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