/* -*- 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 http://mozilla.org/MPL/2.0/. */ #include "vm/StencilCache.h" #include "frontend/CompilationStencil.h" #include "js/experimental/JSStencil.h" #include "vm/MutexIDs.h" js::StencilCache::StencilCache() : 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(); guard->functions.clearAndCompact(); guard->watched.clearAndCompact(); enabled = false; } /* static */ js::DelazificationCache js::DelazificationCache::singleton;