1 /* 2 * Copyright (C) 2008, 2009 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 14 * its contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #ifndef EvalCodeCache_h 30 #define EvalCodeCache_h 31 32 #include "JSGlobalObject.h" 33 #include "Nodes.h" 34 #include "Parser.h" 35 #include "SourceCode.h" 36 #include "UString.h" 37 #include <wtf/HashMap.h> 38 #include <wtf/RefPtr.h> 39 40 namespace JSC { 41 42 class EvalCodeCache { 43 public: get(ExecState * exec,const UString & evalSource,ScopeChainNode * scopeChain,JSValue & exceptionValue)44 PassRefPtr<EvalNode> get(ExecState* exec, const UString& evalSource, ScopeChainNode* scopeChain, JSValue& exceptionValue) 45 { 46 RefPtr<EvalNode> evalNode; 47 48 if (evalSource.size() < maxCacheableSourceLength && (*scopeChain->begin())->isVariableObject()) 49 evalNode = m_cacheMap.get(evalSource.rep()); 50 51 if (!evalNode) { 52 int errorLine; 53 UString errorMessage; 54 55 SourceCode source = makeSource(evalSource); 56 evalNode = exec->globalData().parser->parse<EvalNode>(exec, exec->dynamicGlobalObject()->debugger(), source, &errorLine, &errorMessage); 57 if (evalNode) { 58 if (evalSource.size() < maxCacheableSourceLength && (*scopeChain->begin())->isVariableObject() && m_cacheMap.size() < maxCacheEntries) 59 m_cacheMap.set(evalSource.rep(), evalNode); 60 } else { 61 exceptionValue = Error::create(exec, SyntaxError, errorMessage, errorLine, source.provider()->asID(), 0); 62 return 0; 63 } 64 } 65 66 return evalNode.release(); 67 } 68 isEmpty()69 bool isEmpty() const { return m_cacheMap.isEmpty(); } 70 markAggregate(MarkStack & markStack)71 void markAggregate(MarkStack& markStack) 72 { 73 EvalCacheMap::iterator end = m_cacheMap.end(); 74 for (EvalCacheMap::iterator ptr = m_cacheMap.begin(); ptr != end; ++ptr) 75 ptr->second->markAggregate(markStack); 76 } 77 private: 78 static const int maxCacheableSourceLength = 256; 79 static const int maxCacheEntries = 64; 80 81 typedef HashMap<RefPtr<UString::Rep>, RefPtr<EvalNode> > EvalCacheMap; 82 EvalCacheMap m_cacheMap; 83 }; 84 85 } // namespace JSC 86 87 #endif // EvalCodeCache_h 88