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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.
#ifndef V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_
#define V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_
#include <vector>
#include "src/ast.h"
#include "src/interpreter/bytecodes.h"
namespace v8 {
namespace internal {
class Isolate;
namespace interpreter {
class Register;
class BytecodeArrayBuilder {
public:
explicit BytecodeArrayBuilder(Isolate* isolate);
Handle<BytecodeArray> ToBytecodeArray();
// Set number of locals required for bytecode array.
void set_locals_count(int number_of_locals);
int locals_count() const;
// Constant loads to accumulator.
BytecodeArrayBuilder& LoadLiteral(v8::internal::Smi* value);
BytecodeArrayBuilder& LoadUndefined();
BytecodeArrayBuilder& LoadNull();
BytecodeArrayBuilder& LoadTheHole();
BytecodeArrayBuilder& LoadTrue();
BytecodeArrayBuilder& LoadFalse();
// Register-accumulator transfers.
BytecodeArrayBuilder& LoadAccumulatorWithRegister(Register reg);
BytecodeArrayBuilder& StoreAccumulatorInRegister(Register reg);
// Operators.
BytecodeArrayBuilder& BinaryOperation(Token::Value binop, Register reg);
// Flow Control.
BytecodeArrayBuilder& Return();
private:
static Bytecode BytecodeForBinaryOperation(Token::Value op);
void Output(Bytecode bytecode, uint8_t r0, uint8_t r1, uint8_t r2);
void Output(Bytecode bytecode, uint8_t r0, uint8_t r1);
void Output(Bytecode bytecode, uint8_t r0);
void Output(Bytecode bytecode);
bool OperandIsValid(Bytecode bytecode, int operand_index,
uint8_t operand_value) const;
int BorrowTemporaryRegister();
void ReturnTemporaryRegister(int reg_index);
Isolate* isolate_;
std::vector<uint8_t> bytecodes_;
bool bytecode_generated_;
int local_register_count_;
int temporary_register_count_;
int temporary_register_next_;
friend class TemporaryRegisterScope;
DISALLOW_IMPLICIT_CONSTRUCTORS(BytecodeArrayBuilder);
};
// An interpreter register which is located in the function's regsiter file
// in its stack-frame.
class Register {
public:
static const int kMaxRegisterIndex = 128;
explicit Register(int index) : index_(index) {
DCHECK_LE(index_, kMaxRegisterIndex);
}
int index() { return index_; }
uint8_t ToOperand() { return static_cast<uint8_t>(-index_); }
static Register FromOperand(uint8_t operand) {
return Register(-static_cast<int8_t>(operand));
}
private:
void* operator new(size_t size);
void operator delete(void* p);
int index_;
};
// A stack-allocated class than allows the instantiator to allocate
// temporary registers that are cleaned up when scope is closed.
class TemporaryRegisterScope {
public:
explicit TemporaryRegisterScope(BytecodeArrayBuilder* builder);
~TemporaryRegisterScope();
Register NewRegister();
private:
void* operator new(size_t size);
void operator delete(void* p);
BytecodeArrayBuilder* builder_;
int count_;
int last_register_index_;
DISALLOW_COPY_AND_ASSIGN(TemporaryRegisterScope);
};
} // namespace interpreter
} // namespace internal
} // namespace v8
#endif // V8_INTERPRETER_BYTECODE_ARRAY_BUILDER_H_
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