Dart bindings for WebKit

Source/WebCore/bindings/dart/DartController.cpp

+// Copyright (c) 2009, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "config.h"
+#include "DartController.h"
+
+#include "DOMWindow.h"
+#include "DartApplicationLoader.h"
+#include "DartBuiltinLibrarySource.h"
+#include "DartClassInfo.h"
+#include "DartDOMLibrarySource.h"
+#include "DartDOMWindow.h"
+#include "DartDOMWrapper.h"
+#include "DartFlags.h"
+#include "DartIsolateState.h"
+#include "DartUtilities.h"
+#include "Document.h"
+#include "Frame.h"
+#include "IDBPendingTransactionMonitor.h"
+#include "JavaScriptController.h"
+#include "Page.h"
+#include "PageGroup.h"
+#include "ScriptExecutionContext.h"
+#include "Settings.h"
+#include "StorageNamespace.h"
+
+#include "npruntime_impl.h"
+#include <bindings/npruntime.h>
+
+namespace WebCore {
+
+static void initDOMIsolate()
+{
+    DartApiScope dartApiScope;
+
+    // Create the dom library.
+    Dart_Handle dom = Dart_LoadLibrary(Dart_NewString(DartUtilities::domLibraryName), Dart_NewString("#library(\"Dom\");"));
+    ASSERT(!Dart_IsError(dom));
+    Dart_LibraryImportLibrary(dom, Dart_LookupLibrary(Dart_NewString("dart:coreimpl")));
+    // FIXME: add return value checks.
+    Dart_LoadSource(dom, Dart_NewString("DOMExtensions"), Dart_NewString(dartDOMLibrarySource));
+    Dart_CreateNativeWrapperClass(dom, Dart_NewString("DOMWrapperBase"), DartDOMWrapper::wrapperNativeFieldCount());
+
+    // Inject builtin library to forward core functionality to dom.
+    // FIXME: We need to provide something for non-DOM isolates as well.
+    Dart_Handle core = Dart_LookupLibrary(Dart_NewString("dart:core"));
+    Dart_LoadSource(core, Dart_NewString("dart:builtin"), Dart_NewString(dartBuiltinLibrarySource));
+    Dart_LibraryImportLibrary(core, dom);
+
+    DartClassInfo::registerClasses(dom);
+}
+
+DartPerScriptState::DartPerScriptState(Document* document, NPObject* layoutTestController)
+    : m_dartApplicationLoader(adoptRef(new DartApplicationLoader(document, layoutTestController)))
+    , m_isolate(DartIsolateState::create(document, m_dartApplicationLoader.get()))
+{
+    initDOMIsolate();
+    isolateToDartApplicationLoaderMap().set(m_isolate, m_dartApplicationLoader.get());
+    // DartIsolateState::create pushes newly create isolate, undo it.
+    DartIsolateState::pop();
+}
+
+DartPerScriptState::~DartPerScriptState()
+{
+    *DartUtilities::recursionForIsolate(m_isolate) = 0;
+    isolateToDartApplicationLoaderMap().remove(m_isolate);
+    DartIsolateState::shutdown(m_isolate);
+}
+
+DartController::DartController(Frame* frame)
+    : m_frame(frame)
+    , m_states()
+    , m_layoutTestController(0)
+{
+    // The DartController's constructor must be called in the Frame's
+    // constructor, so it can properly maintain the unit of related
+    // browsing contexts.
+
+    // The DartController must be created after the frame's loader and
+    // tree nodes are initialized.
+    ASSERT(frame->loader());
+    ASSERT(frame->tree());
+}
+
+void DartController::clearWindowShell()
+{
+    m_states.clear();
+}
+
+class PostMessageTask : public ScriptExecutionContext::Task {
+public:
+    PostMessageTask(Dart_Isolate destinationIsolate, Dart_Port destinationPort, Dart_Port replyPort, Dart_Message message)
+        : m_destinationIsolate(destinationIsolate)
+        , m_destinationPort(destinationPort)
+        , m_replyPort(replyPort)
+        , m_message(message) { }
+
+    ~PostMessageTask()
+    {
+        free(m_message);
+    }
+
+    virtual void performTask(ScriptExecutionContext* context)
+    {
+        // FIXME: one shouldn't trust isFullDomIsolate as another
+        // isolate with the same address might be allocated. Apparently better
+        // way would be to maintain a way to tell all the tasks that they are
+        // cancelled from now on. For example, we may maintain a list of all
+        // pending tasks and iterate over it.
+        // destinationIsolate might have been shut down before.
+        if (!DartUtilities::isFullDomIsolate(m_destinationIsolate))
+            return;
+        DartIsolateState::Scope scope(m_destinationIsolate);
+        DartApiScope apiScope;
+        Dart_Handle result = Dart_HandleMessage(m_destinationPort, m_replyPort, m_message);
+        if (Dart_IsError(result))
+            DartUtilities::reportProblem(context, result);
+    }
+
+private:
+    Dart_Isolate m_destinationIsolate;
+    Dart_Port m_destinationPort;
+    Dart_Port m_replyPort;
+    Dart_Message m_message;
+};
+
+static bool postMessageCallback(Dart_Isolate destinationIsolate, Dart_Port destinationPort, Dart_Port replyPort, Dart_Message message)
+{
+    ASSERT(DartUtilities::isFullDomIsolate(destinationIsolate));
+    ScriptExecutionContext* destinationContext = DartUtilities::isolateContext(destinationIsolate);
+    destinationContext->postTask(adoptPtr(new PostMessageTask(destinationIsolate, destinationPort, replyPort, message)));
+    return true;
+}
+
+static void closePortCallback(Dart_Isolate, Dart_Port)
+{
+}
+
+void DartController::setupDOMEnabledIsolate(ScriptExecutionContext* context)
+{
+    ASSERT(context);
+    Dart_SetMessageCallbacks(&postMessageCallback, &closePortCallback);
+    DartUtilities::registerIsolateContext(Dart_CurrentIsolate(), context);
+}
+
+bool DartController::initializeIsolateCallback(void* data, char** errorMsg)
+{
+    Dart_Isolate isolate = Dart_CreateIsolate(0, data, errorMsg);
+    if (!isolate)
+        return false;
+
+    DartApiScope dartApiScope;
+
+    // It's safe to reinitialize DOM in all isolates: unless Dart isolate is
+    // registered with DartUtilities::registerIsolatecContext, it's DOM functionality
+    // will be disabled: we won't be able to resolve top level accessors.
+    initDOMIsolate();
+
+    DartApplicationLoader* dartApplicationLoader = reinterpret_cast<DartApplicationLoader*>(data);
+    // FIXME: when DartVM has shutdown callback, we'll be able to deref it.
+    dartApplicationLoader->ref();
+
+    ASSERT(!dartApplicationLoader->isLoadingMainIsolate());
+    dartApplicationLoader->reinjectSources();
+
+    return true;
+}
+
+void DartController::initVMIfNeeded()
+{
+    static bool hasBeenInitialized = false;
+    if (hasBeenInitialized)
+        return;
+
+    int argc = DartFlags::count();
+    const char** argv = const_cast<const char**>(DartFlags::flags());
+    Dart_SetVMFlags(argc, argv);
+    Dart_Initialize(&initializeIsolateCallback);
+    hasBeenInitialized = true;
+}
+
+bool DartController::isScriptTypeSupported(const String& mimeType)
+{
+    DEFINE_STATIC_LOCAL(HashSet<String>, types, ());
+    if (types.isEmpty()) {
+        types.add("application/dart");
+        types.add("application/dart-app");
+        types.add("application/dart-script");
+    }
+    return !mimeType.isEmpty() && types.contains(mimeType);
+}
+
+void DartController::evaluate(const ScriptSourceCode& sourceCode)
+{
+    if (!m_frame->page()->settings()->isDartEnabled())
+        return;
+
+    initVMIfNeeded();
+
+    // FIXME: it may make sense to ensure that we'll never call evaluate more than once for the same script tag.
+    DartPerScriptState* state = new DartPerScriptState(frame()->document(), m_layoutTestController);
+    ASSERT(state->isolate());
+    m_states.append(adoptPtr(state));
+
+    DartIsolateState::Scope scope(state->isolate());
+    state->dartApplicationLoader()->load(sourceCode.url(), sourceCode.source());
+}
+
+void DartController::bindToWindowObject(Frame*, const String& key, NPObject* object)
+{
+    // FIXME: production code should not know anything about layoutTestController.
+    if (key != "layoutTestController")
+        return;
+
+    // FIXME: proper management of lifetime.
+    ASSERT(m_states.isEmpty());
+    m_layoutTestController = object;
+}
+
+Dart_Handle DartController::callFunction(Dart_Handle function, int argc, Dart_Handle* argv)
+{
+    // FIXME: Introduce Dart variant of V8GCController::checkMemoryUsage();
+    const int kMaxRecursionDepth = 22;
+
+    int* recursion = DartUtilities::recursionForCurrentIsolate();
+
+    if (*recursion >= kMaxRecursionDepth)
+        return Dart_Error("Maximum call stack size exceeded");
+
+    // FIXME: implement InspectorInstrumentationCookie stuff a la v8.
+    (*recursion)++;
+    Dart_Handle result = Dart_InvokeClosure(function, argc, argv);
+    (*recursion)--;
+
+    // Release the storage mutex if applicable.
+    didLeaveScriptContext(*recursion);
+
+    // Handle fatal error in Dart VM a la v8.
+
+    return result;
+}
+
+void DartController::didLeaveScriptContext(int recursion)
+{
+    // FIXME: common to v8, should be factored out.
+    Page* page = m_frame->page();
+    if (!page)
+        return;
+#if ENABLE(INDEXED_DATABASE)
+    // If we've just left a script context and indexed database has been
+    // instantiated, we must let its transaction coordinator know so it can terminate
+    // any not-yet-started transactions.
+    IDBPendingTransactionMonitor::abortPendingTransactions();
+#endif // ENABLE(INDEXED_DATABASE)
+    // If we've just left a top level script context and local storage has been
+    // instantiated, we must ensure that any storage locks have been freed.
+    // Per http://dev.w3.org/html5/spec/Overview.html#storage-mutex
+    if (recursion)
+        return;
+    if (page->group().hasLocalStorage())
+        page->group().localStorage()->unlock();
+}
+
+DartController* DartController::retrieve(Frame* frame)
+{
+    if (!frame)
+        return 0;
+    // FIXME: check if can execute Dart scripts.
+    if (!frame->script()->javaScript()->canExecuteScripts(NotAboutToExecuteScript))
+        return 0;
+    return frame->script()->dart();
+}
+
+DartController* DartController::retrieve(ScriptExecutionContext* context)
+{
+    if (!context || !context->isDocument())
+        return 0;
+    return retrieve(static_cast<Document*>(context)->frame());
+}
+
+}