runtime/JSGlobalData.h

   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 JSGlobalData_h
  30 #define JSGlobalData_h
  31
  32 #include "Collector.h"
  33 #include "DateInstanceCache.h"
  34 #include "ExecutableAllocator.h"
  35 #include "JITStubs.h"
  36 #include "JSValue.h"
  37 #include "MarkStack.h"
  38 #include "NumericStrings.h"
  39 #include "SmallStrings.h"
  40 #include "TimeoutChecker.h"
  41 #include "WeakRandom.h"
  42 #include <wtf/Forward.h>
  43 #include <wtf/HashMap.h>
  44 #include <wtf/RefCounted.h>
  45
  46 struct OpaqueJSClass;
  47 struct OpaqueJSClassContextData;
  48
  49 namespace JSC {
  50
  51     class CodeBlock;
  52     class CommonIdentifiers;
  53     class IdentifierTable;
  54     class Interpreter;
  55     class JSGlobalObject;
  56     class JSObject;
  57     class Lexer;
  58     class Parser;
  59     class Stringifier;
  60     class Structure;
  61     class UString;
  62
  63     struct HashTable;
  64     struct Instruction;
  65
  66     struct DSTOffsetCache {
  67         DSTOffsetCache()
  68         {
  69             reset();
  70         }
  71
  72         void reset()
  73         {
  74             offset = 0.0;
  75             start = 0.0;
  76             end = -1.0;
  77             increment = 0.0;
  78         }
  79
  80         double offset;
  81         double start;
  82         double end;
  83         double increment;
  84     };
  85
  86     class JSGlobalData : public RefCounted<JSGlobalData> {
  87     public:
  88         struct ClientData {
  89             virtual ~ClientData() = 0;
  90         };
  91
  92         static bool sharedInstanceExists();
  93         static JSGlobalData& sharedInstance();
  94
  95         static PassRefPtr<JSGlobalData> create();
  96         static PassRefPtr<JSGlobalData> createLeaked();
  97         static PassRefPtr<JSGlobalData> createNonDefault();
  98         ~JSGlobalData();
  99
 100 #if ENABLE(JSC_MULTIPLE_THREADS)
 101         // Will start tracking threads that use the heap, which is resource-heavy.
 102         void makeUsableFromMultipleThreads() { heap.makeUsableFromMultipleThreads(); }
 103 #endif
 104
 105         bool isSharedInstance;
 106         ClientData* clientData;
 107
 108         const HashTable* arrayTable;
 109         const HashTable* dateTable;
 110         const HashTable* jsonTable;
 111         const HashTable* mathTable;
 112         const HashTable* numberTable;
 113         const HashTable* regExpTable;
 114         const HashTable* regExpConstructorTable;
 115         const HashTable* stringTable;
 116
 117         RefPtr<Structure> activationStructure;
 118         RefPtr<Structure> interruptedExecutionErrorStructure;
 119         RefPtr<Structure> staticScopeStructure;
 120         RefPtr<Structure> stringStructure;
 121         RefPtr<Structure> notAnObjectErrorStubStructure;
 122         RefPtr<Structure> notAnObjectStructure;
 123         RefPtr<Structure> propertyNameIteratorStructure;
 124         RefPtr<Structure> getterSetterStructure;
 125         RefPtr<Structure> apiWrapperStructure;
 126         RefPtr<Structure> dummyMarkableCellStructure;
 127
 128 #if USE(JSVALUE32)
 129         RefPtr<Structure> numberStructure;
 130 #endif
 131
 132         static void storeVPtrs();
 133         static JS_EXPORTDATA void* jsArrayVPtr;
 134         static JS_EXPORTDATA void* jsByteArrayVPtr;
 135         static JS_EXPORTDATA void* jsStringVPtr;
 136         static JS_EXPORTDATA void* jsFunctionVPtr;
 137
 138         IdentifierTable* identifierTable;
 139         CommonIdentifiers* propertyNames;
 140         const MarkedArgumentBuffer* emptyList; // Lists are supposed to be allocated on the stack to have their elements properly marked, which is not the case here - but this list has nothing to mark.
 141         SmallStrings smallStrings;
 142         NumericStrings numericStrings;
 143         DateInstanceCache dateInstanceCache;
 144
 145 #if ENABLE(ASSEMBLER)
 146         ExecutableAllocator executableAllocator;
 147 #endif
 148
 149         Lexer* lexer;
 150         Parser* parser;
 151         Interpreter* interpreter;
 152 #if ENABLE(JIT)
 153         JITThunks jitStubs;
 154 #endif
 155         TimeoutChecker timeoutChecker;
 156         Heap heap;
 157
 158         JSValue exception;
 159 #if ENABLE(JIT)
 160         ReturnAddressPtr exceptionLocation;
 161 #endif
 162
 163         const Vector<Instruction>& numericCompareFunction(ExecState*);
 164         Vector<Instruction> lazyNumericCompareFunction;
 165         bool initializingLazyNumericCompareFunction;
 166
 167         HashMap<OpaqueJSClass*, OpaqueJSClassContextData*> opaqueJSClassData;
 168
 169         JSGlobalObject* head;
 170         JSGlobalObject* dynamicGlobalObject;
 171
 172         HashSet<JSObject*> arrayVisitedElements;
 173
 174         CodeBlock* functionCodeBlockBeingReparsed;
 175         Stringifier* firstStringifierToMark;
 176
 177         MarkStack markStack;
 178
 179         double cachedUTCOffset;
 180         DSTOffsetCache dstOffsetCache;
 181
 182         UString cachedDateString;
 183         double cachedDateStringValue;
 184
 185         WeakRandom weakRandom;
 186
 187 #ifndef NDEBUG
 188         bool mainThreadOnly;
 189 #endif
 190
 191         void resetDateCache();
 192
 193         void startSampling();
 194         void stopSampling();
 195         void dumpSampleData(ExecState* exec);
 196     private:
 197         JSGlobalData(bool isShared);
 198         static JSGlobalData*& sharedInstanceInternal();
 199         void createNativeThunk();
 200     };
 201
 202 } // namespace JSC
 203
 204 #endif // JSGlobalData_h