src/mips/assembler-mips-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 2012 the V8 project authors. All rights reserved.


 #ifndef V8_MIPS_ASSEMBLER_MIPS_INL_H_
 #define V8_MIPS_ASSEMBLER_MIPS_INL_H_

 #include "mips/assembler-mips.h"

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


 namespace v8 {
 namespace internal {

 // -----------------------------------------------------------------------------
 // Operand and MemOperand.

 Operand::Operand(int32_t immediate, RelocInfo::Mode rmode)  {
   rm_ = no_reg;
   imm32_ = immediate;
   rmode_ = rmode;
 }


 Operand::Operand(const ExternalReference& f)  {
   rm_ = no_reg;
   imm32_ = reinterpret_cast<int32_t>(f.address());
   rmode_ = RelocInfo::EXTERNAL_REFERENCE;
 }


 Operand::Operand(Smi* value) {
   rm_ = no_reg;
   imm32_ =  reinterpret_cast<intptr_t>(value);
   rmode_ = RelocInfo::NONE;
 }


 Operand::Operand(Register rm) {
   rm_ = rm;
 }


 bool Operand::is_reg() const {
   return rm_.is_valid();
 }


 int FPURegister::ToAllocationIndex(FPURegister reg) {
   ASSERT(reg.code() % 2 == 0);
   ASSERT(reg.code() / 2 < kNumAllocatableRegisters);
   ASSERT(reg.is_valid());
   ASSERT(!reg.is(kDoubleRegZero));
   ASSERT(!reg.is(kLithiumScratchDouble));
   return (reg.code() / 2);
 }


 // -----------------------------------------------------------------------------
 // RelocInfo.

 void RelocInfo::apply(intptr_t delta) {
   if (IsCodeTarget(rmode_)) {
     uint32_t scope1 = (uint32_t) target_address() & ~kImm28Mask;
     uint32_t scope2 = reinterpret_cast<uint32_t>(pc_) & ~kImm28Mask;

     if (scope1 != scope2) {
       Assembler::JumpLabelToJumpRegister(pc_);
     }
   }
   if (IsInternalReference(rmode_)) {
     // Absolute code pointer inside code object moves with the code object.
     byte* p = reinterpret_cast<byte*>(pc_);
     int count = Assembler::RelocateInternalReference(p, delta);
     CPU::FlushICache(p, count * sizeof(uint32_t));
   }
 }


 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 ||
          rmode_ == EMBEDDED_OBJECT ||
          rmode_ == EXTERNAL_REFERENCE);
   // Read the address of the word containing the target_address in an
   // instruction stream.
   // The only architecture-independent user of this function is the serializer.
   // The serializer uses it to find out how many raw bytes of instruction to
   // output before the next target.
   // For an instruction like LUI/ORI where the target bits are mixed into the
   // instruction bits, the size of the target will be zero, indicating that the
   // serializer should not step forward in memory after a target is resolved
   // and written. In this case the target_address_address function should
   // return the end of the instructions to be patched, allowing the
   // deserializer to deserialize the instructions as raw bytes and put them in
   // place, ready to be patched with the target. After jump optimization,
   // that is the address of the instruction that follows J/JAL/JR/JALR
   // instruction.
   return reinterpret_cast<Address>(
     pc_ + Assembler::kInstructionsFor32BitConstant * Assembler::kInstrSize);
 }


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


 void RelocInfo::set_target_address(Address target, WriteBarrierMode mode) {
   ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY);
   Assembler::set_target_address_at(pc_, target);
   if (mode == UPDATE_WRITE_BARRIER && host() != NULL && IsCodeTarget(rmode_)) {
     Object* target_code = Code::GetCodeFromTargetAddress(target);
     host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(
         host(), this, HeapObject::cast(target_code));
   }
 }


 Object* RelocInfo::target_object() {
   ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
   return reinterpret_cast<Object*>(Assembler::target_address_at(pc_));
 }


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


 Object** RelocInfo::target_object_address() {
   // Provide a "natural pointer" to the embedded object,
   // which can be de-referenced during heap iteration.
   ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
   reconstructed_obj_ptr_ =
       reinterpret_cast<Object*>(Assembler::target_address_at(pc_));
   return &reconstructed_obj_ptr_;
 }


 void RelocInfo::set_target_object(Object* target, WriteBarrierMode mode) {
   ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
   Assembler::set_target_address_at(pc_, reinterpret_cast<Address>(target));
   if (mode == UPDATE_WRITE_BARRIER &&
       host() != NULL &&
       target->IsHeapObject()) {
     host()->GetHeap()->incremental_marking()->RecordWrite(
         host(), &Memory::Object_at(pc_), HeapObject::cast(target));
   }
 }


 Address* RelocInfo::target_reference_address() {
   ASSERT(rmode_ == EXTERNAL_REFERENCE);
   reconstructed_adr_ptr_ = Assembler::target_address_at(pc_);
   return &reconstructed_adr_ptr_;
 }


 Handle<JSGlobalPropertyCell> RelocInfo::target_cell_handle() {
   ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL);
   Address address = Memory::Address_at(pc_);
   return Handle<JSGlobalPropertyCell>(
       reinterpret_cast<JSGlobalPropertyCell**>(address));
 }


 JSGlobalPropertyCell* RelocInfo::target_cell() {
   ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL);
   Address address = Memory::Address_at(pc_);
   Object* object = HeapObject::FromAddress(
       address - JSGlobalPropertyCell::kValueOffset);
   return reinterpret_cast<JSGlobalPropertyCell*>(object);
 }


 void RelocInfo::set_target_cell(JSGlobalPropertyCell* cell,
                                 WriteBarrierMode mode) {
   ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL);
   Address address = cell->address() + JSGlobalPropertyCell::kValueOffset;
   Memory::Address_at(pc_) = address;
   if (mode == UPDATE_WRITE_BARRIER && host() != NULL) {
     // TODO(1550) We are passing NULL as a slot because cell can never be on
     // evacuation candidate.
     host()->GetHeap()->incremental_marking()->RecordWrite(
         host(), NULL, cell);
   }
 }


 Address RelocInfo::call_address() {
   ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
          (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
   // The pc_ offset of 0 assumes mips patched return sequence per
   // debug-mips.cc BreakLocationIterator::SetDebugBreakAtReturn(), or
   // debug break slot per BreakLocationIterator::SetDebugBreakAtSlot().
   return Assembler::target_address_at(pc_);
 }


 void RelocInfo::set_call_address(Address target) {
   ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
          (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
   // The pc_ offset of 0 assumes mips patched return sequence per
   // debug-mips.cc BreakLocationIterator::SetDebugBreakAtReturn(), or
   // debug break slot per BreakLocationIterator::SetDebugBreakAtSlot().
   Assembler::set_target_address_at(pc_, target);
   if (host() != NULL) {
     Object* target_code = Code::GetCodeFromTargetAddress(target);
     host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(
         host(), this, HeapObject::cast(target_code));
   }
 }


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


 Object** RelocInfo::call_object_address() {
   ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
          (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
   return reinterpret_cast<Object**>(pc_ + 2 * Assembler::kInstrSize);
 }


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


 bool RelocInfo::IsPatchedReturnSequence() {
   Instr instr0 = Assembler::instr_at(pc_);
   Instr instr1 = Assembler::instr_at(pc_ + 1 * Assembler::kInstrSize);
   Instr instr2 = Assembler::instr_at(pc_ + 2 * Assembler::kInstrSize);
   bool patched_return = ((instr0 & kOpcodeMask) == LUI &&
                          (instr1 & kOpcodeMask) == ORI &&
                          ((instr2 & kOpcodeMask) == JAL ||
                           ((instr2 & kOpcodeMask) == SPECIAL &&
                            (instr2 & kFunctionFieldMask) == JALR)));
   return patched_return;
 }


 bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
   Instr current_instr = Assembler::instr_at(pc_);
   return !Assembler::IsNop(current_instr, Assembler::DEBUG_BREAK_NOP);
 }


 void RelocInfo::Visit(ObjectVisitor* visitor) {
   RelocInfo::Mode mode = rmode();
   if (mode == RelocInfo::EMBEDDED_OBJECT) {
     visitor->VisitEmbeddedPointer(this);
   } else if (RelocInfo::IsCodeTarget(mode)) {
     visitor->VisitCodeTarget(this);
   } else if (mode == RelocInfo::GLOBAL_PROPERTY_CELL) {
     visitor->VisitGlobalPropertyCell(this);
   } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
     visitor->VisitExternalReference(this);
 #ifdef ENABLE_DEBUGGER_SUPPORT
   // TODO(isolates): Get a cached isolate below.
   } else if (((RelocInfo::IsJSReturn(mode) &&
               IsPatchedReturnSequence()) ||
              (RelocInfo::IsDebugBreakSlot(mode) &&
              IsPatchedDebugBreakSlotSequence())) &&
              Isolate::Current()->debug()->has_break_points()) {
     visitor->VisitDebugTarget(this);
 #endif
   } else if (mode == RelocInfo::RUNTIME_ENTRY) {
     visitor->VisitRuntimeEntry(this);
   }
 }


 template<typename StaticVisitor>
 void RelocInfo::Visit(Heap* heap) {
   RelocInfo::Mode mode = rmode();
   if (mode == RelocInfo::EMBEDDED_OBJECT) {
     StaticVisitor::VisitEmbeddedPointer(heap, this);
   } else if (RelocInfo::IsCodeTarget(mode)) {
     StaticVisitor::VisitCodeTarget(heap, this);
   } else if (mode == RelocInfo::GLOBAL_PROPERTY_CELL) {
     StaticVisitor::VisitGlobalPropertyCell(heap, this);
   } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
     StaticVisitor::VisitExternalReference(this);
 #ifdef ENABLE_DEBUGGER_SUPPORT
   } else if (heap->isolate()->debug()->has_break_points() &&
              ((RelocInfo::IsJSReturn(mode) &&
               IsPatchedReturnSequence()) ||
              (RelocInfo::IsDebugBreakSlot(mode) &&
               IsPatchedDebugBreakSlotSequence()))) {
     StaticVisitor::VisitDebugTarget(heap, this);
 #endif
   } else if (mode == RelocInfo::RUNTIME_ENTRY) {
     StaticVisitor::VisitRuntimeEntry(this);
   }
 }


 // -----------------------------------------------------------------------------
 // Assembler.


 void Assembler::CheckBuffer() {
   if (buffer_space() <= kGap) {
     GrowBuffer();
   }
 }


 void Assembler::CheckTrampolinePoolQuick() {
   if (pc_offset() >= next_buffer_check_) {
     CheckTrampolinePool();
   }
 }


 void Assembler::emit(Instr x) {
   if (!is_buffer_growth_blocked()) {
     CheckBuffer();
   }
   *reinterpret_cast<Instr*>(pc_) = x;
   pc_ += kInstrSize;
   CheckTrampolinePoolQuick();
 }


 } }  // namespace v8::internal

 #endif  // V8_MIPS_ASSEMBLER_MIPS_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 2012 the V8 project authors. All rights reserved.


	#ifndef V8_MIPS_ASSEMBLER_MIPS_INL_H_
	#define V8_MIPS_ASSEMBLER_MIPS_INL_H_

	#include "mips/assembler-mips.h"

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


	namespace v8 {
	namespace internal {

	// -----------------------------------------------------------------------------
	// Operand and MemOperand.

	Operand::Operand(int32_t immediate, RelocInfo::Mode rmode) {
	rm_ = no_reg;
	imm32_ = immediate;
	rmode_ = rmode;
	}


	Operand::Operand(const ExternalReference& f) {
	rm_ = no_reg;
	imm32_ = reinterpret_cast<int32_t>(f.address());
	rmode_ = RelocInfo::EXTERNAL_REFERENCE;
	}


	Operand::Operand(Smi* value) {
	rm_ = no_reg;
	imm32_ = reinterpret_cast<intptr_t>(value);
	rmode_ = RelocInfo::NONE;
	}


	Operand::Operand(Register rm) {
	rm_ = rm;
	}


	bool Operand::is_reg() const {
	return rm_.is_valid();
	}


	int FPURegister::ToAllocationIndex(FPURegister reg) {
	ASSERT(reg.code() % 2 == 0);
	ASSERT(reg.code() / 2 < kNumAllocatableRegisters);
	ASSERT(reg.is_valid());
	ASSERT(!reg.is(kDoubleRegZero));
	ASSERT(!reg.is(kLithiumScratchDouble));
	return (reg.code() / 2);
	}


	// -----------------------------------------------------------------------------
	// RelocInfo.

	void RelocInfo::apply(intptr_t delta) {
	if (IsCodeTarget(rmode_)) {
	uint32_t scope1 = (uint32_t) target_address() & ~kImm28Mask;
	uint32_t scope2 = reinterpret_cast<uint32_t>(pc_) & ~kImm28Mask;

	if (scope1 != scope2) {
	Assembler::JumpLabelToJumpRegister(pc_);
	}
	}
	if (IsInternalReference(rmode_)) {
	// Absolute code pointer inside code object moves with the code object.
	byte* p = reinterpret_cast<byte*>(pc_);
	int count = Assembler::RelocateInternalReference(p, delta);
	CPU::FlushICache(p, count * sizeof(uint32_t));
	}
	}


	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 \|\|
	rmode_ == EMBEDDED_OBJECT \|\|
	rmode_ == EXTERNAL_REFERENCE);
	// Read the address of the word containing the target_address in an
	// instruction stream.
	// The only architecture-independent user of this function is the serializer.
	// The serializer uses it to find out how many raw bytes of instruction to
	// output before the next target.
	// For an instruction like LUI/ORI where the target bits are mixed into the
	// instruction bits, the size of the target will be zero, indicating that the
	// serializer should not step forward in memory after a target is resolved
	// and written. In this case the target_address_address function should
	// return the end of the instructions to be patched, allowing the
	// deserializer to deserialize the instructions as raw bytes and put them in
	// place, ready to be patched with the target. After jump optimization,
	// that is the address of the instruction that follows J/JAL/JR/JALR
	// instruction.
	return reinterpret_cast<Address>(
	pc_ + Assembler::kInstructionsFor32BitConstant * Assembler::kInstrSize);
	}


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


	void RelocInfo::set_target_address(Address target, WriteBarrierMode mode) {
	ASSERT(IsCodeTarget(rmode_) \|\| rmode_ == RUNTIME_ENTRY);
	Assembler::set_target_address_at(pc_, target);
	if (mode == UPDATE_WRITE_BARRIER && host() != NULL && IsCodeTarget(rmode_)) {
	Object* target_code = Code::GetCodeFromTargetAddress(target);
	host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(
	host(), this, HeapObject::cast(target_code));
	}
	}


	Object* RelocInfo::target_object() {
	ASSERT(IsCodeTarget(rmode_) \|\| rmode_ == EMBEDDED_OBJECT);
	return reinterpret_cast<Object*>(Assembler::target_address_at(pc_));
	}


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


	Object** RelocInfo::target_object_address() {
	// Provide a "natural pointer" to the embedded object,
	// which can be de-referenced during heap iteration.
	ASSERT(IsCodeTarget(rmode_) \|\| rmode_ == EMBEDDED_OBJECT);
	reconstructed_obj_ptr_ =
	reinterpret_cast<Object*>(Assembler::target_address_at(pc_));
	return &reconstructed_obj_ptr_;
	}


	void RelocInfo::set_target_object(Object* target, WriteBarrierMode mode) {
	ASSERT(IsCodeTarget(rmode_) \|\| rmode_ == EMBEDDED_OBJECT);
	Assembler::set_target_address_at(pc_, reinterpret_cast<Address>(target));
	if (mode == UPDATE_WRITE_BARRIER &&
	host() != NULL &&
	target->IsHeapObject()) {
	host()->GetHeap()->incremental_marking()->RecordWrite(
	host(), &Memory::Object_at(pc_), HeapObject::cast(target));
	}
	}


	Address* RelocInfo::target_reference_address() {
	ASSERT(rmode_ == EXTERNAL_REFERENCE);
	reconstructed_adr_ptr_ = Assembler::target_address_at(pc_);
	return &reconstructed_adr_ptr_;
	}


	Handle<JSGlobalPropertyCell> RelocInfo::target_cell_handle() {
	ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL);
	Address address = Memory::Address_at(pc_);
	return Handle<JSGlobalPropertyCell>(
	reinterpret_cast<JSGlobalPropertyCell**>(address));
	}


	JSGlobalPropertyCell* RelocInfo::target_cell() {
	ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL);
	Address address = Memory::Address_at(pc_);
	Object* object = HeapObject::FromAddress(
	address - JSGlobalPropertyCell::kValueOffset);
	return reinterpret_cast<JSGlobalPropertyCell*>(object);
	}


	void RelocInfo::set_target_cell(JSGlobalPropertyCell* cell,
	WriteBarrierMode mode) {
	ASSERT(rmode_ == RelocInfo::GLOBAL_PROPERTY_CELL);
	Address address = cell->address() + JSGlobalPropertyCell::kValueOffset;
	Memory::Address_at(pc_) = address;
	if (mode == UPDATE_WRITE_BARRIER && host() != NULL) {
	// TODO(1550) We are passing NULL as a slot because cell can never be on
	// evacuation candidate.
	host()->GetHeap()->incremental_marking()->RecordWrite(
	host(), NULL, cell);
	}
	}


	Address RelocInfo::call_address() {
	ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) \|\|
	(IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
	// The pc_ offset of 0 assumes mips patched return sequence per
	// debug-mips.cc BreakLocationIterator::SetDebugBreakAtReturn(), or
	// debug break slot per BreakLocationIterator::SetDebugBreakAtSlot().
	return Assembler::target_address_at(pc_);
	}


	void RelocInfo::set_call_address(Address target) {
	ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) \|\|
	(IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
	// The pc_ offset of 0 assumes mips patched return sequence per
	// debug-mips.cc BreakLocationIterator::SetDebugBreakAtReturn(), or
	// debug break slot per BreakLocationIterator::SetDebugBreakAtSlot().
	Assembler::set_target_address_at(pc_, target);
	if (host() != NULL) {
	Object* target_code = Code::GetCodeFromTargetAddress(target);
	host()->GetHeap()->incremental_marking()->RecordWriteIntoCode(
	host(), this, HeapObject::cast(target_code));
	}
	}


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


	Object** RelocInfo::call_object_address() {
	ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) \|\|
	(IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
	return reinterpret_cast<Object*>(pc_ + 2 Assembler::kInstrSize);
	}


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


	bool RelocInfo::IsPatchedReturnSequence() {
	Instr instr0 = Assembler::instr_at(pc_);
	Instr instr1 = Assembler::instr_at(pc_ + 1 * Assembler::kInstrSize);
	Instr instr2 = Assembler::instr_at(pc_ + 2 * Assembler::kInstrSize);
	bool patched_return = ((instr0 & kOpcodeMask) == LUI &&
	(instr1 & kOpcodeMask) == ORI &&
	((instr2 & kOpcodeMask) == JAL \|\|
	((instr2 & kOpcodeMask) == SPECIAL &&
	(instr2 & kFunctionFieldMask) == JALR)));
	return patched_return;
	}


	bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
	Instr current_instr = Assembler::instr_at(pc_);
	return !Assembler::IsNop(current_instr, Assembler::DEBUG_BREAK_NOP);
	}


	void RelocInfo::Visit(ObjectVisitor* visitor) {
	RelocInfo::Mode mode = rmode();
	if (mode == RelocInfo::EMBEDDED_OBJECT) {
	visitor->VisitEmbeddedPointer(this);
	} else if (RelocInfo::IsCodeTarget(mode)) {
	visitor->VisitCodeTarget(this);
	} else if (mode == RelocInfo::GLOBAL_PROPERTY_CELL) {
	visitor->VisitGlobalPropertyCell(this);
	} else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
	visitor->VisitExternalReference(this);
	#ifdef ENABLE_DEBUGGER_SUPPORT
	// TODO(isolates): Get a cached isolate below.
	} else if (((RelocInfo::IsJSReturn(mode) &&
	IsPatchedReturnSequence()) \|\|
	(RelocInfo::IsDebugBreakSlot(mode) &&
	IsPatchedDebugBreakSlotSequence())) &&
	Isolate::Current()->debug()->has_break_points()) {
	visitor->VisitDebugTarget(this);
	#endif
	} else if (mode == RelocInfo::RUNTIME_ENTRY) {
	visitor->VisitRuntimeEntry(this);
	}
	}


	template<typename StaticVisitor>
	void RelocInfo::Visit(Heap* heap) {
	RelocInfo::Mode mode = rmode();
	if (mode == RelocInfo::EMBEDDED_OBJECT) {
	StaticVisitor::VisitEmbeddedPointer(heap, this);
	} else if (RelocInfo::IsCodeTarget(mode)) {
	StaticVisitor::VisitCodeTarget(heap, this);
	} else if (mode == RelocInfo::GLOBAL_PROPERTY_CELL) {
	StaticVisitor::VisitGlobalPropertyCell(heap, this);
	} else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
	StaticVisitor::VisitExternalReference(this);
	#ifdef ENABLE_DEBUGGER_SUPPORT
	} else if (heap->isolate()->debug()->has_break_points() &&
	((RelocInfo::IsJSReturn(mode) &&
	IsPatchedReturnSequence()) \|\|
	(RelocInfo::IsDebugBreakSlot(mode) &&
	IsPatchedDebugBreakSlotSequence()))) {
	StaticVisitor::VisitDebugTarget(heap, this);
	#endif
	} else if (mode == RelocInfo::RUNTIME_ENTRY) {
	StaticVisitor::VisitRuntimeEntry(this);
	}
	}


	// -----------------------------------------------------------------------------
	// Assembler.


	void Assembler::CheckBuffer() {
	if (buffer_space() <= kGap) {
	GrowBuffer();
	}
	}


	void Assembler::CheckTrampolinePoolQuick() {
	if (pc_offset() >= next_buffer_check_) {
	CheckTrampolinePool();
	}
	}


	void Assembler::emit(Instr x) {
	if (!is_buffer_growth_blocked()) {
	CheckBuffer();
	}
	reinterpret_cast<Instr>(pc_) = x;
	pc_ += kInstrSize;
	CheckTrampolinePoolQuick();
	}


	} } // namespace v8::internal

	#endif // V8_MIPS_ASSEMBLER_MIPS_INL_H_