| /* |
| * Copyright (C) 2008, 2009 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
| * its contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef EvalCodeCache_h |
| #define EvalCodeCache_h |
| |
| #include "Executable.h" |
| #include "JSGlobalObject.h" |
| #include "Nodes.h" |
| #include "Parser.h" |
| #include "SourceCode.h" |
| #include <wtf/HashMap.h> |
| #include <wtf/RefPtr.h> |
| #include <wtf/text/StringHash.h> |
| |
| namespace JSC { |
| |
| class SlotVisitor; |
| |
| class EvalCodeCache { |
| public: |
| EvalExecutable* tryGet(bool inStrictContext, const String& evalSource, JSScope* scope) |
| { |
| if (!inStrictContext && evalSource.length() < maxCacheableSourceLength && scope->begin()->isVariableObject()) |
| return m_cacheMap.get(evalSource.impl()).get(); |
| return 0; |
| } |
| |
| EvalExecutable* getSlow(ExecState* exec, ScriptExecutable* owner, bool inStrictContext, const String& evalSource, JSScope* scope, JSValue& exceptionValue) |
| { |
| EvalExecutable* evalExecutable = EvalExecutable::create(exec, makeSource(evalSource), inStrictContext); |
| exceptionValue = evalExecutable->compile(exec, scope); |
| if (exceptionValue) |
| return 0; |
| |
| if (!inStrictContext && evalSource.length() < maxCacheableSourceLength && scope->begin()->isVariableObject() && m_cacheMap.size() < maxCacheEntries) |
| m_cacheMap.set(evalSource.impl(), WriteBarrier<EvalExecutable>(exec->globalData(), owner, evalExecutable)); |
| |
| return evalExecutable; |
| } |
| |
| EvalExecutable* get(ExecState* exec, ScriptExecutable* owner, bool inStrictContext, const String& evalSource, JSScope* scope, JSValue& exceptionValue) |
| { |
| EvalExecutable* evalExecutable = tryGet(inStrictContext, evalSource, scope); |
| |
| if (!evalExecutable) |
| evalExecutable = getSlow(exec, owner, inStrictContext, evalSource, scope, exceptionValue); |
| |
| return evalExecutable; |
| } |
| |
| bool isEmpty() const { return m_cacheMap.isEmpty(); } |
| |
| void visitAggregate(SlotVisitor&); |
| |
| void clear() |
| { |
| m_cacheMap.clear(); |
| } |
| |
| private: |
| static const unsigned maxCacheableSourceLength = 256; |
| static const int maxCacheEntries = 64; |
| |
| typedef HashMap<RefPtr<StringImpl>, WriteBarrier<EvalExecutable> > EvalCacheMap; |
| EvalCacheMap m_cacheMap; |
| }; |
| |
| } // namespace JSC |
| |
| #endif // EvalCodeCache_h |