runtime/vm/instructions_mips.cc - sdk - Git at Google

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.

 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_MIPS.
 #if defined(TARGET_ARCH_MIPS)

 #include "vm/instructions.h"
 #include "vm/instructions_mips.h"

 #include "vm/constants_mips.h"
 #include "vm/cpu.h"
 #include "vm/object.h"

 namespace dart {

 CallPattern::CallPattern(uword pc, const Code& code)
     : object_pool_(ObjectPool::Handle(code.GetObjectPool())),
       end_(pc),
       ic_data_load_end_(0),
       target_code_pool_index_(-1),
       ic_data_(ICData::Handle()) {
   ASSERT(code.ContainsInstructionAt(pc));
   // Last instruction: jalr RA, T9(=R25).
   ASSERT(*(reinterpret_cast<uword*>(end_) - 2) == 0x0320f809);
   Register reg;
   // The end of the pattern is the instruction after the delay slot of the jalr.
   ic_data_load_end_ = InstructionPattern::DecodeLoadWordFromPool(
       end_ - (3 * Instr::kInstrSize), &reg, &target_code_pool_index_);
   ASSERT(reg == CODE_REG);
 }


 // Decodes a load sequence ending at 'end' (the last instruction of the load
 // sequence is the instruction before the one at end).  Returns a pointer to
 // the first instruction in the sequence.  Returns the register being loaded
 // and the loaded object in the output parameters 'reg' and 'obj'
 // respectively.
 uword InstructionPattern::DecodeLoadObject(uword end,
                                            const ObjectPool& object_pool,
                                            Register* reg,
                                            Object* obj) {
   uword start = 0;
   Instr* instr = Instr::At(end - Instr::kInstrSize);
   if (instr->OpcodeField() == LW) {
     intptr_t index = 0;
     start = DecodeLoadWordFromPool(end, reg, &index);
     *obj = object_pool.ObjectAt(index);
   } else {
     intptr_t value = 0;
     start = DecodeLoadWordImmediate(end, reg, &value);
     *obj = reinterpret_cast<RawObject*>(value);
   }
   return start;
 }


 // Decodes a load sequence ending at 'end' (the last instruction of the load
 // sequence is the instruction before the one at end).  Returns a pointer to
 // the first instruction in the sequence.  Returns the register being loaded
 // and the loaded immediate value in the output parameters 'reg' and 'value'
 // respectively.
 uword InstructionPattern::DecodeLoadWordImmediate(uword end,
                                                   Register* reg,
                                                   intptr_t* value) {
   // The pattern is a fixed size, but match backwards for uniformity with
   // DecodeLoadWordFromPool.
   uword start = end - Instr::kInstrSize;
   Instr* instr = Instr::At(start);
   intptr_t imm = 0;
   ASSERT(instr->OpcodeField() == ORI);
   imm = instr->UImmField();
   *reg = instr->RtField();

   start -= Instr::kInstrSize;
   instr = Instr::At(start);
   ASSERT(instr->OpcodeField() == LUI);
   ASSERT(instr->RtField() == *reg);
   imm |= (instr->UImmField() << 16);
   *value = imm;
   return start;
 }


 // Decodes a load sequence ending at 'end' (the last instruction of the load
 // sequence is the instruction before the one at end).  Returns a pointer to
 // the first instruction in the sequence.  Returns the register being loaded
 // and the index in the pool being read from in the output parameters 'reg'
 // and 'index' respectively.
 uword InstructionPattern::DecodeLoadWordFromPool(uword end,
                                                  Register* reg,
                                                  intptr_t* index) {
   uword start = end - Instr::kInstrSize;
   Instr* instr = Instr::At(start);
   intptr_t offset = 0;
   if ((instr->OpcodeField() == LW) && (instr->RsField() == PP)) {
     offset = instr->SImmField();
     *reg = instr->RtField();
   } else {
     ASSERT(instr->OpcodeField() == LW);
     offset = instr->SImmField();
     *reg = instr->RtField();

     start -= Instr::kInstrSize;
     instr = Instr::At(start);
     ASSERT(instr->OpcodeField() == SPECIAL);
     ASSERT(instr->FunctionField() == ADDU);
     ASSERT(instr->RdField() == *reg);
     ASSERT(instr->RsField() == *reg);
     ASSERT(instr->RtField() == PP);

     start -= Instr::kInstrSize;
     instr = Instr::At(start);
     ASSERT(instr->OpcodeField() == LUI);
     ASSERT(instr->RtField() == *reg);
     // Offset is signed, so add the upper 16 bits.
     offset += (instr->UImmField() << 16);
   }
   *index = ObjectPool::IndexFromOffset(offset);
   return start;
 }


 bool DecodeLoadObjectFromPoolOrThread(uword pc, const Code& code, Object* obj) {
   ASSERT(code.ContainsInstructionAt(pc));

   Instr* instr = Instr::At(pc);
   if ((instr->OpcodeField() == LW)) {
     intptr_t offset = instr->SImmField();
     if (instr->RsField() == PP) {
       intptr_t index = ObjectPool::IndexFromOffset(offset);
       const ObjectPool& pool = ObjectPool::Handle(code.object_pool());
       if (pool.InfoAt(index) == ObjectPool::kTaggedObject) {
         *obj = pool.ObjectAt(index);
         return true;
       }
     } else if (instr->RsField() == THR) {
       return Thread::ObjectAtOffset(offset, obj);
     }
   }
   // TODO(rmacnak): Sequence for loads beyond 16 bits.

   return false;
 }


 RawICData* CallPattern::IcData() {
   if (ic_data_.IsNull()) {
     Register reg;
     InstructionPattern::DecodeLoadObject(ic_data_load_end_, object_pool_, &reg,
                                          &ic_data_);
     ASSERT(reg == S5);
   }
   return ic_data_.raw();
 }


 RawCode* CallPattern::TargetCode() const {
   return reinterpret_cast<RawCode*>(
       object_pool_.ObjectAt(target_code_pool_index_));
 }


 void CallPattern::SetTargetCode(const Code& target) const {
   object_pool_.SetObjectAt(target_code_pool_index_, target);
   // No need to flush the instruction cache, since the code is not modified.
 }


 NativeCallPattern::NativeCallPattern(uword pc, const Code& code)
     : object_pool_(ObjectPool::Handle(code.GetObjectPool())),
       end_(pc),
       native_function_pool_index_(-1),
       target_code_pool_index_(-1) {
   ASSERT(code.ContainsInstructionAt(pc));
   // Last instruction: jalr RA, T9(=R25).
   ASSERT(*(reinterpret_cast<uword*>(end_) - 2) == 0x0320f809);

   Register reg;
   uword native_function_load_end = InstructionPattern::DecodeLoadWordFromPool(
       end_ - 3 * Instr::kInstrSize, &reg, &target_code_pool_index_);
   ASSERT(reg == CODE_REG);
   InstructionPattern::DecodeLoadWordFromPool(native_function_load_end, &reg,
                                              &native_function_pool_index_);
   ASSERT(reg == T5);
 }


 RawCode* NativeCallPattern::target() const {
   return reinterpret_cast<RawCode*>(
       object_pool_.ObjectAt(target_code_pool_index_));
 }


 void NativeCallPattern::set_target(const Code& target) const {
   object_pool_.SetObjectAt(target_code_pool_index_, target);
   // No need to flush the instruction cache, since the code is not modified.
 }


 NativeFunction NativeCallPattern::native_function() const {
   return reinterpret_cast<NativeFunction>(
       object_pool_.RawValueAt(native_function_pool_index_));
 }


 void NativeCallPattern::set_native_function(NativeFunction func) const {
   object_pool_.SetRawValueAt(native_function_pool_index_,
                              reinterpret_cast<uword>(func));
 }


 SwitchableCallPattern::SwitchableCallPattern(uword pc, const Code& code)
     : object_pool_(ObjectPool::Handle(code.GetObjectPool())),
       data_pool_index_(-1),
       target_pool_index_(-1) {
   ASSERT(code.ContainsInstructionAt(pc));
   // Last instruction: jalr t9.
   ASSERT(*(reinterpret_cast<uword*>(pc) - 1) == 0);  // Delay slot.
   ASSERT(*(reinterpret_cast<uword*>(pc) - 2) == 0x0320f809);

   Register reg;
   uword data_load_end = InstructionPattern::DecodeLoadWordFromPool(
       pc - 2 * Instr::kInstrSize, &reg, &data_pool_index_);
   ASSERT(reg == S5);
   InstructionPattern::DecodeLoadWordFromPool(data_load_end - Instr::kInstrSize,
                                              &reg, &target_pool_index_);
   ASSERT(reg == CODE_REG);
 }


 RawObject* SwitchableCallPattern::data() const {
   return object_pool_.ObjectAt(data_pool_index_);
 }


 RawCode* SwitchableCallPattern::target() const {
   return reinterpret_cast<RawCode*>(object_pool_.ObjectAt(target_pool_index_));
 }


 void SwitchableCallPattern::SetData(const Object& data) const {
   ASSERT(!Object::Handle(object_pool_.ObjectAt(data_pool_index_)).IsCode());
   object_pool_.SetObjectAt(data_pool_index_, data);
 }


 void SwitchableCallPattern::SetTarget(const Code& target) const {
   ASSERT(Object::Handle(object_pool_.ObjectAt(target_pool_index_)).IsCode());
   object_pool_.SetObjectAt(target_pool_index_, target);
 }


 ReturnPattern::ReturnPattern(uword pc) : pc_(pc) {}


 bool ReturnPattern::IsValid() const {
   Instr* jr = Instr::At(pc_);
   return (jr->OpcodeField() == SPECIAL) && (jr->FunctionField() == JR) &&
          (jr->RsField() == RA);
 }

 }  // namespace dart

 #endif  // defined TARGET_ARCH_MIPS
	// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
	// for details. All rights reserved. Use of this source code is governed by a
	// BSD-style license that can be found in the LICENSE file.

	#include "vm/globals.h" // Needed here to get TARGET_ARCH_MIPS.
	#if defined(TARGET_ARCH_MIPS)

	#include "vm/instructions.h"
	#include "vm/instructions_mips.h"

	#include "vm/constants_mips.h"
	#include "vm/cpu.h"
	#include "vm/object.h"

	namespace dart {

	CallPattern::CallPattern(uword pc, const Code& code)
	: object_pool_(ObjectPool::Handle(code.GetObjectPool())),
	end_(pc),
	ic_data_load_end_(0),
	target_code_pool_index_(-1),
	ic_data_(ICData::Handle()) {
	ASSERT(code.ContainsInstructionAt(pc));
	// Last instruction: jalr RA, T9(=R25).
	ASSERT((reinterpret_cast<uword>(end_) - 2) == 0x0320f809);
	Register reg;
	// The end of the pattern is the instruction after the delay slot of the jalr.
	ic_data_load_end_ = InstructionPattern::DecodeLoadWordFromPool(
	end_ - (3 * Instr::kInstrSize), &reg, &target_code_pool_index_);
	ASSERT(reg == CODE_REG);
	}


	// Decodes a load sequence ending at 'end' (the last instruction of the load
	// sequence is the instruction before the one at end). Returns a pointer to
	// the first instruction in the sequence. Returns the register being loaded
	// and the loaded object in the output parameters 'reg' and 'obj'
	// respectively.
	uword InstructionPattern::DecodeLoadObject(uword end,
	const ObjectPool& object_pool,
	Register* reg,
	Object* obj) {
	uword start = 0;
	Instr* instr = Instr::At(end - Instr::kInstrSize);
	if (instr->OpcodeField() == LW) {
	intptr_t index = 0;
	start = DecodeLoadWordFromPool(end, reg, &index);
	*obj = object_pool.ObjectAt(index);
	} else {
	intptr_t value = 0;
	start = DecodeLoadWordImmediate(end, reg, &value);
	obj = reinterpret_cast<RawObject>(value);
	}
	return start;
	}


	// Decodes a load sequence ending at 'end' (the last instruction of the load
	// sequence is the instruction before the one at end). Returns a pointer to
	// the first instruction in the sequence. Returns the register being loaded
	// and the loaded immediate value in the output parameters 'reg' and 'value'
	// respectively.
	uword InstructionPattern::DecodeLoadWordImmediate(uword end,
	Register* reg,
	intptr_t* value) {
	// The pattern is a fixed size, but match backwards for uniformity with
	// DecodeLoadWordFromPool.
	uword start = end - Instr::kInstrSize;
	Instr* instr = Instr::At(start);
	intptr_t imm = 0;
	ASSERT(instr->OpcodeField() == ORI);
	imm = instr->UImmField();
	*reg = instr->RtField();

	start -= Instr::kInstrSize;
	instr = Instr::At(start);
	ASSERT(instr->OpcodeField() == LUI);
	ASSERT(instr->RtField() == *reg);
	imm \|= (instr->UImmField() << 16);
	*value = imm;
	return start;
	}


	// Decodes a load sequence ending at 'end' (the last instruction of the load
	// sequence is the instruction before the one at end). Returns a pointer to
	// the first instruction in the sequence. Returns the register being loaded
	// and the index in the pool being read from in the output parameters 'reg'
	// and 'index' respectively.
	uword InstructionPattern::DecodeLoadWordFromPool(uword end,
	Register* reg,
	intptr_t* index) {
	uword start = end - Instr::kInstrSize;
	Instr* instr = Instr::At(start);
	intptr_t offset = 0;
	if ((instr->OpcodeField() == LW) && (instr->RsField() == PP)) {
	offset = instr->SImmField();
	*reg = instr->RtField();
	} else {
	ASSERT(instr->OpcodeField() == LW);
	offset = instr->SImmField();
	*reg = instr->RtField();

	start -= Instr::kInstrSize;
	instr = Instr::At(start);
	ASSERT(instr->OpcodeField() == SPECIAL);
	ASSERT(instr->FunctionField() == ADDU);
	ASSERT(instr->RdField() == *reg);
	ASSERT(instr->RsField() == *reg);
	ASSERT(instr->RtField() == PP);

	start -= Instr::kInstrSize;
	instr = Instr::At(start);
	ASSERT(instr->OpcodeField() == LUI);
	ASSERT(instr->RtField() == *reg);
	// Offset is signed, so add the upper 16 bits.
	offset += (instr->UImmField() << 16);
	}
	*index = ObjectPool::IndexFromOffset(offset);
	return start;
	}


	bool DecodeLoadObjectFromPoolOrThread(uword pc, const Code& code, Object* obj) {
	ASSERT(code.ContainsInstructionAt(pc));

	Instr* instr = Instr::At(pc);
	if ((instr->OpcodeField() == LW)) {
	intptr_t offset = instr->SImmField();
	if (instr->RsField() == PP) {
	intptr_t index = ObjectPool::IndexFromOffset(offset);
	const ObjectPool& pool = ObjectPool::Handle(code.object_pool());
	if (pool.InfoAt(index) == ObjectPool::kTaggedObject) {
	*obj = pool.ObjectAt(index);
	return true;
	}
	} else if (instr->RsField() == THR) {
	return Thread::ObjectAtOffset(offset, obj);
	}
	}
	// TODO(rmacnak): Sequence for loads beyond 16 bits.

	return false;
	}


	RawICData* CallPattern::IcData() {
	if (ic_data_.IsNull()) {
	Register reg;
	InstructionPattern::DecodeLoadObject(ic_data_load_end_, object_pool_, &reg,
	&ic_data_);
	ASSERT(reg == S5);
	}
	return ic_data_.raw();
	}


	RawCode* CallPattern::TargetCode() const {
	return reinterpret_cast<RawCode*>(
	object_pool_.ObjectAt(target_code_pool_index_));
	}


	void CallPattern::SetTargetCode(const Code& target) const {
	object_pool_.SetObjectAt(target_code_pool_index_, target);
	// No need to flush the instruction cache, since the code is not modified.
	}


	NativeCallPattern::NativeCallPattern(uword pc, const Code& code)
	: object_pool_(ObjectPool::Handle(code.GetObjectPool())),
	end_(pc),
	native_function_pool_index_(-1),
	target_code_pool_index_(-1) {
	ASSERT(code.ContainsInstructionAt(pc));
	// Last instruction: jalr RA, T9(=R25).
	ASSERT((reinterpret_cast<uword>(end_) - 2) == 0x0320f809);

	Register reg;
	uword native_function_load_end = InstructionPattern::DecodeLoadWordFromPool(
	end_ - 3 * Instr::kInstrSize, &reg, &target_code_pool_index_);
	ASSERT(reg == CODE_REG);
	InstructionPattern::DecodeLoadWordFromPool(native_function_load_end, &reg,
	&native_function_pool_index_);
	ASSERT(reg == T5);
	}


	RawCode* NativeCallPattern::target() const {
	return reinterpret_cast<RawCode*>(
	object_pool_.ObjectAt(target_code_pool_index_));
	}


	void NativeCallPattern::set_target(const Code& target) const {
	object_pool_.SetObjectAt(target_code_pool_index_, target);
	// No need to flush the instruction cache, since the code is not modified.
	}


	NativeFunction NativeCallPattern::native_function() const {
	return reinterpret_cast<NativeFunction>(
	object_pool_.RawValueAt(native_function_pool_index_));
	}


	void NativeCallPattern::set_native_function(NativeFunction func) const {
	object_pool_.SetRawValueAt(native_function_pool_index_,
	reinterpret_cast<uword>(func));
	}


	SwitchableCallPattern::SwitchableCallPattern(uword pc, const Code& code)
	: object_pool_(ObjectPool::Handle(code.GetObjectPool())),
	data_pool_index_(-1),
	target_pool_index_(-1) {
	ASSERT(code.ContainsInstructionAt(pc));
	// Last instruction: jalr t9.
	ASSERT((reinterpret_cast<uword>(pc) - 1) == 0); // Delay slot.
	ASSERT((reinterpret_cast<uword>(pc) - 2) == 0x0320f809);

	Register reg;
	uword data_load_end = InstructionPattern::DecodeLoadWordFromPool(
	pc - 2 * Instr::kInstrSize, &reg, &data_pool_index_);
	ASSERT(reg == S5);
	InstructionPattern::DecodeLoadWordFromPool(data_load_end - Instr::kInstrSize,
	&reg, &target_pool_index_);
	ASSERT(reg == CODE_REG);
	}


	RawObject* SwitchableCallPattern::data() const {
	return object_pool_.ObjectAt(data_pool_index_);
	}


	RawCode* SwitchableCallPattern::target() const {
	return reinterpret_cast<RawCode*>(object_pool_.ObjectAt(target_pool_index_));
	}


	void SwitchableCallPattern::SetData(const Object& data) const {
	ASSERT(!Object::Handle(object_pool_.ObjectAt(data_pool_index_)).IsCode());
	object_pool_.SetObjectAt(data_pool_index_, data);
	}


	void SwitchableCallPattern::SetTarget(const Code& target) const {
	ASSERT(Object::Handle(object_pool_.ObjectAt(target_pool_index_)).IsCode());
	object_pool_.SetObjectAt(target_pool_index_, target);
	}


	ReturnPattern::ReturnPattern(uword pc) : pc_(pc) {}


	bool ReturnPattern::IsValid() const {
	Instr* jr = Instr::At(pc_);
	return (jr->OpcodeField() == SPECIAL) && (jr->FunctionField() == JR) &&
	(jr->RsField() == RA);
	}

	} // namespace dart

	#endif // defined TARGET_ARCH_MIPS