Source code

Revision control

Copy as Markdown

Other Tools

/* -*- 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 */
#include "vm/RegExpStatics.h"
#include "gc/Zone.h"
#include "vm/RegExpShared.h"
using namespace js;
// static
UniquePtr<RegExpStatics> RegExpStatics::create(JSContext* cx) {
return cx->make_unique<RegExpStatics>();
bool RegExpStatics::executeLazy(JSContext* cx) {
if (!pendingLazyEvaluation) {
return true;
MOZ_ASSERT(lazyIndex != size_t(-1));
/* Retrieve or create the RegExpShared in this zone. */
Rooted<JSAtom*> source(cx, lazySource);
RootedRegExpShared shared(cx,
cx->zone()->regExps().get(cx, source, lazyFlags));
if (!shared) {
return false;
* It is not necessary to call aboutToWrite(): evaluation of
* implicit copies is safe.
/* Execute the full regular expression. */
Rooted<JSLinearString*> input(cx, matchesInput);
RegExpRunStatus status =
RegExpShared::execute(cx, &shared, input, lazyIndex, &this->matches);
if (status == RegExpRunStatus_Error) {
return false;
* RegExpStatics are only updated on successful (matching) execution.
* Re-running the same expression must therefore produce a matching result.
MOZ_ASSERT(status == RegExpRunStatus_Success);
/* Unset lazy state and remove rooted values that now have no use. */
pendingLazyEvaluation = false;
lazySource = nullptr;
lazyIndex = size_t(-1);
return true;