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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 */
#include "vm/StencilCache.h"
#include "frontend/CompilationStencil.h"
#include "js/experimental/JSStencil.h"
#include "vm/MutexIDs.h"
: cache(js::mutexid::StencilCache), enabled(false) {}
js::StencilCache::AccessKey js::StencilCache::isSourceCached(
ScriptSource* src) {
if (!enabled) {
return cache.noAccess();
AccessKey lock(cache.lock());
if (!enabled) {
// As we checked the flag before taking the lock, we have to check again to
// avoid races on the cache manipulation.
return cache.noAccess();
if (!lock->watched.has(src)) {
// If the source does not have any cached function, and we do not expect to
// cache any delazification in the future, then skip any cache handling.
return cache.noAccess();
return lock;
bool js::StencilCache::startCaching(RefPtr<ScriptSource>&& src) {
auto guard = cache.lock();
if (!guard->watched.putNew(std::move(src))) {
return false;
enabled = true;
return true;
js::frontend::CompilationStencil* js::StencilCache::lookup(
AccessKey& guard, const StencilContext& key) {
auto ptr = guard->functions.lookup(key);
if (!ptr) {
return nullptr;
return ptr->value().get();
bool js::StencilCache::putNew(AccessKey& guard, const StencilContext& key,
js::frontend::CompilationStencil* value) {
return guard->functions.putNew(key, value);
// Important: This function should not be called within a scope checking for
// isSourceCached, as this would cause a dead-lock.
void js::StencilCache::clearAndDisable() {
auto guard = cache.lock();
enabled = false;
/* static */ js::DelazificationCache js::DelazificationCache::singleton;