text: // Copyright 2014 the V8 project authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #include "src/v8.h"
  
  #if V8_TARGET_ARCH_IA32
  
  #include "src/ic/call-optimization.h"
  #include "src/ic/handler-compiler.h"
  #include "src/ic/ic.h"
  
  namespace v8 {
  namespace internal {
  
  #define __ ACCESS_MASM(masm)
  
  
  void NamedLoadHandlerCompiler::GenerateLoadViaGetter(
      MacroAssembler* masm, Handle<Map> map, Register receiver, Register holder,
      int accessor_index, int expected_arguments, Register scratch) {
    {
      FrameScope scope(masm, StackFrame::INTERNAL);
  
      if (accessor_index >= 0) {
        DCHECK(!holder.is(scratch));
        DCHECK(!receiver.is(scratch));
        // Call the JavaScript getter with the receiver on the stack.
        if (map->IsJSGlobalObjectMap()) {
          // Swap in the global receiver.
          __ mov(scratch,
                 FieldOperand(receiver, JSGlobalObject::kGlobalProxyOffset));
          receiver = scratch;
        }
        __ push(receiver);
        ParameterCount actual(0);
        ParameterCount expected(expected_arguments);
        __ LoadAccessor(edi, holder, accessor_index, ACCESSOR_GETTER);
        __ InvokeFunction(edi, expected, actual, CALL_FUNCTION,
                          NullCallWrapper());
      } else {
        // If we generate a global code snippet for deoptimization only, remember
        // the place to continue after deoptimization.
        masm->isolate()->heap()->SetGetterStubDeoptPCOffset(masm->pc_offset());
      }
  
      // Restore context register.
      __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset));
    }
    __ ret(0);
  }
  
  
  void PropertyHandlerCompiler::PushVectorAndSlot(Register vector,
                                                  Register slot) {
    MacroAssembler* masm = this->masm();
    __ push(vector);
    __ push(slot);
  }
  
  
  void PropertyHandlerCompiler::PopVectorAndSlot(Register vector, Register slot) {
    MacroAssembler* masm = this->masm();
    __ pop(slot);
    __ pop(vector);
  }
  
  
  void PropertyHandlerCompiler::DiscardVectorAndSlot() {
    MacroAssembler* masm = this->masm();
    // Remove vector and slot.
    __ add(esp, Immediate(2 * kPointerSize));
  }
  
  
  void PropertyHandlerCompiler::GenerateDictionaryNegativeLookup(
      MacroAssembler* masm, Label* miss_label, Register receiver,
      Handle<Name> name, Register scratch0, Register scratch1) {
    DCHECK(name->IsUniqueName());
    DCHECK(!receiver.is(scratch0));
    Counters* counters = masm->isolate()->counters();
    __ IncrementCounter(counters->negative_lookups(), 1);
    __ IncrementCounter(counters->negative_lookups_miss(), 1);
  
    __ mov(scratch0, FieldOperand(receiver, HeapObject::kMapOffset));
  
    const int kInterceptorOrAccessCheckNeededMask =
        (1 << Map::kHasNamedInterceptor) | (1 << Map::kIsAccessCheckNeeded);
  
    // Bail out if the receiver has a named interceptor or requires access checks.
    __ test_b(FieldOperand(scratch0, Map::kBitFieldOffset),
              kInterceptorOrAccessCheckNeededMask);
    __ j(not_zero, miss_label);
  
    // Check that receiver is a JSObject.
    __ CmpInstanceType(scratch0, FIRST_SPEC_OBJECT_TYPE);
    __ j(below, miss_label);
  
    // Load properties array.
    Register properties = scratch0;
    __ mov(properties, FieldOperand(receiver, JSObject::kPropertiesOffset));
  
    // Check that the properties array is a dictionary.
    __ cmp(FieldOperand(properties, HeapObject::kMapOffset),
           Immediate(masm->isolate()->factory()->hash_table_map()));
    __ j(not_equal, miss_label);
  
    Label done;
    NameDictionaryLookupStub::GenerateNegativeLookup(masm, miss_label, &done,
                                                     properties, name, scratch1);
    __ bind(&done);
    __ DecrementCounter(counters->negative_lookups_miss(), 1);
  }
  
  
  void NamedLoadHandlerCompiler::GenerateDirectLoadGlobalFunctionPrototype(
      MacroAssembler* masm, int index, Register result, Label* miss) {
    const int offset = Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX);
    __ mov(result, Operand(esi, offset));
    __ mov(result, FieldOperand(result, GlobalObject::kNativeContextOffset));
    __ mov(result, Operand(result, Context::SlotOffset(index)));
    // Load its initial map. The global functions all have initial maps.
    __ mov(result,
           FieldOperand(result, JSFunction::kPrototypeOrInitialMapOffset));
    // Load the prototype from the initial map.
    __ mov(result, FieldOperand(result, Map::kPrototypeOffset));
  }
  
  
  void NamedLoadHandlerCompiler::GenerateLoadFunctionPrototype(
      MacroAssembler* masm, Register receiver, Register scratch1,
      Register scratch2, Label* miss_label) {
    // TODO(mvstanton): This isn't used on ia32. Move all the other
    // platform implementations into a code stub so this method can be removed.
    UNREACHABLE();
  }
  
  
  // Generate call to api function.
  // This function uses push() to generate smaller, faster code than
  // the version above. It is an optimization that should will be removed
  // when api call ICs are generated in hydrogen.
  void PropertyHandlerCompiler::GenerateApiAccessorCall(
      MacroAssembler* masm, const CallOptimization& optimization,
      Handle<Map> receiver_map, Register receiver, Register scratch,
      bool is_store, Register store_parameter, Register accessor_holder,
      int accessor_index) {
    DCHECK(!accessor_holder.is(scratch));
    // Copy return value.
    __ pop(scratch);
    // receiver
    __ push(receiver);
    // Write the arguments to stack frame.
    if (is_store) {
      DCHECK(!receiver.is(store_parameter));
      DCHECK(!scratch.is(store_parameter));
      __ push(store_parameter);
    }
    __ push(scratch);
    // Stack now matches JSFunction abi.
    DCHECK(optimization.is_simple_api_call());
  
    // Abi for CallApiFunctionStub.
    Register callee = edi;
    Register data = ebx;
    Register holder = ecx;
    Register api_function_address = edx;
    scratch = no_reg;
  
    // Put callee in place.
    __ LoadAccessor(callee, accessor_holder, accessor_index,
                    is_store ? ACCESSOR_SETTER : ACCESSOR_GETTER);
  
    // Put holder in place.
    CallOptimization::HolderLookup holder_lookup;
    int holder_depth = 0;
    optimization.LookupHolderOfExpectedType(receiver_map, &holder_lookup,
                                            &holder_depth);
    switch (holder_lookup) {
      case CallOptimization::kHolderIsReceiver:
        __ Move(holder, receiver);
        break;
      case CallOptimization::kHolderFound:
        __ mov(holder, FieldOperand(receiver, HeapObject::kMapOffset));
        __ mov(holder, FieldOperand(holder, Map::kPrototypeOffset));
        for (int i = 1; i < holder_depth; i++) {
          __ mov(holder, FieldOperand(holder, HeapObject::kMapOffset));
          __ mov(holder, FieldOperand(holder, Map::kPrototypeOffset));
        }
        break;
      case CallOptimization::kHolderNotFound:
        UNREACHABLE();
        break;
    }
  
    Isolate* isolate = masm->isolate();
    Handle<CallHandlerInfo> api_call_info = optimization.api_call_info();
    bool call_data_undefined = false;
    // Put call data in place.
    if (api_call_info->data()->IsUndefined()) {
      call_data_undefined = true;
      __ mov(data, Immediate(isolate->factory()->undefined_value()));
    } else {
      __ mov(data, FieldOperand(callee, JSFunction::kSharedFunctionInfoOffset));
      __ mov(data, FieldOperand(data, SharedFunctionInfo::kFunctionDataOffset));
      __ mov(data, FieldOperand(data, FunctionTemplateInfo::kCallCodeOffset));
      __ mov(data, FieldOperand(data, CallHandlerInfo::kDataOffset));
    }
  
    // Put api_function_address in place.
    Address function_address = v8::ToCData<Address>(api_call_info->callback());
    __ mov(api_function_address, Immediate(function_address));
  
    // Jump to stub.
    CallApiAccessorStub stub(isolate, is_store, call_data_undefined);
    __ TailCallStub(&stub);
  }
  
  
  // Generate code to check that a global property cell is empty. Create
  // the property cell at compilation time if no cell exists for the
  // property.
  void PropertyHandlerCompiler::GenerateCheckPropertyCell(
      MacroAssembler* masm, Handle<JSGlobalObject> global, Handle<Name> name,
      Register scratch, Label* miss) {
    Handle<PropertyCell> cell = JSGlobalObject::EnsurePropertyCell(global, name);
    DCHECK(cell->value()->IsTheHole());
    Factory* factory = masm->isolate()->factory();
    Handle<WeakCell> weak_cell = factory->NewWeakCell(cell);
    __ LoadWeakValue(scratch, weak_cell, miss);
    __ cmp(FieldOperand(scratch, PropertyCell::kValueOffset),
           Immediate(factory->the_hole_value()));
    __ j(not_equal, miss);
  }
  
  
  void NamedStoreHandlerCompiler::GenerateStoreViaSetter(
      MacroAssembler* masm, Handle<Map> map, Register receiver, Register holder,
      int accessor_index, int expected_arguments, Register scratch) {
    // ----------- S t a t e -------------
    //  -- esp[0] : return address
    // -----------------------------------
    {
      FrameScope scope(masm, StackFrame::INTERNAL);
  
      // Save value register, so we can restore it later.
      __ push(value());
  
      if (accessor_index >= 0) {
        DCHECK(!holder.is(scratch));
        DCHECK(!receiver.is(scratch));
        DCHECK(!value().is(scratch));
        // Call the JavaScript setter with receiver and value on the stack.
        if (map->IsJSGlobalObjectMap()) {
          __ mov(scratch,
                 FieldOperand(receiver, JSGlobalObject::kGlobalProxyOffset));
          receiver = scratch;
        }
        __ push(receiver);
        __ push(value());
        ParameterCount actual(1);
        ParameterCount expected(expected_arguments);
        __ LoadAccessor(edi, holder, accessor_index, ACCESSOR_SETTER);
        __ InvokeFunction(edi, expected, actual, CALL_FUNCTION,
                          NullCallWrapper());
      } else {
        // If we generate a global code snippet for deoptimization only, remember
        // the place to continue after deoptimization.
        masm->isolate()->heap()->SetSetterStubDeoptPCOffset(masm->pc_offset());
      }
  
      // We have to return the passed value, not the return value of the setter.
      __ pop(eax);
  
      // Restore context register.
      __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset));
    }
    __ ret(0);
  }
  
  
  static void PushInterceptorArguments(MacroAssembler* masm, Register receiver,
                                       Register holder, Register name,
                                       Handle<JSObject> holder_obj) {
    STATIC_ASSERT(NamedLoadHandlerCompiler::kInterceptorArgsNameIndex == 0);
    STATIC_ASSERT(NamedLoadHandlerCompiler::kInterceptorArgsThisIndex == 1);
    STATIC_ASSERT(NamedLoadHandlerCompiler::kInterceptorArgsHolderIndex == 2);
    STATIC_ASSERT(NamedLoadHandlerCompiler::kInterceptorArgsLength == 3);
    __ push(name);
    __ push(receiver);
    __ push(holder);
  }
  
  
  static void CompileCallLoadPropertyWithInterceptor(
      MacroAssembler* masm, Register receiver, Register holder, Register name,
      Handle<JSObject> holder_obj, IC::UtilityId id) {
    PushInterceptorArguments(masm, receiver, holder, name, holder_obj);
    __ CallExternalReference(ExternalReference(IC_Utility(id), masm->isolate()),
                             NamedLoadHandlerCompiler::kInterceptorArgsLength);
  }
  
  
  static void StoreIC_PushArgs(MacroAssembler* masm) {
    Register receiver = StoreDescriptor::ReceiverRegister();
    Register name = StoreDescriptor::NameRegister();
    Register value = StoreDescriptor::ValueRegister();
  
    DCHECK(!ebx.is(receiver) && !ebx.is(name) && !ebx.is(value));
  
    __ pop(ebx);
    __ push(receiver);
    __ push(name);
    __ push(value);
    __ push(ebx);
  }
  
  
  void NamedStoreHandlerCompiler::GenerateSlow(MacroAssembler* masm) {
    // Return address is on the stack.
    StoreIC_PushArgs(masm);
  
    // Do tail-call to runtime routine.
    ExternalReference ref(IC_Utility(IC::kStoreIC_Slow), masm->isolate());
    __ TailCallExternalReference(ref, 3, 1);
  }
  
  
  void ElementHandlerCompiler::GenerateStoreSlow(MacroAssembler* masm) {
    // Return address is on the stack.
    StoreIC_PushArgs(masm);
  
    // Do tail-call to runtime routine.
    ExternalReference ref(IC_Utility(IC::kKeyedStoreIC_Slow), masm->isolate());
    __ TailCallExternalReference(ref, 3, 1);
  }
  
  
  #undef __
  #define __ ACCESS_MASM(masm())
  
  
  void NamedStoreHandlerCompiler::GenerateRestoreName(Label* label,
                                                      Handle<Name> name) {
    if (!label->is_unused()) {
      __ bind(label);
      __ mov(this->name(), Immediate(name));
    }
  }
  
  
  void NamedStoreHandlerCompiler::GenerateRestoreName(Handle<Name> name) {
    __ mov(this->name(), Immediate(name));
  }
  
  
  void NamedStoreHandlerCompiler::GenerateRestoreMap(Handle<Map> transition,
                                                     Register scratch,
                                                     Label* miss) {
    Handle<WeakCell> cell = Map::WeakCellForMap(transition);
    Register map_reg = StoreTransitionDescriptor::MapRegister();
    DCHECK(!map_reg.is(scratch));
    __ LoadWeakValue(map_reg, cell, miss);
    if (transition->CanBeDeprecated()) {
      __ mov(scratch, FieldOperand(map_reg, Map::kBitField3Offset));
      __ and_(scratch, Immediate(Map::Deprecated::kMask));
      __ j(not_zero, miss);
    }
  }
  
  
  void NamedStoreHandlerCompiler::GenerateConstantCheck(Register map_reg,
                                                        int descriptor,
                                                        Register value_reg,
                                                        Register scratch,
                                                        Label* miss_label) {
    DCHECK(!map_reg.is(scratch));
    DCHECK(!map_reg.is(value_reg));
    DCHECK(!value_reg.is(scratch));
    __ LoadInstanceDescriptors(map_reg, scratch);
    __ mov(scratch,
           FieldOperand(scratch, DescriptorArray::GetValueOffset(descriptor)));
    __ cmp(value_reg, scratch);
    __ j(not_equal, miss_label);
  }
  
  
  void NamedStoreHandlerCompiler::GenerateFieldTypeChecks(HeapType* field_type,
                                                          Register value_reg,
                                                          Label* miss_label) {
    Register map_reg = scratch1();
    Register scratch = scratch2();
    DCHECK(!value_reg.is(map_reg));
    DCHECK(!value_reg.is(scratch));
    __ JumpIfSmi(value_reg, miss_label);
    HeapType::Iterator<Map> it = field_type->Classes();
    if (!it.Done()) {
      Label do_store;
      __ mov(map_reg, FieldOperand(value_reg, HeapObject::kMapOffset));
      while (true) {
        __ CmpWeakValue(map_reg, Map::WeakCellForMap(it.Current()), scratch);
        it.Advance();
        if (it.Done()) {
          __ j(not_equal, miss_label);
          break;
        }
        __ j(equal, &do_store, Label::kNear);
      }
      __ bind(&do_store);
    }
  }
  
  
  Register PropertyHandlerCompiler::CheckPrototypes(
      Register object_reg, Register holder_reg, Register scratch1,
      Register scratch2, Handle<Name> name, Label* miss, PrototypeCheckType check,
      ReturnHolder return_what) {
    Handle<Map> receiver_map = map();
  
    // Make sure there's no overlap between holder and object registers.
    DCHECK(!scratch1.is(object_reg) && !scratch1.is(holder_reg));
    DCHECK(!scratch2.is(object_reg) && !scratch2.is(holder_reg) &&
           !scratch2.is(scratch1));
  
    if (FLAG_eliminate_prototype_chain_checks) {
      Handle<Cell> validity_cell =
          Map::GetOrCreatePrototypeChainValidityCell(receiver_map, isolate());
      if (!validity_cell.is_null()) {
        DCHECK_EQ(Smi::FromInt(Map::kPrototypeChainValid),
                  validity_cell->value());
        // Operand::ForCell(...) points to the cell's payload!
        __ cmp(Operand::ForCell(validity_cell),
               Immediate(Smi::FromInt(Map::kPrototypeChainValid)));
        __ j(not_equal, miss);
      }
  
      // The prototype chain of primitives (and their JSValue wrappers) depends
      // on the native context, which can't be guarded by validity cells.
      // |object_reg| holds the native context specific prototype in this case;
      // we need to check its map.
      if (check == CHECK_ALL_MAPS) {
        __ mov(scratch1, FieldOperand(object_reg, HeapObject::kMapOffset));
        Handle<WeakCell> cell = Map::WeakCellForMap(receiver_map);
        __ CmpWeakValue(scratch1, cell, scratch2);
        __ j(not_equal, miss);
      }
    }
  
    // Keep track of the current object in register reg.
    Register reg = object_reg;
    int depth = 0;
  
    Handle<JSObject> current = Handle<JSObject>::null();
    if (receiver_map->IsJSGlobalObjectMap()) {
      current = isolate()->global_object();
    }
  
    // Check access rights to the global object.  This has to happen after
    // the map check so that we know that the object is actually a global
    // object.
    // This allows us to install generated handlers for accesses to the
    // global proxy (as opposed to using slow ICs). See corresponding code
    // in LookupForRead().
    if (receiver_map->IsJSGlobalProxyMap()) {
      __ CheckAccessGlobalProxy(reg, scratch1, scratch2, miss);
    }
  
    Handle<JSObject> prototype = Handle<JSObject>::null();
    Handle<Map> current_map = receiver_map;
    Handle<Map> holder_map(holder()->map());
    // Traverse the prototype chain and check the maps in the prototype chain for
    // fast and global objects or do negative lookup for normal objects.
    while (!current_map.is_identical_to(holder_map)) {
      ++depth;
  
      // Only global objects and objects that do not require access
      // checks are allowed in stubs.
      DCHECK(current_map->IsJSGlobalProxyMap() ||
             !current_map->is_access_check_needed());
  
      prototype = handle(JSObject::cast(current_map->prototype()));
      if (current_map->is_dictionary_map() &&
          !current_map->IsJSGlobalObjectMap()) {
        DCHECK(!current_map->IsJSGlobalProxyMap());  // Proxy maps are fast.
        if (!name->IsUniqueName()) {
          DCHECK(name->IsString());
          name = factory()->InternalizeString(Handle<String>::cast(name));
        }
        DCHECK(current.is_null() ||
               current->property_dictionary()->FindEntry(name) ==
                   NameDictionary::kNotFound);
  
        if (FLAG_eliminate_prototype_chain_checks && depth > 1) {
          // TODO(jkummerow): Cache and re-use weak cell.
          __ LoadWeakValue(reg, isolate()->factory()->NewWeakCell(current), miss);
        }
        GenerateDictionaryNegativeLookup(masm(), miss, reg, name, scratch1,
                                         scratch2);
  
        if (!FLAG_eliminate_prototype_chain_checks) {
          __ mov(scratch1, FieldOperand(reg, HeapObject::kMapOffset));
          __ mov(holder_reg, FieldOperand(scratch1, Map::kPrototypeOffset));
        }
      } else {
        Register map_reg = scratch1;
        if (!FLAG_eliminate_prototype_chain_checks) {
          __ mov(map_reg, FieldOperand(reg, HeapObject::kMapOffset));
        }
        if (current_map->IsJSGlobalObjectMap()) {
          GenerateCheckPropertyCell(masm(), Handle<JSGlobalObject>::cast(current),
                                    name, scratch2, miss);
        } else if (!FLAG_eliminate_prototype_chain_checks &&
                   (depth != 1 || check == CHECK_ALL_MAPS)) {
          Handle<WeakCell> cell = Map::WeakCellForMap(current_map);
          __ CmpWeakValue(map_reg, cell, scratch2);
          __ j(not_equal, miss);
        }
        if (!FLAG_eliminate_prototype_chain_checks) {
          __ mov(holder_reg, FieldOperand(map_reg, Map::kPrototypeOffset));
        }
      }
  
      reg = holder_reg;  // From now on the object will be in holder_reg.
      // Go to the next object in the prototype chain.
      current = prototype;
      current_map = handle(current->map());
    }
  
    DCHECK(!current_map->IsJSGlobalProxyMap());
  
    // Log the check depth.
    LOG(isolate(), IntEvent("check-maps-depth", depth + 1));
  
    if (!FLAG_eliminate_prototype_chain_checks &&
        (depth != 0 || check == CHECK_ALL_MAPS)) {
      // Check the holder map.
      __ mov(scratch1, FieldOperand(reg, HeapObject::kMapOffset));
      Handle<WeakCell> cell = Map::WeakCellForMap(current_map);
      __ CmpWeakValue(scratch1, cell, scratch2);
      __ j(not_equal, miss);
    }
  
    bool return_holder = return_what == RETURN_HOLDER;
    if (FLAG_eliminate_prototype_chain_checks && return_holder && depth != 0) {
      __ LoadWeakValue(reg, isolate()->factory()->NewWeakCell(current), miss);
    }
  
    // Return the register containing the holder.
    return return_holder ? reg : no_reg;
  }
  
  
  void NamedLoadHandlerCompiler::FrontendFooter(Handle<Name> name, Label* miss) {
    if (!miss->is_unused()) {
      Label success;
      __ jmp(&success);
      __ bind(miss);
      if (IC::ICUseVector(kind())) {
        DCHECK(kind() == Code::LOAD_IC);
        PopVectorAndSlot();
      }
      TailCallBuiltin(masm(), MissBuiltin(kind()));
      __ bind(&success);
    }
  }
  
  
  void NamedStoreHandlerCompiler::FrontendFooter(Handle<Name> name, Label* miss) {
    if (!miss->is_unused()) {
      Label success;
      __ jmp(&success);
      GenerateRestoreName(miss, name);
      TailCallBuiltin(masm(), MissBuiltin(kind()));
      __ bind(&success);
    }
  }
  
  
  void NamedLoadHandlerCompiler::GenerateLoadCallback(
      Register reg, Handle<ExecutableAccessorInfo> callback) {
    // Insert additional parameters into the stack frame above return address.
    DCHECK(!scratch3().is(reg));
    __ pop(scratch3());  // Get return address to place it below.
  
    STATIC_ASSERT(PropertyCallbackArguments::kHolderIndex == 0);
    STATIC_ASSERT(PropertyCallbackArguments::kIsolateIndex == 1);
    STATIC_ASSERT(PropertyCallbackArguments::kReturnValueDefaultValueIndex == 2);
    STATIC_ASSERT(PropertyCallbackArguments::kReturnValueOffset == 3);
    STATIC_ASSERT(PropertyCallbackArguments::kDataIndex == 4);
    STATIC_ASSERT(PropertyCallbackArguments::kThisIndex == 5);
    __ push(receiver());  // receiver
    // Push data from ExecutableAccessorInfo.
    Handle<Object> data(callback->data(), isolate());
    if (data->IsUndefined() || data->IsSmi()) {
      __ push(Immediate(data));
    } else {
      DCHECK(!scratch2().is(reg));
      Handle<WeakCell> cell =
          isolate()->factory()->NewWeakCell(Handle<HeapObject>::cast(data));
      // The callback is alive if this instruction is executed,
      // so the weak cell is not cleared and points to data.
      __ GetWeakValue(scratch2(), cell);
      __ push(scratch2());
    }
    __ push(Immediate(isolate()->factory()->undefined_value()));  // ReturnValue
    // ReturnValue default value
    __ push(Immediate(isolate()->factory()->undefined_value()));
    __ push(Immediate(reinterpret_cast<int>(isolate())));
    __ push(reg);  // holder
  
    // Save a pointer to where we pushed the arguments. This will be
    // passed as the const PropertyAccessorInfo& to the C++ callback.
    __ push(esp);
  
    __ push(name());  // name
  
    __ push(scratch3());  // Restore return address.
  
    // Abi for CallApiGetter
    Register getter_address = ApiGetterDescriptor::function_address();
    Address function_address = v8::ToCData<Address>(callback->getter());
    __ mov(getter_address, Immediate(function_address));
  
    CallApiGetterStub stub(isolate());
    __ TailCallStub(&stub);
  }
  
  
  void NamedLoadHandlerCompiler::GenerateLoadConstant(Handle<Object> value) {
    // Return the constant value.
    __ LoadObject(eax, value);
    __ ret(0);
  }
  
  
  void NamedLoadHandlerCompiler::GenerateLoadInterceptorWithFollowup(
      LookupIterator* it, Register holder_reg) {
    DCHECK(holder()->HasNamedInterceptor());
    DCHECK(!holder()->GetNamedInterceptor()->getter()->IsUndefined());
  
    // Compile the interceptor call, followed by inline code to load the
    // property from further up the prototype chain if the call fails.
    // Check that the maps haven't changed.
    DCHECK(holder_reg.is(receiver()) || holder_reg.is(scratch1()));
  
    // Preserve the receiver register explicitly whenever it is different from the
    // holder and it is needed should the interceptor return without any result.
    // The ACCESSOR case needs the receiver to be passed into C++ code, the FIELD
    // case might cause a miss during the prototype check.
    bool must_perform_prototype_check =
        !holder().is_identical_to(it->GetHolder<JSObject>());
    bool must_preserve_receiver_reg =
        !receiver().is(holder_reg) &&
        (it->state() == LookupIterator::ACCESSOR || must_perform_prototype_check);
  
    // Save necessary data before invoking an interceptor.
    // Requires a frame to make GC aware of pushed pointers.
    {
      FrameScope frame_scope(masm(), StackFrame::INTERNAL);
  
      if (must_preserve_receiver_reg) {
        __ push(receiver());
      }
      __ push(holder_reg);
      __ push(this->name());
      InterceptorVectorSlotPush(holder_reg);
      // Invoke an interceptor.  Note: map checks from receiver to
      // interceptor's holder has been compiled before (see a caller
      // of this method.)
      CompileCallLoadPropertyWithInterceptor(
          masm(), receiver(), holder_reg, this->name(), holder(),
          IC::kLoadPropertyWithInterceptorOnly);
  
      // Check if interceptor provided a value for property.  If it's
      // the case, return immediately.
      Label interceptor_failed;
      __ cmp(eax, factory()->no_interceptor_result_sentinel());
      __ j(equal, &interceptor_failed);
      frame_scope.GenerateLeaveFrame();
      __ ret(0);
  
      // Clobber registers when generating debug-code to provoke errors.
      __ bind(&interceptor_failed);
      if (FLAG_debug_code) {
        __ mov(receiver(), Immediate(bit_cast<int32_t>(kZapValue)));
        __ mov(holder_reg, Immediate(bit_cast<int32_t>(kZapValue)));
        __ mov(this->name(), Immediate(bit_cast<int32_t>(kZapValue)));
      }
  
      InterceptorVectorSlotPop(holder_reg);
      __ pop(this->name());
      __ pop(holder_reg);
      if (must_preserve_receiver_reg) {
        __ pop(receiver());
      }
  
      // Leave the internal frame.
    }
  
    GenerateLoadPostInterceptor(it, holder_reg);
  }
  
  
  void NamedLoadHandlerCompiler::GenerateLoadInterceptor(Register holder_reg) {
    DCHECK(holder()->HasNamedInterceptor());
    DCHECK(!holder()->GetNamedInterceptor()->getter()->IsUndefined());
    // Call the runtime system to load the interceptor.
    __ pop(scratch2());  // save old return address
    PushInterceptorArguments(masm(), receiver(), holder_reg, this->name(),
                             holder());
    __ push(scratch2());  // restore old return address
  
    ExternalReference ref = ExternalReference(
        IC_Utility(IC::kLoadPropertyWithInterceptor), isolate());
    __ TailCallExternalReference(
        ref, NamedLoadHandlerCompiler::kInterceptorArgsLength, 1);
  }
  
  
  Handle<Code> NamedStoreHandlerCompiler::CompileStoreCallback(
      Handle<JSObject> object, Handle<Name> name,
      Handle<ExecutableAccessorInfo> callback) {
    Register holder_reg = Frontend(name);
  
    __ pop(scratch1());  // remove the return address
    __ push(receiver());
    __ push(holder_reg);
    // If the callback cannot leak, then push the callback directly,
    // otherwise wrap it in a weak cell.
    if (callback->data()->IsUndefined() || callback->data()->IsSmi()) {
      __ Push(callback);
    } else {
      Handle<WeakCell> cell = isolate()->factory()->NewWeakCell(callback);
      __ Push(cell);
    }
    __ Push(name);
    __ push(value());
    __ push(scratch1());  // restore return address
  
    // Do tail-call to the runtime system.
    ExternalReference store_callback_property =
        ExternalReference(IC_Utility(IC::kStoreCallbackProperty), isolate());
    __ TailCallExternalReference(store_callback_property, 5, 1);
  
    // Return the generated code.
    return GetCode(kind(), Code::FAST, name);
  }
  
  
  Handle<Code> NamedStoreHandlerCompiler::CompileStoreInterceptor(
      Handle<Name> name) {
    __ pop(scratch1());  // remove the return address
    __ push(receiver());
    __ push(this->name());
    __ push(value());
    __ push(scratch1());  // restore return address
  
    // Do tail-call to the runtime system.
    ExternalReference store_ic_property = ExternalReference(
        IC_Utility(IC::kStorePropertyWithInterceptor), isolate());
    __ TailCallExternalReference(store_ic_property, 3, 1);
  
    // Return the generated code.
    return GetCode(kind(), Code::FAST, name);
  }
  
  
  Register NamedStoreHandlerCompiler::value() {
    return StoreDescriptor::ValueRegister();
  }
  
  
  Handle<Code> NamedLoadHandlerCompiler::CompileLoadGlobal(
      Handle<PropertyCell> cell, Handle<Name> name, bool is_configurable) {
    Label miss;
    if (IC::ICUseVector(kind())) {
      PushVectorAndSlot();
    }
    FrontendHeader(receiver(), name, &miss, DONT_RETURN_ANYTHING);
    // Get the value from the cell.
    Register result = StoreDescriptor::ValueRegister();
    Handle<WeakCell> weak_cell = factory()->NewWeakCell(cell);
    __ LoadWeakValue(result, weak_cell, &miss);
    __ mov(result, FieldOperand(result, PropertyCell::kValueOffset));
  
    // Check for deleted property if property can actually be deleted.
    if (is_configurable) {
      __ cmp(result, factory()->the_hole_value());
      __ j(equal, &miss);
    } else if (FLAG_debug_code) {
      __ cmp(result, factory()->the_hole_value());
      __ Check(not_equal, kDontDeleteCellsCannotContainTheHole);
    }
  
    Counters* counters = isolate()->counters();
    __ IncrementCounter(counters->named_load_global_stub(), 1);
    // The code above already loads the result into the return register.
    if (IC::ICUseVector(kind())) {
      DiscardVectorAndSlot();
    }
    __ ret(0);
  
    FrontendFooter(name, &miss);
  
    // Return the generated code.
    return GetCode(kind(), Code::NORMAL, name);
  }
  
  
  #undef __
  }
  }  // namespace v8::internal
  
  #endif  // V8_TARGET_ARCH_IA32
  