Mercurial > hg > graal-compiler
annotate src/share/vm/opto/callnode.cpp @ 11825:463f51256c86
AMD64HotSpot: emit jump to IC miss handler directly instead of emitting it inside verfied_entry
for empty methods we emitted something like this if a inline cache is needed:
prefix:
00: < IC check >
...
0b: jne <ic_miss_call>
11: nop
...
verified_entry:
20: ret
ic_miss_call:
21: jmp <entry of runtime function>
when a method is deoptimized, HotSpot patches the verified_entry (0x20) with a
jump to a stub that handles call-sites that has been made non-entrant. since this jump
is 5 bytes long, it will overwrite ic_miss_call and blow up every caller that
calls this method via the unverified entry (prefix).
the fix is to emit the jump to the runtime function inside the unverfied entry:
prefix:
00: < IC check >
...
0b: je <verified_entry>
11: jeq <entry of runtime function>
16: nop
...
verified_entry:
20: ret
author | Bernhard Urban <bernhard.urban@jku.at> |
---|---|
date | Mon, 30 Sep 2013 09:32:18 +0200 |
parents | 6f3fd5150b67 |
children | 766fac3395d6 |
rev | line source |
---|---|
0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "ci/bcEscapeAnalyzer.hpp" | |
27 #include "compiler/oopMap.hpp" | |
7473 | 28 #include "opto/callGenerator.hpp" |
1972 | 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 | |
0 | 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: | |
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76 return new (match->C) MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj); |
0 | 77 case TypeFunc::FramePtr: |
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78 return new (match->C) MachProjNode(this,proj->_con,Matcher::c_frame_ptr_mask, Op_RegP); |
0 | 79 case TypeFunc::ReturnAdr: |
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80 return new (match->C) MachProjNode(this,proj->_con,match->_return_addr_mask,Op_RegP); |
0 | 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 | |
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86 return new (match->C) ConNode(Type::TOP); |
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87 uint ideal_reg = t->ideal_reg(); |
0 | 88 RegMask &rm = match->_calling_convention_mask[parm_num]; |
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89 return new (match->C) MachProjNode(this,proj->_con,rm,ideal_reg); |
0 | 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); | |
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135 return t->ideal_reg(); |
0 | 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 | |
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168 void ReturnNode::dump_req(outputStream *st) const { |
0 | 169 // Dump the required inputs, enclosed in '(' and ')' |
170 uint i; // Exit value of loop | |
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171 for (i = 0; i < req(); i++) { // For all required inputs |
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172 if (i == TypeFunc::Parms) st->print("returns"); |
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173 if (in(i)) st->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx); |
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174 else st->print("_ "); |
0 | 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 | |
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211 void RethrowNode::dump_req(outputStream *st) const { |
0 | 212 // Dump the required inputs, enclosed in '(' and ')' |
213 uint i; // Exit value of loop | |
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214 for (i = 0; i < req(); i++) { // For all required inputs |
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215 if (i == TypeFunc::Parms) st->print("exception"); |
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216 if (in(i)) st->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx); |
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217 else st->print("_ "); |
0 | 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 //============================================================================= | |
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235 JVMState::JVMState(ciMethod* method, JVMState* caller) : |
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236 _method(method) { |
0 | 237 assert(method != NULL, "must be valid call site"); |
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238 _reexecute = Reexecute_Undefined; |
0 | 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(); | |
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246 _scloff = _monoff; |
0 | 247 _endoff = _monoff; |
248 _sp = 0; | |
249 } | |
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250 JVMState::JVMState(int stack_size) : |
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251 _method(NULL) { |
0 | 252 _bci = InvocationEntryBci; |
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253 _reexecute = Reexecute_Undefined; |
0 | 254 debug_only(_map = (SafePointNode*)-1); |
255 _caller = NULL; | |
256 _depth = 1; | |
257 _locoff = TypeFunc::Parms; | |
258 _stkoff = _locoff; | |
259 _monoff = _stkoff + stack_size; | |
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260 _scloff = _monoff; |
0 | 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; | |
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286 if (p->_reexecute != q->_reexecute) return false; |
0 | 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 | |
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317 #ifndef PRODUCT |
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318 |
0 | 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. | |
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322 static void format_helper( PhaseRegAlloc *regalloc, outputStream* st, Node *n, const char *msg, uint i, GrowableArray<SafePointScalarObjectNode*> *scobjs ) { |
0 | 323 if (n == NULL) { st->print(" NULL"); return; } |
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324 if (n->is_SafePointScalarObject()) { |
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325 // Scalar replacement. |
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326 SafePointScalarObjectNode* spobj = n->as_SafePointScalarObject(); |
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327 scobjs->append_if_missing(spobj); |
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328 int sco_n = scobjs->find(spobj); |
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329 assert(sco_n >= 0, ""); |
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330 st->print(" %s%d]=#ScObj" INT32_FORMAT, msg, i, sco_n); |
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331 return; |
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332 } |
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333 if (regalloc->node_regs_max_index() > 0 && |
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334 OptoReg::is_valid(regalloc->get_reg_first(n))) { // Check for undefined |
0 | 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; | |
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352 case Type::KlassPtr: |
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353 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,t->make_ptr()->isa_klassptr()->klass()); |
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354 break; |
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355 case Type::MetadataPtr: |
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356 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,t->make_ptr()->isa_metadataptr()->metadata()); |
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357 break; |
331
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358 case Type::NarrowOop: |
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359 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,t->make_ptr()->isa_oopptr()->const_oop()); |
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360 break; |
0 | 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(" #"); | |
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385 if (_method) { |
0 | 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()) { | |
63
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393 GrowableArray<SafePointScalarObjectNode*> scobjs; |
0 | 394 MachSafePointNode *mcall = n->as_MachSafePoint(); |
395 uint i; | |
396 // Print locals | |
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397 for (i = 0; i < (uint)loc_size(); i++) |
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398 format_helper(regalloc, st, mcall->local(this, i), "L[", i, &scobjs); |
0 | 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 | |
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404 format_helper(regalloc, st, mcall->stack(this, i), "STK[", i, &scobjs); |
0 | 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); | |
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409 if (regalloc->node_regs_max_index() > 0 && |
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410 OptoReg::is_valid(regalloc->get_reg_first(box))) { |
4777 | 411 box = BoxLockNode::box_node(box); |
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412 format_helper(regalloc, st, box, "MON-BOX[", i, &scobjs); |
0 | 413 } else { |
4777 | 414 OptoReg::Name box_reg = BoxLockNode::reg(box); |
0 | 415 st->print(" MON-BOX%d=%s+%d", |
416 i, | |
417 OptoReg::regname(OptoReg::c_frame_pointer), | |
418 regalloc->reg2offset(box_reg)); | |
419 } | |
460
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420 const char* obj_msg = "MON-OBJ["; |
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421 if (EliminateLocks) { |
4777 | 422 if (BoxLockNode::box_node(box)->is_eliminated()) |
460
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423 obj_msg = "MON-OBJ(LOCK ELIMINATED)["; |
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424 } |
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425 format_helper(regalloc, st, obj, obj_msg, i, &scobjs); |
63
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426 } |
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427 |
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428 for (i = 0; i < (uint)scobjs.length(); i++) { |
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429 // Scalar replaced objects. |
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430 st->print_cr(""); |
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431 st->print(" # ScObj" INT32_FORMAT " ", i); |
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432 SafePointScalarObjectNode* spobj = scobjs.at(i); |
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433 ciKlass* cik = spobj->bottom_type()->is_oopptr()->klass(); |
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434 assert(cik->is_instance_klass() || |
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435 cik->is_array_klass(), "Not supported allocation."); |
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436 ciInstanceKlass *iklass = NULL; |
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437 if (cik->is_instance_klass()) { |
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438 cik->print_name_on(st); |
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439 iklass = cik->as_instance_klass(); |
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440 } else if (cik->is_type_array_klass()) { |
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441 cik->as_array_klass()->base_element_type()->print_name_on(st); |
1040
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442 st->print("[%d]", spobj->n_fields()); |
63
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443 } else if (cik->is_obj_array_klass()) { |
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444 ciKlass* cie = cik->as_obj_array_klass()->base_element_klass(); |
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445 if (cie->is_instance_klass()) { |
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446 cie->print_name_on(st); |
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447 } else if (cie->is_type_array_klass()) { |
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448 cie->as_array_klass()->base_element_type()->print_name_on(st); |
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449 } else { |
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450 ShouldNotReachHere(); |
63
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451 } |
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452 st->print("[%d]", spobj->n_fields()); |
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453 int ndim = cik->as_array_klass()->dimension() - 1; |
63
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454 while (ndim-- > 0) { |
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455 st->print("[]"); |
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456 } |
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457 } |
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458 st->print("={"); |
63
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459 uint nf = spobj->n_fields(); |
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460 if (nf > 0) { |
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461 uint first_ind = spobj->first_index(); |
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462 Node* fld_node = mcall->in(first_ind); |
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463 ciField* cifield; |
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464 if (iklass != NULL) { |
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465 st->print(" ["); |
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466 cifield = iklass->nonstatic_field_at(0); |
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467 cifield->print_name_on(st); |
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468 format_helper(regalloc, st, fld_node, ":", 0, &scobjs); |
63
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469 } else { |
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470 format_helper(regalloc, st, fld_node, "[", 0, &scobjs); |
63
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471 } |
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472 for (uint j = 1; j < nf; j++) { |
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473 fld_node = mcall->in(first_ind+j); |
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474 if (iklass != NULL) { |
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475 st->print(", ["); |
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476 cifield = iklass->nonstatic_field_at(j); |
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477 cifield->print_name_on(st); |
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478 format_helper(regalloc, st, fld_node, ":", j, &scobjs); |
63
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479 } else { |
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480 format_helper(regalloc, st, fld_node, ", [", j, &scobjs); |
63
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481 } |
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482 } |
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483 } |
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484 st->print(" }"); |
0 | 485 } |
486 } | |
487 st->print_cr(""); | |
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488 if (caller() != NULL) caller()->format(regalloc, n, st); |
0 | 489 } |
490 | |
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491 |
0 | 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); | |
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516 if(_reexecute == Reexecute_True) |
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517 st->print(" reexecute"); |
0 | 518 } else { |
519 st->print(" runtime stub"); | |
520 } | |
521 if (caller() != NULL) caller()->dump_spec(st); | |
522 } | |
523 | |
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524 |
0 | 525 void JVMState::dump_on(outputStream* st) const { |
10278 | 526 bool print_map = _map && !((uintptr_t)_map & 1) && |
527 ((caller() == NULL) || (caller()->map() != _map)); | |
528 if (print_map) { | |
0 | 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 } | |
10278 | 537 _map->dump(Verbose ? 2 : 1); |
538 } | |
539 if (caller() != NULL) { | |
540 caller()->dump_on(st); | |
0 | 541 } |
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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=", |
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543 depth(), locoff(), stkoff(), argoff(), monoff(), scloff(), endoff(), monitor_depth(), sp(), bci(), should_reexecute()?"true":"false"); |
0 | 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); | |
900
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567 n->_reexecute = _reexecute; |
0 | 568 n->set_locoff(_locoff); |
569 n->set_stkoff(_stkoff); | |
570 n->set_monoff(_monoff); | |
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571 n->set_scloff(_scloff); |
0 | 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 | |
10278 | 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 | |
0 | 598 //============================================================================= |
599 uint CallNode::cmp( const Node &n ) const | |
600 { return _tf == ((CallNode&)n)._tf && _jvms == ((CallNode&)n)._jvms; } | |
601 #ifndef PRODUCT | |
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602 void CallNode::dump_req(outputStream *st) const { |
0 | 603 // Dump the required inputs, enclosed in '(' and ')' |
604 uint i; // Exit value of loop | |
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605 for (i = 0; i < req(); i++) { // For all required inputs |
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606 if (i == TypeFunc::Parms) st->print("("); |
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607 if (in(i)) st->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx); |
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608 else st->print("_ "); |
0 | 609 } |
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610 st->print(")"); |
0 | 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: | |
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642 return new (match->C) MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj); |
0 | 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 | |
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647 return new (match->C) MachProjNode(this,proj->_con, RegMask::Empty, (uint)OptoReg::Bad); |
0 | 648 |
649 case TypeFunc::Parms: { // Normal returns | |
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650 uint ideal_reg = tf()->range()->field_at(TypeFunc::Parms)->ideal_reg(); |
0 | 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() ); | |
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657 return new (match->C) MachProjNode(this,proj->_con,rm,ideal_reg); |
0 | 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 | |
65 | 673 // |
74
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674 // Determine whether the call could modify the field of the specified |
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675 // instance at the specified offset. |
65 | 676 // |
10278 | 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; | |
65 | 683 } |
10278 | 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; | |
65 | 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 | |
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757 void CallNode::extract_projections(CallProjections* projs, bool separate_io_proj) { |
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758 projs->fallthrough_proj = NULL; |
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759 projs->fallthrough_catchproj = NULL; |
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760 projs->fallthrough_ioproj = NULL; |
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761 projs->catchall_ioproj = NULL; |
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762 projs->catchall_catchproj = NULL; |
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763 projs->fallthrough_memproj = NULL; |
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764 projs->catchall_memproj = NULL; |
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765 projs->resproj = NULL; |
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766 projs->exobj = NULL; |
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767 |
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768 for (DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++) { |
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769 ProjNode *pn = fast_out(i)->as_Proj(); |
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770 if (pn->outcnt() == 0) continue; |
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771 switch (pn->_con) { |
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772 case TypeFunc::Control: |
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773 { |
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774 // For Control (fallthrough) and I_O (catch_all_index) we have CatchProj -> Catch -> Proj |
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775 projs->fallthrough_proj = pn; |
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776 DUIterator_Fast jmax, j = pn->fast_outs(jmax); |
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777 const Node *cn = pn->fast_out(j); |
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778 if (cn->is_Catch()) { |
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779 ProjNode *cpn = NULL; |
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780 for (DUIterator_Fast kmax, k = cn->fast_outs(kmax); k < kmax; k++) { |
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781 cpn = cn->fast_out(k)->as_Proj(); |
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782 assert(cpn->is_CatchProj(), "must be a CatchProjNode"); |
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783 if (cpn->_con == CatchProjNode::fall_through_index) |
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784 projs->fallthrough_catchproj = cpn; |
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785 else { |
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786 assert(cpn->_con == CatchProjNode::catch_all_index, "must be correct index."); |
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787 projs->catchall_catchproj = cpn; |
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788 } |
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789 } |
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790 } |
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791 break; |
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792 } |
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793 case TypeFunc::I_O: |
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794 if (pn->_is_io_use) |
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795 projs->catchall_ioproj = pn; |
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796 else |
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797 projs->fallthrough_ioproj = pn; |
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798 for (DUIterator j = pn->outs(); pn->has_out(j); j++) { |
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799 Node* e = pn->out(j); |
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800 if (e->Opcode() == Op_CreateEx && e->in(0)->is_CatchProj() && e->outcnt() > 0) { |
1080
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801 assert(projs->exobj == NULL, "only one"); |
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802 projs->exobj = e; |
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803 } |
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804 } |
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805 break; |
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806 case TypeFunc::Memory: |
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807 if (pn->_is_io_use) |
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808 projs->catchall_memproj = pn; |
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809 else |
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810 projs->fallthrough_memproj = pn; |
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811 break; |
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812 case TypeFunc::Parms: |
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813 projs->resproj = pn; |
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814 break; |
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815 default: |
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816 assert(false, "unexpected projection from allocation node."); |
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817 } |
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818 } |
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819 |
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820 // The resproj may not exist because the result couuld be ignored |
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821 // and the exception object may not exist if an exception handler |
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822 // swallows the exception but all the other must exist and be found. |
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823 assert(projs->fallthrough_proj != NULL, "must be found"); |
7473 | 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"); | |
1080
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828 if (separate_io_proj) { |
7473 | 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"); | |
1080
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831 } |
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832 } |
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833 |
7473 | 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 | |
1080
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856 |
0 | 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) { | |
305 | 1010 return remove_dead_region(phase, can_reshape) ? this : NULL; |
0 | 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(); | |
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1063 int scloff = jvms->scloff(); |
0 | 1064 int endoff = jvms->endoff(); |
1065 assert(endoff == (int)req(), "no other states or debug info after me"); | |
10278 | 1066 assert(jvms->scl_size() == 0, "parsed code should not have scalar objects"); |
0 | 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); | |
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1072 jvms->set_scloff(scloff + grow_by); |
0 | 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"); | |
10278 | 1082 assert((jvms()->scl_size() == 0), "parsed code should not have scalar objects"); |
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1083 int nextmon = jvms()->scloff(); |
0 | 1084 if (GenerateSynchronizationCode) { |
1085 add_req(lock->box_node()); | |
1086 add_req(lock->obj_node()); | |
1087 } else { | |
460
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1088 Node* top = Compile::current()->top(); |
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1089 add_req(top); |
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1090 add_req(top); |
0 | 1091 } |
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1092 jvms()->set_scloff(nextmon+MonitorEdges); |
0 | 1093 jvms()->set_endoff(req()); |
1094 } | |
1095 | |
1096 void SafePointNode::pop_monitor() { | |
1097 // Delete last monitor from debug info | |
10278 | 1098 assert((jvms()->scl_size() == 0), "parsed code should not have scalar objects"); |
0 | 1099 debug_only(int num_before_pop = jvms()->nof_monitors()); |
1100 const int MonitorEdges = (1<<JVMState::logMonitorEdges); | |
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1101 int scloff = jvms()->scloff(); |
0 | 1102 int endoff = jvms()->endoff(); |
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1103 int new_scloff = scloff - MonitorEdges; |
0 | 1104 int new_endoff = endoff - MonitorEdges; |
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1105 jvms()->set_scloff(new_scloff); |
0 | 1106 jvms()->set_endoff(new_endoff); |
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1107 while (scloff > new_scloff) del_req(--scloff); |
0 | 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 | |
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1131 //============== SafePointScalarObjectNode ============== |
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1132 |
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1133 SafePointScalarObjectNode::SafePointScalarObjectNode(const TypeOopPtr* tp, |
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1134 #ifdef ASSERT |
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1135 AllocateNode* alloc, |
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1136 #endif |
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1137 uint first_index, |
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1138 uint n_fields) : |
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1139 TypeNode(tp, 1), // 1 control input -- seems required. Get from root. |
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1140 #ifdef ASSERT |
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1141 _alloc(alloc), |
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1142 #endif |
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1143 _first_index(first_index), |
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1144 _n_fields(n_fields) |
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1145 { |
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1146 init_class_id(Class_SafePointScalarObject); |
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1147 } |
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1148 |
4115 | 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 } | |
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1154 |
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1155 uint SafePointScalarObjectNode::ideal_reg() const { |
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1156 return 0; // No matching to machine instruction |
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1157 } |
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1158 |
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1159 const RegMask &SafePointScalarObjectNode::in_RegMask(uint idx) const { |
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1160 return *(Compile::current()->matcher()->idealreg2debugmask[in(idx)->ideal_reg()]); |
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1161 } |
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1162 |
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1163 const RegMask &SafePointScalarObjectNode::out_RegMask() const { |
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1164 return RegMask::Empty; |
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1165 } |
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1166 |
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1167 uint SafePointScalarObjectNode::match_edge(uint idx) const { |
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1168 return 0; |
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1169 } |
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1170 |
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1171 SafePointScalarObjectNode* |
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1172 SafePointScalarObjectNode::clone(int jvms_adj, Dict* sosn_map) const { |
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1173 void* cached = (*sosn_map)[(void*)this]; |
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1174 if (cached != NULL) { |
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1175 return (SafePointScalarObjectNode*)cached; |
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1176 } |
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1177 SafePointScalarObjectNode* res = (SafePointScalarObjectNode*)Node::clone(); |
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1178 res->_first_index += jvms_adj; |
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1179 sosn_map->Insert((void*)this, (void*)res); |
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1180 return res; |
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1181 } |
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1182 |
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1183 |
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1184 #ifndef PRODUCT |
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1185 void SafePointScalarObjectNode::dump_spec(outputStream *st) const { |
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1186 st->print(" # fields@[%d..%d]", first_index(), |
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1187 first_index() + n_fields() - 1); |
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1188 } |
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1189 |
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1190 #endif |
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1191 |
0 | 1192 //============================================================================= |
1193 uint AllocateNode::size_of() const { return sizeof(*this); } | |
1194 | |
1195 AllocateNode::AllocateNode(Compile* C, const TypeFunc *atype, | |
1196 Node *ctrl, Node *mem, Node *abio, | |
1197 Node *size, Node *klass_node, Node *initial_test) | |
1198 : CallNode(atype, NULL, TypeRawPtr::BOTTOM) | |
1199 { | |
1200 init_class_id(Class_Allocate); | |
1201 init_flags(Flag_is_macro); | |
39
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1202 _is_scalar_replaceable = false; |
10278 | 1203 _is_non_escaping = false; |
0 | 1204 Node *topnode = C->top(); |
1205 | |
1206 init_req( TypeFunc::Control , ctrl ); | |
1207 init_req( TypeFunc::I_O , abio ); | |
1208 init_req( TypeFunc::Memory , mem ); | |
1209 init_req( TypeFunc::ReturnAdr, topnode ); | |
1210 init_req( TypeFunc::FramePtr , topnode ); | |
1211 init_req( AllocSize , size); | |
1212 init_req( KlassNode , klass_node); | |
1213 init_req( InitialTest , initial_test); | |
1214 init_req( ALength , topnode); | |
1215 C->add_macro_node(this); | |
1216 } | |
1217 | |
1218 //============================================================================= | |
704
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1219 Node* AllocateArrayNode::Ideal(PhaseGVN *phase, bool can_reshape) { |
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1220 if (remove_dead_region(phase, can_reshape)) return this; |
4115 | 1221 // Don't bother trying to transform a dead node |
1222 if (in(0) && in(0)->is_top()) return NULL; | |
704
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1223 |
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1224 const Type* type = phase->type(Ideal_length()); |
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1225 if (type->isa_int() && type->is_int()->_hi < 0) { |
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1226 if (can_reshape) { |
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1227 PhaseIterGVN *igvn = phase->is_IterGVN(); |
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1228 // Unreachable fall through path (negative array length), |
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1229 // the allocation can only throw so disconnect it. |
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1230 Node* proj = proj_out(TypeFunc::Control); |
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1231 Node* catchproj = NULL; |
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1232 if (proj != NULL) { |
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1233 for (DUIterator_Fast imax, i = proj->fast_outs(imax); i < imax; i++) { |
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1234 Node *cn = proj->fast_out(i); |
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1235 if (cn->is_Catch()) { |
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1236 catchproj = cn->as_Multi()->proj_out(CatchProjNode::fall_through_index); |
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1237 break; |
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1238 } |
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1239 } |
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1240 } |
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1241 if (catchproj != NULL && catchproj->outcnt() > 0 && |
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1242 (catchproj->outcnt() > 1 || |
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1243 catchproj->unique_out()->Opcode() != Op_Halt)) { |
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1244 assert(catchproj->is_CatchProj(), "must be a CatchProjNode"); |
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1245 Node* nproj = catchproj->clone(); |
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1246 igvn->register_new_node_with_optimizer(nproj); |
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1247 |
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1248 Node *frame = new (phase->C) ParmNode( phase->C->start(), TypeFunc::FramePtr ); |
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1249 frame = phase->transform(frame); |
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1250 // Halt & Catch Fire |
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1251 Node *halt = new (phase->C) HaltNode( nproj, frame ); |
704
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1252 phase->C->root()->add_req(halt); |
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1253 phase->transform(halt); |
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1254 |
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1255 igvn->replace_node(catchproj, phase->C->top()); |
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1256 return this; |
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1257 } |
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1258 } else { |
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1259 // Can't correct it during regular GVN so register for IGVN |
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1260 phase->C->record_for_igvn(this); |
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1261 } |
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1262 } |
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1263 return NULL; |
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1264 } |
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1265 |
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1266 // Retrieve the length from the AllocateArrayNode. Narrow the type with a |
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1267 // CastII, if appropriate. If we are not allowed to create new nodes, and |
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1268 // a CastII is appropriate, return NULL. |
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1269 Node *AllocateArrayNode::make_ideal_length(const TypeOopPtr* oop_type, PhaseTransform *phase, bool allow_new_nodes) { |
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1270 Node *length = in(AllocateNode::ALength); |
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1271 assert(length != NULL, "length is not null"); |
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1272 |
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1273 const TypeInt* length_type = phase->find_int_type(length); |
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1274 const TypeAryPtr* ary_type = oop_type->isa_aryptr(); |
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1275 |
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1276 if (ary_type != NULL && length_type != NULL) { |
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1277 const TypeInt* narrow_length_type = ary_type->narrow_size_type(length_type); |
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1278 if (narrow_length_type != length_type) { |
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1279 // Assert one of: |
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1280 // - the narrow_length is 0 |
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1281 // - the narrow_length is not wider than length |
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1282 assert(narrow_length_type == TypeInt::ZERO || |
10278 | 1283 length_type->is_con() && narrow_length_type->is_con() && |
1284 (narrow_length_type->_hi <= length_type->_lo) || | |
366
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1285 (narrow_length_type->_hi <= length_type->_hi && |
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1286 narrow_length_type->_lo >= length_type->_lo), |
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1287 "narrow type must be narrower than length type"); |
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1288 |
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1289 // Return NULL if new nodes are not allowed |
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1290 if (!allow_new_nodes) return NULL; |
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1291 // Create a cast which is control dependent on the initialization to |
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1292 // propagate the fact that the array length must be positive. |
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1293 length = new (phase->C) CastIINode(length, narrow_length_type); |
366
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1294 length->set_req(0, initialization()->proj_out(0)); |
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1295 } |
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1296 } |
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1297 |
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1298 return length; |
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1299 } |
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1300 |
0 | 1301 //============================================================================= |
1302 uint LockNode::size_of() const { return sizeof(*this); } | |
1303 | |
1304 // Redundant lock elimination | |
1305 // | |
1306 // There are various patterns of locking where we release and | |
1307 // immediately reacquire a lock in a piece of code where no operations | |
1308 // occur in between that would be observable. In those cases we can | |
1309 // skip releasing and reacquiring the lock without violating any | |
1310 // fairness requirements. Doing this around a loop could cause a lock | |
1311 // to be held for a very long time so we concentrate on non-looping | |
1312 // control flow. We also require that the operations are fully | |
1313 // redundant meaning that we don't introduce new lock operations on | |
1314 // some paths so to be able to eliminate it on others ala PRE. This | |
1315 // would probably require some more extensive graph manipulation to | |
1316 // guarantee that the memory edges were all handled correctly. | |
1317 // | |
1318 // Assuming p is a simple predicate which can't trap in any way and s | |
1319 // is a synchronized method consider this code: | |
1320 // | |
1321 // s(); | |
1322 // if (p) | |
1323 // s(); | |
1324 // else | |
1325 // s(); | |
1326 // s(); | |
1327 // | |
1328 // 1. The unlocks of the first call to s can be eliminated if the | |
1329 // locks inside the then and else branches are eliminated. | |
1330 // | |
1331 // 2. The unlocks of the then and else branches can be eliminated if | |
1332 // the lock of the final call to s is eliminated. | |
1333 // | |
1334 // Either of these cases subsumes the simple case of sequential control flow | |
1335 // | |
1336 // Addtionally we can eliminate versions without the else case: | |
1337 // | |
1338 // s(); | |
1339 // if (p) | |
1340 // s(); | |
1341 // s(); | |
1342 // | |
1343 // 3. In this case we eliminate the unlock of the first s, the lock | |
1344 // and unlock in the then case and the lock in the final s. | |
1345 // | |
1346 // Note also that in all these cases the then/else pieces don't have | |
1347 // to be trivial as long as they begin and end with synchronization | |
1348 // operations. | |
1349 // | |
1350 // s(); | |
1351 // if (p) | |
1352 // s(); | |
1353 // f(); | |
1354 // s(); | |
1355 // s(); | |
1356 // | |
1357 // The code will work properly for this case, leaving in the unlock | |
1358 // before the call to f and the relock after it. | |
1359 // | |
1360 // A potentially interesting case which isn't handled here is when the | |
1361 // locking is partially redundant. | |
1362 // | |
1363 // s(); | |
1364 // if (p) | |
1365 // s(); | |
1366 // | |
1367 // This could be eliminated putting unlocking on the else case and | |
1368 // eliminating the first unlock and the lock in the then side. | |
1369 // Alternatively the unlock could be moved out of the then side so it | |
1370 // was after the merge and the first unlock and second lock | |
1371 // eliminated. This might require less manipulation of the memory | |
1372 // state to get correct. | |
1373 // | |
1374 // Additionally we might allow work between a unlock and lock before | |
1375 // giving up eliminating the locks. The current code disallows any | |
1376 // conditional control flow between these operations. A formulation | |
1377 // similar to partial redundancy elimination computing the | |
1378 // availability of unlocking and the anticipatability of locking at a | |
1379 // program point would allow detection of fully redundant locking with | |
1380 // some amount of work in between. I'm not sure how often I really | |
1381 // think that would occur though. Most of the cases I've seen | |
1382 // indicate it's likely non-trivial work would occur in between. | |
1383 // There may be other more complicated constructs where we could | |
1384 // eliminate locking but I haven't seen any others appear as hot or | |
1385 // interesting. | |
1386 // | |
1387 // Locking and unlocking have a canonical form in ideal that looks | |
1388 // roughly like this: | |
1389 // | |
1390 // <obj> | |
1391 // | \\------+ | |
1392 // | \ \ | |
1393 // | BoxLock \ | |
1394 // | | | \ | |
1395 // | | \ \ | |
1396 // | | FastLock | |
1397 // | | / | |
1398 // | | / | |
1399 // | | | | |
1400 // | |
1401 // Lock | |
1402 // | | |
1403 // Proj #0 | |
1404 // | | |
1405 // MembarAcquire | |
1406 // | | |
1407 // Proj #0 | |
1408 // | |
1409 // MembarRelease | |
1410 // | | |
1411 // Proj #0 | |
1412 // | | |
1413 // Unlock | |
1414 // | | |
1415 // Proj #0 | |
1416 // | |
1417 // | |
1418 // This code proceeds by processing Lock nodes during PhaseIterGVN | |
1419 // and searching back through its control for the proper code | |
1420 // patterns. Once it finds a set of lock and unlock operations to | |
1421 // eliminate they are marked as eliminatable which causes the | |
1422 // expansion of the Lock and Unlock macro nodes to make the operation a NOP | |
1423 // | |
1424 //============================================================================= | |
1425 | |
1426 // | |
1427 // Utility function to skip over uninteresting control nodes. Nodes skipped are: | |
1428 // - copy regions. (These may not have been optimized away yet.) | |
1429 // - eliminated locking nodes | |
1430 // | |
1431 static Node *next_control(Node *ctrl) { | |
1432 if (ctrl == NULL) | |
1433 return NULL; | |
1434 while (1) { | |
1435 if (ctrl->is_Region()) { | |
1436 RegionNode *r = ctrl->as_Region(); | |
1437 Node *n = r->is_copy(); | |
1438 if (n == NULL) | |
1439 break; // hit a region, return it | |
1440 else | |
1441 ctrl = n; | |
1442 } else if (ctrl->is_Proj()) { | |
1443 Node *in0 = ctrl->in(0); | |
1444 if (in0->is_AbstractLock() && in0->as_AbstractLock()->is_eliminated()) { | |
1445 ctrl = in0->in(0); | |
1446 } else { | |
1447 break; | |
1448 } | |
1449 } else { | |
1450 break; // found an interesting control | |
1451 } | |
1452 } | |
1453 return ctrl; | |
1454 } | |
1455 // | |
1456 // Given a control, see if it's the control projection of an Unlock which | |
1457 // operating on the same object as lock. | |
1458 // | |
1459 bool AbstractLockNode::find_matching_unlock(const Node* ctrl, LockNode* lock, | |
1460 GrowableArray<AbstractLockNode*> &lock_ops) { | |
1461 ProjNode *ctrl_proj = (ctrl->is_Proj()) ? ctrl->as_Proj() : NULL; | |
1462 if (ctrl_proj != NULL && ctrl_proj->_con == TypeFunc::Control) { | |
1463 Node *n = ctrl_proj->in(0); | |
1464 if (n != NULL && n->is_Unlock()) { | |
1465 UnlockNode *unlock = n->as_Unlock(); | |
4778 | 1466 if (lock->obj_node()->eqv_uncast(unlock->obj_node()) && |
4777 | 1467 BoxLockNode::same_slot(lock->box_node(), unlock->box_node()) && |
1468 !unlock->is_eliminated()) { | |
0 | 1469 lock_ops.append(unlock); |
1470 return true; | |
1471 } | |
1472 } | |
1473 } | |
1474 return false; | |
1475 } | |
1476 | |
1477 // | |
1478 // Find the lock matching an unlock. Returns null if a safepoint | |
1479 // or complicated control is encountered first. | |
1480 LockNode *AbstractLockNode::find_matching_lock(UnlockNode* unlock) { | |
1481 LockNode *lock_result = NULL; | |
1482 // find the matching lock, or an intervening safepoint | |
1483 Node *ctrl = next_control(unlock->in(0)); | |
1484 while (1) { | |
1485 assert(ctrl != NULL, "invalid control graph"); | |
1486 assert(!ctrl->is_Start(), "missing lock for unlock"); | |
1487 if (ctrl->is_top()) break; // dead control path | |
1488 if (ctrl->is_Proj()) ctrl = ctrl->in(0); | |
1489 if (ctrl->is_SafePoint()) { | |
1490 break; // found a safepoint (may be the lock we are searching for) | |
1491 } else if (ctrl->is_Region()) { | |
1492 // Check for a simple diamond pattern. Punt on anything more complicated | |
1493 if (ctrl->req() == 3 && ctrl->in(1) != NULL && ctrl->in(2) != NULL) { | |
1494 Node *in1 = next_control(ctrl->in(1)); | |
1495 Node *in2 = next_control(ctrl->in(2)); | |
1496 if (((in1->is_IfTrue() && in2->is_IfFalse()) || | |
1497 (in2->is_IfTrue() && in1->is_IfFalse())) && (in1->in(0) == in2->in(0))) { | |
1498 ctrl = next_control(in1->in(0)->in(0)); | |
1499 } else { | |
1500 break; | |
1501 } | |
1502 } else { | |
1503 break; | |
1504 } | |
1505 } else { | |
1506 ctrl = next_control(ctrl->in(0)); // keep searching | |
1507 } | |
1508 } | |
1509 if (ctrl->is_Lock()) { | |
1510 LockNode *lock = ctrl->as_Lock(); | |
4778 | 1511 if (lock->obj_node()->eqv_uncast(unlock->obj_node()) && |
4777 | 1512 BoxLockNode::same_slot(lock->box_node(), unlock->box_node())) { |
0 | 1513 lock_result = lock; |
1514 } | |
1515 } | |
1516 return lock_result; | |
1517 } | |
1518 | |
1519 // This code corresponds to case 3 above. | |
1520 | |
1521 bool AbstractLockNode::find_lock_and_unlock_through_if(Node* node, LockNode* lock, | |
1522 GrowableArray<AbstractLockNode*> &lock_ops) { | |
1523 Node* if_node = node->in(0); | |
1524 bool if_true = node->is_IfTrue(); | |
1525 | |
1526 if (if_node->is_If() && if_node->outcnt() == 2 && (if_true || node->is_IfFalse())) { | |
1527 Node *lock_ctrl = next_control(if_node->in(0)); | |
1528 if (find_matching_unlock(lock_ctrl, lock, lock_ops)) { | |
1529 Node* lock1_node = NULL; | |
1530 ProjNode* proj = if_node->as_If()->proj_out(!if_true); | |
1531 if (if_true) { | |
1532 if (proj->is_IfFalse() && proj->outcnt() == 1) { | |
1533 lock1_node = proj->unique_out(); | |
1534 } | |
1535 } else { | |
1536 if (proj->is_IfTrue() && proj->outcnt() == 1) { | |
1537 lock1_node = proj->unique_out(); | |
1538 } | |
1539 } | |
1540 if (lock1_node != NULL && lock1_node->is_Lock()) { | |
1541 LockNode *lock1 = lock1_node->as_Lock(); | |
4778 | 1542 if (lock->obj_node()->eqv_uncast(lock1->obj_node()) && |
4777 | 1543 BoxLockNode::same_slot(lock->box_node(), lock1->box_node()) && |
1544 !lock1->is_eliminated()) { | |
0 | 1545 lock_ops.append(lock1); |
1546 return true; | |
1547 } | |
1548 } | |
1549 } | |
1550 } | |
1551 | |
1552 lock_ops.trunc_to(0); | |
1553 return false; | |
1554 } | |
1555 | |
1556 bool AbstractLockNode::find_unlocks_for_region(const RegionNode* region, LockNode* lock, | |
1557 GrowableArray<AbstractLockNode*> &lock_ops) { | |
1558 // check each control merging at this point for a matching unlock. | |
1559 // in(0) should be self edge so skip it. | |
1560 for (int i = 1; i < (int)region->req(); i++) { | |
1561 Node *in_node = next_control(region->in(i)); | |
1562 if (in_node != NULL) { | |
1563 if (find_matching_unlock(in_node, lock, lock_ops)) { | |
1564 // found a match so keep on checking. | |
1565 continue; | |
1566 } else if (find_lock_and_unlock_through_if(in_node, lock, lock_ops)) { | |
1567 continue; | |
1568 } | |
1569 | |
1570 // If we fall through to here then it was some kind of node we | |
1571 // don't understand or there wasn't a matching unlock, so give | |
1572 // up trying to merge locks. | |
1573 lock_ops.trunc_to(0); | |
1574 return false; | |
1575 } | |
1576 } | |
1577 return true; | |
1578 | |
1579 } | |
1580 | |
1581 #ifndef PRODUCT | |
1582 // | |
1583 // Create a counter which counts the number of times this lock is acquired | |
1584 // | |
1585 void AbstractLockNode::create_lock_counter(JVMState* state) { | |
1586 _counter = OptoRuntime::new_named_counter(state, NamedCounter::LockCounter); | |
1587 } | |
1588 | |
4777 | 1589 void AbstractLockNode::set_eliminated_lock_counter() { |
0 | 1590 if (_counter) { |
1591 // Update the counter to indicate that this lock was eliminated. | |
1592 // The counter update code will stay around even though the | |
1593 // optimizer will eliminate the lock operation itself. | |
1594 _counter->set_tag(NamedCounter::EliminatedLockCounter); | |
1595 } | |
4777 | 1596 } |
0 | 1597 #endif |
1598 | |
1599 //============================================================================= | |
1600 Node *LockNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1601 | |
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1602 // perform any generic optimizations first (returns 'this' or NULL) |
0 | 1603 Node *result = SafePointNode::Ideal(phase, can_reshape); |
4115 | 1604 if (result != NULL) return result; |
1605 // Don't bother trying to transform a dead node | |
1606 if (in(0) && in(0)->is_top()) return NULL; | |
0 | 1607 |
1608 // Now see if we can optimize away this lock. We don't actually | |
1609 // remove the locking here, we simply set the _eliminate flag which | |
1610 // prevents macro expansion from expanding the lock. Since we don't | |
1611 // modify the graph, the value returned from this function is the | |
1612 // one computed above. | |
4777 | 1613 if (can_reshape && EliminateLocks && !is_non_esc_obj()) { |
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1614 // |
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1615 // If we are locking an unescaped object, the lock/unlock is unnecessary |
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1616 // |
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1617 ConnectionGraph *cgr = phase->C->congraph(); |
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1618 if (cgr != NULL && cgr->not_global_escape(obj_node())) { |
4777 | 1619 assert(!is_eliminated() || is_coarsened(), "sanity"); |
1620 // The lock could be marked eliminated by lock coarsening | |
1621 // code during first IGVN before EA. Replace coarsened flag | |
1622 // to eliminate all associated locks/unlocks. | |
1623 this->set_non_esc_obj(); | |
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1624 return result; |
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1625 } |
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1626 |
0 | 1627 // |
1628 // Try lock coarsening | |
1629 // | |
1630 PhaseIterGVN* iter = phase->is_IterGVN(); | |
4115 | 1631 if (iter != NULL && !is_eliminated()) { |
0 | 1632 |
1633 GrowableArray<AbstractLockNode*> lock_ops; | |
1634 | |
1635 Node *ctrl = next_control(in(0)); | |
1636 | |
1637 // now search back for a matching Unlock | |
1638 if (find_matching_unlock(ctrl, this, lock_ops)) { | |
1639 // found an unlock directly preceding this lock. This is the | |
1640 // case of single unlock directly control dependent on a | |
1641 // single lock which is the trivial version of case 1 or 2. | |
1642 } else if (ctrl->is_Region() ) { | |
1643 if (find_unlocks_for_region(ctrl->as_Region(), this, lock_ops)) { | |
1644 // found lock preceded by multiple unlocks along all paths | |
1645 // joining at this point which is case 3 in description above. | |
1646 } | |
1647 } else { | |
1648 // see if this lock comes from either half of an if and the | |
1649 // predecessors merges unlocks and the other half of the if | |
1650 // performs a lock. | |
1651 if (find_lock_and_unlock_through_if(ctrl, this, lock_ops)) { | |
1652 // found unlock splitting to an if with locks on both branches. | |
1653 } | |
1654 } | |
1655 | |
1656 if (lock_ops.length() > 0) { | |
1657 // add ourselves to the list of locks to be eliminated. | |
1658 lock_ops.append(this); | |
1659 | |
1660 #ifndef PRODUCT | |
1661 if (PrintEliminateLocks) { | |
1662 int locks = 0; | |
1663 int unlocks = 0; | |
1664 for (int i = 0; i < lock_ops.length(); i++) { | |
1665 AbstractLockNode* lock = lock_ops.at(i); | |
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1666 if (lock->Opcode() == Op_Lock) |
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1667 locks++; |
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1668 else |
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1669 unlocks++; |
0 | 1670 if (Verbose) { |
1671 lock->dump(1); | |
1672 } | |
1673 } | |
1674 tty->print_cr("***Eliminated %d unlocks and %d locks", unlocks, locks); | |
1675 } | |
1676 #endif | |
1677 | |
1678 // for each of the identified locks, mark them | |
1679 // as eliminatable | |
1680 for (int i = 0; i < lock_ops.length(); i++) { | |
1681 AbstractLockNode* lock = lock_ops.at(i); | |
1682 | |
4777 | 1683 // Mark it eliminated by coarsening and update any counters |
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1684 lock->set_coarsened(); |
0 | 1685 } |
4115 | 1686 } else if (ctrl->is_Region() && |
0 | 1687 iter->_worklist.member(ctrl)) { |
1688 // We weren't able to find any opportunities but the region this | |
1689 // lock is control dependent on hasn't been processed yet so put | |
1690 // this lock back on the worklist so we can check again once any | |
1691 // region simplification has occurred. | |
1692 iter->_worklist.push(this); | |
1693 } | |
1694 } | |
1695 } | |
1696 | |
1697 return result; | |
1698 } | |
1699 | |
1700 //============================================================================= | |
4777 | 1701 bool LockNode::is_nested_lock_region() { |
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1702 BoxLockNode* box = box_node()->as_BoxLock(); |
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1703 int stk_slot = box->stack_slot(); |
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1704 if (stk_slot <= 0) |
4777 | 1705 return false; // External lock or it is not Box (Phi node). |
1706 | |
1707 // Ignore complex cases: merged locks or multiple locks. | |
1708 Node* obj = obj_node(); | |
1709 LockNode* unique_lock = NULL; | |
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1710 if (!box->is_simple_lock_region(&unique_lock, obj) || |
4777 | 1711 (unique_lock != this)) { |
1712 return false; | |
1713 } | |
1714 | |
1715 // Look for external lock for the same object. | |
1716 SafePointNode* sfn = this->as_SafePoint(); | |
1717 JVMState* youngest_jvms = sfn->jvms(); | |
1718 int max_depth = youngest_jvms->depth(); | |
1719 for (int depth = 1; depth <= max_depth; depth++) { | |
1720 JVMState* jvms = youngest_jvms->of_depth(depth); | |
1721 int num_mon = jvms->nof_monitors(); | |
1722 // Loop over monitors | |
1723 for (int idx = 0; idx < num_mon; idx++) { | |
1724 Node* obj_node = sfn->monitor_obj(jvms, idx); | |
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1725 BoxLockNode* box_node = sfn->monitor_box(jvms, idx)->as_BoxLock(); |
4778 | 1726 if ((box_node->stack_slot() < stk_slot) && obj_node->eqv_uncast(obj)) { |
4777 | 1727 return true; |
1728 } | |
1729 } | |
1730 } | |
1731 return false; | |
1732 } | |
1733 | |
1734 //============================================================================= | |
0 | 1735 uint UnlockNode::size_of() const { return sizeof(*this); } |
1736 | |
1737 //============================================================================= | |
1738 Node *UnlockNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1739 | |
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1740 // perform any generic optimizations first (returns 'this' or NULL) |
4115 | 1741 Node *result = SafePointNode::Ideal(phase, can_reshape); |
1742 if (result != NULL) return result; | |
1743 // Don't bother trying to transform a dead node | |
1744 if (in(0) && in(0)->is_top()) return NULL; | |
0 | 1745 |
1746 // Now see if we can optimize away this unlock. We don't actually | |
1747 // remove the unlocking here, we simply set the _eliminate flag which | |
1748 // prevents macro expansion from expanding the unlock. Since we don't | |
1749 // modify the graph, the value returned from this function is the | |
1750 // one computed above. | |
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1751 // Escape state is defined after Parse phase. |
4777 | 1752 if (can_reshape && EliminateLocks && !is_non_esc_obj()) { |
0 | 1753 // |
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1754 // If we are unlocking an unescaped object, the lock/unlock is unnecessary. |
0 | 1755 // |
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1756 ConnectionGraph *cgr = phase->C->congraph(); |
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1757 if (cgr != NULL && cgr->not_global_escape(obj_node())) { |
4777 | 1758 assert(!is_eliminated() || is_coarsened(), "sanity"); |
1759 // The lock could be marked eliminated by lock coarsening | |
1760 // code during first IGVN before EA. Replace coarsened flag | |
1761 // to eliminate all associated locks/unlocks. | |
1762 this->set_non_esc_obj(); | |
0 | 1763 } |
1764 } | |
1765 return result; | |
1766 } |