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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#ifndef vm_BytecodeIterator_h
#define vm_BytecodeIterator_h
#include "vm/BytecodeLocation.h"
namespace js {
class BytecodeIterator {
BytecodeLocation current_;
inline explicit BytecodeIterator(const JSScript* script);
explicit BytecodeIterator(BytecodeLocation loc) : current_(loc) {}
BytecodeIterator& operator=(const BytecodeIterator&) = default;
bool operator==(const BytecodeIterator& other) const {
return other.current_ == current_;
bool operator!=(const BytecodeIterator& other) const {
return !(other.current_ == current_);
const BytecodeLocation& operator*() const { return current_; }
const BytecodeLocation* operator->() const { return &current_; }
// Pre-increment
BytecodeIterator& operator++() {
current_ =;
return *this;
// Post-increment
BytecodeIterator operator++(int) {
BytecodeIterator previous(*this);
current_ =;
return previous;
// Given a JSScript, allow the construction of a range based for-loop
// that will visit all script locations in that script.
class AllBytecodesIterable {
const JSScript* script_;
explicit AllBytecodesIterable(const JSScript* script) : script_(script) {}
BytecodeIterator begin();
BytecodeIterator end();
// Construct a range based iterator that will visit all bytecode locations
// between two given bytecode locations.
// `beginLoc_` is the bytecode location where the iterator will start, and
// `endLoc_` is the bytecode location where the iterator will end.
class BytecodeLocationRange {
BytecodeLocation beginLoc_;
BytecodeLocation endLoc_;
explicit BytecodeLocationRange(BytecodeLocation beginLoc,
BytecodeLocation endLoc)
: beginLoc_(beginLoc), endLoc_(endLoc) {
#ifdef DEBUG
BytecodeIterator begin();
BytecodeIterator end();
} // namespace js