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

   1 // Copyright 2012 the V8 project authors. All rights reserved.
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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* allocation_site =
 319       AddInstruction(new(zone) HLoadKeyed(GetParameter(0),
 320                                           GetParameter(1),
 321                                           NULL,
 322                                           FAST_ELEMENTS));
 323   IfBuilder checker(this);
 324   checker.IfNot<HCompareObjectEqAndBranch, HValue*>(allocation_site, undefined);
 325   checker.Then();
 326
 327   HObjectAccess access = HObjectAccess::ForAllocationSiteTransitionInfo();
 328   HInstruction* boilerplate = AddLoad(allocation_site, access);
 329   if (mode == FastCloneShallowArrayStub::CLONE_ANY_ELEMENTS) {
 330     HValue* elements = AddLoadElements(boilerplate);
 331
 332     IfBuilder if_fixed_cow(this);
 333     if_fixed_cow.If<HCompareMap>(elements, factory->fixed_cow_array_map());
 334     if_fixed_cow.Then();
 335     environment()->Push(BuildCloneShallowArray(context(),
 336                                                boilerplate,
 337                                                allocation_site,
 338                                                alloc_site_mode,
 339                                                FAST_ELEMENTS,
 340                                                0/*copy-on-write*/));
 341     if_fixed_cow.Else();
 342
 343     IfBuilder if_fixed(this);
 344     if_fixed.If<HCompareMap>(elements, factory->fixed_array_map());
 345     if_fixed.Then();
 346     environment()->Push(BuildCloneShallowArray(context(),
 347                                                boilerplate,
 348                                                allocation_site,
 349                                                alloc_site_mode,
 350                                                FAST_ELEMENTS,
 351                                                length));
 352     if_fixed.Else();
 353     environment()->Push(BuildCloneShallowArray(context(),
 354                                                boilerplate,
 355                                                allocation_site,
 356                                                alloc_site_mode,
 357                                                FAST_DOUBLE_ELEMENTS,
 358                                                length));
 359   } else {
 360     ElementsKind elements_kind = casted_stub()->ComputeElementsKind();
 361     environment()->Push(BuildCloneShallowArray(context(),
 362                                                boilerplate,
 363                                                allocation_site,
 364                                                alloc_site_mode,
 365                                                elements_kind,
 366                                                length));
 367   }
 368
 369   HValue* result = environment()->Pop();
 370   checker.ElseDeopt();
 371   return result;
 372 }
 373
 374
 375 Handle<Code> FastCloneShallowArrayStub::GenerateCode() {
 376   return DoGenerateCode(this);
 377 }
 378
 379
 380 template <>
 381 HValue* CodeStubGraphBuilder<FastCloneShallowObjectStub>::BuildCodeStub() {
 382   Zone* zone = this->zone();
 383   HValue* undefined = graph()->GetConstantUndefined();
 384
 385   HInstruction* boilerplate =
 386       AddInstruction(new(zone) HLoadKeyed(GetParameter(0),
 387                                           GetParameter(1),
 388                                           NULL,
 389                                           FAST_ELEMENTS));
 390
 391   IfBuilder checker(this);
 392   checker.IfNot<HCompareObjectEqAndBranch, HValue*>(boilerplate, undefined);
 393   checker.And();
 394
 395   int size = JSObject::kHeaderSize + casted_stub()->length() * kPointerSize;
 396   HValue* boilerplate_size =
 397       AddInstruction(new(zone) HInstanceSize(boilerplate));
 398   HValue* size_in_words =
 399       AddInstruction(new(zone) HConstant(size >> kPointerSizeLog2));
 400   checker.If<HCompareNumericAndBranch>(boilerplate_size,
 401                                        size_in_words, Token::EQ);
 402   checker.Then();
 403
 404   HValue* size_in_bytes = AddInstruction(new(zone) HConstant(size));
 405   HAllocate::Flags flags = HAllocate::CAN_ALLOCATE_IN_NEW_SPACE;
 406   if (isolate()->heap()->ShouldGloballyPretenure()) {
 407     flags = static_cast<HAllocate::Flags>(
 408        flags | HAllocate::CAN_ALLOCATE_IN_OLD_POINTER_SPACE);
 409   }
 410
 411   HInstruction* object = AddInstruction(new(zone)
 412       HAllocate(context(), size_in_bytes, HType::JSObject(), flags));
 413
 414   for (int i = 0; i < size; i += kPointerSize) {
 415     HObjectAccess access = HObjectAccess::ForJSObjectOffset(i);
 416     AddStore(object, access, AddLoad(boilerplate, access));
 417   }
 418
 419   checker.ElseDeopt();
 420   return object;
 421 }
 422
 423
 424 Handle<Code> FastCloneShallowObjectStub::GenerateCode() {
 425   return DoGenerateCode(this);
 426 }
 427
 428
 429 template <>
 430 HValue* CodeStubGraphBuilder<CreateAllocationSiteStub>::BuildCodeStub() {
 431   Zone* zone = this->zone();
 432
 433   HValue* size = AddInstruction(new(zone) HConstant(AllocationSite::kSize));
 434   HAllocate::Flags flags = HAllocate::DefaultFlags();
 435   flags = static_cast<HAllocate::Flags>(
 436       flags | HAllocate::CAN_ALLOCATE_IN_OLD_POINTER_SPACE);
 437   HInstruction* object = AddInstruction(new(zone)
 438       HAllocate(context(), size, HType::JSObject(), flags));
 439
 440   // Store the map
 441   Handle<Map> allocation_site_map(isolate()->heap()->allocation_site_map(),
 442                                   isolate());
 443   AddStoreMapConstant(object, allocation_site_map);
 444
 445   // Store the payload (smi elements kind)
 446   HValue* initial_elements_kind = AddInstruction(new(zone) HConstant(
 447       GetInitialFastElementsKind()));
 448   Add<HStoreNamedField>(object,
 449                         HObjectAccess::ForAllocationSiteTransitionInfo(),
 450                         initial_elements_kind);
 451
 452   Add<HLinkObjectInList>(object, HObjectAccess::ForAllocationSiteWeakNext(),
 453                          HLinkObjectInList::ALLOCATION_SITE_LIST);
 454
 455   // We use a hammer (SkipWriteBarrier()) to indicate that we know the input
 456   // cell is really a Cell, and so no write barrier is needed.
 457   // TODO(mvstanton): Add a debug_code check to verify the input cell is really
 458   // a cell. (perhaps with a new instruction, HAssert).
 459   HInstruction* cell = GetParameter(0);
 460   HObjectAccess access = HObjectAccess::ForCellValue();
 461   HStoreNamedField* store = AddStore(cell, access, object);
 462   store->SkipWriteBarrier();
 463   return cell;
 464 }
 465
 466
 467 Handle<Code> CreateAllocationSiteStub::GenerateCode() {
 468   return DoGenerateCode(this);
 469 }
 470
 471
 472 template <>
 473 HValue* CodeStubGraphBuilder<KeyedLoadFastElementStub>::BuildCodeStub() {
 474   HInstruction* load = BuildUncheckedMonomorphicElementAccess(
 475       GetParameter(0), GetParameter(1), NULL, NULL,
 476       casted_stub()->is_js_array(), casted_stub()->elements_kind(),
 477       false, NEVER_RETURN_HOLE, STANDARD_STORE);
 478   return load;
 479 }
 480
 481
 482 Handle<Code> KeyedLoadFastElementStub::GenerateCode() {
 483   return DoGenerateCode(this);
 484 }
 485
 486
 487 template<>
 488 HValue* CodeStubGraphBuilder<LoadFieldStub>::BuildCodeStub() {
 489   HObjectAccess access = casted_stub()->is_inobject() ?
 490       HObjectAccess::ForJSObjectOffset(casted_stub()->offset()) :
 491       HObjectAccess::ForBackingStoreOffset(casted_stub()->offset());
 492   return AddInstruction(BuildLoadNamedField(GetParameter(0), access,
 493       casted_stub()->representation()));
 494 }
 495
 496
 497 Handle<Code> LoadFieldStub::GenerateCode() {
 498   return DoGenerateCode(this);
 499 }
 500
 501
 502 template<>
 503 HValue* CodeStubGraphBuilder<KeyedLoadFieldStub>::BuildCodeStub() {
 504   HObjectAccess access = casted_stub()->is_inobject() ?
 505       HObjectAccess::ForJSObjectOffset(casted_stub()->offset()) :
 506       HObjectAccess::ForBackingStoreOffset(casted_stub()->offset());
 507   return AddInstruction(BuildLoadNamedField(GetParameter(0), access,
 508       casted_stub()->representation()));
 509 }
 510
 511
 512 Handle<Code> KeyedLoadFieldStub::GenerateCode() {
 513   return DoGenerateCode(this);
 514 }
 515
 516
 517 template <>
 518 HValue* CodeStubGraphBuilder<KeyedStoreFastElementStub>::BuildCodeStub() {
 519   BuildUncheckedMonomorphicElementAccess(
 520       GetParameter(0), GetParameter(1), GetParameter(2), NULL,
 521       casted_stub()->is_js_array(), casted_stub()->elements_kind(),
 522       true, NEVER_RETURN_HOLE, casted_stub()->store_mode());
 523
 524   return GetParameter(2);
 525 }
 526
 527
 528 Handle<Code> KeyedStoreFastElementStub::GenerateCode() {
 529   return DoGenerateCode(this);
 530 }
 531
 532
 533 template <>
 534 HValue* CodeStubGraphBuilder<TransitionElementsKindStub>::BuildCodeStub() {
 535   info()->MarkAsSavesCallerDoubles();
 536
 537   BuildTransitionElementsKind(GetParameter(0),
 538                               GetParameter(1),
 539                               casted_stub()->from_kind(),
 540                               casted_stub()->to_kind(),
 541                               true);
 542
 543   return GetParameter(0);
 544 }
 545
 546
 547 Handle<Code> TransitionElementsKindStub::GenerateCode() {
 548   return DoGenerateCode(this);
 549 }
 550
 551 HValue* CodeStubGraphBuilderBase::BuildArrayConstructor(
 552     ElementsKind kind,
 553     ContextCheckMode context_mode,
 554     AllocationSiteOverrideMode override_mode,
 555     ArgumentClass argument_class) {
 556   HValue* constructor = GetParameter(ArrayConstructorStubBase::kConstructor);
 557   if (context_mode == CONTEXT_CHECK_REQUIRED) {
 558     HInstruction* array_function = BuildGetArrayFunction(context());
 559     ArrayContextChecker checker(this, constructor, array_function);
 560   }
 561
 562   HValue* property_cell = GetParameter(ArrayConstructorStubBase::kPropertyCell);
 563   // Walk through the property cell to the AllocationSite
 564   HValue* alloc_site = AddInstruction(new(zone()) HLoadNamedField(property_cell,
 565       HObjectAccess::ForCellValue()));
 566   JSArrayBuilder array_builder(this, kind, alloc_site, constructor,
 567                                override_mode);
 568   HValue* result = NULL;
 569   switch (argument_class) {
 570     case NONE:
 571       result = array_builder.AllocateEmptyArray();
 572       break;
 573     case SINGLE:
 574       result = BuildArraySingleArgumentConstructor(&array_builder);
 575       break;
 576     case MULTIPLE:
 577       result = BuildArrayNArgumentsConstructor(&array_builder, kind);
 578       break;
 579   }
 580
 581   return result;
 582 }
 583
 584
 585 HValue* CodeStubGraphBuilderBase::BuildInternalArrayConstructor(
 586     ElementsKind kind, ArgumentClass argument_class) {
 587   HValue* constructor = GetParameter(
 588       InternalArrayConstructorStubBase::kConstructor);
 589   JSArrayBuilder array_builder(this, kind, constructor);
 590
 591   HValue* result = NULL;
 592   switch (argument_class) {
 593     case NONE:
 594       result = array_builder.AllocateEmptyArray();
 595       break;
 596     case SINGLE:
 597       result = BuildArraySingleArgumentConstructor(&array_builder);
 598       break;
 599     case MULTIPLE:
 600       result = BuildArrayNArgumentsConstructor(&array_builder, kind);
 601       break;
 602   }
 603   return result;
 604 }
 605
 606
 607 HValue* CodeStubGraphBuilderBase::BuildArraySingleArgumentConstructor(
 608     JSArrayBuilder* array_builder) {
 609   // Smi check and range check on the input arg.
 610   HValue* constant_one = graph()->GetConstant1();
 611   HValue* constant_zero = graph()->GetConstant0();
 612
 613   HInstruction* elements = AddInstruction(
 614       new(zone()) HArgumentsElements(false));
 615   HInstruction* argument = AddInstruction(
 616       new(zone()) HAccessArgumentsAt(elements, constant_one, constant_zero));
 617
 618   HConstant* max_alloc_length =
 619       new(zone()) HConstant(JSObject::kInitialMaxFastElementArray);
 620   AddInstruction(max_alloc_length);
 621   const int initial_capacity = JSArray::kPreallocatedArrayElements;
 622   HConstant* initial_capacity_node = new(zone()) HConstant(initial_capacity);
 623   AddInstruction(initial_capacity_node);
 624
 625   HBoundsCheck* checked_arg = Add<HBoundsCheck>(argument, max_alloc_length);
 626   IfBuilder if_builder(this);
 627   if_builder.If<HCompareNumericAndBranch>(checked_arg, constant_zero,
 628                                           Token::EQ);
 629   if_builder.Then();
 630   Push(initial_capacity_node);  // capacity
 631   Push(constant_zero);  // length
 632   if_builder.Else();
 633   Push(checked_arg);  // capacity
 634   Push(checked_arg);  // length
 635   if_builder.End();
 636
 637   // Figure out total size
 638   HValue* length = Pop();
 639   HValue* capacity = Pop();
 640   return array_builder->AllocateArray(capacity, length, true);
 641 }
 642
 643
 644 HValue* CodeStubGraphBuilderBase::BuildArrayNArgumentsConstructor(
 645     JSArrayBuilder* array_builder, ElementsKind kind) {
 646   // We need to fill with the hole if it's a smi array in the multi-argument
 647   // case because we might have to bail out while copying arguments into
 648   // the array because they aren't compatible with a smi array.
 649   // If it's a double array, no problem, and if it's fast then no
 650   // problem either because doubles are boxed.
 651   HValue* length = GetArgumentsLength();
 652   bool fill_with_hole = IsFastSmiElementsKind(kind);
 653   HValue* new_object = array_builder->AllocateArray(length,
 654                                                     length,
 655                                                     fill_with_hole);
 656   HValue* elements = array_builder->GetElementsLocation();
 657   ASSERT(elements != NULL);
 658
 659   // Now populate the elements correctly.
 660   LoopBuilder builder(this,
 661                       context(),
 662                       LoopBuilder::kPostIncrement);
 663   HValue* start = graph()->GetConstant0();
 664   HValue* key = builder.BeginBody(start, length, Token::LT);
 665   HInstruction* argument_elements = AddInstruction(
 666       new(zone()) HArgumentsElements(false));
 667   HInstruction* argument = AddInstruction(new(zone()) HAccessArgumentsAt(
 668       argument_elements, length, key));
 669
 670   AddInstruction(new(zone()) HStoreKeyed(elements, key, argument, kind));
 671   builder.EndBody();
 672   return new_object;
 673 }
 674
 675
 676 template <>
 677 HValue* CodeStubGraphBuilder<ArrayNoArgumentConstructorStub>::BuildCodeStub() {
 678   ElementsKind kind = casted_stub()->elements_kind();
 679   ContextCheckMode context_mode = casted_stub()->context_mode();
 680   AllocationSiteOverrideMode override_mode = casted_stub()->override_mode();
 681   return BuildArrayConstructor(kind, context_mode, override_mode, NONE);
 682 }
 683
 684
 685 Handle<Code> ArrayNoArgumentConstructorStub::GenerateCode() {
 686   return DoGenerateCode(this);
 687 }
 688
 689
 690 template <>
 691 HValue* CodeStubGraphBuilder<ArraySingleArgumentConstructorStub>::
 692     BuildCodeStub() {
 693   ElementsKind kind = casted_stub()->elements_kind();
 694   ContextCheckMode context_mode = casted_stub()->context_mode();
 695   AllocationSiteOverrideMode override_mode = casted_stub()->override_mode();
 696   return BuildArrayConstructor(kind, context_mode, override_mode, SINGLE);
 697 }
 698
 699
 700 Handle<Code> ArraySingleArgumentConstructorStub::GenerateCode() {
 701   return DoGenerateCode(this);
 702 }
 703
 704
 705 template <>
 706 HValue* CodeStubGraphBuilder<ArrayNArgumentsConstructorStub>::BuildCodeStub() {
 707   ElementsKind kind = casted_stub()->elements_kind();
 708   ContextCheckMode context_mode = casted_stub()->context_mode();
 709   AllocationSiteOverrideMode override_mode = casted_stub()->override_mode();
 710   return BuildArrayConstructor(kind, context_mode, override_mode, MULTIPLE);
 711 }
 712
 713
 714 Handle<Code> ArrayNArgumentsConstructorStub::GenerateCode() {
 715   return DoGenerateCode(this);
 716 }
 717
 718
 719 template <>
 720 HValue* CodeStubGraphBuilder<InternalArrayNoArgumentConstructorStub>::
 721     BuildCodeStub() {
 722   ElementsKind kind = casted_stub()->elements_kind();
 723   return BuildInternalArrayConstructor(kind, NONE);
 724 }
 725
 726
 727 Handle<Code> InternalArrayNoArgumentConstructorStub::GenerateCode() {
 728   return DoGenerateCode(this);
 729 }
 730
 731
 732 template <>
 733 HValue* CodeStubGraphBuilder<InternalArraySingleArgumentConstructorStub>::
 734     BuildCodeStub() {
 735   ElementsKind kind = casted_stub()->elements_kind();
 736   return BuildInternalArrayConstructor(kind, SINGLE);
 737 }
 738
 739
 740 Handle<Code> InternalArraySingleArgumentConstructorStub::GenerateCode() {
 741   return DoGenerateCode(this);
 742 }
 743
 744
 745 template <>
 746 HValue* CodeStubGraphBuilder<InternalArrayNArgumentsConstructorStub>::
 747     BuildCodeStub() {
 748   ElementsKind kind = casted_stub()->elements_kind();
 749   return BuildInternalArrayConstructor(kind, MULTIPLE);
 750 }
 751
 752
 753 Handle<Code> InternalArrayNArgumentsConstructorStub::GenerateCode() {
 754   return DoGenerateCode(this);
 755 }
 756
 757
 758 template <>
 759 HValue* CodeStubGraphBuilder<CompareNilICStub>::BuildCodeInitializedStub() {
 760   Isolate* isolate = graph()->isolate();
 761   CompareNilICStub* stub = casted_stub();
 762   HIfContinuation continuation;
 763   Handle<Map> sentinel_map(isolate->heap()->meta_map());
 764   Handle<Type> type = stub->GetType(isolate, sentinel_map);
 765   BuildCompareNil(GetParameter(0), type, RelocInfo::kNoPosition, &continuation);
 766   IfBuilder if_nil(this, &continuation);
 767   if_nil.Then();
 768   if (continuation.IsFalseReachable()) {
 769     if_nil.Else();
 770     if_nil.Return(graph()->GetConstant0());
 771   }
 772   if_nil.End();
 773   return continuation.IsTrueReachable()
 774       ? graph()->GetConstant1()
 775       : graph()->GetConstantUndefined();
 776 }
 777
 778
 779 Handle<Code> CompareNilICStub::GenerateCode() {
 780   return DoGenerateCode(this);
 781 }
 782
 783
 784 template <>
 785 HValue* CodeStubGraphBuilder<UnaryOpStub>::BuildCodeInitializedStub() {
 786   UnaryOpStub* stub = casted_stub();
 787   Handle<Type> type = stub->GetType(graph()->isolate());
 788   HValue* input = GetParameter(0);
 789
 790   // Prevent unwanted HChange being inserted to ensure that the stub
 791   // deopts on newly encountered types.
 792   if (!type->Maybe(Type::Double())) {
 793     input = AddInstruction(new(zone())
 794         HForceRepresentation(input, Representation::Smi()));
 795   }
 796
 797   if (!type->Is(Type::Number())) {
 798     // If we expect to see other things than Numbers, we will create a generic
 799     // stub, which handles all numbers and calls into the runtime for the rest.
 800     IfBuilder if_number(this);
 801     if_number.If<HIsNumberAndBranch>(input);
 802     if_number.Then();
 803     HInstruction* res = BuildUnaryMathOp(input, type, stub->operation());
 804     if_number.Return(AddInstruction(res));
 805     if_number.Else();
 806     HValue* function = AddLoadJSBuiltin(stub->ToJSBuiltin(), context());
 807     Add<HPushArgument>(GetParameter(0));
 808     HValue* result = Add<HInvokeFunction>(context(), function, 1);
 809     if_number.Return(result);
 810     if_number.End();
 811     return graph()->GetConstantUndefined();
 812   }
 813
 814   return AddInstruction(BuildUnaryMathOp(input, type, stub->operation()));
 815 }
 816
 817
 818 Handle<Code> UnaryOpStub::GenerateCode() {
 819   return DoGenerateCode(this);
 820 }
 821
 822
 823 template <>
 824 HValue* CodeStubGraphBuilder<ToBooleanStub>::BuildCodeInitializedStub() {
 825   ToBooleanStub* stub = casted_stub();
 826
 827   IfBuilder if_true(this);
 828   if_true.If<HBranch>(GetParameter(0), stub->GetTypes());
 829   if_true.Then();
 830   if_true.Return(graph()->GetConstant1());
 831   if_true.Else();
 832   if_true.End();
 833   return graph()->GetConstant0();
 834 }
 835
 836
 837 Handle<Code> ToBooleanStub::GenerateCode() {
 838   return DoGenerateCode(this);
 839 }
 840
 841
 842 template <>
 843 HValue* CodeStubGraphBuilder<StoreGlobalStub>::BuildCodeInitializedStub() {
 844   StoreGlobalStub* stub = casted_stub();
 845   Handle<Object> hole(isolate()->heap()->the_hole_value(), isolate());
 846   Handle<Object> placeholer_value(Smi::FromInt(0), isolate());
 847   Handle<PropertyCell> placeholder_cell =
 848       isolate()->factory()->NewPropertyCell(placeholer_value);
 849
 850   HParameter* receiver = GetParameter(0);
 851   HParameter* value = GetParameter(2);
 852
 853   if (stub->is_constant()) {
 854     // Assume every store to a constant value changes it.
 855     current_block()->FinishExitWithDeoptimization(HDeoptimize::kUseAll);
 856     set_current_block(NULL);
 857   } else {
 858     HValue* cell = Add<HConstant>(placeholder_cell, Representation::Tagged());
 859
 860     // Check that the map of the global has not changed: use a placeholder map
 861     // that will be replaced later with the global object's map.
 862     Handle<Map> placeholder_map = isolate()->factory()->meta_map();
 863     AddInstruction(HCheckMaps::New(receiver, placeholder_map, zone()));
 864
 865     // Load the payload of the global parameter cell. A hole indicates that the
 866     // property has been deleted and that the store must be handled by the
 867     // runtime.
 868     HObjectAccess access(HObjectAccess::ForCellPayload(isolate()));
 869     HValue* cell_contents = Add<HLoadNamedField>(cell, access);
 870     IfBuilder builder(this);
 871     HValue* hole_value = Add<HConstant>(hole, Representation::Tagged());
 872     builder.If<HCompareObjectEqAndBranch>(cell_contents, hole_value);
 873     builder.Then();
 874     builder.Deopt();
 875     builder.Else();
 876     Add<HStoreNamedField>(cell, access, value);
 877     builder.End();
 878   }
 879   return value;
 880 }
 881
 882
 883 Handle<Code> StoreGlobalStub::GenerateCode() {
 884   return DoGenerateCode(this);
 885 }
 886
 887
 888 template<>
 889 HValue* CodeStubGraphBuilder<ElementsTransitionAndStoreStub>::BuildCodeStub() {
 890   HValue* value = GetParameter(0);
 891   HValue* map = GetParameter(1);
 892   HValue* key = GetParameter(2);
 893   HValue* object = GetParameter(3);
 894
 895   if (FLAG_trace_elements_transitions) {
 896     // Tracing elements transitions is the job of the runtime.
 897     current_block()->FinishExitWithDeoptimization(HDeoptimize::kUseAll);
 898     set_current_block(NULL);
 899   } else {
 900     info()->MarkAsSavesCallerDoubles();
 901
 902     BuildTransitionElementsKind(object, map,
 903                                 casted_stub()->from_kind(),
 904                                 casted_stub()->to_kind(),
 905                                 casted_stub()->is_jsarray());
 906
 907     BuildUncheckedMonomorphicElementAccess(object, key, value, NULL,
 908                                           casted_stub()->is_jsarray(),
 909                                           casted_stub()->to_kind(),
 910                                           true, ALLOW_RETURN_HOLE,
 911                                           casted_stub()->store_mode());
 912   }
 913
 914   return value;
 915 }
 916
 917
 918 Handle<Code> ElementsTransitionAndStoreStub::GenerateCode() {
 919   return DoGenerateCode(this);
 920 }
 921
 922
 923 } }  // namespace v8::internal