Mercurial > hg > graal-compiler
comparison src/share/vm/opto/callnode.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | 76256d272075 |
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-1:000000000000 | 0:a61af66fc99e |
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1 /* | |
2 * Copyright 1997-2006 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 _endoff = _monoff; | |
234 _sp = 0; | |
235 } | |
236 JVMState::JVMState(int stack_size) { | |
237 _method = NULL; | |
238 _bci = InvocationEntryBci; | |
239 debug_only(_map = (SafePointNode*)-1); | |
240 _caller = NULL; | |
241 _depth = 1; | |
242 _locoff = TypeFunc::Parms; | |
243 _stkoff = _locoff; | |
244 _monoff = _stkoff + stack_size; | |
245 _endoff = _monoff; | |
246 _sp = 0; | |
247 } | |
248 | |
249 //--------------------------------of_depth------------------------------------- | |
250 JVMState* JVMState::of_depth(int d) const { | |
251 const JVMState* jvmp = this; | |
252 assert(0 < d && (uint)d <= depth(), "oob"); | |
253 for (int skip = depth() - d; skip > 0; skip--) { | |
254 jvmp = jvmp->caller(); | |
255 } | |
256 assert(jvmp->depth() == (uint)d, "found the right one"); | |
257 return (JVMState*)jvmp; | |
258 } | |
259 | |
260 //-----------------------------same_calls_as----------------------------------- | |
261 bool JVMState::same_calls_as(const JVMState* that) const { | |
262 if (this == that) return true; | |
263 if (this->depth() != that->depth()) return false; | |
264 const JVMState* p = this; | |
265 const JVMState* q = that; | |
266 for (;;) { | |
267 if (p->_method != q->_method) return false; | |
268 if (p->_method == NULL) return true; // bci is irrelevant | |
269 if (p->_bci != q->_bci) return false; | |
270 p = p->caller(); | |
271 q = q->caller(); | |
272 if (p == q) return true; | |
273 assert(p != NULL && q != NULL, "depth check ensures we don't run off end"); | |
274 } | |
275 } | |
276 | |
277 //------------------------------debug_start------------------------------------ | |
278 uint JVMState::debug_start() const { | |
279 debug_only(JVMState* jvmroot = of_depth(1)); | |
280 assert(jvmroot->locoff() <= this->locoff(), "youngest JVMState must be last"); | |
281 return of_depth(1)->locoff(); | |
282 } | |
283 | |
284 //-------------------------------debug_end------------------------------------- | |
285 uint JVMState::debug_end() const { | |
286 debug_only(JVMState* jvmroot = of_depth(1)); | |
287 assert(jvmroot->endoff() <= this->endoff(), "youngest JVMState must be last"); | |
288 return endoff(); | |
289 } | |
290 | |
291 //------------------------------debug_depth------------------------------------ | |
292 uint JVMState::debug_depth() const { | |
293 uint total = 0; | |
294 for (const JVMState* jvmp = this; jvmp != NULL; jvmp = jvmp->caller()) { | |
295 total += jvmp->debug_size(); | |
296 } | |
297 return total; | |
298 } | |
299 | |
300 //------------------------------format_helper---------------------------------- | |
301 // Given an allocation (a Chaitin object) and a Node decide if the Node carries | |
302 // any defined value or not. If it does, print out the register or constant. | |
303 #ifndef PRODUCT | |
304 static void format_helper( PhaseRegAlloc *regalloc, outputStream* st, Node *n, const char *msg, uint i ) { | |
305 if (n == NULL) { st->print(" NULL"); return; } | |
306 if( OptoReg::is_valid(regalloc->get_reg_first(n))) { // Check for undefined | |
307 char buf[50]; | |
308 regalloc->dump_register(n,buf); | |
309 st->print(" %s%d]=%s",msg,i,buf); | |
310 } else { // No register, but might be constant | |
311 const Type *t = n->bottom_type(); | |
312 switch (t->base()) { | |
313 case Type::Int: | |
314 st->print(" %s%d]=#"INT32_FORMAT,msg,i,t->is_int()->get_con()); | |
315 break; | |
316 case Type::AnyPtr: | |
317 assert( t == TypePtr::NULL_PTR, "" ); | |
318 st->print(" %s%d]=#NULL",msg,i); | |
319 break; | |
320 case Type::AryPtr: | |
321 case Type::KlassPtr: | |
322 case Type::InstPtr: | |
323 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,t->isa_oopptr()->const_oop()); | |
324 break; | |
325 case Type::RawPtr: | |
326 st->print(" %s%d]=#Raw" INTPTR_FORMAT,msg,i,t->is_rawptr()); | |
327 break; | |
328 case Type::DoubleCon: | |
329 st->print(" %s%d]=#%fD",msg,i,t->is_double_constant()->_d); | |
330 break; | |
331 case Type::FloatCon: | |
332 st->print(" %s%d]=#%fF",msg,i,t->is_float_constant()->_f); | |
333 break; | |
334 case Type::Long: | |
335 st->print(" %s%d]=#"INT64_FORMAT,msg,i,t->is_long()->get_con()); | |
336 break; | |
337 case Type::Half: | |
338 case Type::Top: | |
339 st->print(" %s%d]=_",msg,i); | |
340 break; | |
341 default: ShouldNotReachHere(); | |
342 } | |
343 } | |
344 } | |
345 #endif | |
346 | |
347 //------------------------------format----------------------------------------- | |
348 #ifndef PRODUCT | |
349 void JVMState::format(PhaseRegAlloc *regalloc, const Node *n, outputStream* st) const { | |
350 st->print(" #"); | |
351 if( _method ) { | |
352 _method->print_short_name(st); | |
353 st->print(" @ bci:%d ",_bci); | |
354 } else { | |
355 st->print_cr(" runtime stub "); | |
356 return; | |
357 } | |
358 if (n->is_MachSafePoint()) { | |
359 MachSafePointNode *mcall = n->as_MachSafePoint(); | |
360 uint i; | |
361 // Print locals | |
362 for( i = 0; i < (uint)loc_size(); i++ ) | |
363 format_helper( regalloc, st, mcall->local(this, i), "L[", i ); | |
364 // Print stack | |
365 for (i = 0; i < (uint)stk_size(); i++) { | |
366 if ((uint)(_stkoff + i) >= mcall->len()) | |
367 st->print(" oob "); | |
368 else | |
369 format_helper( regalloc, st, mcall->stack(this, i), "STK[", i ); | |
370 } | |
371 for (i = 0; (int)i < nof_monitors(); i++) { | |
372 Node *box = mcall->monitor_box(this, i); | |
373 Node *obj = mcall->monitor_obj(this, i); | |
374 if ( OptoReg::is_valid(regalloc->get_reg_first(box)) ) { | |
375 while( !box->is_BoxLock() ) box = box->in(1); | |
376 format_helper( regalloc, st, box, "MON-BOX[", i ); | |
377 } else { | |
378 OptoReg::Name box_reg = BoxLockNode::stack_slot(box); | |
379 st->print(" MON-BOX%d=%s+%d", | |
380 i, | |
381 OptoReg::regname(OptoReg::c_frame_pointer), | |
382 regalloc->reg2offset(box_reg)); | |
383 } | |
384 format_helper( regalloc, st, obj, "MON-OBJ[", i ); | |
385 } | |
386 } | |
387 st->print_cr(""); | |
388 if (caller() != NULL) caller()->format(regalloc, n, st); | |
389 } | |
390 #endif | |
391 | |
392 #ifndef PRODUCT | |
393 void JVMState::dump_spec(outputStream *st) const { | |
394 if (_method != NULL) { | |
395 bool printed = false; | |
396 if (!Verbose) { | |
397 // The JVMS dumps make really, really long lines. | |
398 // Take out the most boring parts, which are the package prefixes. | |
399 char buf[500]; | |
400 stringStream namest(buf, sizeof(buf)); | |
401 _method->print_short_name(&namest); | |
402 if (namest.count() < sizeof(buf)) { | |
403 const char* name = namest.base(); | |
404 if (name[0] == ' ') ++name; | |
405 const char* endcn = strchr(name, ':'); // end of class name | |
406 if (endcn == NULL) endcn = strchr(name, '('); | |
407 if (endcn == NULL) endcn = name + strlen(name); | |
408 while (endcn > name && endcn[-1] != '.' && endcn[-1] != '/') | |
409 --endcn; | |
410 st->print(" %s", endcn); | |
411 printed = true; | |
412 } | |
413 } | |
414 if (!printed) | |
415 _method->print_short_name(st); | |
416 st->print(" @ bci:%d",_bci); | |
417 } else { | |
418 st->print(" runtime stub"); | |
419 } | |
420 if (caller() != NULL) caller()->dump_spec(st); | |
421 } | |
422 #endif | |
423 | |
424 #ifndef PRODUCT | |
425 void JVMState::dump_on(outputStream* st) const { | |
426 if (_map && !((uintptr_t)_map & 1)) { | |
427 if (_map->len() > _map->req()) { // _map->has_exceptions() | |
428 Node* ex = _map->in(_map->req()); // _map->next_exception() | |
429 // skip the first one; it's already being printed | |
430 while (ex != NULL && ex->len() > ex->req()) { | |
431 ex = ex->in(ex->req()); // ex->next_exception() | |
432 ex->dump(1); | |
433 } | |
434 } | |
435 _map->dump(2); | |
436 } | |
437 st->print("JVMS depth=%d loc=%d stk=%d mon=%d end=%d mondepth=%d sp=%d bci=%d method=", | |
438 depth(), locoff(), stkoff(), monoff(), endoff(), monitor_depth(), sp(), bci()); | |
439 if (_method == NULL) { | |
440 st->print_cr("(none)"); | |
441 } else { | |
442 _method->print_name(st); | |
443 st->cr(); | |
444 if (bci() >= 0 && bci() < _method->code_size()) { | |
445 st->print(" bc: "); | |
446 _method->print_codes_on(bci(), bci()+1, st); | |
447 } | |
448 } | |
449 if (caller() != NULL) { | |
450 caller()->dump_on(st); | |
451 } | |
452 } | |
453 | |
454 // Extra way to dump a jvms from the debugger, | |
455 // to avoid a bug with C++ member function calls. | |
456 void dump_jvms(JVMState* jvms) { | |
457 jvms->dump(); | |
458 } | |
459 #endif | |
460 | |
461 //--------------------------clone_shallow-------------------------------------- | |
462 JVMState* JVMState::clone_shallow(Compile* C) const { | |
463 JVMState* n = has_method() ? new (C) JVMState(_method, _caller) : new (C) JVMState(0); | |
464 n->set_bci(_bci); | |
465 n->set_locoff(_locoff); | |
466 n->set_stkoff(_stkoff); | |
467 n->set_monoff(_monoff); | |
468 n->set_endoff(_endoff); | |
469 n->set_sp(_sp); | |
470 n->set_map(_map); | |
471 return n; | |
472 } | |
473 | |
474 //---------------------------clone_deep---------------------------------------- | |
475 JVMState* JVMState::clone_deep(Compile* C) const { | |
476 JVMState* n = clone_shallow(C); | |
477 for (JVMState* p = n; p->_caller != NULL; p = p->_caller) { | |
478 p->_caller = p->_caller->clone_shallow(C); | |
479 } | |
480 assert(n->depth() == depth(), "sanity"); | |
481 assert(n->debug_depth() == debug_depth(), "sanity"); | |
482 return n; | |
483 } | |
484 | |
485 //============================================================================= | |
486 uint CallNode::cmp( const Node &n ) const | |
487 { return _tf == ((CallNode&)n)._tf && _jvms == ((CallNode&)n)._jvms; } | |
488 #ifndef PRODUCT | |
489 void CallNode::dump_req() const { | |
490 // Dump the required inputs, enclosed in '(' and ')' | |
491 uint i; // Exit value of loop | |
492 for( i=0; i<req(); i++ ) { // For all required inputs | |
493 if( i == TypeFunc::Parms ) tty->print("("); | |
494 if( in(i) ) tty->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx); | |
495 else tty->print("_ "); | |
496 } | |
497 tty->print(")"); | |
498 } | |
499 | |
500 void CallNode::dump_spec(outputStream *st) const { | |
501 st->print(" "); | |
502 tf()->dump_on(st); | |
503 if (_cnt != COUNT_UNKNOWN) st->print(" C=%f",_cnt); | |
504 if (jvms() != NULL) jvms()->dump_spec(st); | |
505 } | |
506 #endif | |
507 | |
508 const Type *CallNode::bottom_type() const { return tf()->range(); } | |
509 const Type *CallNode::Value(PhaseTransform *phase) const { | |
510 if (phase->type(in(0)) == Type::TOP) return Type::TOP; | |
511 return tf()->range(); | |
512 } | |
513 | |
514 //------------------------------calling_convention----------------------------- | |
515 void CallNode::calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const { | |
516 // Use the standard compiler calling convention | |
517 Matcher::calling_convention( sig_bt, parm_regs, argcnt, true ); | |
518 } | |
519 | |
520 | |
521 //------------------------------match------------------------------------------ | |
522 // Construct projections for control, I/O, memory-fields, ..., and | |
523 // return result(s) along with their RegMask info | |
524 Node *CallNode::match( const ProjNode *proj, const Matcher *match ) { | |
525 switch (proj->_con) { | |
526 case TypeFunc::Control: | |
527 case TypeFunc::I_O: | |
528 case TypeFunc::Memory: | |
529 return new (match->C, 1) MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj); | |
530 | |
531 case TypeFunc::Parms+1: // For LONG & DOUBLE returns | |
532 assert(tf()->_range->field_at(TypeFunc::Parms+1) == Type::HALF, ""); | |
533 // 2nd half of doubles and longs | |
534 return new (match->C, 1) MachProjNode(this,proj->_con, RegMask::Empty, (uint)OptoReg::Bad); | |
535 | |
536 case TypeFunc::Parms: { // Normal returns | |
537 uint ideal_reg = Matcher::base2reg[tf()->range()->field_at(TypeFunc::Parms)->base()]; | |
538 OptoRegPair regs = is_CallRuntime() | |
539 ? match->c_return_value(ideal_reg,true) // Calls into C runtime | |
540 : match-> return_value(ideal_reg,true); // Calls into compiled Java code | |
541 RegMask rm = RegMask(regs.first()); | |
542 if( OptoReg::is_valid(regs.second()) ) | |
543 rm.Insert( regs.second() ); | |
544 return new (match->C, 1) MachProjNode(this,proj->_con,rm,ideal_reg); | |
545 } | |
546 | |
547 case TypeFunc::ReturnAdr: | |
548 case TypeFunc::FramePtr: | |
549 default: | |
550 ShouldNotReachHere(); | |
551 } | |
552 return NULL; | |
553 } | |
554 | |
555 // Do we Match on this edge index or not? Match no edges | |
556 uint CallNode::match_edge(uint idx) const { | |
557 return 0; | |
558 } | |
559 | |
560 //============================================================================= | |
561 uint CallJavaNode::size_of() const { return sizeof(*this); } | |
562 uint CallJavaNode::cmp( const Node &n ) const { | |
563 CallJavaNode &call = (CallJavaNode&)n; | |
564 return CallNode::cmp(call) && _method == call._method; | |
565 } | |
566 #ifndef PRODUCT | |
567 void CallJavaNode::dump_spec(outputStream *st) const { | |
568 if( _method ) _method->print_short_name(st); | |
569 CallNode::dump_spec(st); | |
570 } | |
571 #endif | |
572 | |
573 //============================================================================= | |
574 uint CallStaticJavaNode::size_of() const { return sizeof(*this); } | |
575 uint CallStaticJavaNode::cmp( const Node &n ) const { | |
576 CallStaticJavaNode &call = (CallStaticJavaNode&)n; | |
577 return CallJavaNode::cmp(call); | |
578 } | |
579 | |
580 //----------------------------uncommon_trap_request---------------------------- | |
581 // If this is an uncommon trap, return the request code, else zero. | |
582 int CallStaticJavaNode::uncommon_trap_request() const { | |
583 if (_name != NULL && !strcmp(_name, "uncommon_trap")) { | |
584 return extract_uncommon_trap_request(this); | |
585 } | |
586 return 0; | |
587 } | |
588 int CallStaticJavaNode::extract_uncommon_trap_request(const Node* call) { | |
589 #ifndef PRODUCT | |
590 if (!(call->req() > TypeFunc::Parms && | |
591 call->in(TypeFunc::Parms) != NULL && | |
592 call->in(TypeFunc::Parms)->is_Con())) { | |
593 assert(_in_dump_cnt != 0, "OK if dumping"); | |
594 tty->print("[bad uncommon trap]"); | |
595 return 0; | |
596 } | |
597 #endif | |
598 return call->in(TypeFunc::Parms)->bottom_type()->is_int()->get_con(); | |
599 } | |
600 | |
601 #ifndef PRODUCT | |
602 void CallStaticJavaNode::dump_spec(outputStream *st) const { | |
603 st->print("# Static "); | |
604 if (_name != NULL) { | |
605 st->print("%s", _name); | |
606 int trap_req = uncommon_trap_request(); | |
607 if (trap_req != 0) { | |
608 char buf[100]; | |
609 st->print("(%s)", | |
610 Deoptimization::format_trap_request(buf, sizeof(buf), | |
611 trap_req)); | |
612 } | |
613 st->print(" "); | |
614 } | |
615 CallJavaNode::dump_spec(st); | |
616 } | |
617 #endif | |
618 | |
619 //============================================================================= | |
620 uint CallDynamicJavaNode::size_of() const { return sizeof(*this); } | |
621 uint CallDynamicJavaNode::cmp( const Node &n ) const { | |
622 CallDynamicJavaNode &call = (CallDynamicJavaNode&)n; | |
623 return CallJavaNode::cmp(call); | |
624 } | |
625 #ifndef PRODUCT | |
626 void CallDynamicJavaNode::dump_spec(outputStream *st) const { | |
627 st->print("# Dynamic "); | |
628 CallJavaNode::dump_spec(st); | |
629 } | |
630 #endif | |
631 | |
632 //============================================================================= | |
633 uint CallRuntimeNode::size_of() const { return sizeof(*this); } | |
634 uint CallRuntimeNode::cmp( const Node &n ) const { | |
635 CallRuntimeNode &call = (CallRuntimeNode&)n; | |
636 return CallNode::cmp(call) && !strcmp(_name,call._name); | |
637 } | |
638 #ifndef PRODUCT | |
639 void CallRuntimeNode::dump_spec(outputStream *st) const { | |
640 st->print("# "); | |
641 st->print(_name); | |
642 CallNode::dump_spec(st); | |
643 } | |
644 #endif | |
645 | |
646 //------------------------------calling_convention----------------------------- | |
647 void CallRuntimeNode::calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const { | |
648 Matcher::c_calling_convention( sig_bt, parm_regs, argcnt ); | |
649 } | |
650 | |
651 //============================================================================= | |
652 //------------------------------calling_convention----------------------------- | |
653 | |
654 | |
655 //============================================================================= | |
656 #ifndef PRODUCT | |
657 void CallLeafNode::dump_spec(outputStream *st) const { | |
658 st->print("# "); | |
659 st->print(_name); | |
660 CallNode::dump_spec(st); | |
661 } | |
662 #endif | |
663 | |
664 //============================================================================= | |
665 | |
666 void SafePointNode::set_local(JVMState* jvms, uint idx, Node *c) { | |
667 assert(verify_jvms(jvms), "jvms must match"); | |
668 int loc = jvms->locoff() + idx; | |
669 if (in(loc)->is_top() && idx > 0 && !c->is_top() ) { | |
670 // If current local idx is top then local idx - 1 could | |
671 // be a long/double that needs to be killed since top could | |
672 // represent the 2nd half ofthe long/double. | |
673 uint ideal = in(loc -1)->ideal_reg(); | |
674 if (ideal == Op_RegD || ideal == Op_RegL) { | |
675 // set other (low index) half to top | |
676 set_req(loc - 1, in(loc)); | |
677 } | |
678 } | |
679 set_req(loc, c); | |
680 } | |
681 | |
682 uint SafePointNode::size_of() const { return sizeof(*this); } | |
683 uint SafePointNode::cmp( const Node &n ) const { | |
684 return (&n == this); // Always fail except on self | |
685 } | |
686 | |
687 //-------------------------set_next_exception---------------------------------- | |
688 void SafePointNode::set_next_exception(SafePointNode* n) { | |
689 assert(n == NULL || n->Opcode() == Op_SafePoint, "correct value for next_exception"); | |
690 if (len() == req()) { | |
691 if (n != NULL) add_prec(n); | |
692 } else { | |
693 set_prec(req(), n); | |
694 } | |
695 } | |
696 | |
697 | |
698 //----------------------------next_exception----------------------------------- | |
699 SafePointNode* SafePointNode::next_exception() const { | |
700 if (len() == req()) { | |
701 return NULL; | |
702 } else { | |
703 Node* n = in(req()); | |
704 assert(n == NULL || n->Opcode() == Op_SafePoint, "no other uses of prec edges"); | |
705 return (SafePointNode*) n; | |
706 } | |
707 } | |
708 | |
709 | |
710 //------------------------------Ideal------------------------------------------ | |
711 // Skip over any collapsed Regions | |
712 Node *SafePointNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
713 if (remove_dead_region(phase, can_reshape)) return this; | |
714 | |
715 return NULL; | |
716 } | |
717 | |
718 //------------------------------Identity--------------------------------------- | |
719 // Remove obviously duplicate safepoints | |
720 Node *SafePointNode::Identity( PhaseTransform *phase ) { | |
721 | |
722 // If you have back to back safepoints, remove one | |
723 if( in(TypeFunc::Control)->is_SafePoint() ) | |
724 return in(TypeFunc::Control); | |
725 | |
726 if( in(0)->is_Proj() ) { | |
727 Node *n0 = in(0)->in(0); | |
728 // Check if he is a call projection (except Leaf Call) | |
729 if( n0->is_Catch() ) { | |
730 n0 = n0->in(0)->in(0); | |
731 assert( n0->is_Call(), "expect a call here" ); | |
732 } | |
733 if( n0->is_Call() && n0->as_Call()->guaranteed_safepoint() ) { | |
734 // Useless Safepoint, so remove it | |
735 return in(TypeFunc::Control); | |
736 } | |
737 } | |
738 | |
739 return this; | |
740 } | |
741 | |
742 //------------------------------Value------------------------------------------ | |
743 const Type *SafePointNode::Value( PhaseTransform *phase ) const { | |
744 if( phase->type(in(0)) == Type::TOP ) return Type::TOP; | |
745 if( phase->eqv( in(0), this ) ) return Type::TOP; // Dead infinite loop | |
746 return Type::CONTROL; | |
747 } | |
748 | |
749 #ifndef PRODUCT | |
750 void SafePointNode::dump_spec(outputStream *st) const { | |
751 st->print(" SafePoint "); | |
752 } | |
753 #endif | |
754 | |
755 const RegMask &SafePointNode::in_RegMask(uint idx) const { | |
756 if( idx < TypeFunc::Parms ) return RegMask::Empty; | |
757 // Values outside the domain represent debug info | |
758 return *(Compile::current()->matcher()->idealreg2debugmask[in(idx)->ideal_reg()]); | |
759 } | |
760 const RegMask &SafePointNode::out_RegMask() const { | |
761 return RegMask::Empty; | |
762 } | |
763 | |
764 | |
765 void SafePointNode::grow_stack(JVMState* jvms, uint grow_by) { | |
766 assert((int)grow_by > 0, "sanity"); | |
767 int monoff = jvms->monoff(); | |
768 int endoff = jvms->endoff(); | |
769 assert(endoff == (int)req(), "no other states or debug info after me"); | |
770 Node* top = Compile::current()->top(); | |
771 for (uint i = 0; i < grow_by; i++) { | |
772 ins_req(monoff, top); | |
773 } | |
774 jvms->set_monoff(monoff + grow_by); | |
775 jvms->set_endoff(endoff + grow_by); | |
776 } | |
777 | |
778 void SafePointNode::push_monitor(const FastLockNode *lock) { | |
779 // Add a LockNode, which points to both the original BoxLockNode (the | |
780 // stack space for the monitor) and the Object being locked. | |
781 const int MonitorEdges = 2; | |
782 assert(JVMState::logMonitorEdges == exact_log2(MonitorEdges), "correct MonitorEdges"); | |
783 assert(req() == jvms()->endoff(), "correct sizing"); | |
784 if (GenerateSynchronizationCode) { | |
785 add_req(lock->box_node()); | |
786 add_req(lock->obj_node()); | |
787 } else { | |
788 add_req(NULL); | |
789 add_req(NULL); | |
790 } | |
791 jvms()->set_endoff(req()); | |
792 } | |
793 | |
794 void SafePointNode::pop_monitor() { | |
795 // Delete last monitor from debug info | |
796 debug_only(int num_before_pop = jvms()->nof_monitors()); | |
797 const int MonitorEdges = (1<<JVMState::logMonitorEdges); | |
798 int endoff = jvms()->endoff(); | |
799 int new_endoff = endoff - MonitorEdges; | |
800 jvms()->set_endoff(new_endoff); | |
801 while (endoff > new_endoff) del_req(--endoff); | |
802 assert(jvms()->nof_monitors() == num_before_pop-1, ""); | |
803 } | |
804 | |
805 Node *SafePointNode::peek_monitor_box() const { | |
806 int mon = jvms()->nof_monitors() - 1; | |
807 assert(mon >= 0, "most have a monitor"); | |
808 return monitor_box(jvms(), mon); | |
809 } | |
810 | |
811 Node *SafePointNode::peek_monitor_obj() const { | |
812 int mon = jvms()->nof_monitors() - 1; | |
813 assert(mon >= 0, "most have a monitor"); | |
814 return monitor_obj(jvms(), mon); | |
815 } | |
816 | |
817 // Do we Match on this edge index or not? Match no edges | |
818 uint SafePointNode::match_edge(uint idx) const { | |
819 if( !needs_polling_address_input() ) | |
820 return 0; | |
821 | |
822 return (TypeFunc::Parms == idx); | |
823 } | |
824 | |
825 //============================================================================= | |
826 uint AllocateNode::size_of() const { return sizeof(*this); } | |
827 | |
828 AllocateNode::AllocateNode(Compile* C, const TypeFunc *atype, | |
829 Node *ctrl, Node *mem, Node *abio, | |
830 Node *size, Node *klass_node, Node *initial_test) | |
831 : CallNode(atype, NULL, TypeRawPtr::BOTTOM) | |
832 { | |
833 init_class_id(Class_Allocate); | |
834 init_flags(Flag_is_macro); | |
835 Node *topnode = C->top(); | |
836 | |
837 init_req( TypeFunc::Control , ctrl ); | |
838 init_req( TypeFunc::I_O , abio ); | |
839 init_req( TypeFunc::Memory , mem ); | |
840 init_req( TypeFunc::ReturnAdr, topnode ); | |
841 init_req( TypeFunc::FramePtr , topnode ); | |
842 init_req( AllocSize , size); | |
843 init_req( KlassNode , klass_node); | |
844 init_req( InitialTest , initial_test); | |
845 init_req( ALength , topnode); | |
846 C->add_macro_node(this); | |
847 } | |
848 | |
849 //============================================================================= | |
850 uint AllocateArrayNode::size_of() const { return sizeof(*this); } | |
851 | |
852 //============================================================================= | |
853 uint LockNode::size_of() const { return sizeof(*this); } | |
854 | |
855 // Redundant lock elimination | |
856 // | |
857 // There are various patterns of locking where we release and | |
858 // immediately reacquire a lock in a piece of code where no operations | |
859 // occur in between that would be observable. In those cases we can | |
860 // skip releasing and reacquiring the lock without violating any | |
861 // fairness requirements. Doing this around a loop could cause a lock | |
862 // to be held for a very long time so we concentrate on non-looping | |
863 // control flow. We also require that the operations are fully | |
864 // redundant meaning that we don't introduce new lock operations on | |
865 // some paths so to be able to eliminate it on others ala PRE. This | |
866 // would probably require some more extensive graph manipulation to | |
867 // guarantee that the memory edges were all handled correctly. | |
868 // | |
869 // Assuming p is a simple predicate which can't trap in any way and s | |
870 // is a synchronized method consider this code: | |
871 // | |
872 // s(); | |
873 // if (p) | |
874 // s(); | |
875 // else | |
876 // s(); | |
877 // s(); | |
878 // | |
879 // 1. The unlocks of the first call to s can be eliminated if the | |
880 // locks inside the then and else branches are eliminated. | |
881 // | |
882 // 2. The unlocks of the then and else branches can be eliminated if | |
883 // the lock of the final call to s is eliminated. | |
884 // | |
885 // Either of these cases subsumes the simple case of sequential control flow | |
886 // | |
887 // Addtionally we can eliminate versions without the else case: | |
888 // | |
889 // s(); | |
890 // if (p) | |
891 // s(); | |
892 // s(); | |
893 // | |
894 // 3. In this case we eliminate the unlock of the first s, the lock | |
895 // and unlock in the then case and the lock in the final s. | |
896 // | |
897 // Note also that in all these cases the then/else pieces don't have | |
898 // to be trivial as long as they begin and end with synchronization | |
899 // operations. | |
900 // | |
901 // s(); | |
902 // if (p) | |
903 // s(); | |
904 // f(); | |
905 // s(); | |
906 // s(); | |
907 // | |
908 // The code will work properly for this case, leaving in the unlock | |
909 // before the call to f and the relock after it. | |
910 // | |
911 // A potentially interesting case which isn't handled here is when the | |
912 // locking is partially redundant. | |
913 // | |
914 // s(); | |
915 // if (p) | |
916 // s(); | |
917 // | |
918 // This could be eliminated putting unlocking on the else case and | |
919 // eliminating the first unlock and the lock in the then side. | |
920 // Alternatively the unlock could be moved out of the then side so it | |
921 // was after the merge and the first unlock and second lock | |
922 // eliminated. This might require less manipulation of the memory | |
923 // state to get correct. | |
924 // | |
925 // Additionally we might allow work between a unlock and lock before | |
926 // giving up eliminating the locks. The current code disallows any | |
927 // conditional control flow between these operations. A formulation | |
928 // similar to partial redundancy elimination computing the | |
929 // availability of unlocking and the anticipatability of locking at a | |
930 // program point would allow detection of fully redundant locking with | |
931 // some amount of work in between. I'm not sure how often I really | |
932 // think that would occur though. Most of the cases I've seen | |
933 // indicate it's likely non-trivial work would occur in between. | |
934 // There may be other more complicated constructs where we could | |
935 // eliminate locking but I haven't seen any others appear as hot or | |
936 // interesting. | |
937 // | |
938 // Locking and unlocking have a canonical form in ideal that looks | |
939 // roughly like this: | |
940 // | |
941 // <obj> | |
942 // | \\------+ | |
943 // | \ \ | |
944 // | BoxLock \ | |
945 // | | | \ | |
946 // | | \ \ | |
947 // | | FastLock | |
948 // | | / | |
949 // | | / | |
950 // | | | | |
951 // | |
952 // Lock | |
953 // | | |
954 // Proj #0 | |
955 // | | |
956 // MembarAcquire | |
957 // | | |
958 // Proj #0 | |
959 // | |
960 // MembarRelease | |
961 // | | |
962 // Proj #0 | |
963 // | | |
964 // Unlock | |
965 // | | |
966 // Proj #0 | |
967 // | |
968 // | |
969 // This code proceeds by processing Lock nodes during PhaseIterGVN | |
970 // and searching back through its control for the proper code | |
971 // patterns. Once it finds a set of lock and unlock operations to | |
972 // eliminate they are marked as eliminatable which causes the | |
973 // expansion of the Lock and Unlock macro nodes to make the operation a NOP | |
974 // | |
975 //============================================================================= | |
976 | |
977 // | |
978 // Utility function to skip over uninteresting control nodes. Nodes skipped are: | |
979 // - copy regions. (These may not have been optimized away yet.) | |
980 // - eliminated locking nodes | |
981 // | |
982 static Node *next_control(Node *ctrl) { | |
983 if (ctrl == NULL) | |
984 return NULL; | |
985 while (1) { | |
986 if (ctrl->is_Region()) { | |
987 RegionNode *r = ctrl->as_Region(); | |
988 Node *n = r->is_copy(); | |
989 if (n == NULL) | |
990 break; // hit a region, return it | |
991 else | |
992 ctrl = n; | |
993 } else if (ctrl->is_Proj()) { | |
994 Node *in0 = ctrl->in(0); | |
995 if (in0->is_AbstractLock() && in0->as_AbstractLock()->is_eliminated()) { | |
996 ctrl = in0->in(0); | |
997 } else { | |
998 break; | |
999 } | |
1000 } else { | |
1001 break; // found an interesting control | |
1002 } | |
1003 } | |
1004 return ctrl; | |
1005 } | |
1006 // | |
1007 // Given a control, see if it's the control projection of an Unlock which | |
1008 // operating on the same object as lock. | |
1009 // | |
1010 bool AbstractLockNode::find_matching_unlock(const Node* ctrl, LockNode* lock, | |
1011 GrowableArray<AbstractLockNode*> &lock_ops) { | |
1012 ProjNode *ctrl_proj = (ctrl->is_Proj()) ? ctrl->as_Proj() : NULL; | |
1013 if (ctrl_proj != NULL && ctrl_proj->_con == TypeFunc::Control) { | |
1014 Node *n = ctrl_proj->in(0); | |
1015 if (n != NULL && n->is_Unlock()) { | |
1016 UnlockNode *unlock = n->as_Unlock(); | |
1017 if ((lock->obj_node() == unlock->obj_node()) && | |
1018 (lock->box_node() == unlock->box_node()) && !unlock->is_eliminated()) { | |
1019 lock_ops.append(unlock); | |
1020 return true; | |
1021 } | |
1022 } | |
1023 } | |
1024 return false; | |
1025 } | |
1026 | |
1027 // | |
1028 // Find the lock matching an unlock. Returns null if a safepoint | |
1029 // or complicated control is encountered first. | |
1030 LockNode *AbstractLockNode::find_matching_lock(UnlockNode* unlock) { | |
1031 LockNode *lock_result = NULL; | |
1032 // find the matching lock, or an intervening safepoint | |
1033 Node *ctrl = next_control(unlock->in(0)); | |
1034 while (1) { | |
1035 assert(ctrl != NULL, "invalid control graph"); | |
1036 assert(!ctrl->is_Start(), "missing lock for unlock"); | |
1037 if (ctrl->is_top()) break; // dead control path | |
1038 if (ctrl->is_Proj()) ctrl = ctrl->in(0); | |
1039 if (ctrl->is_SafePoint()) { | |
1040 break; // found a safepoint (may be the lock we are searching for) | |
1041 } else if (ctrl->is_Region()) { | |
1042 // Check for a simple diamond pattern. Punt on anything more complicated | |
1043 if (ctrl->req() == 3 && ctrl->in(1) != NULL && ctrl->in(2) != NULL) { | |
1044 Node *in1 = next_control(ctrl->in(1)); | |
1045 Node *in2 = next_control(ctrl->in(2)); | |
1046 if (((in1->is_IfTrue() && in2->is_IfFalse()) || | |
1047 (in2->is_IfTrue() && in1->is_IfFalse())) && (in1->in(0) == in2->in(0))) { | |
1048 ctrl = next_control(in1->in(0)->in(0)); | |
1049 } else { | |
1050 break; | |
1051 } | |
1052 } else { | |
1053 break; | |
1054 } | |
1055 } else { | |
1056 ctrl = next_control(ctrl->in(0)); // keep searching | |
1057 } | |
1058 } | |
1059 if (ctrl->is_Lock()) { | |
1060 LockNode *lock = ctrl->as_Lock(); | |
1061 if ((lock->obj_node() == unlock->obj_node()) && | |
1062 (lock->box_node() == unlock->box_node())) { | |
1063 lock_result = lock; | |
1064 } | |
1065 } | |
1066 return lock_result; | |
1067 } | |
1068 | |
1069 // This code corresponds to case 3 above. | |
1070 | |
1071 bool AbstractLockNode::find_lock_and_unlock_through_if(Node* node, LockNode* lock, | |
1072 GrowableArray<AbstractLockNode*> &lock_ops) { | |
1073 Node* if_node = node->in(0); | |
1074 bool if_true = node->is_IfTrue(); | |
1075 | |
1076 if (if_node->is_If() && if_node->outcnt() == 2 && (if_true || node->is_IfFalse())) { | |
1077 Node *lock_ctrl = next_control(if_node->in(0)); | |
1078 if (find_matching_unlock(lock_ctrl, lock, lock_ops)) { | |
1079 Node* lock1_node = NULL; | |
1080 ProjNode* proj = if_node->as_If()->proj_out(!if_true); | |
1081 if (if_true) { | |
1082 if (proj->is_IfFalse() && proj->outcnt() == 1) { | |
1083 lock1_node = proj->unique_out(); | |
1084 } | |
1085 } else { | |
1086 if (proj->is_IfTrue() && proj->outcnt() == 1) { | |
1087 lock1_node = proj->unique_out(); | |
1088 } | |
1089 } | |
1090 if (lock1_node != NULL && lock1_node->is_Lock()) { | |
1091 LockNode *lock1 = lock1_node->as_Lock(); | |
1092 if ((lock->obj_node() == lock1->obj_node()) && | |
1093 (lock->box_node() == lock1->box_node()) && !lock1->is_eliminated()) { | |
1094 lock_ops.append(lock1); | |
1095 return true; | |
1096 } | |
1097 } | |
1098 } | |
1099 } | |
1100 | |
1101 lock_ops.trunc_to(0); | |
1102 return false; | |
1103 } | |
1104 | |
1105 bool AbstractLockNode::find_unlocks_for_region(const RegionNode* region, LockNode* lock, | |
1106 GrowableArray<AbstractLockNode*> &lock_ops) { | |
1107 // check each control merging at this point for a matching unlock. | |
1108 // in(0) should be self edge so skip it. | |
1109 for (int i = 1; i < (int)region->req(); i++) { | |
1110 Node *in_node = next_control(region->in(i)); | |
1111 if (in_node != NULL) { | |
1112 if (find_matching_unlock(in_node, lock, lock_ops)) { | |
1113 // found a match so keep on checking. | |
1114 continue; | |
1115 } else if (find_lock_and_unlock_through_if(in_node, lock, lock_ops)) { | |
1116 continue; | |
1117 } | |
1118 | |
1119 // If we fall through to here then it was some kind of node we | |
1120 // don't understand or there wasn't a matching unlock, so give | |
1121 // up trying to merge locks. | |
1122 lock_ops.trunc_to(0); | |
1123 return false; | |
1124 } | |
1125 } | |
1126 return true; | |
1127 | |
1128 } | |
1129 | |
1130 #ifndef PRODUCT | |
1131 // | |
1132 // Create a counter which counts the number of times this lock is acquired | |
1133 // | |
1134 void AbstractLockNode::create_lock_counter(JVMState* state) { | |
1135 _counter = OptoRuntime::new_named_counter(state, NamedCounter::LockCounter); | |
1136 } | |
1137 #endif | |
1138 | |
1139 void AbstractLockNode::set_eliminated() { | |
1140 _eliminate = true; | |
1141 #ifndef PRODUCT | |
1142 if (_counter) { | |
1143 // Update the counter to indicate that this lock was eliminated. | |
1144 // The counter update code will stay around even though the | |
1145 // optimizer will eliminate the lock operation itself. | |
1146 _counter->set_tag(NamedCounter::EliminatedLockCounter); | |
1147 } | |
1148 #endif | |
1149 } | |
1150 | |
1151 //============================================================================= | |
1152 Node *LockNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1153 | |
1154 // perform any generic optimizations first | |
1155 Node *result = SafePointNode::Ideal(phase, can_reshape); | |
1156 | |
1157 // Now see if we can optimize away this lock. We don't actually | |
1158 // remove the locking here, we simply set the _eliminate flag which | |
1159 // prevents macro expansion from expanding the lock. Since we don't | |
1160 // modify the graph, the value returned from this function is the | |
1161 // one computed above. | |
1162 if (EliminateLocks && !is_eliminated()) { | |
1163 // | |
1164 // Try lock coarsening | |
1165 // | |
1166 PhaseIterGVN* iter = phase->is_IterGVN(); | |
1167 if (iter != NULL) { | |
1168 | |
1169 GrowableArray<AbstractLockNode*> lock_ops; | |
1170 | |
1171 Node *ctrl = next_control(in(0)); | |
1172 | |
1173 // now search back for a matching Unlock | |
1174 if (find_matching_unlock(ctrl, this, lock_ops)) { | |
1175 // found an unlock directly preceding this lock. This is the | |
1176 // case of single unlock directly control dependent on a | |
1177 // single lock which is the trivial version of case 1 or 2. | |
1178 } else if (ctrl->is_Region() ) { | |
1179 if (find_unlocks_for_region(ctrl->as_Region(), this, lock_ops)) { | |
1180 // found lock preceded by multiple unlocks along all paths | |
1181 // joining at this point which is case 3 in description above. | |
1182 } | |
1183 } else { | |
1184 // see if this lock comes from either half of an if and the | |
1185 // predecessors merges unlocks and the other half of the if | |
1186 // performs a lock. | |
1187 if (find_lock_and_unlock_through_if(ctrl, this, lock_ops)) { | |
1188 // found unlock splitting to an if with locks on both branches. | |
1189 } | |
1190 } | |
1191 | |
1192 if (lock_ops.length() > 0) { | |
1193 // add ourselves to the list of locks to be eliminated. | |
1194 lock_ops.append(this); | |
1195 | |
1196 #ifndef PRODUCT | |
1197 if (PrintEliminateLocks) { | |
1198 int locks = 0; | |
1199 int unlocks = 0; | |
1200 for (int i = 0; i < lock_ops.length(); i++) { | |
1201 AbstractLockNode* lock = lock_ops.at(i); | |
1202 if (lock->Opcode() == Op_Lock) locks++; | |
1203 else unlocks++; | |
1204 if (Verbose) { | |
1205 lock->dump(1); | |
1206 } | |
1207 } | |
1208 tty->print_cr("***Eliminated %d unlocks and %d locks", unlocks, locks); | |
1209 } | |
1210 #endif | |
1211 | |
1212 // for each of the identified locks, mark them | |
1213 // as eliminatable | |
1214 for (int i = 0; i < lock_ops.length(); i++) { | |
1215 AbstractLockNode* lock = lock_ops.at(i); | |
1216 | |
1217 // Mark it eliminated to update any counters | |
1218 lock->set_eliminated(); | |
1219 } | |
1220 } else if (result != NULL && ctrl->is_Region() && | |
1221 iter->_worklist.member(ctrl)) { | |
1222 // We weren't able to find any opportunities but the region this | |
1223 // lock is control dependent on hasn't been processed yet so put | |
1224 // this lock back on the worklist so we can check again once any | |
1225 // region simplification has occurred. | |
1226 iter->_worklist.push(this); | |
1227 } | |
1228 } | |
1229 } | |
1230 | |
1231 return result; | |
1232 } | |
1233 | |
1234 //============================================================================= | |
1235 uint UnlockNode::size_of() const { return sizeof(*this); } | |
1236 | |
1237 //============================================================================= | |
1238 Node *UnlockNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1239 | |
1240 // perform any generic optimizations first | |
1241 Node * result = SafePointNode::Ideal(phase, can_reshape); | |
1242 | |
1243 // Now see if we can optimize away this unlock. We don't actually | |
1244 // remove the unlocking here, we simply set the _eliminate flag which | |
1245 // prevents macro expansion from expanding the unlock. Since we don't | |
1246 // modify the graph, the value returned from this function is the | |
1247 // one computed above. | |
1248 if (EliminateLocks && !is_eliminated()) { | |
1249 // | |
1250 // If we are unlocking an unescaped object, the lock/unlock is unnecessary | |
1251 // We can eliminate them if there are no safepoints in the locked region. | |
1252 // | |
1253 ConnectionGraph *cgr = Compile::current()->congraph(); | |
1254 if (cgr != NULL && cgr->escape_state(obj_node(), phase) == PointsToNode::NoEscape) { | |
1255 GrowableArray<AbstractLockNode*> lock_ops; | |
1256 LockNode *lock = find_matching_lock(this); | |
1257 if (lock != NULL) { | |
1258 lock_ops.append(this); | |
1259 lock_ops.append(lock); | |
1260 // find other unlocks which pair with the lock we found and add them | |
1261 // to the list | |
1262 Node * box = box_node(); | |
1263 | |
1264 for (DUIterator_Fast imax, i = box->fast_outs(imax); i < imax; i++) { | |
1265 Node *use = box->fast_out(i); | |
1266 if (use->is_Unlock() && use != this) { | |
1267 UnlockNode *unlock1 = use->as_Unlock(); | |
1268 if (!unlock1->is_eliminated()) { | |
1269 LockNode *lock1 = find_matching_lock(unlock1); | |
1270 if (lock == lock1) | |
1271 lock_ops.append(unlock1); | |
1272 else if (lock1 == NULL) { | |
1273 // we can't find a matching lock, we must assume the worst | |
1274 lock_ops.trunc_to(0); | |
1275 break; | |
1276 } | |
1277 } | |
1278 } | |
1279 } | |
1280 if (lock_ops.length() > 0) { | |
1281 | |
1282 #ifndef PRODUCT | |
1283 if (PrintEliminateLocks) { | |
1284 int locks = 0; | |
1285 int unlocks = 0; | |
1286 for (int i = 0; i < lock_ops.length(); i++) { | |
1287 AbstractLockNode* lock = lock_ops.at(i); | |
1288 if (lock->Opcode() == Op_Lock) locks++; | |
1289 else unlocks++; | |
1290 if (Verbose) { | |
1291 lock->dump(1); | |
1292 } | |
1293 } | |
1294 tty->print_cr("***Eliminated %d unescaped unlocks and %d unescaped locks", unlocks, locks); | |
1295 } | |
1296 #endif | |
1297 | |
1298 // for each of the identified locks, mark them | |
1299 // as eliminatable | |
1300 for (int i = 0; i < lock_ops.length(); i++) { | |
1301 AbstractLockNode* lock = lock_ops.at(i); | |
1302 | |
1303 // Mark it eliminated to update any counters | |
1304 lock->set_eliminated(); | |
1305 } | |
1306 } | |
1307 } | |
1308 } | |
1309 } | |
1310 return result; | |
1311 } |