C++ (Cpp) JSCell::vptr 예제들

예제 #1

파일: JSGlobalData.cpp 프로젝트: mulriple/Webkit-Projects

void JSGlobalData::storeVPtrs()
{
    // Enough storage to fit a JSArray, JSByteArray, JSString, or JSFunction.
    // COMPILE_ASSERTS below check that this is true.
    char storage[64];

    COMPILE_ASSERT(sizeof(JSArray) <= sizeof(storage), sizeof_JSArray_must_be_less_than_storage);
    JSCell* jsArray = new (storage) JSArray(JSArray::VPtrStealingHack);
    CLOBBER_MEMORY();
    JSGlobalData::jsArrayVPtr = jsArray->vptr();

    COMPILE_ASSERT(sizeof(JSByteArray) <= sizeof(storage), sizeof_JSByteArray_must_be_less_than_storage);
    JSCell* jsByteArray = new (storage) JSByteArray(JSByteArray::VPtrStealingHack);
    CLOBBER_MEMORY();
    JSGlobalData::jsByteArrayVPtr = jsByteArray->vptr();

    COMPILE_ASSERT(sizeof(JSString) <= sizeof(storage), sizeof_JSString_must_be_less_than_storage);
    JSCell* jsString = new (storage) JSString(JSString::VPtrStealingHack);
    CLOBBER_MEMORY();
    JSGlobalData::jsStringVPtr = jsString->vptr();

    COMPILE_ASSERT(sizeof(JSFunction) <= sizeof(storage), sizeof_JSFunction_must_be_less_than_storage);
    JSCell* jsFunction = new (storage) JSFunction(JSCell::VPtrStealingHack);
    CLOBBER_MEMORY();
    JSGlobalData::jsFunctionVPtr = jsFunction->vptr();
}

예제 #2

파일: JSGlobalData.cpp 프로젝트: chrisguan/Olympia_on_Desktop

void JSGlobalData::storeVPtrs()
{
    CollectorCell cell;
    void* storage = &cell;

    COMPILE_ASSERT(sizeof(JSArray) <= sizeof(CollectorCell), sizeof_JSArray_must_be_less_than_CollectorCell);
    JSCell* jsArray = new (storage) JSArray(JSArray::createStructure(jsNull()));
    JSGlobalData::jsArrayVPtr = jsArray->vptr();
    jsArray->~JSCell();

    COMPILE_ASSERT(sizeof(JSByteArray) <= sizeof(CollectorCell), sizeof_JSByteArray_must_be_less_than_CollectorCell);
    JSCell* jsByteArray = new (storage) JSByteArray(JSByteArray::VPtrStealingHack);
    JSGlobalData::jsByteArrayVPtr = jsByteArray->vptr();
    jsByteArray->~JSCell();

    COMPILE_ASSERT(sizeof(JSString) <= sizeof(CollectorCell), sizeof_JSString_must_be_less_than_CollectorCell);
    JSCell* jsString = new (storage) JSString(JSString::VPtrStealingHack);
    JSGlobalData::jsStringVPtr = jsString->vptr();
    jsString->~JSCell();

    COMPILE_ASSERT(sizeof(JSFunction) <= sizeof(CollectorCell), sizeof_JSFunction_must_be_less_than_CollectorCell);
    JSCell* jsFunction = new (storage) JSFunction(JSFunction::createStructure(jsNull()));
    JSGlobalData::jsFunctionVPtr = jsFunction->vptr();
    jsFunction->~JSCell();
}

예제 #3

파일: JSGlobalData.cpp 프로젝트: dtebbs/javascriptcore-webkitgtk-1.4.2

void JSGlobalData::storeVPtrs()
{
    // Enough storage to fit a JSArray, JSByteArray, JSString, or JSFunction.
    // COMPILE_ASSERTS below check that this is true.
    char storage[64];

    COMPILE_ASSERT(sizeof(JSArray) <= sizeof(storage), sizeof_JSArray_must_be_less_than_storage);
    JSCell* jsArray = new (storage) JSArray(JSArray::VPtrStealingHack);
    JSGlobalData::jsArrayVPtr = jsArray->vptr();
    jsArray->~JSCell();

    COMPILE_ASSERT(sizeof(JSByteArray) <= sizeof(storage), sizeof_JSByteArray_must_be_less_than_storage);
    JSCell* jsByteArray = new (storage) JSByteArray(JSByteArray::VPtrStealingHack);
    JSGlobalData::jsByteArrayVPtr = jsByteArray->vptr();
    jsByteArray->~JSCell();

    COMPILE_ASSERT(sizeof(JSString) <= sizeof(storage), sizeof_JSString_must_be_less_than_storage);
    JSCell* jsString = new (storage) JSString(JSString::VPtrStealingHack);
    JSGlobalData::jsStringVPtr = jsString->vptr();
    jsString->~JSCell();

    COMPILE_ASSERT(sizeof(JSFunction) <= sizeof(storage), sizeof_JSFunction_must_be_less_than_storage);
    char executableStorage[sizeof(VPtrHackExecutable)];
    RefPtr<Structure> executableStructure = Structure::create(Structure::VPtrStealingHack, 0);
    JSCell* executable = new (executableStorage) VPtrHackExecutable(executableStructure.get());
    JSCell* jsFunction = new (storage) JSFunction(Structure::create(Structure::VPtrStealingHack, &JSFunction::s_info), static_cast<VPtrHackExecutable*>(executable));
    JSGlobalData::jsFunctionVPtr = jsFunction->vptr();
    executable->~JSCell();
    jsFunction->~JSCell();
}

예제 #4

파일: JSGlobalData.cpp 프로젝트: Mr-Kumar-Abhishek/qt

VPtrSet::VPtrSet()
{
    // Bizarrely, calling fastMalloc here is faster than allocating space on the stack.
    void* storage = fastMalloc(sizeof(CollectorBlock));

    JSCell* jsArray = new (storage) JSArray(JSArray::createStructure(jsNull()));
    jsArrayVPtr = jsArray->vptr();
    jsArray->~JSCell();

    JSCell* jsByteArray = new (storage) JSByteArray(JSByteArray::VPtrStealingHack);
    jsByteArrayVPtr = jsByteArray->vptr();
    jsByteArray->~JSCell();

    JSCell* jsString = new (storage) JSString(JSString::VPtrStealingHack);
    jsStringVPtr = jsString->vptr();
    jsString->~JSCell();

    JSCell* jsFunction = new (storage) JSFunction(JSFunction::createStructure(jsNull()));
    jsFunctionVPtr = jsFunction->vptr();
    jsFunction->~JSCell();

    fastFree(storage);
}