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 "CachedTranscendentalFunction.h"
  33 #include "Collector.h"
  34 #include "DateInstanceCache.h"
  35 #include "ExecutableAllocator.h"
  36 #include "JITStubs.h"
  37 #include "JSValue.h"
  38 #include "MarkStack.h"
  39 #include "NumericStrings.h"
  40 #include "SmallStrings.h"
  41 #include "Terminator.h"
  42 #include "TimeoutChecker.h"
  43 #include "WeakRandom.h"
  44 #include <wtf/Forward.h>
  45 #include <wtf/HashMap.h>
  46 #include <wtf/RefCounted.h>
  47
  48 struct OpaqueJSClass;
  49 struct OpaqueJSClassContextData;
  50
  51 namespace JSC {
  52
  53     class CodeBlock;
  54     class CommonIdentifiers;
  55     class IdentifierTable;
  56     class Interpreter;
  57     class JSGlobalObject;
  58     class JSObject;
  59     class Lexer;
  60     class Parser;
  61     class RegExpCache;
  62     class Stringifier;
  63     class Structure;
  64     class UString;
  65
  66     struct HashTable;
  67     struct Instruction;
  68
  69     struct DSTOffsetCache {
  70         DSTOffsetCache()
  71         {
  72             reset();
  73         }
  74
  75         void reset()
  76         {
  77             offset = 0.0;
  78             start = 0.0;
  79             end = -1.0;
  80             increment = 0.0;
  81         }
  82
  83         double offset;
  84         double start;
  85         double end;
  86         double increment;
  87     };
  88
  89     enum ThreadStackType {
  90         ThreadStackTypeLarge,
  91         ThreadStackTypeSmall
  92     };
  93
  94     class JSGlobalData : public RefCounted<JSGlobalData> {
  95     public:
  96         // WebCore has a one-to-one mapping of threads to JSGlobalDatas;
  97         // either create() or createLeaked() should only be called once
  98         // on a thread, this is the 'default' JSGlobalData (it uses the
  99         // thread's default string uniquing table from wtfThreadData).
 100         // API contexts created using the new context group aware interface
 101         // create APIContextGroup objects which require less locking of JSC
 102         // than the old singleton APIShared JSGlobalData created for use by
 103         // the original API.
 104         enum GlobalDataType { Default, APIContextGroup, APIShared };
 105
 106         struct ClientData {
 107             virtual ~ClientData() = 0;
 108         };
 109
 110         bool isSharedInstance() { return globalDataType == APIShared; }
 111         static bool sharedInstanceExists();
 112         static JSGlobalData& sharedInstance();
 113
 114         static PassRefPtr<JSGlobalData> create(ThreadStackType);
 115         static PassRefPtr<JSGlobalData> createLeaked(ThreadStackType);
 116         static PassRefPtr<JSGlobalData> createContextGroup(ThreadStackType);
 117         ~JSGlobalData();
 118
 119 #if ENABLE(JSC_MULTIPLE_THREADS)
 120         // Will start tracking threads that use the heap, which is resource-heavy.
 121         void makeUsableFromMultipleThreads() { heap.makeUsableFromMultipleThreads(); }
 122 #endif
 123
 124         GlobalDataType globalDataType;
 125         ClientData* clientData;
 126
 127         const HashTable* arrayTable;
 128         const HashTable* dateTable;
 129         const HashTable* jsonTable;
 130         const HashTable* mathTable;
 131         const HashTable* numberTable;
 132         const HashTable* regExpTable;
 133         const HashTable* regExpConstructorTable;
 134         const HashTable* stringTable;
 135
 136         RefPtr<Structure> activationStructure;
 137         RefPtr<Structure> interruptedExecutionErrorStructure;
 138         RefPtr<Structure> terminatedExecutionErrorStructure;
 139         RefPtr<Structure> staticScopeStructure;
 140         RefPtr<Structure> stringStructure;
 141         RefPtr<Structure> notAnObjectErrorStubStructure;
 142         RefPtr<Structure> notAnObjectStructure;
 143         RefPtr<Structure> propertyNameIteratorStructure;
 144         RefPtr<Structure> getterSetterStructure;
 145         RefPtr<Structure> apiWrapperStructure;
 146         RefPtr<Structure> dummyMarkableCellStructure;
 147
 148 #if USE(JSVALUE32)
 149         RefPtr<Structure> numberStructure;
 150 #endif
 151
 152         static void storeVPtrs();
 153         static JS_EXPORTDATA void* jsArrayVPtr;
 154         static JS_EXPORTDATA void* jsByteArrayVPtr;
 155         static JS_EXPORTDATA void* jsStringVPtr;
 156         static JS_EXPORTDATA void* jsFunctionVPtr;
 157
 158         IdentifierTable* identifierTable;
 159         CommonIdentifiers* propertyNames;
 160         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.
 161         SmallStrings smallStrings;
 162         NumericStrings numericStrings;
 163         DateInstanceCache dateInstanceCache;
 164
 165 #if ENABLE(ASSEMBLER)
 166         ExecutableAllocator executableAllocator;
 167         ExecutableAllocator regexAllocator;
 168 #endif
 169
 170 #if ENABLE(JIT)
 171 #if ENABLE(INTERPRETER)
 172         bool canUseJIT() { return m_canUseJIT; }
 173 #endif
 174 #else
 175         bool canUseJIT() { return false; }
 176 #endif
 177         Lexer* lexer;
 178         Parser* parser;
 179         Interpreter* interpreter;
 180 #if ENABLE(JIT)
 181         OwnPtr<JITThunks> jitStubs;
 182         NativeExecutable* getThunk(ThunkGenerator generator)
 183         {
 184             return jitStubs->specializedThunk(this, generator);
 185         }
 186 #endif
 187         TimeoutChecker timeoutChecker;
 188         Terminator terminator;
 189         Heap heap;
 190
 191         JSValue exception;
 192 #if ENABLE(JIT)
 193         ReturnAddressPtr exceptionLocation;
 194 #endif
 195
 196         const Vector<Instruction>& numericCompareFunction(ExecState*);
 197         Vector<Instruction> lazyNumericCompareFunction;
 198         bool initializingLazyNumericCompareFunction;
 199
 200         HashMap<OpaqueJSClass*, OpaqueJSClassContextData*> opaqueJSClassData;
 201
 202         JSGlobalObject* head;
 203         JSGlobalObject* dynamicGlobalObject;
 204
 205         HashSet<JSObject*> arrayVisitedElements;
 206
 207         CodeBlock* functionCodeBlockBeingReparsed;
 208         Stringifier* firstStringifierToMark;
 209
 210         MarkStack markStack;
 211
 212         double cachedUTCOffset;
 213         DSTOffsetCache dstOffsetCache;
 214
 215         UString cachedDateString;
 216         double cachedDateStringValue;
 217
 218         int maxReentryDepth;
 219
 220         RegExpCache* m_regExpCache;
 221
 222 #ifndef NDEBUG
 223         ThreadIdentifier exclusiveThread;
 224 #endif
 225
 226         CachedTranscendentalFunction<sin> cachedSin;
 227
 228         void resetDateCache();
 229
 230         void startSampling();
 231         void stopSampling();
 232         void dumpSampleData(ExecState* exec);
 233         void recompileAllJSFunctions();
 234         RegExpCache* regExpCache() { return m_regExpCache; }
 235     private:
 236         JSGlobalData(GlobalDataType, ThreadStackType);
 237         static JSGlobalData*& sharedInstanceInternal();
 238         void createNativeThunk();
 239 #if ENABLE(JIT) && ENABLE(INTERPRETER)
 240         bool m_canUseJIT;
 241 #endif
 242     };
 243
 244 } // namespace JSC
 245
 246 #endif // JSGlobalData_h