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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: | |
44 | PassRefPtr<EvalNode> get(ExecState* exec, const UString& evalSource, ScopeChainNode* scopeChain, JSValuePtr& 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 | ||
69 | bool isEmpty() const { return m_cacheMap.isEmpty(); } | |
70 | ||
71 | void mark() | |
72 | { | |
73 | EvalCacheMap::iterator end = m_cacheMap.end(); | |
74 | for (EvalCacheMap::iterator ptr = m_cacheMap.begin(); ptr != end; ++ptr) | |
75 | ptr->second->mark(); | |
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 |