src/v8/src/arm/lithium-arm.cc

   1 // Copyright 2012 the V8 project authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "src/v8.h"
   6
   7 #include "src/arm/lithium-codegen-arm.h"
   8 #include "src/hydrogen-osr.h"
   9 #include "src/lithium-inl.h"
  10
  11 namespace v8 {
  12 namespace internal {
  13
  14 #define DEFINE_COMPILE(type)                            \
  15   void L##type::CompileToNative(LCodeGen* generator) {  \
  16     generator->Do##type(this);                          \
  17   }
  18 LITHIUM_CONCRETE_INSTRUCTION_LIST(DEFINE_COMPILE)
  19 #undef DEFINE_COMPILE
  20
  21 #ifdef DEBUG
  22 void LInstruction::VerifyCall() {
  23   // Call instructions can use only fixed registers as temporaries and
  24   // outputs because all registers are blocked by the calling convention.
  25   // Inputs operands must use a fixed register or use-at-start policy or
  26   // a non-register policy.
  27   DCHECK(Output() == NULL ||
  28          LUnallocated::cast(Output())->HasFixedPolicy() ||
  29          !LUnallocated::cast(Output())->HasRegisterPolicy());
  30   for (UseIterator it(this); !it.Done(); it.Advance()) {
  31     LUnallocated* operand = LUnallocated::cast(it.Current());
  32     DCHECK(operand->HasFixedPolicy() ||
  33            operand->IsUsedAtStart());
  34   }
  35   for (TempIterator it(this); !it.Done(); it.Advance()) {
  36     LUnallocated* operand = LUnallocated::cast(it.Current());
  37     DCHECK(operand->HasFixedPolicy() ||!operand->HasRegisterPolicy());
  38   }
  39 }
  40 #endif
  41
  42
  43 void LInstruction::PrintTo(StringStream* stream) {
  44   stream->Add("%s ", this->Mnemonic());
  45
  46   PrintOutputOperandTo(stream);
  47
  48   PrintDataTo(stream);
  49
  50   if (HasEnvironment()) {
  51     stream->Add(" ");
  52     environment()->PrintTo(stream);
  53   }
  54
  55   if (HasPointerMap()) {
  56     stream->Add(" ");
  57     pointer_map()->PrintTo(stream);
  58   }
  59 }
  60
  61
  62 void LInstruction::PrintDataTo(StringStream* stream) {
  63   stream->Add("= ");
  64   for (int i = 0; i < InputCount(); i++) {
  65     if (i > 0) stream->Add(" ");
  66     if (InputAt(i) == NULL) {
  67       stream->Add("NULL");
  68     } else {
  69       InputAt(i)->PrintTo(stream);
  70     }
  71   }
  72 }
  73
  74
  75 void LInstruction::PrintOutputOperandTo(StringStream* stream) {
  76   if (HasResult()) result()->PrintTo(stream);
  77 }
  78
  79
  80 void LLabel::PrintDataTo(StringStream* stream) {
  81   LGap::PrintDataTo(stream);
  82   LLabel* rep = replacement();
  83   if (rep != NULL) {
  84     stream->Add(" Dead block replaced with B%d", rep->block_id());
  85   }
  86 }
  87
  88
  89 bool LGap::IsRedundant() const {
  90   for (int i = 0; i < 4; i++) {
  91     if (parallel_moves_[i] != NULL && !parallel_moves_[i]->IsRedundant()) {
  92       return false;
  93     }
  94   }
  95
  96   return true;
  97 }
  98
  99
 100 void LGap::PrintDataTo(StringStream* stream) {
 101   for (int i = 0; i < 4; i++) {
 102     stream->Add("(");
 103     if (parallel_moves_[i] != NULL) {
 104       parallel_moves_[i]->PrintDataTo(stream);
 105     }
 106     stream->Add(") ");
 107   }
 108 }
 109
 110
 111 const char* LArithmeticD::Mnemonic() const {
 112   switch (op()) {
 113     case Token::ADD: return "add-d";
 114     case Token::SUB: return "sub-d";
 115     case Token::MUL: return "mul-d";
 116     case Token::DIV: return "div-d";
 117     case Token::MOD: return "mod-d";
 118     default:
 119       UNREACHABLE();
 120       return NULL;
 121   }
 122 }
 123
 124
 125 const char* LArithmeticT::Mnemonic() const {
 126   switch (op()) {
 127     case Token::ADD: return "add-t";
 128     case Token::SUB: return "sub-t";
 129     case Token::MUL: return "mul-t";
 130     case Token::MOD: return "mod-t";
 131     case Token::DIV: return "div-t";
 132     case Token::BIT_AND: return "bit-and-t";
 133     case Token::BIT_OR: return "bit-or-t";
 134     case Token::BIT_XOR: return "bit-xor-t";
 135     case Token::ROR: return "ror-t";
 136     case Token::SHL: return "shl-t";
 137     case Token::SAR: return "sar-t";
 138     case Token::SHR: return "shr-t";
 139     default:
 140       UNREACHABLE();
 141       return NULL;
 142   }
 143 }
 144
 145
 146 bool LGoto::HasInterestingComment(LCodeGen* gen) const {
 147   return !gen->IsNextEmittedBlock(block_id());
 148 }
 149
 150
 151 void LGoto::PrintDataTo(StringStream* stream) {
 152   stream->Add("B%d", block_id());
 153 }
 154
 155
 156 void LBranch::PrintDataTo(StringStream* stream) {
 157   stream->Add("B%d | B%d on ", true_block_id(), false_block_id());
 158   value()->PrintTo(stream);
 159 }
 160
 161
 162 void LCompareNumericAndBranch::PrintDataTo(StringStream* stream) {
 163   stream->Add("if ");
 164   left()->PrintTo(stream);
 165   stream->Add(" %s ", Token::String(op()));
 166   right()->PrintTo(stream);
 167   stream->Add(" then B%d else B%d", true_block_id(), false_block_id());
 168 }
 169
 170
 171 void LIsObjectAndBranch::PrintDataTo(StringStream* stream) {
 172   stream->Add("if is_object(");
 173   value()->PrintTo(stream);
 174   stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
 175 }
 176
 177
 178 void LIsStringAndBranch::PrintDataTo(StringStream* stream) {
 179   stream->Add("if is_string(");
 180   value()->PrintTo(stream);
 181   stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
 182 }
 183
 184
 185 void LIsSmiAndBranch::PrintDataTo(StringStream* stream) {
 186   stream->Add("if is_smi(");
 187   value()->PrintTo(stream);
 188   stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
 189 }
 190
 191
 192 void LIsUndetectableAndBranch::PrintDataTo(StringStream* stream) {
 193   stream->Add("if is_undetectable(");
 194   value()->PrintTo(stream);
 195   stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
 196 }
 197
 198
 199 void LStringCompareAndBranch::PrintDataTo(StringStream* stream) {
 200   stream->Add("if string_compare(");
 201   left()->PrintTo(stream);
 202   right()->PrintTo(stream);
 203   stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
 204 }
 205
 206
 207 void LHasInstanceTypeAndBranch::PrintDataTo(StringStream* stream) {
 208   stream->Add("if has_instance_type(");
 209   value()->PrintTo(stream);
 210   stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
 211 }
 212
 213
 214 void LHasCachedArrayIndexAndBranch::PrintDataTo(StringStream* stream) {
 215   stream->Add("if has_cached_array_index(");
 216   value()->PrintTo(stream);
 217   stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
 218 }
 219
 220
 221 void LClassOfTestAndBranch::PrintDataTo(StringStream* stream) {
 222   stream->Add("if class_of_test(");
 223   value()->PrintTo(stream);
 224   stream->Add(", \"%o\") then B%d else B%d",
 225               *hydrogen()->class_name(),
 226               true_block_id(),
 227               false_block_id());
 228 }
 229
 230
 231 void LTypeofIsAndBranch::PrintDataTo(StringStream* stream) {
 232   stream->Add("if typeof ");
 233   value()->PrintTo(stream);
 234   stream->Add(" == \"%s\" then B%d else B%d",
 235               hydrogen()->type_literal()->ToCString().get(),
 236               true_block_id(), false_block_id());
 237 }
 238
 239
 240 void LStoreCodeEntry::PrintDataTo(StringStream* stream) {
 241   stream->Add(" = ");
 242   function()->PrintTo(stream);
 243   stream->Add(".code_entry = ");
 244   code_object()->PrintTo(stream);
 245 }
 246
 247
 248 void LInnerAllocatedObject::PrintDataTo(StringStream* stream) {
 249   stream->Add(" = ");
 250   base_object()->PrintTo(stream);
 251   stream->Add(" + ");
 252   offset()->PrintTo(stream);
 253 }
 254
 255
 256 void LCallJSFunction::PrintDataTo(StringStream* stream) {
 257   stream->Add("= ");
 258   function()->PrintTo(stream);
 259   stream->Add("#%d / ", arity());
 260 }
 261
 262
 263 void LCallWithDescriptor::PrintDataTo(StringStream* stream) {
 264   for (int i = 0; i < InputCount(); i++) {
 265     InputAt(i)->PrintTo(stream);
 266     stream->Add(" ");
 267   }
 268   stream->Add("#%d / ", arity());
 269 }
 270
 271
 272 void LLoadContextSlot::PrintDataTo(StringStream* stream) {
 273   context()->PrintTo(stream);
 274   stream->Add("[%d]", slot_index());
 275 }
 276
 277
 278 void LStoreContextSlot::PrintDataTo(StringStream* stream) {
 279   context()->PrintTo(stream);
 280   stream->Add("[%d] <- ", slot_index());
 281   value()->PrintTo(stream);
 282 }
 283
 284
 285 void LInvokeFunction::PrintDataTo(StringStream* stream) {
 286   stream->Add("= ");
 287   function()->PrintTo(stream);
 288   stream->Add(" #%d / ", arity());
 289 }
 290
 291
 292 void LCallNew::PrintDataTo(StringStream* stream) {
 293   stream->Add("= ");
 294   constructor()->PrintTo(stream);
 295   stream->Add(" #%d / ", arity());
 296 }
 297
 298
 299 void LCallNewArray::PrintDataTo(StringStream* stream) {
 300   stream->Add("= ");
 301   constructor()->PrintTo(stream);
 302   stream->Add(" #%d / ", arity());
 303   ElementsKind kind = hydrogen()->elements_kind();
 304   stream->Add(" (%s) ", ElementsKindToString(kind));
 305 }
 306
 307
 308 void LAccessArgumentsAt::PrintDataTo(StringStream* stream) {
 309   arguments()->PrintTo(stream);
 310   stream->Add(" length ");
 311   length()->PrintTo(stream);
 312   stream->Add(" index ");
 313   index()->PrintTo(stream);
 314 }
 315
 316
 317 void LStoreNamedField::PrintDataTo(StringStream* stream) {
 318   object()->PrintTo(stream);
 319   OStringStream os;
 320   os << hydrogen()->access() << " <- ";
 321   stream->Add(os.c_str());
 322   value()->PrintTo(stream);
 323 }
 324
 325
 326 void LStoreNamedGeneric::PrintDataTo(StringStream* stream) {
 327   object()->PrintTo(stream);
 328   stream->Add(".");
 329   stream->Add(String::cast(*name())->ToCString().get());
 330   stream->Add(" <- ");
 331   value()->PrintTo(stream);
 332 }
 333
 334
 335 void LLoadKeyed::PrintDataTo(StringStream* stream) {
 336   elements()->PrintTo(stream);
 337   stream->Add("[");
 338   key()->PrintTo(stream);
 339   if (hydrogen()->IsDehoisted()) {
 340     stream->Add(" + %d]", base_offset());
 341   } else {
 342     stream->Add("]");
 343   }
 344 }
 345
 346
 347 void LStoreKeyed::PrintDataTo(StringStream* stream) {
 348   elements()->PrintTo(stream);
 349   stream->Add("[");
 350   key()->PrintTo(stream);
 351   if (hydrogen()->IsDehoisted()) {
 352     stream->Add(" + %d] <-", base_offset());
 353   } else {
 354     stream->Add("] <- ");
 355   }
 356
 357   if (value() == NULL) {
 358     DCHECK(hydrogen()->IsConstantHoleStore() &&
 359            hydrogen()->value()->representation().IsDouble());
 360     stream->Add("<the hole(nan)>");
 361   } else {
 362     value()->PrintTo(stream);
 363   }
 364 }
 365
 366
 367 void LStoreKeyedGeneric::PrintDataTo(StringStream* stream) {
 368   object()->PrintTo(stream);
 369   stream->Add("[");
 370   key()->PrintTo(stream);
 371   stream->Add("] <- ");
 372   value()->PrintTo(stream);
 373 }
 374
 375
 376 void LTransitionElementsKind::PrintDataTo(StringStream* stream) {
 377   object()->PrintTo(stream);
 378   stream->Add(" %p -> %p", *original_map(), *transitioned_map());
 379 }
 380
 381
 382 int LPlatformChunk::GetNextSpillIndex(RegisterKind kind) {
 383   // Skip a slot if for a double-width slot.
 384   if (kind == DOUBLE_REGISTERS) spill_slot_count_++;
 385   return spill_slot_count_++;
 386 }
 387
 388
 389 LOperand* LPlatformChunk::GetNextSpillSlot(RegisterKind kind)  {
 390   int index = GetNextSpillIndex(kind);
 391   if (kind == DOUBLE_REGISTERS) {
 392     return LDoubleStackSlot::Create(index, zone());
 393   } else {
 394     DCHECK(kind == GENERAL_REGISTERS);
 395     return LStackSlot::Create(index, zone());
 396   }
 397 }
 398
 399
 400 LPlatformChunk* LChunkBuilder::Build() {
 401   DCHECK(is_unused());
 402   chunk_ = new(zone()) LPlatformChunk(info(), graph());
 403   LPhase phase("L_Building chunk", chunk_);
 404   status_ = BUILDING;
 405
 406   // If compiling for OSR, reserve space for the unoptimized frame,
 407   // which will be subsumed into this frame.
 408   if (graph()->has_osr()) {
 409     for (int i = graph()->osr()->UnoptimizedFrameSlots(); i > 0; i--) {
 410       chunk_->GetNextSpillIndex(GENERAL_REGISTERS);
 411     }
 412   }
 413
 414   const ZoneList<HBasicBlock*>* blocks = graph()->blocks();
 415   for (int i = 0; i < blocks->length(); i++) {
 416     HBasicBlock* next = NULL;
 417     if (i < blocks->length() - 1) next = blocks->at(i + 1);
 418     DoBasicBlock(blocks->at(i), next);
 419     if (is_aborted()) return NULL;
 420   }
 421   status_ = DONE;
 422   return chunk_;
 423 }
 424
 425
 426 LUnallocated* LChunkBuilder::ToUnallocated(Register reg) {
 427   return new(zone()) LUnallocated(LUnallocated::FIXED_REGISTER,
 428                                   Register::ToAllocationIndex(reg));
 429 }
 430
 431
 432 LUnallocated* LChunkBuilder::ToUnallocated(DoubleRegister reg) {
 433   return new(zone()) LUnallocated(LUnallocated::FIXED_DOUBLE_REGISTER,
 434                                   DoubleRegister::ToAllocationIndex(reg));
 435 }
 436
 437
 438 LOperand* LChunkBuilder::UseFixed(HValue* value, Register fixed_register) {
 439   return Use(value, ToUnallocated(fixed_register));
 440 }
 441
 442
 443 LOperand* LChunkBuilder::UseFixedDouble(HValue* value, DoubleRegister reg) {
 444   return Use(value, ToUnallocated(reg));
 445 }
 446
 447
 448 LOperand* LChunkBuilder::UseRegister(HValue* value) {
 449   return Use(value, new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER));
 450 }
 451
 452
 453 LOperand* LChunkBuilder::UseRegisterAtStart(HValue* value) {
 454   return Use(value,
 455              new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER,
 456                                       LUnallocated::USED_AT_START));
 457 }
 458
 459
 460 LOperand* LChunkBuilder::UseTempRegister(HValue* value) {
 461   return Use(value, new(zone()) LUnallocated(LUnallocated::WRITABLE_REGISTER));
 462 }
 463
 464
 465 LOperand* LChunkBuilder::Use(HValue* value) {
 466   return Use(value, new(zone()) LUnallocated(LUnallocated::NONE));
 467 }
 468
 469
 470 LOperand* LChunkBuilder::UseAtStart(HValue* value) {
 471   return Use(value, new(zone()) LUnallocated(LUnallocated::NONE,
 472                                              LUnallocated::USED_AT_START));
 473 }
 474
 475
 476 LOperand* LChunkBuilder::UseOrConstant(HValue* value) {
 477   return value->IsConstant()
 478       ? chunk_->DefineConstantOperand(HConstant::cast(value))
 479       : Use(value);
 480 }
 481
 482
 483 LOperand* LChunkBuilder::UseOrConstantAtStart(HValue* value) {
 484   return value->IsConstant()
 485       ? chunk_->DefineConstantOperand(HConstant::cast(value))
 486       : UseAtStart(value);
 487 }
 488
 489
 490 LOperand* LChunkBuilder::UseRegisterOrConstant(HValue* value) {
 491   return value->IsConstant()
 492       ? chunk_->DefineConstantOperand(HConstant::cast(value))
 493       : UseRegister(value);
 494 }
 495
 496
 497 LOperand* LChunkBuilder::UseRegisterOrConstantAtStart(HValue* value) {
 498   return value->IsConstant()
 499       ? chunk_->DefineConstantOperand(HConstant::cast(value))
 500       : UseRegisterAtStart(value);
 501 }
 502
 503
 504 LOperand* LChunkBuilder::UseConstant(HValue* value) {
 505   return chunk_->DefineConstantOperand(HConstant::cast(value));
 506 }
 507
 508
 509 LOperand* LChunkBuilder::UseAny(HValue* value) {
 510   return value->IsConstant()
 511       ? chunk_->DefineConstantOperand(HConstant::cast(value))
 512       :  Use(value, new(zone()) LUnallocated(LUnallocated::ANY));
 513 }
 514
 515
 516 LOperand* LChunkBuilder::Use(HValue* value, LUnallocated* operand) {
 517   if (value->EmitAtUses()) {
 518     HInstruction* instr = HInstruction::cast(value);
 519     VisitInstruction(instr);
 520   }
 521   operand->set_virtual_register(value->id());
 522   return operand;
 523 }
 524
 525
 526 LInstruction* LChunkBuilder::Define(LTemplateResultInstruction<1>* instr,
 527                                     LUnallocated* result) {
 528   result->set_virtual_register(current_instruction_->id());
 529   instr->set_result(result);
 530   return instr;
 531 }
 532
 533
 534 LInstruction* LChunkBuilder::DefineAsRegister(
 535     LTemplateResultInstruction<1>* instr) {
 536   return Define(instr,
 537                 new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER));
 538 }
 539
 540
 541 LInstruction* LChunkBuilder::DefineAsSpilled(
 542     LTemplateResultInstruction<1>* instr, int index) {
 543   return Define(instr,
 544                 new(zone()) LUnallocated(LUnallocated::FIXED_SLOT, index));
 545 }
 546
 547
 548 LInstruction* LChunkBuilder::DefineSameAsFirst(
 549     LTemplateResultInstruction<1>* instr) {
 550   return Define(instr,
 551                 new(zone()) LUnallocated(LUnallocated::SAME_AS_FIRST_INPUT));
 552 }
 553
 554
 555 LInstruction* LChunkBuilder::DefineFixed(
 556     LTemplateResultInstruction<1>* instr, Register reg) {
 557   return Define(instr, ToUnallocated(reg));
 558 }
 559
 560
 561 LInstruction* LChunkBuilder::DefineFixedDouble(
 562     LTemplateResultInstruction<1>* instr, DoubleRegister reg) {
 563   return Define(instr, ToUnallocated(reg));
 564 }
 565
 566
 567 LInstruction* LChunkBuilder::AssignEnvironment(LInstruction* instr) {
 568   HEnvironment* hydrogen_env = current_block_->last_environment();
 569   int argument_index_accumulator = 0;
 570   ZoneList<HValue*> objects_to_materialize(0, zone());
 571   instr->set_environment(CreateEnvironment(hydrogen_env,
 572                                            &argument_index_accumulator,
 573                                            &objects_to_materialize));
 574   return instr;
 575 }
 576
 577
 578 LInstruction* LChunkBuilder::MarkAsCall(LInstruction* instr,
 579                                         HInstruction* hinstr,
 580                                         CanDeoptimize can_deoptimize) {
 581   info()->MarkAsNonDeferredCalling();
 582 #ifdef DEBUG
 583   instr->VerifyCall();
 584 #endif
 585   instr->MarkAsCall();
 586   instr = AssignPointerMap(instr);
 587
 588   // If instruction does not have side-effects lazy deoptimization
 589   // after the call will try to deoptimize to the point before the call.
 590   // Thus we still need to attach environment to this call even if
 591   // call sequence can not deoptimize eagerly.
 592   bool needs_environment =
 593       (can_deoptimize == CAN_DEOPTIMIZE_EAGERLY) ||
 594       !hinstr->HasObservableSideEffects();
 595   if (needs_environment && !instr->HasEnvironment()) {
 596     instr = AssignEnvironment(instr);
 597     // We can't really figure out if the environment is needed or not.
 598     instr->environment()->set_has_been_used();
 599   }
 600
 601   return instr;
 602 }
 603
 604
 605 LInstruction* LChunkBuilder::AssignPointerMap(LInstruction* instr) {
 606   DCHECK(!instr->HasPointerMap());
 607   instr->set_pointer_map(new(zone()) LPointerMap(zone()));
 608   return instr;
 609 }
 610
 611
 612 LUnallocated* LChunkBuilder::TempRegister() {
 613   LUnallocated* operand =
 614       new(zone()) LUnallocated(LUnallocated::MUST_HAVE_REGISTER);
 615   int vreg = allocator_->GetVirtualRegister();
 616   if (!allocator_->AllocationOk()) {
 617     Abort(kOutOfVirtualRegistersWhileTryingToAllocateTempRegister);
 618     vreg = 0;
 619   }
 620   operand->set_virtual_register(vreg);
 621   return operand;
 622 }
 623
 624
 625 LUnallocated* LChunkBuilder::TempDoubleRegister() {
 626   LUnallocated* operand =
 627       new(zone()) LUnallocated(LUnallocated::MUST_HAVE_DOUBLE_REGISTER);
 628   int vreg = allocator_->GetVirtualRegister();
 629   if (!allocator_->AllocationOk()) {
 630     Abort(kOutOfVirtualRegistersWhileTryingToAllocateTempRegister);
 631     vreg = 0;
 632   }
 633   operand->set_virtual_register(vreg);
 634   return operand;
 635 }
 636
 637
 638 LOperand* LChunkBuilder::FixedTemp(Register reg) {
 639   LUnallocated* operand = ToUnallocated(reg);
 640   DCHECK(operand->HasFixedPolicy());
 641   return operand;
 642 }
 643
 644
 645 LOperand* LChunkBuilder::FixedTemp(DoubleRegister reg) {
 646   LUnallocated* operand = ToUnallocated(reg);
 647   DCHECK(operand->HasFixedPolicy());
 648   return operand;
 649 }
 650
 651
 652 LInstruction* LChunkBuilder::DoBlockEntry(HBlockEntry* instr) {
 653   return new(zone()) LLabel(instr->block());
 654 }
 655
 656
 657 LInstruction* LChunkBuilder::DoDummyUse(HDummyUse* instr) {
 658   return DefineAsRegister(new(zone()) LDummyUse(UseAny(instr->value())));
 659 }
 660
 661
 662 LInstruction* LChunkBuilder::DoEnvironmentMarker(HEnvironmentMarker* instr) {
 663   UNREACHABLE();
 664   return NULL;
 665 }
 666
 667
 668 LInstruction* LChunkBuilder::DoDeoptimize(HDeoptimize* instr) {
 669   return AssignEnvironment(new(zone()) LDeoptimize);
 670 }
 671
 672
 673 LInstruction* LChunkBuilder::DoShift(Token::Value op,
 674                                      HBitwiseBinaryOperation* instr) {
 675   if (instr->representation().IsSmiOrInteger32()) {
 676     DCHECK(instr->left()->representation().Equals(instr->representation()));
 677     DCHECK(instr->right()->representation().Equals(instr->representation()));
 678     LOperand* left = UseRegisterAtStart(instr->left());
 679
 680     HValue* right_value = instr->right();
 681     LOperand* right = NULL;
 682     int constant_value = 0;
 683     bool does_deopt = false;
 684     if (right_value->IsConstant()) {
 685       HConstant* constant = HConstant::cast(right_value);
 686       right = chunk_->DefineConstantOperand(constant);
 687       constant_value = constant->Integer32Value() & 0x1f;
 688       // Left shifts can deoptimize if we shift by > 0 and the result cannot be
 689       // truncated to smi.
 690       if (instr->representation().IsSmi() && constant_value > 0) {
 691         does_deopt = !instr->CheckUsesForFlag(HValue::kTruncatingToSmi);
 692       }
 693     } else {
 694       right = UseRegisterAtStart(right_value);
 695     }
 696
 697     // Shift operations can only deoptimize if we do a logical shift
 698     // by 0 and the result cannot be truncated to int32.
 699     if (op == Token::SHR && constant_value == 0) {
 700       if (FLAG_opt_safe_uint32_operations) {
 701         does_deopt = !instr->CheckFlag(HInstruction::kUint32);
 702       } else {
 703         does_deopt = !instr->CheckUsesForFlag(HValue::kTruncatingToInt32);
 704       }
 705     }
 706
 707     LInstruction* result =
 708         DefineAsRegister(new(zone()) LShiftI(op, left, right, does_deopt));
 709     return does_deopt ? AssignEnvironment(result) : result;
 710   } else {
 711     return DoArithmeticT(op, instr);
 712   }
 713 }
 714
 715
 716 LInstruction* LChunkBuilder::DoArithmeticD(Token::Value op,
 717                                            HArithmeticBinaryOperation* instr) {
 718   DCHECK(instr->representation().IsDouble());
 719   DCHECK(instr->left()->representation().IsDouble());
 720   DCHECK(instr->right()->representation().IsDouble());
 721   if (op == Token::MOD) {
 722     LOperand* left = UseFixedDouble(instr->left(), d0);
 723     LOperand* right = UseFixedDouble(instr->right(), d1);
 724     LArithmeticD* result = new(zone()) LArithmeticD(op, left, right);
 725     return MarkAsCall(DefineFixedDouble(result, d0), instr);
 726   } else {
 727     LOperand* left = UseRegisterAtStart(instr->left());
 728     LOperand* right = UseRegisterAtStart(instr->right());
 729     LArithmeticD* result = new(zone()) LArithmeticD(op, left, right);
 730     return DefineAsRegister(result);
 731   }
 732 }
 733
 734
 735 LInstruction* LChunkBuilder::DoArithmeticT(Token::Value op,
 736                                            HBinaryOperation* instr) {
 737   HValue* left = instr->left();
 738   HValue* right = instr->right();
 739   DCHECK(left->representation().IsTagged());
 740   DCHECK(right->representation().IsTagged());
 741   LOperand* context = UseFixed(instr->context(), cp);
 742   LOperand* left_operand = UseFixed(left, r1);
 743   LOperand* right_operand = UseFixed(right, r0);
 744   LArithmeticT* result =
 745       new(zone()) LArithmeticT(op, context, left_operand, right_operand);
 746   return MarkAsCall(DefineFixed(result, r0), instr);
 747 }
 748
 749
 750 void LChunkBuilder::DoBasicBlock(HBasicBlock* block, HBasicBlock* next_block) {
 751   DCHECK(is_building());
 752   current_block_ = block;
 753   next_block_ = next_block;
 754   if (block->IsStartBlock()) {
 755     block->UpdateEnvironment(graph_->start_environment());
 756     argument_count_ = 0;
 757   } else if (block->predecessors()->length() == 1) {
 758     // We have a single predecessor => copy environment and outgoing
 759     // argument count from the predecessor.
 760     DCHECK(block->phis()->length() == 0);
 761     HBasicBlock* pred = block->predecessors()->at(0);
 762     HEnvironment* last_environment = pred->last_environment();
 763     DCHECK(last_environment != NULL);
 764     // Only copy the environment, if it is later used again.
 765     if (pred->end()->SecondSuccessor() == NULL) {
 766       DCHECK(pred->end()->FirstSuccessor() == block);
 767     } else {
 768       if (pred->end()->FirstSuccessor()->block_id() > block->block_id() ||
 769           pred->end()->SecondSuccessor()->block_id() > block->block_id()) {
 770         last_environment = last_environment->Copy();
 771       }
 772     }
 773     block->UpdateEnvironment(last_environment);
 774     DCHECK(pred->argument_count() >= 0);
 775     argument_count_ = pred->argument_count();
 776   } else {
 777     // We are at a state join => process phis.
 778     HBasicBlock* pred = block->predecessors()->at(0);
 779     // No need to copy the environment, it cannot be used later.
 780     HEnvironment* last_environment = pred->last_environment();
 781     for (int i = 0; i < block->phis()->length(); ++i) {
 782       HPhi* phi = block->phis()->at(i);
 783       if (phi->HasMergedIndex()) {
 784         last_environment->SetValueAt(phi->merged_index(), phi);
 785       }
 786     }
 787     for (int i = 0; i < block->deleted_phis()->length(); ++i) {
 788       if (block->deleted_phis()->at(i) < last_environment->length()) {
 789         last_environment->SetValueAt(block->deleted_phis()->at(i),
 790                                      graph_->GetConstantUndefined());
 791       }
 792     }
 793     block->UpdateEnvironment(last_environment);
 794     // Pick up the outgoing argument count of one of the predecessors.
 795     argument_count_ = pred->argument_count();
 796   }
 797   HInstruction* current = block->first();
 798   int start = chunk_->instructions()->length();
 799   while (current != NULL && !is_aborted()) {
 800     // Code for constants in registers is generated lazily.
 801     if (!current->EmitAtUses()) {
 802       VisitInstruction(current);
 803     }
 804     current = current->next();
 805   }
 806   int end = chunk_->instructions()->length() - 1;
 807   if (end >= start) {
 808     block->set_first_instruction_index(start);
 809     block->set_last_instruction_index(end);
 810   }
 811   block->set_argument_count(argument_count_);
 812   next_block_ = NULL;
 813   current_block_ = NULL;
 814 }
 815
 816
 817 void LChunkBuilder::VisitInstruction(HInstruction* current) {
 818   HInstruction* old_current = current_instruction_;
 819   current_instruction_ = current;
 820
 821   LInstruction* instr = NULL;
 822   if (current->CanReplaceWithDummyUses()) {
 823     if (current->OperandCount() == 0) {
 824       instr = DefineAsRegister(new(zone()) LDummy());
 825     } else {
 826       DCHECK(!current->OperandAt(0)->IsControlInstruction());
 827       instr = DefineAsRegister(new(zone())
 828           LDummyUse(UseAny(current->OperandAt(0))));
 829     }
 830     for (int i = 1; i < current->OperandCount(); ++i) {
 831       if (current->OperandAt(i)->IsControlInstruction()) continue;
 832       LInstruction* dummy =
 833           new(zone()) LDummyUse(UseAny(current->OperandAt(i)));
 834       dummy->set_hydrogen_value(current);
 835       chunk_->AddInstruction(dummy, current_block_);
 836     }
 837   } else {
 838     HBasicBlock* successor;
 839     if (current->IsControlInstruction() &&
 840         HControlInstruction::cast(current)->KnownSuccessorBlock(&successor) &&
 841         successor != NULL) {
 842       instr = new(zone()) LGoto(successor);
 843     } else {
 844       instr = current->CompileToLithium(this);
 845     }
 846   }
 847
 848   argument_count_ += current->argument_delta();
 849   DCHECK(argument_count_ >= 0);
 850
 851   if (instr != NULL) {
 852     AddInstruction(instr, current);
 853   }
 854
 855   current_instruction_ = old_current;
 856 }
 857
 858
 859 void LChunkBuilder::AddInstruction(LInstruction* instr,
 860                                    HInstruction* hydrogen_val) {
 861   // Associate the hydrogen instruction first, since we may need it for
 862   // the ClobbersRegisters() or ClobbersDoubleRegisters() calls below.
 863   instr->set_hydrogen_value(hydrogen_val);
 864
 865 #if DEBUG
 866   // Make sure that the lithium instruction has either no fixed register
 867   // constraints in temps or the result OR no uses that are only used at
 868   // start. If this invariant doesn't hold, the register allocator can decide
 869   // to insert a split of a range immediately before the instruction due to an
 870   // already allocated register needing to be used for the instruction's fixed
 871   // register constraint. In this case, The register allocator won't see an
 872   // interference between the split child and the use-at-start (it would if
 873   // the it was just a plain use), so it is free to move the split child into
 874   // the same register that is used for the use-at-start.
 875   // See https://code.google.com/p/chromium/issues/detail?id=201590
 876   if (!(instr->ClobbersRegisters() &&
 877         instr->ClobbersDoubleRegisters(isolate()))) {
 878     int fixed = 0;
 879     int used_at_start = 0;
 880     for (UseIterator it(instr); !it.Done(); it.Advance()) {
 881       LUnallocated* operand = LUnallocated::cast(it.Current());
 882       if (operand->IsUsedAtStart()) ++used_at_start;
 883     }
 884     if (instr->Output() != NULL) {
 885       if (LUnallocated::cast(instr->Output())->HasFixedPolicy()) ++fixed;
 886     }
 887     for (TempIterator it(instr); !it.Done(); it.Advance()) {
 888       LUnallocated* operand = LUnallocated::cast(it.Current());
 889       if (operand->HasFixedPolicy()) ++fixed;
 890     }
 891     DCHECK(fixed == 0 || used_at_start == 0);
 892   }
 893 #endif
 894
 895   if (FLAG_stress_pointer_maps && !instr->HasPointerMap()) {
 896     instr = AssignPointerMap(instr);
 897   }
 898   if (FLAG_stress_environments && !instr->HasEnvironment()) {
 899     instr = AssignEnvironment(instr);
 900   }
 901   chunk_->AddInstruction(instr, current_block_);
 902
 903   if (instr->IsCall()) {
 904     HValue* hydrogen_value_for_lazy_bailout = hydrogen_val;
 905     LInstruction* instruction_needing_environment = NULL;
 906     if (hydrogen_val->HasObservableSideEffects()) {
 907       HSimulate* sim = HSimulate::cast(hydrogen_val->next());
 908       instruction_needing_environment = instr;
 909       sim->ReplayEnvironment(current_block_->last_environment());
 910       hydrogen_value_for_lazy_bailout = sim;
 911     }
 912     LInstruction* bailout = AssignEnvironment(new(zone()) LLazyBailout());
 913     bailout->set_hydrogen_value(hydrogen_value_for_lazy_bailout);
 914     chunk_->AddInstruction(bailout, current_block_);
 915     if (instruction_needing_environment != NULL) {
 916       // Store the lazy deopt environment with the instruction if needed.
 917       // Right now it is only used for LInstanceOfKnownGlobal.
 918       instruction_needing_environment->
 919           SetDeferredLazyDeoptimizationEnvironment(bailout->environment());
 920     }
 921   }
 922 }
 923
 924
 925 LInstruction* LChunkBuilder::DoGoto(HGoto* instr) {
 926   return new(zone()) LGoto(instr->FirstSuccessor());
 927 }
 928
 929
 930 LInstruction* LChunkBuilder::DoBranch(HBranch* instr) {
 931   HValue* value = instr->value();
 932   Representation r = value->representation();
 933   HType type = value->type();
 934   ToBooleanStub::Types expected = instr->expected_input_types();
 935   if (expected.IsEmpty()) expected = ToBooleanStub::Types::Generic();
 936
 937   bool easy_case = !r.IsTagged() || type.IsBoolean() || type.IsSmi() ||
 938       type.IsJSArray() || type.IsHeapNumber() || type.IsString();
 939   LInstruction* branch = new(zone()) LBranch(UseRegister(value));
 940   if (!easy_case &&
 941       ((!expected.Contains(ToBooleanStub::SMI) && expected.NeedsMap()) ||
 942        !expected.IsGeneric())) {
 943     branch = AssignEnvironment(branch);
 944   }
 945   return branch;
 946 }
 947
 948
 949 LInstruction* LChunkBuilder::DoDebugBreak(HDebugBreak* instr) {
 950   return new(zone()) LDebugBreak();
 951 }
 952
 953
 954 LInstruction* LChunkBuilder::DoCompareMap(HCompareMap* instr) {
 955   DCHECK(instr->value()->representation().IsTagged());
 956   LOperand* value = UseRegisterAtStart(instr->value());
 957   LOperand* temp = TempRegister();
 958   return new(zone()) LCmpMapAndBranch(value, temp);
 959 }
 960
 961
 962 LInstruction* LChunkBuilder::DoArgumentsLength(HArgumentsLength* instr) {
 963   info()->MarkAsRequiresFrame();
 964   LOperand* value = UseRegister(instr->value());
 965   return DefineAsRegister(new(zone()) LArgumentsLength(value));
 966 }
 967
 968
 969 LInstruction* LChunkBuilder::DoArgumentsElements(HArgumentsElements* elems) {
 970   info()->MarkAsRequiresFrame();
 971   return DefineAsRegister(new(zone()) LArgumentsElements);
 972 }
 973
 974
 975 LInstruction* LChunkBuilder::DoInstanceOf(HInstanceOf* instr) {
 976   LOperand* context = UseFixed(instr->context(), cp);
 977   LInstanceOf* result =
 978       new(zone()) LInstanceOf(context, UseFixed(instr->left(), r0),
 979                               UseFixed(instr->right(), r1));
 980   return MarkAsCall(DefineFixed(result, r0), instr);
 981 }
 982
 983
 984 LInstruction* LChunkBuilder::DoInstanceOfKnownGlobal(
 985     HInstanceOfKnownGlobal* instr) {
 986   LInstanceOfKnownGlobal* result =
 987       new(zone()) LInstanceOfKnownGlobal(
 988           UseFixed(instr->context(), cp),
 989           UseFixed(instr->left(), r0),
 990           FixedTemp(r4));
 991   return MarkAsCall(DefineFixed(result, r0), instr);
 992 }
 993
 994
 995 LInstruction* LChunkBuilder::DoWrapReceiver(HWrapReceiver* instr) {
 996   LOperand* receiver = UseRegisterAtStart(instr->receiver());
 997   LOperand* function = UseRegisterAtStart(instr->function());
 998   LWrapReceiver* result = new(zone()) LWrapReceiver(receiver, function);
 999   return AssignEnvironment(DefineAsRegister(result));
1000 }
1001
1002
1003 LInstruction* LChunkBuilder::DoApplyArguments(HApplyArguments* instr) {
1004   LOperand* function = UseFixed(instr->function(), r1);
1005   LOperand* receiver = UseFixed(instr->receiver(), r0);
1006   LOperand* length = UseFixed(instr->length(), r2);
1007   LOperand* elements = UseFixed(instr->elements(), r3);
1008   LApplyArguments* result = new(zone()) LApplyArguments(function,
1009                                                 receiver,
1010                                                 length,
1011                                                 elements);
1012   return MarkAsCall(DefineFixed(result, r0), instr, CAN_DEOPTIMIZE_EAGERLY);
1013 }
1014
1015
1016 LInstruction* LChunkBuilder::DoPushArguments(HPushArguments* instr) {
1017   int argc = instr->OperandCount();
1018   for (int i = 0; i < argc; ++i) {
1019     LOperand* argument = Use(instr->argument(i));
1020     AddInstruction(new(zone()) LPushArgument(argument), instr);
1021   }
1022   return NULL;
1023 }
1024
1025
1026 LInstruction* LChunkBuilder::DoStoreCodeEntry(
1027     HStoreCodeEntry* store_code_entry) {
1028   LOperand* function = UseRegister(store_code_entry->function());
1029   LOperand* code_object = UseTempRegister(store_code_entry->code_object());
1030   return new(zone()) LStoreCodeEntry(function, code_object);
1031 }
1032
1033
1034 LInstruction* LChunkBuilder::DoInnerAllocatedObject(
1035     HInnerAllocatedObject* instr) {
1036   LOperand* base_object = UseRegisterAtStart(instr->base_object());
1037   LOperand* offset = UseRegisterOrConstantAtStart(instr->offset());
1038   return DefineAsRegister(
1039       new(zone()) LInnerAllocatedObject(base_object, offset));
1040 }
1041
1042
1043 LInstruction* LChunkBuilder::DoThisFunction(HThisFunction* instr) {
1044   return instr->HasNoUses()
1045       ? NULL
1046       : DefineAsRegister(new(zone()) LThisFunction);
1047 }
1048
1049
1050 LInstruction* LChunkBuilder::DoContext(HContext* instr) {
1051   if (instr->HasNoUses()) return NULL;
1052
1053   if (info()->IsStub()) {
1054     return DefineFixed(new(zone()) LContext, cp);
1055   }
1056
1057   return DefineAsRegister(new(zone()) LContext);
1058 }
1059
1060
1061 LInstruction* LChunkBuilder::DoDeclareGlobals(HDeclareGlobals* instr) {
1062   LOperand* context = UseFixed(instr->context(), cp);
1063   return MarkAsCall(new(zone()) LDeclareGlobals(context), instr);
1064 }
1065
1066
1067 LInstruction* LChunkBuilder::DoCallJSFunction(
1068     HCallJSFunction* instr) {
1069   LOperand* function = UseFixed(instr->function(), r1);
1070
1071   LCallJSFunction* result = new(zone()) LCallJSFunction(function);
1072
1073   return MarkAsCall(DefineFixed(result, r0), instr);
1074 }
1075
1076
1077 LInstruction* LChunkBuilder::DoCallWithDescriptor(
1078     HCallWithDescriptor* instr) {
1079   CallInterfaceDescriptor descriptor = instr->descriptor();
1080
1081   LOperand* target = UseRegisterOrConstantAtStart(instr->target());
1082   ZoneList<LOperand*> ops(instr->OperandCount(), zone());
1083   ops.Add(target, zone());
1084   for (int i = 1; i < instr->OperandCount(); i++) {
1085     LOperand* op =
1086         UseFixed(instr->OperandAt(i), descriptor.GetParameterRegister(i - 1));
1087     ops.Add(op, zone());
1088   }
1089
1090   LCallWithDescriptor* result = new(zone()) LCallWithDescriptor(
1091       descriptor, ops, zone());
1092   return MarkAsCall(DefineFixed(result, r0), instr);
1093 }
1094
1095
1096 LInstruction* LChunkBuilder::DoTailCallThroughMegamorphicCache(
1097     HTailCallThroughMegamorphicCache* instr) {
1098   LOperand* context = UseFixed(instr->context(), cp);
1099   LOperand* receiver_register =
1100       UseFixed(instr->receiver(), LoadDescriptor::ReceiverRegister());
1101   LOperand* name_register =
1102       UseFixed(instr->name(), LoadDescriptor::NameRegister());
1103   // Not marked as call. It can't deoptimize, and it never returns.
1104   return new (zone()) LTailCallThroughMegamorphicCache(
1105       context, receiver_register, name_register);
1106 }
1107
1108
1109 LInstruction* LChunkBuilder::DoInvokeFunction(HInvokeFunction* instr) {
1110   LOperand* context = UseFixed(instr->context(), cp);
1111   LOperand* function = UseFixed(instr->function(), r1);
1112   LInvokeFunction* result = new(zone()) LInvokeFunction(context, function);
1113   return MarkAsCall(DefineFixed(result, r0), instr, CANNOT_DEOPTIMIZE_EAGERLY);
1114 }
1115
1116
1117 LInstruction* LChunkBuilder::DoUnaryMathOperation(HUnaryMathOperation* instr) {
1118   switch (instr->op()) {
1119     case kMathFloor:
1120       return DoMathFloor(instr);
1121     case kMathRound:
1122       return DoMathRound(instr);
1123     case kMathFround:
1124       return DoMathFround(instr);
1125     case kMathAbs:
1126       return DoMathAbs(instr);
1127     case kMathLog:
1128       return DoMathLog(instr);
1129     case kMathExp:
1130       return DoMathExp(instr);
1131     case kMathSqrt:
1132       return DoMathSqrt(instr);
1133     case kMathPowHalf:
1134       return DoMathPowHalf(instr);
1135     case kMathClz32:
1136       return DoMathClz32(instr);
1137     default:
1138       UNREACHABLE();
1139       return NULL;
1140   }
1141 }
1142
1143
1144 LInstruction* LChunkBuilder::DoMathFloor(HUnaryMathOperation* instr) {
1145   LOperand* input = UseRegister(instr->value());
1146   LMathFloor* result = new(zone()) LMathFloor(input);
1147   return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
1148 }
1149
1150
1151 LInstruction* LChunkBuilder::DoMathRound(HUnaryMathOperation* instr) {
1152   LOperand* input = UseRegister(instr->value());
1153   LOperand* temp = TempDoubleRegister();
1154   LMathRound* result = new(zone()) LMathRound(input, temp);
1155   return AssignEnvironment(DefineAsRegister(result));
1156 }
1157
1158
1159 LInstruction* LChunkBuilder::DoMathFround(HUnaryMathOperation* instr) {
1160   LOperand* input = UseRegister(instr->value());
1161   LMathFround* result = new (zone()) LMathFround(input);
1162   return DefineAsRegister(result);
1163 }
1164
1165
1166 LInstruction* LChunkBuilder::DoMathAbs(HUnaryMathOperation* instr) {
1167   Representation r = instr->value()->representation();
1168   LOperand* context = (r.IsDouble() || r.IsSmiOrInteger32())
1169       ? NULL
1170       : UseFixed(instr->context(), cp);
1171   LOperand* input = UseRegister(instr->value());
1172   LInstruction* result =
1173       DefineAsRegister(new(zone()) LMathAbs(context, input));
1174   if (!r.IsDouble() && !r.IsSmiOrInteger32()) result = AssignPointerMap(result);
1175   if (!r.IsDouble()) result = AssignEnvironment(result);
1176   return result;
1177 }
1178
1179
1180 LInstruction* LChunkBuilder::DoMathLog(HUnaryMathOperation* instr) {
1181   DCHECK(instr->representation().IsDouble());
1182   DCHECK(instr->value()->representation().IsDouble());
1183   LOperand* input = UseFixedDouble(instr->value(), d0);
1184   return MarkAsCall(DefineFixedDouble(new(zone()) LMathLog(input), d0), instr);
1185 }
1186
1187
1188 LInstruction* LChunkBuilder::DoMathClz32(HUnaryMathOperation* instr) {
1189   LOperand* input = UseRegisterAtStart(instr->value());
1190   LMathClz32* result = new(zone()) LMathClz32(input);
1191   return DefineAsRegister(result);
1192 }
1193
1194
1195 LInstruction* LChunkBuilder::DoMathExp(HUnaryMathOperation* instr) {
1196   DCHECK(instr->representation().IsDouble());
1197   DCHECK(instr->value()->representation().IsDouble());
1198   LOperand* input = UseRegister(instr->value());
1199   LOperand* temp1 = TempRegister();
1200   LOperand* temp2 = TempRegister();
1201   LOperand* double_temp = TempDoubleRegister();
1202   LMathExp* result = new(zone()) LMathExp(input, double_temp, temp1, temp2);
1203   return DefineAsRegister(result);
1204 }
1205
1206
1207 LInstruction* LChunkBuilder::DoMathSqrt(HUnaryMathOperation* instr) {
1208   LOperand* input = UseRegisterAtStart(instr->value());
1209   LMathSqrt* result = new(zone()) LMathSqrt(input);
1210   return DefineAsRegister(result);
1211 }
1212
1213
1214 LInstruction* LChunkBuilder::DoMathPowHalf(HUnaryMathOperation* instr) {
1215   LOperand* input = UseRegisterAtStart(instr->value());
1216   LMathPowHalf* result = new(zone()) LMathPowHalf(input);
1217   return DefineAsRegister(result);
1218 }
1219
1220
1221 LInstruction* LChunkBuilder::DoCallNew(HCallNew* instr) {
1222   LOperand* context = UseFixed(instr->context(), cp);
1223   LOperand* constructor = UseFixed(instr->constructor(), r1);
1224   LCallNew* result = new(zone()) LCallNew(context, constructor);
1225   return MarkAsCall(DefineFixed(result, r0), instr);
1226 }
1227
1228
1229 LInstruction* LChunkBuilder::DoCallNewArray(HCallNewArray* instr) {
1230   LOperand* context = UseFixed(instr->context(), cp);
1231   LOperand* constructor = UseFixed(instr->constructor(), r1);
1232   LCallNewArray* result = new(zone()) LCallNewArray(context, constructor);
1233   return MarkAsCall(DefineFixed(result, r0), instr);
1234 }
1235
1236
1237 LInstruction* LChunkBuilder::DoCallFunction(HCallFunction* instr) {
1238   LOperand* context = UseFixed(instr->context(), cp);
1239   LOperand* function = UseFixed(instr->function(), r1);
1240   LCallFunction* call = new(zone()) LCallFunction(context, function);
1241   return MarkAsCall(DefineFixed(call, r0), instr);
1242 }
1243
1244
1245 LInstruction* LChunkBuilder::DoCallRuntime(HCallRuntime* instr) {
1246   LOperand* context = UseFixed(instr->context(), cp);
1247   return MarkAsCall(DefineFixed(new(zone()) LCallRuntime(context), r0), instr);
1248 }
1249
1250
1251 LInstruction* LChunkBuilder::DoRor(HRor* instr) {
1252   return DoShift(Token::ROR, instr);
1253 }
1254
1255
1256 LInstruction* LChunkBuilder::DoShr(HShr* instr) {
1257   return DoShift(Token::SHR, instr);
1258 }
1259
1260
1261 LInstruction* LChunkBuilder::DoSar(HSar* instr) {
1262   return DoShift(Token::SAR, instr);
1263 }
1264
1265
1266 LInstruction* LChunkBuilder::DoShl(HShl* instr) {
1267   return DoShift(Token::SHL, instr);
1268 }
1269
1270
1271 LInstruction* LChunkBuilder::DoBitwise(HBitwise* instr) {
1272   if (instr->representation().IsSmiOrInteger32()) {
1273     DCHECK(instr->left()->representation().Equals(instr->representation()));
1274     DCHECK(instr->right()->representation().Equals(instr->representation()));
1275     DCHECK(instr->CheckFlag(HValue::kTruncatingToInt32));
1276
1277     LOperand* left = UseRegisterAtStart(instr->BetterLeftOperand());
1278     LOperand* right = UseOrConstantAtStart(instr->BetterRightOperand());
1279     return DefineAsRegister(new(zone()) LBitI(left, right));
1280   } else {
1281     return DoArithmeticT(instr->op(), instr);
1282   }
1283 }
1284
1285
1286 LInstruction* LChunkBuilder::DoDivByPowerOf2I(HDiv* instr) {
1287   DCHECK(instr->representation().IsSmiOrInteger32());
1288   DCHECK(instr->left()->representation().Equals(instr->representation()));
1289   DCHECK(instr->right()->representation().Equals(instr->representation()));
1290   LOperand* dividend = UseRegister(instr->left());
1291   int32_t divisor = instr->right()->GetInteger32Constant();
1292   LInstruction* result = DefineAsRegister(new(zone()) LDivByPowerOf2I(
1293           dividend, divisor));
1294   if ((instr->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) ||
1295       (instr->CheckFlag(HValue::kCanOverflow) && divisor == -1) ||
1296       (!instr->CheckFlag(HInstruction::kAllUsesTruncatingToInt32) &&
1297        divisor != 1 && divisor != -1)) {
1298     result = AssignEnvironment(result);
1299   }
1300   return result;
1301 }
1302
1303
1304 LInstruction* LChunkBuilder::DoDivByConstI(HDiv* instr) {
1305   DCHECK(instr->representation().IsInteger32());
1306   DCHECK(instr->left()->representation().Equals(instr->representation()));
1307   DCHECK(instr->right()->representation().Equals(instr->representation()));
1308   LOperand* dividend = UseRegister(instr->left());
1309   int32_t divisor = instr->right()->GetInteger32Constant();
1310   LInstruction* result = DefineAsRegister(new(zone()) LDivByConstI(
1311           dividend, divisor));
1312   if (divisor == 0 ||
1313       (instr->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) ||
1314       !instr->CheckFlag(HInstruction::kAllUsesTruncatingToInt32)) {
1315     result = AssignEnvironment(result);
1316   }
1317   return result;
1318 }
1319
1320
1321 LInstruction* LChunkBuilder::DoDivI(HDiv* instr) {
1322   DCHECK(instr->representation().IsSmiOrInteger32());
1323   DCHECK(instr->left()->representation().Equals(instr->representation()));
1324   DCHECK(instr->right()->representation().Equals(instr->representation()));
1325   LOperand* dividend = UseRegister(instr->left());
1326   LOperand* divisor = UseRegister(instr->right());
1327   LOperand* temp =
1328       CpuFeatures::IsSupported(SUDIV) ? NULL : TempDoubleRegister();
1329   LInstruction* result =
1330       DefineAsRegister(new(zone()) LDivI(dividend, divisor, temp));
1331   if (instr->CheckFlag(HValue::kCanBeDivByZero) ||
1332       instr->CheckFlag(HValue::kBailoutOnMinusZero) ||
1333       (instr->CheckFlag(HValue::kCanOverflow) &&
1334        (!CpuFeatures::IsSupported(SUDIV) ||
1335         !instr->CheckFlag(HValue::kAllUsesTruncatingToInt32))) ||
1336       (!instr->IsMathFloorOfDiv() &&
1337        !instr->CheckFlag(HValue::kAllUsesTruncatingToInt32))) {
1338     result = AssignEnvironment(result);
1339   }
1340   return result;
1341 }
1342
1343
1344 LInstruction* LChunkBuilder::DoDiv(HDiv* instr) {
1345   if (instr->representation().IsSmiOrInteger32()) {
1346     if (instr->RightIsPowerOf2()) {
1347       return DoDivByPowerOf2I(instr);
1348     } else if (instr->right()->IsConstant()) {
1349       return DoDivByConstI(instr);
1350     } else {
1351       return DoDivI(instr);
1352     }
1353   } else if (instr->representation().IsDouble()) {
1354     return DoArithmeticD(Token::DIV, instr);
1355   } else {
1356     return DoArithmeticT(Token::DIV, instr);
1357   }
1358 }
1359
1360
1361 LInstruction* LChunkBuilder::DoFlooringDivByPowerOf2I(HMathFloorOfDiv* instr) {
1362   LOperand* dividend = UseRegisterAtStart(instr->left());
1363   int32_t divisor = instr->right()->GetInteger32Constant();
1364   LInstruction* result = DefineAsRegister(new(zone()) LFlooringDivByPowerOf2I(
1365           dividend, divisor));
1366   if ((instr->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) ||
1367       (instr->CheckFlag(HValue::kLeftCanBeMinInt) && divisor == -1)) {
1368     result = AssignEnvironment(result);
1369   }
1370   return result;
1371 }
1372
1373
1374 LInstruction* LChunkBuilder::DoFlooringDivByConstI(HMathFloorOfDiv* instr) {
1375   DCHECK(instr->representation().IsInteger32());
1376   DCHECK(instr->left()->representation().Equals(instr->representation()));
1377   DCHECK(instr->right()->representation().Equals(instr->representation()));
1378   LOperand* dividend = UseRegister(instr->left());
1379   int32_t divisor = instr->right()->GetInteger32Constant();
1380   LOperand* temp =
1381       ((divisor > 0 && !instr->CheckFlag(HValue::kLeftCanBeNegative)) ||
1382        (divisor < 0 && !instr->CheckFlag(HValue::kLeftCanBePositive))) ?
1383       NULL : TempRegister();
1384   LInstruction* result = DefineAsRegister(
1385       new(zone()) LFlooringDivByConstI(dividend, divisor, temp));
1386   if (divisor == 0 ||
1387       (instr->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0)) {
1388     result = AssignEnvironment(result);
1389   }
1390   return result;
1391 }
1392
1393
1394 LInstruction* LChunkBuilder::DoFlooringDivI(HMathFloorOfDiv* instr) {
1395   DCHECK(instr->representation().IsSmiOrInteger32());
1396   DCHECK(instr->left()->representation().Equals(instr->representation()));
1397   DCHECK(instr->right()->representation().Equals(instr->representation()));
1398   LOperand* dividend = UseRegister(instr->left());
1399   LOperand* divisor = UseRegister(instr->right());
1400   LOperand* temp =
1401       CpuFeatures::IsSupported(SUDIV) ? NULL : TempDoubleRegister();
1402   LFlooringDivI* div = new(zone()) LFlooringDivI(dividend, divisor, temp);
1403   return AssignEnvironment(DefineAsRegister(div));
1404 }
1405
1406
1407 LInstruction* LChunkBuilder::DoMathFloorOfDiv(HMathFloorOfDiv* instr) {
1408   if (instr->RightIsPowerOf2()) {
1409     return DoFlooringDivByPowerOf2I(instr);
1410   } else if (instr->right()->IsConstant()) {
1411     return DoFlooringDivByConstI(instr);
1412   } else {
1413     return DoFlooringDivI(instr);
1414   }
1415 }
1416
1417
1418 LInstruction* LChunkBuilder::DoModByPowerOf2I(HMod* instr) {
1419   DCHECK(instr->representation().IsSmiOrInteger32());
1420   DCHECK(instr->left()->representation().Equals(instr->representation()));
1421   DCHECK(instr->right()->representation().Equals(instr->representation()));
1422   LOperand* dividend = UseRegisterAtStart(instr->left());
1423   int32_t divisor = instr->right()->GetInteger32Constant();
1424   LInstruction* result = DefineSameAsFirst(new(zone()) LModByPowerOf2I(
1425           dividend, divisor));
1426   if (instr->CheckFlag(HValue::kLeftCanBeNegative) &&
1427       instr->CheckFlag(HValue::kBailoutOnMinusZero)) {
1428     result = AssignEnvironment(result);
1429   }
1430   return result;
1431 }
1432
1433
1434 LInstruction* LChunkBuilder::DoModByConstI(HMod* instr) {
1435   DCHECK(instr->representation().IsSmiOrInteger32());
1436   DCHECK(instr->left()->representation().Equals(instr->representation()));
1437   DCHECK(instr->right()->representation().Equals(instr->representation()));
1438   LOperand* dividend = UseRegister(instr->left());
1439   int32_t divisor = instr->right()->GetInteger32Constant();
1440   LInstruction* result = DefineAsRegister(new(zone()) LModByConstI(
1441           dividend, divisor));
1442   if (divisor == 0 || instr->CheckFlag(HValue::kBailoutOnMinusZero)) {
1443     result = AssignEnvironment(result);
1444   }
1445   return result;
1446 }
1447
1448
1449 LInstruction* LChunkBuilder::DoModI(HMod* instr) {
1450   DCHECK(instr->representation().IsSmiOrInteger32());
1451   DCHECK(instr->left()->representation().Equals(instr->representation()));
1452   DCHECK(instr->right()->representation().Equals(instr->representation()));
1453   LOperand* dividend = UseRegister(instr->left());
1454   LOperand* divisor = UseRegister(instr->right());
1455   LOperand* temp =
1456       CpuFeatures::IsSupported(SUDIV) ? NULL : TempDoubleRegister();
1457   LOperand* temp2 =
1458       CpuFeatures::IsSupported(SUDIV) ? NULL : TempDoubleRegister();
1459   LInstruction* result = DefineAsRegister(new(zone()) LModI(
1460           dividend, divisor, temp, temp2));
1461   if (instr->CheckFlag(HValue::kCanBeDivByZero) ||
1462       instr->CheckFlag(HValue::kBailoutOnMinusZero)) {
1463     result = AssignEnvironment(result);
1464   }
1465   return result;
1466 }
1467
1468
1469 LInstruction* LChunkBuilder::DoMod(HMod* instr) {
1470   if (instr->representation().IsSmiOrInteger32()) {
1471     if (instr->RightIsPowerOf2()) {
1472       return DoModByPowerOf2I(instr);
1473     } else if (instr->right()->IsConstant()) {
1474       return DoModByConstI(instr);
1475     } else {
1476       return DoModI(instr);
1477     }
1478   } else if (instr->representation().IsDouble()) {
1479     return DoArithmeticD(Token::MOD, instr);
1480   } else {
1481     return DoArithmeticT(Token::MOD, instr);
1482   }
1483 }
1484
1485
1486 LInstruction* LChunkBuilder::DoMul(HMul* instr) {
1487   if (instr->representation().IsSmiOrInteger32()) {
1488     DCHECK(instr->left()->representation().Equals(instr->representation()));
1489     DCHECK(instr->right()->representation().Equals(instr->representation()));
1490     HValue* left = instr->BetterLeftOperand();
1491     HValue* right = instr->BetterRightOperand();
1492     LOperand* left_op;
1493     LOperand* right_op;
1494     bool can_overflow = instr->CheckFlag(HValue::kCanOverflow);
1495     bool bailout_on_minus_zero = instr->CheckFlag(HValue::kBailoutOnMinusZero);
1496
1497     if (right->IsConstant()) {
1498       HConstant* constant = HConstant::cast(right);
1499       int32_t constant_value = constant->Integer32Value();
1500       // Constants -1, 0 and 1 can be optimized if the result can overflow.
1501       // For other constants, it can be optimized only without overflow.
1502       if (!can_overflow || ((constant_value >= -1) && (constant_value <= 1))) {
1503         left_op = UseRegisterAtStart(left);
1504         right_op = UseConstant(right);
1505       } else {
1506         if (bailout_on_minus_zero) {
1507           left_op = UseRegister(left);
1508         } else {
1509           left_op = UseRegisterAtStart(left);
1510         }
1511         right_op = UseRegister(right);
1512       }
1513     } else {
1514       if (bailout_on_minus_zero) {
1515         left_op = UseRegister(left);
1516       } else {
1517         left_op = UseRegisterAtStart(left);
1518       }
1519       right_op = UseRegister(right);
1520     }
1521     LMulI* mul = new(zone()) LMulI(left_op, right_op);
1522     if (can_overflow || bailout_on_minus_zero) {
1523       AssignEnvironment(mul);
1524     }
1525     return DefineAsRegister(mul);
1526
1527   } else if (instr->representation().IsDouble()) {
1528     if (instr->HasOneUse() && (instr->uses().value()->IsAdd() ||
1529                                instr->uses().value()->IsSub())) {
1530       HBinaryOperation* use = HBinaryOperation::cast(instr->uses().value());
1531
1532       if (use->IsAdd() && instr == use->left()) {
1533         // This mul is the lhs of an add. The add and mul will be folded into a
1534         // multiply-add in DoAdd.
1535         return NULL;
1536       }
1537       if (instr == use->right() && use->IsAdd() && !use->left()->IsMul()) {
1538         // This mul is the rhs of an add, where the lhs is not another mul.
1539         // The add and mul will be folded into a multiply-add in DoAdd.
1540         return NULL;
1541       }
1542       if (instr == use->right() && use->IsSub()) {
1543         // This mul is the rhs of a sub. The sub and mul will be folded into a
1544         // multiply-sub in DoSub.
1545         return NULL;
1546       }
1547     }
1548
1549     return DoArithmeticD(Token::MUL, instr);
1550   } else {
1551     return DoArithmeticT(Token::MUL, instr);
1552   }
1553 }
1554
1555
1556 LInstruction* LChunkBuilder::DoSub(HSub* instr) {
1557   if (instr->representation().IsSmiOrInteger32()) {
1558     DCHECK(instr->left()->representation().Equals(instr->representation()));
1559     DCHECK(instr->right()->representation().Equals(instr->representation()));
1560
1561     if (instr->left()->IsConstant()) {
1562       // If lhs is constant, do reverse subtraction instead.
1563       return DoRSub(instr);
1564     }
1565
1566     LOperand* left = UseRegisterAtStart(instr->left());
1567     LOperand* right = UseOrConstantAtStart(instr->right());
1568     LSubI* sub = new(zone()) LSubI(left, right);
1569     LInstruction* result = DefineAsRegister(sub);
1570     if (instr->CheckFlag(HValue::kCanOverflow)) {
1571       result = AssignEnvironment(result);
1572     }
1573     return result;
1574   } else if (instr->representation().IsDouble()) {
1575     if (instr->right()->IsMul() && instr->right()->HasOneUse()) {
1576       return DoMultiplySub(instr->left(), HMul::cast(instr->right()));
1577     }
1578
1579     return DoArithmeticD(Token::SUB, instr);
1580   } else {
1581     return DoArithmeticT(Token::SUB, instr);
1582   }
1583 }
1584
1585
1586 LInstruction* LChunkBuilder::DoRSub(HSub* instr) {
1587   DCHECK(instr->representation().IsSmiOrInteger32());
1588   DCHECK(instr->left()->representation().Equals(instr->representation()));
1589   DCHECK(instr->right()->representation().Equals(instr->representation()));
1590
1591   // Note: The lhs of the subtraction becomes the rhs of the
1592   // reverse-subtraction.
1593   LOperand* left = UseRegisterAtStart(instr->right());
1594   LOperand* right = UseOrConstantAtStart(instr->left());
1595   LRSubI* rsb = new(zone()) LRSubI(left, right);
1596   LInstruction* result = DefineAsRegister(rsb);
1597   if (instr->CheckFlag(HValue::kCanOverflow)) {
1598     result = AssignEnvironment(result);
1599   }
1600   return result;
1601 }
1602
1603
1604 LInstruction* LChunkBuilder::DoMultiplyAdd(HMul* mul, HValue* addend) {
1605   LOperand* multiplier_op = UseRegisterAtStart(mul->left());
1606   LOperand* multiplicand_op = UseRegisterAtStart(mul->right());
1607   LOperand* addend_op = UseRegisterAtStart(addend);
1608   return DefineSameAsFirst(new(zone()) LMultiplyAddD(addend_op, multiplier_op,
1609                                                      multiplicand_op));
1610 }
1611
1612
1613 LInstruction* LChunkBuilder::DoMultiplySub(HValue* minuend, HMul* mul) {
1614   LOperand* minuend_op = UseRegisterAtStart(minuend);
1615   LOperand* multiplier_op = UseRegisterAtStart(mul->left());
1616   LOperand* multiplicand_op = UseRegisterAtStart(mul->right());
1617
1618   return DefineSameAsFirst(new(zone()) LMultiplySubD(minuend_op,
1619                                                      multiplier_op,
1620                                                      multiplicand_op));
1621 }
1622
1623
1624 LInstruction* LChunkBuilder::DoAdd(HAdd* instr) {
1625   if (instr->representation().IsSmiOrInteger32()) {
1626     DCHECK(instr->left()->representation().Equals(instr->representation()));
1627     DCHECK(instr->right()->representation().Equals(instr->representation()));
1628     LOperand* left = UseRegisterAtStart(instr->BetterLeftOperand());
1629     LOperand* right = UseOrConstantAtStart(instr->BetterRightOperand());
1630     LAddI* add = new(zone()) LAddI(left, right);
1631     LInstruction* result = DefineAsRegister(add);
1632     if (instr->CheckFlag(HValue::kCanOverflow)) {
1633       result = AssignEnvironment(result);
1634     }
1635     return result;
1636   } else if (instr->representation().IsExternal()) {
1637     DCHECK(instr->left()->representation().IsExternal());
1638     DCHECK(instr->right()->representation().IsInteger32());
1639     DCHECK(!instr->CheckFlag(HValue::kCanOverflow));
1640     LOperand* left = UseRegisterAtStart(instr->left());
1641     LOperand* right = UseOrConstantAtStart(instr->right());
1642     LAddI* add = new(zone()) LAddI(left, right);
1643     LInstruction* result = DefineAsRegister(add);
1644     return result;
1645   } else if (instr->representation().IsDouble()) {
1646     if (instr->left()->IsMul() && instr->left()->HasOneUse()) {
1647       return DoMultiplyAdd(HMul::cast(instr->left()), instr->right());
1648     }
1649
1650     if (instr->right()->IsMul() && instr->right()->HasOneUse()) {
1651       DCHECK(!instr->left()->IsMul() || !instr->left()->HasOneUse());
1652       return DoMultiplyAdd(HMul::cast(instr->right()), instr->left());
1653     }
1654
1655     return DoArithmeticD(Token::ADD, instr);
1656   } else {
1657     return DoArithmeticT(Token::ADD, instr);
1658   }
1659 }
1660
1661
1662 LInstruction* LChunkBuilder::DoMathMinMax(HMathMinMax* instr) {
1663   LOperand* left = NULL;
1664   LOperand* right = NULL;
1665   if (instr->representation().IsSmiOrInteger32()) {
1666     DCHECK(instr->left()->representation().Equals(instr->representation()));
1667     DCHECK(instr->right()->representation().Equals(instr->representation()));
1668     left = UseRegisterAtStart(instr->BetterLeftOperand());
1669     right = UseOrConstantAtStart(instr->BetterRightOperand());
1670   } else {
1671     DCHECK(instr->representation().IsDouble());
1672     DCHECK(instr->left()->representation().IsDouble());
1673     DCHECK(instr->right()->representation().IsDouble());
1674     left = UseRegisterAtStart(instr->left());
1675     right = UseRegisterAtStart(instr->right());
1676   }
1677   return DefineAsRegister(new(zone()) LMathMinMax(left, right));
1678 }
1679
1680
1681 LInstruction* LChunkBuilder::DoPower(HPower* instr) {
1682   DCHECK(instr->representation().IsDouble());
1683   // We call a C function for double power. It can't trigger a GC.
1684   // We need to use fixed result register for the call.
1685   Representation exponent_type = instr->right()->representation();
1686   DCHECK(instr->left()->representation().IsDouble());
1687   LOperand* left = UseFixedDouble(instr->left(), d0);
1688   LOperand* right =
1689       exponent_type.IsDouble()
1690           ? UseFixedDouble(instr->right(), d1)
1691           : UseFixed(instr->right(), MathPowTaggedDescriptor::exponent());
1692   LPower* result = new(zone()) LPower(left, right);
1693   return MarkAsCall(DefineFixedDouble(result, d2),
1694                     instr,
1695                     CAN_DEOPTIMIZE_EAGERLY);
1696 }
1697
1698
1699 LInstruction* LChunkBuilder::DoCompareGeneric(HCompareGeneric* instr) {
1700   DCHECK(instr->left()->representation().IsTagged());
1701   DCHECK(instr->right()->representation().IsTagged());
1702   LOperand* context = UseFixed(instr->context(), cp);
1703   LOperand* left = UseFixed(instr->left(), r1);
1704   LOperand* right = UseFixed(instr->right(), r0);
1705   LCmpT* result = new(zone()) LCmpT(context, left, right);
1706   return MarkAsCall(DefineFixed(result, r0), instr);
1707 }
1708
1709
1710 LInstruction* LChunkBuilder::DoCompareNumericAndBranch(
1711     HCompareNumericAndBranch* instr) {
1712   Representation r = instr->representation();
1713   if (r.IsSmiOrInteger32()) {
1714     DCHECK(instr->left()->representation().Equals(r));
1715     DCHECK(instr->right()->representation().Equals(r));
1716     LOperand* left = UseRegisterOrConstantAtStart(instr->left());
1717     LOperand* right = UseRegisterOrConstantAtStart(instr->right());
1718     return new(zone()) LCompareNumericAndBranch(left, right);
1719   } else {
1720     DCHECK(r.IsDouble());
1721     DCHECK(instr->left()->representation().IsDouble());
1722     DCHECK(instr->right()->representation().IsDouble());
1723     LOperand* left = UseRegisterAtStart(instr->left());
1724     LOperand* right = UseRegisterAtStart(instr->right());
1725     return new(zone()) LCompareNumericAndBranch(left, right);
1726   }
1727 }
1728
1729
1730 LInstruction* LChunkBuilder::DoCompareObjectEqAndBranch(
1731     HCompareObjectEqAndBranch* instr) {
1732   LOperand* left = UseRegisterAtStart(instr->left());
1733   LOperand* right = UseRegisterAtStart(instr->right());
1734   return new(zone()) LCmpObjectEqAndBranch(left, right);
1735 }
1736
1737
1738 LInstruction* LChunkBuilder::DoCompareHoleAndBranch(
1739     HCompareHoleAndBranch* instr) {
1740   LOperand* value = UseRegisterAtStart(instr->value());
1741   return new(zone()) LCmpHoleAndBranch(value);
1742 }
1743
1744
1745 LInstruction* LChunkBuilder::DoCompareMinusZeroAndBranch(
1746     HCompareMinusZeroAndBranch* instr) {
1747   LOperand* value = UseRegister(instr->value());
1748   LOperand* scratch = TempRegister();
1749   return new(zone()) LCompareMinusZeroAndBranch(value, scratch);
1750 }
1751
1752
1753 LInstruction* LChunkBuilder::DoIsObjectAndBranch(HIsObjectAndBranch* instr) {
1754   DCHECK(instr->value()->representation().IsTagged());
1755   LOperand* value = UseRegisterAtStart(instr->value());
1756   LOperand* temp = TempRegister();
1757   return new(zone()) LIsObjectAndBranch(value, temp);
1758 }
1759
1760
1761 LInstruction* LChunkBuilder::DoIsStringAndBranch(HIsStringAndBranch* instr) {
1762   DCHECK(instr->value()->representation().IsTagged());
1763   LOperand* value = UseRegisterAtStart(instr->value());
1764   LOperand* temp = TempRegister();
1765   return new(zone()) LIsStringAndBranch(value, temp);
1766 }
1767
1768
1769 LInstruction* LChunkBuilder::DoIsSmiAndBranch(HIsSmiAndBranch* instr) {
1770   DCHECK(instr->value()->representation().IsTagged());
1771   return new(zone()) LIsSmiAndBranch(Use(instr->value()));
1772 }
1773
1774
1775 LInstruction* LChunkBuilder::DoIsUndetectableAndBranch(
1776     HIsUndetectableAndBranch* instr) {
1777   DCHECK(instr->value()->representation().IsTagged());
1778   LOperand* value = UseRegisterAtStart(instr->value());
1779   return new(zone()) LIsUndetectableAndBranch(value, TempRegister());
1780 }
1781
1782
1783 LInstruction* LChunkBuilder::DoStringCompareAndBranch(
1784     HStringCompareAndBranch* instr) {
1785   DCHECK(instr->left()->representation().IsTagged());
1786   DCHECK(instr->right()->representation().IsTagged());
1787   LOperand* context = UseFixed(instr->context(), cp);
1788   LOperand* left = UseFixed(instr->left(), r1);
1789   LOperand* right = UseFixed(instr->right(), r0);
1790   LStringCompareAndBranch* result =
1791       new(zone()) LStringCompareAndBranch(context, left, right);
1792   return MarkAsCall(result, instr);
1793 }
1794
1795
1796 LInstruction* LChunkBuilder::DoHasInstanceTypeAndBranch(
1797     HHasInstanceTypeAndBranch* instr) {
1798   DCHECK(instr->value()->representation().IsTagged());
1799   LOperand* value = UseRegisterAtStart(instr->value());
1800   return new(zone()) LHasInstanceTypeAndBranch(value);
1801 }
1802
1803
1804 LInstruction* LChunkBuilder::DoGetCachedArrayIndex(
1805     HGetCachedArrayIndex* instr)  {
1806   DCHECK(instr->value()->representation().IsTagged());
1807   LOperand* value = UseRegisterAtStart(instr->value());
1808
1809   return DefineAsRegister(new(zone()) LGetCachedArrayIndex(value));
1810 }
1811
1812
1813 LInstruction* LChunkBuilder::DoHasCachedArrayIndexAndBranch(
1814     HHasCachedArrayIndexAndBranch* instr) {
1815   DCHECK(instr->value()->representation().IsTagged());
1816   return new(zone()) LHasCachedArrayIndexAndBranch(
1817       UseRegisterAtStart(instr->value()));
1818 }
1819
1820
1821 LInstruction* LChunkBuilder::DoClassOfTestAndBranch(
1822     HClassOfTestAndBranch* instr) {
1823   DCHECK(instr->value()->representation().IsTagged());
1824   LOperand* value = UseRegister(instr->value());
1825   return new(zone()) LClassOfTestAndBranch(value, TempRegister());
1826 }
1827
1828
1829 LInstruction* LChunkBuilder::DoMapEnumLength(HMapEnumLength* instr) {
1830   LOperand* map = UseRegisterAtStart(instr->value());
1831   return DefineAsRegister(new(zone()) LMapEnumLength(map));
1832 }
1833
1834
1835 LInstruction* LChunkBuilder::DoDateField(HDateField* instr) {
1836   LOperand* object = UseFixed(instr->value(), r0);
1837   LDateField* result =
1838       new(zone()) LDateField(object, FixedTemp(r1), instr->index());
1839   return MarkAsCall(DefineFixed(result, r0), instr, CAN_DEOPTIMIZE_EAGERLY);
1840 }
1841
1842
1843 LInstruction* LChunkBuilder::DoSeqStringGetChar(HSeqStringGetChar* instr) {
1844   LOperand* string = UseRegisterAtStart(instr->string());
1845   LOperand* index = UseRegisterOrConstantAtStart(instr->index());
1846   return DefineAsRegister(new(zone()) LSeqStringGetChar(string, index));
1847 }
1848
1849
1850 LInstruction* LChunkBuilder::DoSeqStringSetChar(HSeqStringSetChar* instr) {
1851   LOperand* string = UseRegisterAtStart(instr->string());
1852   LOperand* index = FLAG_debug_code
1853       ? UseRegisterAtStart(instr->index())
1854       : UseRegisterOrConstantAtStart(instr->index());
1855   LOperand* value = UseRegisterAtStart(instr->value());
1856   LOperand* context = FLAG_debug_code ? UseFixed(instr->context(), cp) : NULL;
1857   return new(zone()) LSeqStringSetChar(context, string, index, value);
1858 }
1859
1860
1861 LInstruction* LChunkBuilder::DoBoundsCheck(HBoundsCheck* instr) {
1862   if (!FLAG_debug_code && instr->skip_check()) return NULL;
1863   LOperand* index = UseRegisterOrConstantAtStart(instr->index());
1864   LOperand* length = !index->IsConstantOperand()
1865       ? UseRegisterOrConstantAtStart(instr->length())
1866       : UseRegisterAtStart(instr->length());
1867   LInstruction* result = new(zone()) LBoundsCheck(index, length);
1868   if (!FLAG_debug_code || !instr->skip_check()) {
1869     result = AssignEnvironment(result);
1870   }
1871   return result;
1872 }
1873
1874
1875 LInstruction* LChunkBuilder::DoBoundsCheckBaseIndexInformation(
1876     HBoundsCheckBaseIndexInformation* instr) {
1877   UNREACHABLE();
1878   return NULL;
1879 }
1880
1881
1882 LInstruction* LChunkBuilder::DoAbnormalExit(HAbnormalExit* instr) {
1883   // The control instruction marking the end of a block that completed
1884   // abruptly (e.g., threw an exception).  There is nothing specific to do.
1885   return NULL;
1886 }
1887
1888
1889 LInstruction* LChunkBuilder::DoUseConst(HUseConst* instr) {
1890   return NULL;
1891 }
1892
1893
1894 LInstruction* LChunkBuilder::DoForceRepresentation(HForceRepresentation* bad) {
1895   // All HForceRepresentation instructions should be eliminated in the
1896   // representation change phase of Hydrogen.
1897   UNREACHABLE();
1898   return NULL;
1899 }
1900
1901
1902 LInstruction* LChunkBuilder::DoChange(HChange* instr) {
1903   Representation from = instr->from();
1904   Representation to = instr->to();
1905   HValue* val = instr->value();
1906   if (from.IsSmi()) {
1907     if (to.IsTagged()) {
1908       LOperand* value = UseRegister(val);
1909       return DefineSameAsFirst(new(zone()) LDummyUse(value));
1910     }
1911     from = Representation::Tagged();
1912   }
1913   if (from.IsTagged()) {
1914     if (to.IsDouble()) {
1915       LOperand* value = UseRegister(val);
1916       LInstruction* result = DefineAsRegister(new(zone()) LNumberUntagD(value));
1917       if (!val->representation().IsSmi()) result = AssignEnvironment(result);
1918       return result;
1919     } else if (to.IsSmi()) {
1920       LOperand* value = UseRegister(val);
1921       if (val->type().IsSmi()) {
1922         return DefineSameAsFirst(new(zone()) LDummyUse(value));
1923       }
1924       return AssignEnvironment(DefineSameAsFirst(new(zone()) LCheckSmi(value)));
1925     } else {
1926       DCHECK(to.IsInteger32());
1927       if (val->type().IsSmi() || val->representation().IsSmi()) {
1928         LOperand* value = UseRegisterAtStart(val);
1929         return DefineAsRegister(new(zone()) LSmiUntag(value, false));
1930       } else {
1931         LOperand* value = UseRegister(val);
1932         LOperand* temp1 = TempRegister();
1933         LOperand* temp2 = TempDoubleRegister();
1934         LInstruction* result =
1935             DefineSameAsFirst(new(zone()) LTaggedToI(value, temp1, temp2));
1936         if (!val->representation().IsSmi()) result = AssignEnvironment(result);
1937         return result;
1938       }
1939     }
1940   } else if (from.IsDouble()) {
1941     if (to.IsTagged()) {
1942       info()->MarkAsDeferredCalling();
1943       LOperand* value = UseRegister(val);
1944       LOperand* temp1 = TempRegister();
1945       LOperand* temp2 = TempRegister();
1946       LUnallocated* result_temp = TempRegister();
1947       LNumberTagD* result = new(zone()) LNumberTagD(value, temp1, temp2);
1948       return AssignPointerMap(Define(result, result_temp));
1949     } else if (to.IsSmi()) {
1950       LOperand* value = UseRegister(val);
1951       return AssignEnvironment(
1952           DefineAsRegister(new(zone()) LDoubleToSmi(value)));
1953     } else {
1954       DCHECK(to.IsInteger32());
1955       LOperand* value = UseRegister(val);
1956       LInstruction* result = DefineAsRegister(new(zone()) LDoubleToI(value));
1957       if (!instr->CanTruncateToInt32()) result = AssignEnvironment(result);
1958       return result;
1959     }
1960   } else if (from.IsInteger32()) {
1961     info()->MarkAsDeferredCalling();
1962     if (to.IsTagged()) {
1963       if (!instr->CheckFlag(HValue::kCanOverflow)) {
1964         LOperand* value = UseRegisterAtStart(val);
1965         return DefineAsRegister(new(zone()) LSmiTag(value));
1966       } else if (val->CheckFlag(HInstruction::kUint32)) {
1967         LOperand* value = UseRegisterAtStart(val);
1968         LOperand* temp1 = TempRegister();
1969         LOperand* temp2 = TempRegister();
1970         LNumberTagU* result = new(zone()) LNumberTagU(value, temp1, temp2);
1971         return AssignPointerMap(DefineAsRegister(result));
1972       } else {
1973         LOperand* value = UseRegisterAtStart(val);
1974         LOperand* temp1 = TempRegister();
1975         LOperand* temp2 = TempRegister();
1976         LNumberTagI* result = new(zone()) LNumberTagI(value, temp1, temp2);
1977         return AssignPointerMap(DefineAsRegister(result));
1978       }
1979     } else if (to.IsSmi()) {
1980       LOperand* value = UseRegister(val);
1981       LInstruction* result = DefineAsRegister(new(zone()) LSmiTag(value));
1982       if (instr->CheckFlag(HValue::kCanOverflow)) {
1983         result = AssignEnvironment(result);
1984       }
1985       return result;
1986     } else {
1987       DCHECK(to.IsDouble());
1988       if (val->CheckFlag(HInstruction::kUint32)) {
1989         return DefineAsRegister(new(zone()) LUint32ToDouble(UseRegister(val)));
1990       } else {
1991         return DefineAsRegister(new(zone()) LInteger32ToDouble(Use(val)));
1992       }
1993     }
1994   }
1995   UNREACHABLE();
1996   return NULL;
1997 }
1998
1999
2000 LInstruction* LChunkBuilder::DoCheckHeapObject(HCheckHeapObject* instr) {
2001   LOperand* value = UseRegisterAtStart(instr->value());
2002   LInstruction* result = new(zone()) LCheckNonSmi(value);
2003   if (!instr->value()->type().IsHeapObject()) {
2004     result = AssignEnvironment(result);
2005   }
2006   return result;
2007 }
2008
2009
2010 LInstruction* LChunkBuilder::DoCheckSmi(HCheckSmi* instr) {
2011   LOperand* value = UseRegisterAtStart(instr->value());
2012   return AssignEnvironment(new(zone()) LCheckSmi(value));
2013 }
2014
2015
2016 LInstruction* LChunkBuilder::DoCheckInstanceType(HCheckInstanceType* instr) {
2017   LOperand* value = UseRegisterAtStart(instr->value());
2018   LInstruction* result = new(zone()) LCheckInstanceType(value);
2019   return AssignEnvironment(result);
2020 }
2021
2022
2023 LInstruction* LChunkBuilder::DoCheckValue(HCheckValue* instr) {
2024   LOperand* value = UseRegisterAtStart(instr->value());
2025   return AssignEnvironment(new(zone()) LCheckValue(value));
2026 }
2027
2028
2029 LInstruction* LChunkBuilder::DoCheckMaps(HCheckMaps* instr) {
2030   if (instr->IsStabilityCheck()) return new(zone()) LCheckMaps;
2031   LOperand* value = UseRegisterAtStart(instr->value());
2032   LInstruction* result = AssignEnvironment(new(zone()) LCheckMaps(value));
2033   if (instr->HasMigrationTarget()) {
2034     info()->MarkAsDeferredCalling();
2035     result = AssignPointerMap(result);
2036   }
2037   return result;
2038 }
2039
2040
2041 LInstruction* LChunkBuilder::DoClampToUint8(HClampToUint8* instr) {
2042   HValue* value = instr->value();
2043   Representation input_rep = value->representation();
2044   LOperand* reg = UseRegister(value);
2045   if (input_rep.IsDouble()) {
2046     return DefineAsRegister(new(zone()) LClampDToUint8(reg));
2047   } else if (input_rep.IsInteger32()) {
2048     return DefineAsRegister(new(zone()) LClampIToUint8(reg));
2049   } else {
2050     DCHECK(input_rep.IsSmiOrTagged());
2051     // Register allocator doesn't (yet) support allocation of double
2052     // temps. Reserve d1 explicitly.
2053     LClampTToUint8* result =
2054         new(zone()) LClampTToUint8(reg, TempDoubleRegister());
2055     return AssignEnvironment(DefineAsRegister(result));
2056   }
2057 }
2058
2059
2060 LInstruction* LChunkBuilder::DoDoubleBits(HDoubleBits* instr) {
2061   HValue* value = instr->value();
2062   DCHECK(value->representation().IsDouble());
2063   return DefineAsRegister(new(zone()) LDoubleBits(UseRegister(value)));
2064 }
2065
2066
2067 LInstruction* LChunkBuilder::DoConstructDouble(HConstructDouble* instr) {
2068   LOperand* lo = UseRegister(instr->lo());
2069   LOperand* hi = UseRegister(instr->hi());
2070   return DefineAsRegister(new(zone()) LConstructDouble(hi, lo));
2071 }
2072
2073
2074 LInstruction* LChunkBuilder::DoReturn(HReturn* instr) {
2075   LOperand* context = info()->IsStub()
2076       ? UseFixed(instr->context(), cp)
2077       : NULL;
2078   LOperand* parameter_count = UseRegisterOrConstant(instr->parameter_count());
2079   return new(zone()) LReturn(UseFixed(instr->value(), r0), context,
2080                              parameter_count);
2081 }
2082
2083
2084 LInstruction* LChunkBuilder::DoConstant(HConstant* instr) {
2085   Representation r = instr->representation();
2086   if (r.IsSmi()) {
2087     return DefineAsRegister(new(zone()) LConstantS);
2088   } else if (r.IsInteger32()) {
2089     return DefineAsRegister(new(zone()) LConstantI);
2090   } else if (r.IsDouble()) {
2091     return DefineAsRegister(new(zone()) LConstantD);
2092   } else if (r.IsExternal()) {
2093     return DefineAsRegister(new(zone()) LConstantE);
2094   } else if (r.IsTagged()) {
2095     return DefineAsRegister(new(zone()) LConstantT);
2096   } else {
2097     UNREACHABLE();
2098     return NULL;
2099   }
2100 }
2101
2102
2103 LInstruction* LChunkBuilder::DoLoadGlobalCell(HLoadGlobalCell* instr) {
2104   LLoadGlobalCell* result = new(zone()) LLoadGlobalCell;
2105   return instr->RequiresHoleCheck()
2106       ? AssignEnvironment(DefineAsRegister(result))
2107       : DefineAsRegister(result);
2108 }
2109
2110
2111 LInstruction* LChunkBuilder::DoLoadGlobalGeneric(HLoadGlobalGeneric* instr) {
2112   LOperand* context = UseFixed(instr->context(), cp);
2113   LOperand* global_object =
2114       UseFixed(instr->global_object(), LoadDescriptor::ReceiverRegister());
2115   LOperand* vector = NULL;
2116   if (FLAG_vector_ics) {
2117     vector = FixedTemp(VectorLoadICDescriptor::VectorRegister());
2118   }
2119   LLoadGlobalGeneric* result =
2120       new(zone()) LLoadGlobalGeneric(context, global_object, vector);
2121   return MarkAsCall(DefineFixed(result, r0), instr);
2122 }
2123
2124
2125 LInstruction* LChunkBuilder::DoStoreGlobalCell(HStoreGlobalCell* instr) {
2126   LOperand* value = UseRegister(instr->value());
2127   // Use a temp to check the value in the cell in the case where we perform
2128   // a hole check.
2129   return instr->RequiresHoleCheck()
2130       ? AssignEnvironment(new(zone()) LStoreGlobalCell(value, TempRegister()))
2131       : new(zone()) LStoreGlobalCell(value, NULL);
2132 }
2133
2134
2135 LInstruction* LChunkBuilder::DoLoadContextSlot(HLoadContextSlot* instr) {
2136   LOperand* context = UseRegisterAtStart(instr->value());
2137   LInstruction* result =
2138       DefineAsRegister(new(zone()) LLoadContextSlot(context));
2139   if (instr->RequiresHoleCheck() && instr->DeoptimizesOnHole()) {
2140     result = AssignEnvironment(result);
2141   }
2142   return result;
2143 }
2144
2145
2146 LInstruction* LChunkBuilder::DoStoreContextSlot(HStoreContextSlot* instr) {
2147   LOperand* context;
2148   LOperand* value;
2149   if (instr->NeedsWriteBarrier()) {
2150     context = UseTempRegister(instr->context());
2151     value = UseTempRegister(instr->value());
2152   } else {
2153     context = UseRegister(instr->context());
2154     value = UseRegister(instr->value());
2155   }
2156   LInstruction* result = new(zone()) LStoreContextSlot(context, value);
2157   if (instr->RequiresHoleCheck() && instr->DeoptimizesOnHole()) {
2158     result = AssignEnvironment(result);
2159   }
2160   return result;
2161 }
2162
2163
2164 LInstruction* LChunkBuilder::DoLoadNamedField(HLoadNamedField* instr) {
2165   LOperand* obj = UseRegisterAtStart(instr->object());
2166   return DefineAsRegister(new(zone()) LLoadNamedField(obj));
2167 }
2168
2169
2170 LInstruction* LChunkBuilder::DoLoadNamedGeneric(HLoadNamedGeneric* instr) {
2171   LOperand* context = UseFixed(instr->context(), cp);
2172   LOperand* object =
2173       UseFixed(instr->object(), LoadDescriptor::ReceiverRegister());
2174   LOperand* vector = NULL;
2175   if (FLAG_vector_ics) {
2176     vector = FixedTemp(VectorLoadICDescriptor::VectorRegister());
2177   }
2178
2179   LInstruction* result =
2180       DefineFixed(new(zone()) LLoadNamedGeneric(context, object, vector), r0);
2181   return MarkAsCall(result, instr);
2182 }
2183
2184
2185 LInstruction* LChunkBuilder::DoLoadFunctionPrototype(
2186     HLoadFunctionPrototype* instr) {
2187   return AssignEnvironment(DefineAsRegister(
2188       new(zone()) LLoadFunctionPrototype(UseRegister(instr->function()))));
2189 }
2190
2191
2192 LInstruction* LChunkBuilder::DoLoadRoot(HLoadRoot* instr) {
2193   return DefineAsRegister(new(zone()) LLoadRoot);
2194 }
2195
2196
2197 LInstruction* LChunkBuilder::DoLoadKeyed(HLoadKeyed* instr) {
2198   DCHECK(instr->key()->representation().IsSmiOrInteger32());
2199   ElementsKind elements_kind = instr->elements_kind();
2200   LOperand* key = UseRegisterOrConstantAtStart(instr->key());
2201   LInstruction* result = NULL;
2202
2203   if (!instr->is_typed_elements()) {
2204     LOperand* obj = NULL;
2205     if (instr->representation().IsDouble()) {
2206       obj = UseRegister(instr->elements());
2207     } else {
2208       DCHECK(instr->representation().IsSmiOrTagged());
2209       obj = UseRegisterAtStart(instr->elements());
2210     }
2211     result = DefineAsRegister(new(zone()) LLoadKeyed(obj, key));
2212   } else {
2213     DCHECK(
2214         (instr->representation().IsInteger32() &&
2215          !IsDoubleOrFloatElementsKind(elements_kind)) ||
2216         (instr->representation().IsDouble() &&
2217          IsDoubleOrFloatElementsKind(elements_kind)));
2218     LOperand* backing_store = UseRegister(instr->elements());
2219     result = DefineAsRegister(new(zone()) LLoadKeyed(backing_store, key));
2220   }
2221
2222   if ((instr->is_external() || instr->is_fixed_typed_array()) ?
2223       // see LCodeGen::DoLoadKeyedExternalArray
2224       ((elements_kind == EXTERNAL_UINT32_ELEMENTS ||
2225         elements_kind == UINT32_ELEMENTS) &&
2226        !instr->CheckFlag(HInstruction::kUint32)) :
2227       // see LCodeGen::DoLoadKeyedFixedDoubleArray and
2228       // LCodeGen::DoLoadKeyedFixedArray
2229       instr->RequiresHoleCheck()) {
2230     result = AssignEnvironment(result);
2231   }
2232   return result;
2233 }
2234
2235
2236 LInstruction* LChunkBuilder::DoLoadKeyedGeneric(HLoadKeyedGeneric* instr) {
2237   LOperand* context = UseFixed(instr->context(), cp);
2238   LOperand* object =
2239       UseFixed(instr->object(), LoadDescriptor::ReceiverRegister());
2240   LOperand* key = UseFixed(instr->key(), LoadDescriptor::NameRegister());
2241   LOperand* vector = NULL;
2242   if (FLAG_vector_ics) {
2243     vector = FixedTemp(VectorLoadICDescriptor::VectorRegister());
2244   }
2245
2246   LInstruction* result =
2247       DefineFixed(new(zone()) LLoadKeyedGeneric(context, object, key, vector),
2248                   r0);
2249   return MarkAsCall(result, instr);
2250 }
2251
2252
2253 LInstruction* LChunkBuilder::DoStoreKeyed(HStoreKeyed* instr) {
2254   if (!instr->is_typed_elements()) {
2255     DCHECK(instr->elements()->representation().IsTagged());
2256     bool needs_write_barrier = instr->NeedsWriteBarrier();
2257     LOperand* object = NULL;
2258     LOperand* key = NULL;
2259     LOperand* val = NULL;
2260
2261     if (instr->value()->representation().IsDouble()) {
2262       object = UseRegisterAtStart(instr->elements());
2263       val = UseRegister(instr->value());
2264       key = UseRegisterOrConstantAtStart(instr->key());
2265     } else {
2266       DCHECK(instr->value()->representation().IsSmiOrTagged());
2267       if (needs_write_barrier) {
2268         object = UseTempRegister(instr->elements());
2269         val = UseTempRegister(instr->value());
2270         key = UseTempRegister(instr->key());
2271       } else {
2272         object = UseRegisterAtStart(instr->elements());
2273         val = UseRegisterAtStart(instr->value());
2274         key = UseRegisterOrConstantAtStart(instr->key());
2275       }
2276     }
2277
2278     return new(zone()) LStoreKeyed(object, key, val);
2279   }
2280
2281   DCHECK(
2282       (instr->value()->representation().IsInteger32() &&
2283        !IsDoubleOrFloatElementsKind(instr->elements_kind())) ||
2284       (instr->value()->representation().IsDouble() &&
2285        IsDoubleOrFloatElementsKind(instr->elements_kind())));
2286   DCHECK((instr->is_fixed_typed_array() &&
2287           instr->elements()->representation().IsTagged()) ||
2288          (instr->is_external() &&
2289           instr->elements()->representation().IsExternal()));
2290   LOperand* val = UseRegister(instr->value());
2291   LOperand* key = UseRegisterOrConstantAtStart(instr->key());
2292   LOperand* backing_store = UseRegister(instr->elements());
2293   return new(zone()) LStoreKeyed(backing_store, key, val);
2294 }
2295
2296
2297 LInstruction* LChunkBuilder::DoStoreKeyedGeneric(HStoreKeyedGeneric* instr) {
2298   LOperand* context = UseFixed(instr->context(), cp);
2299   LOperand* obj =
2300       UseFixed(instr->object(), StoreDescriptor::ReceiverRegister());
2301   LOperand* key = UseFixed(instr->key(), StoreDescriptor::NameRegister());
2302   LOperand* val = UseFixed(instr->value(), StoreDescriptor::ValueRegister());
2303
2304   DCHECK(instr->object()->representation().IsTagged());
2305   DCHECK(instr->key()->representation().IsTagged());
2306   DCHECK(instr->value()->representation().IsTagged());
2307
2308   return MarkAsCall(
2309       new(zone()) LStoreKeyedGeneric(context, obj, key, val), instr);
2310 }
2311
2312
2313 LInstruction* LChunkBuilder::DoTransitionElementsKind(
2314     HTransitionElementsKind* instr) {
2315   if (IsSimpleMapChangeTransition(instr->from_kind(), instr->to_kind())) {
2316     LOperand* object = UseRegister(instr->object());
2317     LOperand* new_map_reg = TempRegister();
2318     LTransitionElementsKind* result =
2319         new(zone()) LTransitionElementsKind(object, NULL, new_map_reg);
2320     return result;
2321   } else {
2322     LOperand* object = UseFixed(instr->object(), r0);
2323     LOperand* context = UseFixed(instr->context(), cp);
2324     LTransitionElementsKind* result =
2325         new(zone()) LTransitionElementsKind(object, context, NULL);
2326     return MarkAsCall(result, instr);
2327   }
2328 }
2329
2330
2331 LInstruction* LChunkBuilder::DoTrapAllocationMemento(
2332     HTrapAllocationMemento* instr) {
2333   LOperand* object = UseRegister(instr->object());
2334   LOperand* temp = TempRegister();
2335   LTrapAllocationMemento* result =
2336       new(zone()) LTrapAllocationMemento(object, temp);
2337   return AssignEnvironment(result);
2338 }
2339
2340
2341 LInstruction* LChunkBuilder::DoStoreNamedField(HStoreNamedField* instr) {
2342   bool is_in_object = instr->access().IsInobject();
2343   bool needs_write_barrier = instr->NeedsWriteBarrier();
2344   bool needs_write_barrier_for_map = instr->has_transition() &&
2345       instr->NeedsWriteBarrierForMap();
2346
2347   LOperand* obj;
2348   if (needs_write_barrier) {
2349     obj = is_in_object
2350         ? UseRegister(instr->object())
2351         : UseTempRegister(instr->object());
2352   } else {
2353     obj = needs_write_barrier_for_map
2354         ? UseRegister(instr->object())
2355         : UseRegisterAtStart(instr->object());
2356   }
2357
2358   LOperand* val;
2359   if (needs_write_barrier) {
2360     val = UseTempRegister(instr->value());
2361   } else if (instr->field_representation().IsDouble()) {
2362     val = UseRegisterAtStart(instr->value());
2363   } else {
2364     val = UseRegister(instr->value());
2365   }
2366
2367   // We need a temporary register for write barrier of the map field.
2368   LOperand* temp = needs_write_barrier_for_map ? TempRegister() : NULL;
2369
2370   return new(zone()) LStoreNamedField(obj, val, temp);
2371 }
2372
2373
2374 LInstruction* LChunkBuilder::DoStoreNamedGeneric(HStoreNamedGeneric* instr) {
2375   LOperand* context = UseFixed(instr->context(), cp);
2376   LOperand* obj =
2377       UseFixed(instr->object(), StoreDescriptor::ReceiverRegister());
2378   LOperand* val = UseFixed(instr->value(), StoreDescriptor::ValueRegister());
2379
2380   LInstruction* result = new(zone()) LStoreNamedGeneric(context, obj, val);
2381   return MarkAsCall(result, instr);
2382 }
2383
2384
2385 LInstruction* LChunkBuilder::DoStringAdd(HStringAdd* instr) {
2386   LOperand* context = UseFixed(instr->context(), cp);
2387   LOperand* left = UseFixed(instr->left(), r1);
2388   LOperand* right = UseFixed(instr->right(), r0);
2389   return MarkAsCall(
2390       DefineFixed(new(zone()) LStringAdd(context, left, right), r0),
2391       instr);
2392 }
2393
2394
2395 LInstruction* LChunkBuilder::DoStringCharCodeAt(HStringCharCodeAt* instr) {
2396   LOperand* string = UseTempRegister(instr->string());
2397   LOperand* index = UseTempRegister(instr->index());
2398   LOperand* context = UseAny(instr->context());
2399   LStringCharCodeAt* result =
2400       new(zone()) LStringCharCodeAt(context, string, index);
2401   return AssignPointerMap(DefineAsRegister(result));
2402 }
2403
2404
2405 LInstruction* LChunkBuilder::DoStringCharFromCode(HStringCharFromCode* instr) {
2406   LOperand* char_code = UseRegister(instr->value());
2407   LOperand* context = UseAny(instr->context());
2408   LStringCharFromCode* result =
2409       new(zone()) LStringCharFromCode(context, char_code);
2410   return AssignPointerMap(DefineAsRegister(result));
2411 }
2412
2413
2414 LInstruction* LChunkBuilder::DoAllocate(HAllocate* instr) {
2415   info()->MarkAsDeferredCalling();
2416   LOperand* context = UseAny(instr->context());
2417   LOperand* size = UseRegisterOrConstant(instr->size());
2418   LOperand* temp1 = TempRegister();
2419   LOperand* temp2 = TempRegister();
2420   LAllocate* result = new(zone()) LAllocate(context, size, temp1, temp2);
2421   return AssignPointerMap(DefineAsRegister(result));
2422 }
2423
2424
2425 LInstruction* LChunkBuilder::DoRegExpLiteral(HRegExpLiteral* instr) {
2426   LOperand* context = UseFixed(instr->context(), cp);
2427   return MarkAsCall(
2428       DefineFixed(new(zone()) LRegExpLiteral(context), r0), instr);
2429 }
2430
2431
2432 LInstruction* LChunkBuilder::DoFunctionLiteral(HFunctionLiteral* instr) {
2433   LOperand* context = UseFixed(instr->context(), cp);
2434   return MarkAsCall(
2435       DefineFixed(new(zone()) LFunctionLiteral(context), r0), instr);
2436 }
2437
2438
2439 LInstruction* LChunkBuilder::DoOsrEntry(HOsrEntry* instr) {
2440   DCHECK(argument_count_ == 0);
2441   allocator_->MarkAsOsrEntry();
2442   current_block_->last_environment()->set_ast_id(instr->ast_id());
2443   return AssignEnvironment(new(zone()) LOsrEntry);
2444 }
2445
2446
2447 LInstruction* LChunkBuilder::DoParameter(HParameter* instr) {
2448   LParameter* result = new(zone()) LParameter;
2449   if (instr->kind() == HParameter::STACK_PARAMETER) {
2450     int spill_index = chunk()->GetParameterStackSlot(instr->index());
2451     return DefineAsSpilled(result, spill_index);
2452   } else {
2453     DCHECK(info()->IsStub());
2454     CallInterfaceDescriptor descriptor =
2455         info()->code_stub()->GetCallInterfaceDescriptor();
2456     int index = static_cast<int>(instr->index());
2457     Register reg = descriptor.GetEnvironmentParameterRegister(index);
2458     return DefineFixed(result, reg);
2459   }
2460 }
2461
2462
2463 LInstruction* LChunkBuilder::DoUnknownOSRValue(HUnknownOSRValue* instr) {
2464   // Use an index that corresponds to the location in the unoptimized frame,
2465   // which the optimized frame will subsume.
2466   int env_index = instr->index();
2467   int spill_index = 0;
2468   if (instr->environment()->is_parameter_index(env_index)) {
2469     spill_index = chunk()->GetParameterStackSlot(env_index);
2470   } else {
2471     spill_index = env_index - instr->environment()->first_local_index();
2472     if (spill_index > LUnallocated::kMaxFixedSlotIndex) {
2473       Retry(kTooManySpillSlotsNeededForOSR);
2474       spill_index = 0;
2475     }
2476   }
2477   return DefineAsSpilled(new(zone()) LUnknownOSRValue, spill_index);
2478 }
2479
2480
2481 LInstruction* LChunkBuilder::DoCallStub(HCallStub* instr) {
2482   LOperand* context = UseFixed(instr->context(), cp);
2483   return MarkAsCall(DefineFixed(new(zone()) LCallStub(context), r0), instr);
2484 }
2485
2486
2487 LInstruction* LChunkBuilder::DoArgumentsObject(HArgumentsObject* instr) {
2488   // There are no real uses of the arguments object.
2489   // arguments.length and element access are supported directly on
2490   // stack arguments, and any real arguments object use causes a bailout.
2491   // So this value is never used.
2492   return NULL;
2493 }
2494
2495
2496 LInstruction* LChunkBuilder::DoCapturedObject(HCapturedObject* instr) {
2497   instr->ReplayEnvironment(current_block_->last_environment());
2498
2499   // There are no real uses of a captured object.
2500   return NULL;
2501 }
2502
2503
2504 LInstruction* LChunkBuilder::DoAccessArgumentsAt(HAccessArgumentsAt* instr) {
2505   info()->MarkAsRequiresFrame();
2506   LOperand* args = UseRegister(instr->arguments());
2507   LOperand* length = UseRegisterOrConstantAtStart(instr->length());
2508   LOperand* index = UseRegisterOrConstantAtStart(instr->index());
2509   return DefineAsRegister(new(zone()) LAccessArgumentsAt(args, length, index));
2510 }
2511
2512
2513 LInstruction* LChunkBuilder::DoToFastProperties(HToFastProperties* instr) {
2514   LOperand* object = UseFixed(instr->value(), r0);
2515   LToFastProperties* result = new(zone()) LToFastProperties(object);
2516   return MarkAsCall(DefineFixed(result, r0), instr);
2517 }
2518
2519
2520 LInstruction* LChunkBuilder::DoTypeof(HTypeof* instr) {
2521   LOperand* context = UseFixed(instr->context(), cp);
2522   LTypeof* result = new(zone()) LTypeof(context, UseFixed(instr->value(), r0));
2523   return MarkAsCall(DefineFixed(result, r0), instr);
2524 }
2525
2526
2527 LInstruction* LChunkBuilder::DoTypeofIsAndBranch(HTypeofIsAndBranch* instr) {
2528   return new(zone()) LTypeofIsAndBranch(UseRegister(instr->value()));
2529 }
2530
2531
2532 LInstruction* LChunkBuilder::DoIsConstructCallAndBranch(
2533     HIsConstructCallAndBranch* instr) {
2534   return new(zone()) LIsConstructCallAndBranch(TempRegister());
2535 }
2536
2537
2538 LInstruction* LChunkBuilder::DoSimulate(HSimulate* instr) {
2539   instr->ReplayEnvironment(current_block_->last_environment());
2540   return NULL;
2541 }
2542
2543
2544 LInstruction* LChunkBuilder::DoStackCheck(HStackCheck* instr) {
2545   if (instr->is_function_entry()) {
2546     LOperand* context = UseFixed(instr->context(), cp);
2547     return MarkAsCall(new(zone()) LStackCheck(context), instr);
2548   } else {
2549     DCHECK(instr->is_backwards_branch());
2550     LOperand* context = UseAny(instr->context());
2551     return AssignEnvironment(
2552         AssignPointerMap(new(zone()) LStackCheck(context)));
2553   }
2554 }
2555
2556
2557 LInstruction* LChunkBuilder::DoEnterInlined(HEnterInlined* instr) {
2558   HEnvironment* outer = current_block_->last_environment();
2559   outer->set_ast_id(instr->ReturnId());
2560   HConstant* undefined = graph()->GetConstantUndefined();
2561   HEnvironment* inner = outer->CopyForInlining(instr->closure(),
2562                                                instr->arguments_count(),
2563                                                instr->function(),
2564                                                undefined,
2565                                                instr->inlining_kind());
2566   // Only replay binding of arguments object if it wasn't removed from graph.
2567   if (instr->arguments_var() != NULL && instr->arguments_object()->IsLinked()) {
2568     inner->Bind(instr->arguments_var(), instr->arguments_object());
2569   }
2570   inner->BindContext(instr->closure_context());
2571   inner->set_entry(instr);
2572   current_block_->UpdateEnvironment(inner);
2573   chunk_->AddInlinedClosure(instr->closure());
2574   return NULL;
2575 }
2576
2577
2578 LInstruction* LChunkBuilder::DoLeaveInlined(HLeaveInlined* instr) {
2579   LInstruction* pop = NULL;
2580
2581   HEnvironment* env = current_block_->last_environment();
2582
2583   if (env->entry()->arguments_pushed()) {
2584     int argument_count = env->arguments_environment()->parameter_count();
2585     pop = new(zone()) LDrop(argument_count);
2586     DCHECK(instr->argument_delta() == -argument_count);
2587   }
2588
2589   HEnvironment* outer = current_block_->last_environment()->
2590       DiscardInlined(false);
2591   current_block_->UpdateEnvironment(outer);
2592
2593   return pop;
2594 }
2595
2596
2597 LInstruction* LChunkBuilder::DoForInPrepareMap(HForInPrepareMap* instr) {
2598   LOperand* context = UseFixed(instr->context(), cp);
2599   LOperand* object = UseFixed(instr->enumerable(), r0);
2600   LForInPrepareMap* result = new(zone()) LForInPrepareMap(context, object);
2601   return MarkAsCall(DefineFixed(result, r0), instr, CAN_DEOPTIMIZE_EAGERLY);
2602 }
2603
2604
2605 LInstruction* LChunkBuilder::DoForInCacheArray(HForInCacheArray* instr) {
2606   LOperand* map = UseRegister(instr->map());
2607   return AssignEnvironment(DefineAsRegister(new(zone()) LForInCacheArray(map)));
2608 }
2609
2610
2611 LInstruction* LChunkBuilder::DoCheckMapValue(HCheckMapValue* instr) {
2612   LOperand* value = UseRegisterAtStart(instr->value());
2613   LOperand* map = UseRegisterAtStart(instr->map());
2614   return AssignEnvironment(new(zone()) LCheckMapValue(value, map));
2615 }
2616
2617
2618 LInstruction* LChunkBuilder::DoLoadFieldByIndex(HLoadFieldByIndex* instr) {
2619   LOperand* object = UseRegister(instr->object());
2620   LOperand* index = UseTempRegister(instr->index());
2621   LLoadFieldByIndex* load = new(zone()) LLoadFieldByIndex(object, index);
2622   LInstruction* result = DefineSameAsFirst(load);
2623   return AssignPointerMap(result);
2624 }
2625
2626
2627 LInstruction* LChunkBuilder::DoStoreFrameContext(HStoreFrameContext* instr) {
2628   LOperand* context = UseRegisterAtStart(instr->context());
2629   return new(zone()) LStoreFrameContext(context);
2630 }
2631
2632
2633 LInstruction* LChunkBuilder::DoAllocateBlockContext(
2634     HAllocateBlockContext* instr) {
2635   LOperand* context = UseFixed(instr->context(), cp);
2636   LOperand* function = UseRegisterAtStart(instr->function());
2637   LAllocateBlockContext* result =
2638       new(zone()) LAllocateBlockContext(context, function);
2639   return MarkAsCall(DefineFixed(result, cp), instr);
2640 }
2641
2642 } }  // namespace v8::internal