Mercurial > hg > truffle
annotate src/share/vm/opto/callnode.cpp @ 305:ab075d07f1ba
6736417: Fastdebug C2 crashes in StoreBNode::Ideal
Summary: The result of step_through_mergemem() and remove_dead_region() is not checked in some cases.
Reviewed-by: never
| author | kvn |
|---|---|
| date | Wed, 27 Aug 2008 09:15:46 -0700 |
| parents | 02a35ad4adf8 |
| children | cecd8eb4e0ca |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 1997-2008 Sun Microsystems, Inc. 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 * | |
| 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(); | |
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233 _scloff = _monoff; |
| 0 | 234 _endoff = _monoff; |
| 235 _sp = 0; | |
| 236 } | |
| 237 JVMState::JVMState(int stack_size) { | |
| 238 _method = NULL; | |
| 239 _bci = InvocationEntryBci; | |
| 240 debug_only(_map = (SafePointNode*)-1); | |
| 241 _caller = NULL; | |
| 242 _depth = 1; | |
| 243 _locoff = TypeFunc::Parms; | |
| 244 _stkoff = _locoff; | |
| 245 _monoff = _stkoff + stack_size; | |
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246 _scloff = _monoff; |
| 0 | 247 _endoff = _monoff; |
| 248 _sp = 0; | |
| 249 } | |
| 250 | |
| 251 //--------------------------------of_depth------------------------------------- | |
| 252 JVMState* JVMState::of_depth(int d) const { | |
| 253 const JVMState* jvmp = this; | |
| 254 assert(0 < d && (uint)d <= depth(), "oob"); | |
| 255 for (int skip = depth() - d; skip > 0; skip--) { | |
| 256 jvmp = jvmp->caller(); | |
| 257 } | |
| 258 assert(jvmp->depth() == (uint)d, "found the right one"); | |
| 259 return (JVMState*)jvmp; | |
| 260 } | |
| 261 | |
| 262 //-----------------------------same_calls_as----------------------------------- | |
| 263 bool JVMState::same_calls_as(const JVMState* that) const { | |
| 264 if (this == that) return true; | |
| 265 if (this->depth() != that->depth()) return false; | |
| 266 const JVMState* p = this; | |
| 267 const JVMState* q = that; | |
| 268 for (;;) { | |
| 269 if (p->_method != q->_method) return false; | |
| 270 if (p->_method == NULL) return true; // bci is irrelevant | |
| 271 if (p->_bci != q->_bci) return false; | |
| 272 p = p->caller(); | |
| 273 q = q->caller(); | |
| 274 if (p == q) return true; | |
| 275 assert(p != NULL && q != NULL, "depth check ensures we don't run off end"); | |
| 276 } | |
| 277 } | |
| 278 | |
| 279 //------------------------------debug_start------------------------------------ | |
| 280 uint JVMState::debug_start() const { | |
| 281 debug_only(JVMState* jvmroot = of_depth(1)); | |
| 282 assert(jvmroot->locoff() <= this->locoff(), "youngest JVMState must be last"); | |
| 283 return of_depth(1)->locoff(); | |
| 284 } | |
| 285 | |
| 286 //-------------------------------debug_end------------------------------------- | |
| 287 uint JVMState::debug_end() const { | |
| 288 debug_only(JVMState* jvmroot = of_depth(1)); | |
| 289 assert(jvmroot->endoff() <= this->endoff(), "youngest JVMState must be last"); | |
| 290 return endoff(); | |
| 291 } | |
| 292 | |
| 293 //------------------------------debug_depth------------------------------------ | |
| 294 uint JVMState::debug_depth() const { | |
| 295 uint total = 0; | |
| 296 for (const JVMState* jvmp = this; jvmp != NULL; jvmp = jvmp->caller()) { | |
| 297 total += jvmp->debug_size(); | |
| 298 } | |
| 299 return total; | |
| 300 } | |
| 301 | |
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302 #ifndef PRODUCT |
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303 |
| 0 | 304 //------------------------------format_helper---------------------------------- |
| 305 // Given an allocation (a Chaitin object) and a Node decide if the Node carries | |
| 306 // any defined value or not. If it does, print out the register or constant. | |
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307 static void format_helper( PhaseRegAlloc *regalloc, outputStream* st, Node *n, const char *msg, uint i, GrowableArray<SafePointScalarObjectNode*> *scobjs ) { |
| 0 | 308 if (n == NULL) { st->print(" NULL"); return; } |
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309 if (n->is_SafePointScalarObject()) { |
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310 // Scalar replacement. |
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311 SafePointScalarObjectNode* spobj = n->as_SafePointScalarObject(); |
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312 scobjs->append_if_missing(spobj); |
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313 int sco_n = scobjs->find(spobj); |
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314 assert(sco_n >= 0, ""); |
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315 st->print(" %s%d]=#ScObj" INT32_FORMAT, msg, i, sco_n); |
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316 return; |
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317 } |
| 0 | 318 if( OptoReg::is_valid(regalloc->get_reg_first(n))) { // Check for undefined |
| 319 char buf[50]; | |
| 320 regalloc->dump_register(n,buf); | |
| 321 st->print(" %s%d]=%s",msg,i,buf); | |
| 322 } else { // No register, but might be constant | |
| 323 const Type *t = n->bottom_type(); | |
| 324 switch (t->base()) { | |
| 325 case Type::Int: | |
| 326 st->print(" %s%d]=#"INT32_FORMAT,msg,i,t->is_int()->get_con()); | |
| 327 break; | |
| 328 case Type::AnyPtr: | |
| 329 assert( t == TypePtr::NULL_PTR, "" ); | |
| 330 st->print(" %s%d]=#NULL",msg,i); | |
| 331 break; | |
| 332 case Type::AryPtr: | |
| 333 case Type::KlassPtr: | |
| 334 case Type::InstPtr: | |
| 335 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,t->isa_oopptr()->const_oop()); | |
| 336 break; | |
| 337 case Type::RawPtr: | |
| 338 st->print(" %s%d]=#Raw" INTPTR_FORMAT,msg,i,t->is_rawptr()); | |
| 339 break; | |
| 340 case Type::DoubleCon: | |
| 341 st->print(" %s%d]=#%fD",msg,i,t->is_double_constant()->_d); | |
| 342 break; | |
| 343 case Type::FloatCon: | |
| 344 st->print(" %s%d]=#%fF",msg,i,t->is_float_constant()->_f); | |
| 345 break; | |
| 346 case Type::Long: | |
| 347 st->print(" %s%d]=#"INT64_FORMAT,msg,i,t->is_long()->get_con()); | |
| 348 break; | |
| 349 case Type::Half: | |
| 350 case Type::Top: | |
| 351 st->print(" %s%d]=_",msg,i); | |
| 352 break; | |
| 353 default: ShouldNotReachHere(); | |
| 354 } | |
| 355 } | |
| 356 } | |
| 357 | |
| 358 //------------------------------format----------------------------------------- | |
| 359 void JVMState::format(PhaseRegAlloc *regalloc, const Node *n, outputStream* st) const { | |
| 360 st->print(" #"); | |
| 361 if( _method ) { | |
| 362 _method->print_short_name(st); | |
| 363 st->print(" @ bci:%d ",_bci); | |
| 364 } else { | |
| 365 st->print_cr(" runtime stub "); | |
| 366 return; | |
| 367 } | |
| 368 if (n->is_MachSafePoint()) { | |
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369 GrowableArray<SafePointScalarObjectNode*> scobjs; |
| 0 | 370 MachSafePointNode *mcall = n->as_MachSafePoint(); |
| 371 uint i; | |
| 372 // Print locals | |
| 373 for( i = 0; i < (uint)loc_size(); i++ ) | |
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374 format_helper( regalloc, st, mcall->local(this, i), "L[", i, &scobjs ); |
| 0 | 375 // Print stack |
| 376 for (i = 0; i < (uint)stk_size(); i++) { | |
| 377 if ((uint)(_stkoff + i) >= mcall->len()) | |
| 378 st->print(" oob "); | |
| 379 else | |
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380 format_helper( regalloc, st, mcall->stack(this, i), "STK[", i, &scobjs ); |
| 0 | 381 } |
| 382 for (i = 0; (int)i < nof_monitors(); i++) { | |
| 383 Node *box = mcall->monitor_box(this, i); | |
| 384 Node *obj = mcall->monitor_obj(this, i); | |
| 385 if ( OptoReg::is_valid(regalloc->get_reg_first(box)) ) { | |
| 386 while( !box->is_BoxLock() ) box = box->in(1); | |
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387 format_helper( regalloc, st, box, "MON-BOX[", i, &scobjs ); |
| 0 | 388 } else { |
| 389 OptoReg::Name box_reg = BoxLockNode::stack_slot(box); | |
| 390 st->print(" MON-BOX%d=%s+%d", | |
| 391 i, | |
| 392 OptoReg::regname(OptoReg::c_frame_pointer), | |
| 393 regalloc->reg2offset(box_reg)); | |
| 394 } | |
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395 format_helper( regalloc, st, obj, "MON-OBJ[", i, &scobjs ); |
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396 } |
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397 |
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398 for (i = 0; i < (uint)scobjs.length(); i++) { |
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399 // Scalar replaced objects. |
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400 st->print_cr(""); |
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401 st->print(" # ScObj" INT32_FORMAT " ", i); |
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402 SafePointScalarObjectNode* spobj = scobjs.at(i); |
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403 ciKlass* cik = spobj->bottom_type()->is_oopptr()->klass(); |
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404 assert(cik->is_instance_klass() || |
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405 cik->is_array_klass(), "Not supported allocation."); |
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406 ciInstanceKlass *iklass = NULL; |
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407 if (cik->is_instance_klass()) { |
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408 cik->print_name_on(st); |
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409 iklass = cik->as_instance_klass(); |
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410 } else if (cik->is_type_array_klass()) { |
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411 cik->as_array_klass()->base_element_type()->print_name_on(st); |
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412 st->print("[%d]=", spobj->n_fields()); |
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413 } else if (cik->is_obj_array_klass()) { |
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414 ciType* cie = cik->as_array_klass()->base_element_type(); |
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415 int ndim = 1; |
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416 while (cie->is_obj_array_klass()) { |
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417 ndim += 1; |
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418 cie = cie->as_array_klass()->base_element_type(); |
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419 } |
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420 cie->print_name_on(st); |
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421 while (ndim-- > 0) { |
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422 st->print("[]"); |
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423 } |
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424 st->print("[%d]=", spobj->n_fields()); |
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425 } |
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426 st->print("{"); |
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427 uint nf = spobj->n_fields(); |
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428 if (nf > 0) { |
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429 uint first_ind = spobj->first_index(); |
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430 Node* fld_node = mcall->in(first_ind); |
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431 ciField* cifield; |
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432 if (iklass != NULL) { |
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433 st->print(" ["); |
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434 cifield = iklass->nonstatic_field_at(0); |
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435 cifield->print_name_on(st); |
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436 format_helper( regalloc, st, fld_node, ":", 0, &scobjs ); |
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437 } else { |
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438 format_helper( regalloc, st, fld_node, "[", 0, &scobjs ); |
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439 } |
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440 for (uint j = 1; j < nf; j++) { |
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441 fld_node = mcall->in(first_ind+j); |
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442 if (iklass != NULL) { |
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443 st->print(", ["); |
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444 cifield = iklass->nonstatic_field_at(j); |
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445 cifield->print_name_on(st); |
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446 format_helper( regalloc, st, fld_node, ":", j, &scobjs ); |
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447 } else { |
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448 format_helper( regalloc, st, fld_node, ", [", j, &scobjs ); |
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449 } |
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450 } |
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451 } |
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452 st->print(" }"); |
| 0 | 453 } |
| 454 } | |
| 455 st->print_cr(""); | |
| 456 if (caller() != NULL) caller()->format(regalloc, n, st); | |
| 457 } | |
| 458 | |
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459 |
| 0 | 460 void JVMState::dump_spec(outputStream *st) const { |
| 461 if (_method != NULL) { | |
| 462 bool printed = false; | |
| 463 if (!Verbose) { | |
| 464 // The JVMS dumps make really, really long lines. | |
| 465 // Take out the most boring parts, which are the package prefixes. | |
| 466 char buf[500]; | |
| 467 stringStream namest(buf, sizeof(buf)); | |
| 468 _method->print_short_name(&namest); | |
| 469 if (namest.count() < sizeof(buf)) { | |
| 470 const char* name = namest.base(); | |
| 471 if (name[0] == ' ') ++name; | |
| 472 const char* endcn = strchr(name, ':'); // end of class name | |
| 473 if (endcn == NULL) endcn = strchr(name, '('); | |
| 474 if (endcn == NULL) endcn = name + strlen(name); | |
| 475 while (endcn > name && endcn[-1] != '.' && endcn[-1] != '/') | |
| 476 --endcn; | |
| 477 st->print(" %s", endcn); | |
| 478 printed = true; | |
| 479 } | |
| 480 } | |
| 481 if (!printed) | |
| 482 _method->print_short_name(st); | |
| 483 st->print(" @ bci:%d",_bci); | |
| 484 } else { | |
| 485 st->print(" runtime stub"); | |
| 486 } | |
| 487 if (caller() != NULL) caller()->dump_spec(st); | |
| 488 } | |
| 489 | |
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490 |
| 0 | 491 void JVMState::dump_on(outputStream* st) const { |
| 492 if (_map && !((uintptr_t)_map & 1)) { | |
| 493 if (_map->len() > _map->req()) { // _map->has_exceptions() | |
| 494 Node* ex = _map->in(_map->req()); // _map->next_exception() | |
| 495 // skip the first one; it's already being printed | |
| 496 while (ex != NULL && ex->len() > ex->req()) { | |
| 497 ex = ex->in(ex->req()); // ex->next_exception() | |
| 498 ex->dump(1); | |
| 499 } | |
| 500 } | |
| 501 _map->dump(2); | |
| 502 } | |
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503 st->print("JVMS depth=%d loc=%d stk=%d mon=%d scalar=%d end=%d mondepth=%d sp=%d bci=%d method=", |
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504 depth(), locoff(), stkoff(), monoff(), scloff(), endoff(), monitor_depth(), sp(), bci()); |
| 0 | 505 if (_method == NULL) { |
| 506 st->print_cr("(none)"); | |
| 507 } else { | |
| 508 _method->print_name(st); | |
| 509 st->cr(); | |
| 510 if (bci() >= 0 && bci() < _method->code_size()) { | |
| 511 st->print(" bc: "); | |
| 512 _method->print_codes_on(bci(), bci()+1, st); | |
| 513 } | |
| 514 } | |
| 515 if (caller() != NULL) { | |
| 516 caller()->dump_on(st); | |
| 517 } | |
| 518 } | |
| 519 | |
| 520 // Extra way to dump a jvms from the debugger, | |
| 521 // to avoid a bug with C++ member function calls. | |
| 522 void dump_jvms(JVMState* jvms) { | |
| 523 jvms->dump(); | |
| 524 } | |
| 525 #endif | |
| 526 | |
| 527 //--------------------------clone_shallow-------------------------------------- | |
| 528 JVMState* JVMState::clone_shallow(Compile* C) const { | |
| 529 JVMState* n = has_method() ? new (C) JVMState(_method, _caller) : new (C) JVMState(0); | |
| 530 n->set_bci(_bci); | |
| 531 n->set_locoff(_locoff); | |
| 532 n->set_stkoff(_stkoff); | |
| 533 n->set_monoff(_monoff); | |
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534 n->set_scloff(_scloff); |
| 0 | 535 n->set_endoff(_endoff); |
| 536 n->set_sp(_sp); | |
| 537 n->set_map(_map); | |
| 538 return n; | |
| 539 } | |
| 540 | |
| 541 //---------------------------clone_deep---------------------------------------- | |
| 542 JVMState* JVMState::clone_deep(Compile* C) const { | |
| 543 JVMState* n = clone_shallow(C); | |
| 544 for (JVMState* p = n; p->_caller != NULL; p = p->_caller) { | |
| 545 p->_caller = p->_caller->clone_shallow(C); | |
| 546 } | |
| 547 assert(n->depth() == depth(), "sanity"); | |
| 548 assert(n->debug_depth() == debug_depth(), "sanity"); | |
| 549 return n; | |
| 550 } | |
| 551 | |
| 552 //============================================================================= | |
| 553 uint CallNode::cmp( const Node &n ) const | |
| 554 { return _tf == ((CallNode&)n)._tf && _jvms == ((CallNode&)n)._jvms; } | |
| 555 #ifndef PRODUCT | |
| 556 void CallNode::dump_req() const { | |
| 557 // Dump the required inputs, enclosed in '(' and ')' | |
| 558 uint i; // Exit value of loop | |
| 559 for( i=0; i<req(); i++ ) { // For all required inputs | |
| 560 if( i == TypeFunc::Parms ) tty->print("("); | |
| 561 if( in(i) ) tty->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx); | |
| 562 else tty->print("_ "); | |
| 563 } | |
| 564 tty->print(")"); | |
| 565 } | |
| 566 | |
| 567 void CallNode::dump_spec(outputStream *st) const { | |
| 568 st->print(" "); | |
| 569 tf()->dump_on(st); | |
| 570 if (_cnt != COUNT_UNKNOWN) st->print(" C=%f",_cnt); | |
| 571 if (jvms() != NULL) jvms()->dump_spec(st); | |
| 572 } | |
| 573 #endif | |
| 574 | |
| 575 const Type *CallNode::bottom_type() const { return tf()->range(); } | |
| 576 const Type *CallNode::Value(PhaseTransform *phase) const { | |
| 577 if (phase->type(in(0)) == Type::TOP) return Type::TOP; | |
| 578 return tf()->range(); | |
| 579 } | |
| 580 | |
| 581 //------------------------------calling_convention----------------------------- | |
| 582 void CallNode::calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const { | |
| 583 // Use the standard compiler calling convention | |
| 584 Matcher::calling_convention( sig_bt, parm_regs, argcnt, true ); | |
| 585 } | |
| 586 | |
| 587 | |
| 588 //------------------------------match------------------------------------------ | |
| 589 // Construct projections for control, I/O, memory-fields, ..., and | |
| 590 // return result(s) along with their RegMask info | |
| 591 Node *CallNode::match( const ProjNode *proj, const Matcher *match ) { | |
| 592 switch (proj->_con) { | |
| 593 case TypeFunc::Control: | |
| 594 case TypeFunc::I_O: | |
| 595 case TypeFunc::Memory: | |
| 596 return new (match->C, 1) MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj); | |
| 597 | |
| 598 case TypeFunc::Parms+1: // For LONG & DOUBLE returns | |
| 599 assert(tf()->_range->field_at(TypeFunc::Parms+1) == Type::HALF, ""); | |
| 600 // 2nd half of doubles and longs | |
| 601 return new (match->C, 1) MachProjNode(this,proj->_con, RegMask::Empty, (uint)OptoReg::Bad); | |
| 602 | |
| 603 case TypeFunc::Parms: { // Normal returns | |
| 604 uint ideal_reg = Matcher::base2reg[tf()->range()->field_at(TypeFunc::Parms)->base()]; | |
| 605 OptoRegPair regs = is_CallRuntime() | |
| 606 ? match->c_return_value(ideal_reg,true) // Calls into C runtime | |
| 607 : match-> return_value(ideal_reg,true); // Calls into compiled Java code | |
| 608 RegMask rm = RegMask(regs.first()); | |
| 609 if( OptoReg::is_valid(regs.second()) ) | |
| 610 rm.Insert( regs.second() ); | |
| 611 return new (match->C, 1) MachProjNode(this,proj->_con,rm,ideal_reg); | |
| 612 } | |
| 613 | |
| 614 case TypeFunc::ReturnAdr: | |
| 615 case TypeFunc::FramePtr: | |
| 616 default: | |
| 617 ShouldNotReachHere(); | |
| 618 } | |
| 619 return NULL; | |
| 620 } | |
| 621 | |
| 622 // Do we Match on this edge index or not? Match no edges | |
| 623 uint CallNode::match_edge(uint idx) const { | |
| 624 return 0; | |
| 625 } | |
| 626 | |
| 65 | 627 // |
|
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628 // Determine whether the call could modify the field of the specified |
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629 // instance at the specified offset. |
| 65 | 630 // |
| 631 bool CallNode::may_modify(const TypePtr *addr_t, PhaseTransform *phase) { | |
| 632 const TypeOopPtr *adrInst_t = addr_t->isa_oopptr(); | |
| 633 | |
| 247 | 634 // If not an OopPtr or not an instance type, assume the worst. |
| 635 // Note: currently this method is called only for instance types. | |
| 636 if (adrInst_t == NULL || !adrInst_t->is_known_instance()) { | |
| 65 | 637 return true; |
| 638 } | |
| 247 | 639 // The instance_id is set only for scalar-replaceable allocations which |
| 640 // are not passed as arguments according to Escape Analysis. | |
| 65 | 641 return false; |
| 642 } | |
| 643 | |
| 644 // Does this call have a direct reference to n other than debug information? | |
| 645 bool CallNode::has_non_debug_use(Node *n) { | |
| 646 const TypeTuple * d = tf()->domain(); | |
| 647 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { | |
| 648 Node *arg = in(i); | |
| 649 if (arg == n) { | |
| 650 return true; | |
| 651 } | |
| 652 } | |
| 653 return false; | |
| 654 } | |
| 655 | |
| 656 // Returns the unique CheckCastPP of a call | |
| 657 // or 'this' if there are several CheckCastPP | |
| 658 // or returns NULL if there is no one. | |
| 659 Node *CallNode::result_cast() { | |
| 660 Node *cast = NULL; | |
| 661 | |
| 662 Node *p = proj_out(TypeFunc::Parms); | |
| 663 if (p == NULL) | |
| 664 return NULL; | |
| 665 | |
| 666 for (DUIterator_Fast imax, i = p->fast_outs(imax); i < imax; i++) { | |
| 667 Node *use = p->fast_out(i); | |
| 668 if (use->is_CheckCastPP()) { | |
| 669 if (cast != NULL) { | |
| 670 return this; // more than 1 CheckCastPP | |
| 671 } | |
| 672 cast = use; | |
| 673 } | |
| 674 } | |
| 675 return cast; | |
| 676 } | |
| 677 | |
| 678 | |
| 0 | 679 //============================================================================= |
| 680 uint CallJavaNode::size_of() const { return sizeof(*this); } | |
| 681 uint CallJavaNode::cmp( const Node &n ) const { | |
| 682 CallJavaNode &call = (CallJavaNode&)n; | |
| 683 return CallNode::cmp(call) && _method == call._method; | |
| 684 } | |
| 685 #ifndef PRODUCT | |
| 686 void CallJavaNode::dump_spec(outputStream *st) const { | |
| 687 if( _method ) _method->print_short_name(st); | |
| 688 CallNode::dump_spec(st); | |
| 689 } | |
| 690 #endif | |
| 691 | |
| 692 //============================================================================= | |
| 693 uint CallStaticJavaNode::size_of() const { return sizeof(*this); } | |
| 694 uint CallStaticJavaNode::cmp( const Node &n ) const { | |
| 695 CallStaticJavaNode &call = (CallStaticJavaNode&)n; | |
| 696 return CallJavaNode::cmp(call); | |
| 697 } | |
| 698 | |
| 699 //----------------------------uncommon_trap_request---------------------------- | |
| 700 // If this is an uncommon trap, return the request code, else zero. | |
| 701 int CallStaticJavaNode::uncommon_trap_request() const { | |
| 702 if (_name != NULL && !strcmp(_name, "uncommon_trap")) { | |
| 703 return extract_uncommon_trap_request(this); | |
| 704 } | |
| 705 return 0; | |
| 706 } | |
| 707 int CallStaticJavaNode::extract_uncommon_trap_request(const Node* call) { | |
| 708 #ifndef PRODUCT | |
| 709 if (!(call->req() > TypeFunc::Parms && | |
| 710 call->in(TypeFunc::Parms) != NULL && | |
| 711 call->in(TypeFunc::Parms)->is_Con())) { | |
| 712 assert(_in_dump_cnt != 0, "OK if dumping"); | |
| 713 tty->print("[bad uncommon trap]"); | |
| 714 return 0; | |
| 715 } | |
| 716 #endif | |
| 717 return call->in(TypeFunc::Parms)->bottom_type()->is_int()->get_con(); | |
| 718 } | |
| 719 | |
| 720 #ifndef PRODUCT | |
| 721 void CallStaticJavaNode::dump_spec(outputStream *st) const { | |
| 722 st->print("# Static "); | |
| 723 if (_name != NULL) { | |
| 724 st->print("%s", _name); | |
| 725 int trap_req = uncommon_trap_request(); | |
| 726 if (trap_req != 0) { | |
| 727 char buf[100]; | |
| 728 st->print("(%s)", | |
| 729 Deoptimization::format_trap_request(buf, sizeof(buf), | |
| 730 trap_req)); | |
| 731 } | |
| 732 st->print(" "); | |
| 733 } | |
| 734 CallJavaNode::dump_spec(st); | |
| 735 } | |
| 736 #endif | |
| 737 | |
| 738 //============================================================================= | |
| 739 uint CallDynamicJavaNode::size_of() const { return sizeof(*this); } | |
| 740 uint CallDynamicJavaNode::cmp( const Node &n ) const { | |
| 741 CallDynamicJavaNode &call = (CallDynamicJavaNode&)n; | |
| 742 return CallJavaNode::cmp(call); | |
| 743 } | |
| 744 #ifndef PRODUCT | |
| 745 void CallDynamicJavaNode::dump_spec(outputStream *st) const { | |
| 746 st->print("# Dynamic "); | |
| 747 CallJavaNode::dump_spec(st); | |
| 748 } | |
| 749 #endif | |
| 750 | |
| 751 //============================================================================= | |
| 752 uint CallRuntimeNode::size_of() const { return sizeof(*this); } | |
| 753 uint CallRuntimeNode::cmp( const Node &n ) const { | |
| 754 CallRuntimeNode &call = (CallRuntimeNode&)n; | |
| 755 return CallNode::cmp(call) && !strcmp(_name,call._name); | |
| 756 } | |
| 757 #ifndef PRODUCT | |
| 758 void CallRuntimeNode::dump_spec(outputStream *st) const { | |
| 759 st->print("# "); | |
| 760 st->print(_name); | |
| 761 CallNode::dump_spec(st); | |
| 762 } | |
| 763 #endif | |
| 764 | |
| 765 //------------------------------calling_convention----------------------------- | |
| 766 void CallRuntimeNode::calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const { | |
| 767 Matcher::c_calling_convention( sig_bt, parm_regs, argcnt ); | |
| 768 } | |
| 769 | |
| 770 //============================================================================= | |
| 771 //------------------------------calling_convention----------------------------- | |
| 772 | |
| 773 | |
| 774 //============================================================================= | |
| 775 #ifndef PRODUCT | |
| 776 void CallLeafNode::dump_spec(outputStream *st) const { | |
| 777 st->print("# "); | |
| 778 st->print(_name); | |
| 779 CallNode::dump_spec(st); | |
| 780 } | |
| 781 #endif | |
| 782 | |
| 783 //============================================================================= | |
| 784 | |
| 785 void SafePointNode::set_local(JVMState* jvms, uint idx, Node *c) { | |
| 786 assert(verify_jvms(jvms), "jvms must match"); | |
| 787 int loc = jvms->locoff() + idx; | |
| 788 if (in(loc)->is_top() && idx > 0 && !c->is_top() ) { | |
| 789 // If current local idx is top then local idx - 1 could | |
| 790 // be a long/double that needs to be killed since top could | |
| 791 // represent the 2nd half ofthe long/double. | |
| 792 uint ideal = in(loc -1)->ideal_reg(); | |
| 793 if (ideal == Op_RegD || ideal == Op_RegL) { | |
| 794 // set other (low index) half to top | |
| 795 set_req(loc - 1, in(loc)); | |
| 796 } | |
| 797 } | |
| 798 set_req(loc, c); | |
| 799 } | |
| 800 | |
| 801 uint SafePointNode::size_of() const { return sizeof(*this); } | |
| 802 uint SafePointNode::cmp( const Node &n ) const { | |
| 803 return (&n == this); // Always fail except on self | |
| 804 } | |
| 805 | |
| 806 //-------------------------set_next_exception---------------------------------- | |
| 807 void SafePointNode::set_next_exception(SafePointNode* n) { | |
| 808 assert(n == NULL || n->Opcode() == Op_SafePoint, "correct value for next_exception"); | |
| 809 if (len() == req()) { | |
| 810 if (n != NULL) add_prec(n); | |
| 811 } else { | |
| 812 set_prec(req(), n); | |
| 813 } | |
| 814 } | |
| 815 | |
| 816 | |
| 817 //----------------------------next_exception----------------------------------- | |
| 818 SafePointNode* SafePointNode::next_exception() const { | |
| 819 if (len() == req()) { | |
| 820 return NULL; | |
| 821 } else { | |
| 822 Node* n = in(req()); | |
| 823 assert(n == NULL || n->Opcode() == Op_SafePoint, "no other uses of prec edges"); | |
| 824 return (SafePointNode*) n; | |
| 825 } | |
| 826 } | |
| 827 | |
| 828 | |
| 829 //------------------------------Ideal------------------------------------------ | |
| 830 // Skip over any collapsed Regions | |
| 831 Node *SafePointNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 305 | 832 return remove_dead_region(phase, can_reshape) ? this : NULL; |
| 0 | 833 } |
| 834 | |
| 835 //------------------------------Identity--------------------------------------- | |
| 836 // Remove obviously duplicate safepoints | |
| 837 Node *SafePointNode::Identity( PhaseTransform *phase ) { | |
| 838 | |
| 839 // If you have back to back safepoints, remove one | |
| 840 if( in(TypeFunc::Control)->is_SafePoint() ) | |
| 841 return in(TypeFunc::Control); | |
| 842 | |
| 843 if( in(0)->is_Proj() ) { | |
| 844 Node *n0 = in(0)->in(0); | |
| 845 // Check if he is a call projection (except Leaf Call) | |
| 846 if( n0->is_Catch() ) { | |
| 847 n0 = n0->in(0)->in(0); | |
| 848 assert( n0->is_Call(), "expect a call here" ); | |
| 849 } | |
| 850 if( n0->is_Call() && n0->as_Call()->guaranteed_safepoint() ) { | |
| 851 // Useless Safepoint, so remove it | |
| 852 return in(TypeFunc::Control); | |
| 853 } | |
| 854 } | |
| 855 | |
| 856 return this; | |
| 857 } | |
| 858 | |
| 859 //------------------------------Value------------------------------------------ | |
| 860 const Type *SafePointNode::Value( PhaseTransform *phase ) const { | |
| 861 if( phase->type(in(0)) == Type::TOP ) return Type::TOP; | |
| 862 if( phase->eqv( in(0), this ) ) return Type::TOP; // Dead infinite loop | |
| 863 return Type::CONTROL; | |
| 864 } | |
| 865 | |
| 866 #ifndef PRODUCT | |
| 867 void SafePointNode::dump_spec(outputStream *st) const { | |
| 868 st->print(" SafePoint "); | |
| 869 } | |
| 870 #endif | |
| 871 | |
| 872 const RegMask &SafePointNode::in_RegMask(uint idx) const { | |
| 873 if( idx < TypeFunc::Parms ) return RegMask::Empty; | |
| 874 // Values outside the domain represent debug info | |
| 875 return *(Compile::current()->matcher()->idealreg2debugmask[in(idx)->ideal_reg()]); | |
| 876 } | |
| 877 const RegMask &SafePointNode::out_RegMask() const { | |
| 878 return RegMask::Empty; | |
| 879 } | |
| 880 | |
| 881 | |
| 882 void SafePointNode::grow_stack(JVMState* jvms, uint grow_by) { | |
| 883 assert((int)grow_by > 0, "sanity"); | |
| 884 int monoff = jvms->monoff(); | |
|
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885 int scloff = jvms->scloff(); |
| 0 | 886 int endoff = jvms->endoff(); |
| 887 assert(endoff == (int)req(), "no other states or debug info after me"); | |
| 888 Node* top = Compile::current()->top(); | |
| 889 for (uint i = 0; i < grow_by; i++) { | |
| 890 ins_req(monoff, top); | |
| 891 } | |
| 892 jvms->set_monoff(monoff + grow_by); | |
|
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893 jvms->set_scloff(scloff + grow_by); |
| 0 | 894 jvms->set_endoff(endoff + grow_by); |
| 895 } | |
| 896 | |
| 897 void SafePointNode::push_monitor(const FastLockNode *lock) { | |
| 898 // Add a LockNode, which points to both the original BoxLockNode (the | |
| 899 // stack space for the monitor) and the Object being locked. | |
| 900 const int MonitorEdges = 2; | |
| 901 assert(JVMState::logMonitorEdges == exact_log2(MonitorEdges), "correct MonitorEdges"); | |
| 902 assert(req() == jvms()->endoff(), "correct sizing"); | |
|
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903 int nextmon = jvms()->scloff(); |
| 0 | 904 if (GenerateSynchronizationCode) { |
| 905 add_req(lock->box_node()); | |
| 906 add_req(lock->obj_node()); | |
| 907 } else { | |
| 908 add_req(NULL); | |
| 909 add_req(NULL); | |
| 910 } | |
|
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911 jvms()->set_scloff(nextmon+MonitorEdges); |
| 0 | 912 jvms()->set_endoff(req()); |
| 913 } | |
| 914 | |
| 915 void SafePointNode::pop_monitor() { | |
| 916 // Delete last monitor from debug info | |
| 917 debug_only(int num_before_pop = jvms()->nof_monitors()); | |
| 918 const int MonitorEdges = (1<<JVMState::logMonitorEdges); | |
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919 int scloff = jvms()->scloff(); |
| 0 | 920 int endoff = jvms()->endoff(); |
|
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921 int new_scloff = scloff - MonitorEdges; |
| 0 | 922 int new_endoff = endoff - MonitorEdges; |
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923 jvms()->set_scloff(new_scloff); |
| 0 | 924 jvms()->set_endoff(new_endoff); |
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925 while (scloff > new_scloff) del_req(--scloff); |
| 0 | 926 assert(jvms()->nof_monitors() == num_before_pop-1, ""); |
| 927 } | |
| 928 | |
| 929 Node *SafePointNode::peek_monitor_box() const { | |
| 930 int mon = jvms()->nof_monitors() - 1; | |
| 931 assert(mon >= 0, "most have a monitor"); | |
| 932 return monitor_box(jvms(), mon); | |
| 933 } | |
| 934 | |
| 935 Node *SafePointNode::peek_monitor_obj() const { | |
| 936 int mon = jvms()->nof_monitors() - 1; | |
| 937 assert(mon >= 0, "most have a monitor"); | |
| 938 return monitor_obj(jvms(), mon); | |
| 939 } | |
| 940 | |
| 941 // Do we Match on this edge index or not? Match no edges | |
| 942 uint SafePointNode::match_edge(uint idx) const { | |
| 943 if( !needs_polling_address_input() ) | |
| 944 return 0; | |
| 945 | |
| 946 return (TypeFunc::Parms == idx); | |
| 947 } | |
| 948 | |
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949 //============== SafePointScalarObjectNode ============== |
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950 |
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951 SafePointScalarObjectNode::SafePointScalarObjectNode(const TypeOopPtr* tp, |
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952 #ifdef ASSERT |
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953 AllocateNode* alloc, |
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954 #endif |
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955 uint first_index, |
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956 uint n_fields) : |
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957 TypeNode(tp, 1), // 1 control input -- seems required. Get from root. |
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958 #ifdef ASSERT |
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959 _alloc(alloc), |
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960 #endif |
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961 _first_index(first_index), |
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962 _n_fields(n_fields) |
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963 { |
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964 init_class_id(Class_SafePointScalarObject); |
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965 } |
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966 |
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967 |
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968 uint SafePointScalarObjectNode::ideal_reg() const { |
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969 return 0; // No matching to machine instruction |
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970 } |
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971 |
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972 const RegMask &SafePointScalarObjectNode::in_RegMask(uint idx) const { |
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973 return *(Compile::current()->matcher()->idealreg2debugmask[in(idx)->ideal_reg()]); |
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974 } |
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975 |
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976 const RegMask &SafePointScalarObjectNode::out_RegMask() const { |
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977 return RegMask::Empty; |
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978 } |
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979 |
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980 uint SafePointScalarObjectNode::match_edge(uint idx) const { |
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981 return 0; |
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982 } |
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983 |
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984 SafePointScalarObjectNode* |
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985 SafePointScalarObjectNode::clone(int jvms_adj, Dict* sosn_map) const { |
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986 void* cached = (*sosn_map)[(void*)this]; |
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987 if (cached != NULL) { |
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988 return (SafePointScalarObjectNode*)cached; |
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989 } |
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990 Compile* C = Compile::current(); |
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991 SafePointScalarObjectNode* res = (SafePointScalarObjectNode*)Node::clone(); |
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992 res->_first_index += jvms_adj; |
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993 sosn_map->Insert((void*)this, (void*)res); |
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994 return res; |
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995 } |
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996 |
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997 |
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998 #ifndef PRODUCT |
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999 void SafePointScalarObjectNode::dump_spec(outputStream *st) const { |
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1000 st->print(" # fields@[%d..%d]", first_index(), |
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1001 first_index() + n_fields() - 1); |
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1002 } |
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1003 |
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1004 #endif |
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1005 |
| 0 | 1006 //============================================================================= |
| 1007 uint AllocateNode::size_of() const { return sizeof(*this); } | |
| 1008 | |
| 1009 AllocateNode::AllocateNode(Compile* C, const TypeFunc *atype, | |
| 1010 Node *ctrl, Node *mem, Node *abio, | |
| 1011 Node *size, Node *klass_node, Node *initial_test) | |
| 1012 : CallNode(atype, NULL, TypeRawPtr::BOTTOM) | |
| 1013 { | |
| 1014 init_class_id(Class_Allocate); | |
| 1015 init_flags(Flag_is_macro); | |
|
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1016 _is_scalar_replaceable = false; |
| 0 | 1017 Node *topnode = C->top(); |
| 1018 | |
| 1019 init_req( TypeFunc::Control , ctrl ); | |
| 1020 init_req( TypeFunc::I_O , abio ); | |
| 1021 init_req( TypeFunc::Memory , mem ); | |
| 1022 init_req( TypeFunc::ReturnAdr, topnode ); | |
| 1023 init_req( TypeFunc::FramePtr , topnode ); | |
| 1024 init_req( AllocSize , size); | |
| 1025 init_req( KlassNode , klass_node); | |
| 1026 init_req( InitialTest , initial_test); | |
| 1027 init_req( ALength , topnode); | |
| 1028 C->add_macro_node(this); | |
| 1029 } | |
| 1030 | |
| 1031 //============================================================================= | |
| 1032 uint AllocateArrayNode::size_of() const { return sizeof(*this); } | |
| 1033 | |
| 1034 //============================================================================= | |
| 1035 uint LockNode::size_of() const { return sizeof(*this); } | |
| 1036 | |
| 1037 // Redundant lock elimination | |
| 1038 // | |
| 1039 // There are various patterns of locking where we release and | |
| 1040 // immediately reacquire a lock in a piece of code where no operations | |
| 1041 // occur in between that would be observable. In those cases we can | |
| 1042 // skip releasing and reacquiring the lock without violating any | |
| 1043 // fairness requirements. Doing this around a loop could cause a lock | |
| 1044 // to be held for a very long time so we concentrate on non-looping | |
| 1045 // control flow. We also require that the operations are fully | |
| 1046 // redundant meaning that we don't introduce new lock operations on | |
| 1047 // some paths so to be able to eliminate it on others ala PRE. This | |
| 1048 // would probably require some more extensive graph manipulation to | |
| 1049 // guarantee that the memory edges were all handled correctly. | |
| 1050 // | |
| 1051 // Assuming p is a simple predicate which can't trap in any way and s | |
| 1052 // is a synchronized method consider this code: | |
| 1053 // | |
| 1054 // s(); | |
| 1055 // if (p) | |
| 1056 // s(); | |
| 1057 // else | |
| 1058 // s(); | |
| 1059 // s(); | |
| 1060 // | |
| 1061 // 1. The unlocks of the first call to s can be eliminated if the | |
| 1062 // locks inside the then and else branches are eliminated. | |
| 1063 // | |
| 1064 // 2. The unlocks of the then and else branches can be eliminated if | |
| 1065 // the lock of the final call to s is eliminated. | |
| 1066 // | |
| 1067 // Either of these cases subsumes the simple case of sequential control flow | |
| 1068 // | |
| 1069 // Addtionally we can eliminate versions without the else case: | |
| 1070 // | |
| 1071 // s(); | |
| 1072 // if (p) | |
| 1073 // s(); | |
| 1074 // s(); | |
| 1075 // | |
| 1076 // 3. In this case we eliminate the unlock of the first s, the lock | |
| 1077 // and unlock in the then case and the lock in the final s. | |
| 1078 // | |
| 1079 // Note also that in all these cases the then/else pieces don't have | |
| 1080 // to be trivial as long as they begin and end with synchronization | |
| 1081 // operations. | |
| 1082 // | |
| 1083 // s(); | |
| 1084 // if (p) | |
| 1085 // s(); | |
| 1086 // f(); | |
| 1087 // s(); | |
| 1088 // s(); | |
| 1089 // | |
| 1090 // The code will work properly for this case, leaving in the unlock | |
| 1091 // before the call to f and the relock after it. | |
| 1092 // | |
| 1093 // A potentially interesting case which isn't handled here is when the | |
| 1094 // locking is partially redundant. | |
| 1095 // | |
| 1096 // s(); | |
| 1097 // if (p) | |
| 1098 // s(); | |
| 1099 // | |
| 1100 // This could be eliminated putting unlocking on the else case and | |
| 1101 // eliminating the first unlock and the lock in the then side. | |
| 1102 // Alternatively the unlock could be moved out of the then side so it | |
| 1103 // was after the merge and the first unlock and second lock | |
| 1104 // eliminated. This might require less manipulation of the memory | |
| 1105 // state to get correct. | |
| 1106 // | |
| 1107 // Additionally we might allow work between a unlock and lock before | |
| 1108 // giving up eliminating the locks. The current code disallows any | |
| 1109 // conditional control flow between these operations. A formulation | |
| 1110 // similar to partial redundancy elimination computing the | |
| 1111 // availability of unlocking and the anticipatability of locking at a | |
| 1112 // program point would allow detection of fully redundant locking with | |
| 1113 // some amount of work in between. I'm not sure how often I really | |
| 1114 // think that would occur though. Most of the cases I've seen | |
| 1115 // indicate it's likely non-trivial work would occur in between. | |
| 1116 // There may be other more complicated constructs where we could | |
| 1117 // eliminate locking but I haven't seen any others appear as hot or | |
| 1118 // interesting. | |
| 1119 // | |
| 1120 // Locking and unlocking have a canonical form in ideal that looks | |
| 1121 // roughly like this: | |
| 1122 // | |
| 1123 // <obj> | |
| 1124 // | \\------+ | |
| 1125 // | \ \ | |
| 1126 // | BoxLock \ | |
| 1127 // | | | \ | |
| 1128 // | | \ \ | |
| 1129 // | | FastLock | |
| 1130 // | | / | |
| 1131 // | | / | |
| 1132 // | | | | |
| 1133 // | |
| 1134 // Lock | |
| 1135 // | | |
| 1136 // Proj #0 | |
| 1137 // | | |
| 1138 // MembarAcquire | |
| 1139 // | | |
| 1140 // Proj #0 | |
| 1141 // | |
| 1142 // MembarRelease | |
| 1143 // | | |
| 1144 // Proj #0 | |
| 1145 // | | |
| 1146 // Unlock | |
| 1147 // | | |
| 1148 // Proj #0 | |
| 1149 // | |
| 1150 // | |
| 1151 // This code proceeds by processing Lock nodes during PhaseIterGVN | |
| 1152 // and searching back through its control for the proper code | |
| 1153 // patterns. Once it finds a set of lock and unlock operations to | |
| 1154 // eliminate they are marked as eliminatable which causes the | |
| 1155 // expansion of the Lock and Unlock macro nodes to make the operation a NOP | |
| 1156 // | |
| 1157 //============================================================================= | |
| 1158 | |
| 1159 // | |
| 1160 // Utility function to skip over uninteresting control nodes. Nodes skipped are: | |
| 1161 // - copy regions. (These may not have been optimized away yet.) | |
| 1162 // - eliminated locking nodes | |
| 1163 // | |
| 1164 static Node *next_control(Node *ctrl) { | |
| 1165 if (ctrl == NULL) | |
| 1166 return NULL; | |
| 1167 while (1) { | |
| 1168 if (ctrl->is_Region()) { | |
| 1169 RegionNode *r = ctrl->as_Region(); | |
| 1170 Node *n = r->is_copy(); | |
| 1171 if (n == NULL) | |
| 1172 break; // hit a region, return it | |
| 1173 else | |
| 1174 ctrl = n; | |
| 1175 } else if (ctrl->is_Proj()) { | |
| 1176 Node *in0 = ctrl->in(0); | |
| 1177 if (in0->is_AbstractLock() && in0->as_AbstractLock()->is_eliminated()) { | |
| 1178 ctrl = in0->in(0); | |
| 1179 } else { | |
| 1180 break; | |
| 1181 } | |
| 1182 } else { | |
| 1183 break; // found an interesting control | |
| 1184 } | |
| 1185 } | |
| 1186 return ctrl; | |
| 1187 } | |
| 1188 // | |
| 1189 // Given a control, see if it's the control projection of an Unlock which | |
| 1190 // operating on the same object as lock. | |
| 1191 // | |
| 1192 bool AbstractLockNode::find_matching_unlock(const Node* ctrl, LockNode* lock, | |
| 1193 GrowableArray<AbstractLockNode*> &lock_ops) { | |
| 1194 ProjNode *ctrl_proj = (ctrl->is_Proj()) ? ctrl->as_Proj() : NULL; | |
| 1195 if (ctrl_proj != NULL && ctrl_proj->_con == TypeFunc::Control) { | |
| 1196 Node *n = ctrl_proj->in(0); | |
| 1197 if (n != NULL && n->is_Unlock()) { | |
| 1198 UnlockNode *unlock = n->as_Unlock(); | |
| 1199 if ((lock->obj_node() == unlock->obj_node()) && | |
| 1200 (lock->box_node() == unlock->box_node()) && !unlock->is_eliminated()) { | |
| 1201 lock_ops.append(unlock); | |
| 1202 return true; | |
| 1203 } | |
| 1204 } | |
| 1205 } | |
| 1206 return false; | |
| 1207 } | |
| 1208 | |
| 1209 // | |
| 1210 // Find the lock matching an unlock. Returns null if a safepoint | |
| 1211 // or complicated control is encountered first. | |
| 1212 LockNode *AbstractLockNode::find_matching_lock(UnlockNode* unlock) { | |
| 1213 LockNode *lock_result = NULL; | |
| 1214 // find the matching lock, or an intervening safepoint | |
| 1215 Node *ctrl = next_control(unlock->in(0)); | |
| 1216 while (1) { | |
| 1217 assert(ctrl != NULL, "invalid control graph"); | |
| 1218 assert(!ctrl->is_Start(), "missing lock for unlock"); | |
| 1219 if (ctrl->is_top()) break; // dead control path | |
| 1220 if (ctrl->is_Proj()) ctrl = ctrl->in(0); | |
| 1221 if (ctrl->is_SafePoint()) { | |
| 1222 break; // found a safepoint (may be the lock we are searching for) | |
| 1223 } else if (ctrl->is_Region()) { | |
| 1224 // Check for a simple diamond pattern. Punt on anything more complicated | |
| 1225 if (ctrl->req() == 3 && ctrl->in(1) != NULL && ctrl->in(2) != NULL) { | |
| 1226 Node *in1 = next_control(ctrl->in(1)); | |
| 1227 Node *in2 = next_control(ctrl->in(2)); | |
| 1228 if (((in1->is_IfTrue() && in2->is_IfFalse()) || | |
| 1229 (in2->is_IfTrue() && in1->is_IfFalse())) && (in1->in(0) == in2->in(0))) { | |
| 1230 ctrl = next_control(in1->in(0)->in(0)); | |
| 1231 } else { | |
| 1232 break; | |
| 1233 } | |
| 1234 } else { | |
| 1235 break; | |
| 1236 } | |
| 1237 } else { | |
| 1238 ctrl = next_control(ctrl->in(0)); // keep searching | |
| 1239 } | |
| 1240 } | |
| 1241 if (ctrl->is_Lock()) { | |
| 1242 LockNode *lock = ctrl->as_Lock(); | |
| 1243 if ((lock->obj_node() == unlock->obj_node()) && | |
| 1244 (lock->box_node() == unlock->box_node())) { | |
| 1245 lock_result = lock; | |
| 1246 } | |
| 1247 } | |
| 1248 return lock_result; | |
| 1249 } | |
| 1250 | |
| 1251 // This code corresponds to case 3 above. | |
| 1252 | |
| 1253 bool AbstractLockNode::find_lock_and_unlock_through_if(Node* node, LockNode* lock, | |
| 1254 GrowableArray<AbstractLockNode*> &lock_ops) { | |
| 1255 Node* if_node = node->in(0); | |
| 1256 bool if_true = node->is_IfTrue(); | |
| 1257 | |
| 1258 if (if_node->is_If() && if_node->outcnt() == 2 && (if_true || node->is_IfFalse())) { | |
| 1259 Node *lock_ctrl = next_control(if_node->in(0)); | |
| 1260 if (find_matching_unlock(lock_ctrl, lock, lock_ops)) { | |
| 1261 Node* lock1_node = NULL; | |
| 1262 ProjNode* proj = if_node->as_If()->proj_out(!if_true); | |
| 1263 if (if_true) { | |
| 1264 if (proj->is_IfFalse() && proj->outcnt() == 1) { | |
| 1265 lock1_node = proj->unique_out(); | |
| 1266 } | |
| 1267 } else { | |
| 1268 if (proj->is_IfTrue() && proj->outcnt() == 1) { | |
| 1269 lock1_node = proj->unique_out(); | |
| 1270 } | |
| 1271 } | |
| 1272 if (lock1_node != NULL && lock1_node->is_Lock()) { | |
| 1273 LockNode *lock1 = lock1_node->as_Lock(); | |
| 1274 if ((lock->obj_node() == lock1->obj_node()) && | |
| 1275 (lock->box_node() == lock1->box_node()) && !lock1->is_eliminated()) { | |
| 1276 lock_ops.append(lock1); | |
| 1277 return true; | |
| 1278 } | |
| 1279 } | |
| 1280 } | |
| 1281 } | |
| 1282 | |
| 1283 lock_ops.trunc_to(0); | |
| 1284 return false; | |
| 1285 } | |
| 1286 | |
| 1287 bool AbstractLockNode::find_unlocks_for_region(const RegionNode* region, LockNode* lock, | |
| 1288 GrowableArray<AbstractLockNode*> &lock_ops) { | |
| 1289 // check each control merging at this point for a matching unlock. | |
| 1290 // in(0) should be self edge so skip it. | |
| 1291 for (int i = 1; i < (int)region->req(); i++) { | |
| 1292 Node *in_node = next_control(region->in(i)); | |
| 1293 if (in_node != NULL) { | |
| 1294 if (find_matching_unlock(in_node, lock, lock_ops)) { | |
| 1295 // found a match so keep on checking. | |
| 1296 continue; | |
| 1297 } else if (find_lock_and_unlock_through_if(in_node, lock, lock_ops)) { | |
| 1298 continue; | |
| 1299 } | |
| 1300 | |
| 1301 // If we fall through to here then it was some kind of node we | |
| 1302 // don't understand or there wasn't a matching unlock, so give | |
| 1303 // up trying to merge locks. | |
| 1304 lock_ops.trunc_to(0); | |
| 1305 return false; | |
| 1306 } | |
| 1307 } | |
| 1308 return true; | |
| 1309 | |
| 1310 } | |
| 1311 | |
| 1312 #ifndef PRODUCT | |
| 1313 // | |
| 1314 // Create a counter which counts the number of times this lock is acquired | |
| 1315 // | |
| 1316 void AbstractLockNode::create_lock_counter(JVMState* state) { | |
| 1317 _counter = OptoRuntime::new_named_counter(state, NamedCounter::LockCounter); | |
| 1318 } | |
| 1319 #endif | |
| 1320 | |
| 1321 void AbstractLockNode::set_eliminated() { | |
| 1322 _eliminate = true; | |
| 1323 #ifndef PRODUCT | |
| 1324 if (_counter) { | |
| 1325 // Update the counter to indicate that this lock was eliminated. | |
| 1326 // The counter update code will stay around even though the | |
| 1327 // optimizer will eliminate the lock operation itself. | |
| 1328 _counter->set_tag(NamedCounter::EliminatedLockCounter); | |
| 1329 } | |
| 1330 #endif | |
| 1331 } | |
| 1332 | |
| 1333 //============================================================================= | |
| 1334 Node *LockNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 1335 | |
|
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1336 // perform any generic optimizations first (returns 'this' or NULL) |
| 0 | 1337 Node *result = SafePointNode::Ideal(phase, can_reshape); |
| 1338 | |
| 1339 // Now see if we can optimize away this lock. We don't actually | |
| 1340 // remove the locking here, we simply set the _eliminate flag which | |
| 1341 // prevents macro expansion from expanding the lock. Since we don't | |
| 1342 // modify the graph, the value returned from this function is the | |
| 1343 // one computed above. | |
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1344 if (result == NULL && can_reshape && EliminateLocks && !is_eliminated()) { |
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1345 // |
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1346 // If we are locking an unescaped object, the lock/unlock is unnecessary |
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1347 // |
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1348 ConnectionGraph *cgr = Compile::current()->congraph(); |
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1349 PointsToNode::EscapeState es = PointsToNode::GlobalEscape; |
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1350 if (cgr != NULL) |
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1351 es = cgr->escape_state(obj_node(), phase); |
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1352 if (es != PointsToNode::UnknownEscape && es != PointsToNode::GlobalEscape) { |
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1353 // Mark it eliminated to update any counters |
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1354 this->set_eliminated(); |
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1355 return result; |
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1356 } |
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1357 |
| 0 | 1358 // |
| 1359 // Try lock coarsening | |
| 1360 // | |
| 1361 PhaseIterGVN* iter = phase->is_IterGVN(); | |
| 1362 if (iter != NULL) { | |
| 1363 | |
| 1364 GrowableArray<AbstractLockNode*> lock_ops; | |
| 1365 | |
| 1366 Node *ctrl = next_control(in(0)); | |
| 1367 | |
| 1368 // now search back for a matching Unlock | |
| 1369 if (find_matching_unlock(ctrl, this, lock_ops)) { | |
| 1370 // found an unlock directly preceding this lock. This is the | |
| 1371 // case of single unlock directly control dependent on a | |
| 1372 // single lock which is the trivial version of case 1 or 2. | |
| 1373 } else if (ctrl->is_Region() ) { | |
| 1374 if (find_unlocks_for_region(ctrl->as_Region(), this, lock_ops)) { | |
| 1375 // found lock preceded by multiple unlocks along all paths | |
| 1376 // joining at this point which is case 3 in description above. | |
| 1377 } | |
| 1378 } else { | |
| 1379 // see if this lock comes from either half of an if and the | |
| 1380 // predecessors merges unlocks and the other half of the if | |
| 1381 // performs a lock. | |
| 1382 if (find_lock_and_unlock_through_if(ctrl, this, lock_ops)) { | |
| 1383 // found unlock splitting to an if with locks on both branches. | |
| 1384 } | |
| 1385 } | |
| 1386 | |
| 1387 if (lock_ops.length() > 0) { | |
| 1388 // add ourselves to the list of locks to be eliminated. | |
| 1389 lock_ops.append(this); | |
| 1390 | |
| 1391 #ifndef PRODUCT | |
| 1392 if (PrintEliminateLocks) { | |
| 1393 int locks = 0; | |
| 1394 int unlocks = 0; | |
| 1395 for (int i = 0; i < lock_ops.length(); i++) { | |
| 1396 AbstractLockNode* lock = lock_ops.at(i); | |
|
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1397 if (lock->Opcode() == Op_Lock) |
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1398 locks++; |
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1399 else |
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1400 unlocks++; |
| 0 | 1401 if (Verbose) { |
| 1402 lock->dump(1); | |
| 1403 } | |
| 1404 } | |
| 1405 tty->print_cr("***Eliminated %d unlocks and %d locks", unlocks, locks); | |
| 1406 } | |
| 1407 #endif | |
| 1408 | |
| 1409 // for each of the identified locks, mark them | |
| 1410 // as eliminatable | |
| 1411 for (int i = 0; i < lock_ops.length(); i++) { | |
| 1412 AbstractLockNode* lock = lock_ops.at(i); | |
| 1413 | |
| 1414 // Mark it eliminated to update any counters | |
| 1415 lock->set_eliminated(); | |
| 1416 } | |
| 1417 } else if (result != NULL && ctrl->is_Region() && | |
| 1418 iter->_worklist.member(ctrl)) { | |
| 1419 // We weren't able to find any opportunities but the region this | |
| 1420 // lock is control dependent on hasn't been processed yet so put | |
| 1421 // this lock back on the worklist so we can check again once any | |
| 1422 // region simplification has occurred. | |
| 1423 iter->_worklist.push(this); | |
| 1424 } | |
| 1425 } | |
| 1426 } | |
| 1427 | |
| 1428 return result; | |
| 1429 } | |
| 1430 | |
| 1431 //============================================================================= | |
| 1432 uint UnlockNode::size_of() const { return sizeof(*this); } | |
| 1433 | |
| 1434 //============================================================================= | |
| 1435 Node *UnlockNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
| 1436 | |
|
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1437 // perform any generic optimizations first (returns 'this' or NULL) |
| 0 | 1438 Node * result = SafePointNode::Ideal(phase, can_reshape); |
| 1439 | |
| 1440 // Now see if we can optimize away this unlock. We don't actually | |
| 1441 // remove the unlocking here, we simply set the _eliminate flag which | |
| 1442 // prevents macro expansion from expanding the unlock. Since we don't | |
| 1443 // modify the graph, the value returned from this function is the | |
| 1444 // one computed above. | |
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1445 // Escape state is defined after Parse phase. |
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1446 if (result == NULL && can_reshape && EliminateLocks && !is_eliminated()) { |
| 0 | 1447 // |
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6672848: (Escape Analysis) improve lock elimination with EA
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1448 // If we are unlocking an unescaped object, the lock/unlock is unnecessary. |
| 0 | 1449 // |
| 1450 ConnectionGraph *cgr = Compile::current()->congraph(); | |
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6672848: (Escape Analysis) improve lock elimination with EA
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1451 PointsToNode::EscapeState es = PointsToNode::GlobalEscape; |
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6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
kvn
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1452 if (cgr != NULL) |
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6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
kvn
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65
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1453 es = cgr->escape_state(obj_node(), phase); |
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6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
kvn
parents:
65
diff
changeset
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1454 if (es != PointsToNode::UnknownEscape && es != PointsToNode::GlobalEscape) { |
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6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
kvn
parents:
65
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changeset
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1455 // Mark it eliminated to update any counters |
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6dbf1a175d6b
6672848: (Escape Analysis) improve lock elimination with EA
kvn
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65
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1456 this->set_eliminated(); |
| 0 | 1457 } |
| 1458 } | |
| 1459 return result; | |
| 1460 } |