deps/v8/src/code-stubs-hydrogen.cc

   1 // Copyright 2012 the V8 project authors. All rights reserved.
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   7 //       notice, this list of conditions and the following disclaimer.
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  14 //       from this software without specific prior written permission.
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  27
  28 #include "v8.h"
  29
  30 #include "code-stubs.h"
  31 #include "hydrogen.h"
  32 #include "lithium.h"
  33
  34 namespace v8 {
  35 namespace internal {
  36
  37
  38 static LChunk* OptimizeGraph(HGraph* graph) {
  39   DisallowHeapAllocation no_allocation;
  40   DisallowHandleAllocation no_handles;
  41   DisallowHandleDereference no_deref;
  42
  43   ASSERT(graph != NULL);
  44   SmartArrayPointer<char> bailout_reason;
  45   if (!graph->Optimize(&bailout_reason)) {
  46     FATAL(bailout_reason.is_empty() ? "unknown" : *bailout_reason);
  47   }
  48   LChunk* chunk = LChunk::NewChunk(graph);
  49   if (chunk == NULL) {
  50     FATAL(graph->info()->bailout_reason());
  51   }
  52   return chunk;
  53 }
  54
  55
  56 class CodeStubGraphBuilderBase : public HGraphBuilder {
  57  public:
  58   CodeStubGraphBuilderBase(Isolate* isolate, HydrogenCodeStub* stub)
  59       : HGraphBuilder(&info_),
  60         arguments_length_(NULL),
  61         info_(stub, isolate),
  62         context_(NULL) {
  63     descriptor_ = stub->GetInterfaceDescriptor(isolate);
  64     parameters_.Reset(new HParameter*[descriptor_->register_param_count_]);
  65   }
  66   virtual bool BuildGraph();
  67
  68  protected:
  69   virtual HValue* BuildCodeStub() = 0;
  70   HParameter* GetParameter(int parameter) {
  71     ASSERT(parameter < descriptor_->register_param_count_);
  72     return parameters_[parameter];
  73   }
  74   HValue* GetArgumentsLength() {
  75     // This is initialized in BuildGraph()
  76     ASSERT(arguments_length_ != NULL);
  77     return arguments_length_;
  78   }
  79   CompilationInfo* info() { return &info_; }
  80   HydrogenCodeStub* stub() { return info_.code_stub(); }
  81   HContext* context() { return context_; }
  82   Isolate* isolate() { return info_.isolate(); }
  83
  84   class ArrayContextChecker {
  85    public:
  86     ArrayContextChecker(HGraphBuilder* builder, HValue* constructor,
  87                         HValue* array_function)
  88         : checker_(builder) {
  89       checker_.If<HCompareObjectEqAndBranch, HValue*>(constructor,
  90                                                       array_function);
  91       checker_.Then();
  92     }
  93
  94     ~ArrayContextChecker() {
  95       checker_.ElseDeopt();
  96       checker_.End();
  97     }
  98    private:
  99     IfBuilder checker_;
 100   };
 101
 102   enum ArgumentClass {
 103     NONE,
 104     SINGLE,
 105     MULTIPLE
 106   };
 107
 108   HValue* BuildArrayConstructor(ElementsKind kind,
 109                                 ContextCheckMode context_mode,
 110                                 AllocationSiteOverrideMode override_mode,
 111                                 ArgumentClass argument_class);
 112   HValue* BuildInternalArrayConstructor(ElementsKind kind,
 113                                         ArgumentClass argument_class);
 114
 115  private:
 116   HValue* BuildArraySingleArgumentConstructor(JSArrayBuilder* builder);
 117   HValue* BuildArrayNArgumentsConstructor(JSArrayBuilder* builder,
 118                                           ElementsKind kind);
 119
 120   SmartArrayPointer<HParameter*> parameters_;
 121   HValue* arguments_length_;
 122   CompilationInfoWithZone info_;
 123   CodeStubInterfaceDescriptor* descriptor_;
 124   HContext* context_;
 125 };
 126
 127
 128 bool CodeStubGraphBuilderBase::BuildGraph() {
 129   // Update the static counter each time a new code stub is generated.
 130   isolate()->counters()->code_stubs()->Increment();
 131
 132   if (FLAG_trace_hydrogen) {
 133     const char* name = CodeStub::MajorName(stub()->MajorKey(), false);
 134     PrintF("-----------------------------------------------------------\n");
 135     PrintF("Compiling stub %s using hydrogen\n", name);
 136     isolate()->GetHTracer()->TraceCompilation(&info_);
 137   }
 138
 139   Zone* zone = this->zone();
 140   int param_count = descriptor_->register_param_count_;
 141   HEnvironment* start_environment = graph()->start_environment();
 142   HBasicBlock* next_block = CreateBasicBlock(start_environment);
 143   current_block()->Goto(next_block);
 144   next_block->SetJoinId(BailoutId::StubEntry());
 145   set_current_block(next_block);
 146
 147   HConstant* undefined_constant = new(zone) HConstant(
 148       isolate()->factory()->undefined_value());
 149   AddInstruction(undefined_constant);
 150   graph()->set_undefined_constant(undefined_constant);
 151
 152   for (int i = 0; i < param_count; ++i) {
 153     HParameter* param =
 154         new(zone) HParameter(i, HParameter::REGISTER_PARAMETER);
 155     AddInstruction(param);
 156     start_environment->Bind(i, param);
 157     parameters_[i] = param;
 158   }
 159
 160   HInstruction* stack_parameter_count;
 161   if (descriptor_->stack_parameter_count_ != NULL) {
 162     ASSERT(descriptor_->environment_length() == (param_count + 1));
 163     stack_parameter_count = new(zone) HParameter(param_count,
 164                                                  HParameter::REGISTER_PARAMETER,
 165                                                  Representation::Integer32());
 166     stack_parameter_count->set_type(HType::Smi());
 167     // It's essential to bind this value to the environment in case of deopt.
 168     AddInstruction(stack_parameter_count);
 169     start_environment->Bind(param_count, stack_parameter_count);
 170     arguments_length_ = stack_parameter_count;
 171   } else {
 172     ASSERT(descriptor_->environment_length() == param_count);
 173     stack_parameter_count = graph()->GetConstantMinus1();
 174     arguments_length_ = graph()->GetConstant0();
 175   }
 176
 177   context_ = new(zone) HContext();
 178   AddInstruction(context_);
 179   start_environment->BindContext(context_);
 180
 181   AddSimulate(BailoutId::StubEntry());
 182
 183   NoObservableSideEffectsScope no_effects(this);
 184
 185   HValue* return_value = BuildCodeStub();
 186
 187   // We might have extra expressions to pop from the stack in addition to the
 188   // arguments above.
 189   HInstruction* stack_pop_count = stack_parameter_count;
 190   if (descriptor_->function_mode_ == JS_FUNCTION_STUB_MODE) {
 191     if (!stack_parameter_count->IsConstant() &&
 192         descriptor_->hint_stack_parameter_count_ < 0) {
 193       HInstruction* amount = graph()->GetConstant1();
 194       stack_pop_count = AddInstruction(
 195           HAdd::New(zone, context_, stack_parameter_count, amount));
 196       stack_pop_count->ChangeRepresentation(Representation::Integer32());
 197       stack_pop_count->ClearFlag(HValue::kCanOverflow);
 198     } else {
 199       int count = descriptor_->hint_stack_parameter_count_;
 200       stack_pop_count = AddInstruction(new(zone) HConstant(count));
 201     }
 202   }
 203
 204   if (current_block() != NULL) {
 205     HReturn* hreturn_instruction = new(zone) HReturn(return_value,
 206                                                      context_,
 207                                                      stack_pop_count);
 208     current_block()->Finish(hreturn_instruction);
 209     set_current_block(NULL);
 210   }
 211   return true;
 212 }
 213
 214
 215 template <class Stub>
 216 class CodeStubGraphBuilder: public CodeStubGraphBuilderBase {
 217  public:
 218   explicit CodeStubGraphBuilder(Stub* stub)
 219       : CodeStubGraphBuilderBase(Isolate::Current(), stub) {}
 220
 221  protected:
 222   virtual HValue* BuildCodeStub() {
 223     if (casted_stub()->IsUninitialized()) {
 224       return BuildCodeUninitializedStub();
 225     } else {
 226       return BuildCodeInitializedStub();
 227     }
 228   }
 229
 230   virtual HValue* BuildCodeInitializedStub() {
 231     UNIMPLEMENTED();
 232     return NULL;
 233   }
 234
 235   virtual HValue* BuildCodeUninitializedStub() {
 236     // Force a deopt that falls back to the runtime.
 237     HValue* undefined = graph()->GetConstantUndefined();
 238     IfBuilder builder(this);
 239     builder.IfNot<HCompareObjectEqAndBranch, HValue*>(undefined, undefined);
 240     builder.Then();
 241     builder.ElseDeopt();
 242     return undefined;
 243   }
 244
 245   Stub* casted_stub() { return static_cast<Stub*>(stub()); }
 246 };
 247
 248
 249 Handle<Code> HydrogenCodeStub::GenerateLightweightMissCode(Isolate* isolate) {
 250   Factory* factory = isolate->factory();
 251
 252   // Generate the new code.
 253   MacroAssembler masm(isolate, NULL, 256);
 254
 255   {
 256     // Update the static counter each time a new code stub is generated.
 257     isolate->counters()->code_stubs()->Increment();
 258
 259     // Nested stubs are not allowed for leaves.
 260     AllowStubCallsScope allow_scope(&masm, false);
 261
 262     // Generate the code for the stub.
 263     masm.set_generating_stub(true);
 264     NoCurrentFrameScope scope(&masm);
 265     GenerateLightweightMiss(&masm);
 266   }
 267
 268   // Create the code object.
 269   CodeDesc desc;
 270   masm.GetCode(&desc);
 271
 272   // Copy the generated code into a heap object.
 273   Code::Flags flags = Code::ComputeFlags(
 274       GetCodeKind(),
 275       GetICState(),
 276       GetExtraICState(),
 277       GetStubType(),
 278       GetStubFlags());
 279   Handle<Code> new_object = factory->NewCode(
 280       desc, flags, masm.CodeObject(), NeedsImmovableCode());
 281   return new_object;
 282 }
 283
 284
 285 template <class Stub>
 286 static Handle<Code> DoGenerateCode(Stub* stub) {
 287   Isolate* isolate = Isolate::Current();
 288   CodeStub::Major  major_key =
 289       static_cast<HydrogenCodeStub*>(stub)->MajorKey();
 290   CodeStubInterfaceDescriptor* descriptor =
 291       isolate->code_stub_interface_descriptor(major_key);
 292   if (descriptor->register_param_count_ < 0) {
 293     stub->InitializeInterfaceDescriptor(isolate, descriptor);
 294   }
 295
 296   // If we are uninitialized we can use a light-weight stub to enter
 297   // the runtime that is significantly faster than using the standard
 298   // stub-failure deopt mechanism.
 299   if (stub->IsUninitialized() && descriptor->has_miss_handler()) {
 300     ASSERT(descriptor->stack_parameter_count_ == NULL);
 301     return stub->GenerateLightweightMissCode(isolate);
 302   }
 303   CodeStubGraphBuilder<Stub> builder(stub);
 304   LChunk* chunk = OptimizeGraph(builder.CreateGraph());
 305   return chunk->Codegen();
 306 }
 307
 308
 309 template <>
 310 HValue* CodeStubGraphBuilder<FastCloneShallowArrayStub>::BuildCodeStub() {
 311   Zone* zone = this->zone();
 312   Factory* factory = isolate()->factory();
 313   HValue* undefined = graph()->GetConstantUndefined();
 314   AllocationSiteMode alloc_site_mode = casted_stub()->allocation_site_mode();
 315   FastCloneShallowArrayStub::Mode mode = casted_stub()->mode();
 316   int length = casted_stub()->length();
 317
 318   HInstruction* boilerplate =
 319       AddInstruction(new(zone) HLoadKeyed(GetParameter(0),
 320                                           GetParameter(1),
 321                                           NULL,
 322                                           FAST_ELEMENTS));
 323
 324   IfBuilder checker(this);
 325   checker.IfNot<HCompareObjectEqAndBranch, HValue*>(boilerplate, undefined);
 326   checker.Then();
 327
 328   if (mode == FastCloneShallowArrayStub::CLONE_ANY_ELEMENTS) {
 329     HValue* elements = AddLoadElements(boilerplate);
 330
 331     IfBuilder if_fixed_cow(this);
 332     if_fixed_cow.IfCompareMap(elements, factory->fixed_cow_array_map());
 333     if_fixed_cow.Then();
 334     environment()->Push(BuildCloneShallowArray(context(),
 335                                                boilerplate,
 336                                                alloc_site_mode,
 337                                                FAST_ELEMENTS,
 338                                                0/*copy-on-write*/));
 339     if_fixed_cow.Else();
 340
 341     IfBuilder if_fixed(this);
 342     if_fixed.IfCompareMap(elements, factory->fixed_array_map());
 343     if_fixed.Then();
 344     environment()->Push(BuildCloneShallowArray(context(),
 345                                                boilerplate,
 346                                                alloc_site_mode,
 347                                                FAST_ELEMENTS,
 348                                                length));
 349     if_fixed.Else();
 350     environment()->Push(BuildCloneShallowArray(context(),
 351                                                boilerplate,
 352                                                alloc_site_mode,
 353                                                FAST_DOUBLE_ELEMENTS,
 354                                                length));
 355   } else {
 356     ElementsKind elements_kind = casted_stub()->ComputeElementsKind();
 357     environment()->Push(BuildCloneShallowArray(context(),
 358                                                boilerplate,
 359                                                alloc_site_mode,
 360                                                elements_kind,
 361                                                length));
 362   }
 363
 364   HValue* result = environment()->Pop();
 365   checker.ElseDeopt();
 366   return result;
 367 }
 368
 369
 370 Handle<Code> FastCloneShallowArrayStub::GenerateCode() {
 371   return DoGenerateCode(this);
 372 }
 373
 374
 375 template <>
 376 HValue* CodeStubGraphBuilder<FastCloneShallowObjectStub>::BuildCodeStub() {
 377   Zone* zone = this->zone();
 378   HValue* undefined = graph()->GetConstantUndefined();
 379
 380   HInstruction* boilerplate =
 381       AddInstruction(new(zone) HLoadKeyed(GetParameter(0),
 382                                           GetParameter(1),
 383                                           NULL,
 384                                           FAST_ELEMENTS));
 385
 386   IfBuilder checker(this);
 387   checker.IfNot<HCompareObjectEqAndBranch, HValue*>(boilerplate, undefined);
 388   checker.And();
 389
 390   int size = JSObject::kHeaderSize + casted_stub()->length() * kPointerSize;
 391   HValue* boilerplate_size =
 392       AddInstruction(new(zone) HInstanceSize(boilerplate));
 393   HValue* size_in_words =
 394       AddInstruction(new(zone) HConstant(size >> kPointerSizeLog2));
 395   checker.IfCompare(boilerplate_size, size_in_words, Token::EQ);
 396   checker.Then();
 397
 398   HValue* size_in_bytes = AddInstruction(new(zone) HConstant(size));
 399   HAllocate::Flags flags = HAllocate::CAN_ALLOCATE_IN_NEW_SPACE;
 400   if (isolate()->heap()->ShouldGloballyPretenure()) {
 401     flags = static_cast<HAllocate::Flags>(
 402        flags | HAllocate::CAN_ALLOCATE_IN_OLD_POINTER_SPACE);
 403   }
 404
 405   HInstruction* object = AddInstruction(new(zone)
 406       HAllocate(context(), size_in_bytes, HType::JSObject(), flags));
 407
 408   for (int i = 0; i < size; i += kPointerSize) {
 409     HObjectAccess access = HObjectAccess::ForJSObjectOffset(i);
 410     AddStore(object, access, AddLoad(boilerplate, access));
 411   }
 412
 413   checker.ElseDeopt();
 414   return object;
 415 }
 416
 417
 418 Handle<Code> FastCloneShallowObjectStub::GenerateCode() {
 419   return DoGenerateCode(this);
 420 }
 421
 422
 423 template <>
 424 HValue* CodeStubGraphBuilder<KeyedLoadFastElementStub>::BuildCodeStub() {
 425   HInstruction* load = BuildUncheckedMonomorphicElementAccess(
 426       GetParameter(0), GetParameter(1), NULL, NULL,
 427       casted_stub()->is_js_array(), casted_stub()->elements_kind(),
 428       false, NEVER_RETURN_HOLE, STANDARD_STORE);
 429   return load;
 430 }
 431
 432
 433 Handle<Code> KeyedLoadFastElementStub::GenerateCode() {
 434   return DoGenerateCode(this);
 435 }
 436
 437
 438 template<>
 439 HValue* CodeStubGraphBuilder<LoadFieldStub>::BuildCodeStub() {
 440   HObjectAccess access = casted_stub()->is_inobject() ?
 441       HObjectAccess::ForJSObjectOffset(casted_stub()->offset()) :
 442       HObjectAccess::ForBackingStoreOffset(casted_stub()->offset());
 443   return AddInstruction(BuildLoadNamedField(GetParameter(0), access,
 444       casted_stub()->representation()));
 445 }
 446
 447
 448 Handle<Code> LoadFieldStub::GenerateCode() {
 449   return DoGenerateCode(this);
 450 }
 451
 452
 453 template<>
 454 HValue* CodeStubGraphBuilder<KeyedLoadFieldStub>::BuildCodeStub() {
 455   HObjectAccess access = casted_stub()->is_inobject() ?
 456       HObjectAccess::ForJSObjectOffset(casted_stub()->offset()) :
 457       HObjectAccess::ForBackingStoreOffset(casted_stub()->offset());
 458   return AddInstruction(BuildLoadNamedField(GetParameter(0), access,
 459       casted_stub()->representation()));
 460 }
 461
 462
 463 Handle<Code> KeyedLoadFieldStub::GenerateCode() {
 464   return DoGenerateCode(this);
 465 }
 466
 467
 468 template <>
 469 HValue* CodeStubGraphBuilder<KeyedStoreFastElementStub>::BuildCodeStub() {
 470   BuildUncheckedMonomorphicElementAccess(
 471       GetParameter(0), GetParameter(1), GetParameter(2), NULL,
 472       casted_stub()->is_js_array(), casted_stub()->elements_kind(),
 473       true, NEVER_RETURN_HOLE, casted_stub()->store_mode());
 474
 475   return GetParameter(2);
 476 }
 477
 478
 479 Handle<Code> KeyedStoreFastElementStub::GenerateCode() {
 480   return DoGenerateCode(this);
 481 }
 482
 483
 484 template <>
 485 HValue* CodeStubGraphBuilder<TransitionElementsKindStub>::BuildCodeStub() {
 486   Zone* zone = this->zone();
 487
 488   HValue* js_array = GetParameter(0);
 489   HValue* map = GetParameter(1);
 490
 491   info()->MarkAsSavesCallerDoubles();
 492
 493   AddInstruction(new(zone) HTrapAllocationMemento(js_array));
 494
 495   HInstruction* array_length =
 496       AddLoad(js_array, HObjectAccess::ForArrayLength());
 497   array_length->set_type(HType::Smi());
 498
 499   ElementsKind to_kind = casted_stub()->to_kind();
 500   BuildNewSpaceArrayCheck(array_length, to_kind);
 501
 502   IfBuilder if_builder(this);
 503
 504   if_builder.IfCompare(array_length, graph()->GetConstant0(), Token::EQ);
 505   if_builder.Then();
 506
 507   // Nothing to do, just change the map.
 508
 509   if_builder.Else();
 510
 511   HInstruction* elements = AddLoadElements(js_array);
 512
 513   HInstruction* elements_length = AddLoadFixedArrayLength(elements);
 514
 515   HValue* new_elements = BuildAllocateElementsAndInitializeElementsHeader(
 516       context(), to_kind, elements_length);
 517
 518   BuildCopyElements(context(), elements,
 519                     casted_stub()->from_kind(), new_elements,
 520                     to_kind, array_length, elements_length);
 521
 522   AddStore(js_array, HObjectAccess::ForElementsPointer(), new_elements);
 523
 524   if_builder.End();
 525
 526   AddStore(js_array, HObjectAccess::ForMap(), map);
 527
 528   return js_array;
 529 }
 530
 531
 532 Handle<Code> TransitionElementsKindStub::GenerateCode() {
 533   return DoGenerateCode(this);
 534 }
 535
 536 HValue* CodeStubGraphBuilderBase::BuildArrayConstructor(
 537     ElementsKind kind,
 538     ContextCheckMode context_mode,
 539     AllocationSiteOverrideMode override_mode,
 540     ArgumentClass argument_class) {
 541   HValue* constructor = GetParameter(ArrayConstructorStubBase::kConstructor);
 542   if (context_mode == CONTEXT_CHECK_REQUIRED) {
 543     HInstruction* array_function = BuildGetArrayFunction(context());
 544     ArrayContextChecker checker(this, constructor, array_function);
 545   }
 546
 547   HValue* property_cell = GetParameter(ArrayConstructorStubBase::kPropertyCell);
 548   JSArrayBuilder array_builder(this, kind, property_cell, constructor,
 549                                override_mode);
 550   HValue* result = NULL;
 551   switch (argument_class) {
 552     case NONE:
 553       result = array_builder.AllocateEmptyArray();
 554       break;
 555     case SINGLE:
 556       result = BuildArraySingleArgumentConstructor(&array_builder);
 557       break;
 558     case MULTIPLE:
 559       result = BuildArrayNArgumentsConstructor(&array_builder, kind);
 560       break;
 561   }
 562
 563   return result;
 564 }
 565
 566
 567 HValue* CodeStubGraphBuilderBase::BuildInternalArrayConstructor(
 568     ElementsKind kind, ArgumentClass argument_class) {
 569   HValue* constructor = GetParameter(
 570       InternalArrayConstructorStubBase::kConstructor);
 571   JSArrayBuilder array_builder(this, kind, constructor);
 572
 573   HValue* result = NULL;
 574   switch (argument_class) {
 575     case NONE:
 576       result = array_builder.AllocateEmptyArray();
 577       break;
 578     case SINGLE:
 579       result = BuildArraySingleArgumentConstructor(&array_builder);
 580       break;
 581     case MULTIPLE:
 582       result = BuildArrayNArgumentsConstructor(&array_builder, kind);
 583       break;
 584   }
 585   return result;
 586 }
 587
 588
 589 HValue* CodeStubGraphBuilderBase::BuildArraySingleArgumentConstructor(
 590     JSArrayBuilder* array_builder) {
 591   // Smi check and range check on the input arg.
 592   HValue* constant_one = graph()->GetConstant1();
 593   HValue* constant_zero = graph()->GetConstant0();
 594
 595   HInstruction* elements = AddInstruction(
 596       new(zone()) HArgumentsElements(false));
 597   HInstruction* argument = AddInstruction(
 598       new(zone()) HAccessArgumentsAt(elements, constant_one, constant_zero));
 599
 600   HConstant* max_alloc_length =
 601       new(zone()) HConstant(JSObject::kInitialMaxFastElementArray);
 602   AddInstruction(max_alloc_length);
 603   const int initial_capacity = JSArray::kPreallocatedArrayElements;
 604   HConstant* initial_capacity_node = new(zone()) HConstant(initial_capacity);
 605   AddInstruction(initial_capacity_node);
 606
 607   HBoundsCheck* checked_arg = Add<HBoundsCheck>(argument, max_alloc_length);
 608   IfBuilder if_builder(this);
 609   if_builder.IfCompare(checked_arg, constant_zero, Token::EQ);
 610   if_builder.Then();
 611   Push(initial_capacity_node);  // capacity
 612   Push(constant_zero);  // length
 613   if_builder.Else();
 614   Push(checked_arg);  // capacity
 615   Push(checked_arg);  // length
 616   if_builder.End();
 617
 618   // Figure out total size
 619   HValue* length = Pop();
 620   HValue* capacity = Pop();
 621   return array_builder->AllocateArray(capacity, length, true);
 622 }
 623
 624
 625 HValue* CodeStubGraphBuilderBase::BuildArrayNArgumentsConstructor(
 626     JSArrayBuilder* array_builder, ElementsKind kind) {
 627   // We need to fill with the hole if it's a smi array in the multi-argument
 628   // case because we might have to bail out while copying arguments into
 629   // the array because they aren't compatible with a smi array.
 630   // If it's a double array, no problem, and if it's fast then no
 631   // problem either because doubles are boxed.
 632   HValue* length = GetArgumentsLength();
 633   bool fill_with_hole = IsFastSmiElementsKind(kind);
 634   HValue* new_object = array_builder->AllocateArray(length,
 635                                                     length,
 636                                                     fill_with_hole);
 637   HValue* elements = array_builder->GetElementsLocation();
 638   ASSERT(elements != NULL);
 639
 640   // Now populate the elements correctly.
 641   LoopBuilder builder(this,
 642                       context(),
 643                       LoopBuilder::kPostIncrement);
 644   HValue* start = graph()->GetConstant0();
 645   HValue* key = builder.BeginBody(start, length, Token::LT);
 646   HInstruction* argument_elements = AddInstruction(
 647       new(zone()) HArgumentsElements(false));
 648   HInstruction* argument = AddInstruction(new(zone()) HAccessArgumentsAt(
 649       argument_elements, length, key));
 650
 651   AddInstruction(new(zone()) HStoreKeyed(elements, key, argument, kind));
 652   builder.EndBody();
 653   return new_object;
 654 }
 655
 656
 657 template <>
 658 HValue* CodeStubGraphBuilder<ArrayNoArgumentConstructorStub>::BuildCodeStub() {
 659   ElementsKind kind = casted_stub()->elements_kind();
 660   ContextCheckMode context_mode = casted_stub()->context_mode();
 661   AllocationSiteOverrideMode override_mode = casted_stub()->override_mode();
 662   return BuildArrayConstructor(kind, context_mode, override_mode, NONE);
 663 }
 664
 665
 666 Handle<Code> ArrayNoArgumentConstructorStub::GenerateCode() {
 667   return DoGenerateCode(this);
 668 }
 669
 670
 671 template <>
 672 HValue* CodeStubGraphBuilder<ArraySingleArgumentConstructorStub>::
 673     BuildCodeStub() {
 674   ElementsKind kind = casted_stub()->elements_kind();
 675   ContextCheckMode context_mode = casted_stub()->context_mode();
 676   AllocationSiteOverrideMode override_mode = casted_stub()->override_mode();
 677   return BuildArrayConstructor(kind, context_mode, override_mode, SINGLE);
 678 }
 679
 680
 681 Handle<Code> ArraySingleArgumentConstructorStub::GenerateCode() {
 682   return DoGenerateCode(this);
 683 }
 684
 685
 686 template <>
 687 HValue* CodeStubGraphBuilder<ArrayNArgumentsConstructorStub>::BuildCodeStub() {
 688   ElementsKind kind = casted_stub()->elements_kind();
 689   ContextCheckMode context_mode = casted_stub()->context_mode();
 690   AllocationSiteOverrideMode override_mode = casted_stub()->override_mode();
 691   return BuildArrayConstructor(kind, context_mode, override_mode, MULTIPLE);
 692 }
 693
 694
 695 Handle<Code> ArrayNArgumentsConstructorStub::GenerateCode() {
 696   return DoGenerateCode(this);
 697 }
 698
 699
 700 template <>
 701 HValue* CodeStubGraphBuilder<InternalArrayNoArgumentConstructorStub>::
 702     BuildCodeStub() {
 703   ElementsKind kind = casted_stub()->elements_kind();
 704   return BuildInternalArrayConstructor(kind, NONE);
 705 }
 706
 707
 708 Handle<Code> InternalArrayNoArgumentConstructorStub::GenerateCode() {
 709   return DoGenerateCode(this);
 710 }
 711
 712
 713 template <>
 714 HValue* CodeStubGraphBuilder<InternalArraySingleArgumentConstructorStub>::
 715     BuildCodeStub() {
 716   ElementsKind kind = casted_stub()->elements_kind();
 717   return BuildInternalArrayConstructor(kind, SINGLE);
 718 }
 719
 720
 721 Handle<Code> InternalArraySingleArgumentConstructorStub::GenerateCode() {
 722   return DoGenerateCode(this);
 723 }
 724
 725
 726 template <>
 727 HValue* CodeStubGraphBuilder<InternalArrayNArgumentsConstructorStub>::
 728     BuildCodeStub() {
 729   ElementsKind kind = casted_stub()->elements_kind();
 730   return BuildInternalArrayConstructor(kind, MULTIPLE);
 731 }
 732
 733
 734 Handle<Code> InternalArrayNArgumentsConstructorStub::GenerateCode() {
 735   return DoGenerateCode(this);
 736 }
 737
 738
 739 template <>
 740 HValue* CodeStubGraphBuilder<CompareNilICStub>::BuildCodeInitializedStub() {
 741   Isolate* isolate = graph()->isolate();
 742   CompareNilICStub* stub = casted_stub();
 743   HIfContinuation continuation;
 744   Handle<Map> sentinel_map(isolate->heap()->meta_map());
 745   Handle<Type> type =
 746       CompareNilICStub::StateToType(isolate, stub->GetState(), sentinel_map);
 747   BuildCompareNil(GetParameter(0), type, RelocInfo::kNoPosition, &continuation);
 748   IfBuilder if_nil(this, &continuation);
 749   if_nil.Then();
 750   if (continuation.IsFalseReachable()) {
 751     if_nil.Else();
 752     if_nil.Return(graph()->GetConstant0());
 753   }
 754   if_nil.End();
 755   return continuation.IsTrueReachable()
 756       ? graph()->GetConstant1()
 757       : graph()->GetConstantUndefined();
 758 }
 759
 760
 761 Handle<Code> CompareNilICStub::GenerateCode() {
 762   return DoGenerateCode(this);
 763 }
 764
 765
 766 template <>
 767 HValue* CodeStubGraphBuilder<ToBooleanStub>::BuildCodeInitializedStub() {
 768   ToBooleanStub* stub = casted_stub();
 769
 770   IfBuilder if_true(this);
 771   if_true.If<HBranch>(GetParameter(0), stub->GetTypes());
 772   if_true.Then();
 773     if_true.Return(graph()->GetConstant1());
 774   if_true.Else();
 775   if_true.End();
 776   return graph()->GetConstant0();
 777 }
 778
 779
 780 Handle<Code> ToBooleanStub::GenerateCode() {
 781   return DoGenerateCode(this);
 782 }
 783
 784
 785 } }  // namespace v8::internal