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 #include <wtf/ThreadSpecific.h>

    48 

    49 struct OpaqueJSClass;

    50 struct OpaqueJSClassContextData;

    51 

    52 namespace JSC {

    53 

    54     class CodeBlock;

    55     class CommonIdentifiers;

    56     class IdentifierTable;

    57     class Interpreter;

    58     class JSGlobalObject;

    59     class JSObject;

    60     class Lexer;

    61     class Parser;

    62     class RegExpCache;

    63     class Stringifier;

    64     class Structure;

    65     class UString;

    66 

    67     struct HashTable;

    68     struct Instruction;    

    69 

    70     struct DSTOffsetCache {

    71         DSTOffsetCache()

    72         {

    73             reset();

    74         }

    75         

    76         void reset()

    77         {

    78             offset = 0.0;

    79             start = 0.0;

    80             end = -1.0;

    81             increment = 0.0;

    82         }

    83 

    84         double offset;

    85         double start;

    86         double end;

    87         double increment;

    88     };

    89 

    90     enum ThreadStackType {

    91         ThreadStackTypeLarge,

    92         ThreadStackTypeSmall

    93     };

    94 

    95     class JSGlobalData : public RefCounted<JSGlobalData> {

    96     public:

    97         // WebCore has a one-to-one mapping of threads to JSGlobalDatas;

    98         // either create() or createLeaked() should only be called once

    99         // on a thread, this is the 'default' JSGlobalData (it uses the

   100         // thread's default string uniquing table from wtfThreadData).

   101         // API contexts created using the new context group aware interface

   102         // create APIContextGroup objects which require less locking of JSC

   103         // than the old singleton APIShared JSGlobalData created for use by

   104         // the original API.

   105         enum GlobalDataType { Default, APIContextGroup, APIShared };

   106 

   107         struct ClientData {

   108             virtual ~ClientData() = 0;

   109         };

   110 

   111         bool isSharedInstance() { return globalDataType == APIShared; }

   112         static bool sharedInstanceExists();

   113         static JSGlobalData& sharedInstance();

   114 

   115         static PassRefPtr<JSGlobalData> create(ThreadStackType);

   116         static PassRefPtr<JSGlobalData> createLeaked(ThreadStackType);

   117         static PassRefPtr<JSGlobalData> createContextGroup(ThreadStackType);

   118         ~JSGlobalData();

   119 

   120 #if ENABLE(JSC_MULTIPLE_THREADS)

   121         // Will start tracking threads that use the heap, which is resource-heavy.

   122         void makeUsableFromMultipleThreads() { heap.makeUsableFromMultipleThreads(); }

   123 #endif

   124 

   125         GlobalDataType globalDataType;

   126         ClientData* clientData;

   127 

   128         const HashTable* arrayTable;

   129         const HashTable* dateTable;

   130         const HashTable* jsonTable;

   131         const HashTable* mathTable;

   132         const HashTable* numberTable;

   133         const HashTable* regExpTable;

   134         const HashTable* regExpConstructorTable;

   135         const HashTable* stringTable;

   136         

   137         RefPtr<Structure> activationStructure;

   138         RefPtr<Structure> interruptedExecutionErrorStructure;

   139         RefPtr<Structure> terminatedExecutionErrorStructure;

   140         RefPtr<Structure> staticScopeStructure;

   141         RefPtr<Structure> stringStructure;

   142         RefPtr<Structure> notAnObjectErrorStubStructure;

   143         RefPtr<Structure> notAnObjectStructure;

   144         RefPtr<Structure> propertyNameIteratorStructure;

   145         RefPtr<Structure> getterSetterStructure;

   146         RefPtr<Structure> apiWrapperStructure;

   147         RefPtr<Structure> dummyMarkableCellStructure;

   148 

   149 #if USE(JSVALUE32)

   150         RefPtr<Structure> numberStructure;

   151 #endif

   152 

   153         static void storeVPtrs();

   154         static JS_EXPORTDATA void* jsArrayVPtr;

   155         static JS_EXPORTDATA void* jsByteArrayVPtr;

   156         static JS_EXPORTDATA void* jsStringVPtr;

   157         static JS_EXPORTDATA void* jsFunctionVPtr;

   158 

   159         IdentifierTable* identifierTable;

   160         CommonIdentifiers* propertyNames;

   161         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.

   162         SmallStrings smallStrings;

   163         NumericStrings numericStrings;

   164         DateInstanceCache dateInstanceCache;

   165         

   166 #if ENABLE(ASSEMBLER)

   167         ExecutableAllocator executableAllocator;

   168 #endif

   169 

   170 #if !ENABLE(JIT)

   171         bool canUseJIT() { return false; } // interpreter only

   172 #elif !ENABLE(INTERPRETER)

   173         bool canUseJIT() { return true; } // jit only

   174 #else

   175         bool canUseJIT() { return m_canUseJIT; }

   176 #endif

   177         Lexer* lexer;

   178         Parser* parser;

   179         Interpreter* interpreter;

   180 #if ENABLE(JIT)

   181         OwnPtr<JITThunks> jitStubs;

   182         MacroAssemblerCodePtr getCTIStub(ThunkGenerator generator)

   183         {

   184             return jitStubs->ctiStub(this, generator);

   185         }

   186         PassRefPtr<NativeExecutable> getHostFunction(NativeFunction function);

   187         PassRefPtr<NativeExecutable> getHostFunction(NativeFunction function, ThunkGenerator generator);

   188 #endif

   189         TimeoutChecker timeoutChecker;

   190         Terminator terminator;

   191         Heap heap;

   192 

   193         JSValue exception;

   194 #if ENABLE(JIT)

   195         ReturnAddressPtr exceptionLocation;

   196 #endif

   197 

   198         HashMap<OpaqueJSClass*, OpaqueJSClassContextData*> opaqueJSClassData;

   199 

   200         JSGlobalObject* head;

   201         JSGlobalObject* dynamicGlobalObject;

   202 

   203         HashSet<JSObject*> arrayVisitedElements;

   204 

   205         CodeBlock* functionCodeBlockBeingReparsed;

   206         Stringifier* firstStringifierToMark;

   207 

   208         MarkStack markStack;

   209 

   210         double cachedUTCOffset;

   211         DSTOffsetCache dstOffsetCache;

   212         

   213         UString cachedDateString;

   214         double cachedDateStringValue;

   215         

   216         WeakRandom weakRandom;

   217 

   218         int maxReentryDepth;

   219 

   220         RegExpCache* m_regExpCache;

   221 

   222 #ifndef NDEBUG

   223         ThreadIdentifier exclusiveThread;

   224 #endif

   225 

   226         CachedTranscendentalFunction<sin> cachedSin;

   227         WTF::ThreadSpecific<char*> stackGuards;

   228 

   229         void resetDateCache();

   230 

   231         void startSampling();

   232         void stopSampling();

   233         void dumpSampleData(ExecState* exec);

   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