1 /* 2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "compiler/compileLog.hpp" 27 #include "ci/bcEscapeAnalyzer.hpp" 28 #include "compiler/oopMap.hpp" 29 #include "gc/shared/barrierSet.hpp" 30 #include "gc/shared/c2/barrierSetC2.hpp" 31 #include "interpreter/interpreter.hpp" 32 #include "opto/callGenerator.hpp" 33 #include "opto/callnode.hpp" 34 #include "opto/castnode.hpp" 35 #include "opto/convertnode.hpp" 36 #include "opto/escape.hpp" 37 #include "opto/locknode.hpp" 38 #include "opto/machnode.hpp" 39 #include "opto/matcher.hpp" 40 #include "opto/parse.hpp" 41 #include "opto/regalloc.hpp" 42 #include "opto/regmask.hpp" 43 #include "opto/rootnode.hpp" 44 #include "opto/runtime.hpp" 45 46 // Portions of code courtesy of Clifford Click 47 48 // Optimization - Graph Style 49 50 //============================================================================= 51 uint StartNode::size_of() const { return sizeof(*this); } 52 uint StartNode::cmp( const Node &n ) const 53 { return _domain == ((StartNode&)n)._domain; } 54 const Type *StartNode::bottom_type() const { return _domain; } 55 const Type* StartNode::Value(PhaseGVN* phase) const { return _domain; } 56 #ifndef PRODUCT 57 void StartNode::dump_spec(outputStream *st) const { st->print(" #"); _domain->dump_on(st);} 58 void StartNode::dump_compact_spec(outputStream *st) const { /* empty */ } 59 #endif 60 61 //------------------------------Ideal------------------------------------------ 62 Node *StartNode::Ideal(PhaseGVN *phase, bool can_reshape){ 63 return remove_dead_region(phase, can_reshape) ? this : NULL; 64 } 65 66 //------------------------------calling_convention----------------------------- 67 void StartNode::calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const { 68 Matcher::calling_convention( sig_bt, parm_regs, argcnt, false ); 69 } 70 71 //------------------------------Registers-------------------------------------- 72 const RegMask &StartNode::in_RegMask(uint) const { 73 return RegMask::Empty; 74 } 75 76 //------------------------------match------------------------------------------ 77 // Construct projections for incoming parameters, and their RegMask info 78 Node *StartNode::match( const ProjNode *proj, const Matcher *match ) { 79 switch (proj->_con) { 80 case TypeFunc::Control: 81 case TypeFunc::I_O: 82 case TypeFunc::Memory: 83 return new MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj); 84 case TypeFunc::FramePtr: 85 return new MachProjNode(this,proj->_con,Matcher::c_frame_ptr_mask, Op_RegP); 86 case TypeFunc::ReturnAdr: 87 return new MachProjNode(this,proj->_con,match->_return_addr_mask,Op_RegP); 88 case TypeFunc::Parms: 89 default: { 90 uint parm_num = proj->_con - TypeFunc::Parms; 91 const Type *t = _domain->field_at(proj->_con); 92 if (t->base() == Type::Half) // 2nd half of Longs and Doubles 93 return new ConNode(Type::TOP); 94 uint ideal_reg = t->ideal_reg(); 95 RegMask &rm = match->_calling_convention_mask[parm_num]; 96 return new MachProjNode(this,proj->_con,rm,ideal_reg); 97 } 98 } 99 return NULL; 100 } 101 102 //------------------------------StartOSRNode---------------------------------- 103 // The method start node for an on stack replacement adapter 104 105 //------------------------------osr_domain----------------------------- 106 const TypeTuple *StartOSRNode::osr_domain() { 107 const Type **fields = TypeTuple::fields(2); 108 fields[TypeFunc::Parms+0] = TypeRawPtr::BOTTOM; // address of osr buffer 109 110 return TypeTuple::make(TypeFunc::Parms+1, fields); 111 } 112 113 //============================================================================= 114 const char * const ParmNode::names[TypeFunc::Parms+1] = { 115 "Control", "I_O", "Memory", "FramePtr", "ReturnAdr", "Parms" 116 }; 117 118 #ifndef PRODUCT 119 void ParmNode::dump_spec(outputStream *st) const { 120 if( _con < TypeFunc::Parms ) { 121 st->print("%s", names[_con]); 122 } else { 123 st->print("Parm%d: ",_con-TypeFunc::Parms); 124 // Verbose and WizardMode dump bottom_type for all nodes 125 if( !Verbose && !WizardMode ) bottom_type()->dump_on(st); 126 } 127 } 128 129 void ParmNode::dump_compact_spec(outputStream *st) const { 130 if (_con < TypeFunc::Parms) { 131 st->print("%s", names[_con]); 132 } else { 133 st->print("%d:", _con-TypeFunc::Parms); 134 // unconditionally dump bottom_type 135 bottom_type()->dump_on(st); 136 } 137 } 138 139 // For a ParmNode, all immediate inputs and outputs are considered relevant 140 // both in compact and standard representation. 141 void ParmNode::related(GrowableArray<Node*> *in_rel, GrowableArray<Node*> *out_rel, bool compact) const { 142 this->collect_nodes(in_rel, 1, false, false); 143 this->collect_nodes(out_rel, -1, false, false); 144 } 145 #endif 146 147 uint ParmNode::ideal_reg() const { 148 switch( _con ) { 149 case TypeFunc::Control : // fall through 150 case TypeFunc::I_O : // fall through 151 case TypeFunc::Memory : return 0; 152 case TypeFunc::FramePtr : // fall through 153 case TypeFunc::ReturnAdr: return Op_RegP; 154 default : assert( _con > TypeFunc::Parms, "" ); 155 // fall through 156 case TypeFunc::Parms : { 157 // Type of argument being passed 158 const Type *t = in(0)->as_Start()->_domain->field_at(_con); 159 return t->ideal_reg(); 160 } 161 } 162 ShouldNotReachHere(); 163 return 0; 164 } 165 166 //============================================================================= 167 ReturnNode::ReturnNode(uint edges, Node *cntrl, Node *i_o, Node *memory, Node *frameptr, Node *retadr ) : Node(edges) { 168 init_req(TypeFunc::Control,cntrl); 169 init_req(TypeFunc::I_O,i_o); 170 init_req(TypeFunc::Memory,memory); 171 init_req(TypeFunc::FramePtr,frameptr); 172 init_req(TypeFunc::ReturnAdr,retadr); 173 } 174 175 Node *ReturnNode::Ideal(PhaseGVN *phase, bool can_reshape){ 176 return remove_dead_region(phase, can_reshape) ? this : NULL; 177 } 178 179 const Type* ReturnNode::Value(PhaseGVN* phase) const { 180 return ( phase->type(in(TypeFunc::Control)) == Type::TOP) 181 ? Type::TOP 182 : Type::BOTTOM; 183 } 184 185 // Do we Match on this edge index or not? No edges on return nodes 186 uint ReturnNode::match_edge(uint idx) const { 187 return 0; 188 } 189 190 191 #ifndef PRODUCT 192 void ReturnNode::dump_req(outputStream *st) const { 193 // Dump the required inputs, enclosed in '(' and ')' 194 uint i; // Exit value of loop 195 for (i = 0; i < req(); i++) { // For all required inputs 196 if (i == TypeFunc::Parms) st->print("returns"); 197 if (in(i)) st->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx); 198 else st->print("_ "); 199 } 200 } 201 #endif 202 203 //============================================================================= 204 RethrowNode::RethrowNode( 205 Node* cntrl, 206 Node* i_o, 207 Node* memory, 208 Node* frameptr, 209 Node* ret_adr, 210 Node* exception 211 ) : Node(TypeFunc::Parms + 1) { 212 init_req(TypeFunc::Control , cntrl ); 213 init_req(TypeFunc::I_O , i_o ); 214 init_req(TypeFunc::Memory , memory ); 215 init_req(TypeFunc::FramePtr , frameptr ); 216 init_req(TypeFunc::ReturnAdr, ret_adr); 217 init_req(TypeFunc::Parms , exception); 218 } 219 220 Node *RethrowNode::Ideal(PhaseGVN *phase, bool can_reshape){ 221 return remove_dead_region(phase, can_reshape) ? this : NULL; 222 } 223 224 const Type* RethrowNode::Value(PhaseGVN* phase) const { 225 return (phase->type(in(TypeFunc::Control)) == Type::TOP) 226 ? Type::TOP 227 : Type::BOTTOM; 228 } 229 230 uint RethrowNode::match_edge(uint idx) const { 231 return 0; 232 } 233 234 #ifndef PRODUCT 235 void RethrowNode::dump_req(outputStream *st) const { 236 // Dump the required inputs, enclosed in '(' and ')' 237 uint i; // Exit value of loop 238 for (i = 0; i < req(); i++) { // For all required inputs 239 if (i == TypeFunc::Parms) st->print("exception"); 240 if (in(i)) st->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx); 241 else st->print("_ "); 242 } 243 } 244 #endif 245 246 //============================================================================= 247 // Do we Match on this edge index or not? Match only target address & method 248 uint TailCallNode::match_edge(uint idx) const { 249 return TypeFunc::Parms <= idx && idx <= TypeFunc::Parms+1; 250 } 251 252 //============================================================================= 253 // Do we Match on this edge index or not? Match only target address & oop 254 uint TailJumpNode::match_edge(uint idx) const { 255 return TypeFunc::Parms <= idx && idx <= TypeFunc::Parms+1; 256 } 257 258 //============================================================================= 259 JVMState::JVMState(ciMethod* method, JVMState* caller) : 260 _method(method) { 261 assert(method != NULL, "must be valid call site"); 262 _bci = InvocationEntryBci; 263 _reexecute = Reexecute_Undefined; 264 debug_only(_bci = -99); // random garbage value 265 debug_only(_map = (SafePointNode*)-1); 266 _caller = caller; 267 _depth = 1 + (caller == NULL ? 0 : caller->depth()); 268 _locoff = TypeFunc::Parms; 269 _stkoff = _locoff + _method->max_locals(); 270 _monoff = _stkoff + _method->max_stack(); 271 _scloff = _monoff; 272 _endoff = _monoff; 273 _sp = 0; 274 } 275 JVMState::JVMState(int stack_size) : 276 _method(NULL) { 277 _bci = InvocationEntryBci; 278 _reexecute = Reexecute_Undefined; 279 debug_only(_map = (SafePointNode*)-1); 280 _caller = NULL; 281 _depth = 1; 282 _locoff = TypeFunc::Parms; 283 _stkoff = _locoff; 284 _monoff = _stkoff + stack_size; 285 _scloff = _monoff; 286 _endoff = _monoff; 287 _sp = 0; 288 } 289 290 //--------------------------------of_depth------------------------------------- 291 JVMState* JVMState::of_depth(int d) const { 292 const JVMState* jvmp = this; 293 assert(0 < d && (uint)d <= depth(), "oob"); 294 for (int skip = depth() - d; skip > 0; skip--) { 295 jvmp = jvmp->caller(); 296 } 297 assert(jvmp->depth() == (uint)d, "found the right one"); 298 return (JVMState*)jvmp; 299 } 300 301 //-----------------------------same_calls_as----------------------------------- 302 bool JVMState::same_calls_as(const JVMState* that) const { 303 if (this == that) return true; 304 if (this->depth() != that->depth()) return false; 305 const JVMState* p = this; 306 const JVMState* q = that; 307 for (;;) { 308 if (p->_method != q->_method) return false; 309 if (p->_method == NULL) return true; // bci is irrelevant 310 if (p->_bci != q->_bci) return false; 311 if (p->_reexecute != q->_reexecute) return false; 312 p = p->caller(); 313 q = q->caller(); 314 if (p == q) return true; 315 assert(p != NULL && q != NULL, "depth check ensures we don't run off end"); 316 } 317 } 318 319 //------------------------------debug_start------------------------------------ 320 uint JVMState::debug_start() const { 321 debug_only(JVMState* jvmroot = of_depth(1)); 322 assert(jvmroot->locoff() <= this->locoff(), "youngest JVMState must be last"); 323 return of_depth(1)->locoff(); 324 } 325 326 //-------------------------------debug_end------------------------------------- 327 uint JVMState::debug_end() const { 328 debug_only(JVMState* jvmroot = of_depth(1)); 329 assert(jvmroot->endoff() <= this->endoff(), "youngest JVMState must be last"); 330 return endoff(); 331 } 332 333 //------------------------------debug_depth------------------------------------ 334 uint JVMState::debug_depth() const { 335 uint total = 0; 336 for (const JVMState* jvmp = this; jvmp != NULL; jvmp = jvmp->caller()) { 337 total += jvmp->debug_size(); 338 } 339 return total; 340 } 341 342 #ifndef PRODUCT 343 344 //------------------------------format_helper---------------------------------- 345 // Given an allocation (a Chaitin object) and a Node decide if the Node carries 346 // any defined value or not. If it does, print out the register or constant. 347 static void format_helper( PhaseRegAlloc *regalloc, outputStream* st, Node *n, const char *msg, uint i, GrowableArray<SafePointScalarObjectNode*> *scobjs ) { 348 if (n == NULL) { st->print(" NULL"); return; } 349 if (n->is_SafePointScalarObject()) { 350 // Scalar replacement. 351 SafePointScalarObjectNode* spobj = n->as_SafePointScalarObject(); 352 scobjs->append_if_missing(spobj); 353 int sco_n = scobjs->find(spobj); 354 assert(sco_n >= 0, ""); 355 st->print(" %s%d]=#ScObj" INT32_FORMAT, msg, i, sco_n); 356 return; 357 } 358 if (regalloc->node_regs_max_index() > 0 && 359 OptoReg::is_valid(regalloc->get_reg_first(n))) { // Check for undefined 360 char buf[50]; 361 regalloc->dump_register(n,buf); 362 st->print(" %s%d]=%s",msg,i,buf); 363 } else { // No register, but might be constant 364 const Type *t = n->bottom_type(); 365 switch (t->base()) { 366 case Type::Int: 367 st->print(" %s%d]=#" INT32_FORMAT,msg,i,t->is_int()->get_con()); 368 break; 369 case Type::AnyPtr: 370 assert( t == TypePtr::NULL_PTR || n->in_dump(), "" ); 371 st->print(" %s%d]=#NULL",msg,i); 372 break; 373 case Type::AryPtr: 374 case Type::InstPtr: 375 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,p2i(t->isa_oopptr()->const_oop())); 376 break; 377 case Type::KlassPtr: 378 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,p2i(t->make_ptr()->isa_klassptr()->klass())); 379 break; 380 case Type::MetadataPtr: 381 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,p2i(t->make_ptr()->isa_metadataptr()->metadata())); 382 break; 383 case Type::NarrowOop: 384 st->print(" %s%d]=#Ptr" INTPTR_FORMAT,msg,i,p2i(t->make_ptr()->isa_oopptr()->const_oop())); 385 break; 386 case Type::RawPtr: 387 st->print(" %s%d]=#Raw" INTPTR_FORMAT,msg,i,p2i(t->is_rawptr())); 388 break; 389 case Type::DoubleCon: 390 st->print(" %s%d]=#%fD",msg,i,t->is_double_constant()->_d); 391 break; 392 case Type::FloatCon: 393 st->print(" %s%d]=#%fF",msg,i,t->is_float_constant()->_f); 394 break; 395 case Type::Long: 396 st->print(" %s%d]=#" INT64_FORMAT,msg,i,(int64_t)(t->is_long()->get_con())); 397 break; 398 case Type::Half: 399 case Type::Top: 400 st->print(" %s%d]=_",msg,i); 401 break; 402 default: ShouldNotReachHere(); 403 } 404 } 405 } 406 407 //------------------------------format----------------------------------------- 408 void JVMState::format(PhaseRegAlloc *regalloc, const Node *n, outputStream* st) const { 409 st->print(" #"); 410 if (_method) { 411 _method->print_short_name(st); 412 st->print(" @ bci:%d ",_bci); 413 } else { 414 st->print_cr(" runtime stub "); 415 return; 416 } 417 if (n->is_MachSafePoint()) { 418 GrowableArray<SafePointScalarObjectNode*> scobjs; 419 MachSafePointNode *mcall = n->as_MachSafePoint(); 420 uint i; 421 // Print locals 422 for (i = 0; i < (uint)loc_size(); i++) 423 format_helper(regalloc, st, mcall->local(this, i), "L[", i, &scobjs); 424 // Print stack 425 for (i = 0; i < (uint)stk_size(); i++) { 426 if ((uint)(_stkoff + i) >= mcall->len()) 427 st->print(" oob "); 428 else 429 format_helper(regalloc, st, mcall->stack(this, i), "STK[", i, &scobjs); 430 } 431 for (i = 0; (int)i < nof_monitors(); i++) { 432 Node *box = mcall->monitor_box(this, i); 433 Node *obj = mcall->monitor_obj(this, i); 434 if (regalloc->node_regs_max_index() > 0 && 435 OptoReg::is_valid(regalloc->get_reg_first(box))) { 436 box = BoxLockNode::box_node(box); 437 format_helper(regalloc, st, box, "MON-BOX[", i, &scobjs); 438 } else { 439 OptoReg::Name box_reg = BoxLockNode::reg(box); 440 st->print(" MON-BOX%d=%s+%d", 441 i, 442 OptoReg::regname(OptoReg::c_frame_pointer), 443 regalloc->reg2offset(box_reg)); 444 } 445 const char* obj_msg = "MON-OBJ["; 446 if (EliminateLocks) { 447 if (BoxLockNode::box_node(box)->is_eliminated()) 448 obj_msg = "MON-OBJ(LOCK ELIMINATED)["; 449 } 450 format_helper(regalloc, st, obj, obj_msg, i, &scobjs); 451 } 452 453 for (i = 0; i < (uint)scobjs.length(); i++) { 454 // Scalar replaced objects. 455 st->cr(); 456 st->print(" # ScObj" INT32_FORMAT " ", i); 457 SafePointScalarObjectNode* spobj = scobjs.at(i); 458 ciKlass* cik = spobj->bottom_type()->is_oopptr()->klass(); 459 assert(cik->is_instance_klass() || 460 cik->is_array_klass(), "Not supported allocation."); 461 ciInstanceKlass *iklass = NULL; 462 if (cik->is_instance_klass()) { 463 cik->print_name_on(st); 464 iklass = cik->as_instance_klass(); 465 } else if (cik->is_type_array_klass()) { 466 cik->as_array_klass()->base_element_type()->print_name_on(st); 467 st->print("[%d]", spobj->n_fields()); 468 } else if (cik->is_obj_array_klass()) { 469 ciKlass* cie = cik->as_obj_array_klass()->base_element_klass(); 470 if (cie->is_instance_klass()) { 471 cie->print_name_on(st); 472 } else if (cie->is_type_array_klass()) { 473 cie->as_array_klass()->base_element_type()->print_name_on(st); 474 } else { 475 ShouldNotReachHere(); 476 } 477 st->print("[%d]", spobj->n_fields()); 478 int ndim = cik->as_array_klass()->dimension() - 1; 479 while (ndim-- > 0) { 480 st->print("[]"); 481 } 482 } 483 st->print("={"); 484 uint nf = spobj->n_fields(); 485 if (nf > 0) { 486 uint first_ind = spobj->first_index(mcall->jvms()); 487 Node* fld_node = mcall->in(first_ind); 488 ciField* cifield; 489 if (iklass != NULL) { 490 st->print(" ["); 491 cifield = iklass->nonstatic_field_at(0); 492 cifield->print_name_on(st); 493 format_helper(regalloc, st, fld_node, ":", 0, &scobjs); 494 } else { 495 format_helper(regalloc, st, fld_node, "[", 0, &scobjs); 496 } 497 for (uint j = 1; j < nf; j++) { 498 fld_node = mcall->in(first_ind+j); 499 if (iklass != NULL) { 500 st->print(", ["); 501 cifield = iklass->nonstatic_field_at(j); 502 cifield->print_name_on(st); 503 format_helper(regalloc, st, fld_node, ":", j, &scobjs); 504 } else { 505 format_helper(regalloc, st, fld_node, ", [", j, &scobjs); 506 } 507 } 508 } 509 st->print(" }"); 510 } 511 } 512 st->cr(); 513 if (caller() != NULL) caller()->format(regalloc, n, st); 514 } 515 516 517 void JVMState::dump_spec(outputStream *st) const { 518 if (_method != NULL) { 519 bool printed = false; 520 if (!Verbose) { 521 // The JVMS dumps make really, really long lines. 522 // Take out the most boring parts, which are the package prefixes. 523 char buf[500]; 524 stringStream namest(buf, sizeof(buf)); 525 _method->print_short_name(&namest); 526 if (namest.count() < sizeof(buf)) { 527 const char* name = namest.base(); 528 if (name[0] == ' ') ++name; 529 const char* endcn = strchr(name, ':'); // end of class name 530 if (endcn == NULL) endcn = strchr(name, '('); 531 if (endcn == NULL) endcn = name + strlen(name); 532 while (endcn > name && endcn[-1] != '.' && endcn[-1] != '/') 533 --endcn; 534 st->print(" %s", endcn); 535 printed = true; 536 } 537 } 538 if (!printed) 539 _method->print_short_name(st); 540 st->print(" @ bci:%d",_bci); 541 if(_reexecute == Reexecute_True) 542 st->print(" reexecute"); 543 } else { 544 st->print(" runtime stub"); 545 } 546 if (caller() != NULL) caller()->dump_spec(st); 547 } 548 549 550 void JVMState::dump_on(outputStream* st) const { 551 bool print_map = _map && !((uintptr_t)_map & 1) && 552 ((caller() == NULL) || (caller()->map() != _map)); 553 if (print_map) { 554 if (_map->len() > _map->req()) { // _map->has_exceptions() 555 Node* ex = _map->in(_map->req()); // _map->next_exception() 556 // skip the first one; it's already being printed 557 while (ex != NULL && ex->len() > ex->req()) { 558 ex = ex->in(ex->req()); // ex->next_exception() 559 ex->dump(1); 560 } 561 } 562 _map->dump(Verbose ? 2 : 1); 563 } 564 if (caller() != NULL) { 565 caller()->dump_on(st); 566 } 567 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=", 568 depth(), locoff(), stkoff(), argoff(), monoff(), scloff(), endoff(), monitor_depth(), sp(), bci(), should_reexecute()?"true":"false"); 569 if (_method == NULL) { 570 st->print_cr("(none)"); 571 } else { 572 _method->print_name(st); 573 st->cr(); 574 if (bci() >= 0 && bci() < _method->code_size()) { 575 st->print(" bc: "); 576 _method->print_codes_on(bci(), bci()+1, st); 577 } 578 } 579 } 580 581 // Extra way to dump a jvms from the debugger, 582 // to avoid a bug with C++ member function calls. 583 void dump_jvms(JVMState* jvms) { 584 jvms->dump(); 585 } 586 #endif 587 588 //--------------------------clone_shallow-------------------------------------- 589 JVMState* JVMState::clone_shallow(Compile* C) const { 590 JVMState* n = has_method() ? new (C) JVMState(_method, _caller) : new (C) JVMState(0); 591 n->set_bci(_bci); 592 n->_reexecute = _reexecute; 593 n->set_locoff(_locoff); 594 n->set_stkoff(_stkoff); 595 n->set_monoff(_monoff); 596 n->set_scloff(_scloff); 597 n->set_endoff(_endoff); 598 n->set_sp(_sp); 599 n->set_map(_map); 600 return n; 601 } 602 603 //---------------------------clone_deep---------------------------------------- 604 JVMState* JVMState::clone_deep(Compile* C) const { 605 JVMState* n = clone_shallow(C); 606 for (JVMState* p = n; p->_caller != NULL; p = p->_caller) { 607 p->_caller = p->_caller->clone_shallow(C); 608 } 609 assert(n->depth() == depth(), "sanity"); 610 assert(n->debug_depth() == debug_depth(), "sanity"); 611 return n; 612 } 613 614 /** 615 * Reset map for all callers 616 */ 617 void JVMState::set_map_deep(SafePointNode* map) { 618 for (JVMState* p = this; p->_caller != NULL; p = p->_caller) { 619 p->set_map(map); 620 } 621 } 622 623 // Adapt offsets in in-array after adding or removing an edge. 624 // Prerequisite is that the JVMState is used by only one node. 625 void JVMState::adapt_position(int delta) { 626 for (JVMState* jvms = this; jvms != NULL; jvms = jvms->caller()) { 627 jvms->set_locoff(jvms->locoff() + delta); 628 jvms->set_stkoff(jvms->stkoff() + delta); 629 jvms->set_monoff(jvms->monoff() + delta); 630 jvms->set_scloff(jvms->scloff() + delta); 631 jvms->set_endoff(jvms->endoff() + delta); 632 } 633 } 634 635 // Mirror the stack size calculation in the deopt code 636 // How much stack space would we need at this point in the program in 637 // case of deoptimization? 638 int JVMState::interpreter_frame_size() const { 639 const JVMState* jvms = this; 640 int size = 0; 641 int callee_parameters = 0; 642 int callee_locals = 0; 643 int extra_args = method()->max_stack() - stk_size(); 644 645 while (jvms != NULL) { 646 int locks = jvms->nof_monitors(); 647 int temps = jvms->stk_size(); 648 bool is_top_frame = (jvms == this); 649 ciMethod* method = jvms->method(); 650 651 int frame_size = BytesPerWord * Interpreter::size_activation(method->max_stack(), 652 temps + callee_parameters, 653 extra_args, 654 locks, 655 callee_parameters, 656 callee_locals, 657 is_top_frame); 658 size += frame_size; 659 660 callee_parameters = method->size_of_parameters(); 661 callee_locals = method->max_locals(); 662 extra_args = 0; 663 jvms = jvms->caller(); 664 } 665 return size + Deoptimization::last_frame_adjust(0, callee_locals) * BytesPerWord; 666 } 667 668 //============================================================================= 669 uint CallNode::cmp( const Node &n ) const 670 { return _tf == ((CallNode&)n)._tf && _jvms == ((CallNode&)n)._jvms; } 671 #ifndef PRODUCT 672 void CallNode::dump_req(outputStream *st) const { 673 // Dump the required inputs, enclosed in '(' and ')' 674 uint i; // Exit value of loop 675 for (i = 0; i < req(); i++) { // For all required inputs 676 if (i == TypeFunc::Parms) st->print("("); 677 if (in(i)) st->print("%c%d ", Compile::current()->node_arena()->contains(in(i)) ? ' ' : 'o', in(i)->_idx); 678 else st->print("_ "); 679 } 680 st->print(")"); 681 } 682 683 void CallNode::dump_spec(outputStream *st) const { 684 st->print(" "); 685 if (tf() != NULL) tf()->dump_on(st); 686 if (_cnt != COUNT_UNKNOWN) st->print(" C=%f",_cnt); 687 if (jvms() != NULL) jvms()->dump_spec(st); 688 } 689 #endif 690 691 const Type *CallNode::bottom_type() const { return tf()->range(); } 692 const Type* CallNode::Value(PhaseGVN* phase) const { 693 if (phase->type(in(0)) == Type::TOP) return Type::TOP; 694 return tf()->range(); 695 } 696 697 //------------------------------calling_convention----------------------------- 698 void CallNode::calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const { 699 // Use the standard compiler calling convention 700 Matcher::calling_convention( sig_bt, parm_regs, argcnt, true ); 701 } 702 703 704 //------------------------------match------------------------------------------ 705 // Construct projections for control, I/O, memory-fields, ..., and 706 // return result(s) along with their RegMask info 707 Node *CallNode::match( const ProjNode *proj, const Matcher *match ) { 708 switch (proj->_con) { 709 case TypeFunc::Control: 710 case TypeFunc::I_O: 711 case TypeFunc::Memory: 712 return new MachProjNode(this,proj->_con,RegMask::Empty,MachProjNode::unmatched_proj); 713 714 case TypeFunc::Parms+1: // For LONG & DOUBLE returns 715 assert(tf()->range()->field_at(TypeFunc::Parms+1) == Type::HALF, ""); 716 // 2nd half of doubles and longs 717 return new MachProjNode(this,proj->_con, RegMask::Empty, (uint)OptoReg::Bad); 718 719 case TypeFunc::Parms: { // Normal returns 720 uint ideal_reg = tf()->range()->field_at(TypeFunc::Parms)->ideal_reg(); 721 OptoRegPair regs = is_CallRuntime() 722 ? match->c_return_value(ideal_reg,true) // Calls into C runtime 723 : match-> return_value(ideal_reg,true); // Calls into compiled Java code 724 RegMask rm = RegMask(regs.first()); 725 if( OptoReg::is_valid(regs.second()) ) 726 rm.Insert( regs.second() ); 727 return new MachProjNode(this,proj->_con,rm,ideal_reg); 728 } 729 730 case TypeFunc::ReturnAdr: 731 case TypeFunc::FramePtr: 732 default: 733 ShouldNotReachHere(); 734 } 735 return NULL; 736 } 737 738 // Do we Match on this edge index or not? Match no edges 739 uint CallNode::match_edge(uint idx) const { 740 return 0; 741 } 742 743 // 744 // Determine whether the call could modify the field of the specified 745 // instance at the specified offset. 746 // 747 bool CallNode::may_modify(const TypeOopPtr *t_oop, PhaseTransform *phase) { 748 assert((t_oop != NULL), "sanity"); 749 if (is_call_to_arraycopystub() && strcmp(_name, "unsafe_arraycopy") != 0) { 750 const TypeTuple* args = _tf->domain(); 751 Node* dest = NULL; 752 // Stubs that can be called once an ArrayCopyNode is expanded have 753 // different signatures. Look for the second pointer argument, 754 // that is the destination of the copy. 755 for (uint i = TypeFunc::Parms, j = 0; i < args->cnt(); i++) { 756 if (args->field_at(i)->isa_ptr()) { 757 j++; 758 if (j == 2) { 759 dest = in(i); 760 break; 761 } 762 } 763 } 764 guarantee(dest != NULL, "Call had only one ptr in, broken IR!"); 765 if (!dest->is_top() && may_modify_arraycopy_helper(phase->type(dest)->is_oopptr(), t_oop, phase)) { 766 return true; 767 } 768 return false; 769 } 770 if (t_oop->is_known_instance()) { 771 // The instance_id is set only for scalar-replaceable allocations which 772 // are not passed as arguments according to Escape Analysis. 773 return false; 774 } 775 if (t_oop->is_ptr_to_boxed_value()) { 776 ciKlass* boxing_klass = t_oop->klass(); 777 if (is_CallStaticJava() && as_CallStaticJava()->is_boxing_method()) { 778 // Skip unrelated boxing methods. 779 Node* proj = proj_out_or_null(TypeFunc::Parms); 780 if ((proj == NULL) || (phase->type(proj)->is_instptr()->klass() != boxing_klass)) { 781 return false; 782 } 783 } 784 if (is_CallJava() && as_CallJava()->method() != NULL) { 785 ciMethod* meth = as_CallJava()->method(); 786 if (meth->is_getter()) { 787 return false; 788 } 789 // May modify (by reflection) if an boxing object is passed 790 // as argument or returned. 791 Node* proj = returns_pointer() ? proj_out_or_null(TypeFunc::Parms) : NULL; 792 if (proj != NULL) { 793 const TypeInstPtr* inst_t = phase->type(proj)->isa_instptr(); 794 if ((inst_t != NULL) && (!inst_t->klass_is_exact() || 795 (inst_t->klass() == boxing_klass))) { 796 return true; 797 } 798 } 799 const TypeTuple* d = tf()->domain(); 800 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { 801 const TypeInstPtr* inst_t = d->field_at(i)->isa_instptr(); 802 if ((inst_t != NULL) && (!inst_t->klass_is_exact() || 803 (inst_t->klass() == boxing_klass))) { 804 return true; 805 } 806 } 807 return false; 808 } 809 } 810 return true; 811 } 812 813 // Does this call have a direct reference to n other than debug information? 814 bool CallNode::has_non_debug_use(Node *n) { 815 const TypeTuple * d = tf()->domain(); 816 for (uint i = TypeFunc::Parms; i < d->cnt(); i++) { 817 Node *arg = in(i); 818 if (arg == n) { 819 return true; 820 } 821 } 822 return false; 823 } 824 825 // Returns the unique CheckCastPP of a call 826 // or 'this' if there are several CheckCastPP or unexpected uses 827 // or returns NULL if there is no one. 828 Node *CallNode::result_cast() { 829 Node *cast = NULL; 830 831 Node *p = proj_out_or_null(TypeFunc::Parms); 832 if (p == NULL) 833 return NULL; 834 835 for (DUIterator_Fast imax, i = p->fast_outs(imax); i < imax; i++) { 836 Node *use = p->fast_out(i); 837 if (use->is_CheckCastPP()) { 838 if (cast != NULL) { 839 return this; // more than 1 CheckCastPP 840 } 841 cast = use; 842 } else if (!use->is_Initialize() && 843 !use->is_AddP() && 844 use->Opcode() != Op_MemBarStoreStore) { 845 // Expected uses are restricted to a CheckCastPP, an Initialize 846 // node, a MemBarStoreStore (clone) and AddP nodes. If we 847 // encounter any other use (a Phi node can be seen in rare 848 // cases) return this to prevent incorrect optimizations. 849 return this; 850 } 851 } 852 return cast; 853 } 854 855 856 void CallNode::extract_projections(CallProjections* projs, bool separate_io_proj, bool do_asserts) { 857 projs->fallthrough_proj = NULL; 858 projs->fallthrough_catchproj = NULL; 859 projs->fallthrough_ioproj = NULL; 860 projs->catchall_ioproj = NULL; 861 projs->catchall_catchproj = NULL; 862 projs->fallthrough_memproj = NULL; 863 projs->catchall_memproj = NULL; 864 projs->resproj = NULL; 865 projs->exobj = NULL; 866 867 for (DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++) { 868 ProjNode *pn = fast_out(i)->as_Proj(); 869 if (pn->outcnt() == 0) continue; 870 switch (pn->_con) { 871 case TypeFunc::Control: 872 { 873 // For Control (fallthrough) and I_O (catch_all_index) we have CatchProj -> Catch -> Proj 874 projs->fallthrough_proj = pn; 875 DUIterator_Fast jmax, j = pn->fast_outs(jmax); 876 const Node *cn = pn->fast_out(j); 877 if (cn->is_Catch()) { 878 ProjNode *cpn = NULL; 879 for (DUIterator_Fast kmax, k = cn->fast_outs(kmax); k < kmax; k++) { 880 cpn = cn->fast_out(k)->as_Proj(); 881 assert(cpn->is_CatchProj(), "must be a CatchProjNode"); 882 if (cpn->_con == CatchProjNode::fall_through_index) 883 projs->fallthrough_catchproj = cpn; 884 else { 885 assert(cpn->_con == CatchProjNode::catch_all_index, "must be correct index."); 886 projs->catchall_catchproj = cpn; 887 } 888 } 889 } 890 break; 891 } 892 case TypeFunc::I_O: 893 if (pn->_is_io_use) 894 projs->catchall_ioproj = pn; 895 else 896 projs->fallthrough_ioproj = pn; 897 for (DUIterator j = pn->outs(); pn->has_out(j); j++) { 898 Node* e = pn->out(j); 899 if (e->Opcode() == Op_CreateEx && e->in(0)->is_CatchProj() && e->outcnt() > 0) { 900 assert(projs->exobj == NULL, "only one"); 901 projs->exobj = e; 902 } 903 } 904 break; 905 case TypeFunc::Memory: 906 if (pn->_is_io_use) 907 projs->catchall_memproj = pn; 908 else 909 projs->fallthrough_memproj = pn; 910 break; 911 case TypeFunc::Parms: 912 projs->resproj = pn; 913 break; 914 default: 915 assert(false, "unexpected projection from allocation node."); 916 } 917 } 918 919 // The resproj may not exist because the result could be ignored 920 // and the exception object may not exist if an exception handler 921 // swallows the exception but all the other must exist and be found. 922 assert(projs->fallthrough_proj != NULL, "must be found"); 923 do_asserts = do_asserts && !Compile::current()->inlining_incrementally(); 924 assert(!do_asserts || projs->fallthrough_catchproj != NULL, "must be found"); 925 assert(!do_asserts || projs->fallthrough_memproj != NULL, "must be found"); 926 assert(!do_asserts || projs->fallthrough_ioproj != NULL, "must be found"); 927 assert(!do_asserts || projs->catchall_catchproj != NULL, "must be found"); 928 if (separate_io_proj) { 929 assert(!do_asserts || projs->catchall_memproj != NULL, "must be found"); 930 assert(!do_asserts || projs->catchall_ioproj != NULL, "must be found"); 931 } 932 } 933 934 Node *CallNode::Ideal(PhaseGVN *phase, bool can_reshape) { 935 CallGenerator* cg = generator(); 936 if (can_reshape && cg != NULL && cg->is_mh_late_inline() && !cg->already_attempted()) { 937 // Check whether this MH handle call becomes a candidate for inlining 938 ciMethod* callee = cg->method(); 939 vmIntrinsics::ID iid = callee->intrinsic_id(); 940 if (iid == vmIntrinsics::_invokeBasic) { 941 if (in(TypeFunc::Parms)->Opcode() == Op_ConP) { 942 phase->C->prepend_late_inline(cg); 943 set_generator(NULL); 944 } 945 } else { 946 assert(callee->has_member_arg(), "wrong type of call?"); 947 if (in(TypeFunc::Parms + callee->arg_size() - 1)->Opcode() == Op_ConP) { 948 phase->C->prepend_late_inline(cg); 949 set_generator(NULL); 950 } 951 } 952 } 953 return SafePointNode::Ideal(phase, can_reshape); 954 } 955 956 bool CallNode::is_call_to_arraycopystub() const { 957 if (_name != NULL && strstr(_name, "arraycopy") != 0) { 958 return true; 959 } 960 return false; 961 } 962 963 //============================================================================= 964 uint CallJavaNode::size_of() const { return sizeof(*this); } 965 uint CallJavaNode::cmp( const Node &n ) const { 966 CallJavaNode &call = (CallJavaNode&)n; 967 return CallNode::cmp(call) && _method == call._method && 968 _override_symbolic_info == call._override_symbolic_info; 969 } 970 #ifndef PRODUCT 971 void CallJavaNode::dump_spec(outputStream *st) const { 972 if( _method ) _method->print_short_name(st); 973 CallNode::dump_spec(st); 974 } 975 976 void CallJavaNode::dump_compact_spec(outputStream* st) const { 977 if (_method) { 978 _method->print_short_name(st); 979 } else { 980 st->print("<?>"); 981 } 982 } 983 #endif 984 985 //============================================================================= 986 uint CallStaticJavaNode::size_of() const { return sizeof(*this); } 987 uint CallStaticJavaNode::cmp( const Node &n ) const { 988 CallStaticJavaNode &call = (CallStaticJavaNode&)n; 989 return CallJavaNode::cmp(call); 990 } 991 992 //----------------------------uncommon_trap_request---------------------------- 993 // If this is an uncommon trap, return the request code, else zero. 994 int CallStaticJavaNode::uncommon_trap_request() const { 995 if (_name != NULL && !strcmp(_name, "uncommon_trap")) { 996 return extract_uncommon_trap_request(this); 997 } 998 return 0; 999 } 1000 int CallStaticJavaNode::extract_uncommon_trap_request(const Node* call) { 1001 #ifndef PRODUCT 1002 if (!(call->req() > TypeFunc::Parms && 1003 call->in(TypeFunc::Parms) != NULL && 1004 call->in(TypeFunc::Parms)->is_Con() && 1005 call->in(TypeFunc::Parms)->bottom_type()->isa_int())) { 1006 assert(in_dump() != 0, "OK if dumping"); 1007 tty->print("[bad uncommon trap]"); 1008 return 0; 1009 } 1010 #endif 1011 return call->in(TypeFunc::Parms)->bottom_type()->is_int()->get_con(); 1012 } 1013 1014 #ifndef PRODUCT 1015 void CallStaticJavaNode::dump_spec(outputStream *st) const { 1016 st->print("# Static "); 1017 if (_name != NULL) { 1018 st->print("%s", _name); 1019 int trap_req = uncommon_trap_request(); 1020 if (trap_req != 0) { 1021 char buf[100]; 1022 st->print("(%s)", 1023 Deoptimization::format_trap_request(buf, sizeof(buf), 1024 trap_req)); 1025 } 1026 st->print(" "); 1027 } 1028 CallJavaNode::dump_spec(st); 1029 } 1030 1031 void CallStaticJavaNode::dump_compact_spec(outputStream* st) const { 1032 if (_method) { 1033 _method->print_short_name(st); 1034 } else if (_name) { 1035 st->print("%s", _name); 1036 } else { 1037 st->print("<?>"); 1038 } 1039 } 1040 #endif 1041 1042 //============================================================================= 1043 uint CallDynamicJavaNode::size_of() const { return sizeof(*this); } 1044 uint CallDynamicJavaNode::cmp( const Node &n ) const { 1045 CallDynamicJavaNode &call = (CallDynamicJavaNode&)n; 1046 return CallJavaNode::cmp(call); 1047 } 1048 #ifndef PRODUCT 1049 void CallDynamicJavaNode::dump_spec(outputStream *st) const { 1050 st->print("# Dynamic "); 1051 CallJavaNode::dump_spec(st); 1052 } 1053 #endif 1054 1055 //============================================================================= 1056 uint CallRuntimeNode::size_of() const { return sizeof(*this); } 1057 uint CallRuntimeNode::cmp( const Node &n ) const { 1058 CallRuntimeNode &call = (CallRuntimeNode&)n; 1059 return CallNode::cmp(call) && !strcmp(_name,call._name); 1060 } 1061 #ifndef PRODUCT 1062 void CallRuntimeNode::dump_spec(outputStream *st) const { 1063 st->print("# "); 1064 st->print("%s", _name); 1065 CallNode::dump_spec(st); 1066 } 1067 #endif 1068 1069 //------------------------------calling_convention----------------------------- 1070 void CallRuntimeNode::calling_convention( BasicType* sig_bt, VMRegPair *parm_regs, uint argcnt ) const { 1071 Matcher::c_calling_convention( sig_bt, parm_regs, argcnt ); 1072 } 1073 1074 //============================================================================= 1075 //------------------------------calling_convention----------------------------- 1076 1077 1078 //============================================================================= 1079 #ifndef PRODUCT 1080 void CallLeafNode::dump_spec(outputStream *st) const { 1081 st->print("# "); 1082 st->print("%s", _name); 1083 CallNode::dump_spec(st); 1084 } 1085 #endif 1086 1087 //============================================================================= 1088 1089 void SafePointNode::set_local(JVMState* jvms, uint idx, Node *c) { 1090 assert(verify_jvms(jvms), "jvms must match"); 1091 int loc = jvms->locoff() + idx; 1092 if (in(loc)->is_top() && idx > 0 && !c->is_top() ) { 1093 // If current local idx is top then local idx - 1 could 1094 // be a long/double that needs to be killed since top could 1095 // represent the 2nd half ofthe long/double. 1096 uint ideal = in(loc -1)->ideal_reg(); 1097 if (ideal == Op_RegD || ideal == Op_RegL) { 1098 // set other (low index) half to top 1099 set_req(loc - 1, in(loc)); 1100 } 1101 } 1102 set_req(loc, c); 1103 } 1104 1105 uint SafePointNode::size_of() const { return sizeof(*this); } 1106 uint SafePointNode::cmp( const Node &n ) const { 1107 return (&n == this); // Always fail except on self 1108 } 1109 1110 //-------------------------set_next_exception---------------------------------- 1111 void SafePointNode::set_next_exception(SafePointNode* n) { 1112 assert(n == NULL || n->Opcode() == Op_SafePoint, "correct value for next_exception"); 1113 if (len() == req()) { 1114 if (n != NULL) add_prec(n); 1115 } else { 1116 set_prec(req(), n); 1117 } 1118 } 1119 1120 1121 //----------------------------next_exception----------------------------------- 1122 SafePointNode* SafePointNode::next_exception() const { 1123 if (len() == req()) { 1124 return NULL; 1125 } else { 1126 Node* n = in(req()); 1127 assert(n == NULL || n->Opcode() == Op_SafePoint, "no other uses of prec edges"); 1128 return (SafePointNode*) n; 1129 } 1130 } 1131 1132 1133 //------------------------------Ideal------------------------------------------ 1134 // Skip over any collapsed Regions 1135 Node *SafePointNode::Ideal(PhaseGVN *phase, bool can_reshape) { 1136 return remove_dead_region(phase, can_reshape) ? this : NULL; 1137 } 1138 1139 //------------------------------Identity--------------------------------------- 1140 // Remove obviously duplicate safepoints 1141 Node* SafePointNode::Identity(PhaseGVN* phase) { 1142 1143 // If you have back to back safepoints, remove one 1144 if( in(TypeFunc::Control)->is_SafePoint() ) 1145 return in(TypeFunc::Control); 1146 1147 if( in(0)->is_Proj() ) { 1148 Node *n0 = in(0)->in(0); 1149 // Check if he is a call projection (except Leaf Call) 1150 if( n0->is_Catch() ) { 1151 n0 = n0->in(0)->in(0); 1152 assert( n0->is_Call(), "expect a call here" ); 1153 } 1154 if( n0->is_Call() && n0->as_Call()->guaranteed_safepoint() ) { 1155 // Don't remove a safepoint belonging to an OuterStripMinedLoopEndNode. 1156 // If the loop dies, they will be removed together. 1157 if (has_out_with(Op_OuterStripMinedLoopEnd)) { 1158 return this; 1159 } 1160 // Useless Safepoint, so remove it 1161 return in(TypeFunc::Control); 1162 } 1163 } 1164 1165 return this; 1166 } 1167 1168 //------------------------------Value------------------------------------------ 1169 const Type* SafePointNode::Value(PhaseGVN* phase) const { 1170 if( phase->type(in(0)) == Type::TOP ) return Type::TOP; 1171 if( phase->eqv( in(0), this ) ) return Type::TOP; // Dead infinite loop 1172 return Type::CONTROL; 1173 } 1174 1175 #ifndef PRODUCT 1176 void SafePointNode::dump_spec(outputStream *st) const { 1177 st->print(" SafePoint "); 1178 _replaced_nodes.dump(st); 1179 } 1180 1181 // The related nodes of a SafepointNode are all data inputs, excluding the 1182 // control boundary, as well as all outputs till level 2 (to include projection 1183 // nodes and targets). In compact mode, just include inputs till level 1 and 1184 // outputs as before. 1185 void SafePointNode::related(GrowableArray<Node*> *in_rel, GrowableArray<Node*> *out_rel, bool compact) const { 1186 if (compact) { 1187 this->collect_nodes(in_rel, 1, false, false); 1188 } else { 1189 this->collect_nodes_in_all_data(in_rel, false); 1190 } 1191 this->collect_nodes(out_rel, -2, false, false); 1192 } 1193 #endif 1194 1195 const RegMask &SafePointNode::in_RegMask(uint idx) const { 1196 if( idx < TypeFunc::Parms ) return RegMask::Empty; 1197 // Values outside the domain represent debug info 1198 return *(Compile::current()->matcher()->idealreg2debugmask[in(idx)->ideal_reg()]); 1199 } 1200 const RegMask &SafePointNode::out_RegMask() const { 1201 return RegMask::Empty; 1202 } 1203 1204 1205 void SafePointNode::grow_stack(JVMState* jvms, uint grow_by) { 1206 assert((int)grow_by > 0, "sanity"); 1207 int monoff = jvms->monoff(); 1208 int scloff = jvms->scloff(); 1209 int endoff = jvms->endoff(); 1210 assert(endoff == (int)req(), "no other states or debug info after me"); 1211 Node* top = Compile::current()->top(); 1212 for (uint i = 0; i < grow_by; i++) { 1213 ins_req(monoff, top); 1214 } 1215 jvms->set_monoff(monoff + grow_by); 1216 jvms->set_scloff(scloff + grow_by); 1217 jvms->set_endoff(endoff + grow_by); 1218 } 1219 1220 void SafePointNode::push_monitor(const FastLockNode *lock) { 1221 // Add a LockNode, which points to both the original BoxLockNode (the 1222 // stack space for the monitor) and the Object being locked. 1223 const int MonitorEdges = 2; 1224 assert(JVMState::logMonitorEdges == exact_log2(MonitorEdges), "correct MonitorEdges"); 1225 assert(req() == jvms()->endoff(), "correct sizing"); 1226 int nextmon = jvms()->scloff(); 1227 if (GenerateSynchronizationCode) { 1228 ins_req(nextmon, lock->box_node()); 1229 ins_req(nextmon+1, lock->obj_node()); 1230 } else { 1231 Node* top = Compile::current()->top(); 1232 ins_req(nextmon, top); 1233 ins_req(nextmon, top); 1234 } 1235 jvms()->set_scloff(nextmon + MonitorEdges); 1236 jvms()->set_endoff(req()); 1237 } 1238 1239 void SafePointNode::pop_monitor() { 1240 // Delete last monitor from debug info 1241 debug_only(int num_before_pop = jvms()->nof_monitors()); 1242 const int MonitorEdges = 2; 1243 assert(JVMState::logMonitorEdges == exact_log2(MonitorEdges), "correct MonitorEdges"); 1244 int scloff = jvms()->scloff(); 1245 int endoff = jvms()->endoff(); 1246 int new_scloff = scloff - MonitorEdges; 1247 int new_endoff = endoff - MonitorEdges; 1248 jvms()->set_scloff(new_scloff); 1249 jvms()->set_endoff(new_endoff); 1250 while (scloff > new_scloff) del_req_ordered(--scloff); 1251 assert(jvms()->nof_monitors() == num_before_pop-1, ""); 1252 } 1253 1254 Node *SafePointNode::peek_monitor_box() const { 1255 int mon = jvms()->nof_monitors() - 1; 1256 assert(mon >= 0, "must have a monitor"); 1257 return monitor_box(jvms(), mon); 1258 } 1259 1260 Node *SafePointNode::peek_monitor_obj() const { 1261 int mon = jvms()->nof_monitors() - 1; 1262 assert(mon >= 0, "must have a monitor"); 1263 return monitor_obj(jvms(), mon); 1264 } 1265 1266 // Do we Match on this edge index or not? Match no edges 1267 uint SafePointNode::match_edge(uint idx) const { 1268 if( !needs_polling_address_input() ) 1269 return 0; 1270 1271 return (TypeFunc::Parms == idx); 1272 } 1273 1274 //============== SafePointScalarObjectNode ============== 1275 1276 SafePointScalarObjectNode::SafePointScalarObjectNode(const TypeOopPtr* tp, 1277 #ifdef ASSERT 1278 AllocateNode* alloc, 1279 #endif 1280 uint first_index, 1281 uint n_fields) : 1282 TypeNode(tp, 1), // 1 control input -- seems required. Get from root. 1283 _first_index(first_index), 1284 _n_fields(n_fields) 1285 #ifdef ASSERT 1286 , _alloc(alloc) 1287 #endif 1288 { 1289 init_class_id(Class_SafePointScalarObject); 1290 } 1291 1292 // Do not allow value-numbering for SafePointScalarObject node. 1293 uint SafePointScalarObjectNode::hash() const { return NO_HASH; } 1294 uint SafePointScalarObjectNode::cmp( const Node &n ) const { 1295 return (&n == this); // Always fail except on self 1296 } 1297 1298 uint SafePointScalarObjectNode::ideal_reg() const { 1299 return 0; // No matching to machine instruction 1300 } 1301 1302 const RegMask &SafePointScalarObjectNode::in_RegMask(uint idx) const { 1303 return *(Compile::current()->matcher()->idealreg2debugmask[in(idx)->ideal_reg()]); 1304 } 1305 1306 const RegMask &SafePointScalarObjectNode::out_RegMask() const { 1307 return RegMask::Empty; 1308 } 1309 1310 uint SafePointScalarObjectNode::match_edge(uint idx) const { 1311 return 0; 1312 } 1313 1314 SafePointScalarObjectNode* 1315 SafePointScalarObjectNode::clone(Dict* sosn_map) const { 1316 void* cached = (*sosn_map)[(void*)this]; 1317 if (cached != NULL) { 1318 return (SafePointScalarObjectNode*)cached; 1319 } 1320 SafePointScalarObjectNode* res = (SafePointScalarObjectNode*)Node::clone(); 1321 sosn_map->Insert((void*)this, (void*)res); 1322 return res; 1323 } 1324 1325 1326 #ifndef PRODUCT 1327 void SafePointScalarObjectNode::dump_spec(outputStream *st) const { 1328 st->print(" # fields@[%d..%d]", first_index(), 1329 first_index() + n_fields() - 1); 1330 } 1331 1332 #endif 1333 1334 //============================================================================= 1335 uint AllocateNode::size_of() const { return sizeof(*this); } 1336 1337 AllocateNode::AllocateNode(Compile* C, const TypeFunc *atype, 1338 Node *ctrl, Node *mem, Node *abio, 1339 Node *size, Node *klass_node, Node *initial_test) 1340 : CallNode(atype, NULL, TypeRawPtr::BOTTOM) 1341 { 1342 init_class_id(Class_Allocate); 1343 init_flags(Flag_is_macro); 1344 _is_scalar_replaceable = false; 1345 _is_non_escaping = false; 1346 _is_allocation_MemBar_redundant = false; 1347 Node *topnode = C->top(); 1348 1349 init_req( TypeFunc::Control , ctrl ); 1350 init_req( TypeFunc::I_O , abio ); 1351 init_req( TypeFunc::Memory , mem ); 1352 init_req( TypeFunc::ReturnAdr, topnode ); 1353 init_req( TypeFunc::FramePtr , topnode ); 1354 init_req( AllocSize , size); 1355 init_req( KlassNode , klass_node); 1356 init_req( InitialTest , initial_test); 1357 init_req( ALength , topnode); 1358 C->add_macro_node(this); 1359 } 1360 1361 void AllocateNode::compute_MemBar_redundancy(ciMethod* initializer) 1362 { 1363 assert(initializer != NULL && 1364 initializer->is_initializer() && 1365 !initializer->is_static(), 1366 "unexpected initializer method"); 1367 BCEscapeAnalyzer* analyzer = initializer->get_bcea(); 1368 if (analyzer == NULL) { 1369 return; 1370 } 1371 1372 // Allocation node is first parameter in its initializer 1373 if (analyzer->is_arg_stack(0) || analyzer->is_arg_local(0)) { 1374 _is_allocation_MemBar_redundant = true; 1375 } 1376 } 1377 1378 //============================================================================= 1379 Node* AllocateArrayNode::Ideal(PhaseGVN *phase, bool can_reshape) { 1380 if (remove_dead_region(phase, can_reshape)) return this; 1381 // Don't bother trying to transform a dead node 1382 if (in(0) && in(0)->is_top()) return NULL; 1383 1384 const Type* type = phase->type(Ideal_length()); 1385 if (type->isa_int() && type->is_int()->_hi < 0) { 1386 if (can_reshape) { 1387 PhaseIterGVN *igvn = phase->is_IterGVN(); 1388 // Unreachable fall through path (negative array length), 1389 // the allocation can only throw so disconnect it. 1390 Node* proj = proj_out_or_null(TypeFunc::Control); 1391 Node* catchproj = NULL; 1392 if (proj != NULL) { 1393 for (DUIterator_Fast imax, i = proj->fast_outs(imax); i < imax; i++) { 1394 Node *cn = proj->fast_out(i); 1395 if (cn->is_Catch()) { 1396 catchproj = cn->as_Multi()->proj_out_or_null(CatchProjNode::fall_through_index); 1397 break; 1398 } 1399 } 1400 } 1401 if (catchproj != NULL && catchproj->outcnt() > 0 && 1402 (catchproj->outcnt() > 1 || 1403 catchproj->unique_out()->Opcode() != Op_Halt)) { 1404 assert(catchproj->is_CatchProj(), "must be a CatchProjNode"); 1405 Node* nproj = catchproj->clone(); 1406 igvn->register_new_node_with_optimizer(nproj); 1407 1408 Node *frame = new ParmNode( phase->C->start(), TypeFunc::FramePtr ); 1409 frame = phase->transform(frame); 1410 // Halt & Catch Fire 1411 Node *halt = new HaltNode( nproj, frame ); 1412 phase->C->root()->add_req(halt); 1413 phase->transform(halt); 1414 1415 igvn->replace_node(catchproj, phase->C->top()); 1416 return this; 1417 } 1418 } else { 1419 // Can't correct it during regular GVN so register for IGVN 1420 phase->C->record_for_igvn(this); 1421 } 1422 } 1423 return NULL; 1424 } 1425 1426 // Retrieve the length from the AllocateArrayNode. Narrow the type with a 1427 // CastII, if appropriate. If we are not allowed to create new nodes, and 1428 // a CastII is appropriate, return NULL. 1429 Node *AllocateArrayNode::make_ideal_length(const TypeOopPtr* oop_type, PhaseTransform *phase, bool allow_new_nodes) { 1430 Node *length = in(AllocateNode::ALength); 1431 assert(length != NULL, "length is not null"); 1432 1433 const TypeInt* length_type = phase->find_int_type(length); 1434 const TypeAryPtr* ary_type = oop_type->isa_aryptr(); 1435 1436 if (ary_type != NULL && length_type != NULL) { 1437 const TypeInt* narrow_length_type = ary_type->narrow_size_type(length_type); 1438 if (narrow_length_type != length_type) { 1439 // Assert one of: 1440 // - the narrow_length is 0 1441 // - the narrow_length is not wider than length 1442 assert(narrow_length_type == TypeInt::ZERO || 1443 length_type->is_con() && narrow_length_type->is_con() && 1444 (narrow_length_type->_hi <= length_type->_lo) || 1445 (narrow_length_type->_hi <= length_type->_hi && 1446 narrow_length_type->_lo >= length_type->_lo), 1447 "narrow type must be narrower than length type"); 1448 1449 // Return NULL if new nodes are not allowed 1450 if (!allow_new_nodes) return NULL; 1451 // Create a cast which is control dependent on the initialization to 1452 // propagate the fact that the array length must be positive. 1453 InitializeNode* init = initialization(); 1454 assert(init != NULL, "initialization not found"); 1455 length = new CastIINode(length, narrow_length_type); 1456 length->set_req(0, init->proj_out_or_null(0)); 1457 } 1458 } 1459 1460 return length; 1461 } 1462 1463 //============================================================================= 1464 uint LockNode::size_of() const { return sizeof(*this); } 1465 1466 // Redundant lock elimination 1467 // 1468 // There are various patterns of locking where we release and 1469 // immediately reacquire a lock in a piece of code where no operations 1470 // occur in between that would be observable. In those cases we can 1471 // skip releasing and reacquiring the lock without violating any 1472 // fairness requirements. Doing this around a loop could cause a lock 1473 // to be held for a very long time so we concentrate on non-looping 1474 // control flow. We also require that the operations are fully 1475 // redundant meaning that we don't introduce new lock operations on 1476 // some paths so to be able to eliminate it on others ala PRE. This 1477 // would probably require some more extensive graph manipulation to 1478 // guarantee that the memory edges were all handled correctly. 1479 // 1480 // Assuming p is a simple predicate which can't trap in any way and s 1481 // is a synchronized method consider this code: 1482 // 1483 // s(); 1484 // if (p) 1485 // s(); 1486 // else 1487 // s(); 1488 // s(); 1489 // 1490 // 1. The unlocks of the first call to s can be eliminated if the 1491 // locks inside the then and else branches are eliminated. 1492 // 1493 // 2. The unlocks of the then and else branches can be eliminated if 1494 // the lock of the final call to s is eliminated. 1495 // 1496 // Either of these cases subsumes the simple case of sequential control flow 1497 // 1498 // Addtionally we can eliminate versions without the else case: 1499 // 1500 // s(); 1501 // if (p) 1502 // s(); 1503 // s(); 1504 // 1505 // 3. In this case we eliminate the unlock of the first s, the lock 1506 // and unlock in the then case and the lock in the final s. 1507 // 1508 // Note also that in all these cases the then/else pieces don't have 1509 // to be trivial as long as they begin and end with synchronization 1510 // operations. 1511 // 1512 // s(); 1513 // if (p) 1514 // s(); 1515 // f(); 1516 // s(); 1517 // s(); 1518 // 1519 // The code will work properly for this case, leaving in the unlock 1520 // before the call to f and the relock after it. 1521 // 1522 // A potentially interesting case which isn't handled here is when the 1523 // locking is partially redundant. 1524 // 1525 // s(); 1526 // if (p) 1527 // s(); 1528 // 1529 // This could be eliminated putting unlocking on the else case and 1530 // eliminating the first unlock and the lock in the then side. 1531 // Alternatively the unlock could be moved out of the then side so it 1532 // was after the merge and the first unlock and second lock 1533 // eliminated. This might require less manipulation of the memory 1534 // state to get correct. 1535 // 1536 // Additionally we might allow work between a unlock and lock before 1537 // giving up eliminating the locks. The current code disallows any 1538 // conditional control flow between these operations. A formulation 1539 // similar to partial redundancy elimination computing the 1540 // availability of unlocking and the anticipatability of locking at a 1541 // program point would allow detection of fully redundant locking with 1542 // some amount of work in between. I'm not sure how often I really 1543 // think that would occur though. Most of the cases I've seen 1544 // indicate it's likely non-trivial work would occur in between. 1545 // There may be other more complicated constructs where we could 1546 // eliminate locking but I haven't seen any others appear as hot or 1547 // interesting. 1548 // 1549 // Locking and unlocking have a canonical form in ideal that looks 1550 // roughly like this: 1551 // 1552 // <obj> 1553 // | \\------+ 1554 // | \ \ 1555 // | BoxLock \ 1556 // | | | \ 1557 // | | \ \ 1558 // | | FastLock 1559 // | | / 1560 // | | / 1561 // | | | 1562 // 1563 // Lock 1564 // | 1565 // Proj #0 1566 // | 1567 // MembarAcquire 1568 // | 1569 // Proj #0 1570 // 1571 // MembarRelease 1572 // | 1573 // Proj #0 1574 // | 1575 // Unlock 1576 // | 1577 // Proj #0 1578 // 1579 // 1580 // This code proceeds by processing Lock nodes during PhaseIterGVN 1581 // and searching back through its control for the proper code 1582 // patterns. Once it finds a set of lock and unlock operations to 1583 // eliminate they are marked as eliminatable which causes the 1584 // expansion of the Lock and Unlock macro nodes to make the operation a NOP 1585 // 1586 //============================================================================= 1587 1588 // 1589 // Utility function to skip over uninteresting control nodes. Nodes skipped are: 1590 // - copy regions. (These may not have been optimized away yet.) 1591 // - eliminated locking nodes 1592 // 1593 static Node *next_control(Node *ctrl) { 1594 if (ctrl == NULL) 1595 return NULL; 1596 while (1) { 1597 if (ctrl->is_Region()) { 1598 RegionNode *r = ctrl->as_Region(); 1599 Node *n = r->is_copy(); 1600 if (n == NULL) 1601 break; // hit a region, return it 1602 else 1603 ctrl = n; 1604 } else if (ctrl->is_Proj()) { 1605 Node *in0 = ctrl->in(0); 1606 if (in0->is_AbstractLock() && in0->as_AbstractLock()->is_eliminated()) { 1607 ctrl = in0->in(0); 1608 } else { 1609 break; 1610 } 1611 } else { 1612 break; // found an interesting control 1613 } 1614 } 1615 return ctrl; 1616 } 1617 // 1618 // Given a control, see if it's the control projection of an Unlock which 1619 // operating on the same object as lock. 1620 // 1621 bool AbstractLockNode::find_matching_unlock(const Node* ctrl, LockNode* lock, 1622 GrowableArray<AbstractLockNode*> &lock_ops) { 1623 ProjNode *ctrl_proj = (ctrl->is_Proj()) ? ctrl->as_Proj() : NULL; 1624 if (ctrl_proj != NULL && ctrl_proj->_con == TypeFunc::Control) { 1625 Node *n = ctrl_proj->in(0); 1626 if (n != NULL && n->is_Unlock()) { 1627 UnlockNode *unlock = n->as_Unlock(); 1628 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2(); 1629 Node* lock_obj = bs->step_over_gc_barrier(lock->obj_node()); 1630 Node* unlock_obj = bs->step_over_gc_barrier(unlock->obj_node()); 1631 if (lock_obj->eqv_uncast(unlock_obj) && 1632 BoxLockNode::same_slot(lock->box_node(), unlock->box_node()) && 1633 !unlock->is_eliminated()) { 1634 lock_ops.append(unlock); 1635 return true; 1636 } 1637 } 1638 } 1639 return false; 1640 } 1641 1642 // 1643 // Find the lock matching an unlock. Returns null if a safepoint 1644 // or complicated control is encountered first. 1645 LockNode *AbstractLockNode::find_matching_lock(UnlockNode* unlock) { 1646 LockNode *lock_result = NULL; 1647 // find the matching lock, or an intervening safepoint 1648 Node *ctrl = next_control(unlock->in(0)); 1649 while (1) { 1650 assert(ctrl != NULL, "invalid control graph"); 1651 assert(!ctrl->is_Start(), "missing lock for unlock"); 1652 if (ctrl->is_top()) break; // dead control path 1653 if (ctrl->is_Proj()) ctrl = ctrl->in(0); 1654 if (ctrl->is_SafePoint()) { 1655 break; // found a safepoint (may be the lock we are searching for) 1656 } else if (ctrl->is_Region()) { 1657 // Check for a simple diamond pattern. Punt on anything more complicated 1658 if (ctrl->req() == 3 && ctrl->in(1) != NULL && ctrl->in(2) != NULL) { 1659 Node *in1 = next_control(ctrl->in(1)); 1660 Node *in2 = next_control(ctrl->in(2)); 1661 if (((in1->is_IfTrue() && in2->is_IfFalse()) || 1662 (in2->is_IfTrue() && in1->is_IfFalse())) && (in1->in(0) == in2->in(0))) { 1663 ctrl = next_control(in1->in(0)->in(0)); 1664 } else { 1665 break; 1666 } 1667 } else { 1668 break; 1669 } 1670 } else { 1671 ctrl = next_control(ctrl->in(0)); // keep searching 1672 } 1673 } 1674 if (ctrl->is_Lock()) { 1675 LockNode *lock = ctrl->as_Lock(); 1676 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2(); 1677 Node* lock_obj = bs->step_over_gc_barrier(lock->obj_node()); 1678 Node* unlock_obj = bs->step_over_gc_barrier(unlock->obj_node()); 1679 if (lock_obj->eqv_uncast(unlock_obj) && 1680 BoxLockNode::same_slot(lock->box_node(), unlock->box_node())) { 1681 lock_result = lock; 1682 } 1683 } 1684 return lock_result; 1685 } 1686 1687 // This code corresponds to case 3 above. 1688 1689 bool AbstractLockNode::find_lock_and_unlock_through_if(Node* node, LockNode* lock, 1690 GrowableArray<AbstractLockNode*> &lock_ops) { 1691 Node* if_node = node->in(0); 1692 bool if_true = node->is_IfTrue(); 1693 1694 if (if_node->is_If() && if_node->outcnt() == 2 && (if_true || node->is_IfFalse())) { 1695 Node *lock_ctrl = next_control(if_node->in(0)); 1696 if (find_matching_unlock(lock_ctrl, lock, lock_ops)) { 1697 Node* lock1_node = NULL; 1698 ProjNode* proj = if_node->as_If()->proj_out(!if_true); 1699 if (if_true) { 1700 if (proj->is_IfFalse() && proj->outcnt() == 1) { 1701 lock1_node = proj->unique_out(); 1702 } 1703 } else { 1704 if (proj->is_IfTrue() && proj->outcnt() == 1) { 1705 lock1_node = proj->unique_out(); 1706 } 1707 } 1708 if (lock1_node != NULL && lock1_node->is_Lock()) { 1709 LockNode *lock1 = lock1_node->as_Lock(); 1710 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2(); 1711 Node* lock_obj = bs->step_over_gc_barrier(lock->obj_node()); 1712 Node* lock1_obj = bs->step_over_gc_barrier(lock1->obj_node()); 1713 if (lock_obj->eqv_uncast(lock1_obj) && 1714 BoxLockNode::same_slot(lock->box_node(), lock1->box_node()) && 1715 !lock1->is_eliminated()) { 1716 lock_ops.append(lock1); 1717 return true; 1718 } 1719 } 1720 } 1721 } 1722 1723 lock_ops.trunc_to(0); 1724 return false; 1725 } 1726 1727 bool AbstractLockNode::find_unlocks_for_region(const RegionNode* region, LockNode* lock, 1728 GrowableArray<AbstractLockNode*> &lock_ops) { 1729 // check each control merging at this point for a matching unlock. 1730 // in(0) should be self edge so skip it. 1731 for (int i = 1; i < (int)region->req(); i++) { 1732 Node *in_node = next_control(region->in(i)); 1733 if (in_node != NULL) { 1734 if (find_matching_unlock(in_node, lock, lock_ops)) { 1735 // found a match so keep on checking. 1736 continue; 1737 } else if (find_lock_and_unlock_through_if(in_node, lock, lock_ops)) { 1738 continue; 1739 } 1740 1741 // If we fall through to here then it was some kind of node we 1742 // don't understand or there wasn't a matching unlock, so give 1743 // up trying to merge locks. 1744 lock_ops.trunc_to(0); 1745 return false; 1746 } 1747 } 1748 return true; 1749 1750 } 1751 1752 #ifndef PRODUCT 1753 // 1754 // Create a counter which counts the number of times this lock is acquired 1755 // 1756 void AbstractLockNode::create_lock_counter(JVMState* state) { 1757 _counter = OptoRuntime::new_named_counter(state, NamedCounter::LockCounter); 1758 } 1759 1760 void AbstractLockNode::set_eliminated_lock_counter() { 1761 if (_counter) { 1762 // Update the counter to indicate that this lock was eliminated. 1763 // The counter update code will stay around even though the 1764 // optimizer will eliminate the lock operation itself. 1765 _counter->set_tag(NamedCounter::EliminatedLockCounter); 1766 } 1767 } 1768 1769 const char* AbstractLockNode::_kind_names[] = {"Regular", "NonEscObj", "Coarsened", "Nested"}; 1770 1771 void AbstractLockNode::dump_spec(outputStream* st) const { 1772 st->print("%s ", _kind_names[_kind]); 1773 CallNode::dump_spec(st); 1774 } 1775 1776 void AbstractLockNode::dump_compact_spec(outputStream* st) const { 1777 st->print("%s", _kind_names[_kind]); 1778 } 1779 1780 // The related set of lock nodes includes the control boundary. 1781 void AbstractLockNode::related(GrowableArray<Node*> *in_rel, GrowableArray<Node*> *out_rel, bool compact) const { 1782 if (compact) { 1783 this->collect_nodes(in_rel, 1, false, false); 1784 } else { 1785 this->collect_nodes_in_all_data(in_rel, true); 1786 } 1787 this->collect_nodes(out_rel, -2, false, false); 1788 } 1789 #endif 1790 1791 //============================================================================= 1792 Node *LockNode::Ideal(PhaseGVN *phase, bool can_reshape) { 1793 1794 // perform any generic optimizations first (returns 'this' or NULL) 1795 Node *result = SafePointNode::Ideal(phase, can_reshape); 1796 if (result != NULL) return result; 1797 // Don't bother trying to transform a dead node 1798 if (in(0) && in(0)->is_top()) return NULL; 1799 1800 // Now see if we can optimize away this lock. We don't actually 1801 // remove the locking here, we simply set the _eliminate flag which 1802 // prevents macro expansion from expanding the lock. Since we don't 1803 // modify the graph, the value returned from this function is the 1804 // one computed above. 1805 if (can_reshape && EliminateLocks && !is_non_esc_obj()) { 1806 // 1807 // If we are locking an unescaped object, the lock/unlock is unnecessary 1808 // 1809 ConnectionGraph *cgr = phase->C->congraph(); 1810 if (cgr != NULL && cgr->not_global_escape(obj_node())) { 1811 assert(!is_eliminated() || is_coarsened(), "sanity"); 1812 // The lock could be marked eliminated by lock coarsening 1813 // code during first IGVN before EA. Replace coarsened flag 1814 // to eliminate all associated locks/unlocks. 1815 #ifdef ASSERT 1816 this->log_lock_optimization(phase->C,"eliminate_lock_set_non_esc1"); 1817 #endif 1818 this->set_non_esc_obj(); 1819 return result; 1820 } 1821 1822 // 1823 // Try lock coarsening 1824 // 1825 PhaseIterGVN* iter = phase->is_IterGVN(); 1826 if (iter != NULL && !is_eliminated()) { 1827 1828 GrowableArray<AbstractLockNode*> lock_ops; 1829 1830 Node *ctrl = next_control(in(0)); 1831 1832 // now search back for a matching Unlock 1833 if (find_matching_unlock(ctrl, this, lock_ops)) { 1834 // found an unlock directly preceding this lock. This is the 1835 // case of single unlock directly control dependent on a 1836 // single lock which is the trivial version of case 1 or 2. 1837 } else if (ctrl->is_Region() ) { 1838 if (find_unlocks_for_region(ctrl->as_Region(), this, lock_ops)) { 1839 // found lock preceded by multiple unlocks along all paths 1840 // joining at this point which is case 3 in description above. 1841 } 1842 } else { 1843 // see if this lock comes from either half of an if and the 1844 // predecessors merges unlocks and the other half of the if 1845 // performs a lock. 1846 if (find_lock_and_unlock_through_if(ctrl, this, lock_ops)) { 1847 // found unlock splitting to an if with locks on both branches. 1848 } 1849 } 1850 1851 if (lock_ops.length() > 0) { 1852 // add ourselves to the list of locks to be eliminated. 1853 lock_ops.append(this); 1854 1855 #ifndef PRODUCT 1856 if (PrintEliminateLocks) { 1857 int locks = 0; 1858 int unlocks = 0; 1859 for (int i = 0; i < lock_ops.length(); i++) { 1860 AbstractLockNode* lock = lock_ops.at(i); 1861 if (lock->Opcode() == Op_Lock) 1862 locks++; 1863 else 1864 unlocks++; 1865 if (Verbose) { 1866 lock->dump(1); 1867 } 1868 } 1869 tty->print_cr("***Eliminated %d unlocks and %d locks", unlocks, locks); 1870 } 1871 #endif 1872 1873 // for each of the identified locks, mark them 1874 // as eliminatable 1875 for (int i = 0; i < lock_ops.length(); i++) { 1876 AbstractLockNode* lock = lock_ops.at(i); 1877 1878 // Mark it eliminated by coarsening and update any counters 1879 #ifdef ASSERT 1880 lock->log_lock_optimization(phase->C, "eliminate_lock_set_coarsened"); 1881 #endif 1882 lock->set_coarsened(); 1883 } 1884 } else if (ctrl->is_Region() && 1885 iter->_worklist.member(ctrl)) { 1886 // We weren't able to find any opportunities but the region this 1887 // lock is control dependent on hasn't been processed yet so put 1888 // this lock back on the worklist so we can check again once any 1889 // region simplification has occurred. 1890 iter->_worklist.push(this); 1891 } 1892 } 1893 } 1894 1895 return result; 1896 } 1897 1898 //============================================================================= 1899 bool LockNode::is_nested_lock_region() { 1900 return is_nested_lock_region(NULL); 1901 } 1902 1903 // p is used for access to compilation log; no logging if NULL 1904 bool LockNode::is_nested_lock_region(Compile * c) { 1905 BoxLockNode* box = box_node()->as_BoxLock(); 1906 int stk_slot = box->stack_slot(); 1907 if (stk_slot <= 0) { 1908 #ifdef ASSERT 1909 this->log_lock_optimization(c, "eliminate_lock_INLR_1"); 1910 #endif 1911 return false; // External lock or it is not Box (Phi node). 1912 } 1913 1914 // Ignore complex cases: merged locks or multiple locks. 1915 Node* obj = obj_node(); 1916 LockNode* unique_lock = NULL; 1917 if (!box->is_simple_lock_region(&unique_lock, obj)) { 1918 #ifdef ASSERT 1919 this->log_lock_optimization(c, "eliminate_lock_INLR_2a"); 1920 #endif 1921 return false; 1922 } 1923 if (unique_lock != this) { 1924 #ifdef ASSERT 1925 this->log_lock_optimization(c, "eliminate_lock_INLR_2b"); 1926 #endif 1927 return false; 1928 } 1929 1930 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2(); 1931 obj = bs->step_over_gc_barrier(obj); 1932 // Look for external lock for the same object. 1933 SafePointNode* sfn = this->as_SafePoint(); 1934 JVMState* youngest_jvms = sfn->jvms(); 1935 int max_depth = youngest_jvms->depth(); 1936 for (int depth = 1; depth <= max_depth; depth++) { 1937 JVMState* jvms = youngest_jvms->of_depth(depth); 1938 int num_mon = jvms->nof_monitors(); 1939 // Loop over monitors 1940 for (int idx = 0; idx < num_mon; idx++) { 1941 Node* obj_node = sfn->monitor_obj(jvms, idx); 1942 obj_node = bs->step_over_gc_barrier(obj_node); 1943 BoxLockNode* box_node = sfn->monitor_box(jvms, idx)->as_BoxLock(); 1944 if ((box_node->stack_slot() < stk_slot) && obj_node->eqv_uncast(obj)) { 1945 return true; 1946 } 1947 } 1948 } 1949 #ifdef ASSERT 1950 this->log_lock_optimization(c, "eliminate_lock_INLR_3"); 1951 #endif 1952 return false; 1953 } 1954 1955 //============================================================================= 1956 uint UnlockNode::size_of() const { return sizeof(*this); } 1957 1958 //============================================================================= 1959 Node *UnlockNode::Ideal(PhaseGVN *phase, bool can_reshape) { 1960 1961 // perform any generic optimizations first (returns 'this' or NULL) 1962 Node *result = SafePointNode::Ideal(phase, can_reshape); 1963 if (result != NULL) return result; 1964 // Don't bother trying to transform a dead node 1965 if (in(0) && in(0)->is_top()) return NULL; 1966 1967 // Now see if we can optimize away this unlock. We don't actually 1968 // remove the unlocking here, we simply set the _eliminate flag which 1969 // prevents macro expansion from expanding the unlock. Since we don't 1970 // modify the graph, the value returned from this function is the 1971 // one computed above. 1972 // Escape state is defined after Parse phase. 1973 if (can_reshape && EliminateLocks && !is_non_esc_obj()) { 1974 // 1975 // If we are unlocking an unescaped object, the lock/unlock is unnecessary. 1976 // 1977 ConnectionGraph *cgr = phase->C->congraph(); 1978 if (cgr != NULL && cgr->not_global_escape(obj_node())) { 1979 assert(!is_eliminated() || is_coarsened(), "sanity"); 1980 // The lock could be marked eliminated by lock coarsening 1981 // code during first IGVN before EA. Replace coarsened flag 1982 // to eliminate all associated locks/unlocks. 1983 #ifdef ASSERT 1984 this->log_lock_optimization(phase->C, "eliminate_lock_set_non_esc2"); 1985 #endif 1986 this->set_non_esc_obj(); 1987 } 1988 } 1989 return result; 1990 } 1991 1992 const char * AbstractLockNode::kind_as_string() const { 1993 return is_coarsened() ? "coarsened" : 1994 is_nested() ? "nested" : 1995 is_non_esc_obj() ? "non_escaping" : 1996 "?"; 1997 } 1998 1999 void AbstractLockNode::log_lock_optimization(Compile *C, const char * tag) const { 2000 if (C == NULL) { 2001 return; 2002 } 2003 CompileLog* log = C->log(); 2004 if (log != NULL) { 2005 log->begin_head("%s lock='%d' compile_id='%d' class_id='%s' kind='%s'", 2006 tag, is_Lock(), C->compile_id(), 2007 is_Unlock() ? "unlock" : is_Lock() ? "lock" : "?", 2008 kind_as_string()); 2009 log->stamp(); 2010 log->end_head(); 2011 JVMState* p = is_Unlock() ? (as_Unlock()->dbg_jvms()) : jvms(); 2012 while (p != NULL) { 2013 log->elem("jvms bci='%d' method='%d'", p->bci(), log->identify(p->method())); 2014 p = p->caller(); 2015 } 2016 log->tail(tag); 2017 } 2018 } 2019 2020 bool CallNode::may_modify_arraycopy_helper(const TypeOopPtr* dest_t, const TypeOopPtr *t_oop, PhaseTransform *phase) { 2021 if (dest_t->is_known_instance() && t_oop->is_known_instance()) { 2022 return dest_t->instance_id() == t_oop->instance_id(); 2023 } 2024 2025 if (dest_t->isa_instptr() && !dest_t->klass()->equals(phase->C->env()->Object_klass())) { 2026 // clone 2027 if (t_oop->isa_aryptr()) { 2028 return false; 2029 } 2030 if (!t_oop->isa_instptr()) { 2031 return true; 2032 } 2033 if (dest_t->klass()->is_subtype_of(t_oop->klass()) || t_oop->klass()->is_subtype_of(dest_t->klass())) { 2034 return true; 2035 } 2036 // unrelated 2037 return false; 2038 } 2039 2040 if (dest_t->isa_aryptr()) { 2041 // arraycopy or array clone 2042 if (t_oop->isa_instptr()) { 2043 return false; 2044 } 2045 if (!t_oop->isa_aryptr()) { 2046 return true; 2047 } 2048 2049 const Type* elem = dest_t->is_aryptr()->elem(); 2050 if (elem == Type::BOTTOM) { 2051 // An array but we don't know what elements are 2052 return true; 2053 } 2054 2055 dest_t = dest_t->add_offset(Type::OffsetBot)->is_oopptr(); 2056 uint dest_alias = phase->C->get_alias_index(dest_t); 2057 uint t_oop_alias = phase->C->get_alias_index(t_oop); 2058 2059 return dest_alias == t_oop_alias; 2060 } 2061 2062 return true; 2063 } 2064