parser/SourceProviderCacheItem.h

   1 /*
   2  * Copyright (C) 2011 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  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  23  * THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef SourceProviderCacheItem_h
  27 #define SourceProviderCacheItem_h
  28
  29 #include "ParserTokens.h"
  30 #include <wtf/PassOwnPtr.h>
  31 #include <wtf/Vector.h>
  32 #include <wtf/text/WTFString.h>
  33
  34 namespace JSC {
  35
  36 struct SourceProviderCacheItemCreationParameters {
  37     unsigned functionNameStart;
  38     unsigned closeBraceLine;
  39     unsigned closeBraceOffset;
  40     unsigned closeBraceLineStartOffset;
  41     bool needsFullActivation;
  42     bool usesEval;
  43     bool strictMode;
  44     Vector<RefPtr<StringImpl>> usedVariables;
  45     Vector<RefPtr<StringImpl>> writtenVariables;
  46 };
  47
  48 #if COMPILER(MSVC)
  49 #pragma warning(push)
  50 #pragma warning(disable: 4200) // Disable "zero-sized array in struct/union" warning
  51 #endif
  52
  53 class SourceProviderCacheItem {
  54     WTF_MAKE_FAST_ALLOCATED;
  55 public:
  56     static std::unique_ptr<SourceProviderCacheItem> create(const SourceProviderCacheItemCreationParameters&);
  57     ~SourceProviderCacheItem();
  58
  59     JSToken closeBraceToken() const
  60     {
  61         JSToken token;
  62         token.m_type = CLOSEBRACE;
  63         token.m_data.offset = closeBraceOffset;
  64         token.m_location.startOffset = closeBraceOffset;
  65         token.m_location.endOffset = closeBraceOffset + 1;
  66         token.m_location.line = closeBraceLine;
  67         token.m_location.lineStartOffset = closeBraceLineStartOffset;
  68         // token.m_location.sourceOffset is initialized once by the client. So,
  69         // we do not need to set it here.
  70         return token;
  71     }
  72
  73     unsigned functionNameStart : 31;
  74     bool needsFullActivation : 1;
  75
  76     unsigned closeBraceLine : 31;
  77     bool usesEval : 1;
  78
  79     unsigned closeBraceOffset : 31;
  80     bool strictMode : 1;
  81
  82     unsigned closeBraceLineStartOffset;
  83     unsigned usedVariablesCount;
  84     unsigned writtenVariablesCount;
  85
  86     StringImpl** usedVariables() const { return const_cast<StringImpl**>(m_variables); }
  87     StringImpl** writtenVariables() const { return const_cast<StringImpl**>(&m_variables[usedVariablesCount]); }
  88
  89 private:
  90     SourceProviderCacheItem(const SourceProviderCacheItemCreationParameters&);
  91
  92     StringImpl* m_variables[0];
  93 };
  94
  95 inline SourceProviderCacheItem::~SourceProviderCacheItem()
  96 {
  97     for (unsigned i = 0; i < usedVariablesCount + writtenVariablesCount; ++i)
  98         m_variables[i]->deref();
  99 }
 100
 101 inline std::unique_ptr<SourceProviderCacheItem> SourceProviderCacheItem::create(const SourceProviderCacheItemCreationParameters& parameters)
 102 {
 103     size_t variableCount = parameters.writtenVariables.size() + parameters.usedVariables.size();
 104     size_t objectSize = sizeof(SourceProviderCacheItem) + sizeof(StringImpl*) * variableCount;
 105     void* slot = fastMalloc(objectSize);
 106     return std::unique_ptr<SourceProviderCacheItem>(new (slot) SourceProviderCacheItem(parameters));
 107 }
 108
 109 inline SourceProviderCacheItem::SourceProviderCacheItem(const SourceProviderCacheItemCreationParameters& parameters)
 110     : functionNameStart(parameters.functionNameStart)
 111     , needsFullActivation(parameters.needsFullActivation)
 112     , closeBraceLine(parameters.closeBraceLine)
 113     , usesEval(parameters.usesEval)
 114     , closeBraceOffset(parameters.closeBraceOffset)
 115     , strictMode(parameters.strictMode)
 116     , closeBraceLineStartOffset(parameters.closeBraceLineStartOffset)
 117     , usedVariablesCount(parameters.usedVariables.size())
 118     , writtenVariablesCount(parameters.writtenVariables.size())
 119 {
 120     unsigned j = 0;
 121     for (unsigned i = 0; i < usedVariablesCount; ++i, ++j) {
 122         m_variables[j] = parameters.usedVariables[i].get();
 123         m_variables[j]->ref();
 124     }
 125     for (unsigned i = 0; i < writtenVariablesCount; ++i, ++j) {
 126         m_variables[j] = parameters.writtenVariables[i].get();
 127         m_variables[j]->ref();
 128     }
 129 }
 130
 131 #if COMPILER(MSVC)
 132 #pragma warning(pop)
 133 #endif
 134
 135 }
 136
 137 #endif // SourceProviderCacheItem_h