Added Dartium changes onto 45.0.2454.104

Source/bindings/core/dart/DartUtilities.cpp

+// Copyright 2011, 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/core/dart/DartUtilities.h"
+
+#if OS(ANDROID)
+#include <sys/system_properties.h>
+#endif
+
+#include "core/FetchInitiatorTypeNames.h"
+#include "bindings/core/dart/DartController.h"
+#include "bindings/core/dart/DartDOMData.h"
+#include "bindings/core/dart/DartScriptDebugServer.h"
+#include "bindings/core/dart/DartScriptState.h"
+#include "bindings/core/dart/V8Converter.h"
+#include "bindings/core/v8/ScriptController.h"
+#include "bindings/core/v8/SerializedScriptValue.h"
+#include "bindings/core/v8/V8Binding.h"
+#include "bindings/core/v8/V8ExceptionState.h"
+#include "bindings/core/v8/V8PerIsolateData.h"
+#include "core/dom/Document.h"
+#include "core/events/ErrorEvent.h"
+#include "core/fetch/ResourceFetcher.h"
+#include "core/frame/LocalDOMWindow.h"
+#include "core/frame/LocalFrame.h"
+#include "core/html/canvas/DataView.h"
+#include "core/inspector/ScriptArguments.h"
+#include "core/inspector/ScriptCallStack.h"
+#include "core/loader/FrameLoader.h"
+#include "modules/webdatabase/sqlite/SQLValue.h"
+#include "platform/SharedBuffer.h"
+#include "platform/network/ResourceRequest.h"
+
+#include "wtf/ArrayBufferView.h"
+#include "wtf/Float32Array.h"
+#include "wtf/Float64Array.h"
+#include "wtf/Int16Array.h"
+#include "wtf/Int32Array.h"
+#include "wtf/Int8Array.h"
+#include "wtf/RefCounted.h"
+#include "wtf/Uint16Array.h"
+#include "wtf/Uint32Array.h"
+#include "wtf/Uint8Array.h"
+#include "wtf/Uint8ClampedArray.h"
+#include "wtf/text/AtomicString.h"
+#include "wtf/text/CString.h"
+#include "wtf/text/WTFString.h"
+
+namespace blink {
+
+V8Scope::V8Scope(DartDOMData* dartDOMData, v8::Handle<v8::Context> context)
+    : m_v8Isolate(v8::Isolate::GetCurrent())
+    , m_dartDOMData(dartDOMData)
+    , m_handleScope(m_v8Isolate)
+    , m_contextScope(context)
+    , m_recursionScope(m_v8Isolate)
+{
+    if (m_dartDOMData)
+        (*m_dartDOMData->recursion())++;
+}
+
+V8Scope::V8Scope(DartDOMData* dartDOMData)
+    : m_v8Isolate(v8::Isolate::GetCurrent())
+    , m_dartDOMData(dartDOMData)
+    , m_handleScope(m_v8Isolate)
+    , m_contextScope(DartUtilities::currentV8Context())
+    , m_recursionScope(m_v8Isolate)
+{
+    if (m_dartDOMData)
+        (*m_dartDOMData->recursion())++;
+}
+
+V8Scope::~V8Scope()
+{
+    if (m_dartDOMData)
+        (*m_dartDOMData->recursion())--;
+}
+
+DartStringPeer* DartStringPeer::nullString()
+{
+    DEFINE_STATIC_LOCAL(DartStringPeer, empty, ());
+    return &empty;
+}
+
+DartStringPeer* DartStringPeer::emptyString()
+{
+    DEFINE_STATIC_LOCAL(DartStringPeer, empty, (StringImpl::empty()));
+    return &empty;
+}
+
+
+static void stringFinalizer(void* peer)
+{
+    ASSERT(reinterpret_cast<DartStringPeer*>(peer) != DartStringPeer::nullString());
+    delete reinterpret_cast<DartStringPeer*>(peer);
+}
+
+template <typename T> DartStringPeer* convertAndExternalize(Dart_Handle string, intptr_t length)
+{
+    if (!length)
+        return new DartStringPeer(StringImpl::empty());
+#ifndef NDEBUG
+    {
+        intptr_t storageSize = 0;
+        Dart_StringStorageSize(string, &storageSize);
+        ASSERT(length * intptr_t(sizeof(T)) == storageSize);
+    }
+#endif
+    T* buffer = 0;
+    DartStringPeer* peer = new DartStringPeer(StringImpl::createUninitialized(length, buffer));
+    Dart_Handle ALLOW_UNUSED r = Dart_MakeExternalString(string, buffer, length * sizeof(T), peer, stringFinalizer);
+    ASSERT(!Dart_IsError(r));
+    return peer;
+}
+
+DartStringPeer* DartUtilities::toStringImpl(Dart_Handle object, intptr_t charsize, intptr_t strlength)
+{
+    ASSERT(Dart_IsString(object) && !Dart_IsExternalString(object));
+    return (charsize == 1) ? convertAndExternalize<LChar>(object, strlength) : convertAndExternalize<UChar>(object, strlength);
+}
+
+
+Dart_Handle DartUtilities::stringImplToDartString(StringImpl* stringImpl)
+{
+    if (!stringImpl) {
+        DartDOMData* domData = DartDOMData::current();
+        return domData->emptyString();
+    }
+
+    DartStringPeer* peer = new DartStringPeer(stringImpl);
+    if (stringImpl->is8Bit()) {
+        // FIXME: maybe it makes sense only externalize strings longer than certain threshold, such as 5 symbols.
+        return Dart_NewExternalLatin1String(reinterpret_cast<const uint8_t*>(stringImpl->characters8()),
+            stringImpl->length(), peer, stringFinalizer);
+    } else {
+        // FIXME: maybe it makes sense only externalize strings longer than certain threshold, such as 5 symbols.
+        return Dart_NewExternalUTF16String(reinterpret_cast<const uint16_t*>(stringImpl->characters16()),
+            stringImpl->length(), peer, stringFinalizer);
+    }
+}
+
+Dart_Handle DartUtilities::stringToDartString(const String& str)
+{
+    return stringImplToDartString(str.impl());
+}
+
+Dart_Handle DartUtilities::stringToDartString(const AtomicString& str)
+{
+    return stringImplToDartString(str.impl());
+}
+
+
+Dart_Handle DartUtilities::safeStringImplToDartString(StringImpl* stringImpl)
+{
+    if (!stringImpl) {
+        DartDOMData* domData = DartDOMData::current();
+        return domData->emptyString();
+    }
+
+    if (stringImpl->is8Bit()) {
+        return Dart_NewStringFromUTF8(
+            reinterpret_cast<const uint8_t*>(stringImpl->characters8()),
+            stringImpl->length());
+    } else {
+        return Dart_NewStringFromUTF16(
+            reinterpret_cast<const uint16_t*>(stringImpl->characters16()),
+            stringImpl->length());
+    }
+}
+
+Dart_Handle DartUtilities::safeStringToDartString(const String& str)
+{
+    return safeStringImplToDartString(str.impl());
+}
+
+Dart_Handle DartUtilities::safeStringToDartString(const AtomicString& str)
+{
+    return safeStringImplToDartString(str.impl());
+}
+
+template <typename Trait>
+typename Trait::nativeType convert(Dart_Handle object, Dart_Handle& exception)
+{
+    typename Trait::nativeType value;
+    Dart_Handle result = Trait::convert(object, &value);
+    if (Dart_IsError(result)) {
+        exception = Dart_NewStringFromCString(Dart_GetError(result));
+        return typename Trait::nativeType();
+    }
+    return value;
+}
+
+struct IntegerTrait {
+    typedef int64_t nativeType;
+    static Dart_Handle convert(Dart_Handle object, int64_t* value)
+    {
+        return Dart_IntegerToInt64(object, value);
+        // FIXME: support bigints.
+    }
+};
+
+int64_t DartUtilities::toInteger(Dart_Handle object, Dart_Handle& exception)
+{
+    return convert<IntegerTrait>(object, exception);
+}
+
+String DartUtilities::toString(Dart_Handle object)
+{
+    Dart_Handle exception = 0;
+    String string = dartToString(object, exception);
+    ASSERT(!exception);
+    return string;
+}
+
+struct DoubleTrait {
+    typedef double nativeType;
+    static Dart_Handle convert(Dart_Handle object, double* value)
+    {
+        if (Dart_IsDouble(object))
+            return Dart_DoubleValue(object, value);
+
+        if (Dart_IsInteger(object)) {
+            int64_t v = 0;
+            Dart_Handle result = Dart_IntegerToInt64(object, &v);
+            if (!Dart_IsError(result)) {
+                *value = static_cast<double>(v);
+                return result;
+            }
+        }
+
+        if (Dart_IsNumber(object)) {
+            object = Dart_Invoke(object, Dart_NewStringFromCString("toDouble"), 0, 0);
+            if (Dart_IsError(object))
+                return object;
+        }
+
+        // For non-Number objects, use the error message returned by Dart_DoubleValue.
+        return Dart_DoubleValue(object, value);
+    }
+};
+
+double DartUtilities::dartToDouble(Dart_Handle object, Dart_Handle& exception)
+{
+    return convert<DoubleTrait>(object, exception);
+}
+
+struct BoolTrait {
+    typedef bool nativeType;
+    static Dart_Handle convert(Dart_Handle object, bool* value)
+    {
+        if (Dart_IsNull(object)) {
+            *value = false;
+            return Dart_Null();
+        }
+        return Dart_BooleanValue(object, value);
+    }
+};
+
+bool DartUtilities::dartToBool(Dart_Handle object, Dart_Handle& exception)
+{
+    return convert<BoolTrait>(object, exception);
+}
+
+DartStringAdapter DartUtilities::dartToStringImpl(Dart_Handle object, Dart_Handle& exception, bool autoDartScope)
+{
+    if (!Dart_IsError(object) && !Dart_IsNull(object)) {
+        ASSERT(Dart_IsString(object) && !Dart_IsExternalString(object));
+        intptr_t charsize = Dart_IsStringLatin1(object) ? 1 : 2;
+        intptr_t strlength;
+        Dart_StringLength(object, &strlength);
+        if (autoDartScope)
+            return DartStringAdapter(toStringImpl(object, charsize, strlength));
+        DartApiScope apiScope;
+        return DartStringAdapter(toStringImpl(object, charsize, strlength));
+    }
+    if (!autoDartScope) {
+        DartApiScope apiScope;
+        DartDOMData* domData = DartDOMData::current();
+        Dart_Handle excp = Dart_NewStringFromCString("String expected");
+        Dart_SetPersistentHandle(domData->currentException(), excp);
+        exception = domData->currentException();
+    } else {
+        exception = Dart_NewStringFromCString("String expected");
+    }
+    return DartStringAdapter(DartStringPeer::nullString());
+}
+
+void DartUtilities::extractMapElements(Dart_Handle map, Dart_Handle& exception, HashMap<String, Dart_Handle>& elements)
+{
+    ASSERT(elements.isEmpty());
+    Dart_Handle list = DartUtilities::invokeUtilsMethod("convertMapToList", 1, &map);
+    if (!DartUtilities::checkResult(list, exception))
+        return;
+    ASSERT(Dart_IsList(list));
+
+    intptr_t length = 0;
+    Dart_ListLength(list, &length);
+    ASSERT(length % 2 == 0);
+
+    for (intptr_t i = 0; i < length; i += 2) {
+        Dart_Handle key = Dart_ListGetAt(list, i);
+        ASSERT(!Dart_IsError(key) && Dart_IsString(key));
+        Dart_Handle value = Dart_ListGetAt(list, i+1);
+        ASSERT(!Dart_IsError(value));
+        String keyString = DartUtilities::dartToString(key, exception);
+        if (exception)
+            return;
+        elements.add(keyString, value);
+    }
+}
+
+Dart_Handle DartUtilities::toList(const Vector<Dart_Handle>& elements, Dart_Handle& exception)
+{
+    Dart_Handle ret = Dart_NewList(elements.size());
+    if (Dart_IsError(ret)) {
+        exception = ret;
+        return Dart_Null();
+    }
+    for (size_t i = 0; i < elements.size(); i++) {
+        Dart_ListSetAt(ret, i, elements[i]);
+    }
+    return ret;
+}
+
+void DartUtilities::extractListElements(Dart_Handle list, Dart_Handle& exception, Vector<Dart_Handle>& elements)
+{
+    ASSERT(elements.isEmpty());
+    list = DartUtilities::invokeUtilsMethod("convertToList", 1, &list);
+    if (!DartUtilities::checkResult(list, exception))
+        return;
+    ASSERT(Dart_IsList(list));
+
+    intptr_t length = 0;
+    Dart_ListLength(list, &length);
+    elements.reserveCapacity(length);
+    for (intptr_t i = 0; i < length; i++) {
+        Dart_Handle element = Dart_ListGetAt(list, i);
+        ASSERT(!Dart_IsError(element));
+        elements.append(element);
+    }
+}
+
+v8::Local<v8::Context> DartUtilities::currentV8Context()
+{
+    LocalFrame* frame = DartUtilities::domWindowForCurrentIsolate()->frame();
+    v8::Local<v8::Context> context = toV8Context(frame, DOMWrapperWorld::mainWorld());
+    ASSERT(!context.IsEmpty());
+    return context;
+}
+
+int DartUtilities::dartToInt(Dart_Handle object, Dart_Handle& exception)
+{
+    int64_t value = toInteger(object, exception);
+    if (exception)
+        return 0;
+    if (value < INT_MIN || value > INT_MAX) {
+        exception = Dart_NewStringFromCString("value out of range");
+        return 0;
+    }
+    return value;
+}
+
+unsigned DartUtilities::dartToUnsigned(Dart_Handle object, Dart_Handle& exception)
+{
+    int64_t value = toInteger(object, exception);
+    if (exception)
+        return 0;
+    if (value < 0 || value > UINT_MAX) {
+        exception = Dart_NewStringFromCString("value out of range");
+        return 0;
+    }
+    return value;
+}
+
+long long DartUtilities::dartToLongLong(Dart_Handle object, Dart_Handle& exception)
+{
+    // FIXME: proper processing of longer integer values.
+    return toInteger(object, exception);
+}
+
+unsigned long long DartUtilities::dartToUnsignedLongLong(Dart_Handle object, Dart_Handle& exception)
+{
+    // FIXME: proper processing of longer integer values.
+    int64_t value = toInteger(object, exception);
+    if (exception)
+        return 0;
+    if (value < 0) {
+        exception = Dart_NewStringFromCString("value out of range");
+        return 0;
+    }
+    return value;
+}
+
+Dart_Handle DartUtilities::numberToDart(double value)
+{
+    // JS can store integer values that are no greater than 2^53 - 1.
+    if (-kJSMaxInteger <= value && value <= kJSMaxInteger) {
+        int64_t intValue = static_cast<int64_t>(value);
+        if (value == intValue)
+            return intToDart(intValue);
+    }
+    return doubleToDart(value);
+}
+
+ScriptValue DartUtilities::dartToScriptValue(Dart_Handle object)
+{
+    return ScriptValue(DartScriptValue::create(currentScriptState(), object));
+}
+
+PassRefPtr<SerializedScriptValue> DartUtilities::toSerializedScriptValue(Dart_Handle value, MessagePortArray* ports, ArrayBufferArray* arrayBuffers, Dart_Handle& exception)
+{
+    v8::Handle<v8::Value> v8Value = V8Converter::toV8(value, exception);
+    if (exception)
+        return nullptr;
+
+    V8TrackExceptionState exceptionState;
+    RefPtr<SerializedScriptValue> message = SerializedScriptValue::create(v8Value, ports, arrayBuffers, exceptionState, v8::Isolate::GetCurrent());
+    if (exceptionState.hadException()) {
+        // FIXME: better exception here. We should match the exception v8 would throw.
+        exception = Dart_NewStringFromCString("Failed to create SerializedScriptValue");
+        return nullptr;
+    }
+
+    return message.release();
+}
+
+Dart_Handle DartUtilities::dateToDart(double date)
+{
+    Dart_Handle asDouble = DartUtilities::doubleToDart(date);
+    ASSERT(!Dart_IsError(asDouble));
+    return DartUtilities::invokeUtilsMethod("doubleToDateTime", 1, &asDouble);
+}
+
+double DartUtilities::dartToDate(Dart_Handle date, Dart_Handle& exception)
+{
+    Dart_Handle asDouble = DartUtilities::invokeUtilsMethod("dateTimeToDouble", 1, &date);
+    if (!DartUtilities::checkResult(asDouble, exception))
+        return 0.0;
+
+    return DartUtilities::dartToDouble(asDouble, exception);
+}
+
+double DartUtilities::dartToDate(Dart_NativeArguments args, int idx, Dart_Handle& exception)
+{
+    Dart_Handle object = Dart_GetNativeArgument(args, idx);
+    return dartToDate(object, exception);
+}
+
+bool DartUtilities::isDateTime(DartDOMData* domData, Dart_Handle handle)
+{
+    Dart_Handle dartType = DartUtilities::getDartType("dart:core", "DateTime");
+    return objectIsType(handle, dartType);
+}
+
+bool DartUtilities::objectIsType(Dart_Handle handle, Dart_Handle type)
+{
+    bool isType = false;
+    Dart_Handle result = Dart_ObjectIsType(handle, type, &isType);
+    if (Dart_IsError(result))
+        return false;
+    return isType;
+}
+
+bool DartUtilities::isTypeSubclassOf(Dart_Handle type, Dart_Handle library, const char* typeName)
+{
+    Dart_Handle other = Dart_GetType(library, Dart_NewStringFromCString(typeName), 0, 0);
+    ASSERT(!Dart_IsError(other));
+
+    Dart_Handle args[2] = { type, other };
+    Dart_Handle result = DartUtilities::invokeUtilsMethod("isTypeSubclassOf", 2, args);
+    if (Dart_IsError(result)) {
+        ASSERT_NOT_REACHED();
+        return false;
+    }
+
+    Dart_Handle exception = 0;
+    bool boolResult = dartToBool(result, exception);
+    if (exception)
+        return false;
+    return boolResult;
+}
+
+Dart_Handle DartUtilities::getAndValidateNativeType(Dart_Handle type, const String& tagName)
+{
+    Dart_Handle args[2] = { type, stringToDartString(tagName) };
+    Dart_Handle result = DartUtilities::invokeUtilsMethod("getAndValidateNativeType", 2, args);
+    ASSERT(!Dart_IsError(result));
+    if (Dart_IsError(result)) {
+        ASSERT_NOT_REACHED();
+        return Dart_Null();
+    }
+    return result;
+}
+
+bool DartUtilities::isFunction(DartDOMData* domData, Dart_Handle handle)
+{
+    return DartUtilities::objectIsType(handle, domData->functionType());
+}
+
+Dart_Handle DartUtilities::getDartType(const char* libraryName, const char* typeName)
+{
+    Dart_Handle library = Dart_LookupLibrary(Dart_NewStringFromCString(libraryName));
+    ASSERT(!Dart_IsError(library));
+
+    Dart_Handle dartType = Dart_GetType(library, Dart_NewStringFromCString(typeName), 0, 0);
+    ASSERT(!Dart_IsError(dartType));
+
+    return dartType;
+}
+
+Dart_Handle DartUtilities::getDartHtmlType(const char* typeName)
+{
+    Dart_Handle dartType = Dart_GetType(DartDOMData::current()->htmlLibrary(),
+        Dart_NewStringFromCString(typeName), 0, 0);
+    ASSERT(!Dart_IsError(dartType));
+
+    return dartType;
+}
+
+bool DartUtilities::isNode(Dart_Handle handle)
+{
+    Dart_Handle dartType = DartUtilities::getDartHtmlType("Node");
+    return objectIsType(handle, dartType);
+}
+
+Node* DartUtilities::dartNodeToNativeNode(void* value)
+{
+    return static_cast<Node*>(value);
+}
+
+bool DartUtilities::isMessagePort(Dart_Handle handle)
+{
+    Dart_Handle dartType = DartUtilities::getDartHtmlType("MessagePort");
+    return objectIsType(handle, dartType);
+}
+
+MessagePort* DartUtilities::dartMessagePortToNativeMessagePort(void* value)
+{
+    return static_cast<MessagePort*>(value);
+}
+
+static Dart_TypedData_Type typedDataTypeFromViewType(ArrayBufferView::ViewType type)
+{
+    switch (type) {
+    case ArrayBufferView::TypeInt8:
+        return Dart_TypedData_kInt8;
+    case ArrayBufferView::TypeUint8:
+        return Dart_TypedData_kUint8;
+    case ArrayBufferView::TypeUint8Clamped:
+        return Dart_TypedData_kUint8Clamped;
+    case ArrayBufferView::TypeInt16:
+        return Dart_TypedData_kInt16;
+    case ArrayBufferView::TypeUint16:
+        return Dart_TypedData_kUint16;
+    case ArrayBufferView::TypeInt32:
+        return Dart_TypedData_kInt32;
+    case ArrayBufferView::TypeUint32:
+        return Dart_TypedData_kUint32;
+    case ArrayBufferView::TypeFloat32:
+        return Dart_TypedData_kFloat32;
+    case ArrayBufferView::TypeFloat64:
+        return Dart_TypedData_kFloat64;
+    case ArrayBufferView::TypeDataView:
+        return Dart_TypedData_kByteData;
+    }
+    ASSERT_NOT_REACHED();
+    return Dart_TypedData_kInvalid;
+}
+
+static unsigned elementSizeFromViewType(Dart_TypedData_Type type)
+{
+    switch (type) {
+    case Dart_TypedData_kByteData:
+        return sizeof(uint8_t);
+    case Dart_TypedData_kInt8:
+        return sizeof(int8_t);
+    case Dart_TypedData_kUint8:
+        return sizeof(uint8_t);
+    case Dart_TypedData_kUint8Clamped:
+        return sizeof(uint8_t);
+    case Dart_TypedData_kInt16:
+        return sizeof(int16_t);
+    case Dart_TypedData_kUint16:
+        return sizeof(uint16_t);
+    case Dart_TypedData_kInt32:
+        return sizeof(int32_t);
+    case Dart_TypedData_kUint32:
+        return sizeof(uint32_t);
+    case Dart_TypedData_kFloat32:
+        return sizeof(float);
+    case Dart_TypedData_kFloat64:
+        return sizeof(double);
+    case Dart_TypedData_kFloat32x4:
+        return 4 * sizeof(float);
+    default:
+        break;
+    }
+    ASSERT_NOT_REACHED();
+    return 0;
+}
+
+static unsigned elementSizeFromViewType(ArrayBufferView::ViewType type)
+{
+    return elementSizeFromViewType(typedDataTypeFromViewType(type));
+}
+
+class TypedDataPeer {
+public:
+    virtual ~TypedDataPeer() { };
+    virtual bool isViewPeer() = 0;
+};
+
+class TypedBufferPeer : public TypedDataPeer {
+public:
+    TypedBufferPeer(PassRefPtr<ArrayBuffer> buffer) : m_buffer(buffer) { }
+    virtual ~TypedBufferPeer() { }
+
+    PassRefPtr<ArrayBuffer> buffer()
+    {
+        return m_buffer;
+    }
+
+    virtual bool isViewPeer()
+    {
+        return false;
+    }
+
+private:
+    RefPtr<ArrayBuffer> m_buffer;
+};
+
+class TypedViewPeer : public TypedDataPeer {
+public:
+    TypedViewPeer(PassRefPtr<ArrayBufferView> view) : m_view(view) { }
+    virtual ~TypedViewPeer() { }
+
+    PassRefPtr<ArrayBufferView> view()
+    {
+        return m_view;
+    }
+
+    virtual bool isViewPeer()
+    {
+        return true;
+    }
+
+private:
+    RefPtr<ArrayBufferView> m_view;
+};
+
+static void externalArrayBufferCallback(void* isolateCallbackData, Dart_WeakPersistentHandle handle, void* peer)
+{
+    delete reinterpret_cast<TypedDataPeer*>(peer);
+}
+
+static Dart_Handle createExternalTypedData(Dart_TypedData_Type type, void* data, intptr_t numberOfElements, TypedDataPeer* peer, intptr_t peerSize, Dart_WeakPersistentHandleFinalizer callback)
+{
+    Dart_Handle newInstance = Dart_NewExternalTypedData(type, data, numberOfElements);
+    Dart_Handle result = Dart_SetPeer(newInstance, peer);
+    if (Dart_IsError(result))
+        return result;
+    Dart_NewWeakPersistentHandle(newInstance, peer, peerSize, callback);
+    return newInstance;
+}
+
+Dart_Handle DartUtilities::arrayBufferToDart(WTF::ArrayBuffer* buffer)
+{
+    void* data = buffer->data();
+    unsigned byteLength = buffer->byteLength();
+    TypedBufferPeer* peer = new TypedBufferPeer(buffer);
+    Dart_Handle typedData =  createExternalTypedData(Dart_TypedData_kUint8, data, byteLength, peer, byteLength, externalArrayBufferCallback);
+    ASSERT(!Dart_IsError(typedData));
+    return Dart_NewByteBuffer(typedData);
+}
+
+static bool externalTypedDataGetPeer(Dart_Handle handle, void** peer)
+{
+    *peer = 0;
+    Dart_Handle getPeerResult = Dart_GetPeer(handle, peer);
+    if (!Dart_IsError(getPeerResult) && *peer) {
+        return true;
+    }
+    return false;
+}
+
+static PassRefPtr<WTF::ArrayBuffer> dartToArrayBufferHelper(Dart_Handle array, Dart_Handle& exception, bool externalize)
+{
+    void* data = 0;
+
+    // If a ByteBuffer is passed in extract the typed data first.
+    if (Dart_IsByteBuffer(array)) {
+        array = Dart_GetDataFromByteBuffer(array);
+    }
+
+    // Check if the Dart array buffer object is external and has an
+    // ArrayBuffer peer.
+    if (externalTypedDataGetPeer(array, &data) && !reinterpret_cast<TypedDataPeer*>(data)->isViewPeer()) {
+        return reinterpret_cast<TypedBufferPeer*>(data)->buffer();
+    }
+
+    Dart_TypedData_Type type;
+    intptr_t elementLength = 0;
+    intptr_t byteLength = 0;
+
+    // Check if the Dart object is a typed data object by acquiring its data.
+    // If it is, create a thin ArrayBuffer wrapper around the data in the dart
+    // heap.
+    Dart_Handle result = Dart_TypedDataAcquireData(array, &type, &data, &elementLength);
+    if (Dart_IsError(result)) {
+        exception = Dart_NewStringFromCString("Typed data object expected");
+        return nullptr;
+    }
+    // FIXME: we really shouldn't release the data until we are done with it.
+    Dart_TypedDataReleaseData(array);
+    byteLength = elementLength * elementSizeFromViewType(type);
+    return externalize ? ArrayBuffer::create(data, byteLength) : ArrayBuffer::createNoCopy(data, byteLength);
+}
+
+PassRefPtr<WTF::ArrayBuffer> DartUtilities::dartToArrayBuffer(Dart_Handle array, Dart_Handle& exception)
+{
+    return dartToArrayBufferHelper(array, exception, false);
+}
+
+PassRefPtr<WTF::ArrayBuffer> DartUtilities::dartToExternalizedArrayBuffer(Dart_Handle array, Dart_Handle& exception)
+{
+    return dartToArrayBufferHelper(array, exception, true);
+}
+
+// FIXME: This mapping to dart objects loses object identity for
+// the buffer part of views. If we have two views on the same buffer
+// in C++ and we create dart wrappers we will get two different dart
+// buffer objects. Additionally, this means that neutering will not work.
+Dart_Handle DartUtilities::arrayBufferViewToDart(WTF::ArrayBufferView* view)
+{
+    ArrayBufferView::ViewType type = view->type();
+    void* address = view->baseAddress();
+    unsigned byteLength = view->byteLength();
+    unsigned length = byteLength / elementSizeFromViewType(type);
+    TypedViewPeer* peer = new TypedViewPeer(view);
+    return createExternalTypedData(typedDataTypeFromViewType(type), address, length, peer, byteLength, externalArrayBufferCallback);
+}
+
+
+// FIXME: Again, this breaks the view-buffer relationship.
+static PassRefPtr<WTF::ArrayBufferView> dartToArrayBufferViewHelper(Dart_Handle array, Dart_Handle& exception, bool externalize)
+{
+    void* data = 0;
+
+    // Check if the array is external and has an ArrayBufferView peer.
+    if (externalTypedDataGetPeer(array, &data)) {
+        if (!reinterpret_cast<TypedDataPeer*>(data)->isViewPeer()) {
+            exception = Dart_NewStringFromCString("Typed data view expected");
+            return nullptr;
+        }
+        return reinterpret_cast<TypedViewPeer*>(data)->view();
+    }
+
+    // Check if the dart object is an internal typed data object and get
+    // the data from it.
+    Dart_TypedData_Type type;
+    intptr_t elementLength = 0;
+    Dart_Handle result = Dart_TypedDataAcquireData(array, &type, &data, &elementLength);
+    if (Dart_IsError(result)) {
+        exception = Dart_NewStringFromCString("Typed data object expected");
+        return nullptr;
+    }
+    intptr_t byteLength = elementLength * elementSizeFromViewType(type);
+    // FIXME: we really shouldn't release the data until we are done with it.
+    Dart_TypedDataReleaseData(array);
+    RefPtr<ArrayBuffer> buffer = externalize ? ArrayBuffer::create(data, byteLength) : ArrayBuffer::createNoCopy(data, byteLength);
+
+    switch (type) {
+    case Dart_TypedData_kByteData:
+        return DataView::create(buffer, 0, elementLength);
+    case Dart_TypedData_kInt8:
+        return Int8Array::create(buffer, 0, elementLength);
+    case Dart_TypedData_kUint8:
+        return Uint8Array::create(buffer, 0, elementLength);
+    case Dart_TypedData_kUint8Clamped:
+        return Uint8ClampedArray::create(buffer, 0, elementLength);
+    case Dart_TypedData_kInt16:
+        return Uint16Array::create(buffer, 0, elementLength);
+    case Dart_TypedData_kUint16:
+        return Uint16Array::create(buffer, 0, elementLength);
+    case Dart_TypedData_kInt32:
+        return Int32Array::create(buffer, 0, elementLength);
+    case Dart_TypedData_kUint32:
+        return Uint32Array::create(buffer, 0, elementLength);
+    case Dart_TypedData_kFloat32:
+        return Float32Array::create(buffer, 0, elementLength);
+    case Dart_TypedData_kFloat64:
+        return Float64Array::create(buffer, 0, elementLength);
+    case Dart_TypedData_kFloat32x4:
+        return Float32Array::create(buffer, 0, elementLength * sizeof(float));
+    default:
+        break;
+    }
+    ASSERT_NOT_REACHED();
+    return nullptr;
+}
+
+PassRefPtr<WTF::ArrayBufferView> DartUtilities::dartToArrayBufferView(Dart_Handle array, Dart_Handle& exception)
+{
+    return dartToArrayBufferViewHelper(array, exception, false);
+}
+
+PassRefPtr<WTF::ArrayBufferView> DartUtilities::dartToExternalizedArrayBufferView(Dart_Handle array, Dart_Handle& exception)
+{
+    return dartToArrayBufferViewHelper(array, exception, true);
+}
+
+PassRefPtr<WTF::Int8Array> DartUtilities::dartToInt8ArrayWithNullCheck(Dart_Handle handle, Dart_Handle& exception)
+{
+    return Dart_IsNull(handle) ? nullptr : dartToInt8Array(handle, exception);
+}
+
+PassRefPtr<WTF::Int8Array> DartUtilities::dartToInt8Array(Dart_Handle handle, Dart_Handle& exception)
+{
+    RefPtr<ArrayBufferView> view = DartUtilities::dartToArrayBufferView(handle, exception);
+    if (exception)
+        return nullptr;
+    if (view->type() == ArrayBufferView::TypeInt8)
+        return reinterpret_cast<Int8Array*>(view.get());
+    exception = Dart_NewStringFromCString("Int8List expected");
+    return nullptr;
+}
+
+PassRefPtr<WTF::Int8Array> DartUtilities::dartToInt8ArrayWithNullCheck(Dart_NativeArguments args, int idx, Dart_Handle& exception)
+{
+    Dart_Handle object = Dart_GetNativeArgument(args, idx);
+    return dartToInt8ArrayWithNullCheck(object, exception);
+}
+
+PassRefPtr<WTF::Int8Array> DartUtilities::dartToInt8Array(Dart_NativeArguments args, int idx, Dart_Handle& exception)
+{
+    Dart_Handle object = Dart_GetNativeArgument(args, idx);
+    return dartToInt8Array(object, exception);
+}
+
+PassRefPtr<WTF::Int32Array> DartUtilities::dartToInt32ArrayWithNullCheck(Dart_Handle handle, Dart_Handle& exception)
+{
+    return Dart_IsNull(handle) ? nullptr : dartToInt32Array(handle, exception);
+}
+
+PassRefPtr<WTF::Int32Array> DartUtilities::dartToInt32Array(Dart_Handle handle, Dart_Handle& exception)
+{
+    RefPtr<ArrayBufferView> view = DartUtilities::dartToArrayBufferView(handle, exception);
+    if (exception)
+        return nullptr;
+    if (view->type() == ArrayBufferView::TypeInt32)
+        return reinterpret_cast<Int32Array*>(view.get());
+    exception = Dart_NewStringFromCString("Int32List expected");
+    return nullptr;
+}
+
+PassRefPtr<WTF::Int32Array> DartUtilities::dartToInt32ArrayWithNullCheck(Dart_NativeArguments args, int idx, Dart_Handle& exception)
+{
+    Dart_Handle object = Dart_GetNativeArgument(args, idx);
+    return dartToInt32ArrayWithNullCheck(object, exception);
+}
+
+PassRefPtr<WTF::Int32Array> DartUtilities::dartToInt32Array(Dart_NativeArguments args, int idx, Dart_Handle& exception)
+{
+    Dart_Handle object = Dart_GetNativeArgument(args, idx);
+    return dartToInt32Array(object, exception);
+}
+
+PassRefPtr<WTF::Uint8ClampedArray> DartUtilities::dartToUint8ClampedArrayWithNullCheck(Dart_Handle handle, Dart_Handle& exception)
+{
+    return Dart_IsNull(handle) ? nullptr : dartToUint8ClampedArray(handle, exception);
+}
+
+PassRefPtr<WTF::Uint8ClampedArray> DartUtilities::dartToUint8ClampedArray(Dart_Handle handle, Dart_Handle& exception)
+{
+    RefPtr<ArrayBufferView> view = DartUtilities::dartToArrayBufferView(handle, exception);
+    if (exception)
+        return nullptr;
+    if (view->type() == ArrayBufferView::TypeUint8Clamped)
+        return reinterpret_cast<Uint8ClampedArray*>(view.get());
+    exception = Dart_NewStringFromCString("Uint8ClampedList expected");
+    return nullptr;
+}
+
+PassRefPtr<WTF::Uint8ClampedArray> DartUtilities::dartToUint8ClampedArrayWithNullCheck(Dart_NativeArguments args, int idx, Dart_Handle& exception)
+{
+    Dart_Handle object = Dart_GetNativeArgument(args, idx);
+    return dartToUint8ClampedArrayWithNullCheck(object, exception);
+}
+
+PassRefPtr<WTF::Uint8ClampedArray> DartUtilities::dartToUint8ClampedArray(Dart_NativeArguments args, int idx, Dart_Handle& exception)
+{
+    Dart_Handle object = Dart_GetNativeArgument(args, idx);
+    return dartToUint8ClampedArray(object, exception);
+}
+
+PassRefPtr<WTF::Uint8Array> DartUtilities::dartToUint8ArrayWithNullCheck(Dart_Handle handle, Dart_Handle& exception)
+{
+    return Dart_IsNull(handle) ? nullptr : dartToUint8Array(handle, exception);
+}
+
+PassRefPtr<WTF::Uint8Array> DartUtilities::dartToUint8Array(Dart_Handle handle, Dart_Handle& exception)
+{
+    RefPtr<ArrayBufferView> view = DartUtilities::dartToArrayBufferView(handle, exception);
+    if (exception)
+        return nullptr;
+    if (view->type() == ArrayBufferView::TypeUint8)
+        return reinterpret_cast<Uint8Array*>(view.get());
+    exception = Dart_NewStringFromCString("Uint8List expected");
+    return nullptr;
+}
+
+PassRefPtr<WTF::Uint8Array> DartUtilities::dartToUint8ArrayWithNullCheck(Dart_NativeArguments args, int idx, Dart_Handle& exception)
+{
+    Dart_Handle object = Dart_GetNativeArgument(args, idx);
+    return dartToUint8ArrayWithNullCheck(object, exception);
+}
+
+PassRefPtr<WTF::Uint8Array> DartUtilities::dartToUint8Array(Dart_NativeArguments args, int idx, Dart_Handle& exception)
+{
+    Dart_Handle object = Dart_GetNativeArgument(args, idx);
+    return dartToUint8Array(object, exception);
+}
+
+PassRefPtr<WTF::Float32Array> DartUtilities::dartToFloat32ArrayWithNullCheck(Dart_Handle handle, Dart_Handle& exception)
+{
+    return Dart_IsNull(handle) ? nullptr : dartToFloat32Array(handle, exception);
+}
+
+PassRefPtr<WTF::Float32Array> DartUtilities::dartToFloat32Array(Dart_Handle handle, Dart_Handle& exception)
+{
+    RefPtr<ArrayBufferView> view = DartUtilities::dartToArrayBufferView(handle, exception);
+    if (exception)
+        return nullptr;
+    if (view->type() == ArrayBufferView::TypeFloat32)
+        return reinterpret_cast<Float32Array*>(view.get());
+    exception = Dart_NewStringFromCString("Float32List expected");
+    return nullptr;
+}
+
+PassRefPtr<WTF::Float32Array> DartUtilities::dartToFloat32ArrayWithNullCheck(Dart_NativeArguments args, int idx, Dart_Handle& exception)
+{
+    Dart_Handle object = Dart_GetNativeArgument(args, idx);
+    return dartToFloat32ArrayWithNullCheck(object, exception);
+}
+
+PassRefPtr<WTF::Float32Array> DartUtilities::dartToFloat32Array(Dart_NativeArguments args, int idx, Dart_Handle& exception)
+{
+    Dart_Handle object = Dart_GetNativeArgument(args, idx);
+    return dartToFloat32Array(object, exception);
+}
+
+bool DartUtilities::isUint8Array(Dart_Handle object)
+{
+    return Dart_GetTypeOfTypedData(object) == Dart_TypedData_kUint8;
+}
+
+bool DartUtilities::isUint8ClampedArray(Dart_Handle object)
+{
+    return Dart_GetTypeOfTypedData(object) == Dart_TypedData_kUint8Clamped;
+}
+
+SQLValue DartUtilities::toSQLValue(Dart_Handle object, Dart_Handle& exception)
+{
+    if (Dart_IsNull(object))
+        return SQLValue();
+
+    if (Dart_IsNumber(object))
+        return SQLValue(DartUtilities::dartToDouble(object, exception));
+
+    return SQLValue(DartUtilities::dartToString(object, exception));
+}
+
+PassRefPtr<SerializedScriptValue> DartUtilities::dartToSerializedScriptValue(Dart_Handle object, Dart_Handle& exception)
+{
+    return toSerializedScriptValue(object, 0, 0, exception);
+}
+
+Dart_Handle DartUtilities::serializedScriptValueToDart(PassRefPtr<SerializedScriptValue> value)
+{
+    // FIXME: better error handling.
+    Dart_Handle exception = 0;
+    return V8Converter::toDart(value->deserialize(), exception);
+}
+
+// FIXME: this function requires better testing. Currently blocking as new MessageChannel hasn't been implemented yet.
+void DartUtilities::toMessagePortArray(Dart_Handle value, MessagePortArray& ports, ArrayBufferArray& arrayBuffers, Dart_Handle& exception)
+{
+    Vector<Dart_Handle> elements;
+    DartUtilities::extractListElements(value, exception, elements);
+    if (exception)
+        return;
+
+    for (size_t i = 0; i < elements.size(); i++) {
+        Dart_Handle element = elements[i];
+        if (DartUtilities::isMessagePort(element)) {
+            MessagePort* messagePort = DartUtilities::dartMessagePortToNativeMessagePort(element);
+            ASSERT(messagePort);
+            ports.append(messagePort);
+            continue;
+        }
+
+        if (Dart_IsByteBuffer(element)) {
+            element = Dart_GetDataFromByteBuffer(element);
+            RefPtr<ArrayBuffer> arrayBuffer = DartUtilities::dartToExternalizedArrayBuffer(element, exception);
+            ASSERT(!exception);
+            ASSERT(arrayBuffer);
+            arrayBuffers.append(arrayBuffer);
+            continue;
+        }
+
+        exception = Dart_NewStringFromCString("TransferArray argument must contain only Transferables");
+        return;
+    }
+}
+
+Dictionary DartUtilities::dartToDictionary(Dart_Handle object, Dart_Handle& exception)
+{
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    v8::Local<v8::Value> value = v8::Local<v8::Value>::New(v8Isolate, V8Converter::toV8(object, exception));
+    if (exception)
+        return Dictionary();
+    return Dictionary(value, v8Isolate);
+}
+
+Dictionary DartUtilities::dartToDictionaryWithNullCheck(Dart_Handle object, Dart_Handle& exception)
+{
+    if (Dart_IsNull(object))
+        return Dictionary();
+    return dartToDictionary(object, exception);
+}
+
+Dictionary DartUtilities::dartToDictionary(Dart_NativeArguments args, int idx, Dart_Handle& exception)
+{
+    Dart_Handle object = Dart_GetNativeArgument(args, idx);
+    return dartToDictionary(object, exception);
+}
+
+Dictionary DartUtilities::dartToDictionaryWithNullCheck(Dart_NativeArguments args, int idx, Dart_Handle& exception)
+{
+    Dart_Handle object = Dart_GetNativeArgument(args, idx);
+    return dartToDictionaryWithNullCheck(object, exception);
+}
+
+LocalDOMWindow* DartUtilities::domWindowForCurrentIsolate()
+{
+    DartDOMData* domData = DartDOMData::current();
+    ASSERT(domData->scriptExecutionContext()->isDocument());
+    Document* document = static_cast<Document*>(domData->scriptExecutionContext());
+    return document->domWindow();
+}
+
+V8ScriptState* DartUtilities::v8ScriptStateForCurrentIsolate()
+{
+    return V8ScriptState::forMainWorld(domWindowForCurrentIsolate()->frame());
+}
+
+ExecutionContext* DartUtilities::scriptExecutionContext()
+{
+    if (Dart_CurrentIsolate())
+        return DartDOMData::current()->scriptExecutionContext();
+    return 0;
+}
+
+bool DartUtilities::processingUserGesture()
+{
+    // FIXME: implement this.
+    return false;
+}
+
+intptr_t DartUtilities::libraryHandleToLibraryId(Dart_Handle library)
+{
+    intptr_t libraryId = -1;
+    Dart_Handle ALLOW_UNUSED result = Dart_LibraryId(library, &libraryId);
+    ASSERT(!Dart_IsError(result));
+    return libraryId;
+}
+
+DartScriptState* DartUtilities::currentScriptState()
+{
+    DartDOMData* dartDOMData = DartDOMData::current();
+    if (!dartDOMData->rootScriptState()) {
+        DartController* controller = DartController::retrieve(dartDOMData->scriptExecutionContext());
+        intptr_t libraryId = DartUtilities::libraryHandleToLibraryId(Dart_RootLibrary());
+        DartScriptState* scriptState = controller->lookupScriptState(Dart_CurrentIsolate(), currentV8Context(), libraryId);
+        dartDOMData->setRootScriptState(scriptState);
+        return scriptState;
+    }
+    return dartDOMData->rootScriptState();
+}
+
+PassRefPtr<ScriptArguments> DartUtilities::createScriptArguments(Dart_Handle argument, Dart_Handle& exception)
+{
+    Vector<ScriptValue> arguments;
+    arguments.append(DartUtilities::dartToScriptValue(argument));
+    return ScriptArguments::create(DartUtilities::currentScriptState(), arguments);
+}
+
+static PassRefPtr<ScriptCallStack> createScriptCallStackFromStackTrace(Dart_StackTrace stackTrace)
+{
+    uintptr_t frameCount = 0;
+    Dart_Handle result = Dart_StackTraceLength(stackTrace, reinterpret_cast<intptr_t*>(&frameCount));
+    if (Dart_IsError(result))
+        return nullptr;
+
+    if (frameCount > ScriptCallStack::maxCallStackSizeToCapture)
+        frameCount = ScriptCallStack::maxCallStackSizeToCapture;
+
+    Dart_Isolate isolate = Dart_CurrentIsolate();
+    Vector<ScriptCallFrame> scriptCallStackFrames;
+    for (uintptr_t frameIndex = 0; frameIndex < frameCount; frameIndex++) {
+        Dart_ActivationFrame frame = 0;
+        result = Dart_GetActivationFrame(stackTrace, frameIndex, &frame);
+        if (Dart_IsError(result)) {
+            return nullptr;
+        }
+        ASSERT(frame);
+
+        Dart_Handle dartFunctionName;
+        Dart_Handle dartScriptUrl;
+        intptr_t lineNumber = 0;
+        intptr_t columnNumber = 0;
+        result = Dart_ActivationFrameInfo(frame, &dartFunctionName, &dartScriptUrl, &lineNumber, &columnNumber);
+        if (Dart_IsError(result)) {
+            return nullptr;
+        }
+
+        // This skips frames where source is unavailable. WebKit code for the
+        // console assumes that console.log et al. are implemented directly
+        // as natives, i.e. that the top-of-stack will be the caller of
+        // console.log. The Dart implementation involves intermediate Dart
+        // calls, which are skipped by this clause.
+        if (columnNumber == -1)
+            continue;
+
+        String functionName = DartUtilities::toString(dartFunctionName);
+        String scriptUrl = DartUtilities::toString(dartScriptUrl);
+
+        scriptCallStackFrames.append(ScriptCallFrame(functionName, DartScriptDebugServer::shared().getScriptId(scriptUrl, isolate), scriptUrl, lineNumber, columnNumber));
+    }
+    if (scriptCallStackFrames.isEmpty())
+        scriptCallStackFrames.append(ScriptCallFrame("undefined", "undefined", "undefined", 0, 0));
+
+    return ScriptCallStack::create(scriptCallStackFrames);
+}
+
+ScriptCallFrame DartUtilities::getTopFrame(Dart_StackTrace stackTrace, Dart_Handle& exception)
+{
+    {
+        uintptr_t frameCount = 0;
+        Dart_Handle result = Dart_StackTraceLength(stackTrace, reinterpret_cast<intptr_t*>(&frameCount));
+        if (Dart_IsError(result)) {
+            exception = result;
+            goto fail;
+        }
+        if (!frameCount) {
+            exception = Dart_NewStringFromCString("Empty stack trace");
+            goto fail;
+        }
+        Dart_ActivationFrame frame = 0;
+        result = Dart_GetActivationFrame(stackTrace, 0, &frame);
+        if (Dart_IsError(result)) {
+            exception = result;
+            goto fail;
+        }
+        ASSERT(frame);
+        return toScriptCallFrame(frame, exception);
+    }
+fail:
+    return ScriptCallFrame("undefined", "undefined", "undefined", 0, 0);
+}
+
+ScriptCallFrame DartUtilities::toScriptCallFrame(Dart_ActivationFrame frame, Dart_Handle& exception)
+{
+    ASSERT(frame);
+    Dart_Handle functionName;
+    Dart_Handle scriptUrl;
+    intptr_t lineNumber = 0;
+    intptr_t columnNumber = 0;
+    Dart_Handle result = Dart_ActivationFrameInfo(frame, &functionName, &scriptUrl, &lineNumber, &columnNumber);
+    if (Dart_IsError(result)) {
+        exception = result;
+        return ScriptCallFrame("undefined", "undefined", "undefined", 0, 0);
+    }
+    return ScriptCallFrame(DartUtilities::toString(functionName), "undefined", DartUtilities::toString(scriptUrl), lineNumber, columnNumber);
+}
+
+PassRefPtr<ScriptCallStack> DartUtilities::createScriptCallStack()
+{
+    Dart_StackTrace trace = 0;
+    Dart_Handle ALLOW_UNUSED result = Dart_GetStackTrace(&trace);
+    ASSERT(!Dart_IsError(result));
+    ASSERT(!Dart_IsNull(result));
+    ASSERT(trace);
+    return createScriptCallStackFromStackTrace(trace);
+}
+
+static const uint8_t* snapshotBuffer(int index)
+{
+// DartSnapshot.bytes is generated by build system.
+#include "bindings/dart/DartSnapshot.bytes"
+    ASSERT(index == DartUtilities::VmIsolateSnapshotId || index == DartUtilities::IsolateSnapshotId);
+    if (index == DartUtilities::VmIsolateSnapshotId) {
+        return vmIsolateSnapshotBuffer;
+    }
+    return isolateSnapshotBuffer;
+}
+
+const uint8_t* DartUtilities::vmIsolateSnapshot()
+{
+    return snapshotBuffer(VmIsolateSnapshotId);
+}
+
+const uint8_t* DartUtilities::isolateSnapshot()
+{
+    return snapshotBuffer(IsolateSnapshotId);
+}
+
+Dart_Handle DartUtilities::canonicalizeUrl(Dart_Handle library, Dart_Handle urlHandle, String url)
+{
+    DEFINE_STATIC_LOCAL(String, dartPrefix, ("dart:"));
+    DEFINE_STATIC_LOCAL(String, packagePrefix, ("package:"));
+
+    if (url.startsWith(dartPrefix) || url.startsWith(packagePrefix))
+        // Not a relative URL.
+        return urlHandle;
+
+    Dart_Handle libraryURLHandle = Dart_LibraryUrl(library);
+    ASSERT(!Dart_IsError(libraryURLHandle));
+    String libraryURL = DartUtilities::toString(libraryURLHandle);
+
+    String result;
+    if (libraryURL.startsWith(packagePrefix) && !libraryURL.startsWith("package://")) {
+        // KURL expects a URL with an authority. If the library URL is
+        // "package:<path>", we convert to "package://_/<path>" for resolution
+        // and convert back.
+        DEFINE_STATIC_LOCAL(String, resolvePrefix, ("package://_/"));
+
+        libraryURL = resolvePrefix + libraryURL.substring(packagePrefix.length());
+        result = KURL(KURL(KURL(), libraryURL), url).string();
+        if (result.startsWith(resolvePrefix))
+            result = packagePrefix + result.substring(resolvePrefix.length());
+    } else {
+        result = KURL(KURL(KURL(), libraryURL), url).string();
+    }
+
+    return DartUtilities::stringToDartString(result);
+}
+
+void DartUtilities::reportProblem(ExecutionContext* context, const String& error, int line, int col)
+{
+    String sourceURL = context->url().string();
+
+    // FIXME: Pass in stack trace.
+    if (context && context->isDocument()) {
+        int scriptId = 0;
+        static_cast<Document*>(context)->reportException(ErrorEvent::create(error, sourceURL, line, col, 0), scriptId, nullptr, NotSharableCrossOrigin);
+    }
+}
+
+void DartUtilities::reportProblem(ExecutionContext* context, Dart_Handle result)
+{
+    // FIXME: provide sourceURL.
+    String sourceURL = "FIXME";
+    reportProblem(context, result, sourceURL);
+}
+
+void DartUtilities::reportProblem(ExecutionContext* context, Dart_Handle result, const String& sourceURL)
+{
+    ASSERT(Dart_IsError(result));
+    ASSERT(!sourceURL.isEmpty());
+
+    const String internalErrorPrefix("Internal error: ");
+
+    String errorMessage;
+    // FIXME: line number info.
+    int lineNumber = 0;
+    // FIXME: call stack info.
+    RefPtr<ScriptCallStack> callStack;
+
+    if (!Dart_ErrorHasException(result)) {
+        errorMessage = internalErrorPrefix + Dart_GetError(result);
+    } else {
+        // Print the exception.
+        Dart_Handle exception = Dart_ErrorGetException(result);
+        ASSERT(!Dart_IsError(exception));
+
+        exception = Dart_ToString(exception);
+        if (Dart_IsError(exception))
+            errorMessage = String("Error: ") + Dart_GetError(exception);
+        else
+            errorMessage = String("Exception: ") + DartUtilities::toString(exception);
+
+        // Print the stack trace.
+        Dart_StackTrace stacktrace;
+        Dart_Handle ALLOW_UNUSED traceResult = Dart_GetStackTraceFromError(result, &stacktrace);
+        ASSERT(!Dart_IsError(traceResult));
+        callStack = createScriptCallStackFromStackTrace(stacktrace);
+    }
+
+    if (context && context->isDocument()) {
+        int scriptId = 0;
+        static_cast<Document*>(context)->reportException(ErrorEvent::create(errorMessage, sourceURL, lineNumber, 0, 0), scriptId, callStack, NotSharableCrossOrigin);
+    }
+}
+
+Dart_Handle DartUtilities::toDartCoreException(const String& className, const String& message)
+{
+    DartApiScope apiScope;
+    DartDOMData* domData = DartDOMData::current();
+    Dart_Handle coreLib = Dart_LookupLibrary(Dart_NewStringFromCString("dart:core"));
+    Dart_Handle errorClass = Dart_GetType(coreLib, stringToDart(className), 0, 0);
+    Dart_Handle dartMessage = stringToDart(message);
+    Dart_Handle error = Dart_New(errorClass, Dart_NewStringFromCString(""), 1, &dartMessage);
+    Dart_SetPersistentHandle(domData->currentException(), error);
+    return domData->currentException();
+}
+
+Dart_Handle DartUtilities::coreArgumentErrorException(const String& message)
+{
+    return DartUtilities::toDartCoreException("ArgumentError", message);
+}
+
+Dart_Handle DartUtilities::notImplementedException(const char* fileName, int lineNumber)
+{
+    Dart_Handle args[2] = { Dart_NewStringFromCString(fileName), Dart_NewInteger(lineNumber) };
+    Dart_Handle result = DartUtilities::invokeUtilsMethod("makeUnimplementedError", 2, args);
+    ASSERT(!Dart_IsError(result));
+    return result;
+}
+
+Dart_Handle DartUtilities::newResolvedPromise(Dart_Handle value)
+{
+    Dart_Handle asyncLib = Dart_LookupLibrary(Dart_NewStringFromCString("dart:async"));
+    Dart_Handle futureClass = Dart_GetType(asyncLib, Dart_NewStringFromCString("Future"), 0, 0);
+    return Dart_New(futureClass, Dart_NewStringFromCString("value"), 1, &value);
+}
+
+Dart_Handle DartUtilities::newSmashedPromise(Dart_Handle error)
+{
+    Dart_Handle asyncLib = Dart_LookupLibrary(Dart_NewStringFromCString("dart:async"));
+    Dart_Handle futureClass = Dart_GetType(asyncLib, Dart_NewStringFromCString("Future"), 0, 0);
+    return Dart_New(futureClass, Dart_NewStringFromCString("error"), 1, &error);
+}
+
+Dart_Handle DartUtilities::newResolver()
+{
+    Dart_Handle asyncLib = Dart_LookupLibrary(Dart_NewStringFromCString("dart:async"));
+    Dart_Handle futureClass = Dart_GetType(asyncLib, Dart_NewStringFromCString("Completer"), 0, 0);
+    return Dart_New(futureClass, Dart_EmptyString(), 0, 0);
+}
+
+Dart_Handle DartUtilities::newArgumentError(const String& message)
+{
+    Dart_Handle asyncLib = Dart_LookupLibrary(Dart_NewStringFromCString("dart:core"));
+    Dart_Handle futureClass = Dart_GetType(asyncLib, Dart_NewStringFromCString("ArgumentError"), 0, 0);
+    Dart_Handle dartMessage = stringToDart(message);
+    return Dart_New(futureClass, Dart_EmptyString(), 1, &dartMessage);
+}
+
+Dart_Handle DartUtilities::invokeUtilsMethod(const char* methodName, int argCount, Dart_Handle* args)
+{
+    DartDOMData* domData = DartDOMData::current();
+    ASSERT(domData);
+    Dart_PersistentHandle library = domData->htmlLibrary();
+    ASSERT(!Dart_IsError(library));
+
+    Dart_Handle utilsClass = Dart_GetType(library, Dart_NewStringFromCString("_Utils"), 0, 0);
+    ASSERT(!Dart_IsError(utilsClass));
+
+    return Dart_Invoke(utilsClass, Dart_NewStringFromCString(methodName), argCount, args);
+}
+
+
+int DartUtilities::getProp(const char* name, char* value, int valueLen)
+{
+#if OS(ANDROID)
+    return __system_property_get(name, value);
+#else
+    char* v = getenv(name);
+    if (!v) {
+        return 0;
+    }
+    ASSERT(valueLen > 0 && static_cast<size_t>(valueLen) > strlen(v));
+    strncpy(value, v, valueLen);
+    value[valueLen - 1] = '\0';
+    return strlen(value);
+#endif
+}
+}