V8Binding/v8/src/ia32/macro-assembler-ia32.h - platform/external/webkit - Git at Google

 // Copyright 2006-2009 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.

 #ifndef V8_IA32_MACRO_ASSEMBLER_IA32_H_
 #define V8_IA32_MACRO_ASSEMBLER_IA32_H_

 #include "assembler.h"

 namespace v8 {
 namespace internal {

 // Forward declaration.
 class JumpTarget;


 // MacroAssembler implements a collection of frequently used macros.
 class MacroAssembler: public Assembler {
  public:
   MacroAssembler(void* buffer, int size);

   // ---------------------------------------------------------------------------
   // GC Support

   // Set the remembered set bit for [object+offset].
   // object is the object being stored into, value is the object being stored.
   // If offset is zero, then the scratch register contains the array index into
   // the elements array represented as a Smi.
   // All registers are clobbered by the operation.
   void RecordWrite(Register object,
                    int offset,
                    Register value,
                    Register scratch);

 #ifdef ENABLE_DEBUGGER_SUPPORT
   // ---------------------------------------------------------------------------
   // Debugger Support

   void SaveRegistersToMemory(RegList regs);
   void RestoreRegistersFromMemory(RegList regs);
   void PushRegistersFromMemory(RegList regs);
   void PopRegistersToMemory(RegList regs);
   void CopyRegistersFromStackToMemory(Register base,
                                       Register scratch,
                                       RegList regs);
 #endif

   // ---------------------------------------------------------------------------
   // Activation frames

   void EnterInternalFrame() { EnterFrame(StackFrame::INTERNAL); }
   void LeaveInternalFrame() { LeaveFrame(StackFrame::INTERNAL); }

   void EnterConstructFrame() { EnterFrame(StackFrame::CONSTRUCT); }
   void LeaveConstructFrame() { LeaveFrame(StackFrame::CONSTRUCT); }

   // Enter specific kind of exit frame; either EXIT or
   // EXIT_DEBUG. Expects the number of arguments in register eax and
   // sets up the number of arguments in register edi and the pointer
   // to the first argument in register esi.
   void EnterExitFrame(StackFrame::Type type);

   // Leave the current exit frame. Expects the return value in
   // register eax:edx (untouched) and the pointer to the first
   // argument in register esi.
   void LeaveExitFrame(StackFrame::Type type);


   // ---------------------------------------------------------------------------
   // JavaScript invokes

   // Invoke the JavaScript function code by either calling or jumping.
   void InvokeCode(const Operand& code,
                   const ParameterCount& expected,
                   const ParameterCount& actual,
                   InvokeFlag flag);

   void InvokeCode(Handle<Code> code,
                   const ParameterCount& expected,
                   const ParameterCount& actual,
                   RelocInfo::Mode rmode,
                   InvokeFlag flag);

   // Invoke the JavaScript function in the given register. Changes the
   // current context to the context in the function before invoking.
   void InvokeFunction(Register function,
                       const ParameterCount& actual,
                       InvokeFlag flag);

   // Invoke specified builtin JavaScript function. Adds an entry to
   // the unresolved list if the name does not resolve.
   void InvokeBuiltin(Builtins::JavaScript id, InvokeFlag flag);

   // Store the code object for the given builtin in the target register.
   void GetBuiltinEntry(Register target, Builtins::JavaScript id);

   // Expression support
   void Set(Register dst, const Immediate& x);
   void Set(const Operand& dst, const Immediate& x);

   // 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);

   // FCmp is similar to integer cmp, but requires unsigned
   // jcc instructions (je, ja, jae, jb, jbe, je, and jz).
   void FCmp();

   // ---------------------------------------------------------------------------
   // Exception handling

   // Push a new try handler and link into try handler chain.  The return
   // address must be pushed before calling this helper.
   void PushTryHandler(CodeLocation try_location, HandlerType type);


   // ---------------------------------------------------------------------------
   // Inline caching support

   // Generates code that verifies that the maps of objects in the
   // prototype chain of object hasn't changed since the code was
   // generated and branches to the miss label if any map has. If
   // necessary the function also generates code for security check
   // in case of global object holders. The scratch and holder
   // registers are always clobbered, but the object register is only
   // clobbered if it the same as the holder register. The function
   // returns a register containing the holder - either object_reg or
   // holder_reg.
   Register CheckMaps(JSObject* object, Register object_reg,
                      JSObject* holder, Register holder_reg,
                      Register scratch, Label* miss);

   // Generate code for checking access rights - used for security checks
   // on access to global objects across environments. The holder register
   // is left untouched, but the scratch register is clobbered.
   void CheckAccessGlobalProxy(Register holder_reg,
                               Register scratch,
                               Label* miss);


   // ---------------------------------------------------------------------------
   // Allocation support

   // Allocate an object in new space. If the new space is exhausted control
   // continues at the gc_required label. The allocated object is returned in
   // result and end of the new object is returned in result_end. The register
   // scratch can be passed as no_reg in which case an additional object
   // reference will be added to the reloc info. The returned pointers in result
   // and result_end have not yet been tagged as heap objects. If
   // result_contains_top_on_entry is true the contnt of result is known to be
   // the allocation top on entry (could be result_end from a previous call to
   // AllocateObjectInNewSpace). If result_contains_top_on_entry is true scratch
   // should be no_reg as it is never used.
   void AllocateObjectInNewSpace(int object_size,
                                 Register result,
                                 Register result_end,
                                 Register scratch,
                                 Label* gc_required,
                                 AllocationFlags flags);

   void AllocateObjectInNewSpace(int header_size,
                                 ScaleFactor element_size,
                                 Register element_count,
                                 Register result,
                                 Register result_end,
                                 Register scratch,
                                 Label* gc_required,
                                 AllocationFlags flags);

   void AllocateObjectInNewSpace(Register object_size,
                                 Register result,
                                 Register result_end,
                                 Register scratch,
                                 Label* gc_required,
                                 AllocationFlags flags);

   // Undo allocation in new space. The object passed and objects allocated after
   // it will no longer be allocated. Make sure that no pointers are left to the
   // object(s) no longer allocated as they would be invalid when allocation is
   // un-done.
   void UndoAllocationInNewSpace(Register object);

   // ---------------------------------------------------------------------------
   // Support functions.

   // Check if result is zero and op is negative.
   void NegativeZeroTest(Register result, Register op, Label* then_label);

   // Check if result is zero and op is negative in code using jump targets.
   void NegativeZeroTest(CodeGenerator* cgen,
                         Register result,
                         Register op,
                         JumpTarget* then_target);

   // Check if result is zero and any of op1 and op2 are negative.
   // Register scratch is destroyed, and it must be different from op2.
   void NegativeZeroTest(Register result, Register op1, Register op2,
                         Register scratch, Label* then_label);

   // Try to get function prototype of a function and puts the value in
   // the result register. Checks that the function really is a
   // function and jumps to the miss label if the fast checks fail. The
   // function register will be untouched; the other registers may be
   // clobbered.
   void TryGetFunctionPrototype(Register function,
                                Register result,
                                Register scratch,
                                Label* miss);

   // Generates code for reporting that an illegal operation has
   // occurred.
   void IllegalOperation(int num_arguments);

   // ---------------------------------------------------------------------------
   // Runtime calls

   // Call a code stub.
   void CallStub(CodeStub* stub);

   // Return from a code stub after popping its arguments.
   void StubReturn(int argc);

   // Call a runtime routine.
   // Eventually this should be used for all C calls.
   void CallRuntime(Runtime::Function* f, int num_arguments);

   // Convenience function: Same as above, but takes the fid instead.
   void CallRuntime(Runtime::FunctionId id, int num_arguments);

   // Tail call of a runtime routine (jump).
   // Like JumpToBuiltin, but also takes care of passing the number
   // of arguments.
   void TailCallRuntime(const ExternalReference& ext, int num_arguments);

   // Jump to the builtin routine.
   void JumpToBuiltin(const ExternalReference& ext);


   // ---------------------------------------------------------------------------
   // Utilities

   void Ret();

   struct Unresolved {
     int pc;
     uint32_t flags;  // see Bootstrapper::FixupFlags decoders/encoders.
     const char* name;
   };
   List<Unresolved>* unresolved() { return &unresolved_; }

   Handle<Object> CodeObject() { return code_object_; }


   // ---------------------------------------------------------------------------
   // StatsCounter support

   void SetCounter(StatsCounter* counter, int value);
   void IncrementCounter(StatsCounter* counter, int value);
   void DecrementCounter(StatsCounter* counter, int value);


   // ---------------------------------------------------------------------------
   // Debugging

   // Calls Abort(msg) if the condition cc is not satisfied.
   // Use --debug_code to enable.
   void Assert(Condition cc, const char* msg);

   // Like Assert(), but always enabled.
   void Check(Condition cc, const char* msg);

   // Print a message to stdout and abort execution.
   void Abort(const char* msg);

   // Verify restrictions about code generated in stubs.
   void set_generating_stub(bool value) { generating_stub_ = value; }
   bool generating_stub() { return generating_stub_; }
   void set_allow_stub_calls(bool value) { allow_stub_calls_ = value; }
   bool allow_stub_calls() { return allow_stub_calls_; }

  private:
   List<Unresolved> unresolved_;
   bool generating_stub_;
   bool allow_stub_calls_;
   Handle<Object> code_object_;  // This handle will be patched with the
                                 // code object on installation.

   // Helper functions for generating invokes.
   void InvokePrologue(const ParameterCount& expected,
                       const ParameterCount& actual,
                       Handle<Code> code_constant,
                       const Operand& code_operand,
                       Label* done,
                       InvokeFlag flag);

   // Get the code for the given builtin. Returns if able to resolve
   // the function in the 'resolved' flag.
   Handle<Code> ResolveBuiltin(Builtins::JavaScript id, bool* resolved);

   // Activation support.
   void EnterFrame(StackFrame::Type type);
   void LeaveFrame(StackFrame::Type type);

   // Allocation support helpers.
   void LoadAllocationTopHelper(Register result,
                                Register result_end,
                                Register scratch,
                                AllocationFlags flags);
   void UpdateAllocationTopHelper(Register result_end, Register scratch);
 };


 // The code patcher is used to patch (typically) small parts of code e.g. for
 // debugging and other types of instrumentation. When using the code patcher
 // the exact number of bytes specified must be emitted. Is not legal to emit
 // relocation information. If any of these constraints are violated it causes
 // an assertion.
 class CodePatcher {
  public:
   CodePatcher(byte* address, int size);
   virtual ~CodePatcher();

   // Macro assembler to emit code.
   MacroAssembler* masm() { return &masm_; }

  private:
   byte* address_;  // The address of the code being patched.
   int size_;  // Number of bytes of the expected patch size.
   MacroAssembler masm_;  // Macro assembler used to generate the code.
 };


 // -----------------------------------------------------------------------------
 // Static helper functions.

 // Generate an Operand for loading a field from an object.
 static inline Operand FieldOperand(Register object, int offset) {
   return Operand(object, offset - kHeapObjectTag);
 }


 // Generate an Operand for loading an indexed field from an object.
 static inline Operand FieldOperand(Register object,
                                    Register index,
                                    ScaleFactor scale,
                                    int offset) {
   return Operand(object, index, scale, offset - kHeapObjectTag);
 }


 #ifdef GENERATED_CODE_COVERAGE
 extern void LogGeneratedCodeCoverage(const char* file_line);
 #define CODE_COVERAGE_STRINGIFY(x) #x
 #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
 #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
 #define ACCESS_MASM(masm) {                                               \
     byte* ia32_coverage_function =                                        \
         reinterpret_cast<byte*>(FUNCTION_ADDR(LogGeneratedCodeCoverage)); \
     masm->pushfd();                                                       \
     masm->pushad();                                                       \
     masm->push(Immediate(reinterpret_cast<int>(&__FILE_LINE__)));         \
     masm->call(ia32_coverage_function, RelocInfo::RUNTIME_ENTRY);         \
     masm->pop(eax);                                                       \
     masm->popad();                                                        \
     masm->popfd();                                                        \
   }                                                                       \
   masm->
 #else
 #define ACCESS_MASM(masm) masm->
 #endif


 } }  // namespace v8::internal

 #endif  // V8_IA32_MACRO_ASSEMBLER_IA32_H_
	// Copyright 2006-2009 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.

	#ifndef V8_IA32_MACRO_ASSEMBLER_IA32_H_
	#define V8_IA32_MACRO_ASSEMBLER_IA32_H_

	#include "assembler.h"

	namespace v8 {
	namespace internal {

	// Forward declaration.
	class JumpTarget;


	// MacroAssembler implements a collection of frequently used macros.
	class MacroAssembler: public Assembler {
	public:
	MacroAssembler(void* buffer, int size);

	// ---------------------------------------------------------------------------
	// GC Support

	// Set the remembered set bit for [object+offset].
	// object is the object being stored into, value is the object being stored.
	// If offset is zero, then the scratch register contains the array index into
	// the elements array represented as a Smi.
	// All registers are clobbered by the operation.
	void RecordWrite(Register object,
	int offset,
	Register value,
	Register scratch);

	#ifdef ENABLE_DEBUGGER_SUPPORT
	// ---------------------------------------------------------------------------
	// Debugger Support

	void SaveRegistersToMemory(RegList regs);
	void RestoreRegistersFromMemory(RegList regs);
	void PushRegistersFromMemory(RegList regs);
	void PopRegistersToMemory(RegList regs);
	void CopyRegistersFromStackToMemory(Register base,
	Register scratch,
	RegList regs);
	#endif

	// ---------------------------------------------------------------------------
	// Activation frames

	void EnterInternalFrame() { EnterFrame(StackFrame::INTERNAL); }
	void LeaveInternalFrame() { LeaveFrame(StackFrame::INTERNAL); }

	void EnterConstructFrame() { EnterFrame(StackFrame::CONSTRUCT); }
	void LeaveConstructFrame() { LeaveFrame(StackFrame::CONSTRUCT); }

	// Enter specific kind of exit frame; either EXIT or
	// EXIT_DEBUG. Expects the number of arguments in register eax and
	// sets up the number of arguments in register edi and the pointer
	// to the first argument in register esi.
	void EnterExitFrame(StackFrame::Type type);

	// Leave the current exit frame. Expects the return value in
	// register eax:edx (untouched) and the pointer to the first
	// argument in register esi.
	void LeaveExitFrame(StackFrame::Type type);


	// ---------------------------------------------------------------------------
	// JavaScript invokes

	// Invoke the JavaScript function code by either calling or jumping.
	void InvokeCode(const Operand& code,
	const ParameterCount& expected,
	const ParameterCount& actual,
	InvokeFlag flag);

	void InvokeCode(Handle<Code> code,
	const ParameterCount& expected,
	const ParameterCount& actual,
	RelocInfo::Mode rmode,
	InvokeFlag flag);

	// Invoke the JavaScript function in the given register. Changes the
	// current context to the context in the function before invoking.
	void InvokeFunction(Register function,
	const ParameterCount& actual,
	InvokeFlag flag);

	// Invoke specified builtin JavaScript function. Adds an entry to
	// the unresolved list if the name does not resolve.
	void InvokeBuiltin(Builtins::JavaScript id, InvokeFlag flag);

	// Store the code object for the given builtin in the target register.
	void GetBuiltinEntry(Register target, Builtins::JavaScript id);

	// Expression support
	void Set(Register dst, const Immediate& x);
	void Set(const Operand& dst, const Immediate& x);

	// 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);

	// FCmp is similar to integer cmp, but requires unsigned
	// jcc instructions (je, ja, jae, jb, jbe, je, and jz).
	void FCmp();

	// ---------------------------------------------------------------------------
	// Exception handling

	// Push a new try handler and link into try handler chain. The return
	// address must be pushed before calling this helper.
	void PushTryHandler(CodeLocation try_location, HandlerType type);


	// ---------------------------------------------------------------------------
	// Inline caching support

	// Generates code that verifies that the maps of objects in the
	// prototype chain of object hasn't changed since the code was
	// generated and branches to the miss label if any map has. If
	// necessary the function also generates code for security check
	// in case of global object holders. The scratch and holder
	// registers are always clobbered, but the object register is only
	// clobbered if it the same as the holder register. The function
	// returns a register containing the holder - either object_reg or
	// holder_reg.
	Register CheckMaps(JSObject* object, Register object_reg,
	JSObject* holder, Register holder_reg,
	Register scratch, Label* miss);

	// Generate code for checking access rights - used for security checks
	// on access to global objects across environments. The holder register
	// is left untouched, but the scratch register is clobbered.
	void CheckAccessGlobalProxy(Register holder_reg,
	Register scratch,
	Label* miss);


	// ---------------------------------------------------------------------------
	// Allocation support

	// Allocate an object in new space. If the new space is exhausted control
	// continues at the gc_required label. The allocated object is returned in
	// result and end of the new object is returned in result_end. The register
	// scratch can be passed as no_reg in which case an additional object
	// reference will be added to the reloc info. The returned pointers in result
	// and result_end have not yet been tagged as heap objects. If
	// result_contains_top_on_entry is true the contnt of result is known to be
	// the allocation top on entry (could be result_end from a previous call to
	// AllocateObjectInNewSpace). If result_contains_top_on_entry is true scratch
	// should be no_reg as it is never used.
	void AllocateObjectInNewSpace(int object_size,
	Register result,
	Register result_end,
	Register scratch,
	Label* gc_required,
	AllocationFlags flags);

	void AllocateObjectInNewSpace(int header_size,
	ScaleFactor element_size,
	Register element_count,
	Register result,
	Register result_end,
	Register scratch,
	Label* gc_required,
	AllocationFlags flags);

	void AllocateObjectInNewSpace(Register object_size,
	Register result,
	Register result_end,
	Register scratch,
	Label* gc_required,
	AllocationFlags flags);

	// Undo allocation in new space. The object passed and objects allocated after
	// it will no longer be allocated. Make sure that no pointers are left to the
	// object(s) no longer allocated as they would be invalid when allocation is
	// un-done.
	void UndoAllocationInNewSpace(Register object);

	// ---------------------------------------------------------------------------
	// Support functions.

	// Check if result is zero and op is negative.
	void NegativeZeroTest(Register result, Register op, Label* then_label);

	// Check if result is zero and op is negative in code using jump targets.
	void NegativeZeroTest(CodeGenerator* cgen,
	Register result,
	Register op,
	JumpTarget* then_target);

	// Check if result is zero and any of op1 and op2 are negative.
	// Register scratch is destroyed, and it must be different from op2.
	void NegativeZeroTest(Register result, Register op1, Register op2,
	Register scratch, Label* then_label);

	// Try to get function prototype of a function and puts the value in
	// the result register. Checks that the function really is a
	// function and jumps to the miss label if the fast checks fail. The
	// function register will be untouched; the other registers may be
	// clobbered.
	void TryGetFunctionPrototype(Register function,
	Register result,
	Register scratch,
	Label* miss);

	// Generates code for reporting that an illegal operation has
	// occurred.
	void IllegalOperation(int num_arguments);

	// ---------------------------------------------------------------------------
	// Runtime calls

	// Call a code stub.
	void CallStub(CodeStub* stub);

	// Return from a code stub after popping its arguments.
	void StubReturn(int argc);

	// Call a runtime routine.
	// Eventually this should be used for all C calls.
	void CallRuntime(Runtime::Function* f, int num_arguments);

	// Convenience function: Same as above, but takes the fid instead.
	void CallRuntime(Runtime::FunctionId id, int num_arguments);

	// Tail call of a runtime routine (jump).
	// Like JumpToBuiltin, but also takes care of passing the number
	// of arguments.
	void TailCallRuntime(const ExternalReference& ext, int num_arguments);

	// Jump to the builtin routine.
	void JumpToBuiltin(const ExternalReference& ext);


	// ---------------------------------------------------------------------------
	// Utilities

	void Ret();

	struct Unresolved {
	int pc;
	uint32_t flags; // see Bootstrapper::FixupFlags decoders/encoders.
	const char* name;
	};
	List<Unresolved>* unresolved() { return &unresolved_; }

	Handle<Object> CodeObject() { return code_object_; }


	// ---------------------------------------------------------------------------
	// StatsCounter support

	void SetCounter(StatsCounter* counter, int value);
	void IncrementCounter(StatsCounter* counter, int value);
	void DecrementCounter(StatsCounter* counter, int value);


	// ---------------------------------------------------------------------------
	// Debugging

	// Calls Abort(msg) if the condition cc is not satisfied.
	// Use --debug_code to enable.
	void Assert(Condition cc, const char* msg);

	// Like Assert(), but always enabled.
	void Check(Condition cc, const char* msg);

	// Print a message to stdout and abort execution.
	void Abort(const char* msg);

	// Verify restrictions about code generated in stubs.
	void set_generating_stub(bool value) { generating_stub_ = value; }
	bool generating_stub() { return generating_stub_; }
	void set_allow_stub_calls(bool value) { allow_stub_calls_ = value; }
	bool allow_stub_calls() { return allow_stub_calls_; }

	private:
	List<Unresolved> unresolved_;
	bool generating_stub_;
	bool allow_stub_calls_;
	Handle<Object> code_object_; // This handle will be patched with the
	// code object on installation.

	// Helper functions for generating invokes.
	void InvokePrologue(const ParameterCount& expected,
	const ParameterCount& actual,
	Handle<Code> code_constant,
	const Operand& code_operand,
	Label* done,
	InvokeFlag flag);

	// Get the code for the given builtin. Returns if able to resolve
	// the function in the 'resolved' flag.
	Handle<Code> ResolveBuiltin(Builtins::JavaScript id, bool* resolved);

	// Activation support.
	void EnterFrame(StackFrame::Type type);
	void LeaveFrame(StackFrame::Type type);

	// Allocation support helpers.
	void LoadAllocationTopHelper(Register result,
	Register result_end,
	Register scratch,
	AllocationFlags flags);
	void UpdateAllocationTopHelper(Register result_end, Register scratch);
	};


	// The code patcher is used to patch (typically) small parts of code e.g. for
	// debugging and other types of instrumentation. When using the code patcher
	// the exact number of bytes specified must be emitted. Is not legal to emit
	// relocation information. If any of these constraints are violated it causes
	// an assertion.
	class CodePatcher {
	public:
	CodePatcher(byte* address, int size);
	virtual ~CodePatcher();

	// Macro assembler to emit code.
	MacroAssembler* masm() { return &masm_; }

	private:
	byte* address_; // The address of the code being patched.
	int size_; // Number of bytes of the expected patch size.
	MacroAssembler masm_; // Macro assembler used to generate the code.
	};


	// -----------------------------------------------------------------------------
	// Static helper functions.

	// Generate an Operand for loading a field from an object.
	static inline Operand FieldOperand(Register object, int offset) {
	return Operand(object, offset - kHeapObjectTag);
	}


	// Generate an Operand for loading an indexed field from an object.
	static inline Operand FieldOperand(Register object,
	Register index,
	ScaleFactor scale,
	int offset) {
	return Operand(object, index, scale, offset - kHeapObjectTag);
	}


	#ifdef GENERATED_CODE_COVERAGE
	extern void LogGeneratedCodeCoverage(const char* file_line);
	#define CODE_COVERAGE_STRINGIFY(x) #x
	#define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x)
	#define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__)
	#define ACCESS_MASM(masm) { \
	byte* ia32_coverage_function = \
	reinterpret_cast<byte*>(FUNCTION_ADDR(LogGeneratedCodeCoverage)); \
	masm->pushfd(); \
	masm->pushad(); \
	masm->push(Immediate(reinterpret_cast<int>(&__FILE_LINE__))); \
	masm->call(ia32_coverage_function, RelocInfo::RUNTIME_ENTRY); \
	masm->pop(eax); \
	masm->popad(); \
	masm->popfd(); \
	} \
	masm->
	#else
	#define ACCESS_MASM(masm) masm->
	#endif


	} } // namespace v8::internal

	#endif // V8_IA32_MACRO_ASSEMBLER_IA32_H_