[es6] Correct Function.prototype.apply, Reflect.construct and Reflect.apply.

src/ia32/builtins-ia32.cc

 // Copyright 2012 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.
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/code-factory.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 939 matching lines @@
     __ j(not_sign, &loop);  // While non-negative (to copy return address).
     __ pop(ebx);            // Discard copy of return address.
     __ dec(eax);  // One fewer argument (first argument is new receiver).
   }
 
   // 4. Call the callable.
   __ Jump(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
 }
 
 
-static void Generate_PushAppliedArguments(MacroAssembler* masm,
-                                          const int vectorOffset,
-                                          const int argumentsOffset,
-                                          const int indexOffset,
-                                          const int limitOffset) {
-  // Copy all arguments from the array to the stack.
-  Label entry, loop;
-  Register receiver = LoadDescriptor::ReceiverRegister();
-  Register key = LoadDescriptor::NameRegister();
-  Register slot = LoadDescriptor::SlotRegister();
-  Register vector = LoadWithVectorDescriptor::VectorRegister();
-  __ mov(key, Operand(ebp, indexOffset));
-  __ jmp(&entry);
-  __ bind(&loop);
-  __ mov(receiver, Operand(ebp, argumentsOffset));  // load arguments
-
-  // Use inline caching to speed up access to arguments.
-  int slot_index = TypeFeedbackVector::PushAppliedArgumentsIndex();
-  __ mov(slot, Immediate(Smi::FromInt(slot_index)));
-  __ mov(vector, Operand(ebp, vectorOffset));
-  Handle<Code> ic =
-      KeyedLoadICStub(masm->isolate(), LoadICState(kNoExtraICState)).GetCode();
-  __ call(ic, RelocInfo::CODE_TARGET);
-  // It is important that we do not have a test instruction after the
-  // call.  A test instruction after the call is used to indicate that
-  // we have generated an inline version of the keyed load.  In this
-  // case, we know that we are not generating a test instruction next.
-
-  // Push the nth argument.
-  __ push(eax);
-
-  // Update the index on the stack and in register key.
-  __ mov(key, Operand(ebp, indexOffset));
-  __ add(key, Immediate(1 << kSmiTagSize));
-  __ mov(Operand(ebp, indexOffset), key);
-
-  __ bind(&entry);
-  __ cmp(key, Operand(ebp, limitOffset));
-  __ j(not_equal, &loop);
-
-  // On exit, the pushed arguments count is in eax, untagged
-  __ Move(eax, key);
-  __ SmiUntag(eax);
-}
-
-
-// Used by FunctionApply and ReflectApply
-static void Generate_ApplyHelper(MacroAssembler* masm, bool targetIsArgument) {
-  const int kFormalParameters = targetIsArgument ? 3 : 2;
-  const int kStackSize = kFormalParameters + 1;
-
-  // Stack at entry:
-  // esp     : return address
-  // esp[4]  : arguments
-  // esp[8]  : receiver ("this")
-  // esp[12] : function
-  {
-    FrameScope frame_scope(masm, StackFrame::INTERNAL);
-    // Stack frame:
-    // ebp     : Old base pointer
-    // ebp[4]  : return address
-    // ebp[8]  : function arguments
-    // ebp[12] : receiver
-    // ebp[16] : function
-    static const int kArgumentsOffset = kFPOnStackSize + kPCOnStackSize;
-    static const int kReceiverOffset = kArgumentsOffset + kPointerSize;
-    static const int kFunctionOffset = kReceiverOffset + kPointerSize;
-    static const int kVectorOffset =
-        InternalFrameConstants::kCodeOffset - 1 * kPointerSize;
-
-    // Push the vector.
-    __ mov(edi, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
-    __ mov(edi, FieldOperand(edi, SharedFunctionInfo::kFeedbackVectorOffset));
-    __ push(edi);
-
-    __ push(Operand(ebp, kFunctionOffset));   // push this
-    __ push(Operand(ebp, kArgumentsOffset));  // push arguments
-    if (targetIsArgument) {
-      __ InvokeBuiltin(Context::REFLECT_APPLY_PREPARE_BUILTIN_INDEX,
-                       CALL_FUNCTION);
-    } else {
-      __ InvokeBuiltin(Context::APPLY_PREPARE_BUILTIN_INDEX, CALL_FUNCTION);
+void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- eax     : argc
+  //  -- esp[0]  : return address
+  //  -- esp[4]  : argArray
+  //  -- esp[8]  : thisArg
+  //  -- esp[12] : receiver
+  // -----------------------------------
+
+  // 1. Load receiver into edi, argArray into eax (if present), remove all
+  // arguments from the stack (including the receiver), and push thisArg (if
+  // present) instead.
+  {
+    Label no_arg_array, no_this_arg;
+    __ LoadRoot(edx, Heap::kUndefinedValueRootIndex);
+    __ mov(ebx, edx);
+    __ mov(edi, Operand(esp, eax, times_pointer_size, kPointerSize));
+    __ test(eax, eax);
+    __ j(zero, &no_this_arg, Label::kNear);
+    {
+      __ mov(edx, Operand(esp, eax, times_pointer_size, 0));
+      __ cmp(eax, Immediate(1));
+      __ j(equal, &no_arg_array, Label::kNear);
+      __ mov(ebx, Operand(esp, eax, times_pointer_size, -kPointerSize));
+      __ bind(&no_arg_array);
     }
-
-    Generate_CheckStackOverflow(masm, kEaxIsSmiTagged);
-
-    // Push current index and limit.
-    const int kLimitOffset = kVectorOffset - 1 * kPointerSize;
-    const int kIndexOffset = kLimitOffset - 1 * kPointerSize;
-    __ Push(eax);                            // limit
-    __ Push(Immediate(0));                   // index
-    __ Push(Operand(ebp, kReceiverOffset));  // receiver
-
-    // Loop over the arguments array, pushing each value to the stack
-    Generate_PushAppliedArguments(masm, kVectorOffset, kArgumentsOffset,
-                                  kIndexOffset, kLimitOffset);
-
-    // Call the callable.
-    // TODO(bmeurer): This should be a tail call according to ES6.
-    __ mov(edi, Operand(ebp, kFunctionOffset));
-    __ Call(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
-
-    // Leave internal frame.
-  }
-  __ ret(kStackSize * kPointerSize);  // remove this, receiver, and arguments
-}
-
-
-// Used by ReflectConstruct
-static void Generate_ConstructHelper(MacroAssembler* masm) {
-  const int kFormalParameters = 3;
-  const int kStackSize = kFormalParameters + 1;
-
-  // Stack at entry:
-  // esp     : return address
-  // esp[4]  : new target
-  // esp[8]  : arguments
-  // esp[16] : constructor
-  {
-    FrameScope frame_scope(masm, StackFrame::INTERNAL);
-    // Stack frame:
-    // ebp     : Old base pointer
-    // ebp[4]  : return address
-    // ebp[8]  : new target
-    // ebp[12] : arguments
-    // ebp[16] : constructor
-    static const int kNewTargetOffset = kFPOnStackSize + kPCOnStackSize;
-    static const int kArgumentsOffset = kNewTargetOffset + kPointerSize;
-    static const int kFunctionOffset = kArgumentsOffset + kPointerSize;
-    static const int kVectorOffset =
-        InternalFrameConstants::kCodeOffset - 1 * kPointerSize;
-
-    // Push the vector.
-    __ mov(edi, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
-    __ mov(edi, FieldOperand(edi, SharedFunctionInfo::kFeedbackVectorOffset));
-    __ push(edi);
-
-    // If newTarget is not supplied, set it to constructor
-    Label validate_arguments;
-    __ mov(eax, Operand(ebp, kNewTargetOffset));
-    __ CompareRoot(eax, Heap::kUndefinedValueRootIndex);
-    __ j(not_equal, &validate_arguments, Label::kNear);
-    __ mov(eax, Operand(ebp, kFunctionOffset));
-    __ mov(Operand(ebp, kNewTargetOffset), eax);
-
-    // Validate arguments
-    __ bind(&validate_arguments);
-    __ push(Operand(ebp, kFunctionOffset));
-    __ push(Operand(ebp, kArgumentsOffset));
-    __ push(Operand(ebp, kNewTargetOffset));
-    __ InvokeBuiltin(Context::REFLECT_CONSTRUCT_PREPARE_BUILTIN_INDEX,
-                     CALL_FUNCTION);
-
-    Generate_CheckStackOverflow(masm, kEaxIsSmiTagged);
-
-    // Push current index and limit.
-    const int kLimitOffset = kVectorOffset - 1 * kPointerSize;
-    const int kIndexOffset = kLimitOffset - 1 * kPointerSize;
-    __ Push(eax);  // limit
-    __ push(Immediate(0));  // index
-    // Push the constructor function as callee.
-    __ push(Operand(ebp, kFunctionOffset));
-
-    // Loop over the arguments array, pushing each value to the stack
-    Generate_PushAppliedArguments(masm, kVectorOffset, kArgumentsOffset,
-                                  kIndexOffset, kLimitOffset);
-
-    // Use undefined feedback vector
-    __ LoadRoot(ebx, Heap::kUndefinedValueRootIndex);
-    __ mov(edi, Operand(ebp, kFunctionOffset));
-    __ mov(edx, Operand(ebp, kNewTargetOffset));
-
-    // Call the function.
-    __ Call(masm->isolate()->builtins()->Construct(), RelocInfo::CODE_TARGET);
-
-    // Leave internal frame.
-  }
-  // remove this, target, arguments, and newTarget
-  __ ret(kStackSize * kPointerSize);
-}
-
-
-void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
-  Generate_ApplyHelper(masm, false);
+    __ bind(&no_this_arg);
+    __ PopReturnAddressTo(ecx);
+    __ lea(esp, Operand(esp, eax, times_pointer_size, kPointerSize));
+    __ Push(edx);
+    __ PushReturnAddressFrom(ecx);
+    __ Move(eax, ebx);
+  }
+
+  // ----------- S t a t e -------------
+  //  -- eax    : argArray
+  //  -- edi    : receiver
+  //  -- esp[0] : return address
+  //  -- esp[4] : thisArg
+  // -----------------------------------
+
+  // 2. Make sure the receiver is actually callable.
+  Label receiver_not_callable;
+  __ JumpIfSmi(edi, &receiver_not_callable, Label::kNear);
+  __ mov(ecx, FieldOperand(edi, HeapObject::kMapOffset));
+  __ test_b(FieldOperand(ecx, Map::kBitFieldOffset), 1 << Map::kIsCallable);
+  __ j(zero, &receiver_not_callable, Label::kNear);
+
+  // 3. Tail call with no arguments if argArray is null or undefined.
+  Label no_arguments;
+  __ JumpIfRoot(eax, Heap::kNullValueRootIndex, &no_arguments, Label::kNear);
+  __ JumpIfRoot(eax, Heap::kUndefinedValueRootIndex, &no_arguments,
+                Label::kNear);
+
+  // 4a. Apply the receiver to the given argArray (passing undefined for
+  // new.target).
+  __ LoadRoot(edx, Heap::kUndefinedValueRootIndex);
+  __ Jump(masm->isolate()->builtins()->Apply(), RelocInfo::CODE_TARGET);
+
+  // 4b. The argArray is either null or undefined, so we tail call without any
+  // arguments to the receiver.
+  __ bind(&no_arguments);
+  {
+    __ Set(eax, 0);
+    __ Jump(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
+  }
+
+  // 4c. The receiver is not callable, throw an appropriate TypeError.
+  __ bind(&receiver_not_callable);
+  {
+    __ mov(Operand(esp, kPointerSize), edi);
+    __ TailCallRuntime(Runtime::kThrowApplyNonFunction, 1, 1);
+  }
 }
 
 
 void Builtins::Generate_ReflectApply(MacroAssembler* masm) {
-  Generate_ApplyHelper(masm, true);
+  // ----------- S t a t e -------------
+  //  -- eax     : argc
+  //  -- esp[0]  : return address
+  //  -- esp[4]  : argumentsList
+  //  -- esp[8]  : thisArgument
+  //  -- esp[12] : target
+  //  -- esp[16] : receiver
+  // -----------------------------------
+
+  // 1. Load target into edi (if present), argumentsList into eax (if present),
+  // remove all arguments from the stack (including the receiver), and push
+  // thisArgument (if present) instead.
+  {
+    Label done;
+    __ LoadRoot(edi, Heap::kUndefinedValueRootIndex);
+    __ mov(edx, edi);
+    __ mov(ebx, edi);
+    __ cmp(eax, Immediate(1));
+    __ j(below, &done, Label::kNear);
+    __ mov(edi, Operand(esp, eax, times_pointer_size, -0 * kPointerSize));
+    __ j(equal, &done, Label::kNear);
+    __ mov(edx, Operand(esp, eax, times_pointer_size, -1 * kPointerSize));
+    __ cmp(eax, Immediate(3));
+    __ j(below, &done, Label::kNear);
+    __ mov(ebx, Operand(esp, eax, times_pointer_size, -2 * kPointerSize));
+    __ bind(&done);
+    __ PopReturnAddressTo(ecx);
+    __ lea(esp, Operand(esp, eax, times_pointer_size, kPointerSize));
+    __ Push(edx);
+    __ PushReturnAddressFrom(ecx);
+    __ Move(eax, ebx);
+  }
+
+  // ----------- S t a t e -------------
+  //  -- eax    : argumentsList
+  //  -- edi    : target
+  //  -- esp[0] : return address
+  //  -- esp[4] : thisArgument
+  // -----------------------------------
+
+  // 2. Make sure the target is actually callable.
+  Label target_not_callable;
+  __ JumpIfSmi(edi, &target_not_callable, Label::kNear);
+  __ mov(ecx, FieldOperand(edi, HeapObject::kMapOffset));
+  __ test_b(FieldOperand(ecx, Map::kBitFieldOffset), 1 << Map::kIsCallable);
+  __ j(zero, &target_not_callable, Label::kNear);
+
+  // 3a. Apply the target to the given argumentsList (passing undefined for
+  // new.target).
+  __ LoadRoot(edx, Heap::kUndefinedValueRootIndex);
+  __ Jump(masm->isolate()->builtins()->Apply(), RelocInfo::CODE_TARGET);
+
+  // 3b. The target is not callable, throw an appropriate TypeError.
+  __ bind(&target_not_callable);
+  {
+    __ mov(Operand(esp, kPointerSize), edi);
+    __ TailCallRuntime(Runtime::kThrowApplyNonFunction, 1, 1);
+  }
 }
 
 
 void Builtins::Generate_ReflectConstruct(MacroAssembler* masm) {
-  Generate_ConstructHelper(masm);
-}
-
-
+  // ----------- S t a t e -------------
+  //  -- eax     : argc
+  //  -- esp[0]  : return address
+  //  -- esp[4]  : new.target (optional)
+  //  -- esp[8]  : argumentsList
+  //  -- esp[12] : target
+  //  -- esp[16] : receiver
+  // -----------------------------------
+
+  // 1. Load target into edi (if present), argumentsList into eax (if present),
+  // new.target into edx (if present, otherwise use target), remove all
+  // arguments from the stack (including the receiver), and push thisArgument
+  // (if present) instead.
+  {
+    Label done;
+    __ LoadRoot(edi, Heap::kUndefinedValueRootIndex);
+    __ mov(edx, edi);
+    __ mov(ebx, edi);
+    __ cmp(eax, Immediate(1));
+    __ j(below, &done, Label::kNear);
+    __ mov(edi, Operand(esp, eax, times_pointer_size, -0 * kPointerSize));
+    __ mov(edx, edi);
+    __ j(equal, &done, Label::kNear);
+    __ mov(ebx, Operand(esp, eax, times_pointer_size, -1 * kPointerSize));
+    __ cmp(eax, Immediate(3));
+    __ j(below, &done, Label::kNear);
+    __ mov(edx, Operand(esp, eax, times_pointer_size, -2 * kPointerSize));
+    __ bind(&done);
+    __ PopReturnAddressTo(ecx);
+    __ lea(esp, Operand(esp, eax, times_pointer_size, kPointerSize));
+    __ PushRoot(Heap::kUndefinedValueRootIndex);
+    __ PushReturnAddressFrom(ecx);
+    __ Move(eax, ebx);
+  }
+
+  // ----------- S t a t e -------------
+  //  -- eax    : argumentsList
+  //  -- edx    : new.target
+  //  -- edi    : target
+  //  -- esp[0] : return address
+  //  -- esp[4] : receiver (undefined)
+  // -----------------------------------
+
+  // 2. Make sure the target is actually a constructor.
+  Label target_not_constructor;
+  __ JumpIfSmi(edi, &target_not_constructor, Label::kNear);
+  __ mov(ecx, FieldOperand(edi, HeapObject::kMapOffset));
+  __ test_b(FieldOperand(ecx, Map::kBitFieldOffset), 1 << Map::kIsConstructor);
+  __ j(zero, &target_not_constructor, Label::kNear);
+
+  // 3. Make sure the target is actually a constructor.
+  Label new_target_not_constructor;
+  __ JumpIfSmi(edx, &new_target_not_constructor, Label::kNear);
+  __ mov(ecx, FieldOperand(edx, HeapObject::kMapOffset));
+  __ test_b(FieldOperand(ecx, Map::kBitFieldOffset), 1 << Map::kIsConstructor);
+  __ j(zero, &new_target_not_constructor, Label::kNear);
+
+  // 4a. Construct the target with the given new.target and argumentsList.
+  __ Jump(masm->isolate()->builtins()->Apply(), RelocInfo::CODE_TARGET);
+
+  // 4b. The target is not a constructor, throw an appropriate TypeError.
+  __ bind(&target_not_constructor);
+  {
+    __ mov(Operand(esp, kPointerSize), edi);
+    __ TailCallRuntime(Runtime::kThrowCalledNonCallable, 1, 1);
+  }
+
+  // 4c. The new.target is not a constructor, throw an appropriate TypeError.
+  __ bind(&new_target_not_constructor);
+  {
+    __ mov(Operand(esp, kPointerSize), edx);
+    __ TailCallRuntime(Runtime::kThrowCalledNonCallable, 1, 1);
+  }
+}
+
+
 void Builtins::Generate_InternalArrayCode(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- eax : argc
   //  -- esp[0] : return address
   //  -- esp[4] : last argument
   // -----------------------------------
   Label generic_array_code;
 
   // Get the InternalArray function.
   __ LoadGlobalFunction(Context::INTERNAL_ARRAY_FUNCTION_INDEX, edi);
@@ skipping 249 matching lines @@
 
   // Remove caller arguments from the stack.
   STATIC_ASSERT(kSmiTagSize == 1 && kSmiTag == 0);
   __ pop(ecx);
   __ lea(esp, Operand(esp, ebx, times_2, 1 * kPointerSize));  // 1 ~ receiver
   __ push(ecx);
 }
 
 
 // static
+void Builtins::Generate_Apply(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- eax    : argumentsList
+  //  -- edi    : target
+  //  -- edx    : new.target (checked to be constructor or undefined)
+  //  -- esp[0] : return address.
+  //  -- esp[4] : thisArgument
+  // -----------------------------------
+
+  // Create the list of arguments from the array-like argumentsList.
+  {
+    Label create_arguments, create_array, create_runtime, done_create;
+    __ JumpIfSmi(eax, &create_runtime);
+
+    // Load the map of argumentsList into ecx.
+    __ mov(ecx, FieldOperand(eax, HeapObject::kMapOffset));
+
+    // Load native context into ebx.
+    __ mov(ebx, NativeContextOperand());
+
+    // Check if argumentsList is an (unmodified) arguments object.
+    __ cmp(ecx, ContextOperand(ebx, Context::SLOPPY_ARGUMENTS_MAP_INDEX));
+    __ j(equal, &create_arguments);
+    __ cmp(ecx, ContextOperand(ebx, Context::STRICT_ARGUMENTS_MAP_INDEX));
+    __ j(equal, &create_arguments);
+
+    // Check if argumentsList is a fast JSArray.
+    __ CmpInstanceType(ecx, JS_ARRAY_TYPE);
+    __ j(equal, &create_array);
+
+    // Ask the runtime to create the list (actually a FixedArray).
+    __ bind(&create_runtime);
+    {
+      FrameScope scope(masm, StackFrame::INTERNAL);
+      __ Push(edi);
+      __ Push(edx);
+      __ Push(eax);
+      __ CallRuntime(Runtime::kCreateListFromArrayLike, 1);
+      __ Pop(edx);
+      __ Pop(edi);
+      __ mov(ebx, FieldOperand(eax, FixedArray::kLengthOffset));
+      __ SmiUntag(ebx);
+    }
+    __ jmp(&done_create);
+
+    // Try to create the list from an arguments object.
+    __ bind(&create_arguments);
+    __ mov(ebx,
+           FieldOperand(eax, JSObject::kHeaderSize +
+                                 Heap::kArgumentsLengthIndex * kPointerSize));
+    __ mov(ecx, FieldOperand(eax, JSObject::kElementsOffset));
+    __ cmp(ebx, FieldOperand(ecx, FixedArray::kLengthOffset));
+    __ j(not_equal, &create_runtime);
+    __ SmiUntag(ebx);
+    __ mov(eax, ecx);
+    __ jmp(&done_create);
+
+    // Try to create the list from a JSArray object.
+    __ bind(&create_array);
+    __ mov(ecx, FieldOperand(ecx, Map::kBitField2Offset));
+    __ DecodeField<Map::ElementsKindBits>(ecx);
+    STATIC_ASSERT(FAST_SMI_ELEMENTS == 0);
+    STATIC_ASSERT(FAST_HOLEY_SMI_ELEMENTS == 1);
+    STATIC_ASSERT(FAST_ELEMENTS == 2);
+    __ cmp(ecx, Immediate(FAST_ELEMENTS));
+    __ j(above, &create_runtime);
+    __ cmp(ecx, Immediate(FAST_HOLEY_SMI_ELEMENTS));
+    __ j(equal, &create_runtime);
+    __ mov(ebx, FieldOperand(eax, JSArray::kLengthOffset));
+    __ SmiUntag(ebx);
+    __ mov(eax, FieldOperand(eax, JSArray::kElementsOffset));
+
+    __ bind(&done_create);
+  }
+
+  // Check for stack overflow.
+  {
+    // Check the stack for overflow. We are not trying to catch interruptions
+    // (i.e. debug break and preemption) here, so check the "real stack limit".
+    Label done;
+    ExternalReference real_stack_limit =
+        ExternalReference::address_of_real_stack_limit(masm->isolate());
+    __ mov(ecx, Operand::StaticVariable(real_stack_limit));
+    // Make ecx the space we have left. The stack might already be overflowed
+    // here which will cause ecx to become negative.
+    __ neg(ecx);
+    __ add(ecx, esp);
+    __ sar(ecx, kPointerSizeLog2);
+    // Check if the arguments will overflow the stack.
+    __ cmp(ecx, ebx);
+    __ j(greater, &done, Label::kNear);  // Signed comparison.
+    __ TailCallRuntime(Runtime::kThrowStackOverflow, 1, 1);
+    __ bind(&done);
+  }
+
+  // ----------- S t a t e -------------
+  //  -- edi    : target
+  //  -- eax    : args (a FixedArray built from argumentsList)
+  //  -- ebx    : len (number of elements to push from args)
+  //  -- edx    : new.target (checked to be constructor or undefined)
+  //  -- esp[0] : return address.
+  //  -- esp[4] : thisArgument
+  // -----------------------------------
+
+  // Push arguments onto the stack (thisArgument is already on the stack).
+  {
+    __ movd(xmm0, edx);
+    __ PopReturnAddressTo(edx);
+    __ Move(ecx, Immediate(0));
+    Label done, loop;
+    __ bind(&loop);
+    __ cmp(ecx, ebx);
+    __ j(equal, &done, Label::kNear);
+    __ Push(
+        FieldOperand(eax, ecx, times_pointer_size, FixedArray::kHeaderSize));
+    __ inc(ecx);
+    __ jmp(&loop);
+    __ bind(&done);
+    __ PushReturnAddressFrom(edx);
+    __ movd(edx, xmm0);
+    __ Move(eax, ebx);
+  }
+
+  // Dispatch to Call or Construct depending on whether new.target is undefined.
+  {
+    __ CompareRoot(edx, Heap::kUndefinedValueRootIndex);
+    __ j(equal, masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
+    __ Jump(masm->isolate()->builtins()->Construct(), RelocInfo::CODE_TARGET);
+  }
+}
+
+
+// static
 void Builtins::Generate_CallFunction(MacroAssembler* masm,
                                      ConvertReceiverMode mode) {
   // ----------- S t a t e -------------
   //  -- eax : the number of arguments (not including the receiver)
   //  -- edi : the function to call (checked to be a JSFunction)
   // -----------------------------------
   __ AssertFunction(edi);
 
   // See ES6 section 9.2.1 [[Call]] ( thisArgument, argumentsList)
   // Check that the function is not a "classConstructor".
@@ skipping 544 matching lines @@
 
   __ bind(&ok);
   __ ret(0);
 }
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32