Imported WebKit commit 2ea9d364d0f6efa8fa64acf19f451504c59be0e4 (http://svn.webkit.org/repository/webkit/trunk@104285)

1 files changed, 386 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/runtime/JSGlobalData.h b/Source/JavaScriptCore/runtime/JSGlobalData.h
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+/*
+ * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer. 
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution. 
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef JSGlobalData_h
+#define JSGlobalData_h
+
+#include "CachedTranscendentalFunction.h"
+#include "Intrinsic.h"
+#include "DateInstanceCache.h"
+#include "ExecutableAllocator.h"
+#include "Heap.h"
+#include "Strong.h"
+#include "JITStubs.h"
+#include "JSValue.h"
+#include "NumericStrings.h"
+#include "SmallStrings.h"
+#include "Terminator.h"
+#include "TimeoutChecker.h"
+#include "WeakRandom.h"
+#include <wtf/BumpPointerAllocator.h>
+#include <wtf/Forward.h>
+#include <wtf/HashMap.h>
+#include <wtf/RefCounted.h>
+#include <wtf/ThreadSpecific.h>
+#include <wtf/WTFThreadData.h>
+#if ENABLE(REGEXP_TRACING)
+#include <wtf/ListHashSet.h>
+#endif
+
+struct OpaqueJSClass;
+struct OpaqueJSClassContextData;
+
+namespace JSC {
+
+    class CodeBlock;
+    class CommonIdentifiers;
+    class HandleStack;
+    class IdentifierTable;
+    class Interpreter;
+    class JSGlobalObject;
+    class JSObject;
+    class Keywords;
+    class NativeExecutable;
+    class ParserArena;
+    class RegExpCache;
+    class Stringifier;
+    class Structure;
+    class UString;
+#if ENABLE(REGEXP_TRACING)
+    class RegExp;
+#endif
+
+    struct HashTable;
+    struct Instruction;
+
+    struct DSTOffsetCache {
+        DSTOffsetCache()
+        {
+            reset();
+        }
+        
+        void reset()
+        {
+            offset = 0.0;
+            start = 0.0;
+            end = -1.0;
+            increment = 0.0;
+        }
+
+        double offset;
+        double start;
+        double end;
+        double increment;
+    };
+
+    enum ThreadStackType {
+        ThreadStackTypeLarge,
+        ThreadStackTypeSmall
+    };
+
+    struct TypedArrayDescriptor {
+        TypedArrayDescriptor()
+            : m_classInfo(0)
+            , m_storageOffset(0)
+            , m_lengthOffset(0)
+        {
+        }
+        TypedArrayDescriptor(const ClassInfo* classInfo, size_t storageOffset, size_t lengthOffset)
+            : m_classInfo(classInfo)
+            , m_storageOffset(storageOffset)
+            , m_lengthOffset(lengthOffset)
+        {
+        }
+        const ClassInfo* m_classInfo;
+        size_t m_storageOffset;
+        size_t m_lengthOffset;
+    };
+    
+    class JSGlobalData : public RefCounted<JSGlobalData> {
+    public:
+        // WebCore has a one-to-one mapping of threads to JSGlobalDatas;
+        // either create() or createLeaked() should only be called once
+        // on a thread, this is the 'default' JSGlobalData (it uses the
+        // thread's default string uniquing table from wtfThreadData).
+        // API contexts created using the new context group aware interface
+        // create APIContextGroup objects which require less locking of JSC
+        // than the old singleton APIShared JSGlobalData created for use by
+        // the original API.
+        enum GlobalDataType { Default, APIContextGroup, APIShared };
+        
+        struct ClientData {
+            virtual ~ClientData() = 0;
+        };
+
+        bool isSharedInstance() { return globalDataType == APIShared; }
+        bool usingAPI() { return globalDataType != Default; }
+        static bool sharedInstanceExists();
+        static JSGlobalData& sharedInstance();
+
+        static PassRefPtr<JSGlobalData> create(ThreadStackType, HeapSize = SmallHeap);
+        static PassRefPtr<JSGlobalData> createLeaked(ThreadStackType, HeapSize = SmallHeap);
+        static PassRefPtr<JSGlobalData> createContextGroup(ThreadStackType, HeapSize = SmallHeap);
+        ~JSGlobalData();
+
+        void makeUsableFromMultipleThreads() { heap.machineThreads().makeUsableFromMultipleThreads(); }
+
+        GlobalDataType globalDataType;
+        ClientData* clientData;
+        CallFrame* topCallFrame;
+
+        const HashTable* arrayConstructorTable;
+        const HashTable* arrayPrototypeTable;
+        const HashTable* booleanPrototypeTable;
+        const HashTable* dateTable;
+        const HashTable* dateConstructorTable;
+        const HashTable* errorPrototypeTable;
+        const HashTable* globalObjectTable;
+        const HashTable* jsonTable;
+        const HashTable* mathTable;
+        const HashTable* numberConstructorTable;
+        const HashTable* numberPrototypeTable;
+        const HashTable* objectConstructorTable;
+        const HashTable* objectPrototypeTable;
+        const HashTable* regExpTable;
+        const HashTable* regExpConstructorTable;
+        const HashTable* regExpPrototypeTable;
+        const HashTable* stringTable;
+        const HashTable* stringConstructorTable;
+        
+        Strong<Structure> structureStructure;
+        Strong<Structure> debuggerActivationStructure;
+        Strong<Structure> activationStructure;
+        Strong<Structure> interruptedExecutionErrorStructure;
+        Strong<Structure> terminatedExecutionErrorStructure;
+        Strong<Structure> staticScopeStructure;
+        Strong<Structure> strictEvalActivationStructure;
+        Strong<Structure> stringStructure;
+        Strong<Structure> notAnObjectStructure;
+        Strong<Structure> propertyNameIteratorStructure;
+        Strong<Structure> getterSetterStructure;
+        Strong<Structure> apiWrapperStructure;
+        Strong<Structure> scopeChainNodeStructure;
+        Strong<Structure> executableStructure;
+        Strong<Structure> nativeExecutableStructure;
+        Strong<Structure> evalExecutableStructure;
+        Strong<Structure> programExecutableStructure;
+        Strong<Structure> functionExecutableStructure;
+        Strong<Structure> regExpStructure;
+        Strong<Structure> structureChainStructure;
+
+        IdentifierTable* identifierTable;
+        CommonIdentifiers* propertyNames;
+        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.
+        SmallStrings smallStrings;
+        NumericStrings numericStrings;
+        DateInstanceCache dateInstanceCache;
+        Vector<CodeBlock*> codeBlocksBeingCompiled;
+        void startedCompiling(CodeBlock* codeBlock)
+        {
+            codeBlocksBeingCompiled.append(codeBlock);
+        }
+
+        void finishedCompiling(CodeBlock* codeBlock)
+        {
+            ASSERT_UNUSED(codeBlock, codeBlock == codeBlocksBeingCompiled.last());
+            codeBlocksBeingCompiled.removeLast();
+        }
+
+#if ENABLE(ASSEMBLER)
+        ExecutableAllocator executableAllocator;
+#endif
+
+#if !ENABLE(JIT)
+        bool canUseJIT() { return false; } // interpreter only
+#elif !ENABLE(INTERPRETER)
+        bool canUseJIT() { return true; } // jit only
+#else
+        bool canUseJIT() { return m_canUseJIT; }
+#endif
+
+        const StackBounds& stack()
+        {
+            return (globalDataType == Default)
+                ? m_stack
+                : wtfThreadData().stack();
+        }
+
+        OwnPtr<ParserArena> parserArena;
+        OwnPtr<Keywords> keywords;
+        Interpreter* interpreter;
+#if ENABLE(JIT)
+        OwnPtr<JITThunks> jitStubs;
+        MacroAssemblerCodeRef getCTIStub(ThunkGenerator generator)
+        {
+            return jitStubs->ctiStub(this, generator);
+        }
+        NativeExecutable* getHostFunction(NativeFunction, Intrinsic);
+#endif
+        NativeExecutable* getHostFunction(NativeFunction, NativeFunction constructor);
+
+        TimeoutChecker timeoutChecker;
+        Terminator terminator;
+        Heap heap;
+
+        JSValue exception;
+#if ENABLE(JIT)
+        ReturnAddressPtr exceptionLocation;
+        JSValue hostCallReturnValue;
+#if ENABLE(DFG_JIT)
+        uint32_t osrExitIndex;
+        void* osrExitJumpDestination;
+        Vector<void*> scratchBuffers;
+        size_t sizeOfLastScratchBuffer;
+        
+        void* scratchBufferForSize(size_t size)
+        {
+            if (!size)
+                return 0;
+            
+            if (size > sizeOfLastScratchBuffer) {
+                // Protect against a N^2 memory usage pathology by ensuring
+                // that at worst, we get a geometric series, meaning that the
+                // total memory usage is somewhere around
+                // max(scratch buffer size) * 4.
+                sizeOfLastScratchBuffer = size * 2;
+                
+                scratchBuffers.append(fastMalloc(sizeOfLastScratchBuffer));
+            }
+            
+            return scratchBuffers.last();
+        }
+#endif
+#endif
+
+        HashMap<OpaqueJSClass*, OwnPtr<OpaqueJSClassContextData> > opaqueJSClassData;
+
+        JSGlobalObject* dynamicGlobalObject;
+
+        HashSet<JSObject*> stringRecursionCheckVisitedObjects;
+
+        double cachedUTCOffset;
+        DSTOffsetCache dstOffsetCache;
+        
+        UString cachedDateString;
+        double cachedDateStringValue;
+
+        int maxReentryDepth;
+
+        RegExpCache* m_regExpCache;
+        BumpPointerAllocator m_regExpAllocator;
+
+#if ENABLE(REGEXP_TRACING)
+        typedef ListHashSet<RefPtr<RegExp> > RTTraceList;
+        RTTraceList* m_rtTraceList;
+#endif
+
+#ifndef NDEBUG
+        ThreadIdentifier exclusiveThread;
+#endif
+
+        CachedTranscendentalFunction<sin> cachedSin;
+
+        void resetDateCache();
+
+        void startSampling();
+        void stopSampling();
+        void dumpSampleData(ExecState* exec);
+        void recompileAllJSFunctions();
+        RegExpCache* regExpCache() { return m_regExpCache; }
+#if ENABLE(REGEXP_TRACING)
+        void addRegExpToTrace(PassRefPtr<RegExp> regExp);
+#endif
+        void dumpRegExpTrace();
+        void clearBuiltinStructures();
+
+        bool isCollectorBusy() { return heap.isBusy(); }
+        void releaseExecutableMemory();
+
+#if ENABLE(GC_VALIDATION)
+        bool isInitializingObject() const; 
+        void setInitializingObject(bool);
+#endif
+
+#if CPU(X86) && ENABLE(JIT)
+        unsigned m_timeoutCount;
+#endif
+
+#define registerTypedArrayFunction(type, capitalizedType) \
+        void registerTypedArrayDescriptor(const capitalizedType##Array*, const TypedArrayDescriptor& descriptor) \
+        { \
+            ASSERT(!m_##type##ArrayDescriptor.m_classInfo || m_##type##ArrayDescriptor.m_classInfo == descriptor.m_classInfo); \
+            m_##type##ArrayDescriptor = descriptor; \
+        } \
+        const TypedArrayDescriptor& type##ArrayDescriptor() const { return m_##type##ArrayDescriptor; }
+
+        registerTypedArrayFunction(int8, Int8);
+        registerTypedArrayFunction(int16, Int16);
+        registerTypedArrayFunction(int32, Int32);
+        registerTypedArrayFunction(uint8, Uint8);
+        registerTypedArrayFunction(uint16, Uint16);
+        registerTypedArrayFunction(uint32, Uint32);
+        registerTypedArrayFunction(float32, Float32);
+        registerTypedArrayFunction(float64, Float64);
+#undef registerTypedArrayFunction
+
+    private:
+        JSGlobalData(GlobalDataType, ThreadStackType, HeapSize);
+        static JSGlobalData*& sharedInstanceInternal();
+        void createNativeThunk();
+#if ENABLE(JIT) && ENABLE(INTERPRETER)
+        bool m_canUseJIT;
+#endif
+        StackBounds m_stack;
+#if ENABLE(GC_VALIDATION)
+        bool m_isInitializingObject;
+#endif
+        TypedArrayDescriptor m_int8ArrayDescriptor;
+        TypedArrayDescriptor m_int16ArrayDescriptor;
+        TypedArrayDescriptor m_int32ArrayDescriptor;
+        TypedArrayDescriptor m_uint8ArrayDescriptor;
+        TypedArrayDescriptor m_uint16ArrayDescriptor;
+        TypedArrayDescriptor m_uint32ArrayDescriptor;
+        TypedArrayDescriptor m_float32ArrayDescriptor;
+        TypedArrayDescriptor m_float64ArrayDescriptor;
+    };
+
+#if ENABLE(GC_VALIDATION)
+    inline bool JSGlobalData::isInitializingObject() const
+    {
+        return m_isInitializingObject;
+    }
+
+    inline void JSGlobalData::setInitializingObject(bool initializingObject)
+    {
+        m_isInitializingObject = initializingObject;
+    }
+#endif
+
+} // namespace JSC
+
+#endif // JSGlobalData_h