Improve Dart Debugger performance and robustness by creating Dart wrappers using the standard SetNa…

Source/bindings/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
@@ skipping 12 matching lines @@
  * 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/dart/DartHandleProxy.h"
 
+#include "DartNode.h"
 #include "bindings/dart/DartScriptValue.h"
 #include "bindings/dart/DartUtilities.h"
 #include "bindings/dart/V8Converter.h"
+#include "bindings/v8/PageScriptDebugServer.h"
+#include "bindings/v8/ScriptController.h"
+#include "bindings/v8/ScriptState.h"
+#include "bindings/v8/V8Binding.h"
+
+#include "wtf/StdLibExtras.h"
 
 #include <dart_debugger_api.h>
 
 namespace WebCore {
 
-static v8::Persistent<v8::FunctionTemplate> proxyTemplate();
+typedef HashMap<String, v8::Persistent<v8::FunctionTemplate> > FunctionTemplateMap;
 
-static DartScriptValue* readPointerFromProxy(v8::Handle<v8::Value> proxy)
+static v8::Persistent<v8::FunctionTemplate> objectProxyTemplate(Dart_Handle instance);
+static v8::Persistent<v8::FunctionTemplate> functionProxyTemplate();
+static v8::Persistent<v8::FunctionTemplate> libraryProxyTemplate();
+static v8::Persistent<v8::FunctionTemplate> typeProxyTemplate(Dart_Handle type);
+static v8::Persistent<v8::FunctionTemplate> frameProxyTemplate();
+
+DartScriptValue* readPointerFromProxy(v8::Handle<v8::Value> proxy)
 {
     void* pointer = proxy.As<v8::Object>()->GetAlignedPointerFromInternalField(0);
     return static_cast<DartScriptValue*>(pointer);
 }
 
 static void weakCallback(v8::Isolate* isolate, v8::Persistent<v8::Object>* proxy, void*)
 {
     delete readPointerFromProxy(*proxy);
     proxy->Dispose(isolate);
 }
 
+static Dart_Handle unwrapValue(v8::Handle<v8::Value> value)
+{
+    if (DartHandleProxy::isDartProxy(value))
+        return Dart_HandleFromPersistent(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_GetClass(library, name))
+        || 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 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 isNode(Dart_Handle type)
+{
+    // We have to check that toNativeNode does not return null because
+    // non-native types can implement the Node interface.
+    Dart_Handle exception = 0;
+    bool ret = DartUtilities::dartToBool(DartUtilities::invokeUtilsMethod("isNode", 1, &type), exception);
+    ASSERT(!exception);
+    if (!ret)
+        return false;
+    if (!DartNode::toNative(type, exception))
+        return false;
+    return true;
+}
+
+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);
+        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;
+        }
+
+        // Strip off the leading typename from constructor name.
+        if (isConstructor)
+            functionName = stripClassName(functionName, Dart_ClassName(handle));
+
+        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(fieldName));
+        *count = *count + 1;
+    }
+}
+
+static v8::Handle<v8::Value> convertResult(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);
+        // return v8::Undefined();
+
+        return v8::ThrowException(v8::String::New(Dart_GetError(result)));
+    }
+    return DartHandleProxy::create(result);
+}
+
+void setDartHandleInternalField(v8::Local<v8::Object> proxy, Dart_Handle value)
+{
+    proxy->SetAlignedPointerInInternalField(0, new DartScriptValue(value));
+    v8::Isolate* isolate = v8::Isolate::GetCurrent();
+    v8::Persistent<v8::Object> persistentHandle = v8::Persistent<v8::Object>::New(isolate, proxy);
+    persistentHandle.MakeWeak<v8::Object, void>(0, &weakCallback);
+}
+
+intptr_t getLibraryId(v8::Local<v8::Object> proxy)
+{
+    return (intptr_t)proxy.As<v8::Object>()->GetHiddenValue(v8::String::NewSymbol("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::Local<v8::Value> prefix = proxy.As<v8::Object>()->GetHiddenValue(v8::String::NewSymbol("prefix"));
+    if (*prefix && prefix->IsString())
+        return V8Converter::stringToDart(prefix);
+    return Dart_Null();
+}
+
+static v8::Handle<v8::Value> functionNamedPropertyGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(info.This());
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+
+    Dart_Handle ret;
+    ASSERT(Dart_IsFunction(handle) || Dart_IsClosure(handle));
+
+    ret = Dart_Invoke(handle, V8Converter::stringToDart(v8::String::Concat(v8::String::New("get:"), name)), 0, 0);
+    if (Dart_IsError(ret) && name->Equals(v8::String::NewSymbol("__proto__")))
+        return v8::Undefined();
+
+    return convertResult(ret);
+}
+
+static v8::Handle<v8::Value> functionNamedPropertySetter(v8::Local<v8::String> property, v8::Local<v8::Value> value, const v8::AccessorInfo& info)
+{
+    return throwError(v8ReferenceError, "Dart functions do not have writeable properties", v8::Isolate::GetCurrent());
+}
+
+static v8::Handle<v8::Value> functionInvocationCallback(v8::Arguments const& args)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(args.Holder());
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+
+    ASSERT(Dart_IsFunction(handle) || Dart_IsClosure(handle));
+    bool isConstructor = false;
+    Dart_FunctionIsConstructor(handle, &isConstructor);
+    if (args.IsConstructCall() != isConstructor) {
+        return throwError(v8ReferenceError,
+            isConstructor ? "Constructor called without new" : "Regular function called as constructor",
+            v8::Isolate::GetCurrent());
+    }
+
+    Vector<Dart_Handle> dartFunctionArgs;
+    for (uint32_t i = 0; i < args.Length(); ++i)
+        dartFunctionArgs.append(unwrapValue(args[i]));
+
+    if (Dart_IsClosure(handle))
+        return convertResult(Dart_InvokeClosure(handle, dartFunctionArgs.size(), dartFunctionArgs.data()));
+    Dart_Handle type = Dart_FunctionOwner(handle);
+    if (isConstructor)
+        // FIXME: this seems like an overly complex way to have to invoke a constructor.
+        return convertResult(
+            Dart_New(type, stripClassName(Dart_FunctionName(handle), Dart_ClassName(type)),
+                dartFunctionArgs.size(), dartFunctionArgs.data()));
+    else
+        return convertResult(
+            Dart_Invoke(type, Dart_FunctionName(handle), dartFunctionArgs.size(), dartFunctionArgs.data()));
+}
+
+static v8::Handle<v8::Value> typeProxyConstructorInvocationCallback(v8::Arguments const& args)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(args.Holder());
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+
+    ASSERT(Dart_IsType(handle));
+
+    if (!args.IsConstructCall())
+        return throwError(v8SyntaxError, "Constructors can only be invoked with 'new'", v8::Isolate::GetCurrent());
+
+    Vector<Dart_Handle> dartFunctionArgs;
+    for (uint32_t i = 0; i < args.Length(); ++i)
+        dartFunctionArgs.append(unwrapValue(args[i]));
+
+    return convertResult(Dart_New(handle, Dart_Null(), dartFunctionArgs.size(), dartFunctionArgs.data()));
+}
+
+void getImportedLibrariesMatchingPrefix(int32_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_debugger_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 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 v8::Handle<v8::Value> libraryNamedPropertyGetterHelper(Dart_Handle library, Dart_Handle dartName, bool* handled)
+{
+    Dart_Handle ret;
+    ret  = Dart_GetField(library, dartName);
+    if (!Dart_IsApiError(ret)) {
+        *handled = true;
+        return convertResult(ret);
+    }
+
+    ret = Dart_GetType(library, dartName, 0, 0);
+    if (!Dart_IsError(ret)) {
+        *handled = true;
+        return DartHandleProxy::createTypeProxy(ret, true);
+    }
+
+    ret = Dart_LookupFunction(library, dartName);
+    if (!Dart_IsNull(ret) && !Dart_IsError(ret)) {
+        *handled = true;
+        return convertResult(ret);
+    }
+    return v8::Undefined();
+}
+
+static v8::Handle<v8::Value> libraryNamedPropertyGetterHelper(v8::Local<v8::String> name,
+    const v8::AccessorInfo& info, bool* handled)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(info.This());
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+
+    Dart_Handle ret;
+    ASSERT(Dart_IsLibrary(handle));
+    intptr_t libraryId = getLibraryId(info.This());
+    Dart_Handle dartName = V8Converter::stringToDart(name);
+    Dart_Handle prefix = getLibraryPrefix(info.This());
+    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++) {
+            v8::Handle<v8::Value> returnValue = libraryNamedPropertyGetterHelper(libraries[i].first, dartName, handled);
+            if (*handled)
+                return returnValue;
+        }
+    } else {
+        v8::Handle<v8::Value> returnValue = libraryNamedPropertyGetterHelper(handle, dartName, handled);
+        if (*handled)
+            return returnValue;
+
+        // 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) {
+            *handled = true;
+            return DartHandleProxy::createLibraryProxy(handle, libraryId, dartName);
+        }
+    }
+
+    if (name->Equals(v8::String::NewSymbol("__proto__"))) {
+        *handled = true;
+        return v8::Null();
+    }
+    return v8::Undefined();
+}
+
+static v8::Handle<v8::Value> libraryNamedPropertyGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info)
+{
+    bool handled = false;
+    v8::Handle<v8::Value> ret = libraryNamedPropertyGetterHelper(name, info, &handled);
+    if (handled)
+        return ret;
+    return v8::ThrowException(v8::Exception::ReferenceError(v8::String::Concat(name, v8::String::New(" is not defined"))));
+}
+
+// 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 v8::Handle<v8::Value> libraryNamedPropertySetter(v8::Local<v8::String> property, v8::Local<v8::Value> value, const v8::AccessorInfo& info)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(info.This());
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+
+    Dart_Handle ret;
+    ASSERT(Dart_IsLibrary(handle));
+    Dart_Handle dartValue = unwrapValue(value);
+    ret = Dart_SetField(handle, V8Converter::stringToDart(property), dartValue);
+    return convertResult(ret);
+}
+
+static v8::Handle<v8::Integer> libraryQueryProperty(v8::Local<v8::String> name, const v8::AccessorInfo& info)
+{
+    bool handled = false;
+    libraryNamedPropertyGetterHelper(name, info, &handled);
+    return handled ? v8Integer(0, info.GetIsolate()) : v8::Handle<v8::Integer>();
+}
+
+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 v8::Handle<v8::Array> libraryPropertyEnumerator(const v8::AccessorInfo& info)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(info.This());
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+
+    intptr_t libraryId = getLibraryId(info.This());
+    ASSERT(Dart_IsLibrary(handle));
+    v8::Local<v8::Array> cachedProperties = info.This().As<v8::Object>()->GetHiddenValue(v8::String::NewSymbol("cache")).As<v8::Array>();
+    if (*cachedProperties)
+        return cachedProperties;
+
+    Dart_Handle prefix = getLibraryPrefix(info.This());
+    bool hasLibraryPrefix = Dart_IsString(prefix);
+
+    v8::Local<v8::Array> properties = v8::Array::New();
+    intptr_t count = 0;
+
+    if (hasLibraryPrefix) {
+        Vector<std::pair<Dart_Handle, intptr_t> > libraries;
+        getImportedLibrariesMatchingPrefix(libraryId, prefix, &libraries);
+        for (intptr_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(
+                    stripTrailingDot(importPrefix)));
+                count++;
+            }
+            bool equals = false;
+        }
+    }
+    info.This()->SetHiddenValue(v8::String::NewSymbol("cache"), properties);
+    return properties;
+}
+
+bool isShowStatics(v8::Handle<v8::Value> value)
+{
+    v8::Local<v8::Value> showStatics = value.As<v8::Object>()->GetHiddenValue(v8::String::NewSymbol("showStatics"));
+    ASSERT(*showStatics && showStatics->IsBoolean());
+    return showStatics->BooleanValue();
+}
+
+static v8::Handle<v8::Value> typeNamedPropertyGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(info.This());
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+
+    Dart_Handle ret;
+    ASSERT(Dart_IsType(handle));
+
+    if (name->Equals(v8::String::NewSymbol("__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.This()))
+            return v8::Null();
+        */
+
+        Dart_Handle supertype = Dart_GetSupertype(handle);
+        if (!Dart_IsNull(supertype))
+            return DartHandleProxy::createTypeProxy(supertype, false);
+        return v8::Null();
+    }
+
+    Dart_Handle dartName = V8Converter::stringToDart(name);
+    ret = Dart_GetField(handle, dartName);
+    if (!Dart_IsError(ret))
+        return convertResult(ret);
+    ret = Dart_LookupFunction(handle, dartName);
+    if (!Dart_IsNull(ret) && !Dart_IsError(ret))
+        return convertResult(ret);
+
+    Dart_Handle typeName = Dart_ClassName(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))
+        return convertResult(ret);
+
+    return v8::ThrowException(v8::Exception::ReferenceError(v8::String::Concat(name, v8::String::New(" is not defined"))));
+}
+
+static v8::Handle<v8::Value> typeNamedPropertySetter(v8::Local<v8::String> property, v8::Local<v8::Value> value, const v8::AccessorInfo& info)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(info.This());
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+
+    Dart_Handle ret;
+    ASSERT(Dart_IsType(handle));
+    Dart_Handle dartValue = unwrapValue(value);
+    ret = Dart_Invoke(handle, V8Converter::stringToDart(v8::String::Concat(v8::String::New("set:"), property)), 1, &dartValue);
+    return convertResult(ret);
+}
+
+static v8::Handle<v8::Integer> typeQueryProperty(v8::Local<v8::String> name, const v8::AccessorInfo& info)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(info.This());
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+
+    Dart_Handle ret;
+    ASSERT(Dart_IsType(handle));
+    if (name->Equals(v8::String::NewSymbol("__proto__"))
+        || typeHasMember(handle, V8Converter::stringToDart(name)))
+        return v8Integer(0, info.GetIsolate());
+    return v8::Handle<v8::Integer>();
+}
+
+static v8::Handle<v8::Array> typePropertyEnumerator(const v8::AccessorInfo& info)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(info.This());
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+    bool showStatics = isShowStatics(info.This());
+
+    ASSERT(Dart_IsType(handle));
+
+    v8::Local<v8::Array> properties = v8::Array::New();
+    intptr_t count = 0;
+    addFunctionNames(handle, properties, &count, !showStatics, false);
+    if (showStatics)
+        addFieldNames(Dart_GetStaticFields(handle), properties, &count);
+
+    return properties;
+}
+
+static v8::Handle<v8::Value> frameNamedPropertyGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(info.This());
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+
+    Dart_Handle dartName = dartName;
+    if (mapContainsKey(handle, V8Converter::stringToDart(name))) {
+        Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+        Dart_Handle indexedGetterOperator = Dart_NewStringFromCString("[]");
+        Dart_Handle dartName = V8Converter::stringToDart(name);
+        return convertResult(Dart_Invoke(handle, indexedGetterOperator, 1, &dartName));
+    }
+    if (name->Equals(v8::String::NewSymbol("this")))
+        return v8::Undefined();
+    return v8::ThrowException(v8::Exception::ReferenceError(v8::String::Concat(name, v8::String::New(" is not defined"))));
+}
+
+static v8::Handle<v8::Value> frameNamedPropertySetter(v8::Local<v8::String> property, v8::Local<v8::Value> value, const v8::AccessorInfo& info)
+{
+    return throwError(v8ReferenceError, "Dart does not yet provide a debugger api for setting local fields", v8::Isolate::GetCurrent());
+}
+
+static v8::Handle<v8::Integer> frameQueryProperty(v8::Local<v8::String> name, const v8::AccessorInfo& info)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(info.This());
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+
+    return mapContainsKey(handle, V8Converter::stringToDart(name)) ? v8Integer(v8::ReadOnly, info.GetIsolate()) : v8::Handle<v8::Integer>();
+}
+
+static v8::Handle<v8::Array> framePropertyEnumerator(const v8::AccessorInfo& info)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(info.This());
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle keyList = getMapKeyList(Dart_HandleFromPersistent(scriptValue->value()));
+    ASSERT(!Dart_IsError(keyList));
+    ASSERT(Dart_IsList(keyList));
+
+    intptr_t length = 0;
+    Dart_ListLength(keyList, &length);
+    v8::Local<v8::Array> properties = v8::Array::New(length);
+    for (intptr_t i = 0; i < length; i ++)
+        properties->Set(i, V8Converter::stringToV8(Dart_ListGetAt(keyList, i)));
+    return properties;
+}
+
+static v8::Handle<v8::Value> namedPropertyGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(info.This());
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+
+    ASSERT(Dart_IsInstance(handle));
+    if (name->Equals(v8::String::NewSymbol("__proto__")))
+        return DartHandleProxy::createTypeProxy(Dart_InstanceGetType(handle), false);
+
+    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.
+        return convertResult(
+            lookupValueForEncodedMapKey(handle, V8Converter::stringToDart(name)));
+    }
+    // Prefix for metadata used only by the Dart Editor debugger.
+    if (data[0] == '@') {
+        if (name->Equals(v8::String::New("@staticFields")))
+            return DartHandleProxy::createTypeProxy(Dart_InstanceGetType(handle), true);
+    }
+
+    return convertResult(Dart_Invoke(handle, V8Converter::stringToDart(v8::String::Concat(v8::String::New("get:"), name)), 0, 0));
+}
+
+static v8::Handle<v8::Value> namedPropertySetter(v8::Local<v8::String> property, v8::Local<v8::Value> value, const v8::AccessorInfo& info)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(info.This());
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+
+    Dart_Handle dartValue = unwrapValue(value);
+    return convertResult(Dart_Invoke(handle, V8Converter::stringToDart(v8::String::Concat(v8::String::New("set:"), property)), 1, &dartValue));
+}
+
+static v8::Handle<v8::Integer> objectQueryProperty(v8::Local<v8::String> name, const v8::AccessorInfo& info)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(info.This());
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+
+    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] == '#')
+        return v8Integer(v8::ReadOnly, info.GetIsolate());
+    if (data[0] =='@')
+        return v8Integer(v8::DontEnum, info.GetIsolate());
+
+    ret = Dart_Invoke(handle, V8Converter::stringToDart(v8::String::Concat(v8::String::New("get:"), name)), 0, 0);
+    if (Dart_IsError(ret)) {
+        if (name->Equals(v8::String::NewSymbol("__proto__")))
+            return v8Integer(0, info.GetIsolate());
+        return v8::Handle<v8::Integer>();
+    }
+    return v8Integer(0, info.GetIsolate());
+}
+
+static v8::Handle<v8::Array> objectPropertyEnumerator(const v8::AccessorInfo& info)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(info.This());
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+
+    ASSERT(Dart_IsInstance(handle));
+
+    Dart_Handle typeHandle;
+    if (Dart_IsInstance(handle))
+        typeHandle = Dart_InstanceGetType(handle);
+    else
+        typeHandle = handle;
+
+    v8::Local<v8::Array> properties = v8::Array::New();
+    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::New("@staticFields"));
+    count++;
+    return properties;
+}
+
+static v8::Handle<v8::Value> indexedGetter(uint32_t index, const v8::AccessorInfo& info)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(info.This());
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+
+    Dart_Handle ret = 0;
+    if (Dart_IsList(handle))
+        ret = Dart_ListGetAt(handle, index);
+    else
+        ret = Dart_Null();
+
+    return convertResult(ret);
+}
+
+static v8::Handle<v8::Value> indexedSetter(uint32_t index, v8::Local<v8::Value> value, const v8::AccessorInfo& info)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(info.This());
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+
+    Dart_Handle ret = 0;
+    if (Dart_IsList(handle))
+        ret = Dart_ListSetAt(handle, index, unwrapValue(value));
+    else
+        ret = Dart_Null();
+
+    return convertResult(ret);
+}
+
+static v8::Handle<v8::Array> indexedEnumerator(const v8::AccessorInfo& info)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(info.This());
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+
+    intptr_t length = 0;
+    if (Dart_IsList(handle))
+        Dart_ListLength(handle, &length);
+
+    v8::Local<v8::Array> indexes = v8::Array::New(length);
+    for (int i = 0; i < length; i++)
+        indexes->Set(i, v8::Integer::New(i));
+
+    return indexes;
+}
+
+static v8::Local<v8::ObjectTemplate> setupInstanceTemplate(v8::Persistent<v8::FunctionTemplate> proxyTemplate)
+{
+    v8::Local<v8::ObjectTemplate> instanceTemplate = proxyTemplate->InstanceTemplate();
+    instanceTemplate->SetInternalFieldCount(1);
+    return instanceTemplate;
+}
+
+static v8::Persistent<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_ClassName(dartType);
+    ASSERT(!Dart_IsError(typeNameHandle));
+    v8::Handle<v8::String> typeNameV8 = V8Converter::stringToV8(typeNameHandle);
+    String typeName = toWebCoreString(typeNameV8);
+    v8::Persistent<v8::FunctionTemplate> proxyTemplate = map.get(typeName);
+
+    if (proxyTemplate.IsEmpty()) {
+        proxyTemplate = v8::Persistent<v8::FunctionTemplate>::New(v8::Isolate::GetCurrent(), v8::FunctionTemplate::New());
+        proxyTemplate->SetClassName(typeNameV8);
+        map.set(typeName, proxyTemplate);
+        v8::Local<v8::ObjectTemplate> instanceTemplate = setupInstanceTemplate(proxyTemplate);
+        instanceTemplate->SetIndexedPropertyHandler(&indexedGetter, &indexedSetter, 0, 0, &indexedEnumerator);
+        instanceTemplate->SetNamedPropertyHandler(&namedPropertyGetter, &namedPropertySetter, &objectQueryProperty, 0, &objectPropertyEnumerator);
+    }
+    return proxyTemplate;
+}
+
+static v8::Persistent<v8::FunctionTemplate> functionProxyTemplate()
+{
+    static v8::Persistent<v8::FunctionTemplate> proxyTemplate;
+    if (proxyTemplate.IsEmpty()) {
+        proxyTemplate = v8::Persistent<v8::FunctionTemplate>::New(v8::Isolate::GetCurrent(), v8::FunctionTemplate::New());
+        proxyTemplate->SetClassName(v8::String::New("[Dart Function]"));
+        v8::Local<v8::ObjectTemplate> instanceTemplate = setupInstanceTemplate(proxyTemplate);
+        instanceTemplate->SetNamedPropertyHandler(&functionNamedPropertyGetter, &functionNamedPropertySetter);
+        instanceTemplate->SetCallAsFunctionHandler(&functionInvocationCallback);
+    }
+    return proxyTemplate;
+}
+
+static v8::Persistent<v8::FunctionTemplate> libraryProxyTemplate()
+{
+    static v8::Persistent<v8::FunctionTemplate> proxyTemplate;
+    if (proxyTemplate.IsEmpty()) {
+        proxyTemplate = v8::Persistent<v8::FunctionTemplate>::New(v8::Isolate::GetCurrent(), v8::FunctionTemplate::New());
+        proxyTemplate->SetClassName(v8::String::New("[Dart Library]"));
+        v8::Local<v8::ObjectTemplate> instanceTemplate = setupInstanceTemplate(proxyTemplate);
+        instanceTemplate->SetNamedPropertyHandler(&libraryNamedPropertyGetter, &libraryNamedPropertySetter, &libraryQueryProperty, 0, &libraryPropertyEnumerator);
+    }
+    return proxyTemplate;
+}
+
+static v8::Persistent<v8::FunctionTemplate> typeProxyTemplate(Dart_Handle type)
+{
+    DEFINE_STATIC_LOCAL(FunctionTemplateMap, map, ());
+    Dart_Handle typeNameHandle = Dart_ClassName(type);
+    ASSERT(!Dart_IsError(typeNameHandle));
+    v8::Handle<v8::String> typeNameV8 = V8Converter::stringToV8(typeNameHandle);
+    String typeName = toWebCoreString(typeNameV8);
+
+    v8::Persistent<v8::FunctionTemplate> proxyTemplate = map.get(typeName);
+    if (proxyTemplate.IsEmpty()) {
+        proxyTemplate = v8::Persistent<v8::FunctionTemplate>::New(v8::Isolate::GetCurrent(), v8::FunctionTemplate::New());
+        proxyTemplate->SetClassName(typeNameV8);
+        v8::Local<v8::ObjectTemplate> instanceTemplate = setupInstanceTemplate(proxyTemplate);
+        instanceTemplate->SetNamedPropertyHandler(&typeNamedPropertyGetter, &typeNamedPropertySetter, &typeQueryProperty, 0, &typePropertyEnumerator);
+        instanceTemplate->SetCallAsFunctionHandler(&typeProxyConstructorInvocationCallback);
+        map.set(typeName, proxyTemplate);
+    }
+    return proxyTemplate;
+}
+
+static v8::Persistent<v8::FunctionTemplate> frameProxyTemplate()
+{
+    static v8::Persistent<v8::FunctionTemplate> proxyTemplate;
+    if (proxyTemplate.IsEmpty()) {
+        proxyTemplate = v8::Persistent<v8::FunctionTemplate>::New(v8::Isolate::GetCurrent(), v8::FunctionTemplate::New());
+        proxyTemplate->SetClassName(v8::String::New("[Dart Frame]"));
+        v8::Local<v8::ObjectTemplate> instanceTemplate = setupInstanceTemplate(proxyTemplate);
+        instanceTemplate->SetNamedPropertyHandler(&frameNamedPropertyGetter, &frameNamedPropertySetter, &frameQueryProperty, 0, &framePropertyEnumerator);
+    }
+    return proxyTemplate;
+}
+
 v8::Handle<v8::Value> DartHandleProxy::create(Dart_Handle value)
 {
     v8::Context::Scope scope(DartUtilities::currentV8Context());
 
     if (Dart_IsNull(value))
         return v8::Null();
     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 = proxyTemplate()->InstanceTemplate()->NewInstance();
-    proxy->SetAlignedPointerInInternalField(0, new DartScriptValue(value));
-    v8::Isolate* isolate = v8::Isolate::GetCurrent();
-    v8::Persistent<v8::Object> persistentHandle = v8::Persistent<v8::Object>::New(isolate, proxy);
-    persistentHandle.MakeWeak<v8::Object, void>(0, &weakCallback);
-    proxy->Set(v8::String::New("isProxy"), v8::Boolean::New(true));
+    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.
+
+    if (Dart_IsFunction(value) || Dart_IsClosure(value))
+        proxy = functionProxyTemplate()->InstanceTemplate()->NewInstance();
+    else {
+        ASSERT(Dart_IsInstance(value));
+        proxy = objectProxyTemplate(value)->InstanceTemplate()->NewInstance();
+    }
+    setDartHandleInternalField(proxy, value);
+    proxy->SetHiddenValue(v8::String::NewSymbol("dartProxy"), v8::Boolean::New(true));
+
     return proxy;
 }
 
-v8::Handle<v8::Value> DartHandleProxy::createForLibrary(intptr_t libraryId)
-{
-    Dart_Handle libraryURL = Dart_GetLibraryURL(libraryId);
-    ASSERT(!Dart_IsError(libraryURL));
-    Dart_Handle library = Dart_LookupLibrary(libraryURL);
-    v8::Handle<v8::Object> libraryProxy = create(library)->ToObject();
-    libraryProxy->SetHiddenValue(v8::String::New("libraryId"), v8::Number::New(libraryId));
-    return libraryProxy;
-}
-
-class DartReceiverScope {
-public:
-    DartReceiverScope(const v8::Arguments& args)
-        : m_receiver(readPointerFromProxy(args[0]))
-        , m_isolateScope(m_receiver->isolate())
-        , m_apiScope()
-    {
-    }
-
-    Dart_Handle receiver() { return Dart_HandleFromPersistent(m_receiver->value()); }
-
-private:
-    DartScriptValue* m_receiver;
-    DartIsolateScope m_isolateScope;
-    DartApiScope m_apiScope;
-};
-
-static v8::Persistent<v8::FunctionTemplate> proxyTemplate()
-{
-    static v8::Persistent<v8::FunctionTemplate> proxyTemplate;
-    if (proxyTemplate.IsEmpty()) {
-        proxyTemplate = v8::Persistent<v8::FunctionTemplate>::New(v8::Isolate::GetCurrent(), v8::FunctionTemplate::New());
-        v8::Local<v8::ObjectTemplate> instanceTemplate = proxyTemplate->InstanceTemplate();
-        instanceTemplate->SetInternalFieldCount(1);
-    }
-    return proxyTemplate;
-}
-
-static Dart_Handle unwrapValue(v8::Handle<v8::Value> value)
-{
-    if (proxyTemplate()->HasInstance(value))
-        return Dart_HandleFromPersistent(readPointerFromProxy(value)->value());
+v8::Handle<v8::Value> DartHandleProxy::createTypeProxy(Dart_Handle value, bool showStatics)
+{
+    ASSERT(Dart_IsType(value));
+    v8::Local<v8::Object> proxy = typeProxyTemplate(value)->InstanceTemplate()->NewInstance();
+    setDartHandleInternalField(proxy, value);
+    proxy->SetHiddenValue(v8::String::NewSymbol("dartProxy"), v8::Boolean::New(true));
+    proxy->SetHiddenValue(v8::String::NewSymbol("showStatics"), v8::Boolean::New(showStatics));
+    return proxy;
+}
+
+bool DartHandleProxy::isDartProxy(v8::Handle<v8::Value> value)
+{
+    if (value->IsObject()) {
+        v8::Local<v8::Value> hiddenValue = value.As<v8::Object>()->GetHiddenValue(v8::String::NewSymbol("dartProxy"));
+        return *hiddenValue && hiddenValue->IsBoolean();
+    }
+    return false;
+}
+
+/**
+ * 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)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(value);
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
+
+    if (Dart_IsInstance(handle)) {
+        if (Dart_IsList(handle))
+            return "array";
+
+        if (Dart_IsFunction(handle))
+            return "function";
+
+        if (isNode(handle))
+            return "node";
+    }
+
+    return 0;
+}
+
+Node* DartHandleProxy::toNativeNode(v8::Handle<v8::Value> value)
+{
+    DartScriptValue* scriptValue = readPointerFromProxy(value);
+    ASSERT(scriptValue->isIsolateAlive());
+    DartIsolateScope scope(scriptValue->isolate());
+    DartApiScope apiScope;
+    Dart_Handle handle = Dart_HandleFromPersistent(scriptValue->value());
     Dart_Handle exception = 0;
-    Dart_Handle handle = V8Converter::toDart(value, exception);
+    Node* node = DartNode::toNative(handle, exception);
     ASSERT(!exception);
-    return handle;
-}
-
-static v8::Handle<v8::Value> convertResult(Dart_Handle result)
-{
-    if (Dart_IsError(result)) {
-        // Consider wrapping not as a string, but as dedicated
-        // exception wrapper.
-        return v8::String::New("<Exception thrown>");
-    }
-    return DartHandleProxy::create(result);
-}
-
-// --- Objects ----
-
-static v8::Handle<v8::Value> instanceGetClass(const v8::Arguments& args)
-{
-    DartReceiverScope scope(args);
-    return convertResult(Dart_InstanceGetClass(scope.receiver()));
-}
-
-// --- Lists ---
-
-static v8::Handle<v8::Value> isList(const v8::Arguments& args)
-{
-    DartReceiverScope scope(args);
-    return v8::Boolean::New(Dart_IsList(scope.receiver()));
-}
-
-static v8::Handle<v8::Value> listGetAt(const v8::Arguments& args)
-{
-    DartReceiverScope scope(args);
-    return convertResult(Dart_ListGetAt(scope.receiver(), args[1]->Int32Value()));
-}
-
-static v8::Handle<v8::Value> listSetAt(const v8::Arguments& args)
-{
-    DartReceiverScope scope(args);
-    return convertResult(Dart_ListSetAt(scope.receiver(), args[1]->Int32Value(), unwrapValue(args[2])));
-}
-
-// --- Classes and Interfaces ---
-
-static v8::Handle<v8::Value> className(const v8::Arguments& args)
-{
-    DartReceiverScope scope(args);
-    return convertResult(Dart_ClassName(scope.receiver()));
-}
-
-static v8::Handle<v8::Value> classGetLibrary(const v8::Arguments& args)
-{
-    DartReceiverScope scope(args);
-    return convertResult(Dart_ClassGetLibrary(scope.receiver()));
-}
-
-static v8::Handle<v8::Value> getSuperclass(const v8::Arguments& args)
-{
-    DartReceiverScope scope(args);
-    return convertResult(Dart_GetSuperclass(scope.receiver()));
-}
-
-// --- Function and Variable Declarations ---
-
-static v8::Handle<v8::Value> getFunctionNames(const v8::Arguments& args)
-{
-    DartReceiverScope scope(args);
-    return V8Converter::listToV8(Dart_GetFunctionNames(scope.receiver()));
-}
-
-static v8::Handle<v8::Value> getClassNames(const v8::Arguments& args)
-{
-    DartReceiverScope scope(args);
-    Dart_Handle classNames = Dart_LibraryGetClassNames(scope.receiver());
-    ASSERT(!Dart_IsError(classNames) && !Dart_IsNull(classNames));
-    return V8Converter::listToV8(classNames);
-}
-
-static v8::Handle<v8::Value> lookupClass(const v8::Arguments& args)
-{
-    DartReceiverScope scope(args);
-    return convertResult(Dart_GetClass(scope.receiver(), V8Converter::stringToDart(args[1])));
-}
-
-static v8::Handle<v8::Value> lookupFunction(const v8::Arguments& args)
-{
-    DartReceiverScope scope(args);
-
-    Dart_Handle function = Dart_LookupFunction(scope.receiver(), V8Converter::stringToDart(args[1]));
-    ASSERT(!Dart_IsError(function) && !Dart_IsNull(function));
-
-    Dart_Handle result;
-    UNUSED_PARAM(result);
-
-    bool isAbstract;
-    result = Dart_FunctionIsAbstract(function, &isAbstract);
-    ASSERT(!Dart_IsError(result));
-    bool isStatic;
-    result = Dart_FunctionIsStatic(function, &isStatic);
-    ASSERT(!Dart_IsError(result));
-    bool isConstructor;
-    result = Dart_FunctionIsConstructor(function, &isConstructor);
-    ASSERT(!Dart_IsError(result));
-    bool isGetter;
-    result = Dart_FunctionIsGetter(function, &isGetter);
-    ASSERT(!Dart_IsError(result));
-    bool isSetter;
-    result = Dart_FunctionIsSetter(function, &isSetter);
-    ASSERT(!Dart_IsError(result));
-    int64_t fixedParameterCount;
-    int64_t optionalParamerterCount;
-    result = Dart_FunctionParameterCounts(function, &fixedParameterCount, &optionalParamerterCount);
-    ASSERT(!Dart_IsError(result));
-
-    v8::Handle<v8::Object> description = v8::Object::New();
-    description->Set(v8::String::New("isAbstract"), v8::Boolean::New(isAbstract));
-    description->Set(v8::String::New("isStatic"), v8::Boolean::New(isStatic));
-    description->Set(v8::String::New("isConstructor"), v8::Boolean::New(isConstructor));
-    description->Set(v8::String::New("isGetter"), v8::Boolean::New(isGetter));
-    description->Set(v8::String::New("isSetter"), v8::Boolean::New(isSetter));
-    description->Set(v8::String::New("fixedParameterCount"), v8::Integer::New(fixedParameterCount));
-    description->Set(v8::String::New("optionalParamerterCount"), v8::Integer::New(optionalParamerterCount));
-    return description;
-}
-
-static v8::Handle<v8::Value> getVariableNames(const v8::Arguments& args)
-{
-    DartReceiverScope scope(args);
-    return V8Converter::listToV8(Dart_GetVariableNames(scope.receiver()));
-}
-
-static v8::Handle<v8::Value> lookupVariable(const v8::Arguments& args)
-{
-    DartReceiverScope scope(args);
-    Dart_Handle variable = Dart_LookupVariable(scope.receiver(), V8Converter::stringToDart(args[1]));
-    ASSERT(!Dart_IsError(variable) && !Dart_IsNull(variable));
-
-    Dart_Handle result;
-    UNUSED_PARAM(result);
-
-    bool isStatic;
-    result = Dart_VariableIsStatic(variable, &isStatic);
-    ASSERT(!Dart_IsError(result));
-    bool isFinal;
-    result = Dart_VariableIsFinal(variable, &isFinal);
-    ASSERT(!Dart_IsError(result));
-
-    v8::Local<v8::Object> description = v8::Object::New();
-    description->Set(v8::String::New("isStatic"), v8::Boolean::New(isStatic));
-    description->Set(v8::String::New("isFinal"), v8::Boolean::New(isFinal));
-    return description;
-}
-
-// --- Constructors, Methods, and Fields ---
-
-static v8::Handle<v8::Value> invoke(const v8::Arguments& args)
-{
-    DartReceiverScope scope(args);
-    Vector<Dart_Handle> dartFunctionArgs;
-    v8::Handle<v8::Array> v8FunctionArgs = args[2].As<v8::Array>();
-    for (uint32_t i = 0; i < v8FunctionArgs->Length(); ++i)
-        dartFunctionArgs.append(unwrapValue(v8FunctionArgs->Get(i)));
-    return convertResult(Dart_Invoke(scope.receiver(), V8Converter::stringToDart(args[1]), dartFunctionArgs.size(), dartFunctionArgs.data()));
-}
-
-static v8::Handle<v8::Value> dartNew(const v8::Arguments& args)
-{
-    DartReceiverScope scope(args);
-    Vector<Dart_Handle> dartConstructorArgs;
-    v8::Handle<v8::Array> v8ConstructorArgs = args[2].As<v8::Array>();
-    for (uint32_t i = 0; i < v8ConstructorArgs->Length(); ++i)
-        dartConstructorArgs.append(unwrapValue(v8ConstructorArgs->Get(i)));
-    return convertResult(Dart_New(scope.receiver(), V8Converter::stringToDart(args[1]), dartConstructorArgs.size(), dartConstructorArgs.data()));
-}
-
-static v8::Handle<v8::Value> getField(const v8::Arguments& args)
-{
-    DartReceiverScope scope(args);
-
-    return convertResult(Dart_GetField(scope.receiver(), V8Converter::stringToDart(args[1])));
-}
-
-static v8::Handle<v8::Value> setField(const v8::Arguments& args)
-{
-    DartReceiverScope scope(args);
-    v8::Handle<v8::Array> v8FunctionArgs = args[2].As<v8::Array>();
-    ASSERT(v8FunctionArgs->Length() == 1);
-    return convertResult(Dart_SetField(scope.receiver(), V8Converter::stringToDart(args[1]), unwrapValue(v8FunctionArgs->Get(0))));
-}
-
-// --- Scripts and Libraries ---
-
-static v8::Handle<v8::Value> libraryName(const v8::Arguments& args)
-{
-    DartReceiverScope scope(args);
-    return convertResult(Dart_LibraryName(scope.receiver()));
-}
-
-static v8::Handle<v8::Value> libraryUrl(const v8::Arguments& args)
-{
-    DartReceiverScope scope(args);
-    return convertResult(Dart_LibraryUrl(scope.receiver()));
-}
-
-static v8::Handle<v8::Value> libraryImports(const v8::Arguments& args)
-{
-    DartReceiverScope scope(args);
-    int32_t libraryId = args[0].As<v8::Object>()->GetHiddenValue(v8::String::New("libraryId"))->Int32Value();
-    Dart_Handle imports = Dart_GetLibraryImports(libraryId);
-    ASSERT(!Dart_IsError(imports));
-    intptr_t length = 0;
-    Dart_ListLength(imports, &length);
-    v8::Handle<v8::Array> result = v8::Array::New();
-    for (intptr_t i = 0; i < length; i += 2) {
-        Dart_Handle prefix = Dart_ListGetAt(imports, i);
-        result->Set(i, DartHandleProxy::create(prefix));
-        Dart_Handle importedLibraryIdHandle = Dart_ListGetAt(imports, i + 1);
-        ASSERT(Dart_IsInteger(importedLibraryIdHandle));
-        int64_t importedLibraryId;
-        Dart_IntegerToInt64(importedLibraryIdHandle, &importedLibraryId);
-        result->Set(i + 1, DartHandleProxy::createForLibrary(importedLibraryId));
-    }
-    return result;
-}
-
-void DartHandleProxy::getMirrorAPI(v8::Handle<v8::Object> container)
-{
-    V8Scope v8scope;
-    container->Set(v8::String::New("instanceGetClass"), v8::FunctionTemplate::New(&instanceGetClass)->GetFunction());
-    container->Set(v8::String::New("isList"), v8::FunctionTemplate::New(&isList)->GetFunction());
-    container->Set(v8::String::New("listGetAt"), v8::FunctionTemplate::New(&listGetAt)->GetFunction());
-    container->Set(v8::String::New("listSetAt"), v8::FunctionTemplate::New(&listSetAt)->GetFunction());
-    container->Set(v8::String::New("className"), v8::FunctionTemplate::New(&className)->GetFunction());
-    container->Set(v8::String::New("classGetLibrary"), v8::FunctionTemplate::New(&classGetLibrary)->GetFunction());
-    container->Set(v8::String::New("getSuperclass"), v8::FunctionTemplate::New(&getSuperclass)->GetFunction());
-    container->Set(v8::String::New("getFunctionNames"), v8::FunctionTemplate::New(&getFunctionNames)->GetFunction());
-    container->Set(v8::String::New("getClassNames"), v8::FunctionTemplate::New(&getClassNames)->GetFunction());
-    container->Set(v8::String::New("lookupFunction"), v8::FunctionTemplate::New(&lookupFunction)->GetFunction());
-    container->Set(v8::String::New("lookupClass"), v8::FunctionTemplate::New(&lookupClass)->GetFunction());
-    container->Set(v8::String::New("getVariableNames"), v8::FunctionTemplate::New(&getVariableNames)->GetFunction());
-    container->Set(v8::String::New("lookupVariable"), v8::FunctionTemplate::New(&lookupVariable)->GetFunction());
-    container->Set(v8::String::New("invoke"), v8::FunctionTemplate::New(&invoke)->GetFunction());
-    container->Set(v8::String::New("dartNew"), v8::FunctionTemplate::New(&dartNew)->GetFunction());
-    container->Set(v8::String::New("getField"), v8::FunctionTemplate::New(&getField)->GetFunction());
-    container->Set(v8::String::New("setField"), v8::FunctionTemplate::New(&setField)->GetFunction());
-    container->Set(v8::String::New("libraryName"), v8::FunctionTemplate::New(&libraryName)->GetFunction());
-    container->Set(v8::String::New("libraryUrl"), v8::FunctionTemplate::New(&libraryUrl)->GetFunction());
-    container->Set(v8::String::New("libraryImports"), v8::FunctionTemplate::New(&libraryImports)->GetFunction());
-}
-
-}
+    return node;
+}
+
+/**
+ * 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, int32_t libraryId, Dart_Handle prefix)
+{
+    v8::Context::Scope scope(DartUtilities::currentV8Context());
+    ASSERT(Dart_IsLibrary(value));
+    v8::Local<v8::Object> proxy = libraryProxyTemplate()->InstanceTemplate()->NewInstance();
+    setDartHandleInternalField(proxy, value);
+    proxy->SetHiddenValue(v8::String::NewSymbol("libraryId"), v8::Number::New(libraryId));
+    if (Dart_IsString(prefix))
+        proxy->SetHiddenValue(v8::String::NewSymbol("prefix"), V8Converter::stringToV8(prefix));
+
+    proxy->SetHiddenValue(v8::String::NewSymbol("dartProxy"), v8::Boolean::New(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));
+    setDartHandleInternalField(proxy, localScopeVariableMap);
+    proxy->SetHiddenValue(v8::String::NewSymbol("dartProxy"), v8::Boolean::New(true));
+    return proxy;
+}
+
+}