Added Dartium changes onto 45.0.2454.104

Source/bindings/core/dart/DartHandleProxy.cpp

+/*
+ * Copyright (C) 2012 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/DartHandleProxy.h"
+
+#include "bindings/core/dart/DartJsInterop.h"
+#include "bindings/core/dart/DartPersistentValue.h"
+#include "bindings/core/dart/V8Converter.h"
+#include "bindings/core/v8/PageScriptDebugServer.h"
+#include "bindings/core/v8/ScriptController.h"
+#include "bindings/core/v8/V8Binding.h"
+#include "bindings/core/v8/V8ScriptRunner.h"
+#include "bindings/core/v8/V8ThrowException.h"
+
+#include "wtf/StdLibExtras.h"
+
+namespace blink {
+
+struct DartHandleProxy::CallbackData {
+    ScopedPersistent<v8::Object> handle;
+    DartPersistentValue* value;
+};
+
+typedef HashMap<String, v8::Persistent<v8::FunctionTemplate>* > FunctionTemplateMap;
+
+static v8::Local<v8::FunctionTemplate> objectProxyTemplate(Dart_Handle instance);
+static v8::Local<v8::FunctionTemplate> functionProxyTemplate();
+static v8::Local<v8::FunctionTemplate> libraryProxyTemplate(v8::Handle<v8::String> libraryNameV8);
+static v8::Local<v8::FunctionTemplate> typeProxyTemplate(Dart_Handle type);
+static v8::Local<v8::FunctionTemplate> frameProxyTemplate();
+
+DartPersistentValue* DartHandleProxy::readPointerFromProxy(v8::Handle<v8::Value> proxy)
+{
+    void* pointer = proxy.As<v8::Object>()->GetAlignedPointerFromInternalField(0);
+    return static_cast<DartPersistentValue*>(pointer);
+}
+
+bool DartHandleProxy::isDartProxy(v8::Handle<v8::Value> value)
+{
+    if (!value.IsEmpty() && value->IsObject()) {
+        v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+        v8::Local<v8::Value> hiddenValue = value.As<v8::Object>()->GetHiddenValue(v8::String::NewFromUtf8(v8Isolate, "dartProxy"));
+        return *hiddenValue && hiddenValue->IsBoolean();
+    }
+    return false;
+}
+
+bool isGlobalObjectProxy(v8::Handle<v8::Object> value)
+{
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    v8::Local<v8::Value> hiddenValue = value.As<v8::Object>()->GetHiddenValue(v8::String::NewFromUtf8(v8Isolate, "asGlobal"));
+    return *hiddenValue && hiddenValue->IsBoolean();
+}
+
+DartScopes::DartScopes(v8::Local<v8::Object> v8Handle, bool disableBreak) :
+    scriptValue(DartHandleProxy::readPointerFromProxy(v8Handle)),
+    scope(scriptValue->isolate()),
+    disableBreak(disableBreak)
+{
+    ASSERT(scriptValue->isIsolateAlive());
+    handle = scriptValue->value();
+    if (disableBreak) {
+        previousPauseInfo = Dart_GetExceptionPauseInfo();
+        Dart_SetExceptionPauseInfo(kNoPauseOnExceptions);
+    }
+}
+
+DartScopes::~DartScopes()
+{
+    if (disableBreak) {
+        Dart_SetExceptionPauseInfo(previousPauseInfo);
+    }
+}
+
+static void weakCallback(const v8::WeakCallbackData<v8::Object, DartHandleProxy::CallbackData >& data)
+{
+    DartHandleProxy::CallbackData* callbackData = data.GetParameter();
+    callbackData->handle.clear();
+    delete callbackData->value;
+    delete callbackData;
+}
+
+Dart_Handle DartHandleProxy::unwrapValue(v8::Handle<v8::Value> value)
+{
+    if (DartHandleProxy::isDartProxy(value))
+        return readPointerFromProxy(value)->value();
+
+    Dart_Handle exception = 0;
+    Dart_Handle handle = V8Converter::toDart(value, exception);
+    ASSERT(!exception);
+    return handle;
+}
+
+bool libraryHasMember(Dart_Handle library, Dart_Handle name)
+{
+    return !Dart_IsError(Dart_GetField(library, name))
+        || !Dart_IsError(Dart_GetType(library, name, 0, 0))
+        || Dart_IsFunction(Dart_LookupFunction(library, name));
+}
+
+bool typeHasMember(Dart_Handle type, Dart_Handle name)
+{
+    return !Dart_IsError(Dart_GetField(type, name)) || Dart_IsFunction(Dart_LookupFunction(type, name));
+}
+
+Dart_Handle getEncodedMapKeyList(Dart_Handle object)
+{
+    return DartUtilities::invokeUtilsMethod("getEncodedMapKeyList", 1, &object);
+}
+
+Dart_Handle stripTrailingDot(Dart_Handle str)
+{
+    return DartUtilities::invokeUtilsMethod("stripTrailingDot", 1, &str);
+}
+
+Dart_Handle addTrailingDot(Dart_Handle str)
+{
+    return DartUtilities::invokeUtilsMethod("addTrailingDot", 1, &str);
+}
+
+Dart_Handle demangle(Dart_Handle str)
+{
+    return DartUtilities::invokeUtilsMethod("demangle", 1, &str);
+}
+
+Dart_Handle lookupValueForEncodedMapKey(Dart_Handle object, Dart_Handle key)
+{
+    Dart_Handle args[] = {object, key};
+    return DartUtilities::invokeUtilsMethod("lookupValueForEncodedMapKey", 2, args);
+}
+
+Dart_Handle buildConstructorName(Dart_Handle typeName, Dart_Handle constructorName)
+{
+    Dart_Handle args[] = {typeName, constructorName};
+    return DartUtilities::invokeUtilsMethod("buildConstructorName", 2, args);
+}
+
+Dart_Handle stripClassName(Dart_Handle str, Dart_Handle typeName)
+{
+    Dart_Handle args[] = {str, typeName};
+    return DartUtilities::invokeUtilsMethod("stripClassName", 2, args);
+}
+
+bool isNoSuchMethodError(Dart_Handle type)
+{
+    Dart_Handle exception = 0;
+    bool ret = DartUtilities::dartToBool(DartUtilities::invokeUtilsMethod("isNoSuchMethodError", 1, &type), exception);
+    ASSERT(!exception);
+    return ret;
+}
+
+Dart_Handle createLocalVariablesMap(Dart_Handle localVariablesList)
+{
+    return DartUtilities::invokeUtilsMethod("createLocalVariablesMap", 1, &localVariablesList);
+}
+
+Dart_Handle getMapKeyList(Dart_Handle localVariablesMap)
+{
+    return DartUtilities::invokeUtilsMethod("getMapKeyList", 1, &localVariablesMap);
+}
+
+bool mapContainsKey(Dart_Handle map, Dart_Handle key)
+{
+    Dart_Handle exception = 0;
+    return DartUtilities::dartToBool(Dart_Invoke(map, Dart_NewStringFromCString("containsKey"), 1, &key), exception);
+}
+
+void addFunctionNames(Dart_Handle handle, v8::Local<v8::Array>& properties, intptr_t* count, bool isInstance, bool noMethods)
+{
+    intptr_t length = 0;
+    Dart_Handle functionNames = Dart_GetFunctionNames(handle);
+    ASSERT(!Dart_IsError(functionNames));
+    bool isLibrary = Dart_IsLibrary(handle);
+    Dart_ListLength(functionNames, &length);
+    for (intptr_t i = 0; i < length; i++) {
+        Dart_Handle functionName = Dart_ListGetAt(functionNames, i);
+        Dart_Handle function = Dart_LookupFunction(handle, functionName);
+
+        // FIXME: the DartVM doesn't correctly handle invoking properties with
+        // private names. For now, skip private function names.
+        intptr_t functionNameLength = 0;
+        uint8_t* functionNameData;
+        Dart_StringToUTF8(functionName, &functionNameData, &functionNameLength);
+        if (functionNameLength > 0 && functionNameData[0] == '_')
+            continue;
+
+        bool isStatic = false;
+        Dart_FunctionIsStatic(function, &isStatic);
+
+        bool isConstructor = false;
+        Dart_FunctionIsConstructor(function, &isConstructor);
+
+        if (!isLibrary) {
+            if (isInstance == (isStatic || isConstructor))
+                continue;
+
+            bool isSetter = false;
+            Dart_FunctionIsSetter(function, &isSetter);
+            bool isGetter = false;
+            Dart_FunctionIsGetter(function, &isGetter);
+
+            if (noMethods && !isSetter && !isGetter)
+                continue;
+
+            // Skip setters as any setter we care to enumerate should have a matching getter.
+            // Setters without matching getters will still be callable but won't be enumerated.
+            if (isSetter)
+                continue;
+        }
+
+        // Strip off the leading typename from constructor name.
+        if (isConstructor)
+            functionName = stripClassName(functionName, Dart_TypeName(handle));
+
+        functionName = demangle(functionName);
+        properties->Set(*count, V8Converter::stringToV8(functionName));
+        *count = *count + 1;
+    }
+}
+
+void addClassNames(Dart_Handle library, v8::Local<v8::Array>& properties, intptr_t* count)
+{
+    intptr_t length = 0;
+    Dart_Handle typeNames = Dart_LibraryGetClassNames(library);
+    ASSERT(!Dart_IsNull(typeNames));
+    ASSERT(Dart_IsList(typeNames));
+    Dart_ListLength(typeNames, &length);
+    for (intptr_t i = 0; i < length; i++) {
+        Dart_Handle typeName = Dart_ListGetAt(typeNames, i);
+        properties->Set(*count, V8Converter::stringToV8(typeName));
+        *count = *count + 1;
+    }
+}
+
+void addFieldNames(Dart_Handle fieldNames, v8::Local<v8::Array>& properties, intptr_t* count)
+{
+    ASSERT(!Dart_IsApiError(fieldNames));
+    ASSERT(Dart_IsList(fieldNames));
+    intptr_t length = 0;
+    Dart_ListLength(fieldNames, &length);
+    for (intptr_t i = 0; i < length; i += 2) {
+        Dart_Handle fieldName = Dart_ListGetAt(fieldNames, i);
+        properties->Set(*count, V8Converter::stringToV8(demangle(fieldName)));
+        *count = *count + 1;
+    }
+}
+
+template<typename CallbackInfo>
+void setReturnValue(CallbackInfo info, Dart_Handle result)
+{
+    if (Dart_IsError(result)) {
+        // FIXME: we would really prefer to call the following however it has
+        // bad unintended consequences as then JS cannot catch the thrown exception.
+        // DartUtilities::reportProblem(DartUtilities::scriptExecutionContext(), result);
+        v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+        V8ThrowException::throwException(v8::String::NewFromUtf8(v8Isolate, Dart_GetError(result)), v8::Isolate::GetCurrent());
+    } else {
+        v8SetReturnValue(info, DartHandleProxy::create(result));
+    }
+}
+
+void DartHandleProxy::writePointerToProxy(v8::Local<v8::Object> proxy, Dart_Handle value)
+{
+    ASSERT(!proxy.IsEmpty());
+    DartPersistentValue* dartScriptValue = new DartPersistentValue(value);
+    proxy->SetAlignedPointerInInternalField(0, dartScriptValue);
+    v8::Isolate* isolate = v8::Isolate::GetCurrent();
+    v8::Persistent<v8::Object> persistentHandle;
+    DartHandleProxy::CallbackData* callbackData = new DartHandleProxy::CallbackData();
+    callbackData->value = dartScriptValue;
+    callbackData->handle.set(isolate, proxy);
+    callbackData->handle.setWeak(callbackData, &weakCallback);
+}
+
+intptr_t getLibraryId(v8::Local<v8::Object> proxy)
+{
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    return (intptr_t)proxy.As<v8::Object>()->GetHiddenValue(v8::String::NewFromUtf8(v8Isolate, "libraryId"))->Int32Value();
+}
+
+// Returns a String of the library prefix or Dart_Null if no prefix is found.
+Dart_Handle getLibraryPrefix(v8::Local<v8::Object> proxy)
+{
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    v8::Local<v8::Value> prefix = proxy.As<v8::Object>()->GetHiddenValue(v8::String::NewFromUtf8(v8Isolate, "prefix"));
+    if (*prefix && prefix->IsString())
+        return V8Converter::stringToDart(prefix);
+    return Dart_Null();
+}
+
+static void functionNamedPropertyGetter(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Value>& info)
+{
+    DartScopes scopes(info.Holder());
+    Dart_Handle handle = scopes.handle;
+
+    ASSERT(DartUtilities::isFunction(DartDOMData::current(), handle) || Dart_IsFunction(handle));
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    Dart_Handle ret = Dart_Invoke(handle, V8Converter::stringToDart(v8::String::Concat(v8::String::NewFromUtf8(v8Isolate, "get:"), name)), 0, 0);
+    if (Dart_IsError(ret) && name->Equals(v8::String::NewFromUtf8(v8Isolate, "__proto__")))
+        return;
+
+    setReturnValue(info, ret);
+}
+
+static void functionNamedPropertySetter(v8::Local<v8::String> property, v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<v8::Value>& info)
+{
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    V8ThrowException::throwException(v8::String::NewFromUtf8(v8Isolate, "Dart functions do not have writeable properties"), v8::Isolate::GetCurrent());
+}
+
+static void functionInvocationCallback(const v8::FunctionCallbackInfo<v8::Value>& args)
+{
+    DartScopes scopes(args.Holder());
+    Dart_Handle handle = scopes.handle;
+
+    DartDOMData* domData = DartDOMData::current();
+    ASSERT(DartUtilities::isFunction(domData, handle) || Dart_IsFunction(handle));
+    bool isConstructor = false;
+    Dart_FunctionIsConstructor(handle, &isConstructor);
+    if (args.IsConstructCall() != isConstructor) {
+        v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+        V8ThrowException::throwException(v8::String::NewFromUtf8(v8Isolate, isConstructor ? "Constructor called without new" : "Regular function called as constructor"), v8Isolate);
+        return;
+    }
+
+    Vector<Dart_Handle> dartFunctionArgs;
+    for (intptr_t i = 0; i < args.Length(); ++i)
+        dartFunctionArgs.append(DartHandleProxy::unwrapValue(args[i]));
+
+    if (DartUtilities::isFunction(domData, handle)) {
+        setReturnValue(args, Dart_InvokeClosure(handle, dartFunctionArgs.size(), dartFunctionArgs.data()));
+        return;
+    }
+    Dart_Handle type = Dart_FunctionOwner(handle);
+    if (isConstructor) {
+        // FIXME: this seems like an overly complex way to have to invoke a constructor.
+        setReturnValue(args,
+            Dart_New(type, stripClassName(Dart_FunctionName(handle), Dart_TypeName(type)),
+                dartFunctionArgs.size(), dartFunctionArgs.data()));
+    } else {
+        // Workaround so that invoking toString on a Class object returns
+        // something meaningful instead of throwing an exception.
+        if (Dart_IsType(type)) {
+            bool isStatic = true;
+            Dart_FunctionIsStatic(handle, &isStatic);
+            // Attempting to invoke a static method on a Class object will fail
+            // so there is not much harm in returning a more user friendly
+            // result for toString().
+            v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+            if (!isStatic && V8Converter::stringToV8(Dart_FunctionName(handle))->Equals(v8::String::NewFromUtf8(v8Isolate, "toString"))) {
+                setReturnValue(args, Dart_QualifiedTypeName(type));
+                return;
+            }
+        }
+        setReturnValue(args,
+            Dart_Invoke(type, Dart_FunctionName(handle), dartFunctionArgs.size(), dartFunctionArgs.data()));
+    }
+}
+
+static void typeProxyConstructorInvocationCallback(const v8::FunctionCallbackInfo<v8::Value>& args)
+{
+    DartScopes scopes(args.Holder());
+    Dart_Handle handle = scopes.handle;
+
+    ASSERT(Dart_IsType(handle));
+
+    if (!args.IsConstructCall()) {
+        v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+        V8ThrowException::throwException(v8::String::NewFromUtf8(v8Isolate, "Constructors can only be invoked with 'new'"), v8Isolate);
+        return;
+    }
+
+    Vector<Dart_Handle> dartFunctionArgs;
+    for (intptr_t i = 0; i < args.Length(); ++i)
+        dartFunctionArgs.append(DartHandleProxy::unwrapValue(args[i]));
+
+    setReturnValue(args, Dart_New(handle, Dart_Null(), dartFunctionArgs.size(), dartFunctionArgs.data()));
+}
+
+void getImportedLibrariesMatchingPrefix(intptr_t libraryId, Dart_Handle prefix, Vector<std::pair<Dart_Handle, intptr_t> >* libraries)
+{
+    Dart_Handle imports = Dart_GetLibraryImports(libraryId);
+    ASSERT(!Dart_IsError(imports));
+    // Unfortunately dart_tools_api.h adds a trailing dot to import prefixes.
+    if (!Dart_IsNull(prefix))
+        prefix = addTrailingDot(prefix);
+    intptr_t length = 0;
+    Dart_ListLength(imports, &length);
+    for (intptr_t i = 0; i < length; i += 2) {
+        Dart_Handle importPrefix = Dart_ListGetAt(imports, i);
+        ASSERT(Dart_IsNull(importPrefix) || Dart_IsString(importPrefix));
+        bool equals = false;
+        Dart_Handle ALLOW_UNUSED result = Dart_ObjectEquals(prefix, importPrefix, &equals);
+        ASSERT(!Dart_IsError(result));
+        if (equals) {
+            Dart_Handle importedLibraryIdHandle = Dart_ListGetAt(imports, i + 1);
+            ASSERT(Dart_IsInteger(importedLibraryIdHandle));
+            int64_t importedLibraryId;
+            Dart_IntegerToInt64(importedLibraryIdHandle, &importedLibraryId);
+            Dart_Handle libraryURL = Dart_GetLibraryURL(importedLibraryId);
+            ASSERT(!Dart_IsError(libraryURL));
+            Dart_Handle library = Dart_LookupLibrary(libraryURL);
+            ASSERT(Dart_IsLibrary(library));
+            libraries->append(std::pair<Dart_Handle, intptr_t>(library, importedLibraryId));
+        }
+    }
+}
+
+static bool libraryNamedPropertyGetterHelper(Dart_Handle library, Dart_Handle dartName,
+    const v8::PropertyCallbackInfo<v8::Value>* info)
+{
+    Dart_Handle ret;
+    ret  = Dart_GetField(library, dartName);
+    if (!Dart_IsApiError(ret)) {
+        if (info)
+            setReturnValue(*info, ret);
+        return true;
+    }
+
+    ret = Dart_GetType(library, dartName, 0, 0);
+    if (!Dart_IsError(ret)) {
+        if (info)
+            v8SetReturnValue(*info, DartHandleProxy::createTypeProxy(ret, true));
+        return true;
+    }
+
+    ret = Dart_LookupFunction(library, dartName);
+    if (!Dart_IsNull(ret) && !Dart_IsError(ret)) {
+        if (info)
+            setReturnValue(*info, ret);
+        return true;
+    }
+    return false;
+}
+
+/**
+ * Helper for getting library property values.
+ * Info may be 0 in which case no V8 If info is 0, no return value is set.
+ */
+static bool libraryNamedPropertyGetterHelper(v8::Local<v8::String> name, v8::Local<v8::Object> holder,
+    const v8::PropertyCallbackInfo<v8::Value>* info)
+{
+    DartScopes scopes(holder);
+    Dart_Handle handle = scopes.handle;
+
+    ASSERT(Dart_IsLibrary(handle));
+    intptr_t libraryId = getLibraryId(holder);
+    Dart_Handle dartName = V8Converter::stringToDart(name);
+    Dart_Handle prefix = getLibraryPrefix(holder);
+    bool hasLibraryPrefix = !Dart_IsNull(prefix) && Dart_IsString(prefix);
+
+    if (hasLibraryPrefix) {
+        Vector<std::pair<Dart_Handle, intptr_t> > libraries;
+        getImportedLibrariesMatchingPrefix(libraryId, prefix, &libraries);
+        for (size_t i = 0; i < libraries.size(); i++) {
+            if (libraryNamedPropertyGetterHelper(libraries[i].first, dartName, info))
+                return true;
+        }
+    } else {
+        if (libraryNamedPropertyGetterHelper(handle, dartName, info))
+            return true;
+
+        // Check whether there is at least one library imported with the specified prefix.
+        Vector<std::pair<Dart_Handle, intptr_t> > libraries;
+        getImportedLibrariesMatchingPrefix(libraryId, dartName, &libraries);
+        if (libraries.size() > 0) {
+            if (info)
+                v8SetReturnValue(*info, DartHandleProxy::createLibraryProxy(handle, libraryId, dartName, false));
+            return true;
+        }
+    }
+
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    if (name->Equals(v8::String::NewFromUtf8(v8Isolate, "__proto__"))) {
+        if (info)
+            v8SetReturnValue(*info, v8::Null(v8Isolate));
+        return true;
+    }
+    return false;
+}
+
+static void libraryNamedPropertyGetter(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Value>& info)
+{
+    libraryNamedPropertyGetterHelper(name, info.Holder(), &info);
+}
+
+// FIXME: we need to handle prefixes when setting library properties as well
+// for completness. Postponing implementing this for now as we hope Dart_Invoke
+// can just be fixed to handle libraries correctly.
+static void libraryNamedPropertySetter(v8::Local<v8::String> property, v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<v8::Value>& info)
+{
+    DartScopes scopes(info.Holder());
+    Dart_Handle handle = scopes.handle;
+
+    ASSERT(Dart_IsLibrary(handle));
+    Dart_Handle dartValue = DartHandleProxy::unwrapValue(value);
+    setReturnValue(info, Dart_SetField(handle, V8Converter::stringToDart(property), dartValue));
+}
+
+static void libraryQueryProperty(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Integer>& info)
+{
+    if (libraryNamedPropertyGetterHelper(name, info.Holder(), 0))
+        v8SetReturnValueInt(info, 0);
+}
+
+void libraryEnumerateHelper(Dart_Handle library, intptr_t libraryId, v8::Local<v8::Array> properties, intptr_t* count)
+{
+    addFunctionNames(library, properties, count, false, false);
+    addClassNames(library, properties, count);
+    addFieldNames(Dart_GetLibraryFields(libraryId), properties, count);
+}
+
+static void libraryPropertyEnumerator(const v8::PropertyCallbackInfo<v8::Array>& info)
+{
+    DartScopes scopes(info.Holder());
+    Dart_Handle handle = scopes.handle;
+
+    intptr_t libraryId = getLibraryId(info.Holder());
+    ASSERT(Dart_IsLibrary(handle));
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    v8::Local<v8::Array> cachedProperties = info.Holder().As<v8::Object>()->GetHiddenValue(v8::String::NewFromUtf8(v8Isolate, "cache")).As<v8::Array>();
+    if (*cachedProperties) {
+        v8SetReturnValue(info, cachedProperties);
+        return;
+    }
+
+    Dart_Handle prefix = getLibraryPrefix(info.Holder());
+    bool hasLibraryPrefix = Dart_IsString(prefix);
+
+    v8::Local<v8::Array> properties = v8::Array::New(v8Isolate);
+    intptr_t count = 0;
+
+    if (hasLibraryPrefix) {
+        Vector<std::pair<Dart_Handle, intptr_t> > libraries;
+        getImportedLibrariesMatchingPrefix(libraryId, prefix, &libraries);
+        for (size_t i = 0; i < libraries.size(); i++)
+            libraryEnumerateHelper(libraries[i].first, libraries[i].second, properties, &count);
+    } else {
+        libraryEnumerateHelper(handle, libraryId, properties, &count);
+        // Add all library prefixes of imports to the library.
+        Dart_Handle imports = Dart_GetLibraryImports(libraryId);
+        ASSERT(!Dart_IsError(imports));
+        intptr_t length = 0;
+        Dart_ListLength(imports, &length);
+        for (intptr_t i = 0; i < length; i += 2) {
+            Dart_Handle importPrefix = Dart_ListGetAt(imports, i);
+            if (!Dart_IsNull(importPrefix)) {
+                ASSERT(Dart_IsString(importPrefix));
+                properties->Set(count, V8Converter::stringToV8(
+                    demangle(stripTrailingDot(importPrefix))));
+                count++;
+            }
+        }
+    }
+
+    info.Holder()->SetHiddenValue(v8::String::NewFromUtf8(v8Isolate, "cache"), properties);
+    v8SetReturnValue(info, properties);
+}
+
+bool isShowStatics(v8::Handle<v8::Value> value)
+{
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    v8::Local<v8::Value> showStatics = value.As<v8::Object>()->GetHiddenValue(v8::String::NewFromUtf8(v8Isolate, "showStatics"));
+    ASSERT(*showStatics && showStatics->IsBoolean());
+    return showStatics->BooleanValue();
+}
+
+static void typeNamedPropertyGetter(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Value>& info)
+{
+    DartScopes scopes(info.Holder());
+    Dart_Handle handle = scopes.handle;
+
+    Dart_Handle ret;
+    ASSERT(Dart_IsType(handle));
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    if (name->Equals(v8::String::NewFromUtf8(v8Isolate, "__proto__"))) {
+        // Due to Dart semantics, if we are showing statics, we need to
+        // not link types up to their superclasses as statics in superclasses
+        // are not visible in subclasses.
+        if (isShowStatics(info.Holder())) {
+            v8SetReturnValue(info, v8::Null(v8Isolate));
+            return;
+        }
+
+        Dart_Handle supertype = Dart_GetSupertype(handle);
+        if (!Dart_IsNull(supertype))
+            v8SetReturnValue(info, DartHandleProxy::createTypeProxy(supertype, false));
+        else
+            v8SetReturnValue(info, v8::Null(v8Isolate));
+        return;
+    }
+
+    Dart_Handle dartName = V8Converter::stringToDart(name);
+    ret = Dart_GetField(handle, dartName);
+    if (!Dart_IsError(ret)) {
+        setReturnValue(info, ret);
+        return;
+    }
+    ret = Dart_LookupFunction(handle, dartName);
+    if (!Dart_IsNull(ret) && !Dart_IsError(ret)) {
+        setReturnValue(info, ret);
+        return;
+    }
+
+    Dart_Handle typeName = Dart_TypeName(handle);
+    ASSERT(Dart_IsString(typeName));
+    Dart_Handle constructorName = buildConstructorName(typeName, V8Converter::stringToDart(name));
+    ret = Dart_LookupFunction(handle, constructorName);
+    if (!Dart_IsNull(ret) && !Dart_IsError(ret))
+        setReturnValue(info, ret);
+}
+
+static void typeNamedPropertySetter(v8::Local<v8::String> property, v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<v8::Value>& info)
+{
+    DartScopes scopes(info.Holder());
+    Dart_Handle handle = scopes.handle;
+
+    ASSERT(Dart_IsType(handle));
+    Dart_Handle dartValue = DartHandleProxy::unwrapValue(value);
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    setReturnValue(info, Dart_Invoke(handle, V8Converter::stringToDart(v8::String::Concat(v8::String::NewFromUtf8(v8Isolate, "set:"), property)), 1, &dartValue));
+}
+
+static void typeQueryProperty(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Integer>& info)
+{
+    DartScopes scopes(info.Holder());
+    Dart_Handle handle = scopes.handle;
+
+    ASSERT(Dart_IsType(handle));
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    if (name->Equals(v8::String::NewFromUtf8(v8Isolate, "__proto__"))
+        || typeHasMember(handle, V8Converter::stringToDart(name)))
+        return v8SetReturnValueInt(info, 0);
+}
+
+static void typePropertyEnumerator(const v8::PropertyCallbackInfo<v8::Array>& info)
+{
+    DartScopes scopes(info.Holder());
+    Dart_Handle handle = scopes.handle;
+    bool showStatics = isShowStatics(info.Holder());
+
+    ASSERT(Dart_IsType(handle));
+
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    v8::Local<v8::Array> properties = v8::Array::New(v8Isolate);
+    intptr_t count = 0;
+    addFunctionNames(handle, properties, &count, !showStatics, false);
+    if (showStatics)
+        addFieldNames(Dart_GetStaticFields(handle), properties, &count);
+
+    properties->Set(count, v8::String::NewFromUtf8(v8Isolate, "__proto__"));
+    count++;
+    v8SetReturnValue(info, properties);
+}
+
+static void frameNamedPropertyGetter(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Value>& info)
+{
+    DartScopes scopes(info.Holder());
+    Dart_Handle handle = scopes.handle;
+
+    if (mapContainsKey(handle, V8Converter::stringToDart(name))) {
+        Dart_Handle indexedGetterOperator = Dart_NewStringFromCString("[]");
+        Dart_Handle dartName = V8Converter::stringToDart(name);
+        setReturnValue(info, Dart_Invoke(handle, indexedGetterOperator, 1, &dartName));
+    }
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    if (name->Equals(v8::String::NewFromUtf8(v8Isolate, "__proto__"))) {
+        v8SetReturnValue(info, v8::Null(v8Isolate));
+    }
+}
+
+static void frameNamedPropertySetter(v8::Local<v8::String> property, v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<v8::Value>& info)
+{
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    V8ThrowException::throwException(v8::String::NewFromUtf8(v8Isolate, "Dart does not yet provide a debugger api for setting local fields"), v8Isolate);
+}
+
+static void frameQueryProperty(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Integer>& info)
+{
+    DartScopes scopes(info.Holder());
+
+    if (mapContainsKey(scopes.handle, V8Converter::stringToDart(name)))
+        v8SetReturnValueInt(info, 0);
+}
+
+static void framePropertyEnumerator(const v8::PropertyCallbackInfo<v8::Array>& info)
+{
+    DartScopes scopes(info.Holder());
+    Dart_Handle keyList = getMapKeyList(scopes.handle);
+    ASSERT(!Dart_IsError(keyList));
+    ASSERT(Dart_IsList(keyList));
+
+    intptr_t length = 0;
+    Dart_ListLength(keyList, &length);
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    v8::Local<v8::Array> properties = v8::Array::New(v8Isolate, length);
+    for (intptr_t i = 0; i < length; i ++)
+        properties->Set(i, V8Converter::stringToV8(Dart_ListGetAt(keyList, i)));
+    v8SetReturnValue(info, properties);
+}
+
+static void namedPropertyGetter(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Value>& info)
+{
+    DartScopes scopes(info.Holder());
+    Dart_Handle handle = scopes.handle;
+
+    ASSERT(Dart_IsInstance(handle));
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    if (name->Equals(v8::String::NewFromUtf8(v8Isolate, "__proto__"))) {
+        v8SetReturnValue(info, DartHandleProxy::createTypeProxy(Dart_InstanceGetType(handle), false));
+        return;
+    }
+
+    v8::String::Utf8Value stringName(name);
+    const char* data = *stringName;
+    if (data[0] == ':' || data[0] == '#') {
+        // Look up a map key instead of a regular property as regular dart property names
+        // cannot start with these symbols.
+        setReturnValue(info,
+            lookupValueForEncodedMapKey(handle, V8Converter::stringToDart(name)));
+        return;
+    }
+    // Prefix for metadata used only by the Dart Editor debugger.
+    if (data[0] == '@') {
+        if (name->Equals(v8::String::NewFromUtf8(v8Isolate, "@staticFields"))) {
+            v8SetReturnValue(info, DartHandleProxy::createTypeProxy(Dart_InstanceGetType(handle), true));
+            return;
+        }
+        if (name->Equals(v8::String::NewFromUtf8(v8Isolate, "@library"))) {
+            intptr_t libraryId = 0;
+            intptr_t classId = 0;
+            Dart_Handle ALLOW_UNUSED result = Dart_GetObjClassId(handle, &classId);
+            ASSERT(!Dart_IsError(result));
+            result = Dart_GetClassInfo(classId, 0, &libraryId, 0, 0);
+            ASSERT(!Dart_IsError(result));
+            v8SetReturnValue(info, DartHandleProxy::createLibraryProxy(Dart_GetLibraryFromId(libraryId), libraryId, Dart_Null(), false));
+            return;
+        }
+    }
+
+    Dart_Handle result = Dart_Invoke(handle, V8Converter::stringToDart(v8::String::Concat(v8::String::NewFromUtf8(v8Isolate, "get:"), name)), 0, 0);
+    if (Dart_IsError(result)) {
+        // To match JS conventions, we should just return undefined if a
+        // property does not exist rather than throwing.
+        if (Dart_ErrorHasException(result) && isNoSuchMethodError(Dart_ErrorGetException(result)))
+            return;
+        v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+        v8Isolate->ThrowException(v8::String::NewFromUtf8(v8Isolate, Dart_GetError(result)));
+        return;
+    }
+    v8SetReturnValue(info, DartHandleProxy::create(result));
+}
+
+static void namedPropertySetter(v8::Local<v8::String> property, v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<v8::Value>& info)
+{
+    DartScopes scopes(info.Holder());
+    Dart_Handle handle = scopes.handle;
+
+    Dart_Handle dartValue = DartHandleProxy::unwrapValue(value);
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    setReturnValue(info, Dart_Invoke(handle, V8Converter::stringToDart(v8::String::Concat(v8::String::NewFromUtf8(v8Isolate, "set:"), property)), 1, &dartValue));
+}
+
+static void objectQueryProperty(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Integer>& info)
+{
+    DartScopes scopes(info.Holder());
+    Dart_Handle handle = scopes.handle;
+
+    Dart_Handle ret;
+    ASSERT(Dart_IsInstance(handle));
+    v8::String::Utf8Value stringName(name);
+    const char* data = *stringName;
+
+    // Looking up a map key instead of a regular property... as regular dart property names
+    // cannot start with these symbols.
+    if (data[0] == ':' || data[0] == '#') {
+        v8SetReturnValueInt(info, v8::ReadOnly);
+        return;
+    }
+    if (data[0] == '@') {
+        v8SetReturnValueInt(info, v8::DontEnum);
+        return;
+    }
+
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    ret = Dart_Invoke(handle, V8Converter::stringToDart(v8::String::Concat(v8::String::NewFromUtf8(v8Isolate, "get:"), name)), 0, 0);
+    if (Dart_IsError(ret) && !name->Equals(v8::String::NewFromUtf8(v8Isolate, "__proto__"))) {
+        return;
+    }
+    v8SetReturnValueInt(info, 0);
+}
+
+static void objectPropertyEnumerator(const v8::PropertyCallbackInfo<v8::Array>& info)
+{
+    DartScopes scopes(info.Holder());
+    Dart_Handle handle = scopes.handle;
+
+    ASSERT(Dart_IsInstance(handle));
+
+    Dart_Handle typeHandle = Dart_InstanceGetType(handle);
+
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    v8::Local<v8::Array> properties = v8::Array::New(v8Isolate);
+    intptr_t count = 0;
+    Dart_Handle mapKeys = getEncodedMapKeyList(handle);
+    if (Dart_IsList(mapKeys)) {
+        // If the object has map keys, add them all as properties at the start
+        // of the list. This aids for debugging although it risks confusing
+        // users.
+        intptr_t length = 0;
+        Dart_ListLength(mapKeys, &length);
+        for (intptr_t i = 0; i < length; i++) {
+            properties->Set(count, V8Converter::stringToV8(Dart_ListGetAt(mapKeys, i)));
+            count++;
+        }
+    }
+
+    Dart_Handle instanceFields = Dart_GetInstanceFields(handle);
+    intptr_t length = 0;
+    Dart_ListLength(instanceFields, &length);
+    for (intptr_t i = 0; i < length; i += 2) {
+        properties->Set(count, DartHandleProxy::create(
+            Dart_ListGetAt(instanceFields, i)));
+        count++;
+    }
+
+    while (!Dart_IsError(typeHandle) && !Dart_IsNull(typeHandle)) {
+        addFunctionNames(typeHandle, properties, &count, true, true);
+        typeHandle = Dart_GetSupertype(typeHandle);
+    }
+
+    properties->Set(count, v8::String::NewFromUtf8(v8Isolate, "@staticFields"));
+    count++;
+    properties->Set(count, v8::String::NewFromUtf8(v8Isolate, "@library"));
+    count++;
+    v8SetReturnValue(info, properties);
+}
+
+static void indexedGetter(uint32_t index, const v8::PropertyCallbackInfo<v8::Value>& info)
+{
+    DartScopes scopes(info.Holder());
+    Dart_Handle handle = scopes.handle;
+
+    Dart_Handle ret = 0;
+    if (Dart_IsList(handle))
+        ret = Dart_ListGetAt(handle, index);
+    else
+        ret = Dart_Null();
+
+    setReturnValue(info, ret);
+}
+
+static void indexedSetter(uint32_t index, v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<v8::Value>& info)
+{
+    DartScopes scopes(info.Holder());
+    Dart_Handle handle = scopes.handle;
+
+    Dart_Handle ret = 0;
+    if (Dart_IsList(handle))
+        ret = Dart_ListSetAt(handle, index, DartHandleProxy::unwrapValue(value));
+    else
+        ret = Dart_Null();
+
+    setReturnValue(info, ret);
+}
+
+static void indexedEnumerator(const v8::PropertyCallbackInfo<v8::Array>& info)
+{
+    DartScopes scopes(info.Holder());
+    Dart_Handle handle = scopes.handle;
+
+    intptr_t length = 0;
+    if (Dart_IsList(handle))
+        Dart_ListLength(handle, &length);
+
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    v8::Local<v8::Array> indexes = v8::Array::New(v8Isolate, length);
+    for (int i = 0; i < length; i++)
+        indexes->Set(i, v8::Integer::New(v8Isolate, i));
+
+    v8SetReturnValue(info, indexes);
+}
+
+static v8::Local<v8::ObjectTemplate> setupInstanceTemplate(v8::Local<v8::FunctionTemplate> proxyTemplate)
+{
+    v8::Local<v8::ObjectTemplate> instanceTemplate = proxyTemplate->InstanceTemplate();
+    instanceTemplate->SetInternalFieldCount(1);
+    return instanceTemplate;
+}
+
+static v8::Local<v8::FunctionTemplate> objectProxyTemplate(Dart_Handle instance)
+{
+    DEFINE_STATIC_LOCAL(FunctionTemplateMap, map, ());
+    Dart_Handle dartType = Dart_InstanceGetType(instance);
+    ASSERT(!Dart_IsError(dartType));
+    Dart_Handle typeNameHandle = Dart_TypeName(dartType);
+    ASSERT(!Dart_IsError(typeNameHandle));
+    v8::Handle<v8::String> typeNameV8 = V8Converter::stringToV8(typeNameHandle);
+    String typeName = toCoreString(typeNameV8);
+    v8::Persistent<v8::FunctionTemplate>* proxyTemplate = map.get(typeName);
+    v8::Local<v8::FunctionTemplate> proxyTemplateLocal;
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    if (!proxyTemplate) {
+        proxyTemplate = new v8::Persistent<v8::FunctionTemplate>(v8Isolate, v8::FunctionTemplate::New(v8Isolate));
+        proxyTemplateLocal = v8::Local<v8::FunctionTemplate>::New(v8Isolate, *proxyTemplate);
+        proxyTemplateLocal->SetClassName(typeNameV8);
+        map.set(typeName, proxyTemplate);
+        v8::Local<v8::ObjectTemplate> instanceTemplate = setupInstanceTemplate(proxyTemplateLocal);
+        instanceTemplate->SetIndexedPropertyHandler(&indexedGetter, &indexedSetter, 0, 0, &indexedEnumerator);
+        instanceTemplate->SetNamedPropertyHandler(&namedPropertyGetter, &namedPropertySetter, &objectQueryProperty, 0, &objectPropertyEnumerator);
+    } else {
+        proxyTemplateLocal = v8::Local<v8::FunctionTemplate>::New(v8Isolate, *proxyTemplate);
+    }
+    return proxyTemplateLocal;
+}
+
+static v8::Local<v8::FunctionTemplate> functionProxyTemplate()
+{
+    DEFINE_STATIC_LOCAL(v8::Persistent<v8::FunctionTemplate>, proxyTemplate, ());
+    v8::Local<v8::FunctionTemplate> proxyTemplateLocal;
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    if (proxyTemplate.IsEmpty()) {
+        proxyTemplate.Reset(v8::Isolate::GetCurrent(), v8::FunctionTemplate::New(v8Isolate));
+        proxyTemplateLocal = v8::Local<v8::FunctionTemplate>::New(v8Isolate, proxyTemplate);
+        proxyTemplateLocal->SetClassName(v8::String::NewFromUtf8(v8Isolate, "[Dart Function]"));
+        v8::Local<v8::ObjectTemplate> instanceTemplate = setupInstanceTemplate(proxyTemplateLocal);
+        instanceTemplate->SetNamedPropertyHandler(&functionNamedPropertyGetter, &functionNamedPropertySetter);
+        instanceTemplate->SetCallAsFunctionHandler(&functionInvocationCallback);
+    } else {
+        proxyTemplateLocal = v8::Local<v8::FunctionTemplate>::New(v8Isolate, proxyTemplate);
+    }
+    return proxyTemplateLocal;
+}
+
+static v8::Local<v8::FunctionTemplate> libraryProxyTemplate(v8::Handle<v8::String> libraryNameV8)
+{
+    DEFINE_STATIC_LOCAL(FunctionTemplateMap, map, ());
+    String typeName = toCoreString(libraryNameV8);
+    v8::Persistent<v8::FunctionTemplate>* proxyTemplate = map.get(typeName);
+    v8::Local<v8::FunctionTemplate> proxyTemplateLocal;
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    if (!proxyTemplate) {
+        proxyTemplate = new v8::Persistent<v8::FunctionTemplate>(v8Isolate, v8::FunctionTemplate::New(v8Isolate));
+        proxyTemplateLocal = v8::Local<v8::FunctionTemplate>::New(v8Isolate, *proxyTemplate);
+        proxyTemplateLocal->SetClassName(libraryNameV8);
+        map.set(typeName, proxyTemplate);
+        v8::Local<v8::ObjectTemplate> instanceTemplate = setupInstanceTemplate(proxyTemplateLocal);
+        instanceTemplate->SetNamedPropertyHandler(&libraryNamedPropertyGetter, &libraryNamedPropertySetter, &libraryQueryProperty, 0, &libraryPropertyEnumerator);
+    } else {
+        proxyTemplateLocal = v8::Local<v8::FunctionTemplate>::New(v8Isolate, *proxyTemplate);
+    }
+    return proxyTemplateLocal;
+}
+
+static v8::Local<v8::FunctionTemplate> typeProxyTemplate(Dart_Handle type)
+{
+    DEFINE_STATIC_LOCAL(FunctionTemplateMap, map, ());
+    Dart_Handle typeNameHandle = Dart_TypeName(type);
+    ASSERT(!Dart_IsError(typeNameHandle));
+    v8::Handle<v8::String> typeNameV8 = V8Converter::stringToV8(typeNameHandle);
+    String typeName = toCoreString(typeNameV8);
+
+    v8::Persistent<v8::FunctionTemplate>* proxyTemplate = map.get(typeName);
+    v8::Local<v8::FunctionTemplate> proxyTemplateLocal;
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    if (!proxyTemplate) {
+        proxyTemplate = new v8::Persistent<v8::FunctionTemplate>(v8Isolate, v8::FunctionTemplate::New(v8Isolate));
+        proxyTemplateLocal = v8::Local<v8::FunctionTemplate>::New(v8Isolate, *proxyTemplate);
+        proxyTemplateLocal->SetClassName(typeNameV8);
+        v8::Local<v8::ObjectTemplate> instanceTemplate = setupInstanceTemplate(proxyTemplateLocal);
+        instanceTemplate->SetNamedPropertyHandler(&typeNamedPropertyGetter, &typeNamedPropertySetter, &typeQueryProperty, 0, &typePropertyEnumerator);
+        instanceTemplate->SetCallAsFunctionHandler(&typeProxyConstructorInvocationCallback);
+        map.set(typeName, proxyTemplate);
+    } else {
+        proxyTemplateLocal = v8::Local<v8::FunctionTemplate>::New(v8Isolate, *proxyTemplate);
+    }
+    return proxyTemplateLocal;
+}
+
+static v8::Local<v8::FunctionTemplate> frameProxyTemplate()
+{
+    DEFINE_STATIC_LOCAL(v8::Persistent<v8::FunctionTemplate>, proxyTemplate, ());
+    v8::Local<v8::FunctionTemplate> proxyTemplateLocal;
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    if (proxyTemplate.IsEmpty()) {
+        proxyTemplate.Reset(v8::Isolate::GetCurrent(), v8::FunctionTemplate::New(v8Isolate));
+        proxyTemplateLocal = v8::Local<v8::FunctionTemplate>::New(v8Isolate, proxyTemplate);
+        proxyTemplateLocal->SetClassName(v8::String::NewFromUtf8(v8Isolate, "[Dart Frame]"));
+        v8::Local<v8::ObjectTemplate> instanceTemplate = setupInstanceTemplate(proxyTemplateLocal);
+        instanceTemplate->SetNamedPropertyHandler(&frameNamedPropertyGetter, &frameNamedPropertySetter, &frameQueryProperty, 0, &framePropertyEnumerator);
+    } else {
+        proxyTemplateLocal = v8::Local<v8::FunctionTemplate>::New(v8Isolate, proxyTemplate);
+    }
+    return proxyTemplateLocal;
+}
+
+v8::Handle<v8::Value> DartHandleProxy::create(Dart_Handle value)
+{
+    v8::Context::Scope scope(DartUtilities::currentV8Context());
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+
+    if (Dart_IsNull(value))
+        return v8::Null(v8Isolate);
+    if (Dart_IsString(value))
+        return V8Converter::stringToV8(value);
+    if (Dart_IsBoolean(value))
+        return V8Converter::booleanToV8(value);
+    if (Dart_IsNumber(value))
+        return V8Converter::numberToV8(value);
+    v8::Local<v8::Object> proxy;
+    // We could unwrap Dart DOM types to native types and then rewrap them as
+    // JS DOM types but currently we choose not to instead returning JS
+    // proxies for the Dart DOM types so that the Dart DOM APIs for DOM types
+    // are exposed in the debugger instead of the JS APIs.
+    // We attempt to get the best of both worlds by providing the method
+    // getJavaScriptType to let debugger APIs treat these Dart proxies for
+    // DOM types like native DOM types for cases such as visual Node
+    // highlighting.
+
+    DartDOMData* domData = DartDOMData::current();
+    // FIXME: refactor code so we do not have to check for Dart_IsFunction.
+    if (DartUtilities::isFunction(domData, value) || Dart_IsFunction(value)) {
+        proxy = functionProxyTemplate()->InstanceTemplate()->NewInstance();
+    } else {
+        ASSERT(Dart_IsInstance(value));
+        proxy = objectProxyTemplate(value)->InstanceTemplate()->NewInstance();
+    }
+    writePointerToProxy(proxy, value);
+    proxy->SetHiddenValue(v8::String::NewFromUtf8(v8Isolate, "dartProxy"), v8::Boolean::New(v8Isolate, true));
+
+    return proxy;
+}
+
+v8::Handle<v8::Value> DartHandleProxy::createTypeProxy(Dart_Handle value, bool showStatics)
+{
+    ASSERT(Dart_IsType(value));
+    v8::Local<v8::Object> proxy = typeProxyTemplate(value)->InstanceTemplate()->NewInstance();
+    writePointerToProxy(proxy, value);
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    proxy->SetHiddenValue(v8::String::NewFromUtf8(v8Isolate, "dartProxy"), v8::Boolean::New(v8Isolate, true));
+    proxy->SetHiddenValue(v8::String::NewFromUtf8(v8Isolate, "showStatics"), v8::Boolean::New(v8Isolate, showStatics));
+    return proxy;
+}
+
+/**
+ * Returns the JavaScript type name following the Chrome debugger conventions
+ * for Dart objects that have natural JavaScript analogs.
+ * This enables visually consistent display of Dart Lists and JavaScript arrays,
+ * functions, and DOM nodes.
+ */
+const char* DartHandleProxy::getJavaScriptType(v8::Handle<v8::Value> value)
+{
+    DartPersistentValue* scriptValue = readPointerFromProxy(value);
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_PersistentHandle handle = scriptValue->value();
+
+    if (Dart_IsInstance(handle)) {
+        if (Dart_IsList(handle))
+            return "array";
+
+        if (DartUtilities::isNode(handle))
+            return "node";
+    }
+
+    return 0;
+}
+
+Node* DartHandleProxy::toNativeNode(v8::Handle<v8::Value> value)
+{
+    DartPersistentValue* scriptValue = readPointerFromProxy(value);
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+
+    Dart_PersistentHandle handle = scriptValue->value();
+    if (!DartUtilities::isNode(handle)) {
+        // Not a DOM node.
+        ASSERT_NOT_REACHED();
+        return 0;
+    }
+    return DartUtilities::dartNodeToNativeNode(handle);
+}
+
+/**
+ * Creates a proxy for a Dart library.
+ * If a string prefix is specified, we similuate that all requests to the library start with
+ * the specified prefix.
+ */
+v8::Handle<v8::Value> DartHandleProxy::createLibraryProxy(Dart_Handle value, intptr_t libraryId, Dart_Handle prefix, bool asGlobal)
+{
+    v8::Context::Scope scope(DartUtilities::currentV8Context());
+    ASSERT(Dart_IsLibrary(value));
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    v8::Handle<v8::String> libraryNameV8 = Dart_IsNull(prefix) ? V8Converter::stringToV8(Dart_GetLibraryURL(libraryId)) : v8::String::NewFromUtf8(v8Isolate, "[Library Prefix]");
+    v8::Local<v8::Object> proxy = libraryProxyTemplate(libraryNameV8)->InstanceTemplate()->NewInstance();
+    writePointerToProxy(proxy, value);
+    proxy->SetHiddenValue(v8::String::NewFromUtf8(v8Isolate, "libraryId"), v8::Number::New(v8Isolate, libraryId));
+    if (Dart_IsString(prefix))
+        proxy->SetHiddenValue(v8::String::NewFromUtf8(v8Isolate, "prefix"), V8Converter::stringToV8(prefix));
+
+    if (asGlobal)
+        proxy->SetHiddenValue(v8::String::NewFromUtf8(v8Isolate, "asGlobal"), v8::Boolean::New(v8Isolate, true));
+
+    proxy->SetHiddenValue(v8::String::NewFromUtf8(v8Isolate, "dartProxy"), v8::Boolean::New(v8Isolate, true));
+    return proxy;
+}
+
+v8::Handle<v8::Value> DartHandleProxy::createLocalScopeProxy(Dart_Handle localVariables)
+{
+    v8::Local<v8::Object> proxy = frameProxyTemplate()->InstanceTemplate()->NewInstance();
+    Dart_Handle localScopeVariableMap = createLocalVariablesMap(localVariables);
+    ASSERT(!Dart_IsError(localScopeVariableMap));
+    writePointerToProxy(proxy, localScopeVariableMap);
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    proxy->SetHiddenValue(v8::String::NewFromUtf8(v8Isolate, "dartProxy"), v8::Boolean::New(v8Isolate, true));
+    return proxy;
+}
+
+v8::Handle<v8::Value> DartHandleProxy::evaluate(Dart_Handle target, Dart_Handle expression, Dart_Handle localVariables)
+{
+    DartDOMData* domData = DartDOMData::current();
+    ASSERT(domData);
+    ASSERT(Dart_IsList(localVariables) || Dart_IsNull(localVariables));
+    v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+    if (V8Converter::stringToV8(expression)->Equals(v8::String::NewFromUtf8(v8Isolate, "@NamesInScope"))) {
+        // Special case: return an object specifying all names that are in
+        // scope for the current target. FIXME: we could handle this a lot more
+        // efficiently given we don't really care what the values of the
+        // variables are just that they are in scope.
+        if (Dart_IsLibrary(target))
+            return DartHandleProxy::createLibraryProxy(target, DartUtilities::libraryHandleToLibraryId(target), Dart_Null(), true);
+        return DartHandleProxy::create(target);
+    }
+
+    Dart_Handle exception = 0;
+    bool ret = DartUtilities::dartToBool(DartUtilities::invokeUtilsMethod("isJsExpression", 1, &expression), exception);
+    ASSERT(!exception);
+    if (ret) {
+        // FIXME(dartbug.com/13468): remove this hacky fallback of invoking JS
+        // code when we believe a JS code fragment generated by the chrome
+        // developer tools was passed to us rather than a fragment of true
+        // Dart code.
+        ASSERT(!v8Isolate->GetCurrentContext().IsEmpty());
+        v8::Handle<v8::Value> result = V8ScriptRunner::compileAndRunInternalScript(V8Converter::stringToV8(expression), v8::Isolate::GetCurrent());
+        return result;
+    }
+
+    bool expectsConsoleApi = DartUtilities::dartToBool(DartUtilities::invokeUtilsMethod("expectsConsoleApi", 1, &expression), exception);
+    ASSERT(!exception);
+    if (expectsConsoleApi) {
+        // Vector of local variables and injected console variables.
+        Vector<Dart_Handle> locals;
+        if (Dart_IsList(localVariables)) {
+            DartUtilities::extractListElements(localVariables, exception, locals);
+            ASSERT(!exception);
+        }
+        // Use JsInterop to proxy all properties and functions defined by
+        // window.console._commandLineAPI
+        v8::Isolate* v8Isolate = v8::Isolate::GetCurrent();
+        v8::Handle<v8::Value> commandLineApiValue = v8Isolate->GetCurrentContext()->Global()->Get(v8::String::NewFromUtf8(v8Isolate, "__commandLineAPI"));
+        ASSERT(commandLineApiValue->IsObject());
+        if (commandLineApiValue->IsObject()) {
+            v8::Handle<v8::Object> commandLineApi = commandLineApiValue.As<v8::Object>();
+            v8::Local<v8::Array> propertyNames = commandLineApi->GetOwnPropertyNames();
+            uint32_t length = propertyNames->Length();
+            ASSERT(length > 0);
+            for (uint32_t i = 0; i < length; i++) {
+                v8::Handle<v8::String> propertyName = propertyNames->Get(i).As<v8::String>();
+                ASSERT(!propertyNames.IsEmpty());
+                v8::Handle<v8::Value> propertyValue = commandLineApi->Get(propertyName);
+
+                Dart_Handle dartValue;
+                if (propertyValue->IsFunction()) {
+                    dartValue = JsInterop::toDart(propertyValue);
+                    // We need to wrap the JsFunction object we get back
+                    // from the vanila JsInterop library so that users can
+                    // call it like a normal Dart function instead of
+                    // having to use the apply method.
+                    dartValue = Dart_Invoke(domData->jsLibrary(), Dart_NewStringFromCString("_wrapAsDebuggerVarArgsFunction"), 1, &dartValue);
+                } else {
+                    dartValue = JsInterop::toDart(propertyValue);
+                }
+                locals.append(V8Converter::stringToDart(propertyName));
+                locals.append(dartValue);
+            }
+        }
+        localVariables = DartUtilities::toList(locals, exception);
+        ASSERT(!exception);
+    }
+
+    Dart_Handle wrapExpressionArgs[2] = { expression, localVariables };
+    Dart_Handle wrappedExpressionTuple =
+        DartUtilities::invokeUtilsMethod("wrapExpressionAsClosure", 2, wrapExpressionArgs);
+    ASSERT(Dart_IsList(wrappedExpressionTuple));
+    Dart_Handle wrappedExpression = Dart_ListGetAt(wrappedExpressionTuple, 0);
+    Dart_Handle wrappedExpressionArgs = Dart_ListGetAt(wrappedExpressionTuple, 1);
+
+    ASSERT(Dart_IsString(wrappedExpression));
+    Dart_Handle closure = Dart_EvaluateExpr(target, wrappedExpression);
+    // There was a parse error. FIXME: consider cleaning up the line numbers in
+    // the error message.
+    if (Dart_IsError(closure))
+        return V8ThrowException::throwException(v8::String::NewFromUtf8(v8Isolate, Dart_GetError(closure)), v8::Isolate::GetCurrent());
+
+    // Invoke the closure passing in the expression arguments specified by
+    // wrappedExpressionTuple.
+    ASSERT(DartUtilities::isFunction(domData, closure));
+    intptr_t length = 0;
+    Dart_ListLength(wrappedExpressionArgs, &length);
+    Vector<Dart_Handle> dartFunctionArgs;
+    for (intptr_t i = 0; i < length; i ++)
+        dartFunctionArgs.append(Dart_ListGetAt(wrappedExpressionArgs, i));
+
+    Dart_Handle result = Dart_InvokeClosure(closure, dartFunctionArgs.size(), dartFunctionArgs.data());
+    if (Dart_IsError(result))
+        return V8ThrowException::throwException(v8::String::NewFromUtf8(v8Isolate, Dart_GetError(result)), v8::Isolate::GetCurrent());
+    return DartHandleProxy::create(result);
+}
+
+}