src/ia32/assembler-ia32-inl.h - platform/external/v8 - Git at Google

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
 // - Redistribution 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 Sun Microsystems or the names of 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.

 // The original source code covered by the above license above has been
 // modified significantly by Google Inc.
 // Copyright 2006-2008 the V8 project authors. All rights reserved.

 // A light-weight IA32 Assembler.

 #ifndef V8_IA32_ASSEMBLER_IA32_INL_H_
 #define V8_IA32_ASSEMBLER_IA32_INL_H_

 #include "cpu.h"
 #include "debug.h"

 namespace v8 {
 namespace internal {


 // The modes possibly affected by apply must be in kApplyMask.
 void RelocInfo::apply(intptr_t delta) {
   if (rmode_ == RUNTIME_ENTRY || IsCodeTarget(rmode_)) {
     int32_t* p = reinterpret_cast<int32_t*>(pc_);
     *p -= delta;  // Relocate entry.
   } else if (rmode_ == JS_RETURN && IsPatchedReturnSequence()) {
     // Special handling of js_return when a break point is set (call
     // instruction has been inserted).
     int32_t* p = reinterpret_cast<int32_t*>(pc_ + 1);
     *p -= delta;  // Relocate entry.
   } else if (rmode_ == DEBUG_BREAK_SLOT && IsPatchedDebugBreakSlotSequence()) {
     // Special handling of a debug break slot when a break point is set (call
     // instruction has been inserted).
     int32_t* p = reinterpret_cast<int32_t*>(pc_ + 1);
     *p -= delta;  // Relocate entry.
   } else if (IsInternalReference(rmode_)) {
     // absolute code pointer inside code object moves with the code object.
     int32_t* p = reinterpret_cast<int32_t*>(pc_);
     *p += delta;  // Relocate entry.
   }
 }


 Address RelocInfo::target_address() {
   ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY);
   return Assembler::target_address_at(pc_);
 }


 Address RelocInfo::target_address_address() {
   ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY);
   return reinterpret_cast<Address>(pc_);
 }


 int RelocInfo::target_address_size() {
   return Assembler::kExternalTargetSize;
 }


 void RelocInfo::set_target_address(Address target) {
   ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY);
   Assembler::set_target_address_at(pc_, target);
 }


 Object* RelocInfo::target_object() {
   ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
   return Memory::Object_at(pc_);
 }


 Handle<Object> RelocInfo::target_object_handle(Assembler* origin) {
   ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
   return Memory::Object_Handle_at(pc_);
 }


 Object** RelocInfo::target_object_address() {
   ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
   return &Memory::Object_at(pc_);
 }


 void RelocInfo::set_target_object(Object* target) {
   ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
   Memory::Object_at(pc_) = target;
 }


 Address* RelocInfo::target_reference_address() {
   ASSERT(rmode_ == RelocInfo::EXTERNAL_REFERENCE);
   return reinterpret_cast<Address*>(pc_);
 }


 Address RelocInfo::call_address() {
   ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
          (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
   return Assembler::target_address_at(pc_ + 1);
 }


 void RelocInfo::set_call_address(Address target) {
   ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
          (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
   Assembler::set_target_address_at(pc_ + 1, target);
 }


 Object* RelocInfo::call_object() {
   return *call_object_address();
 }


 void RelocInfo::set_call_object(Object* target) {
   *call_object_address() = target;
 }


 Object** RelocInfo::call_object_address() {
   ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
          (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
   return reinterpret_cast<Object**>(pc_ + 1);
 }


 bool RelocInfo::IsPatchedReturnSequence() {
   return *pc_ == 0xE8;
 }


 bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
   return !Assembler::IsNop(pc());
 }


 void RelocInfo::Visit(ObjectVisitor* visitor) {
   RelocInfo::Mode mode = rmode();
   if (mode == RelocInfo::EMBEDDED_OBJECT) {
     visitor->VisitPointer(target_object_address());
   } else if (RelocInfo::IsCodeTarget(mode)) {
     visitor->VisitCodeTarget(this);
   } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
     visitor->VisitExternalReference(target_reference_address());
 #ifdef ENABLE_DEBUGGER_SUPPORT
   } else if (Debug::has_break_points() &&
              ((RelocInfo::IsJSReturn(mode) &&
               IsPatchedReturnSequence()) ||
              (RelocInfo::IsDebugBreakSlot(mode) &&
               IsPatchedDebugBreakSlotSequence()))) {
     visitor->VisitDebugTarget(this);
 #endif
   } else if (mode == RelocInfo::RUNTIME_ENTRY) {
     visitor->VisitRuntimeEntry(this);
   }
 }


 template<typename StaticVisitor>
 void RelocInfo::Visit() {
   RelocInfo::Mode mode = rmode();
   if (mode == RelocInfo::EMBEDDED_OBJECT) {
     StaticVisitor::VisitPointer(target_object_address());
   } else if (RelocInfo::IsCodeTarget(mode)) {
     StaticVisitor::VisitCodeTarget(this);
   } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
     StaticVisitor::VisitExternalReference(target_reference_address());
 #ifdef ENABLE_DEBUGGER_SUPPORT
   } else if (Debug::has_break_points() &&
              ((RelocInfo::IsJSReturn(mode) &&
               IsPatchedReturnSequence()) ||
              (RelocInfo::IsDebugBreakSlot(mode) &&
               IsPatchedDebugBreakSlotSequence()))) {
     StaticVisitor::VisitDebugTarget(this);
 #endif
   } else if (mode == RelocInfo::RUNTIME_ENTRY) {
     StaticVisitor::VisitRuntimeEntry(this);
   }
 }


 Immediate::Immediate(int x)  {
   x_ = x;
   rmode_ = RelocInfo::NONE;
 }


 Immediate::Immediate(const ExternalReference& ext) {
   x_ = reinterpret_cast<int32_t>(ext.address());
   rmode_ = RelocInfo::EXTERNAL_REFERENCE;
 }


 Immediate::Immediate(Label* internal_offset) {
   x_ = reinterpret_cast<int32_t>(internal_offset);
   rmode_ = RelocInfo::INTERNAL_REFERENCE;
 }


 Immediate::Immediate(Handle<Object> handle) {
   // Verify all Objects referred by code are NOT in new space.
   Object* obj = *handle;
   ASSERT(!Heap::InNewSpace(obj));
   if (obj->IsHeapObject()) {
     x_ = reinterpret_cast<intptr_t>(handle.location());
     rmode_ = RelocInfo::EMBEDDED_OBJECT;
   } else {
     // no relocation needed
     x_ =  reinterpret_cast<intptr_t>(obj);
     rmode_ = RelocInfo::NONE;
   }
 }


 Immediate::Immediate(Smi* value) {
   x_ = reinterpret_cast<intptr_t>(value);
   rmode_ = RelocInfo::NONE;
 }


 void Assembler::emit(uint32_t x) {
   *reinterpret_cast<uint32_t*>(pc_) = x;
   pc_ += sizeof(uint32_t);
 }


 void Assembler::emit(Handle<Object> handle) {
   // Verify all Objects referred by code are NOT in new space.
   Object* obj = *handle;
   ASSERT(!Heap::InNewSpace(obj));
   if (obj->IsHeapObject()) {
     emit(reinterpret_cast<intptr_t>(handle.location()),
          RelocInfo::EMBEDDED_OBJECT);
   } else {
     // no relocation needed
     emit(reinterpret_cast<intptr_t>(obj));
   }
 }


 void Assembler::emit(uint32_t x, RelocInfo::Mode rmode) {
   if (rmode != RelocInfo::NONE) RecordRelocInfo(rmode);
   emit(x);
 }


 void Assembler::emit(const Immediate& x) {
   if (x.rmode_ == RelocInfo::INTERNAL_REFERENCE) {
     Label* label = reinterpret_cast<Label*>(x.x_);
     emit_code_relative_offset(label);
     return;
   }
   if (x.rmode_ != RelocInfo::NONE) RecordRelocInfo(x.rmode_);
   emit(x.x_);
 }


 void Assembler::emit_code_relative_offset(Label* label) {
   if (label->is_bound()) {
     int32_t pos;
     pos = label->pos() + Code::kHeaderSize - kHeapObjectTag;
     emit(pos);
   } else {
     emit_disp(label, Displacement::CODE_RELATIVE);
   }
 }


 void Assembler::emit_w(const Immediate& x) {
   ASSERT(x.rmode_ == RelocInfo::NONE);
   uint16_t value = static_cast<uint16_t>(x.x_);
   reinterpret_cast<uint16_t*>(pc_)[0] = value;
   pc_ += sizeof(uint16_t);
 }


 Address Assembler::target_address_at(Address pc) {
   return pc + sizeof(int32_t) + *reinterpret_cast<int32_t*>(pc);
 }


 void Assembler::set_target_address_at(Address pc, Address target) {
   int32_t* p = reinterpret_cast<int32_t*>(pc);
   *p = target - (pc + sizeof(int32_t));
   CPU::FlushICache(p, sizeof(int32_t));
 }


 Displacement Assembler::disp_at(Label* L) {
   return Displacement(long_at(L->pos()));
 }


 void Assembler::disp_at_put(Label* L, Displacement disp) {
   long_at_put(L->pos(), disp.data());
 }


 void Assembler::emit_disp(Label* L, Displacement::Type type) {
   Displacement disp(L, type);
   L->link_to(pc_offset());
   emit(static_cast<int>(disp.data()));
 }


 void Operand::set_modrm(int mod, Register rm) {
   ASSERT((mod & -4) == 0);
   buf_[0] = mod << 6 | rm.code();
   len_ = 1;
 }


 void Operand::set_sib(ScaleFactor scale, Register index, Register base) {
   ASSERT(len_ == 1);
   ASSERT((scale & -4) == 0);
   // Use SIB with no index register only for base esp.
   ASSERT(!index.is(esp) || base.is(esp));
   buf_[1] = scale << 6 | index.code() << 3 | base.code();
   len_ = 2;
 }


 void Operand::set_disp8(int8_t disp) {
   ASSERT(len_ == 1 || len_ == 2);
   *reinterpret_cast<int8_t*>(&buf_[len_++]) = disp;
 }


 void Operand::set_dispr(int32_t disp, RelocInfo::Mode rmode) {
   ASSERT(len_ == 1 || len_ == 2);
   int32_t* p = reinterpret_cast<int32_t*>(&buf_[len_]);
   *p = disp;
   len_ += sizeof(int32_t);
   rmode_ = rmode;
 }

 Operand::Operand(Register reg) {
   // reg
   set_modrm(3, reg);
 }


 Operand::Operand(XMMRegister xmm_reg) {
   Register reg = { xmm_reg.code() };
   set_modrm(3, reg);
 }


 Operand::Operand(int32_t disp, RelocInfo::Mode rmode) {
   // [disp/r]
   set_modrm(0, ebp);
   set_dispr(disp, rmode);
 }

 } }  // namespace v8::internal

 #endif  // V8_IA32_ASSEMBLER_IA32_INL_H_
	// Copyright (c) 1994-2006 Sun Microsystems Inc.
	// 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.
	//
	// - Redistribution 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 Sun Microsystems or the names of 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.

	// The original source code covered by the above license above has been
	// modified significantly by Google Inc.
	// Copyright 2006-2008 the V8 project authors. All rights reserved.

	// A light-weight IA32 Assembler.

	#ifndef V8_IA32_ASSEMBLER_IA32_INL_H_
	#define V8_IA32_ASSEMBLER_IA32_INL_H_

	#include "cpu.h"
	#include "debug.h"

	namespace v8 {
	namespace internal {


	// The modes possibly affected by apply must be in kApplyMask.
	void RelocInfo::apply(intptr_t delta) {
	if (rmode_ == RUNTIME_ENTRY \|\| IsCodeTarget(rmode_)) {
	int32_t* p = reinterpret_cast<int32_t*>(pc_);
	*p -= delta; // Relocate entry.
	} else if (rmode_ == JS_RETURN && IsPatchedReturnSequence()) {
	// Special handling of js_return when a break point is set (call
	// instruction has been inserted).
	int32_t* p = reinterpret_cast<int32_t*>(pc_ + 1);
	*p -= delta; // Relocate entry.
	} else if (rmode_ == DEBUG_BREAK_SLOT && IsPatchedDebugBreakSlotSequence()) {
	// Special handling of a debug break slot when a break point is set (call
	// instruction has been inserted).
	int32_t* p = reinterpret_cast<int32_t*>(pc_ + 1);
	*p -= delta; // Relocate entry.
	} else if (IsInternalReference(rmode_)) {
	// absolute code pointer inside code object moves with the code object.
	int32_t* p = reinterpret_cast<int32_t*>(pc_);
	*p += delta; // Relocate entry.
	}
	}


	Address RelocInfo::target_address() {
	ASSERT(IsCodeTarget(rmode_) \|\| rmode_ == RUNTIME_ENTRY);
	return Assembler::target_address_at(pc_);
	}


	Address RelocInfo::target_address_address() {
	ASSERT(IsCodeTarget(rmode_) \|\| rmode_ == RUNTIME_ENTRY);
	return reinterpret_cast<Address>(pc_);
	}


	int RelocInfo::target_address_size() {
	return Assembler::kExternalTargetSize;
	}


	void RelocInfo::set_target_address(Address target) {
	ASSERT(IsCodeTarget(rmode_) \|\| rmode_ == RUNTIME_ENTRY);
	Assembler::set_target_address_at(pc_, target);
	}


	Object* RelocInfo::target_object() {
	ASSERT(IsCodeTarget(rmode_) \|\| rmode_ == EMBEDDED_OBJECT);
	return Memory::Object_at(pc_);
	}


	Handle<Object> RelocInfo::target_object_handle(Assembler* origin) {
	ASSERT(IsCodeTarget(rmode_) \|\| rmode_ == EMBEDDED_OBJECT);
	return Memory::Object_Handle_at(pc_);
	}


	Object** RelocInfo::target_object_address() {
	ASSERT(IsCodeTarget(rmode_) \|\| rmode_ == EMBEDDED_OBJECT);
	return &Memory::Object_at(pc_);
	}


	void RelocInfo::set_target_object(Object* target) {
	ASSERT(IsCodeTarget(rmode_) \|\| rmode_ == EMBEDDED_OBJECT);
	Memory::Object_at(pc_) = target;
	}


	Address* RelocInfo::target_reference_address() {
	ASSERT(rmode_ == RelocInfo::EXTERNAL_REFERENCE);
	return reinterpret_cast<Address*>(pc_);
	}


	Address RelocInfo::call_address() {
	ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) \|\|
	(IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
	return Assembler::target_address_at(pc_ + 1);
	}


	void RelocInfo::set_call_address(Address target) {
	ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) \|\|
	(IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
	Assembler::set_target_address_at(pc_ + 1, target);
	}


	Object* RelocInfo::call_object() {
	return *call_object_address();
	}


	void RelocInfo::set_call_object(Object* target) {
	*call_object_address() = target;
	}


	Object** RelocInfo::call_object_address() {
	ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) \|\|
	(IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
	return reinterpret_cast<Object**>(pc_ + 1);
	}


	bool RelocInfo::IsPatchedReturnSequence() {
	return *pc_ == 0xE8;
	}


	bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
	return !Assembler::IsNop(pc());
	}


	void RelocInfo::Visit(ObjectVisitor* visitor) {
	RelocInfo::Mode mode = rmode();
	if (mode == RelocInfo::EMBEDDED_OBJECT) {
	visitor->VisitPointer(target_object_address());
	} else if (RelocInfo::IsCodeTarget(mode)) {
	visitor->VisitCodeTarget(this);
	} else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
	visitor->VisitExternalReference(target_reference_address());
	#ifdef ENABLE_DEBUGGER_SUPPORT
	} else if (Debug::has_break_points() &&
	((RelocInfo::IsJSReturn(mode) &&
	IsPatchedReturnSequence()) \|\|
	(RelocInfo::IsDebugBreakSlot(mode) &&
	IsPatchedDebugBreakSlotSequence()))) {
	visitor->VisitDebugTarget(this);
	#endif
	} else if (mode == RelocInfo::RUNTIME_ENTRY) {
	visitor->VisitRuntimeEntry(this);
	}
	}


	template<typename StaticVisitor>
	void RelocInfo::Visit() {
	RelocInfo::Mode mode = rmode();
	if (mode == RelocInfo::EMBEDDED_OBJECT) {
	StaticVisitor::VisitPointer(target_object_address());
	} else if (RelocInfo::IsCodeTarget(mode)) {
	StaticVisitor::VisitCodeTarget(this);
	} else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
	StaticVisitor::VisitExternalReference(target_reference_address());
	#ifdef ENABLE_DEBUGGER_SUPPORT
	} else if (Debug::has_break_points() &&
	((RelocInfo::IsJSReturn(mode) &&
	IsPatchedReturnSequence()) \|\|
	(RelocInfo::IsDebugBreakSlot(mode) &&
	IsPatchedDebugBreakSlotSequence()))) {
	StaticVisitor::VisitDebugTarget(this);
	#endif
	} else if (mode == RelocInfo::RUNTIME_ENTRY) {
	StaticVisitor::VisitRuntimeEntry(this);
	}
	}



	Immediate::Immediate(int x) {
	x_ = x;
	rmode_ = RelocInfo::NONE;
	}


	Immediate::Immediate(const ExternalReference& ext) {
	x_ = reinterpret_cast<int32_t>(ext.address());
	rmode_ = RelocInfo::EXTERNAL_REFERENCE;
	}


	Immediate::Immediate(Label* internal_offset) {
	x_ = reinterpret_cast<int32_t>(internal_offset);
	rmode_ = RelocInfo::INTERNAL_REFERENCE;
	}


	Immediate::Immediate(Handle<Object> handle) {
	// Verify all Objects referred by code are NOT in new space.
	Object* obj = *handle;
	ASSERT(!Heap::InNewSpace(obj));
	if (obj->IsHeapObject()) {
	x_ = reinterpret_cast<intptr_t>(handle.location());
	rmode_ = RelocInfo::EMBEDDED_OBJECT;
	} else {
	// no relocation needed
	x_ = reinterpret_cast<intptr_t>(obj);
	rmode_ = RelocInfo::NONE;
	}
	}


	Immediate::Immediate(Smi* value) {
	x_ = reinterpret_cast<intptr_t>(value);
	rmode_ = RelocInfo::NONE;
	}


	void Assembler::emit(uint32_t x) {
	reinterpret_cast<uint32_t>(pc_) = x;
	pc_ += sizeof(uint32_t);
	}


	void Assembler::emit(Handle<Object> handle) {
	// Verify all Objects referred by code are NOT in new space.
	Object* obj = *handle;
	ASSERT(!Heap::InNewSpace(obj));
	if (obj->IsHeapObject()) {
	emit(reinterpret_cast<intptr_t>(handle.location()),
	RelocInfo::EMBEDDED_OBJECT);
	} else {
	// no relocation needed
	emit(reinterpret_cast<intptr_t>(obj));
	}
	}


	void Assembler::emit(uint32_t x, RelocInfo::Mode rmode) {
	if (rmode != RelocInfo::NONE) RecordRelocInfo(rmode);
	emit(x);
	}


	void Assembler::emit(const Immediate& x) {
	if (x.rmode_ == RelocInfo::INTERNAL_REFERENCE) {
	Label* label = reinterpret_cast<Label*>(x.x_);
	emit_code_relative_offset(label);
	return;
	}
	if (x.rmode_ != RelocInfo::NONE) RecordRelocInfo(x.rmode_);
	emit(x.x_);
	}


	void Assembler::emit_code_relative_offset(Label* label) {
	if (label->is_bound()) {
	int32_t pos;
	pos = label->pos() + Code::kHeaderSize - kHeapObjectTag;
	emit(pos);
	} else {
	emit_disp(label, Displacement::CODE_RELATIVE);
	}
	}


	void Assembler::emit_w(const Immediate& x) {
	ASSERT(x.rmode_ == RelocInfo::NONE);
	uint16_t value = static_cast<uint16_t>(x.x_);
	reinterpret_cast<uint16_t*>(pc_)[0] = value;
	pc_ += sizeof(uint16_t);
	}


	Address Assembler::target_address_at(Address pc) {
	return pc + sizeof(int32_t) + reinterpret_cast<int32_t>(pc);
	}


	void Assembler::set_target_address_at(Address pc, Address target) {
	int32_t* p = reinterpret_cast<int32_t*>(pc);
	*p = target - (pc + sizeof(int32_t));
	CPU::FlushICache(p, sizeof(int32_t));
	}


	Displacement Assembler::disp_at(Label* L) {
	return Displacement(long_at(L->pos()));
	}


	void Assembler::disp_at_put(Label* L, Displacement disp) {
	long_at_put(L->pos(), disp.data());
	}


	void Assembler::emit_disp(Label* L, Displacement::Type type) {
	Displacement disp(L, type);
	L->link_to(pc_offset());
	emit(static_cast<int>(disp.data()));
	}


	void Operand::set_modrm(int mod, Register rm) {
	ASSERT((mod & -4) == 0);
	buf_[0] = mod << 6 \| rm.code();
	len_ = 1;
	}


	void Operand::set_sib(ScaleFactor scale, Register index, Register base) {
	ASSERT(len_ == 1);
	ASSERT((scale & -4) == 0);
	// Use SIB with no index register only for base esp.
	ASSERT(!index.is(esp) \|\| base.is(esp));
	buf_[1] = scale << 6 \| index.code() << 3 \| base.code();
	len_ = 2;
	}


	void Operand::set_disp8(int8_t disp) {
	ASSERT(len_ == 1 \|\| len_ == 2);
	reinterpret_cast<int8_t>(&buf_[len_++]) = disp;
	}


	void Operand::set_dispr(int32_t disp, RelocInfo::Mode rmode) {
	ASSERT(len_ == 1 \|\| len_ == 2);
	int32_t* p = reinterpret_cast<int32_t*>(&buf_[len_]);
	*p = disp;
	len_ += sizeof(int32_t);
	rmode_ = rmode;
	}

	Operand::Operand(Register reg) {
	// reg
	set_modrm(3, reg);
	}


	Operand::Operand(XMMRegister xmm_reg) {
	Register reg = { xmm_reg.code() };
	set_modrm(3, reg);
	}


	Operand::Operand(int32_t disp, RelocInfo::Mode rmode) {
	// [disp/r]
	set_modrm(0, ebp);
	set_dispr(disp, rmode);
	}

	} } // namespace v8::internal

	#endif // V8_IA32_ASSEMBLER_IA32_INL_H_