macro-assembler-ia32.h

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// 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.
 
#ifndef V8_CODEGEN_IA32_MACRO_ASSEMBLER_IA32_H_
#define V8_CODEGEN_IA32_MACRO_ASSEMBLER_IA32_H_
 
#ifndef INCLUDED_FROM_MACRO_ASSEMBLER_H
#error This header must be included via macro-assembler.h
#endif
 
#include <stdint.h>
 
#include "include/v8-internal.h"
#include "src/base/logging.h"
#include "src/base/macros.h"
#include "src/builtins/builtins.h"
#include "src/codegen/assembler.h"
#include "src/codegen/bailout-reason.h"
#include "src/codegen/cpu-features.h"
#include "src/codegen/ia32/assembler-ia32.h"
#include "src/codegen/ia32/register-ia32.h"
#include "src/codegen/label.h"
#include "src/codegen/macro-assembler-base.h"
#include "src/codegen/reglist.h"
#include "src/codegen/reloc-info.h"
#include "src/codegen/shared-ia32-x64/macro-assembler-shared-ia32-x64.h"
#include "src/common/globals.h"
#include "src/execution/frame-constants.h"
#include "src/execution/frames.h"
#include "src/handles/handles.h"
#include "src/objects/heap-object.h"
#include "src/objects/smi.h"
#include "src/roots/roots.h"
#include "src/runtime/runtime.h"
 
namespace v8 {
namespace internal {
 
class InstructionStream;
class ExternalReference;
class StatsCounter;
 
// Convenience for platform-independent signatures.  We do not normally
// distinguish memory operands from other operands on ia32.
using MemOperand = Operand;
 
// TODO(victorgomes): Move definition to macro-assembler.h, once all other
// platforms are updated.
enum class StackLimitKind { kInterruptStackLimit, kRealStackLimit };
 
// Convenient class to access arguments below the stack pointer.
class StackArgumentsAccessor {
 public:
  // argc = the number of arguments not including the receiver.
  explicit StackArgumentsAccessor(Register argc) : argc_(argc) {
    DCHECK_NE(argc_, no_reg);
  }
 
  // Argument 0 is the receiver (despite argc not including the receiver).
  Operand operator[](int index) const { return GetArgumentOperand(index); }
 
  Operand GetArgumentOperand(int index) const;
  Operand GetReceiverOperand() const { return GetArgumentOperand(0); }
 
 private:
  const Register argc_;
 
  DISALLOW_IMPLICIT_CONSTRUCTORS(StackArgumentsAccessor);
};
 
class V8_EXPORT_PRIVATE MacroAssembler
    : public SharedMacroAssembler<MacroAssembler> {
 public:
  using SharedMacroAssembler<MacroAssembler>::SharedMacroAssembler;
 
  void MemoryChunkHeaderFromObject(Register object, Register header);
  void CheckPageFlag(Register object, Register scratch, int mask, Condition cc,
                     Label* condition_met,
                     Label::Distance condition_met_distance = Label::kFar);
 
  // Activation support.
  void EnterFrame(StackFrame::Type type);
  void EnterFrame(StackFrame::Type type, bool load_constant_pool_pointer_reg) {
    // Out-of-line constant pool not implemented on ia32.
    UNREACHABLE();
  }
  void LeaveFrame(StackFrame::Type type);
 
// Allocate stack space of given size (i.e. decrement {esp} by the value
// stored in the given register, or by a constant). If you need to perform a
// stack check, do it before calling this function because this function may
// write into the newly allocated space. It may also overwrite the given
// register's value, in the version that takes a register.
#ifdef V8_OS_WIN
  void AllocateStackSpace(Register bytes_scratch);
  void AllocateStackSpace(int bytes);
#else
  void AllocateStackSpace(Register bytes) { sub(esp, bytes); }
  void AllocateStackSpace(int bytes) {
    DCHECK_GE(bytes, 0);
    if (bytes == 0) return;
    sub(esp, Immediate(bytes));
  }
#endif
 
  // Print a message to stdout and abort execution.
  void Abort(AbortReason reason);
 
  // Calls Abort(msg) if the condition cc is not satisfied.
  // Use --debug_code to enable.
  void Assert(Condition cc, AbortReason reason) NOOP_UNLESS_DEBUG_CODE;
 
  // Like Assert(), but without condition.
  // Use --debug_code to enable.
  void AssertUnreachable(AbortReason reason) NOOP_UNLESS_DEBUG_CODE;
 
  // Like Assert(), but always enabled.
  void Check(Condition cc, AbortReason reason);
 
  // Check that the stack is aligned.
  void CheckStackAlignment();
 
  // Align to natural boundary
  void AlignStackPointer();
 
  // Move a constant into a destination using the most efficient encoding.
  void Move(Register dst, int32_t x) {
    if (x == 0) {
      xor_(dst, dst);
    } else {
      mov(dst, Immediate(x));
    }
  }
  void Move(Register dst, const Immediate& src);
  void Move(Register dst, Tagged<Smi> src) { Move(dst, Immediate(src)); }
  void Move(Register dst, Handle<HeapObject> src);
  void Move(Register dst, Register src);
  void Move(Register dst, Operand src);
  void Move(Operand dst, const Immediate& src);
 
  // Move an immediate into an XMM register.
  void Move(XMMRegister dst, uint32_t src);
  void Move(XMMRegister dst, uint64_t src);
  void Move(XMMRegister dst, float src) {
    Move(dst, base::bit_cast<uint32_t>(src));
  }
  void Move(XMMRegister dst, double src) {
    Move(dst, base::bit_cast<uint64_t>(src));
  }
 
  Operand EntryFromBuiltinAsOperand(Builtin builtin);
 
  void Call(Register reg) { call(reg); }
  void Call(Operand op) { call(op); }
  void Call(Label* target) { call(target); }
  void Call(Handle<Code> code_object, RelocInfo::Mode rmode);
 
  // Load the builtin given by the Smi in |builtin_index| into |target|.
  void LoadEntryFromBuiltinIndex(Register builtin_index, Register target);
  void CallBuiltinByIndex(Register builtin_index, Register target);
  void CallBuiltin(Builtin builtin);
  void TailCallBuiltin(Builtin builtin);
 
#ifdef V8_ENABLE_LEAPTIERING
  void LoadEntrypointFromJSDispatchTable(Register destination,
                                         Register dispatch_handle);
#endif  // V8_ENABLE_LEAPTIERING
 
  // Load the code entry point from the Code object.
  void LoadCodeInstructionStart(Register destination, Register code_object,
                                CodeEntrypointTag = kDefaultCodeEntrypointTag);
  void CallCodeObject(Register code_object);
  void JumpCodeObject(Register code_object,
                      JumpMode jump_mode = JumpMode::kJump);
 
  // Convenience functions to call/jmp to the code of a JSFunction object.
  void CallJSFunction(Register function_object, uint16_t argument_count);
  void JumpJSFunction(Register function_object,
                      JumpMode jump_mode = JumpMode::kJump);
#ifdef V8_ENABLE_WEBASSEMBLY
  void ResolveWasmCodePointer(Register target);
  void CallWasmCodePointer(Register target,
                           CallJumpMode call_jump_mode = CallJumpMode::kCall);
#endif
 
  void Jump(const ExternalReference& reference);
  void Jump(Handle<Code> code_object, RelocInfo::Mode rmode);
 
  void LoadLabelAddress(Register dst, Label* lbl);
 
  void LoadMap(Register destination, Register object);
 
  void LoadFeedbackVector(Register dst, Register closure, Register scratch,
                          Label* fbv_undef, Label::Distance distance);
 
  void Trap();
  void DebugBreak();
 
  void CallForDeoptimization(Builtin target, int deopt_id, Label* exit,
                             DeoptimizeKind kind, Label* ret,
                             Label* jump_deoptimization_entry_label);
 
  // Jump the register contains a smi.
  inline void JumpIfSmi(Register value, Label* smi_label,
                        Label::Distance distance = Label::kFar) {
    test(value, Immediate(kSmiTagMask));
    j(zero, smi_label, distance);
  }
  // Jump if the operand is a smi.
  inline void JumpIfSmi(Operand value, Label* smi_label,
                        Label::Distance distance = Label::kFar) {
    test(value, Immediate(kSmiTagMask));
    j(zero, smi_label, distance);
  }
 
  void JumpIfEqual(Register a, int32_t b, Label* dest) {
    cmp(a, Immediate(b));
    j(equal, dest);
  }
 
  void JumpIfLessThan(Register a, int32_t b, Label* dest) {
    cmp(a, Immediate(b));
    j(less, dest);
  }
 
  void SmiUntag(Register reg) { sar(reg, kSmiTagSize); }
  void SmiUntag(Register output, Register value) {
    mov(output, value);
    SmiUntag(output);
  }
 
  void SmiToInt32(Register reg) { SmiUntag(reg); }
 
  // Before calling a C-function from generated code, align arguments on stack.
  // After aligning the frame, arguments must be stored in esp[0], esp[4],
  // etc., not pushed. The argument count assumes all arguments are word sized.
  // Some compilers/platforms require the stack to be aligned when calling
  // C++ code.
  // Needs a scratch register to do some arithmetic. This register will be
  // trashed.
  void PrepareCallCFunction(int num_arguments, Register scratch);
 
  // Calls a C function and cleans up the space for arguments allocated
  // by PrepareCallCFunction. The called function is not allowed to trigger a
  // garbage collection, since that might move the code and invalidate the
  // return address (unless this is somehow accounted for by the called
  // function).
  int CallCFunction(
      ExternalReference function, int num_arguments,
      SetIsolateDataSlots set_isolate_data_slots = SetIsolateDataSlots::kYes,
      Label* return_location = nullptr);
  int CallCFunction(
      Register function, int num_arguments,
      SetIsolateDataSlots set_isolate_data_slots = SetIsolateDataSlots::kYes,
      Label* return_location = nullptr);
 
  void ShlPair(Register high, Register low, uint8_t imm8);
  void ShlPair_cl(Register high, Register low);
  void ShrPair(Register high, Register low, uint8_t imm8);
  void ShrPair_cl(Register high, Register low);
  void SarPair(Register high, Register low, uint8_t imm8);
  void SarPair_cl(Register high, Register low);
 
  // Generates function and stub prologue code.
  void StubPrologue(StackFrame::Type type);
  void Prologue();
 
  // Helpers for argument handling
  void DropArguments(Register count, Register scratch);
  void DropArgumentsAndPushNewReceiver(Register argc, Register receiver,
                                       Register scratch);
  void DropArgumentsAndPushNewReceiver(Register argc, Operand receiver,
                                       Register scratch);
 
  void Lzcnt(Register dst, Register src) { Lzcnt(dst, Operand(src)); }
  void Lzcnt(Register dst, Operand src);
 
  void Tzcnt(Register dst, Register src) { Tzcnt(dst, Operand(src)); }
  void Tzcnt(Register dst, Operand src);
 
  void Popcnt(Register dst, Register src) { Popcnt(dst, Operand(src)); }
  void Popcnt(Register dst, Operand src);
 
  void PushReturnAddressFrom(Register src) { push(src); }
  void PopReturnAddressTo(Register dst) { pop(dst); }
 
  void PushReturnAddressFrom(XMMRegister src, Register scratch) {
    Push(src, scratch);
  }
  void PopReturnAddressTo(XMMRegister dst, Register scratch) {
    Pop(dst, scratch);
  }
 
  void Ret();
 
  // Root register utility functions.
 
  void InitializeRootRegister();
 
  Operand RootAsOperand(RootIndex index);
  void LoadRoot(Register destination, RootIndex index) final;
 
  // Indirect root-relative loads.
  void LoadFromConstantsTable(Register destination, int constant_index) final;
  void LoadRootRegisterOffset(Register destination, intptr_t offset) final;
  void LoadRootRelative(Register destination, int32_t offset) final;
  void StoreRootRelative(int32_t offset, Register value) final;
 
  void PushPC();
 
  enum class PushArrayOrder { kNormal, kReverse };
  // `array` points to the first element (the lowest address).
  // `array` and `size` are not modified.
  void PushArray(Register array, Register size, Register scratch,
                 PushArrayOrder order = PushArrayOrder::kNormal);
 
  // Operand pointing to an external reference.
  // May emit code to set up the scratch register. The operand is
  // only guaranteed to be correct as long as the scratch register
  // isn't changed.
  // If the operand is used more than once, use a scratch register
  // that is guaranteed not to be clobbered.
  Operand ExternalReferenceAsOperand(ExternalReference reference,
                                     Register scratch);
  Operand ExternalReferenceAsOperand(IsolateFieldId id) {
    return ExternalReferenceAsOperand(ExternalReference::Create(id), no_reg);
  }
  Operand ExternalReferenceAddressAsOperand(ExternalReference reference);
  Operand HeapObjectAsOperand(Handle<HeapObject> object);
 
  void LoadAddress(Register destination, ExternalReference source);
 
  void CompareRoot(Register with, RootIndex index);
  void CompareRoot(Register with, Register scratch, RootIndex index);
 
  // Return and drop arguments from stack, where the number of arguments
  // may be bigger than 2^16 - 1.  Requires a scratch register.
  void Ret(int bytes_dropped, Register scratch);
 
  void PextrdPreSse41(Register dst, XMMRegister src, uint8_t imm8);
  void PinsrdPreSse41(XMMRegister dst, Register src, uint8_t imm8,
                      uint32_t* load_pc_offset) {
    PinsrdPreSse41(dst, Operand(src), imm8, load_pc_offset);
  }
  void PinsrdPreSse41(XMMRegister dst, Operand src, uint8_t imm8,
                      uint32_t* load_pc_offset);
 
  // Expression support
  // cvtsi2sd instruction only writes to the low 64-bit of dst register, which
  // hinders register renaming and makes dependence chains longer. So we use
  // xorps to clear the dst register before cvtsi2sd to solve this issue.
  void Cvtsi2ss(XMMRegister dst, Register src) { Cvtsi2ss(dst, Operand(src)); }
  void Cvtsi2ss(XMMRegister dst, Operand src);
  void Cvtsi2sd(XMMRegister dst, Register src) { Cvtsi2sd(dst, Operand(src)); }
  void Cvtsi2sd(XMMRegister dst, Operand src);
 
  void Cvtui2ss(XMMRegister dst, Register src, Register tmp) {
    Cvtui2ss(dst, Operand(src), tmp);
  }
  void Cvtui2ss(XMMRegister dst, Operand src, Register tmp);
  void Cvttss2ui(Register dst, XMMRegister src, XMMRegister tmp) {
    Cvttss2ui(dst, Operand(src), tmp);
  }
  void Cvttss2ui(Register dst, Operand src, XMMRegister tmp);
  void Cvtui2sd(XMMRegister dst, Register src, Register scratch) {
    Cvtui2sd(dst, Operand(src), scratch);
  }
  void Cvtui2sd(XMMRegister dst, Operand src, Register scratch);
  void Cvttsd2ui(Register dst, XMMRegister src, XMMRegister tmp) {
    Cvttsd2ui(dst, Operand(src), tmp);
  }
  void Cvttsd2ui(Register dst, Operand src, XMMRegister tmp);
 
  void Push(Register src) { push(src); }
  void Push(Operand src) { push(src); }
  void Push(Immediate value);
  void Push(Handle<HeapObject> handle) { push(Immediate(handle)); }
  void Push(Tagged<Smi> smi) { Push(Immediate(smi)); }
  void Push(XMMRegister src, Register scratch) {
    movd(scratch, src);
    push(scratch);
  }
 
  void Pop(Register dst) { pop(dst); }
  void Pop(Operand dst) { pop(dst); }
  void Pop(XMMRegister dst, Register scratch) {
    pop(scratch);
    movd(dst, scratch);
  }
 
  void MaybeSaveRegisters(RegList registers);
  void MaybeRestoreRegisters(RegList registers);
 
  void CallEphemeronKeyBarrier(Register object, Register slot_address,
                               SaveFPRegsMode fp_mode);
 
  void CallRecordWriteStubSaveRegisters(
      Register object, Register slot_address, SaveFPRegsMode fp_mode,
      StubCallMode mode = StubCallMode::kCallBuiltinPointer);
  void CallRecordWriteStub(
      Register object, Register slot_address, SaveFPRegsMode fp_mode,
      StubCallMode mode = StubCallMode::kCallBuiltinPointer);
 
  // Calculate how much stack space (in bytes) are required to store caller
  // registers excluding those specified in the arguments.
  int RequiredStackSizeForCallerSaved(SaveFPRegsMode fp_mode,
                                      Register exclusion = no_reg) const;
 
  // PushCallerSaved and PopCallerSaved do not arrange the registers in any
  // particular order so they are not useful for calls that can cause a GC.
  // The caller can exclude a register that does not need to be saved and
  // restored.
 
  // Push caller saved registers on the stack, and return the number of bytes
  // stack pointer is adjusted.
  int PushCallerSaved(SaveFPRegsMode fp_mode, Register exclusion = no_reg);
  // Restore caller saved registers from the stack, and return the number of
  // bytes stack pointer is adjusted.
  int PopCallerSaved(SaveFPRegsMode fp_mode, Register exclusion = no_reg);
 
  // Compute the start of the generated instruction stream from the current PC.
  // This is an alternative to embedding the {CodeObject} handle as a reference.
  void ComputeCodeStartAddress(Register dst);
 
  // Control-flow integrity:
 
  // Define a function entrypoint. This doesn't emit any code for this
  // architecture, as control-flow integrity is not supported for it.
  void CodeEntry() {}
  // Define an exception handler.
  void ExceptionHandler() {}
  // Define an exception handler and bind a label.
  void BindExceptionHandler(Label* label) { bind(label); }
 
  void PushRoot(RootIndex index);
 
  // Compare the object in a register to a value and jump if they are equal.
  void JumpIfRoot(Register with, RootIndex index, Label* if_equal,
                  Label::Distance if_equal_distance = Label::kFar) {
    CompareRoot(with, index);
    j(equal, if_equal, if_equal_distance);
  }
 
  // Compare the object in a register to a value and jump if they are not equal.
  void JumpIfNotRoot(Register with, RootIndex index, Label* if_not_equal,
                     Label::Distance if_not_equal_distance = Label::kFar) {
    CompareRoot(with, index);
    j(not_equal, if_not_equal, if_not_equal_distance);
  }
 
  // Checks if value is in range [lower_limit, higher_limit] using a single
  // comparison. Flags CF=1 or ZF=1 indicate the value is in the range
  // (condition below_equal). It is valid, that |value| == |scratch| as far as
  // this function is concerned.
  void CompareRange(Register value, unsigned lower_limit, unsigned higher_limit,
                    Register scratch);
  void JumpIfIsInRange(Register value, unsigned lower_limit,
                       unsigned higher_limit, Register scratch,
                       Label* on_in_range,
                       Label::Distance near_jump = Label::kFar);
 
  // ---------------------------------------------------------------------------
  // GC Support
  // Notify the garbage collector that we wrote a pointer into an object.
  // |object| is the object being stored into, |value| is the object being
  // stored.  value and scratch registers are clobbered by the operation.
  // The offset is the offset from the start of the object, not the offset from
  // the tagged HeapObject pointer.  For use with FieldOperand(reg, off).
  void RecordWriteField(Register object, int offset, Register value,
                        Register scratch, SaveFPRegsMode save_fp,
                        SmiCheck smi_check = SmiCheck::kInline);
 
  // For page containing |object| mark region covering |address|
  // dirty. |object| is the object being stored into, |value| is the
  // object being stored. The address and value registers are clobbered by the
  // operation. RecordWrite filters out smis so it does not update the
  // write barrier if the value is a smi.
  void RecordWrite(Register object, Register address, Register value,
                   SaveFPRegsMode save_fp,
                   SmiCheck smi_check = SmiCheck::kInline);
 
  // Allocates an EXIT/BUILTIN_EXIT/API_CALLBACK_EXIT frame with given number
  // of slots in non-GCed area.
  void EnterExitFrame(int extra_slots, StackFrame::Type frame_type,
                      Register c_function);
  void LeaveExitFrame(Register scratch);
 
  // Load the global proxy from the current context.
  void LoadGlobalProxy(Register dst);
 
  // Load a value from the native context with a given index.
  void LoadNativeContextSlot(Register dst, int index);
 
  // ---------------------------------------------------------------------------
  // JavaScript invokes
 
  // Invoke the JavaScript function code by either calling or jumping.
 
  void InvokeFunctionCode(Register function, Register new_target,
                          Register expected_parameter_count,
                          Register actual_parameter_count, InvokeType type);
 
  // On function call, call into the debugger.
  // This may clobber ecx.
  void CallDebugOnFunctionCall(Register fun, Register new_target,
                               Register expected_parameter_count,
                               Register actual_parameter_count);
 
  // Invoke the JavaScript function in the given register. Changes the
  // current context to the context in the function before invoking.
  void InvokeFunction(Register function, Register new_target,
                      Register actual_parameter_count, InvokeType type);
 
  // Compare object type for heap object.
  // Incoming register is heap_object and outgoing register is map.
  void CmpObjectType(Register heap_object, InstanceType type, Register map);
 
  // Compare instance type for map.
  void CmpInstanceType(Register map, InstanceType type);
 
  // Compare instance type ranges for a map (lower_limit and higher_limit
  // inclusive).
  //
  // Always use unsigned comparisons: below_equal for a positive
  // result.
  void CmpInstanceTypeRange(Register map, Register instance_type_out,
                            Register scratch, InstanceType lower_limit,
                            InstanceType higher_limit);
 
  // Smi tagging support.
  void SmiTag(Register reg) {
    static_assert(kSmiTag == 0);
    static_assert(kSmiTagSize == 1);
    add(reg, reg);
  }
 
  // Simple comparison of smis.  Both sides must be known smis to use these,
  // otherwise use Cmp.
  void SmiCompare(Register smi1, Register smi2);
  void SmiCompare(Register dst, Tagged<Smi> src);
  void SmiCompare(Register dst, Operand src);
  void SmiCompare(Operand dst, Register src);
  void SmiCompare(Operand dst, Smi src);
 
  // Jump if register contain a non-smi.
  inline void JumpIfNotSmi(Register value, Label* not_smi_label,
                           Label::Distance distance = Label::kFar) {
    test(value, Immediate(kSmiTagMask));
    j(not_zero, not_smi_label, distance);
  }
  // Jump if the operand is not a smi.
  inline void JumpIfNotSmi(Operand value, Label* smi_label,
                           Label::Distance distance = Label::kFar) {
    test(value, Immediate(kSmiTagMask));
    j(not_zero, smi_label, distance);
  }
 
  template <typename Field>
  void DecodeField(Register reg) {
    static const int shift = Field::kShift;
    static const int mask = Field::kMask >> Field::kShift;
    if (shift != 0) {
      sar(reg, shift);
    }
    and_(reg, Immediate(mask));
  }
 
  void TestCodeIsMarkedForDeoptimization(Register code);
  Immediate ClearedValue() const;
 
  // Tiering support.
  void AssertFeedbackCell(Register object,
                          Register scratch) NOOP_UNLESS_DEBUG_CODE;
  void AssertFeedbackVector(Register object,
                            Register scratch) NOOP_UNLESS_DEBUG_CODE;
  void ReplaceClosureCodeWithOptimizedCode(Register optimized_code,
                                           Register closure, Register scratch1,
                                           Register slot_address);
  void GenerateTailCallToReturnedCode(Runtime::FunctionId function_id);
  void LoadFeedbackVectorFlagsAndJumpIfNeedsProcessing(
      Register flags, XMMRegister saved_feedback_vector,
      CodeKind current_code_kind, Label* flags_need_processing);
  void OptimizeCodeOrTailCallOptimizedCodeSlot(
      Register flags, XMMRegister saved_feedback_vector);
 
  // Abort execution if argument is not a smi, enabled via --debug-code.
  void AssertSmi(Register object) NOOP_UNLESS_DEBUG_CODE;
  void AssertSmi(Operand object) NOOP_UNLESS_DEBUG_CODE;
 
  // Abort execution if argument is a smi, enabled via --debug-code.
  void AssertNotSmi(Register object) NOOP_UNLESS_DEBUG_CODE;
 
  // Abort execution if argument is not a JSFunction, enabled via --debug-code.
  void AssertFunction(Register object, Register scratch) NOOP_UNLESS_DEBUG_CODE;
 
  // Abort execution if argument is not a callable JSFunction, enabled via
  // --debug-code.
  void AssertCallableFunction(Register object,
                              Register scratch) NOOP_UNLESS_DEBUG_CODE;
 
  // Abort execution if argument is not a Constructor, enabled via --debug-code.
  void AssertConstructor(Register object) NOOP_UNLESS_DEBUG_CODE;
 
  // Abort execution if argument is not a JSBoundFunction,
  // enabled via --debug-code.
  void AssertBoundFunction(Register object) NOOP_UNLESS_DEBUG_CODE;
 
  // Abort execution if argument is not a JSGeneratorObject (or subclass),
  // enabled via --debug-code.
  void AssertGeneratorObject(Register object) NOOP_UNLESS_DEBUG_CODE;
 
  // Abort execution if argument is not undefined or an AllocationSite, enabled
  // via --debug-code.
  void AssertUndefinedOrAllocationSite(Register object,
                                       Register scratch) NOOP_UNLESS_DEBUG_CODE;
 
  void AssertJSAny(Register object, Register map_tmp,
                   AbortReason abort_reason) NOOP_UNLESS_DEBUG_CODE;
 
  // ---------------------------------------------------------------------------
  // Exception handling
 
  // Push a new stack handler and link it into stack handler chain.
  void PushStackHandler(Register scratch);
 
  // Unlink the stack handler on top of the stack from the stack handler chain.
  void PopStackHandler(Register scratch);
 
  // ---------------------------------------------------------------------------
  // Runtime calls
 
  // Call a runtime routine.
  void CallRuntime(const Runtime::Function* f, int num_arguments);
 
  // Convenience function: Same as above, but takes the fid instead.
  void CallRuntime(Runtime::FunctionId fid) {
    const Runtime::Function* function = Runtime::FunctionForId(fid);
    CallRuntime(function, function->nargs);
  }
 
  // Convenience function: Same as above, but takes the fid instead.
  void CallRuntime(Runtime::FunctionId fid, int num_arguments) {
    CallRuntime(Runtime::FunctionForId(fid), num_arguments);
  }
 
  // Convenience function: tail call a runtime routine (jump).
  void TailCallRuntime(Runtime::FunctionId fid);
 
  // Jump to a runtime routine.
  void JumpToExternalReference(const ExternalReference& ext,
                               bool builtin_exit_frame = false);
 
  // ---------------------------------------------------------------------------
  // Utilities
 
  // Emit code to discard a non-negative number of pointer-sized elements
  // from the stack, clobbering only the esp register.
  void Drop(int element_count);
 
  // ---------------------------------------------------------------------------
  // In-place weak references.
  void LoadWeakValue(Register in_out, Label* target_if_cleared);
 
  // ---------------------------------------------------------------------------
  // StatsCounter support
 
  void IncrementCounter(StatsCounter* counter, int value, Register scratch) {
    if (!v8_flags.native_code_counters) return;
    EmitIncrementCounter(counter, value, scratch);
  }
  void EmitIncrementCounter(StatsCounter* counter, int value, Register scratch);
  void DecrementCounter(StatsCounter* counter, int value, Register scratch) {
    if (!v8_flags.native_code_counters) return;
    EmitDecrementCounter(counter, value, scratch);
  }
  void EmitDecrementCounter(StatsCounter* counter, int value, Register scratch);
 
  // ---------------------------------------------------------------------------
  // Stack limit utilities
  void CompareStackLimit(Register with, StackLimitKind kind);
  Operand StackLimitAsOperand(StackLimitKind kind);
 
  void StackOverflowCheck(Register num_args, Register scratch,
                          Label* stack_overflow, bool include_receiver = false);
 
 protected:
  // Drops arguments assuming that the return address was already popped.
  void DropArguments(Register count);
 
 private:
  // Helper functions for generating invokes.
  void InvokePrologue(Register expected_parameter_count,
                      Register actual_parameter_count, InvokeType type);
 
  DISALLOW_IMPLICIT_CONSTRUCTORS(MacroAssembler);
};
 
// -----------------------------------------------------------------------------
// Static helper functions.
 
// Generate an Operand for loading a field from an object.
inline Operand FieldOperand(Register object, int offset) {
  return Operand(object, offset - kHeapObjectTag);
}
 
// Generate an Operand for loading an indexed field from an object.
inline Operand FieldOperand(Register object, Register index, ScaleFactor scale,
                            int offset) {
  return Operand(object, index, scale, offset - kHeapObjectTag);
}
 
// Provides access to exit frame stack space (not GC-ed).
inline Operand ExitFrameStackSlotOperand(int offset) {
  return Operand(esp, offset);
}
 
// Provides access to exit frame parameters (GC-ed).
inline Operand ExitFrameCallerStackSlotOperand(int index) {
  return Operand(ebp,
                 (BuiltinExitFrameConstants::kFixedSlotCountAboveFp + index) *
                     kSystemPointerSize);
}
 
struct MoveCycleState {
  // Whether a move in the cycle needs the double scratch register.
  bool pending_double_scratch_register_use = false;
};
 
// Calls an API function. Allocates HandleScope, extracts returned value
// from handle and propagates exceptions. Clobbers C argument registers
// and C caller-saved registers. Restores context. On return removes
//   (*argc_operand + slots_to_drop_on_return) * kSystemPointerSize
// (GCed, includes the call JS arguments space and the additional space
// allocated for the fast call).
void CallApiFunctionAndReturn(MacroAssembler* masm, bool with_profiling,
                              Register function_address,
                              ExternalReference thunk_ref, Register thunk_arg,
                              int slots_to_drop_on_return,
                              MemOperand* argc_operand,
                              MemOperand return_value_operand);
 
#define ACCESS_MASM(masm) masm->
 
}  // namespace internal
}  // namespace v8
 
#endif  // V8_CODEGEN_IA32_MACRO_ASSEMBLER_IA32_H_