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