CSE2410 Fall 2014 Bounce

// Copyright 2012 the V8 project authors. All rights reserved.

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

//

//     * Redistributions of source code must retain the above copyright

//       notice, this list of conditions and the following disclaimer.

//     * Redistributions in binary form must reproduce the above

//       copyright notice, this list of conditions and the following

//       disclaimer in the documentation and/or other materials provided

//       with the distribution.

//     * Neither the name of Google Inc. nor the names of its

//       contributors may be used to endorse or promote products derived

//       from this software without specific prior written permission.

//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include "v8.h"

#if V8_TARGET_ARCH_IA32

#include "codegen.h"

#include "deoptimizer.h"

#include "full-codegen.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                : called function (only guaranteed when

  //                          extra_args requires it)

  //  -- esi                : context

  //  -- esp[0]             : return address

  //  -- esp[4]             : last argument

  //  -- ...

  //  -- esp[4 * argc]      : first argument (argc == eax)

  //  -- esp[4 * (argc +1)] : receiver

  // -----------------------------------

  // Insert extra arguments.

  int num_extra_args = 0;

  if (extra_args == NEEDS_CALLED_FUNCTION) {

    num_extra_args = 1;

    Register scratch = ebx;

    __ pop(scratch);  // Save return address.

    __ push(edi);

    __ push(scratch);  // Restore return address.

  } else {

    ASSERT(extra_args == NO_EXTRA_ARGUMENTS);

  }

  // 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 CallRuntimePassFunction(MacroAssembler* masm,

                                    Runtime::FunctionId function_id) {

  FrameScope scope(masm, StackFrame::INTERNAL);

  // Push a copy of the function.

  __ push(edi);

  // Push call kind information.

  __ push(ecx);

  // Function is also the parameter to the runtime call.

  __ push(edi);

  __ CallRuntime(function_id, 1);

  // Restore call kind information.

  __ pop(ecx);

  // Restore receiver.

  __ pop(edi);

}

static void GenerateTailCallToSharedCode(MacroAssembler* masm) {

  __ mov(eax, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));

  __ mov(eax, FieldOperand(eax, SharedFunctionInfo::kCodeOffset));

  __ lea(eax, FieldOperand(eax, Code::kHeaderSize));

  __ jmp(eax);

}

void Builtins::Generate_InRecompileQueue(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);

  CallRuntimePassFunction(masm, Runtime::kTryInstallRecompiledCode);

  // Tail call to returned code.

  __ lea(eax, FieldOperand(eax, Code::kHeaderSize));

  __ jmp(eax);

  __ bind(&ok);

  GenerateTailCallToSharedCode(masm);

}

void Builtins::Generate_ConcurrentRecompile(MacroAssembler* masm) {

  CallRuntimePassFunction(masm, Runtime::kConcurrentRecompile);

  GenerateTailCallToSharedCode(masm);

}

static void Generate_JSConstructStubHelper(MacroAssembler* masm,

                                           bool is_api_function,

                                           bool count_constructions) {

  // ----------- S t a t e -------------

  //  -- eax: number of arguments

  //  -- edi: constructor function

  // -----------------------------------

  // Should never count constructions for api objects.

  ASSERT(!is_api_function || !count_constructions);

  // Enter a construct frame.

  {

    FrameScope scope(masm, StackFrame::CONSTRUCT);

    // Store a smi-tagged arguments count on the stack.

    __ SmiTag(eax);

    __ push(eax);

    // Push the function to invoke on the stack.

    __ push(edi);

    // Try to allocate the object without transitioning into C code. If any of

    // the preconditions is not met, the code bails out to the runtime call.

    Label rt_call, allocated;

    if (FLAG_inline_new) {

      Label undo_allocation;

#ifdef ENABLE_DEBUGGER_SUPPORT

      ExternalReference debug_step_in_fp =

          ExternalReference::debug_step_in_fp_address(masm->isolate());

      __ cmp(Operand::StaticVariable(debug_step_in_fp), Immediate(0));

      __ j(not_equal, &rt_call);

#endif

      // Verified that the constructor is a JSFunction.

      // Load the initial map and verify that it is in fact a map.

      // edi: constructor

      __ mov(eax, FieldOperand(edi, JSFunction::kPrototypeOrInitialMapOffset));

      // Will both indicate a NULL and a Smi

      __ JumpIfSmi(eax, &rt_call);

      // edi: constructor

      // eax: initial map (if proven valid below)

      __ CmpObjectType(eax, MAP_TYPE, ebx);

      __ j(not_equal, &rt_call);

      // Check that the constructor is not constructing a JSFunction (see

      // comments in Runtime_NewObject in runtime.cc). In which case the

      // initial map's instance type would be JS_FUNCTION_TYPE.

      // edi: constructor

      // eax: initial map

      __ CmpInstanceType(eax, JS_FUNCTION_TYPE);

      __ j(equal, &rt_call);

      if (count_constructions) {

        Label allocate;

        // Decrease generous allocation count.

        __ mov(ecx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));

        __ dec_b(FieldOperand(ecx,

                              SharedFunctionInfo::kConstructionCountOffset));

        __ j(not_zero, &allocate);

        __ push(eax);

        __ push(edi);

        __ push(edi);  // constructor

        // The call will replace the stub, so the countdown is only done once.

        __ CallRuntime(Runtime::kFinalizeInstanceSize, 1);

        __ pop(edi);

        __ pop(eax);

        __ bind(&allocate);

      }

      // Now allocate the JSObject on the heap.

      // edi: constructor

      // eax: initial map

      __ movzx_b(edi, FieldOperand(eax, Map::kInstanceSizeOffset));

      __ shl(edi, kPointerSizeLog2);

      __ Allocate(edi, ebx, edi, no_reg, &rt_call, NO_ALLOCATION_FLAGS);

      // Allocated the JSObject, now initialize the fields.

      // eax: initial map

      // ebx: JSObject

      // edi: start of next object

      __ mov(Operand(ebx, JSObject::kMapOffset), eax);

      Factory* factory = masm->isolate()->factory();

      __ mov(ecx, factory->empty_fixed_array());

      __ mov(Operand(ebx, JSObject::kPropertiesOffset), ecx);

      __ mov(Operand(ebx, JSObject::kElementsOffset), ecx);

      // Set extra fields in the newly allocated object.

      // eax: initial map

      // ebx: JSObject

      // edi: start of next object

      __ lea(ecx, Operand(ebx, JSObject::kHeaderSize));

      __ mov(edx, factory->undefined_value());

      if (count_constructions) {

        __ movzx_b(esi,

                   FieldOperand(eax, Map::kPreAllocatedPropertyFieldsOffset));

        __ lea(esi,

               Operand(ebx, esi, times_pointer_size, JSObject::kHeaderSize));

        // esi: offset of first field after pre-allocated fields

        if (FLAG_debug_code) {

          __ cmp(esi, edi);

          __ Assert(less_equal,

                    kUnexpectedNumberOfPreAllocatedPropertyFields);

        }

        __ InitializeFieldsWithFiller(ecx, esi, edx);

        __ mov(edx, factory->one_pointer_filler_map());

      }

      __ InitializeFieldsWithFiller(ecx, edi, edx);

      // Add the object tag to make the JSObject real, so that we can continue

      // and jump into the continuation code at any time from now on. Any

      // failures need to undo the allocation, so that the heap is in a

      // consistent state and verifiable.

      // eax: initial map

      // ebx: JSObject

      // edi: start of next object

      __ or_(ebx, Immediate(kHeapObjectTag));

      // Check if a non-empty properties array is needed.

      // Allocate and initialize a FixedArray if it is.

      // eax: initial map

      // ebx: JSObject

      // edi: start of next object

      // Calculate the total number of properties described by the map.

      __ movzx_b(edx, FieldOperand(eax, Map::kUnusedPropertyFieldsOffset));

      __ movzx_b(ecx,

                 FieldOperand(eax, Map::kPreAllocatedPropertyFieldsOffset));

      __ add(edx, ecx);

      // Calculate unused properties past the end of the in-object properties.

      __ movzx_b(ecx, FieldOperand(eax, Map::kInObjectPropertiesOffset));

      __ sub(edx, ecx);

      // Done if no extra properties are to be allocated.

      __ j(zero, &allocated);

      __ Assert(positive, kPropertyAllocationCountFailed);

      // Scale the number of elements by pointer size and add the header for

      // FixedArrays to the start of the next object calculation from above.

      // ebx: JSObject

      // edi: start of next object (will be start of FixedArray)

      // edx: number of elements in properties array

      __ Allocate(FixedArray::kHeaderSize,

                  times_pointer_size,

                  edx,

                  REGISTER_VALUE_IS_INT32,

                  edi,

                  ecx,

                  no_reg,

                  &undo_allocation,

                  RESULT_CONTAINS_TOP);

      // Initialize the FixedArray.

      // ebx: JSObject

      // edi: FixedArray

      // edx: number of elements

      // ecx: start of next object

      __ mov(eax, factory->fixed_array_map());

      __ mov(Operand(edi, FixedArray::kMapOffset), eax);  // setup the map

      __ SmiTag(edx);

      __ mov(Operand(edi, FixedArray::kLengthOffset), edx);  // and length

      // Initialize the fields to undefined.

      // ebx: JSObject

      // edi: FixedArray

      // ecx: start of next object

      { Label loop, entry;

        __ mov(edx, factory->undefined_value());

        __ lea(eax, Operand(edi, FixedArray::kHeaderSize));

        __ jmp(&entry);

        __ bind(&loop);

        __ mov(Operand(eax, 0), edx);

        __ add(eax, Immediate(kPointerSize));

        __ bind(&entry);

        __ cmp(eax, ecx);

        __ j(below, &loop);

      }

      // Store the initialized FixedArray into the properties field of

      // the JSObject

      // ebx: JSObject

      // edi: FixedArray

      __ or_(edi, Immediate(kHeapObjectTag));  // add the heap tag

      __ mov(FieldOperand(ebx, JSObject::kPropertiesOffset), edi);

      // Continue with JSObject being successfully allocated

      // ebx: JSObject

      __ jmp(&allocated);

      // Undo the setting of the new top so that the heap is verifiable. For

      // example, the map's unused properties potentially do not match the

      // allocated objects unused properties.

      // ebx: JSObject (previous new top)

      __ bind(&undo_allocation);

      __ UndoAllocationInNewSpace(ebx);

    }

    // Allocate the new receiver object using the runtime call.

    __ bind(&rt_call);

    // Must restore edi (constructor) before calling runtime.

    __ mov(edi, Operand(esp, 0));

    // edi: function (constructor)

    __ push(edi);

    __ CallRuntime(Runtime::kNewObject, 1);

    __ mov(ebx, eax);  // store result in ebx

    // New object allocated.

    // ebx: newly allocated object

    __ bind(&allocated);

    // Retrieve the function from the stack.

    __ pop(edi);

    // Retrieve smi-tagged arguments count from the stack.

    __ mov(eax, Operand(esp, 0));

    __ SmiUntag(eax);

    // 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);

    // 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();

      ParameterCount expected(0);

      __ InvokeCode(code, expected, expected, RelocInfo::CODE_TARGET,

                    CALL_FUNCTION, NullCallWrapper(), CALL_AS_METHOD);

    } else {

      ParameterCount actual(eax);

      __ InvokeFunction(edi, actual, CALL_FUNCTION,

                        NullCallWrapper(), CALL_AS_METHOD);

    }

    // Store offset of return address for deoptimizer.

    if (!is_api_function && !count_constructions) {

      masm->isolate()->heap()->SetConstructStubDeoptPCOffset(masm->pc_offset());

    }

    // Restore context from the frame.

    __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset));

    // 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_SPEC_OBJECT_TYPE, it is not an object in the ECMA sense.

    __ CmpObjectType(eax, FIRST_SPEC_OBJECT_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.

    __ bind(&exit);

    __ mov(ebx, Operand(esp, kPointerSize));  // Get arguments count.

    // Leave construct frame.

  }

  // 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);

  __ IncrementCounter(masm->isolate()->counters()->constructed_objects(), 1);

  __ ret(0);

}

void Builtins::Generate_JSConstructStubCountdown(MacroAssembler* masm) {

  Generate_JSConstructStubHelper(masm, false, true);

}

void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) {

  Generate_JSConstructStubHelper(masm, false, false);

}

void Builtins::Generate_JSConstructStubApi(MacroAssembler* masm) {

  Generate_JSConstructStubHelper(masm, true, false);

}

static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,

                                             bool is_construct) {

  ProfileEntryHookStub::MaybeCallEntryHook(masm);

  // Clear the context before we push it when entering the internal frame.

  __ Set(esi, Immediate(0));

  {

    FrameScope scope(masm, StackFrame::INTERNAL);

    // Load the previous frame pointer (ebx) to access C arguments

    __ mov(ebx, Operand(ebp, 0));

    // Get the function from the frame and setup the context.

    __ mov(ecx, Operand(ebx, EntryFrameConstants::kFunctionArgOffset));

    __ mov(esi, FieldOperand(ecx, JSFunction::kContextOffset));

    // Push the function and the receiver onto the stack.

    __ push(ecx);

    __ 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));

    // Copy arguments to the stack in a loop.

    Label loop, entry;

    __ Set(ecx, Immediate(0));

    __ jmp(&entry);

    __ 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);

    // Get the function from the stack and call it.

    // kPointerSize for the receiver.

    __ mov(edi, Operand(esp, eax, times_4, kPointerSize));

    // Invoke the code.

    if (is_construct) {

      // No type feedback cell is available

      Handle<Object> undefined_sentinel(

          masm->isolate()->heap()->undefined_value(), masm->isolate());

      __ mov(ebx, Immediate(undefined_sentinel));

      CallConstructStub stub(NO_CALL_FUNCTION_FLAGS);

      __ CallStub(&stub);

    } else {

      ParameterCount actual(eax);

      __ InvokeFunction(edi, actual, CALL_FUNCTION,

                        NullCallWrapper(), CALL_AS_METHOD);

    }

    // 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);

}

void Builtins::Generate_LazyCompile(MacroAssembler* masm) {

  CallRuntimePassFunction(masm, Runtime::kLazyCompile);

  // Do a tail-call of the compiled function.

  __ lea(eax, FieldOperand(eax, Code::kHeaderSize));

  __ jmp(eax);

}

void Builtins::Generate_LazyRecompile(MacroAssembler* masm) {

  CallRuntimePassFunction(masm, Runtime::kLazyRecompile);

  // Do a tail-call of the compiled function.

  __ lea(eax, FieldOperand(eax, Code::kHeaderSize));

  __ jmp(eax);

}

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_NotifyStubFailure(MacroAssembler* masm) {

  // 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, 0);

    __ popad();

    // Tear down internal frame.

  }

  __ pop(MemOperand(esp, 0));  // Ignore state offset

  __ ret(0);  // Return to IC Miss stub, continuation still on stack.

}

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, 1);

    // 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);

}

void Builtins::Generate_FunctionCall(MacroAssembler* masm) {

  Factory* factory = masm->isolate()->factory();

  // 1. Make sure we have at least one argument.

  { Label done;

    __ test(eax, eax);

    __ j(not_zero, &done);

    __ pop(ebx);

    __ push(Immediate(factory->undefined_value()));

    __ push(ebx);

    __ inc(eax);

    __ bind(&done);

  }

  // 2. Get the function to call (passed as receiver) from the stack, check

  //    if it is a function.

  Label slow, non_function;

  // 1 ~ return address.

  __ mov(edi, Operand(esp, eax, times_4, 1 * kPointerSize));

  __ JumpIfSmi(edi, &non_function);

  __ CmpObjectType(edi, JS_FUNCTION_TYPE, ecx);

  __ j(not_equal, &slow);

  // 3a. Patch the first argument if necessary when calling a function.

  Label shift_arguments;

  __ Set(edx, Immediate(0));  // indicate regular JS_FUNCTION

  { Label convert_to_object, use_global_receiver, patch_receiver;

    // Change context eagerly in case we need the global receiver.

    __ mov(esi, FieldOperand(edi, JSFunction::kContextOffset));

    // Do not transform the receiver for strict mode functions.

    __ mov(ebx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));

    __ test_b(FieldOperand(ebx, SharedFunctionInfo::kStrictModeByteOffset),

              1 << SharedFunctionInfo::kStrictModeBitWithinByte);

    __ j(not_equal, &shift_arguments);

    // Do not transform the receiver for natives (shared already in ebx).

    __ test_b(FieldOperand(ebx, SharedFunctionInfo::kNativeByteOffset),

              1 << SharedFunctionInfo::kNativeBitWithinByte);

    __ j(not_equal, &shift_arguments);

    // Compute the receiver in non-strict mode.

    __ mov(ebx, Operand(esp, eax, times_4, 0));  // First argument.

    // Call ToObject on the receiver if it is not an object, or use the

    // global object if it is null or undefined.

    __ JumpIfSmi(ebx, &convert_to_object);

    __ cmp(ebx, factory->null_value());

    __ j(equal, &use_global_receiver);

    __ cmp(ebx, factory->undefined_value());

    __ j(equal, &use_global_receiver);

    STATIC_ASSERT(LAST_SPEC_OBJECT_TYPE == LAST_TYPE);

    __ CmpObjectType(ebx, FIRST_SPEC_OBJECT_TYPE, ecx);

    __ j(above_equal, &shift_arguments);

    __ bind(&convert_to_object);

    { // In order to preserve argument count.

      FrameScope scope(masm, StackFrame::INTERNAL);

      __ SmiTag(eax);

      __ push(eax);

      __ push(ebx);

      __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);

      __ mov(ebx, eax);

      __ Set(edx, Immediate(0));  // restore

      __ pop(eax);

      __ SmiUntag(eax);

    }

    // Restore the function to edi.

    __ mov(edi, Operand(esp, eax, times_4, 1 * kPointerSize));

    __ jmp(&patch_receiver);

    // Use the global receiver object from the called function as the

    // receiver.

    __ bind(&use_global_receiver);

    const int kGlobalIndex =

        Context::kHeaderSize + Context::GLOBAL_OBJECT_INDEX * kPointerSize;

    __ mov(ebx, FieldOperand(esi, kGlobalIndex));

    __ mov(ebx, FieldOperand(ebx, GlobalObject::kNativeContextOffset));

    __ mov(ebx, FieldOperand(ebx, kGlobalIndex));

    __ mov(ebx, FieldOperand(ebx, GlobalObject::kGlobalReceiverOffset));

    __ bind(&patch_receiver);

    __ mov(Operand(esp, eax, times_4, 0), ebx);

    __ jmp(&shift_arguments);

  }

  // 3b. Check for function proxy.

  __ bind(&slow);

  __ Set(edx, Immediate(1));  // indicate function proxy

  __ CmpInstanceType(ecx, JS_FUNCTION_PROXY_TYPE);

  __ j(equal, &shift_arguments);

  __ bind(&non_function);

  __ Set(edx, Immediate(2));  // indicate non-function

  // 3c. Patch the first argument when calling a non-function.  The

  //     CALL_NON_FUNCTION builtin expects the non-function callee as

  //     receiver, so overwrite the first argument which will ultimately

  //     become the receiver.

  __ mov(Operand(esp, eax, times_4, 0), edi);

  // 4. 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.

  __ bind(&shift_arguments);

  { Label loop;

    __ mov(ecx, eax);

    __ bind(&loop);

    __ mov(ebx, Operand(esp, ecx, times_4, 0));

    __ mov(Operand(esp, ecx, times_4, 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).

  }

  // 5a. Call non-function via tail call to CALL_NON_FUNCTION builtin,

  //     or a function proxy via CALL_FUNCTION_PROXY.

  { Label function, non_proxy;

    __ test(edx, edx);

    __ j(zero, &function);

    __ Set(ebx, Immediate(0));

    __ cmp(edx, Immediate(1));

    __ j(not_equal, &non_proxy);

    __ pop(edx);   // return address

    __ push(edi);  // re-add proxy object as additional argument

    __ push(edx);

    __ inc(eax);

    __ SetCallKind(ecx, CALL_AS_FUNCTION);

    __ GetBuiltinEntry(edx, Builtins::CALL_FUNCTION_PROXY);

    __ jmp(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),

           RelocInfo::CODE_TARGET);

    __ bind(&non_proxy);

    __ SetCallKind(ecx, CALL_AS_METHOD);

    __ GetBuiltinEntry(edx, Builtins::CALL_NON_FUNCTION);

    __ jmp(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),

           RelocInfo::CODE_TARGET);

    __ bind(&function);

  }

  // 5b. Get the code to call from the function and check that the number of

  //     expected arguments matches what we're providing.  If so, jump

  //     (tail-call) to the code in register edx without checking arguments.

  __ mov(edx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));

  __ mov(ebx,

         FieldOperand(edx, SharedFunctionInfo::kFormalParameterCountOffset));

  __ mov(edx, FieldOperand(edi, JSFunction::kCodeEntryOffset));

  __ SmiUntag(ebx);

  __ SetCallKind(ecx, CALL_AS_METHOD);

  __ cmp(eax, ebx);

  __ j(not_equal,

       masm->isolate()->builtins()->ArgumentsAdaptorTrampoline());

  ParameterCount expected(0);

  __ InvokeCode(edx, expected, expected, JUMP_FUNCTION, NullCallWrapper(),

                CALL_AS_METHOD);

}

void Builtins::Generate_FunctionApply(MacroAssembler* masm) {

  static const int kArgumentsOffset = 2 * kPointerSize;

  static const int kReceiverOffset = 3 * kPointerSize;

  static const int kFunctionOffset = 4 * kPointerSize;

  {

    FrameScope frame_scope(masm, StackFrame::INTERNAL);

    __ push(Operand(ebp, kFunctionOffset));  // push this

    __ push(Operand(ebp, kArgumentsOffset));  // push arguments

    __ InvokeBuiltin(Builtins::APPLY_PREPARE, CALL_FUNCTION);

    // 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);

    __ shl(edx, kPointerSizeLog2 - kSmiTagSize);

    // Check if the arguments will overflow the stack.

    __ cmp(ecx, edx);

    __ j(greater, &okay);  // Signed comparison.

    // Out of stack space.

    __ push(Operand(ebp, 4 * kPointerSize));  // push this

    __ push(eax);

    __ InvokeBuiltin(Builtins::APPLY_OVERFLOW, CALL_FUNCTION);

    __ bind(&okay);

    // End of stack check.

    // Push current index and limit.

    const int kLimitOffset =

        StandardFrameConstants::kExpressionsOffset - 1 * kPointerSize;

    const int kIndexOffset = kLimitOffset - 1 * kPointerSize;

    __ push(eax);  // limit

    __ push(Immediate(0));  // index

    // Get the receiver.

    __ mov(ebx, Operand(ebp, kReceiverOffset));

    // Check that the function is a JS function (otherwise it must be a proxy).

    Label push_receiver;

    __ mov(edi, Operand(ebp, kFunctionOffset));

    __ CmpObjectType(edi, JS_FUNCTION_TYPE, ecx);

    __ j(not_equal, &push_receiver);

    // Change context eagerly to get the right global object if necessary.

    __ mov(esi, FieldOperand(edi, JSFunction::kContextOffset));

    // Compute the receiver.

    // Do not transform the receiver for strict mode functions.

    Label call_to_object, use_global_receiver;

    __ mov(ecx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));

    __ test_b(FieldOperand(ecx, SharedFunctionInfo::kStrictModeByteOffset),

              1 << SharedFunctionInfo::kStrictModeBitWithinByte);

    __ j(not_equal, &push_receiver);

    Factory* factory = masm->isolate()->factory();

    // Do not transform the receiver for natives (shared already in ecx).

    __ test_b(FieldOperand(ecx, SharedFunctionInfo::kNativeByteOffset),

              1 << SharedFunctionInfo::kNativeBitWithinByte);

    __ j(not_equal, &push_receiver);

    // Compute the receiver in non-strict mode.

    // Call ToObject on the receiver if it is not an object, or use the

    // global object if it is null or undefined.

    __ JumpIfSmi(ebx, &call_to_object);

    __ cmp(ebx, factory->null_value());

    __ j(equal, &use_global_receiver);

    __ cmp(ebx, factory->undefined_value());

    __ j(equal, &use_global_receiver);

    STATIC_ASSERT(LAST_SPEC_OBJECT_TYPE == LAST_TYPE);

    __ CmpObjectType(ebx, FIRST_SPEC_OBJECT_TYPE, ecx);

    __ j(above_equal, &push_receiver);

    __ bind(&call_to_object);

    __ push(ebx);

    __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);

    __ mov(ebx, eax);

    __ jmp(&push_receiver);

    // Use the current global receiver object as the receiver.

    __ bind(&use_global_receiver);

    const int kGlobalOffset =

        Context::kHeaderSize + Context::GLOBAL_OBJECT_INDEX * kPointerSize;

    __ mov(ebx, FieldOperand(esi, kGlobalOffset));

    __ mov(ebx, FieldOperand(ebx, GlobalObject::kNativeContextOffset));

    __ mov(ebx, FieldOperand(ebx, kGlobalOffset));

    __ mov(ebx, FieldOperand(ebx, GlobalObject::kGlobalReceiverOffset));

    // Push the receiver.

    __ bind(&push_receiver);

    __ push(ebx);

    // Copy all arguments from the array to the stack.

    Label entry, loop;

    __ mov(ecx, Operand(ebp, kIndexOffset));

    __ jmp(&entry);

    __ bind(&loop);

    __ mov(edx, Operand(ebp, kArgumentsOffset));  // load arguments

    // Use inline caching to speed up access to arguments.

    Handle<Code> ic = masm->isolate()->builtins()->KeyedLoadIC_Initialize();

    __ call(ic, RelocInfo::CODE_TARGET);

    // It is important that we do not have a test instruction after the

    // call.  A test instruction after the call is used to indicate that

    // we have generated an inline version of the keyed load.  In this

    // case, we know that we are not generating a test instruction next.

    // Push the nth argument.

    __ push(eax);

    // Update the index on the stack and in register eax.

    __ mov(ecx, Operand(ebp, kIndexOffset));

    __ add(ecx, Immediate(1 << kSmiTagSize));

    __ mov(Operand(ebp, kIndexOffset), ecx);

    __ bind(&entry);

    __ cmp(ecx, Operand(ebp, kLimitOffset));

    __ j(not_equal, &loop);

    // Invoke the function.

    Label call_proxy;

    __ mov(eax, ecx);

    ParameterCount actual(eax);

    __ SmiUntag(eax);

    __ mov(edi, Operand(ebp, kFunctionOffset));

    __ CmpObjectType(edi, JS_FUNCTION_TYPE, ecx);

    __ j(not_equal, &call_proxy);

    __ InvokeFunction(edi, actual, CALL_FUNCTION,

                      NullCallWrapper(), CALL_AS_METHOD);

    frame_scope.GenerateLeaveFrame();

    __ ret(3 * kPointerSize);  // remove this, receiver, and arguments

    // Invoke the function proxy.

    __ bind(&call_proxy);

    __ push(edi);  // add function proxy as last argument

    __ inc(eax);

    __ Set(ebx, Immediate(0));

    __ SetCallKind(ecx, CALL_AS_METHOD);

    __ GetBuiltinEntry(edx, Builtins::CALL_FUNCTION_PROXY);

    __ call(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),

            RelocInfo::CODE_TARGET);

    // Leave internal frame.

  }

  __ ret(3 * kPointerSize);  // remove this, receiver, and arguments

}

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);

  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

  Handle<Object> undefined_sentinel(

      masm->isolate()->heap()->undefined_value(),

      masm->isolate());

  __ mov(ebx, Immediate(undefined_sentinel));

  ArrayConstructorStub stub(masm->isolate());

  __ TailCallStub(&stub);

}

void Builtins::Generate_StringConstructCode(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

  // -----------------------------------

  Counters* counters = masm->isolate()->counters();

  __ IncrementCounter(counters->string_ctor_calls(), 1);

  if (FLAG_debug_code) {

    __ LoadGlobalFunction(Context::STRING_FUNCTION_INDEX, ecx);

    __ cmp(edi, ecx);

    __ Assert(equal, kUnexpectedStringFunction);

  }

  // 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);

  __ mov(ebx, Operand(esp, eax, times_pointer_size, 0));

  __ pop(ecx);

  __ lea(esp, Operand(esp, eax, times_pointer_size, kPointerSize));

  __ push(ecx);

  __ mov(eax, ebx);

  // Lookup the argument in the number to string cache.

  Label not_cached, argument_is_string;

  __ LookupNumberStringCache(eax,  // Input.

                             ebx,  // Result.

                             ecx,  // Scratch 1.

                             edx,  // Scratch 2.

                             &not_cached);

  __ IncrementCounter(counters->string_ctor_cached_number(), 1);

  __ bind(&argument_is_string);

  // ----------- S t a t e -------------

  //  -- ebx    : argument converted to string

  //  -- edi    : constructor function

  //  -- esp[0] : return address

  // -----------------------------------

  // Allocate a JSValue and put the tagged pointer into eax.

  Label gc_required;

  __ Allocate(JSValue::kSize,

              eax,  // Result.

              ecx,  // New allocation top (we ignore it).

              no_reg,

              &gc_required,

              TAG_OBJECT);

  // Set the map.

  __ LoadGlobalFunctionInitialMap(edi, ecx);

  if (FLAG_debug_code) {

    __ cmpb(FieldOperand(ecx, Map::kInstanceSizeOffset),

            JSValue::kSize >> kPointerSizeLog2);

    __ Assert(equal, kUnexpectedStringWrapperInstanceSize);

    __ cmpb(FieldOperand(ecx, Map::kUnusedPropertyFieldsOffset), 0);

    __ Assert(equal, kUnexpectedUnusedPropertiesOfStringWrapper);

  }

  __ mov(FieldOperand(eax, HeapObject::kMapOffset), ecx);

  // Set properties and elements.

  Factory* factory = masm->isolate()->factory();

  __ Set(ecx, Immediate(factory->empty_fixed_array()));

  __ mov(FieldOperand(eax, JSObject::kPropertiesOffset), ecx);

  __ mov(FieldOperand(eax, JSObject::kElementsOffset), ecx);

  // Set the value.

  __ mov(FieldOperand(eax, JSValue::kValueOffset), ebx);

  // Ensure the object is fully initialized.

  STATIC_ASSERT(JSValue::kSize == 4 * kPointerSize);

  // We're done. Return.

  __ ret(0);

  // The argument was not found in the number to string cache. Check

  // if it's a string already before calling the conversion builtin.

  Label convert_argument;

  __ bind(&not_cached);

  STATIC_ASSERT(kSmiTag == 0);

  __ JumpIfSmi(eax, &convert_argument);

  Condition is_string = masm->IsObjectStringType(eax, ebx, ecx);

  __ j(NegateCondition(is_string), &convert_argument);

  __ mov(ebx, eax);

  __ IncrementCounter(counters->string_ctor_string_value(), 1);

  __ jmp(&argument_is_string);

  // Invoke the conversion builtin and put the result into ebx.

  __ bind(&convert_argument);

  __ IncrementCounter(counters->string_ctor_conversions(), 1);

  {

    FrameScope scope(masm, StackFrame::INTERNAL);

    __ push(edi);  // Preserve the function.

    __ push(eax);

    __ InvokeBuiltin(Builtins::TO_STRING, CALL_FUNCTION);

    __ pop(edi);

  }

  __ mov(ebx, eax);

  __ jmp(&argument_is_string);

  // Load the empty string into ebx, remove the receiver from the

  // stack, and jump back to the case where the argument is a string.

  __ bind(&no_arguments);

  __ Set(ebx, Immediate(factory->empty_string()));

  __ pop(ecx);

  __ lea(esp, Operand(esp, kPointerSize));

  __ push(ecx);

  __ jmp(&argument_is_string);

  // At this point the argument is already a string. Call runtime to

  // create a string wrapper.

  __ bind(&gc_required);

  __ IncrementCounter(counters->string_ctor_gc_required(), 1);

  {

    FrameScope scope(masm, StackFrame::INTERNAL);

    __ push(ebx);

    __ CallRuntime(Runtime::kNewStringWrapper, 1);

  }

  __ ret(0);

}

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);

}

void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) {

  // ----------- S t a t e -------------

  //  -- eax : actual number of arguments

  //  -- ebx : expected number of arguments

  //  -- ecx : call kind information

  //  -- edx : code entry to call

  // -----------------------------------

  Label invoke, dont_adapt_arguments;

  __ 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);

    // Copy receiver and all expected arguments.

    const int offset = StandardFrameConstants::kCallerSPOffset;

    __ lea(eax, Operand(ebp, eax, times_4, offset));

    __ mov(edi, -1);  // account for receiver

    Label copy;

    __ bind(&copy);

    __ inc(edi);

    __ push(Operand(eax, 0));

    __ sub(eax, Immediate(kPointerSize));

    __ cmp(edi, ebx);

    __ j(less, &copy);

    __ jmp(&invoke);

  }

  {  // Too few parameters: Actual < expected.

    __ bind(&too_few);

    EnterArgumentsAdaptorFrame(masm);

    // 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);

  }

  // Call the entry point.

  __ bind(&invoke);

  // Restore function pointer.

  __ mov(edi, Operand(ebp, JavaScriptFrameConstants::kFunctionOffset));

  __ call(edx);

  // 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);

  __ jmp(edx);

}

void Builtins::Generate_OnStackReplacement(MacroAssembler* masm) {

  // Lookup the function in the JavaScript frame.

  __ mov(eax, Operand(ebp, JavaScriptFrameConstants::kFunctionOffset));

  {

    FrameScope scope(masm, StackFrame::INTERNAL);

    // Lookup and calculate pc offset.

    __ mov(edx, Operand(ebp, StandardFrameConstants::kCallerPCOffset));

    __ mov(ebx, FieldOperand(eax, JSFunction::kSharedFunctionInfoOffset));

    __ sub(edx, Immediate(Code::kHeaderSize - kHeapObjectTag));

    __ sub(edx, FieldOperand(ebx, SharedFunctionInfo::kCodeOffset));

    __ SmiTag(edx);

    // Pass both function and pc offset as arguments.

    __ push(eax);

    __ push(edx);

    __ CallRuntime(Runtime::kCompileForOnStackReplacement, 2);

  }

  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);

}

void Builtins::Generate_OsrAfterStackCheck(MacroAssembler* masm) {

  // We check the stack limit as indicator that recompilation might be done.

  Label ok;

  ExternalReference stack_limit =

      ExternalReference::address_of_stack_limit(masm->isolate());

  __ cmp(esp, Operand::StaticVariable(stack_limit));

  __ j(above_equal, &ok, Label::kNear);

  {

    FrameScope scope(masm, StackFrame::INTERNAL);

    __ CallRuntime(Runtime::kStackGuard, 0);

  }

  __ jmp(masm->isolate()->builtins()->OnStackReplacement(),

         RelocInfo::CODE_TARGET);

  __ bind(&ok);

  __ ret(0);

}

#undef __

}

}  // namespace v8::internal

#endif  // V8_TARGET_ARCH_IA32