Source/bindings/v8/V8Binding.cpp

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
throwError
throwError
throwTypeError
throwArityTypeErrorForMethod
throwArityTypeErrorForConstructor
throwArityTypeError
Allocate
AllocateUninitialized
Free
v8ArrayBufferAllocator
toNodeFilter
enforceRange
toSmallerInt
toSmallerUInt
toInt8
toInt8
toUInt8
toUInt8
toInt16
toInt16
toUInt16
toUInt16
toInt32
toInt32
toUInt32
toUInt32
toInt64
toInt64
toUInt64
toUInt64
toFloat
toXPathNSResolver
toDOMWindow
toDOMWindow
enteredDOMWindow
currentDOMWindow
callingDOMWindow
toExecutionContext
currentExecutionContext
callingExecutionContext
toFrameIfNotDetached
toV8Context
toV8Context
handleMaxRecursionDepthExceeded
crashIfV8IsDead
getBoundFunction
addHiddenValueToArray
removeHiddenValueFromArray
moveEventListenerToNewWrapper
toIsolate
toIsolate
create
m_scriptState
/*
 * Copyright (C) 2006, 2007, 2008, 2009 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
 * OWNER OR 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.
 */

#include "config.h"
#include "bindings/v8/V8Binding.h"

#include "V8Element.h"
#include "V8NodeFilter.h"
#include "V8Window.h"
#include "V8WorkerGlobalScope.h"
#include "V8XPathNSResolver.h"
#include "bindings/v8/ScriptController.h"
#include "bindings/v8/V8AbstractEventListener.h"
#include "bindings/v8/V8BindingMacros.h"
#include "bindings/v8/V8NodeFilterCondition.h"
#include "bindings/v8/V8ObjectConstructor.h"
#include "bindings/v8/V8WindowShell.h"
#include "bindings/v8/WorkerScriptController.h"
#include "bindings/v8/custom/V8CustomXPathNSResolver.h"
#include "core/dom/Element.h"
#include "core/dom/NodeFilter.h"
#include "core/dom/QualifiedName.h"
#include "core/frame/LocalFrame.h"
#include "core/frame/Settings.h"
#include "core/inspector/BindingVisitors.h"
#include "core/loader/FrameLoader.h"
#include "core/loader/FrameLoaderClient.h"
#include "core/workers/WorkerGlobalScope.h"
#include "core/xml/XPathNSResolver.h"
#include "wtf/ArrayBufferContents.h"
#include "wtf/MainThread.h"
#include "wtf/MathExtras.h"
#include "wtf/StdLibExtras.h"
#include "wtf/Threading.h"
#include "wtf/text/AtomicString.h"
#include "wtf/text/CString.h"
#include "wtf/text/StringBuffer.h"
#include "wtf/text/StringHash.h"
#include "wtf/text/WTFString.h"

namespace WebCore {

v8::Handle<v8::Value> throwError(V8ErrorType errorType, const String& message, v8::Isolate* isolate)
{
    return V8ThrowException::throwError(errorType, message, isolate);
}

v8::Handle<v8::Value> throwError(v8::Handle<v8::Value> exception, v8::Isolate* isolate)
{
    return V8ThrowException::throwError(exception, isolate);
}

v8::Handle<v8::Value> throwTypeError(const String& message, v8::Isolate* isolate)
{
    return V8ThrowException::throwTypeError(message, isolate);
}

void throwArityTypeErrorForMethod(const char* method, const char* type, unsigned expected, unsigned providedLeastNumMandatoryParams, v8::Isolate* isolate)
{
    throwTypeError(ExceptionMessages::failedToExecute(method, type, ExceptionMessages::notEnoughArguments(expected, providedLeastNumMandatoryParams)), isolate);
}

void throwArityTypeErrorForConstructor(const char* type, unsigned expected, unsigned providedLeastNumMandatoryParams, v8::Isolate* isolate)
{
    throwTypeError(ExceptionMessages::failedToConstruct(type, ExceptionMessages::notEnoughArguments(expected, providedLeastNumMandatoryParams)), isolate);
}

void throwArityTypeError(ExceptionState& exceptionState, unsigned expected, unsigned providedLeastNumMandatoryParams)
{
    exceptionState.throwTypeError(ExceptionMessages::notEnoughArguments(expected, providedLeastNumMandatoryParams));
    exceptionState.throwIfNeeded();
}

class ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
    virtual void* Allocate(size_t size) OVERRIDE
    {
        void* data;
        WTF::ArrayBufferContents::allocateMemory(size, WTF::ArrayBufferContents::ZeroInitialize, data);
        return data;
    }

    virtual void* AllocateUninitialized(size_t size) OVERRIDE
    {
        void* data;
        WTF::ArrayBufferContents::allocateMemory(size, WTF::ArrayBufferContents::DontInitialize, data);
        return data;
    }

    virtual void Free(void* data, size_t size) OVERRIDE
    {
        WTF::ArrayBufferContents::freeMemory(data, size);
    }
};

v8::ArrayBuffer::Allocator* v8ArrayBufferAllocator()
{
    DEFINE_STATIC_LOCAL(ArrayBufferAllocator, arrayBufferAllocator, ());
    return &arrayBufferAllocator;
}

PassRefPtr<NodeFilter> toNodeFilter(v8::Handle<v8::Value> callback, v8::Isolate* isolate)
{
    RefPtr<NodeFilter> filter = NodeFilter::create();

    // FIXME: Should pass in appropriate creationContext
    v8::Handle<v8::Object> filterWrapper = toV8(filter, v8::Handle<v8::Object>(), isolate).As<v8::Object>();

    RefPtr<NodeFilterCondition> condition = V8NodeFilterCondition::create(callback, filterWrapper, isolate);
    filter->setCondition(condition.release());

    return filter.release();
}

const int32_t kMaxInt32 = 0x7fffffff;
const int32_t kMinInt32 = -kMaxInt32 - 1;
const uint32_t kMaxUInt32 = 0xffffffff;
const int64_t kJSMaxInteger = 0x20000000000000LL - 1; // 2^53 - 1, maximum uniquely representable integer in ECMAScript.

static double enforceRange(double x, double minimum, double maximum, const char* typeName, ExceptionState& exceptionState)
{
    if (std::isnan(x) || std::isinf(x)) {
        exceptionState.throwTypeError("Value is" + String(std::isinf(x) ? " infinite and" : "") + " not of type '" + String(typeName) + "'.");
        return 0;
    }
    x = trunc(x);
    if (x < minimum || x > maximum) {
        exceptionState.throwTypeError("Value is outside the '" + String(typeName) + "' value range.");
        return 0;
    }
    return x;
}

template <typename T>
struct IntTypeLimits {
};

template <>
struct IntTypeLimits<int8_t> {
    static const int8_t minValue = -128;
    static const int8_t maxValue = 127;
    static const unsigned numberOfValues = 256; // 2^8
};

template <>
struct IntTypeLimits<uint8_t> {
    static const uint8_t maxValue = 255;
    static const unsigned numberOfValues = 256; // 2^8
};

template <>
struct IntTypeLimits<int16_t> {
    static const short minValue = -32768;
    static const short maxValue = 32767;
    static const unsigned numberOfValues = 65536; // 2^16
};

template <>
struct IntTypeLimits<uint16_t> {
    static const unsigned short maxValue = 65535;
    static const unsigned numberOfValues = 65536; // 2^16
};

template <typename T>
static inline T toSmallerInt(v8::Handle<v8::Value> value, IntegerConversionConfiguration configuration, const char* typeName, ExceptionState& exceptionState)
{
    typedef IntTypeLimits<T> LimitsTrait;

    // Fast case. The value is already a 32-bit integer in the right range.
    if (value->IsInt32()) {
        int32_t result = value->Int32Value();
        if (result >= LimitsTrait::minValue && result <= LimitsTrait::maxValue)
            return static_cast<T>(result);
        if (configuration == EnforceRange) {
            exceptionState.throwTypeError("Value is outside the '" + String(typeName) + "' value range.");
            return 0;
        }
        result %= LimitsTrait::numberOfValues;
        return static_cast<T>(result > LimitsTrait::maxValue ? result - LimitsTrait::numberOfValues : result);
    }

    // Can the value be converted to a number?
    V8TRYCATCH_EXCEPTION_RETURN(v8::Local<v8::Number>, numberObject, value->ToNumber(), exceptionState, 0);
    if (numberObject.IsEmpty()) {
        exceptionState.throwTypeError("Not convertible to a number value (of type '" + String(typeName) + "'.");
        return 0;
    }

    if (configuration == EnforceRange)
        return enforceRange(numberObject->Value(), LimitsTrait::minValue, LimitsTrait::maxValue, typeName, exceptionState);

    double numberValue = numberObject->Value();
    if (std::isnan(numberValue) || std::isinf(numberValue) || !numberValue)
        return 0;

    numberValue = numberValue < 0 ? -floor(fabs(numberValue)) : floor(fabs(numberValue));
    numberValue = fmod(numberValue, LimitsTrait::numberOfValues);

    return static_cast<T>(numberValue > LimitsTrait::maxValue ? numberValue - LimitsTrait::numberOfValues : numberValue);
}

template <typename T>
static inline T toSmallerUInt(v8::Handle<v8::Value> value, IntegerConversionConfiguration configuration, const char* typeName, ExceptionState& exceptionState)
{
    typedef IntTypeLimits<T> LimitsTrait;

    // Fast case. The value is a 32-bit signed integer - possibly positive?
    if (value->IsInt32()) {
        int32_t result = value->Int32Value();
        if (result >= 0 && result <= LimitsTrait::maxValue)
            return static_cast<T>(result);
        if (configuration == EnforceRange) {
            exceptionState.throwTypeError("Value is outside the '" + String(typeName) + "' value range.");
            return 0;
        }
        return static_cast<T>(result);
    }

    // Can the value be converted to a number?
    V8TRYCATCH_EXCEPTION_RETURN(v8::Local<v8::Number>, numberObject, value->ToNumber(), exceptionState, 0);
    if (numberObject.IsEmpty()) {
        exceptionState.throwTypeError("Not convertible to a number value (of type '" + String(typeName) + "'.");
        return 0;
    }

    if (configuration == EnforceRange)
        return enforceRange(numberObject->Value(), 0, LimitsTrait::maxValue, typeName, exceptionState);

    // Does the value convert to nan or to an infinity?
    double numberValue = numberObject->Value();
    if (std::isnan(numberValue) || std::isinf(numberValue) || !numberValue)
        return 0;

    if (configuration == Clamp)
        return clampTo<T>(numberObject->Value());

    numberValue = numberValue < 0 ? -floor(fabs(numberValue)) : floor(fabs(numberValue));
    return static_cast<T>(fmod(numberValue, LimitsTrait::numberOfValues));
}

int8_t toInt8(v8::Handle<v8::Value> value, IntegerConversionConfiguration configuration, ExceptionState& exceptionState)
{
    return toSmallerInt<int8_t>(value, configuration, "byte", exceptionState);
}

int8_t toInt8(v8::Handle<v8::Value> value)
{
    NonThrowableExceptionState exceptionState;
    return toInt8(value, NormalConversion, exceptionState);
}

uint8_t toUInt8(v8::Handle<v8::Value> value, IntegerConversionConfiguration configuration, ExceptionState& exceptionState)
{
    return toSmallerUInt<uint8_t>(value, configuration, "octet", exceptionState);
}

uint8_t toUInt8(v8::Handle<v8::Value> value)
{
    NonThrowableExceptionState exceptionState;
    return toUInt8(value, NormalConversion, exceptionState);
}

int16_t toInt16(v8::Handle<v8::Value> value, IntegerConversionConfiguration configuration, ExceptionState& exceptionState)
{
    return toSmallerInt<int16_t>(value, configuration, "short", exceptionState);
}

int16_t toInt16(v8::Handle<v8::Value> value)
{
    NonThrowableExceptionState exceptionState;
    return toInt16(value, NormalConversion, exceptionState);
}

uint16_t toUInt16(v8::Handle<v8::Value> value, IntegerConversionConfiguration configuration, ExceptionState& exceptionState)
{
    return toSmallerUInt<uint16_t>(value, configuration, "unsigned short", exceptionState);
}

uint16_t toUInt16(v8::Handle<v8::Value> value)
{
    NonThrowableExceptionState exceptionState;
    return toUInt16(value, NormalConversion, exceptionState);
}

int32_t toInt32(v8::Handle<v8::Value> value, IntegerConversionConfiguration configuration, ExceptionState& exceptionState)
{
    // Fast case. The value is already a 32-bit integer.
    if (value->IsInt32())
        return value->Int32Value();

    // Can the value be converted to a number?
    V8TRYCATCH_EXCEPTION_RETURN(v8::Local<v8::Number>, numberObject, value->ToNumber(), exceptionState, 0);
    if (numberObject.IsEmpty()) {
        exceptionState.throwTypeError("Not convertible to a number value (of type 'long'.)");
        return 0;
    }

    if (configuration == EnforceRange)
        return enforceRange(numberObject->Value(), kMinInt32, kMaxInt32, "long", exceptionState);

    // Does the value convert to nan or to an infinity?
    double numberValue = numberObject->Value();
    if (std::isnan(numberValue) || std::isinf(numberValue))
        return 0;

    if (configuration == Clamp)
        return clampTo<int32_t>(numberObject->Value());

    V8TRYCATCH_EXCEPTION_RETURN(int32_t, result, numberObject->Int32Value(), exceptionState, 0);
    return result;
}

int32_t toInt32(v8::Handle<v8::Value> value)
{
    NonThrowableExceptionState exceptionState;
    return toInt32(value, NormalConversion, exceptionState);
}

uint32_t toUInt32(v8::Handle<v8::Value> value, IntegerConversionConfiguration configuration, ExceptionState& exceptionState)
{
    // Fast case. The value is already a 32-bit unsigned integer.
    if (value->IsUint32())
        return value->Uint32Value();

    // Fast case. The value is a 32-bit signed integer - possibly positive?
    if (value->IsInt32()) {
        int32_t result = value->Int32Value();
        if (result >= 0)
            return result;
        if (configuration == EnforceRange) {
            exceptionState.throwTypeError("Value is outside the 'unsigned long' value range.");
            return 0;
        }
        return result;
    }

    // Can the value be converted to a number?
    V8TRYCATCH_EXCEPTION_RETURN(v8::Local<v8::Number>, numberObject, value->ToNumber(), exceptionState, 0);
    if (numberObject.IsEmpty()) {
        exceptionState.throwTypeError("Not convertible to a number value (of type 'unsigned long'.)");
        return 0;
    }

    if (configuration == EnforceRange)
        return enforceRange(numberObject->Value(), 0, kMaxUInt32, "unsigned long", exceptionState);

    // Does the value convert to nan or to an infinity?
    double numberValue = numberObject->Value();
    if (std::isnan(numberValue) || std::isinf(numberValue))
        return 0;

    if (configuration == Clamp)
        return clampTo<uint32_t>(numberObject->Value());

    V8TRYCATCH_RETURN(uint32_t, result, numberObject->Uint32Value(), 0);
    return result;
}

uint32_t toUInt32(v8::Handle<v8::Value> value)
{
    NonThrowableExceptionState exceptionState;
    return toUInt32(value, NormalConversion, exceptionState);
}

int64_t toInt64(v8::Handle<v8::Value> value, IntegerConversionConfiguration configuration, ExceptionState& exceptionState)
{
    // Fast case. The value is a 32-bit integer.
    if (value->IsInt32())
        return value->Int32Value();

    // Can the value be converted to a number?
    V8TRYCATCH_EXCEPTION_RETURN(v8::Local<v8::Number>, numberObject, value->ToNumber(), exceptionState, 0);
    if (numberObject.IsEmpty()) {
        exceptionState.throwTypeError("Not convertible to a number value (of type 'long long'.)");
        return 0;
    }

    double x = numberObject->Value();

    if (configuration == EnforceRange)
        return enforceRange(x, -kJSMaxInteger, kJSMaxInteger, "long long", exceptionState);

    // Does the value convert to nan or to an infinity?
    if (std::isnan(x) || std::isinf(x))
        return 0;

    // NaNs and +/-Infinity should be 0, otherwise modulo 2^64.
    unsigned long long integer;
    doubleToInteger(x, integer);
    return integer;
}

int64_t toInt64(v8::Handle<v8::Value> value)
{
    NonThrowableExceptionState exceptionState;
    return toInt64(value, NormalConversion, exceptionState);
}

uint64_t toUInt64(v8::Handle<v8::Value> value, IntegerConversionConfiguration configuration, ExceptionState& exceptionState)
{
    // Fast case. The value is a 32-bit unsigned integer.
    if (value->IsUint32())
        return value->Uint32Value();

    // Fast case. The value is a 32-bit integer.
    if (value->IsInt32()) {
        int32_t result = value->Int32Value();
        if (result >= 0)
            return result;
        if (configuration == EnforceRange) {
            exceptionState.throwTypeError("Value is outside the 'unsigned long long' value range.");
            return 0;
        }
        return result;
    }

    // Can the value be converted to a number?
    V8TRYCATCH_EXCEPTION_RETURN(v8::Local<v8::Number>, numberObject, value->ToNumber(), exceptionState, 0);
    if (numberObject.IsEmpty()) {
        exceptionState.throwTypeError("Not convertible to a number value (of type 'unsigned long long'.)");
        return 0;
    }

    double x = numberObject->Value();

    if (configuration == EnforceRange)
        return enforceRange(x, 0, kJSMaxInteger, "unsigned long long", exceptionState);

    // Does the value convert to nan or to an infinity?
    if (std::isnan(x) || std::isinf(x))
        return 0;

    // NaNs and +/-Infinity should be 0, otherwise modulo 2^64.
    unsigned long long integer;
    doubleToInteger(x, integer);
    return integer;
}

uint64_t toUInt64(v8::Handle<v8::Value> value)
{
    NonThrowableExceptionState exceptionState;
    return toUInt64(value, NormalConversion, exceptionState);
}

float toFloat(v8::Handle<v8::Value> value, ExceptionState& exceptionState)
{
    V8TRYCATCH_EXCEPTION_RETURN(v8::Local<v8::Number>, numberObject, value->ToNumber(), exceptionState, 0);
    return numberObject->NumberValue();
}

PassRefPtrWillBeRawPtr<XPathNSResolver> toXPathNSResolver(v8::Handle<v8::Value> value, v8::Isolate* isolate)
{
    RefPtrWillBeRawPtr<XPathNSResolver> resolver = nullptr;
    if (V8XPathNSResolver::hasInstance(value, isolate))
        resolver = V8XPathNSResolver::toNative(v8::Handle<v8::Object>::Cast(value));
    else if (value->IsObject())
        resolver = V8CustomXPathNSResolver::create(value->ToObject(), isolate);
    return resolver;
}

DOMWindow* toDOMWindow(v8::Handle<v8::Value> value, v8::Isolate* isolate)
{
    if (value.IsEmpty() || !value->IsObject())
        return 0;

    v8::Handle<v8::Object> windowWrapper = V8Window::findInstanceInPrototypeChain(v8::Handle<v8::Object>::Cast(value), isolate);
    if (!windowWrapper.IsEmpty())
        return V8Window::toNative(windowWrapper);
    return 0;
}

DOMWindow* toDOMWindow(v8::Handle<v8::Context> context)
{
    if (context.IsEmpty())
        return 0;
    return toDOMWindow(context->Global(), context->GetIsolate());
}

DOMWindow* enteredDOMWindow(v8::Isolate* isolate)
{
    return toDOMWindow(isolate->GetEnteredContext());
}

DOMWindow* currentDOMWindow(v8::Isolate* isolate)
{
    return toDOMWindow(isolate->GetCurrentContext());
}

DOMWindow* callingDOMWindow(v8::Isolate* isolate)
{
    v8::Handle<v8::Context> context = isolate->GetCallingContext();
    if (context.IsEmpty()) {
        // Unfortunately, when processing script from a plug-in, we might not
        // have a calling context. In those cases, we fall back to the
        // entered context.
        context = isolate->GetEnteredContext();
    }
    return toDOMWindow(context);
}

ExecutionContext* toExecutionContext(v8::Handle<v8::Context> context)
{
    v8::Handle<v8::Object> global = context->Global();
    v8::Handle<v8::Object> windowWrapper = V8Window::findInstanceInPrototypeChain(global, context->GetIsolate());
    if (!windowWrapper.IsEmpty())
        return V8Window::toNative(windowWrapper)->executionContext();
    v8::Handle<v8::Object> workerWrapper = V8WorkerGlobalScope::findInstanceInPrototypeChain(global, context->GetIsolate());
    if (!workerWrapper.IsEmpty())
        return V8WorkerGlobalScope::toNative(workerWrapper)->executionContext();
    // FIXME: Is this line of code reachable?
    return 0;
}

ExecutionContext* currentExecutionContext(v8::Isolate* isolate)
{
    return toExecutionContext(isolate->GetCurrentContext());
}

ExecutionContext* callingExecutionContext(v8::Isolate* isolate)
{
    v8::Handle<v8::Context> context = isolate->GetCallingContext();
    if (context.IsEmpty()) {
        // Unfortunately, when processing script from a plug-in, we might not
        // have a calling context. In those cases, we fall back to the
        // entered context.
        context = isolate->GetEnteredContext();
    }
    return toExecutionContext(context);
}

LocalFrame* toFrameIfNotDetached(v8::Handle<v8::Context> context)
{
    DOMWindow* window = toDOMWindow(context);
    if (window && window->isCurrentlyDisplayedInFrame())
        return window->frame();
    // We return 0 here because |context| is detached from the LocalFrame. If we
    // did return |frame| we could get in trouble because the frame could be
    // navigated to another security origin.
    return 0;
}

v8::Local<v8::Context> toV8Context(ExecutionContext* context, DOMWrapperWorld& world)
{
    ASSERT(context);
    if (context->isDocument()) {
        if (LocalFrame* frame = toDocument(context)->frame())
            return frame->script().windowShell(world)->context();
    } else if (context->isWorkerGlobalScope()) {
        if (WorkerScriptController* script = toWorkerGlobalScope(context)->script())
            return script->context();
    }
    return v8::Local<v8::Context>();
}

v8::Local<v8::Context> toV8Context(v8::Isolate* isolate, LocalFrame* frame, DOMWrapperWorld& world)
{
    if (!frame)
        return v8::Local<v8::Context>();
    v8::Local<v8::Context> context = frame->script().windowShell(world)->context();
    if (context.IsEmpty())
        return v8::Local<v8::Context>();
    LocalFrame* attachedFrame= toFrameIfNotDetached(context);
    return frame == attachedFrame ? context : v8::Local<v8::Context>();
}

v8::Local<v8::Value> handleMaxRecursionDepthExceeded(v8::Isolate* isolate)
{
    throwError(v8RangeError, "Maximum call stack size exceeded.", isolate);
    return v8::Local<v8::Value>();
}

void crashIfV8IsDead()
{
    if (v8::V8::IsDead()) {
        // FIXME: We temporarily deal with V8 internal error situations
        // such as out-of-memory by crashing the renderer.
        CRASH();
    }
}

v8::Handle<v8::Function> getBoundFunction(v8::Handle<v8::Function> function)
{
    v8::Handle<v8::Value> boundFunction = function->GetBoundFunction();
    return boundFunction->IsFunction() ? v8::Handle<v8::Function>::Cast(boundFunction) : function;
}

void addHiddenValueToArray(v8::Handle<v8::Object> object, v8::Local<v8::Value> value, int arrayIndex, v8::Isolate* isolate)
{
    v8::Local<v8::Value> arrayValue = object->GetInternalField(arrayIndex);
    if (arrayValue->IsNull() || arrayValue->IsUndefined()) {
        arrayValue = v8::Array::New(isolate);
        object->SetInternalField(arrayIndex, arrayValue);
    }

    v8::Local<v8::Array> array = v8::Local<v8::Array>::Cast(arrayValue);
    array->Set(v8::Integer::New(isolate, array->Length()), value);
}

void removeHiddenValueFromArray(v8::Handle<v8::Object> object, v8::Local<v8::Value> value, int arrayIndex, v8::Isolate* isolate)
{
    v8::Local<v8::Value> arrayValue = object->GetInternalField(arrayIndex);
    if (!arrayValue->IsArray())
        return;
    v8::Local<v8::Array> array = v8::Local<v8::Array>::Cast(arrayValue);
    for (int i = array->Length() - 1; i >= 0; --i) {
        v8::Local<v8::Value> item = array->Get(v8::Integer::New(isolate, i));
        if (item->StrictEquals(value)) {
            array->Delete(i);
            return;
        }
    }
}

void moveEventListenerToNewWrapper(v8::Handle<v8::Object> object, EventListener* oldValue, v8::Local<v8::Value> newValue, int arrayIndex, v8::Isolate* isolate)
{
    if (oldValue) {
        V8AbstractEventListener* oldListener = V8AbstractEventListener::cast(oldValue);
        if (oldListener) {
            v8::Local<v8::Object> oldListenerObject = oldListener->getExistingListenerObject();
            if (!oldListenerObject.IsEmpty())
                removeHiddenValueFromArray(object, oldListenerObject, arrayIndex, isolate);
        }
    }
    // Non-callable input is treated as null and ignored
    if (newValue->IsFunction())
        addHiddenValueToArray(object, newValue, arrayIndex, isolate);
}

v8::Isolate* toIsolate(ExecutionContext* context)
{
    if (context && context->isDocument())
        return V8PerIsolateData::mainThreadIsolate();
    return v8::Isolate::GetCurrent();
}

v8::Isolate* toIsolate(LocalFrame* frame)
{
    ASSERT(frame);
    return frame->script().isolate();
}

PassOwnPtr<V8ExecutionScope> V8ExecutionScope::create(v8::Isolate* isolate)
{
    return adoptPtr(new V8ExecutionScope(isolate));
}

V8ExecutionScope::V8ExecutionScope(v8::Isolate* isolate)
    : m_handleScope(isolate)
    , m_contextScope(v8::Context::New(isolate))
    , m_scriptState(NewScriptState::create(isolate->GetCurrentContext(), DOMWrapperWorld::create()))
{
}

} // namespace WebCore
/* [<][>][^][v][top][bottom][index][help] */
root/Source/bindings/v8/V8Binding.cpp

DEFINITIONS
