNode::bottom_type() const { return tf()->range(); }
585 const Type *CallNode::Value(PhaseTransform *phase) const {
586 if (phase->type(in(0)) == Type::TOP) return Type::TOP;
587 return tf()->range();
588 }
589
590 //------------------------------calling_convention-----------------------------
591 void CallNode::calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const {
592 // Use the standard compiler calling convention
593 Matcher::calling_convention( sig_bt, parm_regs, argcnt, true );
594 }
595
596
597 //------------------------------match------------------------------------------
598 // Construct projections for control, I/O, memory-fields, ..., and
599 // return result(s) along with their RegMask info
600 Node *CallNode::match( const ProjNode *proj, const Matcher *match ) {
601 switch (proj->_con) {
602 case TypeFunc::Control:
603 case TypeFunc::I_O:
604 case TypeFunc::Memory:
605 return new (match->C, 1) MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj);
606
607 case TypeFunc::Parms+1: // For LONG & DOUBLE returns
608 assert(tf()->_range->field_at(TypeFunc::Parms+1) == Type::HALF, "");
609 // 2nd half of doubles and longs
610 return new (match->C, 1) MachProjNode(this,proj->_con, RegMask::Empty, (uint)OptoReg::Bad);
611
612 case TypeFunc::Parms: { // Normal returns
613 uint ideal_reg = Matcher::base2reg[tf()->range()->field_at(TypeFunc::Parms)->base()];
614 OptoRegPair regs = is_CallRuntime()
615 ? match->c_return_value(ideal_reg,true) // Calls into C runtime
616 : match-> return_value(ideal_reg,true); // Calls into compiled Java code
617 RegMask rm = RegMask(regs.first());
618 if( OptoReg::is_valid(regs.second()) )
619 rm.Insert( regs.second() );
620 return new (match->C, 1) MachProjNode(this,proj->_con,rm,ideal_reg);
621 }
622
623 case TypeFunc::ReturnAdr:
624 case TypeFunc::FramePtr:
625 default:
626 ShouldNotReachHere();
627 }
628 return NULL;
629 }
630
631 // Do we Match on this edge index or not? Match no edges
632 uint CallNode::match_edge(uint idx) const {
633 return 0;
634 }
635
636 //
637 // Determine whether the call could modify the field of the specified
638 // instance at the specified offset.
639 //
640 bool CallNode::may_modify(const TypePtr *addr_t, PhaseTransform *phase) {
641 const TypeOopPtr *adrInst_t = addr_t->isa_oopptr();
642
643 // If not an OopPtr or not an instance type, assume the worst.
644 // Note: currently this method is called only for instance types.
645 if (adrInst_t == NULL || !adrInst_t->is_known_instance()) {
646 return true;
647 }
648 // The instance_id is set only for scalar-replaceable allocations which
649 // are not passed as arguments according to Escape Analysis.
650 return false;
651 }
652
653 // Does this call have a direct reference to n other than debug information?
654 bool CallNode::has_non_debug_use(Node *n) {
655 const TypeTuple * d = tf()->domain();
656 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) {
657 Node *arg = in(i);
658 if (arg == n) {
659 return true;
660 }
661 }
662 return false;
663 }
664
665 // Returns the unique CheckCastPP of a call
666 // or 'this' if there are several CheckCastPP
667 // or returns NULL if there is no one.
668 Node *CallNode::result_cast() {
669 Node *cast = NULL;
670
671 Node *p = proj_out(TypeFunc::Parms);
672 if (p == NULL)
673 return NULL;
674
675 for (DUIterator_Fast imax, i = p->fast_outs(imax); i < imax; i++) {
676 Node *use = p->fast_out(i);
677 if (use->is_CheckCastPP()) {
678 if (cast != NULL) {
679 return this; // more than 1 CheckCastPP
680 }
681 cast = use;
682 }
683 }
684 return cast;
685 }
686
687
688 //=============================================================================
689 uint CallJavaNode::size_of() const { return sizeof(*this); }
690 uint CallJavaNode::cmp( const Node &n ) const {
691 CallJavaNode &call = (CallJavaNode&)n;
692 return CallNode::cmp(call) && _method == call._method;
693 }
694 #ifndef PRODUCT
695 void CallJavaNode::dump_spec(outputStream *st) const {
696 if( _method ) _method->print_short_name(st);
697 CallNode::dump_spec(st);
698 }
699 #endif
700
701 //=============================================================================
702 uint CallStaticJavaNode::size_of() const { return sizeof(*this); }
703 uint CallStaticJavaNode::cmp( const Node &n ) const {
704 CallStaticJavaNode &call = (CallStaticJavaNode&)n;
705 return CallJavaNode::cmp(call);
706 }
707
708 //----------------------------uncommon_trap_request----------------------------
709 // If this is an uncommon trap, return the request code, else zero.
710 int CallStaticJavaNode::uncommon_trap_request() const {
711 if (_name != NULL && !strcmp(_name, "uncommon_trap")) {
712 return extract_uncommon_trap_request(this);
713 }
714 return 0;
715 }
716 int CallStaticJavaNode::extract_uncommon_trap_request(const Node* call) {
717 #ifndef PRODUCT
718 if (!(call->req() > TypeFunc::Parms &&
719 call->in(TypeFunc::Parms) != NULL &&
720 call->in(TypeFunc::Parms)->is_Con())) {
721 assert(_in_dump_cnt != 0, "OK if dumping");
722 tty->print("[bad uncommon trap]");
723 return 0;
724 }
725 #endif
726 return call->in(TypeFunc::Parms)->bottom_type()->is_int()->get_con();
727 }
728
729 #ifndef PRODUCT
730 void CallStaticJavaNode::dump_spec(outputStream *st) const {
731 st->print("# Static ");
732 if (_name != NULL) {
733 st->print("%s", _name);
734 int trap_req = uncommon_trap_request();
735 if (trap_req != 0) {
736 char buf[100];
737 st->print("(%s)",
738 Deoptimization::format_trap_request(buf, sizeof(buf),
739 trap_req));
740 }
741 st->print(" ");
742 }
743 CallJavaNode::dump_spec(st);
744 }
745 #endif
746
747 //=============================================================================
748 uint CallDynamicJavaNode::size_of() const { return sizeof(*this); }
749 uint CallDynamicJavaNode::cmp( const Node &n ) const {
750 CallDynamicJavaNode &call = (CallDynamicJavaNode&)n;
751 return CallJavaNode::cmp(call);
752 }
753 #ifndef PRODUCT
754 void CallDynamicJavaNode::dump_spec(outputStream *st) const {
755 st->print("# Dynamic ");
756 CallJavaNode::dump_spec(st);
757 }
758 #endif
759
760 //=============================================================================
761 uint CallRuntimeNode::size_of() const { return sizeof(*this); }
762 uint CallRuntimeNode::cmp( const Node &n ) const {
763 CallRuntimeNode &call = (CallRuntimeNode&)n;
764 return CallNode::cmp(call) && !strcmp(_name,call._name);
765 }
766 #ifndef PRODUCT
767 void CallRuntimeNode::dump_spec(outputStream *st) const {
768 st->print("# ");
769 st->print(_name);
770 CallNode::dump_spec(st);
771 }
772 #endif
773
774 //------------------------------calling_convention-----------------------------
775 void CallRuntimeNode::calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const {
776 Matcher::c_calling_convention( sig_bt, parm_regs, argcnt );
777 }
778
779 //=============================================================================
780 //------------------------------calling_convention-----------------------------
781
782
783 //=============================================================================
784 #ifndef PRODUCT
785 void CallLeafNode::dump_spec(outputStream *st) const {
786 st->print("# ");
787 st->print(_name);
788 CallNode::dump_spec(st);
789 }
790 #endif
791
792 //=============================================================================
793
794 void SafePointNode::set_local(JVMState* jvms, uint idx, Node *c) {
795 assert(verify_jvms(jvms), "jvms must match");
796 int loc = jvms->locoff() + idx;
797 if (in(loc)->is_top() && idx > 0 && !c->is_top() ) {
798 // If current local idx is top then local idx - 1 could
799 // be a long/double that needs to be killed since top could
800 // represent the 2nd half ofthe long/double.
801 uint ideal = in(loc -1)->ideal_reg();
802 if (ideal == Op_RegD || ideal == Op_RegL) {
803 // set other (low index) half to top
804 set_req(loc - 1, in(loc));
805 }
806 }
807 set_req(loc, c);
808 }
809
810 uint SafePointNode::size_of() const { return sizeof(*this); }
811 uint SafePointNode::cmp( const Node &n ) const {
812 return (&n == this); // Always fail except on self
813 }
814
815 //-------------------------set_next_exception----------------------------------
816 void SafePointNode::set_next_exception(SafePointNode* n) {
817 assert(n == NULL || n->Opcode() == Op_SafePoint, "correct value for next_exception");
818 if (len() == req()) {
819 if (n != NULL) add_prec(n);
820 } else {
821 set_prec(req(), n);
822 }
823 }
824
825
826 //----------------------------next_exception-----------------------------------
827 SafePointNode* SafePointNode::next_exception() const {
828 if (len() == req()) {
829 return NULL;
830 } else {
831 Node* n = in(req());
832 assert(n == NULL || n->Opcode() == Op_SafePoint, "no other uses of prec edges");
833 return (SafePointNode*) n;
834 }
835 }
836
837
838 //------------------------------Ideal------------------------------------------
839 // Skip over any collapsed Regions
840 Node *SafePointNode::Ideal(PhaseGVN *phase, bool can_reshape) {
841 return remove_dead_region(phase, can_reshape) ? this : NULL;
842 }
843
844 //------------------------------Identity---------------------------------------
845 // Remove obviously duplicate safepoints
846 Node *SafePointNode::Identity( PhaseTransform *phase ) {
847
848 // If you have back to back safepoints, remove one
849 if( in(TypeFunc::Control)->is_SafePoint() )
850 return in(TypeFunc::Control);
851
852 if( in(0)->is_Proj() ) {
853 Node *n0 = in(0)->in(0);
854 // Check if he is a call projection (except Leaf Call)
855 if( n0->is_Catch() ) {
856 n0 = n0->in(0)->in(0);
857 assert( n0->is_Call(), "expect a call here" );
858 }
859 if( n0->is_Call() && n0->as_Call()->guaranteed_safepoint() ) {
860 // Useless Safepoint, so remove it
861 return in(TypeFunc::Control);
862 }
863 }
864
865 return this;
866 }
867
868 //------------------------------Value------------------------------------------
869 const Type *SafePointNode::Value( PhaseTransform *phase ) const {
870 if( phase->type(in(0)) == Type::TOP ) return Type::TOP;
871 if( phase->eqv( in(0), this ) ) return Type::TOP; // Dead infinite loop
872 return Type::CONTROL;
873 }
874
875 #ifndef PRODUCT
876 void SafePointNode::dump_spec(outputStream *st) const {
877 st->print(" SafePoint ");
878 }
879 #endif
880
881 const RegMask &SafePointNode::in_RegMask(uint idx) const {
882 if( idx < TypeFunc::Parms ) return RegMask::Empty;
883 // Values outside the domain represent debug info
884 return *(Compile::current()->matcher()->idealreg2debugmask[in(idx)->ideal_reg()]);
885 }
886 const RegMask &SafePointNode::out_RegMask() const {
887 return RegMask::Empty;
888 }
889
890
891 void SafePointNode::grow_stack(JVMState* jvms, uint grow_by) {
892 assert((int)grow_by > 0, "sanity");
893 int monoff = jvms->monoff();
894 int scloff = jvms->scloff();
895 int endoff = jvms->endoff();
896 assert(endoff == (int)req(), "no other states or debug info after me");
897 Node* top = Compile::current()->top();
898 for (uint i = 0; i < grow_by; i++) {
899 ins_req(monoff, top);
900 }
901 jvms->set_monoff(monoff + grow_by);
902 jvms->set_scloff(scloff + grow_by);
903 jvms->set_endoff(endoff + grow_by);
904 }
905
906 void SafePointNode::push_monitor(const FastLockNode *lock) {
907 // Add a LockNode, which points to both the original BoxLockNode (the
908 // stack space for the monitor) and the Object being locked.
909 const int MonitorEdges = 2;
910 assert(JVMState::logMonitorEdges == exact_log2(MonitorEdges), "correct MonitorEdges");
911 assert(req() == jvms()->endoff(), "correct sizing");
912 int nextmon = jvms()->scloff();
913 if (GenerateSynchronizationCode) {
914 add_req(lock->box_node());
915 add_req(lock->obj_node());
916 } else {
917 Node* top = Compile::current()->top();
918 add_req(top);
919 add_req(top);
920 }
921 jvms()->set_scloff(nextmon+MonitorEdges);
922 jvms()->set_endoff(req());
923 }
924
925 void SafePointNode::pop_monitor() {
926 // Delete last monitor from debug info
927 debug_only(int num_before_pop = jvms()->nof_monitors());
928 const int MonitorEdges = (1<<JVMState::logMonitorEdges);
929 int scloff = jvms()->scloff();
930 int endoff = jvms()->endoff();
931 int new_scloff = scloff - MonitorEdges;
932 int new_endoff = endoff - MonitorEdges;
933 jvms()->set_scloff(new_scloff);
934 jvms()->set_endoff(new_endoff);
935 while (scloff > new_scloff) del_req(--scloff);
936 assert(jvms()->nof_monitors() == num_before_pop-1, "");
937 }
938
939 Node *SafePointNode::peek_monitor_box() const {
940 int mon = jvms()->nof_monitors() - 1;
941 assert(mon >= 0, "most have a monitor");
942 return monitor_box(jvms(), mon);
943 }
944
945 Node *SafePointNode::peek_monitor_obj() const {
946 int mon = jvms()->nof_monitors() - 1;
947 assert(mon >= 0, "most have a monitor");
948 return monitor_obj(jvms(), mon);
949 }
950
951 // Do we Match on this edge index or not? Match no edges
952 uint SafePointNode::match_edge(uint idx) const {
953 if( !needs_polling_address_input() )
954 return 0;
955
956 return (TypeFunc::Parms == idx);
957 }
958
959 //============== SafePointScalarObjectNode ==============
960
961 SafePointScalarObjectNode::SafePointScalarObjectNode(const TypeOopPtr* tp,
962 #ifdef ASSERT
963 AllocateNode* alloc,
964 #endif
965 uint first_index,
966 uint n_fields) :
967 TypeNode(tp, 1), // 1 control input -- seems required. Get from root.
968 #ifdef ASSERT
969 _alloc(alloc),
970 #endif
971 _first_index(first_index),
972 _n_fields(n_fields)
973 {
974 init_class_id(Class_SafePointScalarObject);
975 }
976
977 bool SafePointScalarObjectNode::pinned() const { return true; }
978 bool SafePointScalarObjectNode::depends_only_on_test() const { return false; }
979
980 uint SafePointScalarObjectNode::ideal_reg() const {
981 return 0; // No matching to machine instruction
982 }
983
984 const RegMask &SafePointScalarObjectNode::in_RegMask(uint idx) const {
985 return *(Compile::current()->matcher()->idealreg2debugmask[in(idx)->ideal_reg()]);
986 }
987
988 const RegMask &SafePointScalarObjectNode::out_RegMask() const {
989 return RegMask::Empty;
990 }
991
992 uint SafePointScalarObjectNode::match_edge(uint idx) const {
993 return 0;
994 }
995
996 SafePointScalarObjectNode*
997 SafePointScalarObjectNode::clone(int jvms_adj, Dict* sosn_map) const {
998 void* cached = (*sosn_map)[(void*)this];
999 if (cached != NULL) {
1000 return (SafePointScalarObjectNode*)cached;
1001 }
1002 Compile* C = Compile::current();
1003 SafePointScalarObjectNode* res = (SafePointScalarObjectNode*)Node::clone();
1004 res->_first_index += jvms_adj;
1005 sosn_map->Insert((void*)this, (void*)res);
1006 return res;
1007 }
1008
1009
1010 #ifndef PRODUCT
1011 void SafePointScalarObjectNode::dump_spec(outputStream *st) const {
1012 st->print(" # fields@[%d..%d]", first_index(),
1013 first_index() + n_fields() - 1);
1014 }
1015
1016 #endif
1017
1018 //=============================================================================
1019 uint AllocateNode::size_of() const { return sizeof(*this); }
1020
1021 AllocateNode::AllocateNode(Compile* C, const TypeFunc *atype,
1022 Node *ctrl, Node *mem, Node *abio,
1023 Node *size, Node *klass_node, Node *initial_test)
1024 : CallNode(atype, NULL, TypeRawPtr::BOTTOM)
1025 {
1026 init_class_id(Class_Allocate);
1027 init_flags(Flag_is_macro);
1028 _is_scalar_replaceable = false;
1029 Node *topnode = C->top();
1030
1031 init_req( TypeFunc::Control , ctrl );
1032 init_req( TypeFunc::I_O , abio );
1033 init_req( TypeFunc::Memory , mem );
1034 init_req( TypeFunc::ReturnAdr, topnode );
1035 init_req( TypeFunc::FramePtr , topnode );
1036 init_req( AllocSize , size);
1037 init_req( KlassNode , klass_node);
1038 init_req( InitialTest , initial_test);
1039 init_req( ALength , topnode);
1040 C->add_macro_node(this);
1041 }
1042
1043 //=============================================================================
1044 uint AllocateArrayNode::size_of() const { return sizeof(*this); }
1045
1046 // Retrieve the length from the AllocateArrayNode. Narrow the type with a
1047 // CastII, if appropriate. If we are not allowed to create new nodes, and
1048 // a CastII is appropriate, return NULL.
1049 Node *AllocateArrayNode::make_ideal_length(const TypeOopPtr* oop_type, PhaseTransform *phase, bool allow_new_nodes) {
1050 Node *length = in(AllocateNode::ALength);
1051 assert(length != NULL, "length is not null");
1052
1053 const TypeInt* length_type = phase->find_int_type(length);
1054 const TypeAryPtr* ary_type = oop_type->isa_aryptr();
1055
1056 if (ary_type != NULL && length_type != NULL) {
1057 const TypeInt* narrow_length_type = ary_type->narrow_size_type(length_type);
1058 if (narrow_length_type != length_type) {
1059 // Assert one of:
1060 // - the narrow_length is 0
1061 // - the narrow_length is not wider than length
1062 assert(narrow_length_type == TypeInt::ZERO ||
1063 (narrow_length_type->_hi <= length_type->_hi &&
1064 narrow_length_type->_lo >= length_type->_lo),
1065 "narrow type must be narrower than length type");
1066
1067 // Return NULL if new nodes are not allowed
1068 if (!allow_new_nodes) return NULL;
1069 // Create a cast which is control dependent on the initialization to
1070 // propagate the fact that the array length must be positive.
1071 length = new (phase->C, 2) CastIINode(length, narrow_length_type);
1072 length->set_req(0, initialization()->proj_out(0));
1073 }
1074 }
1075
1076 return length;
1077 }
1078
1079 //=============================================================================
1080 uint LockNode::size_of() const { return sizeof(*this); }
1081
1082 // Redundant lock elimination
1083 //
1084 // There are various patterns of locking where we release and
1085 // immediately reacquire a lock in a piece of code where no operations
1086 // occur in between that would be observable. In those cases we can
1087 // skip releasing and reacquiring the lock without violating any
1088 // fairness requirements. Doing this around a loop could cause a lock
1089 // to be held for a very long time so we concentrate on non-looping
1090 // control flow. We also require that the operations are fully
1091 // redundant meaning that we don't introduce new lock operations on
1092 // some paths so to be able to eliminate it on others ala PRE. This
1093 // would probably require some more extensive graph manipulation to
1094 // guarantee that the memory edges were all handled correctly.
1095 //
1096 // Assuming p is a simple predicate which can't trap in any way and s
1097 // is a synchronized method consider this code:
1098 //
1099 // s();
1100 // if (p)
1101 // s();
1102 // else
1103 // s();
1104 // s();
1105 //
1106 // 1. The unlocks of the first call to s can be eliminated if the
1107 // locks inside the then and else branches are eliminated.
1108 //
1109 // 2. The unlocks of the then and else branches can be eliminated if
1110 // the lock of the final call to s is eliminated.
1111 //
1112 // Either of these cases subsumes the simple case of sequential control flow
1113 //
1114 // Addtionally we can eliminate versions without the else case:
1115 //
1116 // s();
1117 // if (p)
1118 // s();
1119 // s();
1120 //
1121 // 3. In this case we eliminate the unlock of the first s, the lock
1122 // and unlock in the then case and the lock in the final s.
1123 //
1124 // Note also that in all these cases the then/else pieces don't have
1125 // to be trivial as long as they begin and end with synchronization
1126 // operations.
1127 //
1128 // s();
1129 // if (p)
1130 // s();
1131 // f();
1132 // s();
1133 // s();
1134 //
1135 // The code will work properly for this case, leaving in the unlock
1136 // before the call to f and the relock after it.
1137 //
1138 // A potentially interesting case which isn't handled here is when the
1139 // locking is partially redundant.
1140 //
1141 // s();
1142 // if (p)
1143 // s();
1144 //
1145 // This could be eliminated putting unlocking on the else case and
1146 // eliminating the first unlock and the lock in the then side.
1147 // Alternatively the unlock could be moved out of the then side so it
1148 // was after the merge and the first unlock and second lock
1149 // eliminated. This might require less manipulation of the memory
1150 // state to get correct.
1151 //
1152 // Additionally we might allow work between a unlock and lock before
1153 // giving up eliminating the locks. The current code disallows any
1154 // conditional control flow between these operations. A formulation
1155 // similar to partial redundancy elimination computing the
1156 // availability of unlocking and the anticipatability of locking at a
1157 // program point would allow detection of fully redundant locking with
1158 // some amount of work in between. I'm not sure how often I really
1159 // think that would occur though. Most of the cases I've seen
1160 // indicate it's likely non-trivial work would occur in between.
1161 // There may be other more complicated constructs where we could
1162 // eliminate locking but I haven't seen any others appear as hot or
1163 // interesting.
1164 //
1165 // Locking and unlocking have a canonical form in ideal that looks
1166 // roughly like this:
1167 //
1168 // <obj>
1169 // | \\------+
1170 // | \ \
1171 // | BoxLock \
1172 // | | | \
1173 // | | \ \
1174 // | | FastLock
1175 // | | /
1176 // | | /
1177 // | | |
1178 //
1179 // Lock
1180 // |
1181 // Proj #0
1182 // |
1183 // MembarAcquire
1184 // |
1185 // Proj #0
1186 //
1187 // MembarRelease
1188 // |
1189 // Proj #0
1190 // |
1191 // Unlock
1192 // |
1193 // Proj #0
1194 //
1195 //
1196 // This code proceeds by processing Lock nodes during PhaseIterGVN
1197 // and searching back through its control for the proper code
1198 // patterns. Once it finds a set of lock and unlock operations to
1199 // eliminate they are marked as eliminatable which causes the
1200 // expansion of the Lock and Unlock macro nodes to make the operation a NOP
1201 //
1202 //=============================================================================
1203
1204 //
1205 // Utility function to skip over uninteresting control nodes. Nodes skipped are:
1206 // - copy regions. (These may not have been optimized away yet.)
1207 // - eliminated locking nodes
1208 //
1209 static Node *next_control(Node *ctrl) {
1210 if (ctrl == NULL)
1211 return NULL;
1212 while (1) {
1213 if (ctrl->is_Region()) {
1214 RegionNode *r = ctrl->as_Region();
1215 Node *n = r->is_copy();
1216 if (n == NULL)
1217 break; // hit a region, return it
1218 else
1219 ctrl = n;
1220 } else if (ctrl->is_Proj()) {
1221 Node *in0 = ctrl->in(0);
1222 if (in0->is_AbstractLock() && in0->as_AbstractLock()->is_eliminated()) {
1223 ctrl = in0->in(0);
1224 } else {
1225 break;
1226 }
1227 } else {
1228 break; // found an interesting control
1229 }
1230 }
1231 return ctrl;
1232 }
1233 //
1234 // Given a control, see if it's the control projection of an Unlock which
1235 // operating on the same object as lock.
1236 //
1237 bool AbstractLockNode::find_matching_unlock(const Node* ctrl, LockNode* lock,
1238 GrowableArray<AbstractLockNode*> &lock_ops) {
1239 ProjNode *ctrl_proj = (ctrl->is_Proj()) ? ctrl->as_Proj() : NULL;
1240 if (ctrl_proj != NULL && ctrl_proj->_con == TypeFunc::Control) {
1241 Node *n = ctrl_proj->in(0);
1242 if (n != NULL && n->is_Unlock()) {
1243 UnlockNode *unlock = n->as_Unlock();
1244 if ((lock->obj_node() == unlock->obj_node()) &&
1245 (lock->box_node() == unlock->box_node()) && !unlock->is_eliminated()) {
1246 lock_ops.append(unlock);
1247 return true;
1248 }
1249 }
1250 }
1251 return false;
1252 }
1253
1254 //
1255 // Find the lock matching an unlock. Returns null if a safepoint
1256 // or complicated control is encountered first.
1257 LockNode *AbstractLockNode::find_matching_lock(UnlockNode* unlock) {
1258 LockNode *lock_result = NULL;
1259 // find the matching lock, or an intervening safepoint
1260 Node *ctrl = next_control(unlock->in(0));
1261 while (1) {
1262 assert(ctrl != NULL, "invalid control graph");
1263 assert(!ctrl->is_Start(), "missing lock for unlock");
1264 if (ctrl->is_top()) break; // dead control path
1265 if (ctrl->is_Proj()) ctrl = ctrl->in(0);
1266 if (ctrl->is_SafePoint()) {
1267 break; // found a safepoint (may be the lock we are searching for)
1268 } else if (ctrl->is_Region()) {
1269 // Check for a simple diamond pattern. Punt on anything more complicated
1270 if (ctrl->req() == 3 && ctrl->in(1) != NULL && ctrl->in(2) != NULL) {
1271 Node *in1 = next_control(ctrl->in(1));
1272 Node *in2 = next_control(ctrl->in(2));
1273 if (((in1->is_IfTrue() && in2->is_IfFalse()) ||
1274 (in2->is_IfTrue() && in1->is_IfFalse())) && (in1->in(0) == in2->in(0))) {
1275 ctrl = next_control(in1->in(0)->in(0));
1276 } else {
1277 break;
1278 }
1279 } else {
1280 break;
1281 }
1282 } else {
1283 ctrl = next_control(ctrl->in(0)); // keep searching
1284 }
1285 }
1286 if (ctrl->is_Lock()) {
1287 LockNode *lock = ctrl->as_Lock();
1288 if ((lock->obj_node() == unlock->obj_node()) &&
1289 (lock->box_node() == unlock->box_node())) {
1290 lock_result = lock;
1291 }
1292 }
1293 return lock_result;
1294 }
1295
1296 // This code corresponds to case 3 above.
1297
1298 bool AbstractLockNode::find_lock_and_unlock_through_if(Node* node, LockNode* lock,
1299 GrowableArray<AbstractLockNode*> &lock_ops) {
1300 Node* if_node = node->in(0);
1301 bool if_true = node->is_IfTrue();
1302
1303 if (if_node->is_If() && if_node->outcnt() == 2 && (if_true || node->is_IfFalse())) {
1304 Node *lock_ctrl = next_control(if_node->in(0));
1305 if (find_matching_unlock(lock_ctrl, lock, lock_ops)) {
1306 Node* lock1_node = NULL;
1307 ProjNode* proj = if_node->as_If()->proj_out(!if_true);
1308 if (if_true) {
1309 if (proj->is_IfFalse() && proj->outcnt() == 1) {
1310 lock1_node = proj->unique_out();
1311 }
1312 } else {
1313 if (proj->is_IfTrue() && proj->outcnt() == 1) {
1314 lock1_node = proj->unique_out();
1315 }
1316 }
1317 if (lock1_node != NULL && lock1_node->is_Lock()) {
1318 LockNode *lock1 = lock1_node->as_Lock();
1319 if ((lock->obj_node() == lock1->obj_node()) &&
1320 (lock->box_node() == lock1->box_node()) && !lock1->is_eliminated()) {
1321 lock_ops.append(lock1);
1322 return true;
1323 }
1324 }
1325 }
1326 }
1327
1328 lock_ops.trunc_to(0);
1329 return false;
1330 }
1331
1332 bool AbstractLockNode::find_unlocks_for_region(const RegionNode* region, LockNode* lock,
1333 GrowableArray<AbstractLockNode*> &lock_ops) {
1334 // check each control merging at this point for a matching unlock.
1335 // in(0) should be self edge so skip it.
1336 for (int i = 1; i < (int)region->req(); i++) {
1337 Node *in_node = next_control(region->in(i));
1338 if (in_node != NULL) {
1339 if (find_matching_unlock(in_node, lock, lock_ops)) {
1340 // found a match so keep on checking.
1341 continue;
1342 } else if (find_lock_and_unlock_through_if(in_node, lock, lock_ops)) {
1343 continue;
1344 }
1345
1346 // If we fall through to here then it was some kind of node we
1347 // don't understand or there wasn't a matching unlock, so give
1348 // up trying to merge locks.
1349 lock_ops.trunc_to(0);
1350 return false;
1351 }
1352 }
1353 return true;
1354
1355 }
1356
1357 #ifndef PRODUCT
1358 //
1359 // Create a counter which counts the number of times this lock is acquired
1360 //
1361 void AbstractLockNode::create_lock_counter(JVMState* state) {
1362 _counter = OptoRuntime::new_named_counter(state, NamedCounter::LockCounter);
1363 }
1364 #endif
1365
1366 void AbstractLockNode::set_eliminated() {
1367 _eliminate = true;
1368 #ifndef PRODUCT
1369 if (_counter) {
1370 // Update the counter to indicate that this lock was eliminated.
1371 // The counter update code will stay around even though the
1372 // optimizer will eliminate the lock operation itself.
1373 _counter->set_tag(NamedCounter::EliminatedLockCounter);
1374 }
1375 #endif
1376 }
1377
1378 //=============================================================================
1379 Node *LockNode::Ideal(PhaseGVN *phase, bool can_reshape) {
1380
1381 // perform any generic optimizations first (returns 'this' or NULL)
1382 Node *result = SafePointNode::Ideal(phase, can_reshape);
1383
1384 // Now see if we can optimize away this lock. We don't actually
1385 // remove the locking here, we simply set the _eliminate flag which
1386 // prevents macro expansion from expanding the lock. Since we don't
1387 // modify the graph, the value returned from this function is the
1388 // one computed above.
1389 if (result == NULL && can_reshape && EliminateLocks && !is_eliminated()) {
1390 //
1391 // If we are locking an unescaped object, the lock/unlock is unnecessary
1392 //
1393 ConnectionGraph *cgr = phase->C->congraph();
1394 PointsToNode::EscapeState es = PointsToNode::GlobalEscape;
1395 if (cgr != NULL)
1396 es = cgr->escape_state(obj_node(), phase);
1397 if (es != PointsToNode::UnknownEscape && es != PointsToNode::GlobalEscape) {
1398 // Mark it eliminated to update any counters
1399 this->set_eliminated();
1400 return result;
1401 }
1402
1403 //
1404 // Try lock coarsening
1405 //
1406 PhaseIterGVN* iter = phase->is_IterGVN();
1407 if (iter != NULL) {
1408
1409 GrowableArray<AbstractLockNode*> lock_ops;
1410
1411 Node *ctrl = next_control(in(0));
1412
1413 // now search back for a matching Unlock
1414 if (find_matching_unlock(ctrl, this, lock_ops)) {
1415 // found an unlock directly preceding this lock. This is the
1416 // case of single unlock directly control dependent on a
1417 // single lock which is the trivial version of case 1 or 2.
1418 } else if (ctrl->is_Region() ) {
1419 if (find_unlocks_for_region(ctrl->as_Region(), this, lock_ops)) {
1420 // found lock preceded by multiple unlocks along all paths
1421 // joining at this point which is case 3 in description above.
1422 }
1423 } else {
1424 // see if this lock comes from either half of an if and the
1425 // predecessors merges unlocks and the other half of the if
1426 // performs a lock.
1427 if (find_lock_and_unlock_through_if(ctrl, this, lock_ops)) {
1428 // found unlock splitting to an if with locks on both branches.
1429 }
1430 }
1431
1432 if (lock_ops.length() > 0) {
1433 // add ourselves to the list of locks to be eliminated.
1434 lock_ops.append(this);
1435
1436 #ifndef PRODUCT
1437 if (PrintEliminateLocks) {
1438 int locks = 0;
1439 int unlocks = 0;
1440 for (int i = 0; i < lock_ops.length(); i++) {
1441 AbstractLockNode* lock = lock_ops.at(i);
1442 if (lock->Opcode() == Op_Lock)
1443 locks++;
1444 else
1445 unlocks++;
1446 if (Verbose) {
1447 lock->dump(1);
1448 }
1449 }
1450 tty->print_cr("***Eliminated %d unlocks and %d locks", unlocks, locks);
1451 }
1452 #endif
1453
1454 // for each of the identified locks, mark them
1455 // as eliminatable
1456 for (int i = 0; i < lock_ops.length(); i++) {
1457 AbstractLockNode* lock = lock_ops.at(i);
1458
1459 // Mark it eliminated to update any counters
1460 lock->set_eliminated();
1461 lock->set_coarsened();
1462 }
1463 } else if (result != NULL && ctrl->is_Region() &&
1464 iter->_worklist.member(ctrl)) {
1465 // We weren't able to find any opportunities but the region this
1466 // lock is control dependent on hasn't been processed yet so put
1467 // this lock back on the worklist so we can check again once any
1468 // region simplification has occurred.
1469 iter->_worklist.push(this);
1470 }
1471 }
1472 }
1473
1474 return result;
1475 }
1476
1477 //=============================================================================
1478 uint UnlockNode::size_of() const { return sizeof(*this); }
1479
1480 //=============================================================================
1481 Node *UnlockNode::Ideal(PhaseGVN *phase, bool can_reshape) {
1482
1483 // perform any generic optimizations first (returns 'this' or NULL)
1484 Node * result = SafePointNode::Ideal(phase, can_reshape);
1485
1486 // Now see if we can optimize away this unlock. We don't actually
1487 // remove the unlocking here, we simply set the _eliminate flag which
1488 // prevents macro expansion from expanding the unlock. Since we don't
1489 // modify the graph, the value returned from this function is the
1490 // one computed above.
1491 // Escape state is defined after Parse phase.
1492 if (result == NULL && can_reshape && EliminateLocks && !is_eliminated()) {
1493 //
1494 // If we are unlocking an unescaped object, the lock/unlock is unnecessary.
1495 //
1496 ConnectionGraph *cgr = phase->C->congraph();
1497 PointsToNode::EscapeState es = PointsToNode::GlobalEscape;
1498 if (cgr != NULL)
1499 es = cgr->escape_state(obj_node(), phase);
1500 if (es != PointsToNode::UnknownEscape && es != PointsToNode::GlobalEscape) {
1501 // Mark it eliminated to update any counters
1502 this->set_eliminated();
1503 }
1504 }
1505 return result;
1506 }