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// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/interpreter/bytecode-register.h"
namespace v8 {
namespace internal {
namespace interpreter {
static const int kLastParamRegisterIndex =
(InterpreterFrameConstants::kRegisterFileFromFp -
InterpreterFrameConstants::kLastParamFromFp) /
kPointerSize;
static const int kFunctionClosureRegisterIndex =
(InterpreterFrameConstants::kRegisterFileFromFp -
StandardFrameConstants::kFunctionOffset) /
kPointerSize;
static const int kCurrentContextRegisterIndex =
(InterpreterFrameConstants::kRegisterFileFromFp -
StandardFrameConstants::kContextOffset) /
kPointerSize;
static const int kBytecodeArrayRegisterIndex =
(InterpreterFrameConstants::kRegisterFileFromFp -
InterpreterFrameConstants::kBytecodeArrayFromFp) /
kPointerSize;
static const int kBytecodeOffsetRegisterIndex =
(InterpreterFrameConstants::kRegisterFileFromFp -
InterpreterFrameConstants::kBytecodeOffsetFromFp) /
kPointerSize;
static const int kCallerPCOffsetRegisterIndex =
(InterpreterFrameConstants::kRegisterFileFromFp -
InterpreterFrameConstants::kCallerPCOffsetFromFp) /
kPointerSize;
Register Register::FromParameterIndex(int index, int parameter_count) {
DCHECK_GE(index, 0);
DCHECK_LT(index, parameter_count);
int register_index = kLastParamRegisterIndex - parameter_count + index + 1;
DCHECK_LT(register_index, 0);
return Register(register_index);
}
int Register::ToParameterIndex(int parameter_count) const {
DCHECK(is_parameter());
return index() - kLastParamRegisterIndex + parameter_count - 1;
}
Register Register::function_closure() {
return Register(kFunctionClosureRegisterIndex);
}
bool Register::is_function_closure() const {
return index() == kFunctionClosureRegisterIndex;
}
Register Register::current_context() {
return Register(kCurrentContextRegisterIndex);
}
bool Register::is_current_context() const {
return index() == kCurrentContextRegisterIndex;
}
Register Register::bytecode_array() {
return Register(kBytecodeArrayRegisterIndex);
}
bool Register::is_bytecode_array() const {
return index() == kBytecodeArrayRegisterIndex;
}
Register Register::bytecode_offset() {
return Register(kBytecodeOffsetRegisterIndex);
}
bool Register::is_bytecode_offset() const {
return index() == kBytecodeOffsetRegisterIndex;
}
// static
Register Register::virtual_accumulator() {
return Register(kCallerPCOffsetRegisterIndex);
}
OperandSize Register::SizeOfOperand() const {
int32_t operand = ToOperand();
if (operand >= kMinInt8 && operand <= kMaxInt8) {
return OperandSize::kByte;
} else if (operand >= kMinInt16 && operand <= kMaxInt16) {
return OperandSize::kShort;
} else {
return OperandSize::kQuad;
}
}
bool Register::AreContiguous(Register reg1, Register reg2, Register reg3,
Register reg4, Register reg5) {
if (reg1.index() + 1 != reg2.index()) {
return false;
}
if (reg3.is_valid() && reg2.index() + 1 != reg3.index()) {
return false;
}
if (reg4.is_valid() && reg3.index() + 1 != reg4.index()) {
return false;
}
if (reg5.is_valid() && reg4.index() + 1 != reg5.index()) {
return false;
}
return true;
}
std::string Register::ToString(int parameter_count) const {
if (is_current_context()) {
return std::string("<context>");
} else if (is_function_closure()) {
return std::string("<closure>");
} else if (is_parameter()) {
int parameter_index = ToParameterIndex(parameter_count);
if (parameter_index == 0) {
return std::string("<this>");
} else {
std::ostringstream s;
s << "a" << parameter_index - 1;
return s.str();
}
} else {
std::ostringstream s;
s << "r" << index();
return s.str();
}
}
} // namespace interpreter
} // namespace internal
} // namespace v8
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