1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "ci/bcEscapeAnalyzer.hpp"
27 #include "compiler/oopMap.hpp"
28 #include "opto/callGenerator.hpp"
29 #include "opto/callnode.hpp"
30 #include "opto/escape.hpp"
31 #include "opto/locknode.hpp"
32 #include "opto/machnode.hpp"
33 #include "opto/matcher.hpp"
34 #include "opto/parse.hpp"
35 #include "opto/regalloc.hpp"
36 #include "opto/regmask.hpp"
37 #include "opto/rootnode.hpp"
38 #include "opto/runtime.hpp"
39
40 // Portions of code courtesy of Clifford Click
41
42 // Optimization - Graph Style
43
44 //=============================================================================
45 uint StartNode::size_of() const { return sizeof(*this); }
46 uint StartNode::cmp( const Node &n ) const
47 { return _domain == ((StartNode&)n)._domain; }
48 const Type *StartNode::bottom_type() const { return _domain; }
49 const Type *StartNode::Value(PhaseTransform *phase) const { return _domain; }
50 #ifndef PRODUCT
51 void StartNode::dump_spec(outputStream *st) const { st->print(" #"); _domain->dump_on(st);}
52 #endif
53
54 //------------------------------Ideal------------------------------------------
55 Node *StartNode::Ideal(PhaseGVN *phase, bool can_reshape){
56 return remove_dead_region(phase, can_reshape) ? this : NULL;
57 }
58
59 //------------------------------calling_convention-----------------------------
60 void StartNode::calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const {
61 Matcher::calling_convention( sig_bt, parm_regs, argcnt, false );
62 }
63
64 //------------------------------Registers--------------------------------------
65 const RegMask &StartNode::in_RegMask(uint) const {
66 return RegMask::Empty;
67 }
68
69 //------------------------------match------------------------------------------
70 // Construct projections for incoming parameters, and their RegMask info
71 Node *StartNode::match( const ProjNode *proj, const Matcher *match ) {
72 switch (proj->_con) {
73 case TypeFunc::Control:
74 case TypeFunc::I_O:
75 case TypeFunc::Memory:
76 return new (match->C) MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj);
77 case TypeFunc::FramePtr:
78 return new (match->C) MachProjNode(this,proj->_con,Matcher::c_frame_ptr_mask, Op_RegP);
79 case TypeFunc::ReturnAdr:
80 return new (match->C) MachProjNode(this,proj->_con,match->_return_addr_mask,Op_RegP);
81 case TypeFunc::Parms:
82 default: {
83 uint parm_num = proj->_con - TypeFunc::Parms;
84 const Type *t = _domain->field_at(proj->_con);
85 if (t->base() == Type::Half) // 2nd half of Longs and Doubles
86 return new (match->C) ConNode(Type::TOP);
87 uint ideal_reg = t->ideal_reg();
88 RegMask &rm = match->_calling_convention_mask[parm_num];
89 return new (match->C) MachProjNode(this,proj->_con,rm,ideal_reg);
90 }
91 }
92 return NULL;
93 }
94
95 //------------------------------StartOSRNode----------------------------------
96 // The method start node for an on stack replacement adapter
97
98 //------------------------------osr_domain-----------------------------
99 const TypeTuple *StartOSRNode::osr_domain() {
100 const Type **fields = TypeTuple::fields(2);
101 fields[TypeFunc::Parms+0] = TypeRawPtr::BOTTOM; // address of osr buffer
102
103 return TypeTuple::make(TypeFunc::Parms+1, fields);
104 }
105
106 //=============================================================================
107 const char * const ParmNode::names[TypeFunc::Parms+1] = {
108 "Control", "I_O", "Memory", "FramePtr", "ReturnAdr", "Parms"
109 };
110
111 #ifndef PRODUCT
112 void ParmNode::dump_spec(outputStream *st) const {
113 if( _con < TypeFunc::Parms ) {
114 st->print(names[_con]);
115 } else {
116 st->print("Parm%d: ",_con-TypeFunc::Parms);
117 // Verbose and WizardMode dump bottom_type for all nodes
118 if( !Verbose && !WizardMode ) bottom_type()->dump_on(st);
119 }
120 }
121 #endif
122
123 uint ParmNode::ideal_reg() const {
124 switch( _con ) {
125 case TypeFunc::Control : // fall through
126 case TypeFunc::I_O : // fall through
127 case TypeFunc::Memory : return 0;
128 case TypeFunc::FramePtr : // fall through
129 case TypeFunc::ReturnAdr: return Op_RegP;
130 default : assert( _con > TypeFunc::Parms, "" );
131 // fall through
132 case TypeFunc::Parms : {
133 // Type of argument being passed
134 const Type *t = in(0)->as_Start()->_domain->field_at(_con);
135 return t->ideal_reg();
136 }
137 }
138 ShouldNotReachHere();
139 return 0;
140 }
141
142 //=============================================================================
143 ReturnNode::ReturnNode(uint edges, Node *cntrl, Node *i_o, Node *memory, Node *frameptr, Node *retadr ) : Node(edges) {
144 init_req(TypeFunc::Control,cntrl);
145 init_req(TypeFunc::I_O,i_o);
146 init_req(TypeFunc::Memory,memory);
147 init_req(TypeFunc::FramePtr,frameptr);
148 init_req(TypeFunc::ReturnAdr,retadr);
149 }
150
151 Node *ReturnNode::Ideal(PhaseGVN *phase, bool can_reshape){
152 return remove_dead_region(phase, can_reshape) ? this : NULL;
153 }
154
155 const Type *ReturnNode::Value( PhaseTransform *phase ) const {
156 return ( phase->type(in(TypeFunc::Control)) == Type::TOP)
157 ? Type::TOP
158 : Type::BOTTOM;
159 }
160
161 // Do we Match on this edge index or not? No edges on return nodes
162 uint ReturnNode::match_edge(uint idx) const {
163 return 0;
164 }
165
166
167 #ifndef PRODUCT
168 void ReturnNode::dump_req(outputStream *st) const {
169 // Dump the required inputs, enclosed in '(' and ')'
170 uint i; // Exit value of loop
171 for (i = 0; i < req(); i++) { // For all required inputs
172 if (i == TypeFunc::Parms) st->print("returns");
173 if (in(i)) st->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx);
174 else st->print("_ ");
175 }
176 }
177 #endif
178
179 //=============================================================================
180 RethrowNode::RethrowNode(
181 Node* cntrl,
182 Node* i_o,
183 Node* memory,
184 Node* frameptr,
185 Node* ret_adr,
186 Node* exception
187 ) : Node(TypeFunc::Parms + 1) {
188 init_req(TypeFunc::Control , cntrl );
189 init_req(TypeFunc::I_O , i_o );
190 init_req(TypeFunc::Memory , memory );
191 init_req(TypeFunc::FramePtr , frameptr );
192 init_req(TypeFunc::ReturnAdr, ret_adr);
193 init_req(TypeFunc::Parms , exception);
194 }
195
196 Node *RethrowNode::Ideal(PhaseGVN *phase, bool can_reshape){
197 return remove_dead_region(phase, can_reshape) ? this : NULL;
198 }
199
200 const Type *RethrowNode::Value( PhaseTransform *phase ) const {
201 return (phase->type(in(TypeFunc::Control)) == Type::TOP)
202 ? Type::TOP
203 : Type::BOTTOM;
204 }
205
206 uint RethrowNode::match_edge(uint idx) const {
207 return 0;
208 }
209
210 #ifndef PRODUCT
211 void RethrowNode::dump_req(outputStream *st) const {
212 // Dump the required inputs, enclosed in '(' and ')'
213 uint i; // Exit value of loop
214 for (i = 0; i < req(); i++) { // For all required inputs
215 if (i == TypeFunc::Parms) st->print("exception");
216 if (in(i)) st->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx);
217 else st->print("_ ");
218 }
219 }
220 #endif
221
222 //=============================================================================
223 // Do we Match on this edge index or not? Match only target address & method
224 uint TailCallNode::match_edge(uint idx) const {
225 return TypeFunc::Parms <= idx && idx <= TypeFunc::Parms+1;
226 }
227
228 //=============================================================================
229 // Do we Match on this edge index or not? Match only target address & oop
230 uint TailJumpNode::match_edge(uint idx) const {
231 return TypeFunc::Parms <= idx && idx <= TypeFunc::Parms+1;
232 }
233
234 //=============================================================================
235 JVMState::JVMState(ciMethod* method, JVMState* caller) :
236 _method(method) {
237 assert(method != NULL, "must be valid call site");
238 _reexecute = Reexecute_Undefined;
239 debug_only(_bci = -99); // random garbage value
240 debug_only(_map = (SafePointNode*)-1);
241 _caller = caller;
242 _depth = 1 + (caller == NULL ? 0 : caller->depth());
243 _locoff = TypeFunc::Parms;
244 _stkoff = _locoff + _method->max_locals();
245 _monoff = _stkoff + _method->max_stack();
246 _scloff = _monoff;
247 _endoff = _monoff;
248 _sp = 0;
249 }
250 JVMState::JVMState(int stack_size) :
251 _method(NULL) {
252 _bci = InvocationEntryBci;
253 _reexecute = Reexecute_Undefined;
254 debug_only(_map = (SafePointNode*)-1);
255 _caller = NULL;
256 _depth = 1;
257 _locoff = TypeFunc::Parms;
258 _stkoff = _locoff;
259 _monoff = _stkoff + stack_size;
260 _scloff = _monoff;
261 _endoff = _monoff;
262 _sp = 0;
263 }
264
265 //--------------------------------of_depth-------------------------------------
266 JVMState* JVMState::of_depth(int d) const {
267 const JVMState* jvmp = this;
268 assert(0 < d && (uint)d <= depth(), "oob");
269 for (int skip = depth() - d; skip > 0; skip--) {
270 jvmp = jvmp->caller();
271 }
272 assert(jvmp->depth() == (uint)d, "found the right one");
273 return (JVMState*)jvmp;
274 }
275
276 //-----------------------------same_calls_as-----------------------------------
277 bool JVMState::same_calls_as(const JVMState* that) const {
278 if (this == that) return true;
279 if (this->depth() != that->depth()) return false;
280 const JVMState* p = this;
281 const JVMState* q = that;
282 for (;;) {
283 if (p->_method != q->_method) return false;
284 if (p->_method == NULL) return true; // bci is irrelevant
285 if (p->_bci != q->_bci) return false;
286 if (p->_reexecute != q->_reexecute) return false;
287 p = p->caller();
288 q = q->caller();
289 if (p == q) return true;
290 assert(p != NULL && q != NULL, "depth check ensures we don't run off end");
291 }
292 }
293
294 //------------------------------debug_start------------------------------------
295 uint JVMState::debug_start() const {
296 debug_only(JVMState* jvmroot = of_depth(1));
297 assert(jvmroot->locoff() <= this->locoff(), "youngest JVMState must be last");
298 return of_depth(1)->locoff();
299 }
300
301 //-------------------------------debug_end-------------------------------------
302 uint JVMState::debug_end() const {
303 debug_only(JVMState* jvmroot = of_depth(1));
304 assert(jvmroot->endoff() <= this->endoff(), "youngest JVMState must be last");
305 return endoff();
306 }
307
308 //------------------------------debug_depth------------------------------------
309 uint JVMState::debug_depth() const {
310 uint total = 0;
311 for (const JVMState* jvmp = this; jvmp != NULL; jvmp = jvmp->caller()) {
312 total += jvmp->debug_size();
313 }
314 return total;
315 }
316
317 #ifndef PRODUCT
318
319 //------------------------------format_helper----------------------------------
320 // Given an allocation (a Chaitin object) and a Node decide if the Node carries
321 // any defined value or not. If it does, print out the register or constant.
322 static void format_helper( PhaseRegAlloc *regalloc, outputStream* st, Node *n, const char *msg, uint i, GrowableArray<SafePointScalarObjectNode*> *scobjs ) {
323 if (n == NULL) { st->print(" NULL"); return; }
324 if (n->is_SafePointScalarObject()) {
325 // Scalar replacement.
326 SafePointScalarObjectNode* spobj = n->as_SafePointScalarObject();
327 scobjs->append_if_missing(spobj);
328 int sco_n = scobjs->find(spobj);
329 assert(sco_n >= 0, "");
330 st->print(" %s%d]=#ScObj" INT32_FORMAT, msg, i, sco_n);
331 return;
332 }
333 if (regalloc->node_regs_max_index() > 0 &&
334 OptoReg::is_valid(regalloc->get_reg_first(n))) { // Check for undefined
335 char buf[50];
336 regalloc->dump_register(n,buf);
337 st->print(" %s%d]=%s",msg,i,buf);
338 } else { // No register, but might be constant
339 const Type *t = n->bottom_type();
340 switch (t->base()) {
341 case Type::Int:
342 st->print(" %s%d]=#"INT32_FORMAT,msg,i,t->is_int()->get_con());
343 break;
344 case Type::AnyPtr:
345 assert( t == TypePtr::NULL_PTR, "" );
346 st->print(" %s%d]=#NULL",msg,i);
347 break;
348 case Type::AryPtr:
349 case Type::InstPtr:
350 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,t->isa_oopptr()->const_oop());
351 break;
352 case Type::KlassPtr:
353 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,t->make_ptr()->isa_klassptr()->klass());
354 break;
355 case Type::MetadataPtr:
356 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,t->make_ptr()->isa_metadataptr()->metadata());
357 break;
358 case Type::NarrowOop:
359 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,t->make_ptr()->isa_oopptr()->const_oop());
360 break;
361 case Type::RawPtr:
362 st->print(" %s%d]=#Raw" INTPTR_FORMAT,msg,i,t->is_rawptr());
363 break;
364 case Type::DoubleCon:
365 st->print(" %s%d]=#%fD",msg,i,t->is_double_constant()->_d);
366 break;
367 case Type::FloatCon:
368 st->print(" %s%d]=#%fF",msg,i,t->is_float_constant()->_f);
369 break;
370 case Type::Long:
371 st->print(" %s%d]=#"INT64_FORMAT,msg,i,t->is_long()->get_con());
372 break;
373 case Type::Half:
374 case Type::Top:
375 st->print(" %s%d]=_",msg,i);
376 break;
377 default: ShouldNotReachHere();
378 }
379 }
380 }
381
382 //------------------------------format-----------------------------------------
383 void JVMState::format(PhaseRegAlloc *regalloc, const Node *n, outputStream* st) const {
384 st->print(" #");
385 if (_method) {
386 _method->print_short_name(st);
387 st->print(" @ bci:%d ",_bci);
388 } else {
389 st->print_cr(" runtime stub ");
390 return;
391 }
392 if (n->is_MachSafePoint()) {
393 GrowableArray<SafePointScalarObjectNode*> scobjs;
394 MachSafePointNode *mcall = n->as_MachSafePoint();
395 uint i;
396 // Print locals
397 for (i = 0; i < (uint)loc_size(); i++)
398 format_helper(regalloc, st, mcall->local(this, i), "L[", i, &scobjs);
399 // Print stack
400 for (i = 0; i < (uint)stk_size(); i++) {
401 if ((uint)(_stkoff + i) >= mcall->len())
402 st->print(" oob ");
403 else
404 format_helper(regalloc, st, mcall->stack(this, i), "STK[", i, &scobjs);
405 }
406 for (i = 0; (int)i < nof_monitors(); i++) {
407 Node *box = mcall->monitor_box(this, i);
408 Node *obj = mcall->monitor_obj(this, i);
409 if (regalloc->node_regs_max_index() > 0 &&
410 OptoReg::is_valid(regalloc->get_reg_first(box))) {
411 box = BoxLockNode::box_node(box);
412 format_helper(regalloc, st, box, "MON-BOX[", i, &scobjs);
413 } else {
414 OptoReg::Name box_reg = BoxLockNode::reg(box);
415 st->print(" MON-BOX%d=%s+%d",
416 i,
417 OptoReg::regname(OptoReg::c_frame_pointer),
418 regalloc->reg2offset(box_reg));
419 }
420 const char* obj_msg = "MON-OBJ[";
421 if (EliminateLocks) {
422 if (BoxLockNode::box_node(box)->is_eliminated())
423 obj_msg = "MON-OBJ(LOCK ELIMINATED)[";
424 }
425 format_helper(regalloc, st, obj, obj_msg, i, &scobjs);
426 }
427
428 for (i = 0; i < (uint)scobjs.length(); i++) {
429 // Scalar replaced objects.
430 st->print_cr("");
431 st->print(" # ScObj" INT32_FORMAT " ", i);
432 SafePointScalarObjectNode* spobj = scobjs.at(i);
433 ciKlass* cik = spobj->bottom_type()->is_oopptr()->klass();
434 assert(cik->is_instance_klass() ||
435 cik->is_array_klass(), "Not supported allocation.");
436 ciInstanceKlass *iklass = NULL;
437 if (cik->is_instance_klass()) {
438 cik->print_name_on(st);
439 iklass = cik->as_instance_klass();
440 } else if (cik->is_type_array_klass()) {
441 cik->as_array_klass()->base_element_type()->print_name_on(st);
442 st->print("[%d]", spobj->n_fields());
443 } else if (cik->is_obj_array_klass()) {
444 ciKlass* cie = cik->as_obj_array_klass()->base_element_klass();
445 if (cie->is_instance_klass()) {
446 cie->print_name_on(st);
447 } else if (cie->is_type_array_klass()) {
448 cie->as_array_klass()->base_element_type()->print_name_on(st);
449 } else {
450 ShouldNotReachHere();
451 }
452 st->print("[%d]", spobj->n_fields());
453 int ndim = cik->as_array_klass()->dimension() - 1;
454 while (ndim-- > 0) {
455 st->print("[]");
456 }
457 }
458 st->print("={");
459 uint nf = spobj->n_fields();
460 if (nf > 0) {
461 uint first_ind = spobj->first_index(mcall->jvms());
462 Node* fld_node = mcall->in(first_ind);
463 ciField* cifield;
464 if (iklass != NULL) {
465 st->print(" [");
466 cifield = iklass->nonstatic_field_at(0);
467 cifield->print_name_on(st);
468 format_helper(regalloc, st, fld_node, ":", 0, &scobjs);
469 } else {
470 format_helper(regalloc, st, fld_node, "[", 0, &scobjs);
471 }
472 for (uint j = 1; j < nf; j++) {
473 fld_node = mcall->in(first_ind+j);
474 if (iklass != NULL) {
475 st->print(", [");
476 cifield = iklass->nonstatic_field_at(j);
477 cifield->print_name_on(st);
478 format_helper(regalloc, st, fld_node, ":", j, &scobjs);
479 } else {
480 format_helper(regalloc, st, fld_node, ", [", j, &scobjs);
481 }
482 }
483 }
484 st->print(" }");
485 }
486 }
487 st->print_cr("");
488 if (caller() != NULL) caller()->format(regalloc, n, st);
489 }
490
491
492 void JVMState::dump_spec(outputStream *st) const {
493 if (_method != NULL) {
494 bool printed = false;
495 if (!Verbose) {
496 // The JVMS dumps make really, really long lines.
497 // Take out the most boring parts, which are the package prefixes.
498 char buf[500];
499 stringStream namest(buf, sizeof(buf));
500 _method->print_short_name(&namest);
501 if (namest.count() < sizeof(buf)) {
502 const char* name = namest.base();
503 if (name[0] == ' ') ++name;
504 const char* endcn = strchr(name, ':'); // end of class name
505 if (endcn == NULL) endcn = strchr(name, '(');
506 if (endcn == NULL) endcn = name + strlen(name);
507 while (endcn > name && endcn[-1] != '.' && endcn[-1] != '/')
508 --endcn;
509 st->print(" %s", endcn);
510 printed = true;
511 }
512 }
513 if (!printed)
514 _method->print_short_name(st);
515 st->print(" @ bci:%d",_bci);
516 if(_reexecute == Reexecute_True)
517 st->print(" reexecute");
518 } else {
519 st->print(" runtime stub");
520 }
521 if (caller() != NULL) caller()->dump_spec(st);
522 }
523
524
525 void JVMState::dump_on(outputStream* st) const {
526 bool print_map = _map && !((uintptr_t)_map & 1) &&
527 ((caller() == NULL) || (caller()->map() != _map));
528 if (print_map) {
529 if (_map->len() > _map->req()) { // _map->has_exceptions()
530 Node* ex = _map->in(_map->req()); // _map->next_exception()
531 // skip the first one; it's already being printed
532 while (ex != NULL && ex->len() > ex->req()) {
533 ex = ex->in(ex->req()); // ex->next_exception()
534 ex->dump(1);
535 }
536 }
537 _map->dump(Verbose ? 2 : 1);
538 }
539 if (caller() != NULL) {
540 caller()->dump_on(st);
541 }
542 st->print("JVMS depth=%d loc=%d stk=%d arg=%d mon=%d scalar=%d end=%d mondepth=%d sp=%d bci=%d reexecute=%s method=",
543 depth(), locoff(), stkoff(), argoff(), monoff(), scloff(), endoff(), monitor_depth(), sp(), bci(), should_reexecute()?"true":"false");
544 if (_method == NULL) {
545 st->print_cr("(none)");
546 } else {
547 _method->print_name(st);
548 st->cr();
549 if (bci() >= 0 && bci() < _method->code_size()) {
550 st->print(" bc: ");
551 _method->print_codes_on(bci(), bci()+1, st);
552 }
553 }
554 }
555
556 // Extra way to dump a jvms from the debugger,
557 // to avoid a bug with C++ member function calls.
558 void dump_jvms(JVMState* jvms) {
559 jvms->dump();
560 }
561 #endif
562
563 //--------------------------clone_shallow--------------------------------------
564 JVMState* JVMState::clone_shallow(Compile* C) const {
565 JVMState* n = has_method() ? new (C) JVMState(_method, _caller) : new (C) JVMState(0);
566 n->set_bci(_bci);
567 n->_reexecute = _reexecute;
568 n->set_locoff(_locoff);
569 n->set_stkoff(_stkoff);
570 n->set_monoff(_monoff);
571 n->set_scloff(_scloff);
572 n->set_endoff(_endoff);
573 n->set_sp(_sp);
574 n->set_map(_map);
575 return n;
576 }
577
578 //---------------------------clone_deep----------------------------------------
579 JVMState* JVMState::clone_deep(Compile* C) const {
580 JVMState* n = clone_shallow(C);
581 for (JVMState* p = n; p->_caller != NULL; p = p->_caller) {
582 p->_caller = p->_caller->clone_shallow(C);
583 }
584 assert(n->depth() == depth(), "sanity");
585 assert(n->debug_depth() == debug_depth(), "sanity");
586 return n;
587 }
588
589 /**
590 * Reset map for all callers
591 */
592 void JVMState::set_map_deep(SafePointNode* map) {
593 for (JVMState* p = this; p->_caller != NULL; p = p->_caller) {
594 p->set_map(map);
595 }
596 }
597
598 //=============================================================================
599 uint CallNode::cmp( const Node &n ) const
600 { return _tf == ((CallNode&)n)._tf && _jvms == ((CallNode&)n)._jvms; }
601 #ifndef PRODUCT
602 void CallNode::dump_req(outputStream *st) const {
603 // Dump the required inputs, enclosed in '(' and ')'
604 uint i; // Exit value of loop
605 for (i = 0; i < req(); i++) { // For all required inputs
606 if (i == TypeFunc::Parms) st->print("(");
607 if (in(i)) st->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx);
608 else st->print("_ ");
609 }
610 st->print(")");
611 }
612
613 void CallNode::dump_spec(outputStream *st) const {
614 st->print(" ");
615 tf()->dump_on(st);
616 if (_cnt != COUNT_UNKNOWN) st->print(" C=%f",_cnt);
617 if (jvms() != NULL) jvms()->dump_spec(st);
618 }
619 #endif
620
621 const Type *CallNode::bottom_type() const { return tf()->range(); }
622 const Type *CallNode::Value(PhaseTransform *phase) const {
623 if (phase->type(in(0)) == Type::TOP) return Type::TOP;
624 return tf()->range();
625 }
626
627 //------------------------------calling_convention-----------------------------
628 void CallNode::calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const {
629 // Use the standard compiler calling convention
630 Matcher::calling_convention( sig_bt, parm_regs, argcnt, true );
631 }
632
633
634 //------------------------------match------------------------------------------
635 // Construct projections for control, I/O, memory-fields, ..., and
636 // return result(s) along with their RegMask info
637 Node *CallNode::match( const ProjNode *proj, const Matcher *match ) {
638 switch (proj->_con) {
639 case TypeFunc::Control:
640 case TypeFunc::I_O:
641 case TypeFunc::Memory:
642 return new (match->C) MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj);
643
644 case TypeFunc::Parms+1: // For LONG & DOUBLE returns
645 assert(tf()->_range->field_at(TypeFunc::Parms+1) == Type::HALF, "");
646 // 2nd half of doubles and longs
647 return new (match->C) MachProjNode(this,proj->_con, RegMask::Empty, (uint)OptoReg::Bad);
648
649 case TypeFunc::Parms: { // Normal returns
650 uint ideal_reg = tf()->range()->field_at(TypeFunc::Parms)->ideal_reg();
651 OptoRegPair regs = is_CallRuntime()
652 ? match->c_return_value(ideal_reg,true) // Calls into C runtime
653 : match-> return_value(ideal_reg,true); // Calls into compiled Java code
654 RegMask rm = RegMask(regs.first());
655 if( OptoReg::is_valid(regs.second()) )
656 rm.Insert( regs.second() );
657 return new (match->C) MachProjNode(this,proj->_con,rm,ideal_reg);
658 }
659
660 case TypeFunc::ReturnAdr:
661 case TypeFunc::FramePtr:
662 default:
663 ShouldNotReachHere();
664 }
665 return NULL;
666 }
667
668 // Do we Match on this edge index or not? Match no edges
669 uint CallNode::match_edge(uint idx) const {
670 return 0;
671 }
672
673 //
674 // Determine whether the call could modify the field of the specified
675 // instance at the specified offset.
676 //
677 bool CallNode::may_modify(const TypeOopPtr *t_oop, PhaseTransform *phase) {
678 assert((t_oop != NULL), "sanity");
679 if (t_oop->is_known_instance()) {
680 // The instance_id is set only for scalar-replaceable allocations which
681 // are not passed as arguments according to Escape Analysis.
682 return false;
683 }
684 if (t_oop->is_ptr_to_boxed_value()) {
685 ciKlass* boxing_klass = t_oop->klass();
686 if (is_CallStaticJava() && as_CallStaticJava()->is_boxing_method()) {
687 // Skip unrelated boxing methods.
688 Node* proj = proj_out(TypeFunc::Parms);
689 if ((proj == NULL) || (phase->type(proj)->is_instptr()->klass() != boxing_klass)) {
690 return false;
691 }
692 }
693 if (is_CallJava() && as_CallJava()->method() != NULL) {
694 ciMethod* meth = as_CallJava()->method();
695 if (meth->is_accessor()) {
696 return false;
697 }
698 // May modify (by reflection) if an boxing object is passed
699 // as argument or returned.
700 if (returns_pointer() && (proj_out(TypeFunc::Parms) != NULL)) {
701 Node* proj = proj_out(TypeFunc::Parms);
702 const TypeInstPtr* inst_t = phase->type(proj)->isa_instptr();
703 if ((inst_t != NULL) && (!inst_t->klass_is_exact() ||
704 (inst_t->klass() == boxing_klass))) {
705 return true;
706 }
707 }
708 const TypeTuple* d = tf()->domain();
709 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) {
710 const TypeInstPtr* inst_t = d->field_at(i)->isa_instptr();
711 if ((inst_t != NULL) && (!inst_t->klass_is_exact() ||
712 (inst_t->klass() == boxing_klass))) {
713 return true;
714 }
715 }
716 return false;
717 }
718 }
719 return true;
720 }
721
722 // Does this call have a direct reference to n other than debug information?
723 bool CallNode::has_non_debug_use(Node *n) {
724 const TypeTuple * d = tf()->domain();
725 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) {
726 Node *arg = in(i);
727 if (arg == n) {
728 return true;
729 }
730 }
731 return false;
732 }
733
734 // Returns the unique CheckCastPP of a call
735 // or 'this' if there are several CheckCastPP
736 // or returns NULL if there is no one.
737 Node *CallNode::result_cast() {
738 Node *cast = NULL;
739
740 Node *p = proj_out(TypeFunc::Parms);
741 if (p == NULL)
742 return NULL;
743
744 for (DUIterator_Fast imax, i = p->fast_outs(imax); i < imax; i++) {
745 Node *use = p->fast_out(i);
746 if (use->is_CheckCastPP()) {
747 if (cast != NULL) {
748 return this; // more than 1 CheckCastPP
749 }
750 cast = use;
751 }
752 }
753 return cast;
754 }
755
756
757 void CallNode::extract_projections(CallProjections* projs, bool separate_io_proj) {
758 projs->fallthrough_proj = NULL;
759 projs->fallthrough_catchproj = NULL;
760 projs->fallthrough_ioproj = NULL;
761 projs->catchall_ioproj = NULL;
762 projs->catchall_catchproj = NULL;
763 projs->fallthrough_memproj = NULL;
764 projs->catchall_memproj = NULL;
765 projs->resproj = NULL;
766 projs->exobj = NULL;
767
768 for (DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++) {
769 ProjNode *pn = fast_out(i)->as_Proj();
770 if (pn->outcnt() == 0) continue;
771 switch (pn->_con) {
772 case TypeFunc::Control:
773 {
774 // For Control (fallthrough) and I_O (catch_all_index) we have CatchProj -> Catch -> Proj
775 projs->fallthrough_proj = pn;
776 DUIterator_Fast jmax, j = pn->fast_outs(jmax);
777 const Node *cn = pn->fast_out(j);
778 if (cn->is_Catch()) {
779 ProjNode *cpn = NULL;
780 for (DUIterator_Fast kmax, k = cn->fast_outs(kmax); k < kmax; k++) {
781 cpn = cn->fast_out(k)->as_Proj();
782 assert(cpn->is_CatchProj(), "must be a CatchProjNode");
783 if (cpn->_con == CatchProjNode::fall_through_index)
784 projs->fallthrough_catchproj = cpn;
785 else {
786 assert(cpn->_con == CatchProjNode::catch_all_index, "must be correct index.");
787 projs->catchall_catchproj = cpn;
788 }
789 }
790 }
791 break;
792 }
793 case TypeFunc::I_O:
794 if (pn->_is_io_use)
795 projs->catchall_ioproj = pn;
796 else
797 projs->fallthrough_ioproj = pn;
798 for (DUIterator j = pn->outs(); pn->has_out(j); j++) {
799 Node* e = pn->out(j);
800 if (e->Opcode() == Op_CreateEx && e->in(0)->is_CatchProj() && e->outcnt() > 0) {
801 assert(projs->exobj == NULL, "only one");
802 projs->exobj = e;
803 }
804 }
805 break;
806 case TypeFunc::Memory:
807 if (pn->_is_io_use)
808 projs->catchall_memproj = pn;
809 else
810 projs->fallthrough_memproj = pn;
811 break;
812 case TypeFunc::Parms:
813 projs->resproj = pn;
814 break;
815 default:
816 assert(false, "unexpected projection from allocation node.");
817 }
818 }
819
820 // The resproj may not exist because the result couuld be ignored
821 // and the exception object may not exist if an exception handler
822 // swallows the exception but all the other must exist and be found.
823 assert(projs->fallthrough_proj != NULL, "must be found");
824 assert(Compile::current()->inlining_incrementally() || projs->fallthrough_catchproj != NULL, "must be found");
825 assert(Compile::current()->inlining_incrementally() || projs->fallthrough_memproj != NULL, "must be found");
826 assert(Compile::current()->inlining_incrementally() || projs->fallthrough_ioproj != NULL, "must be found");
827 assert(Compile::current()->inlining_incrementally() || projs->catchall_catchproj != NULL, "must be found");
828 if (separate_io_proj) {
829 assert(Compile::current()->inlining_incrementally() || projs->catchall_memproj != NULL, "must be found");
830 assert(Compile::current()->inlining_incrementally() || projs->catchall_ioproj != NULL, "must be found");
831 }
832 }
833
834 Node *CallNode::Ideal(PhaseGVN *phase, bool can_reshape) {
835 CallGenerator* cg = generator();
836 if (can_reshape && cg != NULL && cg->is_mh_late_inline() && !cg->already_attempted()) {
837 // Check whether this MH handle call becomes a candidate for inlining
838 ciMethod* callee = cg->method();
839 vmIntrinsics::ID iid = callee->intrinsic_id();
840 if (iid == vmIntrinsics::_invokeBasic) {
841 if (in(TypeFunc::Parms)->Opcode() == Op_ConP) {
842 phase->C->prepend_late_inline(cg);
843 set_generator(NULL);
844 }
845 } else {
846 assert(callee->has_member_arg(), "wrong type of call?");
847 if (in(TypeFunc::Parms + callee->arg_size() - 1)->Opcode() == Op_ConP) {
848 phase->C->prepend_late_inline(cg);
849 set_generator(NULL);
850 }
851 }
852 }
853 return SafePointNode::Ideal(phase, can_reshape);
854 }
855
856
857 //=============================================================================
858 uint CallJavaNode::size_of() const { return sizeof(*this); }
859 uint CallJavaNode::cmp( const Node &n ) const {
860 CallJavaNode &call = (CallJavaNode&)n;
861 return CallNode::cmp(call) && _method == call._method;
862 }
863 #ifndef PRODUCT
864 void CallJavaNode::dump_spec(outputStream *st) const {
865 if( _method ) _method->print_short_name(st);
866 CallNode::dump_spec(st);
867 }
868 #endif
869
870 //=============================================================================
871 uint CallStaticJavaNode::size_of() const { return sizeof(*this); }
872 uint CallStaticJavaNode::cmp( const Node &n ) const {
873 CallStaticJavaNode &call = (CallStaticJavaNode&)n;
874 return CallJavaNode::cmp(call);
875 }
876
877 //----------------------------uncommon_trap_request----------------------------
878 // If this is an uncommon trap, return the request code, else zero.
879 int CallStaticJavaNode::uncommon_trap_request() const {
880 if (_name != NULL && !strcmp(_name, "uncommon_trap")) {
881 return extract_uncommon_trap_request(this);
882 }
883 return 0;
884 }
885 int CallStaticJavaNode::extract_uncommon_trap_request(const Node* call) {
886 #ifndef PRODUCT
887 if (!(call->req() > TypeFunc::Parms &&
888 call->in(TypeFunc::Parms) != NULL &&
889 call->in(TypeFunc::Parms)->is_Con())) {
890 assert(_in_dump_cnt != 0, "OK if dumping");
891 tty->print("[bad uncommon trap]");
892 return 0;
893 }
894 #endif
895 return call->in(TypeFunc::Parms)->bottom_type()->is_int()->get_con();
896 }
897
898 #ifndef PRODUCT
899 void CallStaticJavaNode::dump_spec(outputStream *st) const {
900 st->print("# Static ");
901 if (_name != NULL) {
902 st->print("%s", _name);
903 int trap_req = uncommon_trap_request();
904 if (trap_req != 0) {
905 char buf[100];
906 st->print("(%s)",
907 Deoptimization::format_trap_request(buf, sizeof(buf),
908 trap_req));
909 }
910 st->print(" ");
911 }
912 CallJavaNode::dump_spec(st);
913 }
914 #endif
915
916 //=============================================================================
917 uint CallDynamicJavaNode::size_of() const { return sizeof(*this); }
918 uint CallDynamicJavaNode::cmp( const Node &n ) const {
919 CallDynamicJavaNode &call = (CallDynamicJavaNode&)n;
920 return CallJavaNode::cmp(call);
921 }
922 #ifndef PRODUCT
923 void CallDynamicJavaNode::dump_spec(outputStream *st) const {
924 st->print("# Dynamic ");
925 CallJavaNode::dump_spec(st);
926 }
927 #endif
928
929 //=============================================================================
930 uint CallRuntimeNode::size_of() const { return sizeof(*this); }
931 uint CallRuntimeNode::cmp( const Node &n ) const {
932 CallRuntimeNode &call = (CallRuntimeNode&)n;
933 return CallNode::cmp(call) && !strcmp(_name,call._name);
934 }
935 #ifndef PRODUCT
936 void CallRuntimeNode::dump_spec(outputStream *st) const {
937 st->print("# ");
938 st->print(_name);
939 CallNode::dump_spec(st);
940 }
941 #endif
942
943 //------------------------------calling_convention-----------------------------
944 void CallRuntimeNode::calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const {
945 Matcher::c_calling_convention( sig_bt, parm_regs, argcnt );
946 }
947
948 //=============================================================================
949 //------------------------------calling_convention-----------------------------
950
951
952 //=============================================================================
953 #ifndef PRODUCT
954 void CallLeafNode::dump_spec(outputStream *st) const {
955 st->print("# ");
956 st->print(_name);
957 CallNode::dump_spec(st);
958 }
959 #endif
960
961 //=============================================================================
962
963 void SafePointNode::set_local(JVMState* jvms, uint idx, Node *c) {
964 assert(verify_jvms(jvms), "jvms must match");
965 int loc = jvms->locoff() + idx;
966 if (in(loc)->is_top() && idx > 0 && !c->is_top() ) {
967 // If current local idx is top then local idx - 1 could
968 // be a long/double that needs to be killed since top could
969 // represent the 2nd half ofthe long/double.
970 uint ideal = in(loc -1)->ideal_reg();
971 if (ideal == Op_RegD || ideal == Op_RegL) {
972 // set other (low index) half to top
973 set_req(loc - 1, in(loc));
974 }
975 }
976 set_req(loc, c);
977 }
978
979 uint SafePointNode::size_of() const { return sizeof(*this); }
980 uint SafePointNode::cmp( const Node &n ) const {
981 return (&n == this); // Always fail except on self
982 }
983
984 //-------------------------set_next_exception----------------------------------
985 void SafePointNode::set_next_exception(SafePointNode* n) {
986 assert(n == NULL || n->Opcode() == Op_SafePoint, "correct value for next_exception");
987 if (len() == req()) {
988 if (n != NULL) add_prec(n);
989 } else {
990 set_prec(req(), n);
991 }
992 }
993
994
995 //----------------------------next_exception-----------------------------------
996 SafePointNode* SafePointNode::next_exception() const {
997 if (len() == req()) {
998 return NULL;
999 } else {
1000 Node* n = in(req());
1001 assert(n == NULL || n->Opcode() == Op_SafePoint, "no other uses of prec edges");
1002 return (SafePointNode*) n;
1003 }
1004 }
1005
1006
1007 //------------------------------Ideal------------------------------------------
1008 // Skip over any collapsed Regions
1009 Node *SafePointNode::Ideal(PhaseGVN *phase, bool can_reshape) {
1010 return remove_dead_region(phase, can_reshape) ? this : NULL;
1011 }
1012
1013 //------------------------------Identity---------------------------------------
1014 // Remove obviously duplicate safepoints
1015 Node *SafePointNode::Identity( PhaseTransform *phase ) {
1016
1017 // If you have back to back safepoints, remove one
1018 if( in(TypeFunc::Control)->is_SafePoint() )
1019 return in(TypeFunc::Control);
1020
1021 if( in(0)->is_Proj() ) {
1022 Node *n0 = in(0)->in(0);
1023 // Check if he is a call projection (except Leaf Call)
1024 if( n0->is_Catch() ) {
1025 n0 = n0->in(0)->in(0);
1026 assert( n0->is_Call(), "expect a call here" );
1027 }
1028 if( n0->is_Call() && n0->as_Call()->guaranteed_safepoint() ) {
1029 // Useless Safepoint, so remove it
1030 return in(TypeFunc::Control);
1031 }
1032 }
1033
1034 return this;
1035 }
1036
1037 //------------------------------Value------------------------------------------
1038 const Type *SafePointNode::Value( PhaseTransform *phase ) const {
1039 if( phase->type(in(0)) == Type::TOP ) return Type::TOP;
1040 if( phase->eqv( in(0), this ) ) return Type::TOP; // Dead infinite loop
1041 return Type::CONTROL;
1042 }
1043
1044 #ifndef PRODUCT
1045 void SafePointNode::dump_spec(outputStream *st) const {
1046 st->print(" SafePoint ");
1047 }
1048 #endif
1049
1050 const RegMask &SafePointNode::in_RegMask(uint idx) const {
1051 if( idx < TypeFunc::Parms ) return RegMask::Empty;
1052 // Values outside the domain represent debug info
1053 return *(Compile::current()->matcher()->idealreg2debugmask[in(idx)->ideal_reg()]);
1054 }
1055 const RegMask &SafePointNode::out_RegMask() const {
1056 return RegMask::Empty;
1057 }
1058
1059
1060 void SafePointNode::grow_stack(JVMState* jvms, uint grow_by) {
1061 assert((int)grow_by > 0, "sanity");
1062 int monoff = jvms->monoff();
1063 int scloff = jvms->scloff();
1064 int endoff = jvms->endoff();
1065 assert(endoff == (int)req(), "no other states or debug info after me");
1066 assert(jvms->scl_size() == 0, "parsed code should not have scalar objects");
1067 Node* top = Compile::current()->top();
1068 for (uint i = 0; i < grow_by; i++) {
1069 ins_req(monoff, top);
1070 }
1071 jvms->set_monoff(monoff + grow_by);
1072 jvms->set_scloff(scloff + grow_by);
1073 jvms->set_endoff(endoff + grow_by);
1074 }
1075
1076 void SafePointNode::push_monitor(const FastLockNode *lock) {
1077 // Add a LockNode, which points to both the original BoxLockNode (the
1078 // stack space for the monitor) and the Object being locked.
1079 const int MonitorEdges = 2;
1080 assert(JVMState::logMonitorEdges == exact_log2(MonitorEdges), "correct MonitorEdges");
1081 assert(req() == jvms()->endoff(), "correct sizing");
1082 assert((jvms()->scl_size() == 0), "parsed code should not have scalar objects");
1083 int nextmon = jvms()->scloff();
1084 if (GenerateSynchronizationCode) {
1085 add_req(lock->box_node());
1086 add_req(lock->obj_node());
1087 } else {
1088 Node* top = Compile::current()->top();
1089 add_req(top);
1090 add_req(top);
1091 }
1092 jvms()->set_scloff(nextmon+MonitorEdges);
1093 jvms()->set_endoff(req());
1094 }
1095
1096 void SafePointNode::pop_monitor() {
1097 // Delete last monitor from debug info
1098 assert((jvms()->scl_size() == 0), "parsed code should not have scalar objects");
1099 debug_only(int num_before_pop = jvms()->nof_monitors());
1100 const int MonitorEdges = (1<<JVMState::logMonitorEdges);
1101 int scloff = jvms()->scloff();
1102 int endoff = jvms()->endoff();
1103 int new_scloff = scloff - MonitorEdges;
1104 int new_endoff = endoff - MonitorEdges;
1105 jvms()->set_scloff(new_scloff);
1106 jvms()->set_endoff(new_endoff);
1107 while (scloff > new_scloff) del_req(--scloff);
1108 assert(jvms()->nof_monitors() == num_before_pop-1, "");
1109 }
1110
1111 Node *SafePointNode::peek_monitor_box() const {
1112 int mon = jvms()->nof_monitors() - 1;
1113 assert(mon >= 0, "most have a monitor");
1114 return monitor_box(jvms(), mon);
1115 }
1116
1117 Node *SafePointNode::peek_monitor_obj() const {
1118 int mon = jvms()->nof_monitors() - 1;
1119 assert(mon >= 0, "most have a monitor");
1120 return monitor_obj(jvms(), mon);
1121 }
1122
1123 // Do we Match on this edge index or not? Match no edges
1124 uint SafePointNode::match_edge(uint idx) const {
1125 if( !needs_polling_address_input() )
1126 return 0;
1127
1128 return (TypeFunc::Parms == idx);
1129 }
1130
1131 //============== SafePointScalarObjectNode ==============
1132
1133 SafePointScalarObjectNode::SafePointScalarObjectNode(const TypeOopPtr* tp,
1134 #ifdef ASSERT
1135 AllocateNode* alloc,
1136 #endif
1137 uint first_index,
1138 uint n_fields) :
1139 TypeNode(tp, 1), // 1 control input -- seems required. Get from root.
1140 #ifdef ASSERT
1141 _alloc(alloc),
1142 #endif
1143 _first_index(first_index),
1144 _n_fields(n_fields)
1145 {
1146 init_class_id(Class_SafePointScalarObject);
1147 }
1148
1149 // Do not allow value-numbering for SafePointScalarObject node.
1150 uint SafePointScalarObjectNode::hash() const { return NO_HASH; }
1151 uint SafePointScalarObjectNode::cmp( const Node &n ) const {
1152 return (&n == this); // Always fail except on self
1153 }
1154
1155 uint SafePointScalarObjectNode::ideal_reg() const {
1156 return 0; // No matching to machine instruction
1157 }
1158
1159 const RegMask &SafePointScalarObjectNode::in_RegMask(uint idx) const {
1160 return *(Compile::current()->matcher()->idealreg2debugmask[in(idx)->ideal_reg()]);
1161 }
1162
1163 const RegMask &SafePointScalarObjectNode::out_RegMask() const {
1164 return RegMask::Empty;
1165 }
1166
1167 uint SafePointScalarObjectNode::match_edge(uint idx) const {
1168 return 0;
1169 }
1170
1171 SafePointScalarObjectNode*
1172 SafePointScalarObjectNode::clone(Dict* sosn_map) const {
1173 void* cached = (*sosn_map)[(void*)this];
1174 if (cached != NULL) {
1175 return (SafePointScalarObjectNode*)cached;
1176 }
1177 SafePointScalarObjectNode* res = (SafePointScalarObjectNode*)Node::clone();
1178 sosn_map->Insert((void*)this, (void*)res);
1179 return res;
1180 }
1181
1182
1183 #ifndef PRODUCT
1184 void SafePointScalarObjectNode::dump_spec(outputStream *st) const {
1185 st->print(" # fields@[%d..%d]", first_index(),
1186 first_index() + n_fields() - 1);
1187 }
1188
1189 #endif
1190
1191 //=============================================================================
1192 uint AllocateNode::size_of() const { return sizeof(*this); }
1193
1194 AllocateNode::AllocateNode(Compile* C, const TypeFunc *atype,
1195 Node *ctrl, Node *mem, Node *abio,
1196 Node *size, Node *klass_node, Node *initial_test)
1197 : CallNode(atype, NULL, TypeRawPtr::BOTTOM)
1198 {
1199 init_class_id(Class_Allocate);
1200 init_flags(Flag_is_macro);
1201 _is_scalar_replaceable = false;
1202 _is_non_escaping = false;
1203 Node *topnode = C->top();
1204
1205 init_req( TypeFunc::Control , ctrl );
1206 init_req( TypeFunc::I_O , abio );
1207 init_req( TypeFunc::Memory , mem );
1208 init_req( TypeFunc::ReturnAdr, topnode );
1209 init_req( TypeFunc::FramePtr , topnode );
1210 init_req( AllocSize , size);
1211 init_req( KlassNode , klass_node);
1212 init_req( InitialTest , initial_test);
1213 init_req( ALength , topnode);
1214 C->add_macro_node(this);
1215 }
1216
1217 //=============================================================================
1218 Node* AllocateArrayNode::Ideal(PhaseGVN *phase, bool can_reshape) {
1219 if (remove_dead_region(phase, can_reshape)) return this;
1220 // Don't bother trying to transform a dead node
1221 if (in(0) && in(0)->is_top()) return NULL;
1222
1223 const Type* type = phase->type(Ideal_length());
1224 if (type->isa_int() && type->is_int()->_hi < 0) {
1225 if (can_reshape) {
1226 PhaseIterGVN *igvn = phase->is_IterGVN();
1227 // Unreachable fall through path (negative array length),
1228 // the allocation can only throw so disconnect it.
1229 Node* proj = proj_out(TypeFunc::Control);
1230 Node* catchproj = NULL;
1231 if (proj != NULL) {
1232 for (DUIterator_Fast imax, i = proj->fast_outs(imax); i < imax; i++) {
1233 Node *cn = proj->fast_out(i);
1234 if (cn->is_Catch()) {
1235 catchproj = cn->as_Multi()->proj_out(CatchProjNode::fall_through_index);
1236 break;
1237 }
1238 }
1239 }
1240 if (catchproj != NULL && catchproj->outcnt() > 0 &&
1241 (catchproj->outcnt() > 1 ||
1242 catchproj->unique_out()->Opcode() != Op_Halt)) {
1243 assert(catchproj->is_CatchProj(), "must be a CatchProjNode");
1244 Node* nproj = catchproj->clone();
1245 igvn->register_new_node_with_optimizer(nproj);
1246
1247 Node *frame = new (phase->C) ParmNode( phase->C->start(), TypeFunc::FramePtr );
1248 frame = phase->transform(frame);
1249 // Halt & Catch Fire
1250 Node *halt = new (phase->C) HaltNode( nproj, frame );
1251 phase->C->root()->add_req(halt);
1252 phase->transform(halt);
1253
1254 igvn->replace_node(catchproj, phase->C->top());
1255 return this;
1256 }
1257 } else {
1258 // Can't correct it during regular GVN so register for IGVN
1259 phase->C->record_for_igvn(this);
1260 }
1261 }
1262 return NULL;
1263 }
1264
1265 // Retrieve the length from the AllocateArrayNode. Narrow the type with a
1266 // CastII, if appropriate. If we are not allowed to create new nodes, and
1267 // a CastII is appropriate, return NULL.
1268 Node *AllocateArrayNode::make_ideal_length(const TypeOopPtr* oop_type, PhaseTransform *phase, bool allow_new_nodes) {
1269 Node *length = in(AllocateNode::ALength);
1270 assert(length != NULL, "length is not null");
1271
1272 const TypeInt* length_type = phase->find_int_type(length);
1273 const TypeAryPtr* ary_type = oop_type->isa_aryptr();
1274
1275 if (ary_type != NULL && length_type != NULL) {
1276 const TypeInt* narrow_length_type = ary_type->narrow_size_type(length_type);
1277 if (narrow_length_type != length_type) {
1278 // Assert one of:
1279 // - the narrow_length is 0
1280 // - the narrow_length is not wider than length
1281 assert(narrow_length_type == TypeInt::ZERO ||
1282 length_type->is_con() && narrow_length_type->is_con() &&
1283 (narrow_length_type->_hi <= length_type->_lo) ||
1284 (narrow_length_type->_hi <= length_type->_hi &&
1285 narrow_length_type->_lo >= length_type->_lo),
1286 "narrow type must be narrower than length type");
1287
1288 // Return NULL if new nodes are not allowed
1289 if (!allow_new_nodes) return NULL;
1290 // Create a cast which is control dependent on the initialization to
1291 // propagate the fact that the array length must be positive.
1292 length = new (phase->C) CastIINode(length, narrow_length_type);
1293 length->set_req(0, initialization()->proj_out(0));
1294 }
1295 }
1296
1297 return length;
1298 }
1299
1300 //=============================================================================
1301 uint LockNode::size_of() const { return sizeof(*this); }
1302
1303 // Redundant lock elimination
1304 //
1305 // There are various patterns of locking where we release and
1306 // immediately reacquire a lock in a piece of code where no operations
1307 // occur in between that would be observable. In those cases we can
1308 // skip releasing and reacquiring the lock without violating any
1309 // fairness requirements. Doing this around a loop could cause a lock
1310 // to be held for a very long time so we concentrate on non-looping
1311 // control flow. We also require that the operations are fully
1312 // redundant meaning that we don't introduce new lock operations on
1313 // some paths so to be able to eliminate it on others ala PRE. This
1314 // would probably require some more extensive graph manipulation to
1315 // guarantee that the memory edges were all handled correctly.
1316 //
1317 // Assuming p is a simple predicate which can't trap in any way and s
1318 // is a synchronized method consider this code:
1319 //
1320 // s();
1321 // if (p)
1322 // s();
1323 // else
1324 // s();
1325 // s();
1326 //
1327 // 1. The unlocks of the first call to s can be eliminated if the
1328 // locks inside the then and else branches are eliminated.
1329 //
1330 // 2. The unlocks of the then and else branches can be eliminated if
1331 // the lock of the final call to s is eliminated.
1332 //
1333 // Either of these cases subsumes the simple case of sequential control flow
1334 //
1335 // Addtionally we can eliminate versions without the else case:
1336 //
1337 // s();
1338 // if (p)
1339 // s();
1340 // s();
1341 //
1342 // 3. In this case we eliminate the unlock of the first s, the lock
1343 // and unlock in the then case and the lock in the final s.
1344 //
1345 // Note also that in all these cases the then/else pieces don't have
1346 // to be trivial as long as they begin and end with synchronization
1347 // operations.
1348 //
1349 // s();
1350 // if (p)
1351 // s();
1352 // f();
1353 // s();
1354 // s();
1355 //
1356 // The code will work properly for this case, leaving in the unlock
1357 // before the call to f and the relock after it.
1358 //
1359 // A potentially interesting case which isn't handled here is when the
1360 // locking is partially redundant.
1361 //
1362 // s();
1363 // if (p)
1364 // s();
1365 //
1366 // This could be eliminated putting unlocking on the else case and
1367 // eliminating the first unlock and the lock in the then side.
1368 // Alternatively the unlock could be moved out of the then side so it
1369 // was after the merge and the first unlock and second lock
1370 // eliminated. This might require less manipulation of the memory
1371 // state to get correct.
1372 //
1373 // Additionally we might allow work between a unlock and lock before
1374 // giving up eliminating the locks. The current code disallows any
1375 // conditional control flow between these operations. A formulation
1376 // similar to partial redundancy elimination computing the
1377 // availability of unlocking and the anticipatability of locking at a
1378 // program point would allow detection of fully redundant locking with
1379 // some amount of work in between. I'm not sure how often I really
1380 // think that would occur though. Most of the cases I've seen
1381 // indicate it's likely non-trivial work would occur in between.
1382 // There may be other more complicated constructs where we could
1383 // eliminate locking but I haven't seen any others appear as hot or
1384 // interesting.
1385 //
1386 // Locking and unlocking have a canonical form in ideal that looks
1387 // roughly like this:
1388 //
1389 // <obj>
1390 // | \\------+
1391 // | \ \
1392 // | BoxLock \
1393 // | | | \
1394 // | | \ \
1395 // | | FastLock
1396 // | | /
1397 // | | /
1398 // | | |
1399 //
1400 // Lock
1401 // |
1402 // Proj #0
1403 // |
1404 // MembarAcquire
1405 // |
1406 // Proj #0
1407 //
1408 // MembarRelease
1409 // |
1410 // Proj #0
1411 // |
1412 // Unlock
1413 // |
1414 // Proj #0
1415 //
1416 //
1417 // This code proceeds by processing Lock nodes during PhaseIterGVN
1418 // and searching back through its control for the proper code
1419 // patterns. Once it finds a set of lock and unlock operations to
1420 // eliminate they are marked as eliminatable which causes the
1421 // expansion of the Lock and Unlock macro nodes to make the operation a NOP
1422 //
1423 //=============================================================================
1424
1425 //
1426 // Utility function to skip over uninteresting control nodes. Nodes skipped are:
1427 // - copy regions. (These may not have been optimized away yet.)
1428 // - eliminated locking nodes
1429 //
1430 static Node *next_control(Node *ctrl) {
1431 if (ctrl == NULL)
1432 return NULL;
1433 while (1) {
1434 if (ctrl->is_Region()) {
1435 RegionNode *r = ctrl->as_Region();
1436 Node *n = r->is_copy();
1437 if (n == NULL)
1438 break; // hit a region, return it
1439 else
1440 ctrl = n;
1441 } else if (ctrl->is_Proj()) {
1442 Node *in0 = ctrl->in(0);
1443 if (in0->is_AbstractLock() && in0->as_AbstractLock()->is_eliminated()) {
1444 ctrl = in0->in(0);
1445 } else {
1446 break;
1447 }
1448 } else {
1449 break; // found an interesting control
1450 }
1451 }
1452 return ctrl;
1453 }
1454 //
1455 // Given a control, see if it's the control projection of an Unlock which
1456 // operating on the same object as lock.
1457 //
1458 bool AbstractLockNode::find_matching_unlock(const Node* ctrl, LockNode* lock,
1459 GrowableArray<AbstractLockNode*> &lock_ops) {
1460 ProjNode *ctrl_proj = (ctrl->is_Proj()) ? ctrl->as_Proj() : NULL;
1461 if (ctrl_proj != NULL && ctrl_proj->_con == TypeFunc::Control) {
1462 Node *n = ctrl_proj->in(0);
1463 if (n != NULL && n->is_Unlock()) {
1464 UnlockNode *unlock = n->as_Unlock();
1465 if (lock->obj_node()->eqv_uncast(unlock->obj_node()) &&
1466 BoxLockNode::same_slot(lock->box_node(), unlock->box_node()) &&
1467 !unlock->is_eliminated()) {
1468 lock_ops.append(unlock);
1469 return true;
1470 }
1471 }
1472 }
1473 return false;
1474 }
1475
1476 //
1477 // Find the lock matching an unlock. Returns null if a safepoint
1478 // or complicated control is encountered first.
1479 LockNode *AbstractLockNode::find_matching_lock(UnlockNode* unlock) {
1480 LockNode *lock_result = NULL;
1481 // find the matching lock, or an intervening safepoint
1482 Node *ctrl = next_control(unlock->in(0));
1483 while (1) {
1484 assert(ctrl != NULL, "invalid control graph");
1485 assert(!ctrl->is_Start(), "missing lock for unlock");
1486 if (ctrl->is_top()) break; // dead control path
1487 if (ctrl->is_Proj()) ctrl = ctrl->in(0);
1488 if (ctrl->is_SafePoint()) {
1489 break; // found a safepoint (may be the lock we are searching for)
1490 } else if (ctrl->is_Region()) {
1491 // Check for a simple diamond pattern. Punt on anything more complicated
1492 if (ctrl->req() == 3 && ctrl->in(1) != NULL && ctrl->in(2) != NULL) {
1493 Node *in1 = next_control(ctrl->in(1));
1494 Node *in2 = next_control(ctrl->in(2));
1495 if (((in1->is_IfTrue() && in2->is_IfFalse()) ||
1496 (in2->is_IfTrue() && in1->is_IfFalse())) && (in1->in(0) == in2->in(0))) {
1497 ctrl = next_control(in1->in(0)->in(0));
1498 } else {
1499 break;
1500 }
1501 } else {
1502 break;
1503 }
1504 } else {
1505 ctrl = next_control(ctrl->in(0)); // keep searching
1506 }
1507 }
1508 if (ctrl->is_Lock()) {
1509 LockNode *lock = ctrl->as_Lock();
1510 if (lock->obj_node()->eqv_uncast(unlock->obj_node()) &&
1511 BoxLockNode::same_slot(lock->box_node(), unlock->box_node())) {
1512 lock_result = lock;
1513 }
1514 }
1515 return lock_result;
1516 }
1517
1518 // This code corresponds to case 3 above.
1519
1520 bool AbstractLockNode::find_lock_and_unlock_through_if(Node* node, LockNode* lock,
1521 GrowableArray<AbstractLockNode*> &lock_ops) {
1522 Node* if_node = node->in(0);
1523 bool if_true = node->is_IfTrue();
1524
1525 if (if_node->is_If() && if_node->outcnt() == 2 && (if_true || node->is_IfFalse())) {
1526 Node *lock_ctrl = next_control(if_node->in(0));
1527 if (find_matching_unlock(lock_ctrl, lock, lock_ops)) {
1528 Node* lock1_node = NULL;
1529 ProjNode* proj = if_node->as_If()->proj_out(!if_true);
1530 if (if_true) {
1531 if (proj->is_IfFalse() && proj->outcnt() == 1) {
1532 lock1_node = proj->unique_out();
1533 }
1534 } else {
1535 if (proj->is_IfTrue() && proj->outcnt() == 1) {
1536 lock1_node = proj->unique_out();
1537 }
1538 }
1539 if (lock1_node != NULL && lock1_node->is_Lock()) {
1540 LockNode *lock1 = lock1_node->as_Lock();
1541 if (lock->obj_node()->eqv_uncast(lock1->obj_node()) &&
1542 BoxLockNode::same_slot(lock->box_node(), lock1->box_node()) &&
1543 !lock1->is_eliminated()) {
1544 lock_ops.append(lock1);
1545 return true;
1546 }
1547 }
1548 }
1549 }
1550
1551 lock_ops.trunc_to(0);
1552 return false;
1553 }
1554
1555 bool AbstractLockNode::find_unlocks_for_region(const RegionNode* region, LockNode* lock,
1556 GrowableArray<AbstractLockNode*> &lock_ops) {
1557 // check each control merging at this point for a matching unlock.
1558 // in(0) should be self edge so skip it.
1559 for (int i = 1; i < (int)region->req(); i++) {
1560 Node *in_node = next_control(region->in(i));
1561 if (in_node != NULL) {
1562 if (find_matching_unlock(in_node, lock, lock_ops)) {
1563 // found a match so keep on checking.
1564 continue;
1565 } else if (find_lock_and_unlock_through_if(in_node, lock, lock_ops)) {
1566 continue;
1567 }
1568
1569 // If we fall through to here then it was some kind of node we
1570 // don't understand or there wasn't a matching unlock, so give
1571 // up trying to merge locks.
1572 lock_ops.trunc_to(0);
1573 return false;
1574 }
1575 }
1576 return true;
1577
1578 }
1579
1580 #ifndef PRODUCT
1581 //
1582 // Create a counter which counts the number of times this lock is acquired
1583 //
1584 void AbstractLockNode::create_lock_counter(JVMState* state) {
1585 _counter = OptoRuntime::new_named_counter(state, NamedCounter::LockCounter);
1586 }
1587
1588 void AbstractLockNode::set_eliminated_lock_counter() {
1589 if (_counter) {
1590 // Update the counter to indicate that this lock was eliminated.
1591 // The counter update code will stay around even though the
1592 // optimizer will eliminate the lock operation itself.
1593 _counter->set_tag(NamedCounter::EliminatedLockCounter);
1594 }
1595 }
1596 #endif
1597
1598 //=============================================================================
1599 Node *LockNode::Ideal(PhaseGVN *phase, bool can_reshape) {
1600
1601 // perform any generic optimizations first (returns 'this' or NULL)
1602 Node *result = SafePointNode::Ideal(phase, can_reshape);
1603 if (result != NULL) return result;
1604 // Don't bother trying to transform a dead node
1605 if (in(0) && in(0)->is_top()) return NULL;
1606
1607 // Now see if we can optimize away this lock. We don't actually
1608 // remove the locking here, we simply set the _eliminate flag which
1609 // prevents macro expansion from expanding the lock. Since we don't
1610 // modify the graph, the value returned from this function is the
1611 // one computed above.
1612 if (can_reshape && EliminateLocks && !is_non_esc_obj()) {
1613 //
1614 // If we are locking an unescaped object, the lock/unlock is unnecessary
1615 //
1616 ConnectionGraph *cgr = phase->C->congraph();
1617 if (cgr != NULL && cgr->not_global_escape(obj_node())) {
1618 assert(!is_eliminated() || is_coarsened(), "sanity");
1619 // The lock could be marked eliminated by lock coarsening
1620 // code during first IGVN before EA. Replace coarsened flag
1621 // to eliminate all associated locks/unlocks.
1622 this->set_non_esc_obj();
1623 return result;
1624 }
1625
1626 //
1627 // Try lock coarsening
1628 //
1629 PhaseIterGVN* iter = phase->is_IterGVN();
1630 if (iter != NULL && !is_eliminated()) {
1631
1632 GrowableArray<AbstractLockNode*> lock_ops;
1633
1634 Node *ctrl = next_control(in(0));
1635
1636 // now search back for a matching Unlock
1637 if (find_matching_unlock(ctrl, this, lock_ops)) {
1638 // found an unlock directly preceding this lock. This is the
1639 // case of single unlock directly control dependent on a
1640 // single lock which is the trivial version of case 1 or 2.
1641 } else if (ctrl->is_Region() ) {
1642 if (find_unlocks_for_region(ctrl->as_Region(), this, lock_ops)) {
1643 // found lock preceded by multiple unlocks along all paths
1644 // joining at this point which is case 3 in description above.
1645 }
1646 } else {
1647 // see if this lock comes from either half of an if and the
1648 // predecessors merges unlocks and the other half of the if
1649 // performs a lock.
1650 if (find_lock_and_unlock_through_if(ctrl, this, lock_ops)) {
1651 // found unlock splitting to an if with locks on both branches.
1652 }
1653 }
1654
1655 if (lock_ops.length() > 0) {
1656 // add ourselves to the list of locks to be eliminated.
1657 lock_ops.append(this);
1658
1659 #ifndef PRODUCT
1660 if (PrintEliminateLocks) {
1661 int locks = 0;
1662 int unlocks = 0;
1663 for (int i = 0; i < lock_ops.length(); i++) {
1664 AbstractLockNode* lock = lock_ops.at(i);
1665 if (lock->Opcode() == Op_Lock)
1666 locks++;
1667 else
1668 unlocks++;
1669 if (Verbose) {
1670 lock->dump(1);
1671 }
1672 }
1673 tty->print_cr("***Eliminated %d unlocks and %d locks", unlocks, locks);
1674 }
1675 #endif
1676
1677 // for each of the identified locks, mark them
1678 // as eliminatable
1679 for (int i = 0; i < lock_ops.length(); i++) {
1680 AbstractLockNode* lock = lock_ops.at(i);
1681
1682 // Mark it eliminated by coarsening and update any counters
1683 lock->set_coarsened();
1684 }
1685 } else if (ctrl->is_Region() &&
1686 iter->_worklist.member(ctrl)) {
1687 // We weren't able to find any opportunities but the region this
1688 // lock is control dependent on hasn't been processed yet so put
1689 // this lock back on the worklist so we can check again once any
1690 // region simplification has occurred.
1691 iter->_worklist.push(this);
1692 }
1693 }
1694 }
1695
1696 return result;
1697 }
1698
1699 //=============================================================================
1700 bool LockNode::is_nested_lock_region() {
1701 BoxLockNode* box = box_node()->as_BoxLock();
1702 int stk_slot = box->stack_slot();
1703 if (stk_slot <= 0)
1704 return false; // External lock or it is not Box (Phi node).
1705
1706 // Ignore complex cases: merged locks or multiple locks.
1707 Node* obj = obj_node();
1708 LockNode* unique_lock = NULL;
1709 if (!box->is_simple_lock_region(&unique_lock, obj) ||
1710 (unique_lock != this)) {
1711 return false;
1712 }
1713
1714 // Look for external lock for the same object.
1715 SafePointNode* sfn = this->as_SafePoint();
1716 JVMState* youngest_jvms = sfn->jvms();
1717 int max_depth = youngest_jvms->depth();
1718 for (int depth = 1; depth <= max_depth; depth++) {
1719 JVMState* jvms = youngest_jvms->of_depth(depth);
1720 int num_mon = jvms->nof_monitors();
1721 // Loop over monitors
1722 for (int idx = 0; idx < num_mon; idx++) {
1723 Node* obj_node = sfn->monitor_obj(jvms, idx);
1724 BoxLockNode* box_node = sfn->monitor_box(jvms, idx)->as_BoxLock();
1725 if ((box_node->stack_slot() < stk_slot) && obj_node->eqv_uncast(obj)) {
1726 return true;
1727 }
1728 }
1729 }
1730 return false;
1731 }
1732
1733 //=============================================================================
1734 uint UnlockNode::size_of() const { return sizeof(*this); }
1735
1736 //=============================================================================
1737 Node *UnlockNode::Ideal(PhaseGVN *phase, bool can_reshape) {
1738
1739 // perform any generic optimizations first (returns 'this' or NULL)
1740 Node *result = SafePointNode::Ideal(phase, can_reshape);
1741 if (result != NULL) return result;
1742 // Don't bother trying to transform a dead node
1743 if (in(0) && in(0)->is_top()) return NULL;
1744
1745 // Now see if we can optimize away this unlock. We don't actually
1746 // remove the unlocking here, we simply set the _eliminate flag which
1747 // prevents macro expansion from expanding the unlock. Since we don't
1748 // modify the graph, the value returned from this function is the
1749 // one computed above.
1750 // Escape state is defined after Parse phase.
1751 if (can_reshape && EliminateLocks && !is_non_esc_obj()) {
1752 //
1753 // If we are unlocking an unescaped object, the lock/unlock is unnecessary.
1754 //
1755 ConnectionGraph *cgr = phase->C->congraph();
1756 if (cgr != NULL && cgr->not_global_escape(obj_node())) {
1757 assert(!is_eliminated() || is_coarsened(), "sanity");
1758 // The lock could be marked eliminated by lock coarsening
1759 // code during first IGVN before EA. Replace coarsened flag
1760 // to eliminate all associated locks/unlocks.
1761 this->set_non_esc_obj();
1762 }
1763 }
1764 return result;
1765 }