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// Copyright 2017 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_SNAPSHOT_BUILTIN_SNAPSHOT_UTILS_H_
#define V8_SNAPSHOT_BUILTIN_SNAPSHOT_UTILS_H_
#include <functional>
#include "src/interpreter/interpreter.h"
namespace v8 {
namespace internal {
// Constants and utility methods used by builtin and bytecode handler
// (de)serialization.
class BuiltinSnapshotUtils : public AllStatic {
using Bytecode = interpreter::Bytecode;
using BytecodeOperands = interpreter::BytecodeOperands;
using Bytecodes = interpreter::Bytecodes;
using Interpreter = interpreter::Interpreter;
using OperandScale = interpreter::OperandScale;
public:
static const int kFirstBuiltinIndex = 0;
static const int kNumberOfBuiltins = Builtins::builtin_count;
static const int kFirstHandlerIndex = kFirstBuiltinIndex + kNumberOfBuiltins;
static const int kNumberOfHandlers =
Bytecodes::kBytecodeCount * BytecodeOperands::kOperandScaleCount;
// The number of code objects in the builtin snapshot.
// TODO(jgruber): This could be reduced by a bit since not every
// {bytecode, operand_scale} combination has an associated handler
// (see Bytecodes::BytecodeHasHandler).
static const int kNumberOfCodeObjects = kNumberOfBuiltins + kNumberOfHandlers;
// Indexes into the offsets vector contained in snapshot.
// See e.g. BuiltinSerializer::code_offsets_.
static bool IsBuiltinIndex(int maybe_index);
static bool IsHandlerIndex(int maybe_index);
static int BytecodeToIndex(Bytecode bytecode, OperandScale operand_scale);
// Converts an index back into the {bytecode,operand_scale} tuple. This is the
// inverse operation of BytecodeToIndex().
static std::pair<Bytecode, OperandScale> BytecodeFromIndex(int index);
// Iteration over all {bytecode,operand_scale} pairs. Implemented here since
// (de)serialization depends on the iteration order.
static void ForEachBytecode(std::function<void(Bytecode, OperandScale)> f);
};
} // namespace internal
} // namespace v8
#endif // V8_SNAPSHOT_BUILTIN_SNAPSHOT_UTILS_H_
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