v8/test/unittests/interpreter/bytecode-utils.h

// 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_UNITTESTS_INTERPRETER_BYTECODE_UTILS_H_
#define V8_UNITTESTS_INTERPRETER_BYTECODE_UTILS_H_

#include "src/frames.h"
#include "src/interpreter/bytecode-register.h"

namespace v8 {
namespace internal {
namespace interpreter {

#if V8_TARGET_LITTLE_ENDIAN

#define EXTRACT(x, n) static_cast<uint8_t>((x) >> (8 * n))
#define U16(i) EXTRACT(i, 0), EXTRACT(i, 1)
#define U32(i) EXTRACT(i, 0), EXTRACT(i, 1), EXTRACT(i, 2), EXTRACT(i, 3)

#elif V8_TARGET_BIG_ENDIAN

#define EXTRACT(x, n) static_cast<uint8_t>((x) >> (8 * n))

#define U16(i) EXTRACT(i, 1), EXTRACT(i, 0)
#define U32(i) EXTRACT(i, 3), EXTRACT(i, 2), EXTRACT(i, 1), EXTRACT(i, 0)

#else

#error "Unknown Architecture"

#endif

#define U8(i) static_cast<uint8_t>(i)
#define REG_OPERAND(i) \
  (InterpreterFrameConstants::kRegisterFileFromFp / kPointerSize - (i))
#define R8(i) static_cast<uint8_t>(REG_OPERAND(i))
#define R16(i) U16(REG_OPERAND(i))
#define R32(i) U32(REG_OPERAND(i))

class BytecodeUtils {
 public:
  // Expose raw RegisterList construction to tests.
  static RegisterList NewRegisterList(int first_reg_index, int register_count) {
    return RegisterList(first_reg_index, register_count);
  }

 private:
  DISALLOW_IMPLICIT_CONSTRUCTORS(BytecodeUtils);
};

}  // namespace interpreter
}  // namespace internal
}  // namespace v8

#endif  // V8_UNITTESTS_INTERPRETER_BYTECODE_UTILS_H_