text: // 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_X87
  
  #include "src/code-factory.h"
  #include "src/codegen.h"
  #include "src/deoptimizer.h"
  #include "src/full-codegen/full-codegen.h"
  #include "src/x87/frames-x87.h"
  
  namespace v8 {
  namespace internal {
  
  
  #define __ ACCESS_MASM(masm)
  
  
  void Builtins::Generate_Adaptor(MacroAssembler* masm,
                                  CFunctionId id,
                                  BuiltinExtraArguments extra_args) {
    // ----------- S t a t e -------------
    //  -- eax                : number of arguments excluding receiver
    //  -- edi                : target
    //  -- edx                : new.target
    //  -- esp[0]             : return address
    //  -- esp[4]             : last argument
    //  -- ...
    //  -- esp[4 * argc]      : first argument
    //  -- esp[4 * (argc +1)] : receiver
    // -----------------------------------
    __ AssertFunction(edi);
  
    // Make sure we operate in the context of the called function (for example
    // ConstructStubs implemented in C++ will be run in the context of the caller
    // instead of the callee, due to the way that [[Construct]] is defined for
    // ordinary functions).
    __ mov(esi, FieldOperand(edi, JSFunction::kContextOffset));
  
    // Insert extra arguments.
    int num_extra_args = 0;
    if (extra_args != BuiltinExtraArguments::kNone) {
      __ PopReturnAddressTo(ecx);
      if (extra_args & BuiltinExtraArguments::kTarget) {
        ++num_extra_args;
        __ Push(edi);
      }
      if (extra_args & BuiltinExtraArguments::kNewTarget) {
        ++num_extra_args;
        __ Push(edx);
      }
      __ PushReturnAddressFrom(ecx);
    }
  
    // JumpToExternalReference expects eax to contain the number of arguments
    // including the receiver and the extra arguments.
    __ add(eax, Immediate(num_extra_args + 1));
  
    __ JumpToExternalReference(ExternalReference(id, masm->isolate()));
  }
  
  static void GenerateTailCallToReturnedCode(MacroAssembler* masm,
                                             Runtime::FunctionId function_id) {
    // ----------- S t a t e -------------
    //  -- eax : argument count (preserved for callee)
    //  -- edx : new target (preserved for callee)
    //  -- edi : target function (preserved for callee)
    // -----------------------------------
    {
      FrameScope scope(masm, StackFrame::INTERNAL);
      // Push the number of arguments to the callee.
      __ SmiTag(eax);
      __ push(eax);
      // Push a copy of the target function and the new target.
      __ push(edi);
      __ push(edx);
      // Function is also the parameter to the runtime call.
      __ push(edi);
  
      __ CallRuntime(function_id, 1);
      __ mov(ebx, eax);
  
      // Restore target function and new target.
      __ pop(edx);
      __ pop(edi);
      __ pop(eax);
      __ SmiUntag(eax);
    }
  
    __ lea(ebx, FieldOperand(ebx, Code::kHeaderSize));
    __ jmp(ebx);
  }
  
  static void GenerateTailCallToSharedCode(MacroAssembler* masm) {
    __ mov(ebx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
    __ mov(ebx, FieldOperand(ebx, SharedFunctionInfo::kCodeOffset));
    __ lea(ebx, FieldOperand(ebx, Code::kHeaderSize));
    __ jmp(ebx);
  }
  
  void Builtins::Generate_InOptimizationQueue(MacroAssembler* masm) {
    // Checking whether the queued function is ready for install is optional,
    // since we come across interrupts and stack checks elsewhere.  However,
    // not checking may delay installing ready functions, and always checking
    // would be quite expensive.  A good compromise is to first check against
    // stack limit as a cue for an interrupt signal.
    Label ok;
    ExternalReference stack_limit =
        ExternalReference::address_of_stack_limit(masm->isolate());
    __ cmp(esp, Operand::StaticVariable(stack_limit));
    __ j(above_equal, &ok, Label::kNear);
  
    GenerateTailCallToReturnedCode(masm, Runtime::kTryInstallOptimizedCode);
  
    __ bind(&ok);
    GenerateTailCallToSharedCode(masm);
  }
  
  static void Generate_JSConstructStubHelper(MacroAssembler* masm,
                                             bool is_api_function,
                                             bool create_implicit_receiver,
                                             bool check_derived_construct) {
    // ----------- S t a t e -------------
    //  -- eax: number of arguments
    //  -- esi: context
    //  -- edi: constructor function
    //  -- ebx: allocation site or undefined
    //  -- edx: new target
    // -----------------------------------
  
    // Enter a construct frame.
    {
      FrameScope scope(masm, StackFrame::CONSTRUCT);
  
      // Preserve the incoming parameters on the stack.
      __ AssertUndefinedOrAllocationSite(ebx);
      __ push(esi);
      __ push(ebx);
      __ SmiTag(eax);
      __ push(eax);
  
      if (create_implicit_receiver) {
        // Allocate the new receiver object.
        __ Push(edi);
        __ Push(edx);
        FastNewObjectStub stub(masm->isolate());
        __ CallStub(&stub);
        __ mov(ebx, eax);
        __ Pop(edx);
        __ Pop(edi);
  
        // ----------- S t a t e -------------
        //  -- edi: constructor function
        //  -- ebx: newly allocated object
        //  -- edx: new target
        // -----------------------------------
  
        // Retrieve smi-tagged arguments count from the stack.
        __ mov(eax, Operand(esp, 0));
      }
  
      __ SmiUntag(eax);
  
      if (create_implicit_receiver) {
        // Push the allocated receiver to the stack. We need two copies
        // because we may have to return the original one and the calling
        // conventions dictate that the called function pops the receiver.
        __ push(ebx);
        __ push(ebx);
      } else {
        __ PushRoot(Heap::kTheHoleValueRootIndex);
      }
  
      // Set up pointer to last argument.
      __ lea(ebx, Operand(ebp, StandardFrameConstants::kCallerSPOffset));
  
      // Copy arguments and receiver to the expression stack.
      Label loop, entry;
      __ mov(ecx, eax);
      __ jmp(&entry);
      __ bind(&loop);
      __ push(Operand(ebx, ecx, times_4, 0));
      __ bind(&entry);
      __ dec(ecx);
      __ j(greater_equal, &loop);
  
      // Call the function.
      if (is_api_function) {
        __ mov(esi, FieldOperand(edi, JSFunction::kContextOffset));
        Handle<Code> code =
            masm->isolate()->builtins()->HandleApiCallConstruct();
        __ call(code, RelocInfo::CODE_TARGET);
      } else {
        ParameterCount actual(eax);
        __ InvokeFunction(edi, edx, actual, CALL_FUNCTION,
                          CheckDebugStepCallWrapper());
      }
  
      // Store offset of return address for deoptimizer.
      if (create_implicit_receiver && !is_api_function) {
        masm->isolate()->heap()->SetConstructStubDeoptPCOffset(masm->pc_offset());
      }
  
      // Restore context from the frame.
      __ mov(esi, Operand(ebp, ConstructFrameConstants::kContextOffset));
  
      if (create_implicit_receiver) {
        // If the result is an object (in the ECMA sense), we should get rid
        // of the receiver and use the result; see ECMA-262 section 13.2.2-7
        // on page 74.
        Label use_receiver, exit;
  
        // If the result is a smi, it is *not* an object in the ECMA sense.
        __ JumpIfSmi(eax, &use_receiver);
  
        // If the type of the result (stored in its map) is less than
        // FIRST_JS_RECEIVER_TYPE, it is not an object in the ECMA sense.
        __ CmpObjectType(eax, FIRST_JS_RECEIVER_TYPE, ecx);
        __ j(above_equal, &exit);
  
        // Throw away the result of the constructor invocation and use the
        // on-stack receiver as the result.
        __ bind(&use_receiver);
        __ mov(eax, Operand(esp, 0));
  
        // Restore the arguments count and leave the construct frame. The
        // arguments count is stored below the receiver.
        __ bind(&exit);
        __ mov(ebx, Operand(esp, 1 * kPointerSize));
      } else {
        __ mov(ebx, Operand(esp, 0));
      }
  
      // Leave construct frame.
    }
  
    // ES6 9.2.2. Step 13+
    // Check that the result is not a Smi, indicating that the constructor result
    // from a derived class is neither undefined nor an Object.
    if (check_derived_construct) {
      Label dont_throw;
      __ JumpIfNotSmi(eax, &dont_throw);
      {
        FrameScope scope(masm, StackFrame::INTERNAL);
        __ CallRuntime(Runtime::kThrowDerivedConstructorReturnedNonObject);
      }
      __ bind(&dont_throw);
    }
  
    // Remove caller arguments from the stack and return.
    STATIC_ASSERT(kSmiTagSize == 1 && kSmiTag == 0);
    __ pop(ecx);
    __ lea(esp, Operand(esp, ebx, times_2, 1 * kPointerSize));  // 1 ~ receiver
    __ push(ecx);
    if (create_implicit_receiver) {
      __ IncrementCounter(masm->isolate()->counters()->constructed_objects(), 1);
    }
    __ ret(0);
  }
  
  
  void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) {
    Generate_JSConstructStubHelper(masm, false, true, false);
  }
  
  
  void Builtins::Generate_JSConstructStubApi(MacroAssembler* masm) {
    Generate_JSConstructStubHelper(masm, true, false, false);
  }
  
  
  void Builtins::Generate_JSBuiltinsConstructStub(MacroAssembler* masm) {
    Generate_JSConstructStubHelper(masm, false, false, false);
  }
  
  
  void Builtins::Generate_JSBuiltinsConstructStubForDerived(
      MacroAssembler* masm) {
    Generate_JSConstructStubHelper(masm, false, false, true);
  }
  
  
  void Builtins::Generate_ConstructedNonConstructable(MacroAssembler* masm) {
    FrameScope scope(masm, StackFrame::INTERNAL);
    __ push(edi);
    __ CallRuntime(Runtime::kThrowConstructedNonConstructable);
  }
  
  
  enum IsTagged { kEaxIsSmiTagged, kEaxIsUntaggedInt };
  
  
  // Clobbers ecx, edx, edi; preserves all other registers.
  static void Generate_CheckStackOverflow(MacroAssembler* masm,
                                          IsTagged eax_is_tagged) {
    // eax   : the number of items to be pushed to the stack
    //
    // Check the stack for overflow. We are not trying to catch
    // interruptions (e.g. debug break and preemption) here, so the "real stack
    // limit" is checked.
    Label okay;
    ExternalReference real_stack_limit =
        ExternalReference::address_of_real_stack_limit(masm->isolate());
    __ mov(edi, 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.
    __ mov(ecx, esp);
    __ sub(ecx, edi);
    // Make edx the space we need for the array when it is unrolled onto the
    // stack.
    __ mov(edx, eax);
    int smi_tag = eax_is_tagged == kEaxIsSmiTagged ? kSmiTagSize : 0;
    __ shl(edx, kPointerSizeLog2 - smi_tag);
    // Check if the arguments will overflow the stack.
    __ cmp(ecx, edx);
    __ j(greater, &okay);  // Signed comparison.
  
    // Out of stack space.
    __ CallRuntime(Runtime::kThrowStackOverflow);
  
    __ bind(&okay);
  }
  
  
  static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
                                               bool is_construct) {
    ProfileEntryHookStub::MaybeCallEntryHook(masm);
  
    {
      FrameScope scope(masm, StackFrame::INTERNAL);
  
      // Setup the context (we need to use the caller context from the isolate).
      ExternalReference context_address(Isolate::kContextAddress,
                                        masm->isolate());
      __ mov(esi, Operand::StaticVariable(context_address));
  
      // Load the previous frame pointer (ebx) to access C arguments
      __ mov(ebx, Operand(ebp, 0));
  
      // Push the function and the receiver onto the stack.
      __ push(Operand(ebx, EntryFrameConstants::kFunctionArgOffset));
      __ push(Operand(ebx, EntryFrameConstants::kReceiverArgOffset));
  
      // Load the number of arguments and setup pointer to the arguments.
      __ mov(eax, Operand(ebx, EntryFrameConstants::kArgcOffset));
      __ mov(ebx, Operand(ebx, EntryFrameConstants::kArgvOffset));
  
      // Check if we have enough stack space to push all arguments.
      // Expects argument count in eax. Clobbers ecx, edx, edi.
      Generate_CheckStackOverflow(masm, kEaxIsUntaggedInt);
  
      // Copy arguments to the stack in a loop.
      Label loop, entry;
      __ Move(ecx, Immediate(0));
      __ jmp(&entry, Label::kNear);
      __ bind(&loop);
      __ mov(edx, Operand(ebx, ecx, times_4, 0));  // push parameter from argv
      __ push(Operand(edx, 0));  // dereference handle
      __ inc(ecx);
      __ bind(&entry);
      __ cmp(ecx, eax);
      __ j(not_equal, &loop);
  
      // Load the previous frame pointer (ebx) to access C arguments
      __ mov(ebx, Operand(ebp, 0));
  
      // Get the new.target and function from the frame.
      __ mov(edx, Operand(ebx, EntryFrameConstants::kNewTargetArgOffset));
      __ mov(edi, Operand(ebx, EntryFrameConstants::kFunctionArgOffset));
  
      // Invoke the code.
      Handle<Code> builtin = is_construct
                                 ? masm->isolate()->builtins()->Construct()
                                 : masm->isolate()->builtins()->Call();
      __ Call(builtin, RelocInfo::CODE_TARGET);
  
      // Exit the internal frame. Notice that this also removes the empty.
      // context and the function left on the stack by the code
      // invocation.
    }
    __ ret(kPointerSize);  // Remove receiver.
  }
  
  
  void Builtins::Generate_JSEntryTrampoline(MacroAssembler* masm) {
    Generate_JSEntryTrampolineHelper(masm, false);
  }
  
  
  void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) {
    Generate_JSEntryTrampolineHelper(masm, true);
  }
  
  
  // Generate code for entering a JS function with the interpreter.
  // On entry to the function the receiver and arguments have been pushed on the
  // stack left to right.  The actual argument count matches the formal parameter
  // count expected by the function.
  //
  // The live registers are:
  //   o edi: the JS function object being called
  //   o edx: the new target
  //   o esi: our context
  //   o ebp: the caller's frame pointer
  //   o esp: stack pointer (pointing to return address)
  //
  // The function builds an interpreter frame.  See InterpreterFrameConstants in
  // frames.h for its layout.
  void Builtins::Generate_InterpreterEntryTrampoline(MacroAssembler* masm) {
    // Open a frame scope to indicate that there is a frame on the stack.  The
    // MANUAL indicates that the scope shouldn't actually generate code to set up
    // the frame (that is done below).
    FrameScope frame_scope(masm, StackFrame::MANUAL);
    __ push(ebp);  // Caller's frame pointer.
    __ mov(ebp, esp);
    __ push(esi);  // Callee's context.
    __ push(edi);  // Callee's JS function.
    __ push(edx);  // Callee's new target.
  
    // Get the bytecode array from the function object and load the pointer to the
    // first entry into edi (InterpreterBytecodeRegister).
    __ mov(eax, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
  
    Label load_debug_bytecode_array, bytecode_array_loaded;
    __ cmp(FieldOperand(eax, SharedFunctionInfo::kDebugInfoOffset),
           Immediate(DebugInfo::uninitialized()));
    __ j(not_equal, &load_debug_bytecode_array);
    __ mov(kInterpreterBytecodeArrayRegister,
           FieldOperand(eax, SharedFunctionInfo::kFunctionDataOffset));
    __ bind(&bytecode_array_loaded);
  
    if (FLAG_debug_code) {
      // Check function data field is actually a BytecodeArray object.
      __ AssertNotSmi(kInterpreterBytecodeArrayRegister);
      __ CmpObjectType(kInterpreterBytecodeArrayRegister, BYTECODE_ARRAY_TYPE,
                       eax);
      __ Assert(equal, kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry);
    }
  
    // Push bytecode array.
    __ push(kInterpreterBytecodeArrayRegister);
    // Push zero for bytecode array offset.
    __ push(Immediate(0));
  
    // Allocate the local and temporary register file on the stack.
    {
      // Load frame size from the BytecodeArray object.
      __ mov(ebx, FieldOperand(kInterpreterBytecodeArrayRegister,
                               BytecodeArray::kFrameSizeOffset));
  
      // Do a stack check to ensure we don't go over the limit.
      Label ok;
      __ mov(ecx, esp);
      __ sub(ecx, ebx);
      ExternalReference stack_limit =
          ExternalReference::address_of_real_stack_limit(masm->isolate());
      __ cmp(ecx, Operand::StaticVariable(stack_limit));
      __ j(above_equal, &ok);
      __ CallRuntime(Runtime::kThrowStackOverflow);
      __ bind(&ok);
  
      // If ok, push undefined as the initial value for all register file entries.
      Label loop_header;
      Label loop_check;
      __ mov(eax, Immediate(masm->isolate()->factory()->undefined_value()));
      __ jmp(&loop_check);
      __ bind(&loop_header);
      // TODO(rmcilroy): Consider doing more than one push per loop iteration.
      __ push(eax);
      // Continue loop if not done.
      __ bind(&loop_check);
      __ sub(ebx, Immediate(kPointerSize));
      __ j(greater_equal, &loop_header);
    }
  
    // TODO(rmcilroy): List of things not currently dealt with here but done in
    // fullcodegen's prologue:
    //  - Call ProfileEntryHookStub when isolate has a function_entry_hook.
    //  - Code aging of the BytecodeArray object.
  
    // Load accumulator, register file, bytecode offset, dispatch table into
    // registers.
    __ LoadRoot(kInterpreterAccumulatorRegister, Heap::kUndefinedValueRootIndex);
    __ mov(kInterpreterRegisterFileRegister, ebp);
    __ add(kInterpreterRegisterFileRegister,
           Immediate(InterpreterFrameConstants::kRegisterFilePointerFromFp));
    __ mov(kInterpreterBytecodeOffsetRegister,
           Immediate(BytecodeArray::kHeaderSize - kHeapObjectTag));
    __ mov(ebx, Immediate(ExternalReference::interpreter_dispatch_table_address(
                    masm->isolate())));
  
    // Push dispatch table as a stack located parameter to the bytecode handler.
    DCHECK_EQ(-1, kInterpreterDispatchTableSpillSlot);
    __ push(ebx);
  
    // Dispatch to the first bytecode handler for the function.
    __ movzx_b(eax, Operand(kInterpreterBytecodeArrayRegister,
                            kInterpreterBytecodeOffsetRegister, times_1, 0));
    __ mov(ebx, Operand(ebx, eax, times_pointer_size, 0));
    // Restore undefined_value in accumulator (eax)
    // TODO(rmcilroy): Remove this once we move the dispatch table back into a
    // register.
    __ mov(eax, Immediate(masm->isolate()->factory()->undefined_value()));
    // TODO(rmcilroy): Make dispatch table point to code entrys to avoid untagging
    // and header removal.
    __ add(ebx, Immediate(Code::kHeaderSize - kHeapObjectTag));
    __ call(ebx);
  
    // Even though the first bytecode handler was called, we will never return.
    __ Abort(kUnexpectedReturnFromBytecodeHandler);
  
    // Load debug copy of the bytecode array.
    __ bind(&load_debug_bytecode_array);
    Register debug_info = kInterpreterBytecodeArrayRegister;
    __ mov(debug_info, FieldOperand(eax, SharedFunctionInfo::kDebugInfoOffset));
    __ mov(kInterpreterBytecodeArrayRegister,
           FieldOperand(debug_info, DebugInfo::kAbstractCodeIndex));
    __ jmp(&bytecode_array_loaded);
  }
  
  
  void Builtins::Generate_InterpreterExitTrampoline(MacroAssembler* masm) {
    // TODO(rmcilroy): List of things not currently dealt with here but done in
    // fullcodegen's EmitReturnSequence.
    //  - Supporting FLAG_trace for Runtime::TraceExit.
    //  - Support profiler (specifically decrementing profiling_counter
    //    appropriately and calling out to HandleInterrupts if necessary).
  
    // The return value is in accumulator, which is already in rax.
  
    // Leave the frame (also dropping the register file).
    __ leave();
  
    // Drop receiver + arguments and return.
    __ mov(ebx, FieldOperand(kInterpreterBytecodeArrayRegister,
                             BytecodeArray::kParameterSizeOffset));
    __ pop(ecx);
    __ add(esp, ebx);
    __ push(ecx);
    __ ret(0);
  }
  
  
  static void Generate_InterpreterPushArgs(MacroAssembler* masm,
                                           Register array_limit) {
    // ----------- S t a t e -------------
    //  -- ebx : Pointer to the last argument in the args array.
    //  -- array_limit : Pointer to one before the first argument in the
    //                   args array.
    // -----------------------------------
    Label loop_header, loop_check;
    __ jmp(&loop_check);
    __ bind(&loop_header);
    __ Push(Operand(ebx, 0));
    __ sub(ebx, Immediate(kPointerSize));
    __ bind(&loop_check);
    __ cmp(ebx, array_limit);
    __ j(greater, &loop_header, Label::kNear);
  }
  
  
  // static
  void Builtins::Generate_InterpreterPushArgsAndCallImpl(
      MacroAssembler* masm, TailCallMode tail_call_mode) {
    // ----------- S t a t e -------------
    //  -- eax : the number of arguments (not including the receiver)
    //  -- ebx : the address of the first argument to be pushed. Subsequent
    //           arguments should be consecutive above this, in the same order as
    //           they are to be pushed onto the stack.
    //  -- edi : the target to call (can be any Object).
    // -----------------------------------
  
    // Pop return address to allow tail-call after pushing arguments.
    __ Pop(edx);
  
    // Find the address of the last argument.
    __ mov(ecx, eax);
    __ add(ecx, Immediate(1));  // Add one for receiver.
    __ shl(ecx, kPointerSizeLog2);
    __ neg(ecx);
    __ add(ecx, ebx);
  
    Generate_InterpreterPushArgs(masm, ecx);
  
    // Call the target.
    __ Push(edx);  // Re-push return address.
    __ Jump(masm->isolate()->builtins()->Call(ConvertReceiverMode::kAny,
                                              tail_call_mode),
            RelocInfo::CODE_TARGET);
  }
  
  
  // static
  void Builtins::Generate_InterpreterPushArgsAndConstruct(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax : the number of arguments (not including the receiver)
    //  -- edx : the new target
    //  -- edi : the constructor
    //  -- ebx : the address of the first argument to be pushed. Subsequent
    //           arguments should be consecutive above this, in the same order as
    //           they are to be pushed onto the stack.
    // -----------------------------------
  
    // Pop return address to allow tail-call after pushing arguments.
    __ Pop(ecx);
  
    // Push edi in the slot meant for receiver. We need an extra register
    // so store edi temporarily on stack.
    __ Push(edi);
  
    // Find the address of the last argument.
    __ mov(edi, eax);
    __ neg(edi);
    __ shl(edi, kPointerSizeLog2);
    __ add(edi, ebx);
  
    Generate_InterpreterPushArgs(masm, edi);
  
    // Restore the constructor from slot on stack. It was pushed at the slot
    // meant for receiver.
    __ mov(edi, Operand(esp, eax, times_pointer_size, 0));
  
    // Re-push return address.
    __ Push(ecx);
  
    // Call the constructor with unmodified eax, edi, ebi values.
    __ Jump(masm->isolate()->builtins()->Construct(), RelocInfo::CODE_TARGET);
  }
  
  
  static void Generate_EnterBytecodeDispatch(MacroAssembler* masm) {
    // Initialize register file register.
    __ mov(kInterpreterRegisterFileRegister, ebp);
    __ add(kInterpreterRegisterFileRegister,
           Immediate(InterpreterFrameConstants::kRegisterFilePointerFromFp));
  
    // Get the bytecode array pointer from the frame.
    __ mov(kInterpreterBytecodeArrayRegister,
           Operand(kInterpreterRegisterFileRegister,
                   InterpreterFrameConstants::kBytecodeArrayFromRegisterPointer));
  
    if (FLAG_debug_code) {
      // Check function data field is actually a BytecodeArray object.
      __ AssertNotSmi(kInterpreterBytecodeArrayRegister);
      __ CmpObjectType(kInterpreterBytecodeArrayRegister, BYTECODE_ARRAY_TYPE,
                       ebx);
      __ Assert(equal, kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry);
    }
  
    // Get the target bytecode offset from the frame.
    __ mov(
        kInterpreterBytecodeOffsetRegister,
        Operand(kInterpreterRegisterFileRegister,
                InterpreterFrameConstants::kBytecodeOffsetFromRegisterPointer));
    __ SmiUntag(kInterpreterBytecodeOffsetRegister);
  
    // Push dispatch table as a stack located parameter to the bytecode handler.
    __ mov(ebx, Immediate(ExternalReference::interpreter_dispatch_table_address(
                    masm->isolate())));
    DCHECK_EQ(-1, kInterpreterDispatchTableSpillSlot);
    __ Pop(esi);
    __ Push(ebx);
    __ Push(esi);
  
    // Dispatch to the target bytecode.
    __ movzx_b(esi, Operand(kInterpreterBytecodeArrayRegister,
                            kInterpreterBytecodeOffsetRegister, times_1, 0));
    __ mov(ebx, Operand(ebx, esi, times_pointer_size, 0));
  
    // Get the context from the frame.
    __ mov(kContextRegister,
           Operand(kInterpreterRegisterFileRegister,
                   InterpreterFrameConstants::kContextFromRegisterPointer));
  
    // TODO(rmcilroy): Make dispatch table point to code entrys to avoid untagging
    // and header removal.
    __ add(ebx, Immediate(Code::kHeaderSize - kHeapObjectTag));
    __ jmp(ebx);
  }
  
  
  static void Generate_InterpreterNotifyDeoptimizedHelper(
      MacroAssembler* masm, Deoptimizer::BailoutType type) {
    // Enter an internal frame.
    {
      FrameScope scope(masm, StackFrame::INTERNAL);
  
      // Pass the deoptimization type to the runtime system.
      __ Push(Smi::FromInt(static_cast<int>(type)));
      __ CallRuntime(Runtime::kNotifyDeoptimized);
      // Tear down internal frame.
    }
  
    // Drop state (we don't use these for interpreter deopts) and and pop the
    // accumulator value into the accumulator register and push PC at top
    // of stack (to simulate initial call to bytecode handler in interpreter entry
    // trampoline).
    __ Pop(ebx);
    __ Drop(1);
    __ Pop(kInterpreterAccumulatorRegister);
    __ Push(ebx);
  
    // Enter the bytecode dispatch.
    Generate_EnterBytecodeDispatch(masm);
  }
  
  
  void Builtins::Generate_InterpreterNotifyDeoptimized(MacroAssembler* masm) {
    Generate_InterpreterNotifyDeoptimizedHelper(masm, Deoptimizer::EAGER);
  }
  
  
  void Builtins::Generate_InterpreterNotifySoftDeoptimized(MacroAssembler* masm) {
    Generate_InterpreterNotifyDeoptimizedHelper(masm, Deoptimizer::SOFT);
  }
  
  
  void Builtins::Generate_InterpreterNotifyLazyDeoptimized(MacroAssembler* masm) {
    Generate_InterpreterNotifyDeoptimizedHelper(masm, Deoptimizer::LAZY);
  }
  
  void Builtins::Generate_InterpreterEnterBytecodeDispatch(MacroAssembler* masm) {
    // Set the address of the interpreter entry trampoline as a return address.
    // This simulates the initial call to bytecode handlers in interpreter entry
    // trampoline. The return will never actually be taken, but our stack walker
    // uses this address to determine whether a frame is interpreted.
    __ Push(masm->isolate()->builtins()->InterpreterEntryTrampoline());
  
    Generate_EnterBytecodeDispatch(masm);
  }
  
  
  void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
    GenerateTailCallToReturnedCode(masm, Runtime::kCompileLazy);
  }
  
  
  void Builtins::Generate_CompileOptimized(MacroAssembler* masm) {
    GenerateTailCallToReturnedCode(masm,
                                   Runtime::kCompileOptimized_NotConcurrent);
  }
  
  
  void Builtins::Generate_CompileOptimizedConcurrent(MacroAssembler* masm) {
    GenerateTailCallToReturnedCode(masm, Runtime::kCompileOptimized_Concurrent);
  }
  
  
  static void GenerateMakeCodeYoungAgainCommon(MacroAssembler* masm) {
    // For now, we are relying on the fact that make_code_young doesn't do any
    // garbage collection which allows us to save/restore the registers without
    // worrying about which of them contain pointers. We also don't build an
    // internal frame to make the code faster, since we shouldn't have to do stack
    // crawls in MakeCodeYoung. This seems a bit fragile.
  
    // Re-execute the code that was patched back to the young age when
    // the stub returns.
    __ sub(Operand(esp, 0), Immediate(5));
    __ pushad();
    __ mov(eax, Operand(esp, 8 * kPointerSize));
    {
      FrameScope scope(masm, StackFrame::MANUAL);
      __ PrepareCallCFunction(2, ebx);
      __ mov(Operand(esp, 1 * kPointerSize),
             Immediate(ExternalReference::isolate_address(masm->isolate())));
      __ mov(Operand(esp, 0), eax);
      __ CallCFunction(
          ExternalReference::get_make_code_young_function(masm->isolate()), 2);
    }
    __ popad();
    __ ret(0);
  }
  
  #define DEFINE_CODE_AGE_BUILTIN_GENERATOR(C)                 \
  void Builtins::Generate_Make##C##CodeYoungAgainEvenMarking(  \
      MacroAssembler* masm) {                                  \
    GenerateMakeCodeYoungAgainCommon(masm);                    \
  }                                                            \
  void Builtins::Generate_Make##C##CodeYoungAgainOddMarking(   \
      MacroAssembler* masm) {                                  \
    GenerateMakeCodeYoungAgainCommon(masm);                    \
  }
  CODE_AGE_LIST(DEFINE_CODE_AGE_BUILTIN_GENERATOR)
  #undef DEFINE_CODE_AGE_BUILTIN_GENERATOR
  
  
  void Builtins::Generate_MarkCodeAsExecutedOnce(MacroAssembler* masm) {
    // For now, as in GenerateMakeCodeYoungAgainCommon, we are relying on the fact
    // that make_code_young doesn't do any garbage collection which allows us to
    // save/restore the registers without worrying about which of them contain
    // pointers.
    __ pushad();
    __ mov(eax, Operand(esp, 8 * kPointerSize));
    __ sub(eax, Immediate(Assembler::kCallInstructionLength));
    {  // NOLINT
      FrameScope scope(masm, StackFrame::MANUAL);
      __ PrepareCallCFunction(2, ebx);
      __ mov(Operand(esp, 1 * kPointerSize),
             Immediate(ExternalReference::isolate_address(masm->isolate())));
      __ mov(Operand(esp, 0), eax);
      __ CallCFunction(
          ExternalReference::get_mark_code_as_executed_function(masm->isolate()),
          2);
    }
    __ popad();
  
    // Perform prologue operations usually performed by the young code stub.
    __ pop(eax);   // Pop return address into scratch register.
    __ push(ebp);  // Caller's frame pointer.
    __ mov(ebp, esp);
    __ push(esi);  // Callee's context.
    __ push(edi);  // Callee's JS Function.
    __ push(eax);  // Push return address after frame prologue.
  
    // Jump to point after the code-age stub.
    __ ret(0);
  }
  
  
  void Builtins::Generate_MarkCodeAsExecutedTwice(MacroAssembler* masm) {
    GenerateMakeCodeYoungAgainCommon(masm);
  }
  
  
  void Builtins::Generate_MarkCodeAsToBeExecutedOnce(MacroAssembler* masm) {
    Generate_MarkCodeAsExecutedOnce(masm);
  }
  
  
  static void Generate_NotifyStubFailureHelper(MacroAssembler* masm,
                                               SaveFPRegsMode save_doubles) {
    // Enter an internal frame.
    {
      FrameScope scope(masm, StackFrame::INTERNAL);
  
      // Preserve registers across notification, this is important for compiled
      // stubs that tail call the runtime on deopts passing their parameters in
      // registers.
      __ pushad();
      __ CallRuntime(Runtime::kNotifyStubFailure, save_doubles);
      __ popad();
      // Tear down internal frame.
    }
  
    __ pop(MemOperand(esp, 0));  // Ignore state offset
    __ ret(0);  // Return to IC Miss stub, continuation still on stack.
  }
  
  
  void Builtins::Generate_NotifyStubFailure(MacroAssembler* masm) {
    Generate_NotifyStubFailureHelper(masm, kDontSaveFPRegs);
  }
  
  
  void Builtins::Generate_NotifyStubFailureSaveDoubles(MacroAssembler* masm) {
    Generate_NotifyStubFailureHelper(masm, kSaveFPRegs);
  }
  
  
  static void Generate_NotifyDeoptimizedHelper(MacroAssembler* masm,
                                               Deoptimizer::BailoutType type) {
    {
      FrameScope scope(masm, StackFrame::INTERNAL);
  
      // Pass deoptimization type to the runtime system.
      __ push(Immediate(Smi::FromInt(static_cast<int>(type))));
      __ CallRuntime(Runtime::kNotifyDeoptimized);
  
      // Tear down internal frame.
    }
  
    // Get the full codegen state from the stack and untag it.
    __ mov(ecx, Operand(esp, 1 * kPointerSize));
    __ SmiUntag(ecx);
  
    // Switch on the state.
    Label not_no_registers, not_tos_eax;
    __ cmp(ecx, FullCodeGenerator::NO_REGISTERS);
    __ j(not_equal, &not_no_registers, Label::kNear);
    __ ret(1 * kPointerSize);  // Remove state.
  
    __ bind(&not_no_registers);
    __ mov(eax, Operand(esp, 2 * kPointerSize));
    __ cmp(ecx, FullCodeGenerator::TOS_REG);
    __ j(not_equal, &not_tos_eax, Label::kNear);
    __ ret(2 * kPointerSize);  // Remove state, eax.
  
    __ bind(&not_tos_eax);
    __ Abort(kNoCasesLeft);
  }
  
  
  void Builtins::Generate_NotifyDeoptimized(MacroAssembler* masm) {
    Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::EAGER);
  }
  
  
  void Builtins::Generate_NotifySoftDeoptimized(MacroAssembler* masm) {
    Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::SOFT);
  }
  
  
  void Builtins::Generate_NotifyLazyDeoptimized(MacroAssembler* masm) {
    Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::LAZY);
  }
  
  
  // static
  void Builtins::Generate_DatePrototype_GetField(MacroAssembler* masm,
                                                 int field_index) {
    // ----------- S t a t e -------------
    //  -- esp[0] : return address
    //  -- esp[4] : receiver
    // -----------------------------------
  
    // 1. Load receiver into eax and check that it's actually a JSDate object.
    Label receiver_not_date;
    {
      __ mov(eax, Operand(esp, kPointerSize));
      __ JumpIfSmi(eax, &receiver_not_date);
      __ CmpObjectType(eax, JS_DATE_TYPE, ebx);
      __ j(not_equal, &receiver_not_date);
    }
  
    // 2. Load the specified date field, falling back to the runtime as necessary.
    if (field_index == JSDate::kDateValue) {
      __ mov(eax, FieldOperand(eax, JSDate::kValueOffset));
    } else {
      if (field_index < JSDate::kFirstUncachedField) {
        Label stamp_mismatch;
        __ mov(edx, Operand::StaticVariable(
                        ExternalReference::date_cache_stamp(masm->isolate())));
        __ cmp(edx, FieldOperand(eax, JSDate::kCacheStampOffset));
        __ j(not_equal, &stamp_mismatch, Label::kNear);
        __ mov(eax, FieldOperand(
                        eax, JSDate::kValueOffset + field_index * kPointerSize));
        __ ret(1 * kPointerSize);
        __ bind(&stamp_mismatch);
      }
      FrameScope scope(masm, StackFrame::INTERNAL);
      __ PrepareCallCFunction(2, ebx);
      __ mov(Operand(esp, 0), eax);
      __ mov(Operand(esp, 1 * kPointerSize),
             Immediate(Smi::FromInt(field_index)));
      __ CallCFunction(
          ExternalReference::get_date_field_function(masm->isolate()), 2);
    }
    __ ret(1 * kPointerSize);
  
    // 3. Raise a TypeError if the receiver is not a date.
    __ bind(&receiver_not_date);
    {
      FrameScope scope(masm, StackFrame::MANUAL);
      __ EnterFrame(StackFrame::INTERNAL);
      __ CallRuntime(Runtime::kThrowNotDateError);
    }
  }
  
  // static
  void Builtins::Generate_FunctionHasInstance(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax    : argc
    //  -- esp[0] : return address
    //  -- esp[4] : first argument (left-hand side)
    //  -- esp[8] : receiver (right-hand side)
    // -----------------------------------
  
    {
      FrameScope scope(masm, StackFrame::INTERNAL);
      __ mov(InstanceOfDescriptor::LeftRegister(),
             Operand(ebp, 2 * kPointerSize));  // Load left-hand side.
      __ mov(InstanceOfDescriptor::RightRegister(),
             Operand(ebp, 3 * kPointerSize));  // Load right-hand side.
      InstanceOfStub stub(masm->isolate(), true);
      __ CallStub(&stub);
    }
  
    // Pop the argument and the receiver.
    __ ret(2 * kPointerSize);
  }
  
  // static
  void Builtins::Generate_FunctionPrototypeApply(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);
      }
      __ 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),
              Immediate(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);
    }
  }
  
  
  // static
  void Builtins::Generate_FunctionPrototypeCall(MacroAssembler* masm) {
    // Stack Layout:
    // esp[0]           : Return address
    // esp[8]           : Argument n
    // esp[16]          : Argument n-1
    //  ...
    // esp[8 * n]       : Argument 1
    // esp[8 * (n + 1)] : Receiver (callable to call)
    //
    // eax contains the number of arguments, n, not counting the receiver.
    //
    // 1. Make sure we have at least one argument.
    {
      Label done;
      __ test(eax, eax);
      __ j(not_zero, &done, Label::kNear);
      __ PopReturnAddressTo(ebx);
      __ PushRoot(Heap::kUndefinedValueRootIndex);
      __ PushReturnAddressFrom(ebx);
      __ inc(eax);
      __ bind(&done);
    }
  
    // 2. Get the callable to call (passed as receiver) from the stack.
    __ mov(edi, Operand(esp, eax, times_pointer_size, kPointerSize));
  
    // 3. Shift arguments and return address one slot down on the stack
    //    (overwriting the original receiver).  Adjust argument count to make
    //    the original first argument the new receiver.
    {
      Label loop;
      __ mov(ecx, eax);
      __ bind(&loop);
      __ mov(ebx, Operand(esp, ecx, times_pointer_size, 0));
      __ mov(Operand(esp, ecx, times_pointer_size, kPointerSize), ebx);
      __ dec(ecx);
      __ 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);
  }
  
  
  void Builtins::Generate_ReflectApply(MacroAssembler* masm) {
    // ----------- 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),
              Immediate(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);
    }
  }
  
  void Builtins::Generate_ReflectConstruct(MacroAssembler* 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),
              Immediate(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),
              Immediate(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);
    }
  
    // 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);
    }
  }
  
  
  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);
  
    if (FLAG_debug_code) {
      // Initial map for the builtin InternalArray function should be a map.
      __ mov(ebx, FieldOperand(edi, JSFunction::kPrototypeOrInitialMapOffset));
      // Will both indicate a NULL and a Smi.
      __ test(ebx, Immediate(kSmiTagMask));
      __ Assert(not_zero, kUnexpectedInitialMapForInternalArrayFunction);
      __ CmpObjectType(ebx, MAP_TYPE, ecx);
      __ Assert(equal, kUnexpectedInitialMapForInternalArrayFunction);
    }
  
    // Run the native code for the InternalArray function called as a normal
    // function.
    // tail call a stub
    InternalArrayConstructorStub stub(masm->isolate());
    __ TailCallStub(&stub);
  }
  
  
  void Builtins::Generate_ArrayCode(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax : argc
    //  -- esp[0] : return address
    //  -- esp[4] : last argument
    // -----------------------------------
    Label generic_array_code;
  
    // Get the Array function.
    __ LoadGlobalFunction(Context::ARRAY_FUNCTION_INDEX, edi);
    __ mov(edx, edi);
  
    if (FLAG_debug_code) {
      // Initial map for the builtin Array function should be a map.
      __ mov(ebx, FieldOperand(edi, JSFunction::kPrototypeOrInitialMapOffset));
      // Will both indicate a NULL and a Smi.
      __ test(ebx, Immediate(kSmiTagMask));
      __ Assert(not_zero, kUnexpectedInitialMapForArrayFunction);
      __ CmpObjectType(ebx, MAP_TYPE, ecx);
      __ Assert(equal, kUnexpectedInitialMapForArrayFunction);
    }
  
    // Run the native code for the Array function called as a normal function.
    // tail call a stub
    __ mov(ebx, masm->isolate()->factory()->undefined_value());
    ArrayConstructorStub stub(masm->isolate());
    __ TailCallStub(&stub);
  }
  
  
  // static
  void Builtins::Generate_MathMaxMin(MacroAssembler* masm, MathMaxMinKind kind) {
    // ----------- S t a t e -------------
    //  -- eax                 : number of arguments
    //  -- esp[0]              : return address
    //  -- esp[(argc - n) * 8] : arg[n] (zero-based)
    //  -- esp[(argc + 1) * 8] : receiver
    // -----------------------------------
    Condition const cc = (kind == MathMaxMinKind::kMin) ? below : above;
    Heap::RootListIndex const root_index =
        (kind == MathMaxMinKind::kMin) ? Heap::kInfinityValueRootIndex
                                       : Heap::kMinusInfinityValueRootIndex;
    const int reg_sel = (kind == MathMaxMinKind::kMin) ? 1 : 0;
  
    // Load the accumulator with the default return value (either -Infinity or
    // +Infinity), with the tagged value in edx and the double value in stx_0.
    __ LoadRoot(edx, root_index);
    __ fld_d(FieldOperand(edx, HeapNumber::kValueOffset));
    __ Move(ecx, eax);
  
    Label done_loop, loop;
    __ bind(&loop);
    {
      // Check if all parameters done.
      __ test(ecx, ecx);
      __ j(zero, &done_loop);
  
      // Load the next parameter tagged value into ebx.
      __ mov(ebx, Operand(esp, ecx, times_pointer_size, 0));
  
      // Load the double value of the parameter into stx_1, maybe converting the
      // parameter to a number first using the ToNumberStub if necessary.
      Label convert, convert_smi, convert_number, done_convert;
      __ bind(&convert);
      __ JumpIfSmi(ebx, &convert_smi);
      __ JumpIfRoot(FieldOperand(ebx, HeapObject::kMapOffset),
                    Heap::kHeapNumberMapRootIndex, &convert_number);
      {
        // Parameter is not a Number, use the ToNumberStub to convert it.
        FrameScope scope(masm, StackFrame::INTERNAL);
        __ SmiTag(eax);
        __ SmiTag(ecx);
        __ Push(eax);
        __ Push(ecx);
        __ Push(edx);
        __ mov(eax, ebx);
        ToNumberStub stub(masm->isolate());
        __ CallStub(&stub);
        __ mov(ebx, eax);
        __ Pop(edx);
        __ Pop(ecx);
        __ Pop(eax);
        {
          // Restore the double accumulator value (stX_0).
          Label restore_smi, done_restore;
          __ JumpIfSmi(edx, &restore_smi, Label::kNear);
          __ fld_d(FieldOperand(edx, HeapNumber::kValueOffset));
          __ jmp(&done_restore, Label::kNear);
          __ bind(&restore_smi);
          __ SmiUntag(edx);
          __ push(edx);
          __ fild_s(Operand(esp, 0));
          __ pop(edx);
          __ SmiTag(edx);
          __ bind(&done_restore);
        }
        __ SmiUntag(ecx);
        __ SmiUntag(eax);
      }
      __ jmp(&convert);
      __ bind(&convert_number);
      // Load another value into stx_1
      __ fld_d(FieldOperand(ebx, HeapNumber::kValueOffset));
      __ fxch();
      __ jmp(&done_convert, Label::kNear);
      __ bind(&convert_smi);
      __ SmiUntag(ebx);
      __ push(ebx);
      __ fild_s(Operand(esp, 0));
      __ pop(ebx);
      __ fxch();
      __ SmiTag(ebx);
      __ bind(&done_convert);
  
      // Perform the actual comparison with the accumulator value on the left hand
      // side (stx_0) and the next parameter value on the right hand side (stx_1).
      Label compare_equal, compare_nan, compare_swap, done_compare;
  
      // Duplicates the 2 float data for FCmp
      __ fld(1);
      __ fld(1);
      __ FCmp();
      __ j(parity_even, &compare_nan, Label::kNear);
      __ j(cc, &done_compare, Label::kNear);
      __ j(equal, &compare_equal, Label::kNear);
  
      // Result is on the right hand side(stx_0).
      __ bind(&compare_swap);
      __ fxch();
      __ mov(edx, ebx);
      __ jmp(&done_compare, Label::kNear);
  
      // At least one side is NaN, which means that the result will be NaN too.
      __ bind(&compare_nan);
      // Set the result on the right hand side (stx_0) to nan
      __ fstp(0);
      __ LoadRoot(edx, Heap::kNanValueRootIndex);
      __ fld_d(FieldOperand(edx, HeapNumber::kValueOffset));
      __ jmp(&done_compare, Label::kNear);
  
      // Left and right hand side are equal, check for -0 vs. +0.
      __ bind(&compare_equal);
      // Check the sign of the value in reg_sel
      __ fld(reg_sel);
      __ FXamSign();
      __ j(not_zero, &compare_swap);
  
      __ bind(&done_compare);
      // The right result is on the right hand side(stx_0)
      // and can remove the useless stx_1 now.
      __ fxch();
      __ fstp(0);
      __ dec(ecx);
      __ jmp(&loop);
    }
  
    __ bind(&done_loop);
    __ PopReturnAddressTo(ecx);
    __ lea(esp, Operand(esp, eax, times_pointer_size, kPointerSize));
    __ PushReturnAddressFrom(ecx);
    __ mov(eax, edx);
    __ Ret();
  }
  
  // static
  void Builtins::Generate_NumberConstructor(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax                 : number of arguments
    //  -- edi                 : constructor function
    //  -- esp[0]              : return address
    //  -- esp[(argc - n) * 4] : arg[n] (zero-based)
    //  -- esp[(argc + 1) * 4] : receiver
    // -----------------------------------
  
    // 1. Load the first argument into eax and get rid of the rest (including the
    // receiver).
    Label no_arguments;
    {
      __ test(eax, eax);
      __ j(zero, &no_arguments, Label::kNear);
      __ mov(ebx, Operand(esp, eax, times_pointer_size, 0));
      __ PopReturnAddressTo(ecx);
      __ lea(esp, Operand(esp, eax, times_pointer_size, kPointerSize));
      __ PushReturnAddressFrom(ecx);
      __ mov(eax, ebx);
    }
  
    // 2a. Convert the first argument to a number.
    ToNumberStub stub(masm->isolate());
    __ TailCallStub(&stub);
  
    // 2b. No arguments, return +0 (already in eax).
    __ bind(&no_arguments);
    __ ret(1 * kPointerSize);
  }
  
  
  // static
  void Builtins::Generate_NumberConstructor_ConstructStub(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax                 : number of arguments
    //  -- edi                 : constructor function
    //  -- edx                 : new target
    //  -- esp[0]              : return address
    //  -- esp[(argc - n) * 4] : arg[n] (zero-based)
    //  -- esp[(argc + 1) * 4] : receiver
    // -----------------------------------
  
    // 1. Make sure we operate in the context of the called function.
    __ mov(esi, FieldOperand(edi, JSFunction::kContextOffset));
  
    // 2. Load the first argument into ebx and get rid of the rest (including the
    // receiver).
    {
      Label no_arguments, done;
      __ test(eax, eax);
      __ j(zero, &no_arguments, Label::kNear);
      __ mov(ebx, Operand(esp, eax, times_pointer_size, 0));
      __ jmp(&done, Label::kNear);
      __ bind(&no_arguments);
      __ Move(ebx, Smi::FromInt(0));
      __ bind(&done);
      __ PopReturnAddressTo(ecx);
      __ lea(esp, Operand(esp, eax, times_pointer_size, kPointerSize));
      __ PushReturnAddressFrom(ecx);
    }
  
    // 3. Make sure ebx is a number.
    {
      Label done_convert;
      __ JumpIfSmi(ebx, &done_convert);
      __ CompareRoot(FieldOperand(ebx, HeapObject::kMapOffset),
                     Heap::kHeapNumberMapRootIndex);
      __ j(equal, &done_convert);
      {
        FrameScope scope(masm, StackFrame::INTERNAL);
        __ Push(edi);
        __ Push(edx);
        __ Move(eax, ebx);
        ToNumberStub stub(masm->isolate());
        __ CallStub(&stub);
        __ Move(ebx, eax);
        __ Pop(edx);
        __ Pop(edi);
      }
      __ bind(&done_convert);
    }
  
    // 4. Check if new target and constructor differ.
    Label new_object;
    __ cmp(edx, edi);
    __ j(not_equal, &new_object);
  
    // 5. Allocate a JSValue wrapper for the number.
    __ AllocateJSValue(eax, edi, ebx, ecx, &new_object);
    __ Ret();
  
    // 6. Fallback to the runtime to create new object.
    __ bind(&new_object);
    {
      FrameScope scope(masm, StackFrame::INTERNAL);
      __ Push(ebx);  // the first argument
      FastNewObjectStub stub(masm->isolate());
      __ CallStub(&stub);
      __ Pop(FieldOperand(eax, JSValue::kValueOffset));
    }
    __ Ret();
  }
  
  
  // static
  void Builtins::Generate_StringConstructor(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax                 : number of arguments
    //  -- edi                 : constructor function
    //  -- esp[0]              : return address
    //  -- esp[(argc - n) * 4] : arg[n] (zero-based)
    //  -- esp[(argc + 1) * 4] : receiver
    // -----------------------------------
  
    // 1. Load the first argument into eax and get rid of the rest (including the
    // receiver).
    Label no_arguments;
    {
      __ test(eax, eax);
      __ j(zero, &no_arguments, Label::kNear);
      __ mov(ebx, Operand(esp, eax, times_pointer_size, 0));
      __ PopReturnAddressTo(ecx);
      __ lea(esp, Operand(esp, eax, times_pointer_size, kPointerSize));
      __ PushReturnAddressFrom(ecx);
      __ mov(eax, ebx);
    }
  
    // 2a. At least one argument, return eax if it's a string, otherwise
    // dispatch to appropriate conversion.
    Label to_string, symbol_descriptive_string;
    {
      __ JumpIfSmi(eax, &to_string, Label::kNear);
      STATIC_ASSERT(FIRST_NONSTRING_TYPE == SYMBOL_TYPE);
      __ CmpObjectType(eax, FIRST_NONSTRING_TYPE, edx);
      __ j(above, &to_string, Label::kNear);
      __ j(equal, &symbol_descriptive_string, Label::kNear);
      __ Ret();
    }
  
    // 2b. No arguments, return the empty string (and pop the receiver).
    __ bind(&no_arguments);
    {
      __ LoadRoot(eax, Heap::kempty_stringRootIndex);
      __ ret(1 * kPointerSize);
    }
  
    // 3a. Convert eax to a string.
    __ bind(&to_string);
    {
      ToStringStub stub(masm->isolate());
      __ TailCallStub(&stub);
    }
  
    // 3b. Convert symbol in eax to a string.
    __ bind(&symbol_descriptive_string);
    {
      __ PopReturnAddressTo(ecx);
      __ Push(eax);
      __ PushReturnAddressFrom(ecx);
      __ TailCallRuntime(Runtime::kSymbolDescriptiveString);
    }
  }
  
  
  // static
  void Builtins::Generate_StringConstructor_ConstructStub(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax                 : number of arguments
    //  -- edi                 : constructor function
    //  -- edx                 : new target
    //  -- esp[0]              : return address
    //  -- esp[(argc - n) * 4] : arg[n] (zero-based)
    //  -- esp[(argc + 1) * 4] : receiver
    // -----------------------------------
  
    // 1. Make sure we operate in the context of the called function.
    __ mov(esi, FieldOperand(edi, JSFunction::kContextOffset));
  
    // 2. Load the first argument into ebx and get rid of the rest (including the
    // receiver).
    {
      Label no_arguments, done;
      __ test(eax, eax);
      __ j(zero, &no_arguments, Label::kNear);
      __ mov(ebx, Operand(esp, eax, times_pointer_size, 0));
      __ jmp(&done, Label::kNear);
      __ bind(&no_arguments);
      __ LoadRoot(ebx, Heap::kempty_stringRootIndex);
      __ bind(&done);
      __ PopReturnAddressTo(ecx);
      __ lea(esp, Operand(esp, eax, times_pointer_size, kPointerSize));
      __ PushReturnAddressFrom(ecx);
    }
  
    // 3. Make sure ebx is a string.
    {
      Label convert, done_convert;
      __ JumpIfSmi(ebx, &convert, Label::kNear);
      __ CmpObjectType(ebx, FIRST_NONSTRING_TYPE, ecx);
      __ j(below, &done_convert);
      __ bind(&convert);
      {
        FrameScope scope(masm, StackFrame::INTERNAL);
        ToStringStub stub(masm->isolate());
        __ Push(edi);
        __ Push(edx);
        __ Move(eax, ebx);
        __ CallStub(&stub);
        __ Move(ebx, eax);
        __ Pop(edx);
        __ Pop(edi);
      }
      __ bind(&done_convert);
    }
  
    // 4. Check if new target and constructor differ.
    Label new_object;
    __ cmp(edx, edi);
    __ j(not_equal, &new_object);
  
    // 5. Allocate a JSValue wrapper for the string.
    __ AllocateJSValue(eax, edi, ebx, ecx, &new_object);
    __ Ret();
  
    // 6. Fallback to the runtime to create new object.
    __ bind(&new_object);
    {
      FrameScope scope(masm, StackFrame::INTERNAL);
      __ Push(ebx);  // the first argument
      FastNewObjectStub stub(masm->isolate());
      __ CallStub(&stub);
      __ Pop(FieldOperand(eax, JSValue::kValueOffset));
    }
    __ Ret();
  }
  
  
  static void ArgumentsAdaptorStackCheck(MacroAssembler* masm,
                                         Label* stack_overflow) {
    // ----------- S t a t e -------------
    //  -- eax : actual number of arguments
    //  -- ebx : expected number of arguments
    //  -- edx : new target (passed through to callee)
    // -----------------------------------
    // Check the stack for overflow. We are not trying to catch
    // interruptions (e.g. debug break and preemption) here, so the "real stack
    // limit" is checked.
    ExternalReference real_stack_limit =
        ExternalReference::address_of_real_stack_limit(masm->isolate());
    __ mov(edi, 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.
    __ mov(ecx, esp);
    __ sub(ecx, edi);
    // Make edi the space we need for the array when it is unrolled onto the
    // stack.
    __ mov(edi, ebx);
    __ shl(edi, kPointerSizeLog2);
    // Check if the arguments will overflow the stack.
    __ cmp(ecx, edi);
    __ j(less_equal, stack_overflow);  // Signed comparison.
  }
  
  
  static void EnterArgumentsAdaptorFrame(MacroAssembler* masm) {
    __ push(ebp);
    __ mov(ebp, esp);
  
    // Store the arguments adaptor context sentinel.
    __ push(Immediate(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
  
    // Push the function on the stack.
    __ push(edi);
  
    // Preserve the number of arguments on the stack. Must preserve eax,
    // ebx and ecx because these registers are used when copying the
    // arguments and the receiver.
    STATIC_ASSERT(kSmiTagSize == 1);
    __ lea(edi, Operand(eax, eax, times_1, kSmiTag));
    __ push(edi);
  }
  
  
  static void LeaveArgumentsAdaptorFrame(MacroAssembler* masm) {
    // Retrieve the number of arguments from the stack.
    __ mov(ebx, Operand(ebp, ArgumentsAdaptorFrameConstants::kLengthOffset));
  
    // Leave the frame.
    __ leave();
  
    // 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);
        __ 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, JSArgumentsObject::kLengthOffset));
      __ 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);
      __ 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).
    {
      __ push(edx);
      __ fld_s(MemOperand(esp, 0));
      __ lea(esp, Operand(esp, kFloatSize));
  
      __ 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);
  
      __ lea(esp, Operand(esp, -kFloatSize));
      __ fstp_s(MemOperand(esp, 0));
      __ pop(edx);
  
      __ 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);
    }
  }
  
  namespace {
  
  // Drops top JavaScript frame and an arguments adaptor frame below it (if
  // present) preserving all the arguments prepared for current call.
  // Does nothing if debugger is currently active.
  // ES6 14.6.3. PrepareForTailCall
  //
  // Stack structure for the function g() tail calling f():
  //
  // ------- Caller frame: -------
  // |  ...
  // |  g()'s arg M
  // |  ...
  // |  g()'s arg 1
  // |  g()'s receiver arg
  // |  g()'s caller pc
  // ------- g()'s frame: -------
  // |  g()'s caller fp      <- fp
  // |  g()'s context
  // |  function pointer: g
  // |  -------------------------
  // |  ...
  // |  ...
  // |  f()'s arg N
  // |  ...
  // |  f()'s arg 1
  // |  f()'s receiver arg
  // |  f()'s caller pc      <- sp
  // ----------------------
  //
  void PrepareForTailCall(MacroAssembler* masm, Register args_reg,
                          Register scratch1, Register scratch2,
                          Register scratch3) {
    DCHECK(!AreAliased(args_reg, scratch1, scratch2, scratch3));
    Comment cmnt(masm, "[ PrepareForTailCall");
  
    // Drop possible interpreter handler/stub frame.
    {
      Label no_interpreter_frame;
      __ cmp(Operand(ebp, CommonFrameConstants::kContextOrFrameTypeOffset),
             Immediate(Smi::FromInt(StackFrame::STUB)));
      __ j(not_equal, &no_interpreter_frame, Label::kNear);
      __ mov(ebp, Operand(ebp, StandardFrameConstants::kCallerFPOffset));
      __ bind(&no_interpreter_frame);
    }
  
    // Check if next frame is an arguments adaptor frame.
    Register caller_args_count_reg = scratch1;
    Label no_arguments_adaptor, formal_parameter_count_loaded;
    __ mov(scratch2, Operand(ebp, StandardFrameConstants::kCallerFPOffset));
    __ cmp(Operand(scratch2, CommonFrameConstants::kContextOrFrameTypeOffset),
           Immediate(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
    __ j(not_equal, &no_arguments_adaptor, Label::kNear);
  
    // Drop current frame and load arguments count from arguments adaptor frame.
    __ mov(ebp, scratch2);
    __ mov(caller_args_count_reg,
           Operand(ebp, ArgumentsAdaptorFrameConstants::kLengthOffset));
    __ SmiUntag(caller_args_count_reg);
    __ jmp(&formal_parameter_count_loaded, Label::kNear);
  
    __ bind(&no_arguments_adaptor);
    // Load caller's formal parameter count
    __ mov(scratch1, Operand(ebp, JavaScriptFrameConstants::kFunctionOffset));
    __ mov(scratch1,
           FieldOperand(scratch1, JSFunction::kSharedFunctionInfoOffset));
    __ mov(
        caller_args_count_reg,
        FieldOperand(scratch1, SharedFunctionInfo::kFormalParameterCountOffset));
    __ SmiUntag(caller_args_count_reg);
  
    __ bind(&formal_parameter_count_loaded);
  
    ParameterCount callee_args_count(args_reg);
    __ PrepareForTailCall(callee_args_count, caller_args_count_reg, scratch2,
                          scratch3, ReturnAddressState::kOnStack, 0);
  }
  }  // namespace
  
  // static
  void Builtins::Generate_CallFunction(MacroAssembler* masm,
                                       ConvertReceiverMode mode,
                                       TailCallMode tail_call_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".
    Label class_constructor;
    __ mov(edx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
    __ test_b(FieldOperand(edx, SharedFunctionInfo::kFunctionKindByteOffset),
              Immediate(SharedFunctionInfo::kClassConstructorBitsWithinByte));
    __ j(not_zero, &class_constructor);
  
    // Enter the context of the function; ToObject has to run in the function
    // context, and we also need to take the global proxy from the function
    // context in case of conversion.
    STATIC_ASSERT(SharedFunctionInfo::kNativeByteOffset ==
                  SharedFunctionInfo::kStrictModeByteOffset);
    __ mov(esi, FieldOperand(edi, JSFunction::kContextOffset));
    // We need to convert the receiver for non-native sloppy mode functions.
    Label done_convert;
    __ test_b(FieldOperand(edx, SharedFunctionInfo::kNativeByteOffset),
              Immediate((1 << SharedFunctionInfo::kNativeBitWithinByte) |
                        (1 << SharedFunctionInfo::kStrictModeBitWithinByte)));
    __ j(not_zero, &done_convert);
    {
      // ----------- S t a t e -------------
      //  -- eax : the number of arguments (not including the receiver)
      //  -- edx : the shared function info.
      //  -- edi : the function to call (checked to be a JSFunction)
      //  -- esi : the function context.
      // -----------------------------------
  
      if (mode == ConvertReceiverMode::kNullOrUndefined) {
        // Patch receiver to global proxy.
        __ LoadGlobalProxy(ecx);
      } else {
        Label convert_to_object, convert_receiver;
        __ mov(ecx, Operand(esp, eax, times_pointer_size, kPointerSize));
        __ JumpIfSmi(ecx, &convert_to_object, Label::kNear);
        STATIC_ASSERT(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
        __ CmpObjectType(ecx, FIRST_JS_RECEIVER_TYPE, ebx);
        __ j(above_equal, &done_convert);
        if (mode != ConvertReceiverMode::kNotNullOrUndefined) {
          Label convert_global_proxy;
          __ JumpIfRoot(ecx, Heap::kUndefinedValueRootIndex,
                        &convert_global_proxy, Label::kNear);
          __ JumpIfNotRoot(ecx, Heap::kNullValueRootIndex, &convert_to_object,
                           Label::kNear);
          __ bind(&convert_global_proxy);
          {
            // Patch receiver to global proxy.
            __ LoadGlobalProxy(ecx);
          }
          __ jmp(&convert_receiver);
        }
        __ bind(&convert_to_object);
        {
          // Convert receiver using ToObject.
          // TODO(bmeurer): Inline the allocation here to avoid building the frame
          // in the fast case? (fall back to AllocateInNewSpace?)
          FrameScope scope(masm, StackFrame::INTERNAL);
          __ SmiTag(eax);
          __ Push(eax);
          __ Push(edi);
          __ mov(eax, ecx);
          ToObjectStub stub(masm->isolate());
          __ CallStub(&stub);
          __ mov(ecx, eax);
          __ Pop(edi);
          __ Pop(eax);
          __ SmiUntag(eax);
        }
        __ mov(edx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
        __ bind(&convert_receiver);
      }
      __ mov(Operand(esp, eax, times_pointer_size, kPointerSize), ecx);
    }
    __ bind(&done_convert);
  
    // ----------- S t a t e -------------
    //  -- eax : the number of arguments (not including the receiver)
    //  -- edx : the shared function info.
    //  -- edi : the function to call (checked to be a JSFunction)
    //  -- esi : the function context.
    // -----------------------------------
  
    if (tail_call_mode == TailCallMode::kAllow) {
      PrepareForTailCall(masm, eax, ebx, ecx, edx);
      // Reload shared function info.
      __ mov(edx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
    }
  
    __ mov(ebx,
           FieldOperand(edx, SharedFunctionInfo::kFormalParameterCountOffset));
    __ SmiUntag(ebx);
    ParameterCount actual(eax);
    ParameterCount expected(ebx);
    __ InvokeFunctionCode(edi, no_reg, expected, actual, JUMP_FUNCTION,
                          CheckDebugStepCallWrapper());
    // The function is a "classConstructor", need to raise an exception.
    __ bind(&class_constructor);
    {
      FrameScope frame(masm, StackFrame::INTERNAL);
      __ push(edi);
      __ CallRuntime(Runtime::kThrowConstructorNonCallableError);
    }
  }
  
  
  namespace {
  
  void Generate_PushBoundArguments(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax : the number of arguments (not including the receiver)
    //  -- edx : new.target (only in case of [[Construct]])
    //  -- edi : target (checked to be a JSBoundFunction)
    // -----------------------------------
  
    // Load [[BoundArguments]] into ecx and length of that into ebx.
    Label no_bound_arguments;
    __ mov(ecx, FieldOperand(edi, JSBoundFunction::kBoundArgumentsOffset));
    __ mov(ebx, FieldOperand(ecx, FixedArray::kLengthOffset));
    __ SmiUntag(ebx);
    __ test(ebx, ebx);
    __ j(zero, &no_bound_arguments);
    {
      // ----------- S t a t e -------------
      //  -- eax : the number of arguments (not including the receiver)
      //  -- edx : new.target (only in case of [[Construct]])
      //  -- edi : target (checked to be a JSBoundFunction)
      //  -- ecx : the [[BoundArguments]] (implemented as FixedArray)
      //  -- ebx : the number of [[BoundArguments]]
      // -----------------------------------
  
      // Reserve stack space for the [[BoundArguments]].
      {
        Label done;
        __ lea(ecx, Operand(ebx, times_pointer_size, 0));
        __ sub(esp, ecx);
        // 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".
        __ CompareRoot(esp, ecx, Heap::kRealStackLimitRootIndex);
        __ j(greater, &done, Label::kNear);  // Signed comparison.
        // Restore the stack pointer.
        __ lea(esp, Operand(esp, ebx, times_pointer_size, 0));
        {
          FrameScope scope(masm, StackFrame::MANUAL);
          __ EnterFrame(StackFrame::INTERNAL);
          __ CallRuntime(Runtime::kThrowStackOverflow);
        }
        __ bind(&done);
      }
  
      // Adjust effective number of arguments to include return address.
      __ inc(eax);
  
      // Relocate arguments and return address down the stack.
      {
        Label loop;
        __ Set(ecx, 0);
        __ lea(ebx, Operand(esp, ebx, times_pointer_size, 0));
        __ bind(&loop);
        __ fld_s(Operand(ebx, ecx, times_pointer_size, 0));
        __ fstp_s(Operand(esp, ecx, times_pointer_size, 0));
        __ inc(ecx);
        __ cmp(ecx, eax);
        __ j(less, &loop);
      }
  
      // Copy [[BoundArguments]] to the stack (below the arguments).
      {
        Label loop;
        __ mov(ecx, FieldOperand(edi, JSBoundFunction::kBoundArgumentsOffset));
        __ mov(ebx, FieldOperand(ecx, FixedArray::kLengthOffset));
        __ SmiUntag(ebx);
        __ bind(&loop);
        __ dec(ebx);
        __ fld_s(
            FieldOperand(ecx, ebx, times_pointer_size, FixedArray::kHeaderSize));
        __ fstp_s(Operand(esp, eax, times_pointer_size, 0));
        __ lea(eax, Operand(eax, 1));
        __ j(greater, &loop);
      }
  
      // Adjust effective number of arguments (eax contains the number of
      // arguments from the call plus return address plus the number of
      // [[BoundArguments]]), so we need to subtract one for the return address.
      __ dec(eax);
    }
    __ bind(&no_bound_arguments);
  }
  
  }  // namespace
  
  
  // static
  void Builtins::Generate_CallBoundFunctionImpl(MacroAssembler* masm,
                                                TailCallMode tail_call_mode) {
    // ----------- S t a t e -------------
    //  -- eax : the number of arguments (not including the receiver)
    //  -- edi : the function to call (checked to be a JSBoundFunction)
    // -----------------------------------
    __ AssertBoundFunction(edi);
  
    if (tail_call_mode == TailCallMode::kAllow) {
      PrepareForTailCall(masm, eax, ebx, ecx, edx);
    }
  
    // Patch the receiver to [[BoundThis]].
    __ mov(ebx, FieldOperand(edi, JSBoundFunction::kBoundThisOffset));
    __ mov(Operand(esp, eax, times_pointer_size, kPointerSize), ebx);
  
    // Push the [[BoundArguments]] onto the stack.
    Generate_PushBoundArguments(masm);
  
    // Call the [[BoundTargetFunction]] via the Call builtin.
    __ mov(edi, FieldOperand(edi, JSBoundFunction::kBoundTargetFunctionOffset));
    __ mov(ecx, Operand::StaticVariable(ExternalReference(
                    Builtins::kCall_ReceiverIsAny, masm->isolate())));
    __ lea(ecx, FieldOperand(ecx, Code::kHeaderSize));
    __ jmp(ecx);
  }
  
  
  // static
  void Builtins::Generate_Call(MacroAssembler* masm, ConvertReceiverMode mode,
                               TailCallMode tail_call_mode) {
    // ----------- S t a t e -------------
    //  -- eax : the number of arguments (not including the receiver)
    //  -- edi : the target to call (can be any Object).
    // -----------------------------------
  
    Label non_callable, non_function, non_smi;
    __ JumpIfSmi(edi, &non_callable);
    __ bind(&non_smi);
    __ CmpObjectType(edi, JS_FUNCTION_TYPE, ecx);
    __ j(equal, masm->isolate()->builtins()->CallFunction(mode, tail_call_mode),
         RelocInfo::CODE_TARGET);
    __ CmpInstanceType(ecx, JS_BOUND_FUNCTION_TYPE);
    __ j(equal, masm->isolate()->builtins()->CallBoundFunction(tail_call_mode),
         RelocInfo::CODE_TARGET);
  
    // Check if target has a [[Call]] internal method.
    __ test_b(FieldOperand(ecx, Map::kBitFieldOffset),
              Immediate(1 << Map::kIsCallable));
    __ j(zero, &non_callable);
  
    __ CmpInstanceType(ecx, JS_PROXY_TYPE);
    __ j(not_equal, &non_function);
  
    // 0. Prepare for tail call if necessary.
    if (tail_call_mode == TailCallMode::kAllow) {
      PrepareForTailCall(masm, eax, ebx, ecx, edx);
    }
  
    // 1. Runtime fallback for Proxy [[Call]].
    __ PopReturnAddressTo(ecx);
    __ Push(edi);
    __ PushReturnAddressFrom(ecx);
    // Increase the arguments size to include the pushed function and the
    // existing receiver on the stack.
    __ add(eax, Immediate(2));
    // Tail-call to the runtime.
    __ JumpToExternalReference(
        ExternalReference(Runtime::kJSProxyCall, masm->isolate()));
  
    // 2. Call to something else, which might have a [[Call]] internal method (if
    // not we raise an exception).
    __ bind(&non_function);
    // Overwrite the original receiver with the (original) target.
    __ mov(Operand(esp, eax, times_pointer_size, kPointerSize), edi);
    // Let the "call_as_function_delegate" take care of the rest.
    __ LoadGlobalFunction(Context::CALL_AS_FUNCTION_DELEGATE_INDEX, edi);
    __ Jump(masm->isolate()->builtins()->CallFunction(
                ConvertReceiverMode::kNotNullOrUndefined, tail_call_mode),
            RelocInfo::CODE_TARGET);
  
    // 3. Call to something that is not callable.
    __ bind(&non_callable);
    {
      FrameScope scope(masm, StackFrame::INTERNAL);
      __ Push(edi);
      __ CallRuntime(Runtime::kThrowCalledNonCallable);
    }
  }
  
  
  // static
  void Builtins::Generate_ConstructFunction(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax : the number of arguments (not including the receiver)
    //  -- edx : the new target (checked to be a constructor)
    //  -- edi : the constructor to call (checked to be a JSFunction)
    // -----------------------------------
    __ AssertFunction(edi);
  
    // Calling convention for function specific ConstructStubs require
    // ebx to contain either an AllocationSite or undefined.
    __ LoadRoot(ebx, Heap::kUndefinedValueRootIndex);
  
    // Tail call to the function-specific construct stub (still in the caller
    // context at this point).
    __ mov(ecx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
    __ mov(ecx, FieldOperand(ecx, SharedFunctionInfo::kConstructStubOffset));
    __ lea(ecx, FieldOperand(ecx, Code::kHeaderSize));
    __ jmp(ecx);
  }
  
  
  // static
  void Builtins::Generate_ConstructBoundFunction(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax : the number of arguments (not including the receiver)
    //  -- edx : the new target (checked to be a constructor)
    //  -- edi : the constructor to call (checked to be a JSBoundFunction)
    // -----------------------------------
    __ AssertBoundFunction(edi);
  
    // Push the [[BoundArguments]] onto the stack.
    Generate_PushBoundArguments(masm);
  
    // Patch new.target to [[BoundTargetFunction]] if new.target equals target.
    {
      Label done;
      __ cmp(edi, edx);
      __ j(not_equal, &done, Label::kNear);
      __ mov(edx, FieldOperand(edi, JSBoundFunction::kBoundTargetFunctionOffset));
      __ bind(&done);
    }
  
    // Construct the [[BoundTargetFunction]] via the Construct builtin.
    __ mov(edi, FieldOperand(edi, JSBoundFunction::kBoundTargetFunctionOffset));
    __ mov(ecx, Operand::StaticVariable(
                    ExternalReference(Builtins::kConstruct, masm->isolate())));
    __ lea(ecx, FieldOperand(ecx, Code::kHeaderSize));
    __ jmp(ecx);
  }
  
  
  // static
  void Builtins::Generate_ConstructProxy(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax : the number of arguments (not including the receiver)
    //  -- edi : the constructor to call (checked to be a JSProxy)
    //  -- edx : the new target (either the same as the constructor or
    //           the JSFunction on which new was invoked initially)
    // -----------------------------------
  
    // Call into the Runtime for Proxy [[Construct]].
    __ PopReturnAddressTo(ecx);
    __ Push(edi);
    __ Push(edx);
    __ PushReturnAddressFrom(ecx);
    // Include the pushed new_target, constructor and the receiver.
    __ add(eax, Immediate(3));
    // Tail-call to the runtime.
    __ JumpToExternalReference(
        ExternalReference(Runtime::kJSProxyConstruct, masm->isolate()));
  }
  
  
  // static
  void Builtins::Generate_Construct(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax : the number of arguments (not including the receiver)
    //  -- edx : the new target (either the same as the constructor or
    //           the JSFunction on which new was invoked initially)
    //  -- edi : the constructor to call (can be any Object)
    // -----------------------------------
  
    // Check if target is a Smi.
    Label non_constructor;
    __ JumpIfSmi(edi, &non_constructor, Label::kNear);
  
    // Dispatch based on instance type.
    __ CmpObjectType(edi, JS_FUNCTION_TYPE, ecx);
    __ j(equal, masm->isolate()->builtins()->ConstructFunction(),
         RelocInfo::CODE_TARGET);
  
    // Check if target has a [[Construct]] internal method.
    __ test_b(FieldOperand(ecx, Map::kBitFieldOffset),
              Immediate(1 << Map::kIsConstructor));
    __ j(zero, &non_constructor, Label::kNear);
  
    // Only dispatch to bound functions after checking whether they are
    // constructors.
    __ CmpInstanceType(ecx, JS_BOUND_FUNCTION_TYPE);
    __ j(equal, masm->isolate()->builtins()->ConstructBoundFunction(),
         RelocInfo::CODE_TARGET);
  
    // Only dispatch to proxies after checking whether they are constructors.
    __ CmpInstanceType(ecx, JS_PROXY_TYPE);
    __ j(equal, masm->isolate()->builtins()->ConstructProxy(),
         RelocInfo::CODE_TARGET);
  
    // Called Construct on an exotic Object with a [[Construct]] internal method.
    {
      // Overwrite the original receiver with the (original) target.
      __ mov(Operand(esp, eax, times_pointer_size, kPointerSize), edi);
      // Let the "call_as_constructor_delegate" take care of the rest.
      __ LoadGlobalFunction(Context::CALL_AS_CONSTRUCTOR_DELEGATE_INDEX, edi);
      __ Jump(masm->isolate()->builtins()->CallFunction(),
              RelocInfo::CODE_TARGET);
    }
  
    // Called Construct on an Object that doesn't have a [[Construct]] internal
    // method.
    __ bind(&non_constructor);
    __ Jump(masm->isolate()->builtins()->ConstructedNonConstructable(),
            RelocInfo::CODE_TARGET);
  }
  
  
  void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax : actual number of arguments
    //  -- ebx : expected number of arguments
    //  -- edx : new target (passed through to callee)
    //  -- edi : function (passed through to callee)
    // -----------------------------------
  
    Label invoke, dont_adapt_arguments, stack_overflow;
    __ IncrementCounter(masm->isolate()->counters()->arguments_adaptors(), 1);
  
    Label enough, too_few;
    __ cmp(eax, ebx);
    __ j(less, &too_few);
    __ cmp(ebx, SharedFunctionInfo::kDontAdaptArgumentsSentinel);
    __ j(equal, &dont_adapt_arguments);
  
    {  // Enough parameters: Actual >= expected.
      __ bind(&enough);
      EnterArgumentsAdaptorFrame(masm);
      ArgumentsAdaptorStackCheck(masm, &stack_overflow);
  
      // Copy receiver and all expected arguments.
      const int offset = StandardFrameConstants::kCallerSPOffset;
      __ lea(edi, Operand(ebp, eax, times_4, offset));
      __ mov(eax, -1);  // account for receiver
  
      Label copy;
      __ bind(&copy);
      __ inc(eax);
      __ push(Operand(edi, 0));
      __ sub(edi, Immediate(kPointerSize));
      __ cmp(eax, ebx);
      __ j(less, &copy);
      // eax now contains the expected number of arguments.
      __ jmp(&invoke);
    }
  
    {  // Too few parameters: Actual < expected.
      __ bind(&too_few);
  
      EnterArgumentsAdaptorFrame(masm);
      ArgumentsAdaptorStackCheck(masm, &stack_overflow);
  
      // Remember expected arguments in ecx.
      __ mov(ecx, ebx);
  
      // Copy receiver and all actual arguments.
      const int offset = StandardFrameConstants::kCallerSPOffset;
      __ lea(edi, Operand(ebp, eax, times_4, offset));
      // ebx = expected - actual.
      __ sub(ebx, eax);
      // eax = -actual - 1
      __ neg(eax);
      __ sub(eax, Immediate(1));
  
      Label copy;
      __ bind(&copy);
      __ inc(eax);
      __ push(Operand(edi, 0));
      __ sub(edi, Immediate(kPointerSize));
      __ test(eax, eax);
      __ j(not_zero, &copy);
  
      // Fill remaining expected arguments with undefined values.
      Label fill;
      __ bind(&fill);
      __ inc(eax);
      __ push(Immediate(masm->isolate()->factory()->undefined_value()));
      __ cmp(eax, ebx);
      __ j(less, &fill);
  
      // Restore expected arguments.
      __ mov(eax, ecx);
    }
  
    // Call the entry point.
    __ bind(&invoke);
    // Restore function pointer.
    __ mov(edi, Operand(ebp, ArgumentsAdaptorFrameConstants::kFunctionOffset));
    // eax : expected number of arguments
    // edx : new target (passed through to callee)
    // edi : function (passed through to callee)
    __ mov(ecx, FieldOperand(edi, JSFunction::kCodeEntryOffset));
    __ call(ecx);
  
    // Store offset of return address for deoptimizer.
    masm->isolate()->heap()->SetArgumentsAdaptorDeoptPCOffset(masm->pc_offset());
  
    // Leave frame and return.
    LeaveArgumentsAdaptorFrame(masm);
    __ ret(0);
  
    // -------------------------------------------
    // Dont adapt arguments.
    // -------------------------------------------
    __ bind(&dont_adapt_arguments);
    __ mov(ecx, FieldOperand(edi, JSFunction::kCodeEntryOffset));
    __ jmp(ecx);
  
    __ bind(&stack_overflow);
    {
      FrameScope frame(masm, StackFrame::MANUAL);
      __ CallRuntime(Runtime::kThrowStackOverflow);
      __ int3();
    }
  }
  
  
  static void CompatibleReceiverCheck(MacroAssembler* masm, Register receiver,
                                      Register function_template_info,
                                      Register scratch0, Register scratch1,
                                      Label* receiver_check_failed) {
    // If there is no signature, return the holder.
    __ CompareRoot(FieldOperand(function_template_info,
                                FunctionTemplateInfo::kSignatureOffset),
                   Heap::kUndefinedValueRootIndex);
    Label receiver_check_passed;
    __ j(equal, &receiver_check_passed, Label::kNear);
  
    // Walk the prototype chain.
    __ mov(scratch0, FieldOperand(receiver, HeapObject::kMapOffset));
    Label prototype_loop_start;
    __ bind(&prototype_loop_start);
  
    // Get the constructor, if any.
    __ GetMapConstructor(scratch0, scratch0, scratch1);
    __ CmpInstanceType(scratch1, JS_FUNCTION_TYPE);
    Label next_prototype;
    __ j(not_equal, &next_prototype, Label::kNear);
  
    // Get the constructor's signature.
    __ mov(scratch0,
           FieldOperand(scratch0, JSFunction::kSharedFunctionInfoOffset));
    __ mov(scratch0,
           FieldOperand(scratch0, SharedFunctionInfo::kFunctionDataOffset));
  
    // Loop through the chain of inheriting function templates.
    Label function_template_loop;
    __ bind(&function_template_loop);
  
    // If the signatures match, we have a compatible receiver.
    __ cmp(scratch0, FieldOperand(function_template_info,
                                  FunctionTemplateInfo::kSignatureOffset));
    __ j(equal, &receiver_check_passed, Label::kNear);
  
    // If the current type is not a FunctionTemplateInfo, load the next prototype
    // in the chain.
    __ JumpIfSmi(scratch0, &next_prototype, Label::kNear);
    __ CmpObjectType(scratch0, FUNCTION_TEMPLATE_INFO_TYPE, scratch1);
    __ j(not_equal, &next_prototype, Label::kNear);
  
    // Otherwise load the parent function template and iterate.
    __ mov(scratch0,
           FieldOperand(scratch0, FunctionTemplateInfo::kParentTemplateOffset));
    __ jmp(&function_template_loop, Label::kNear);
  
    // Load the next prototype.
    __ bind(&next_prototype);
    __ mov(receiver, FieldOperand(receiver, HeapObject::kMapOffset));
    __ test(FieldOperand(receiver, Map::kBitField3Offset),
            Immediate(Map::HasHiddenPrototype::kMask));
    __ j(zero, receiver_check_failed);
  
    __ mov(receiver, FieldOperand(receiver, Map::kPrototypeOffset));
    __ mov(scratch0, FieldOperand(receiver, HeapObject::kMapOffset));
    // Iterate.
    __ jmp(&prototype_loop_start, Label::kNear);
  
    __ bind(&receiver_check_passed);
  }
  
  
  void Builtins::Generate_HandleFastApiCall(MacroAssembler* masm) {
    // ----------- S t a t e -------------
    //  -- eax                : number of arguments (not including the receiver)
    //  -- edi                : callee
    //  -- esi                : context
    //  -- esp[0]             : return address
    //  -- esp[4]             : last argument
    //  -- ...
    //  -- esp[eax * 4]       : first argument
    //  -- esp[(eax + 1) * 4] : receiver
    // -----------------------------------
  
    // Load the FunctionTemplateInfo.
    __ mov(ebx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
    __ mov(ebx, FieldOperand(ebx, SharedFunctionInfo::kFunctionDataOffset));
  
    // Do the compatible receiver check.
    Label receiver_check_failed;
    __ mov(ecx, Operand(esp, eax, times_pointer_size, kPCOnStackSize));
    __ Push(eax);
    CompatibleReceiverCheck(masm, ecx, ebx, edx, eax, &receiver_check_failed);
    __ Pop(eax);
    // Get the callback offset from the FunctionTemplateInfo, and jump to the
    // beginning of the code.
    __ mov(edx, FieldOperand(ebx, FunctionTemplateInfo::kCallCodeOffset));
    __ mov(edx, FieldOperand(edx, CallHandlerInfo::kFastHandlerOffset));
    __ add(edx, Immediate(Code::kHeaderSize - kHeapObjectTag));
    __ jmp(edx);
  
    // Compatible receiver check failed: pop return address, arguments and
    // receiver and throw an Illegal Invocation exception.
    __ bind(&receiver_check_failed);
    __ Pop(eax);
    __ PopReturnAddressTo(ebx);
    __ lea(eax, Operand(eax, times_pointer_size, 1 * kPointerSize));
    __ add(esp, eax);
    __ PushReturnAddressFrom(ebx);
    {
      FrameScope scope(masm, StackFrame::INTERNAL);
      __ TailCallRuntime(Runtime::kThrowIllegalInvocation);
    }
  }
  
  
  void Builtins::Generate_OnStackReplacement(MacroAssembler* masm) {
    // Lookup the function in the JavaScript frame.
    __ mov(eax, Operand(ebp, JavaScriptFrameConstants::kFunctionOffset));
    {
      FrameScope scope(masm, StackFrame::INTERNAL);
      // Pass function as argument.
      __ push(eax);
      __ CallRuntime(Runtime::kCompileForOnStackReplacement);
    }
  
    Label skip;
    // If the code object is null, just return to the unoptimized code.
    __ cmp(eax, Immediate(0));
    __ j(not_equal, &skip, Label::kNear);
    __ ret(0);
  
    __ bind(&skip);
  
    // Load deoptimization data from the code object.
    __ mov(ebx, Operand(eax, Code::kDeoptimizationDataOffset - kHeapObjectTag));
  
    // Load the OSR entrypoint offset from the deoptimization data.
    __ mov(ebx, Operand(ebx, FixedArray::OffsetOfElementAt(
        DeoptimizationInputData::kOsrPcOffsetIndex) - kHeapObjectTag));
    __ SmiUntag(ebx);
  
    // Compute the target address = code_obj + header_size + osr_offset
    __ lea(eax, Operand(eax, ebx, times_1, Code::kHeaderSize - kHeapObjectTag));
  
    // Overwrite the return address on the stack.
    __ mov(Operand(esp, 0), eax);
  
    // And "return" to the OSR entry point of the function.
    __ ret(0);
  }
  
  
  #undef __
  }  // namespace internal
  }  // namespace v8
  
  #endif  // V8_TARGET_ARCH_X87
  