Dart bindings for WebKit

Source/WebCore/bindings/dart/DartIsolateState.cpp

Index: Source/WebCore/bindings/dart/DartIsolateState.cpp
diff --git a/Source/WebCore/bindings/dart/DartIsolateState.cpp b/Source/WebCore/bindings/dart/DartIsolateState.cpp
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+// Copyright 2011, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "config.h"
+#include "DartIsolateState.h"
+
+#include "DartController.h"
+#include "DartDOMWrapper.h"
+#include "DartUtilities.h"
+
+namespace WebCore {
+
+struct DartIsolateLink {
+    DartIsolateLink(Dart_Isolate isolate, DartIsolateLink* previous)
+        : isolate(isolate), previous(previous) {}
+
+    Dart_Isolate isolate;
+    DartIsolateLink* previous;
+};
+
+DartIsolateLink* DartIsolateState::m_current = 0;
+
+void DartIsolateState::pushLink(Dart_Isolate isolate)
+{
+    m_current = new DartIsolateLink(isolate, m_current);
+}
+
+void DartIsolateState::popLink()
+{
+    DartIsolateLink* previous = m_current->previous;
+    delete m_current;
+    m_current = previous;
+}
+
+// Creates a new isolates and sets it as the current.
+Dart_Isolate DartIsolateState::create(ScriptExecutionContext* context, void* data)
+{
+    if (m_current) {
+        ASSERT(m_current->isolate && m_current->isolate == Dart_CurrentIsolate());
+        Dart_ExitIsolate();
+    }
+    // FIXME: proper error reporting.
+    char* errorMsg = 0;
+    Dart_Isolate isolate = Dart_CreateIsolate(0, data, &errorMsg);
+    pushLink(isolate);
+    ASSERT(Dart_CurrentIsolate() == isolate);
+    DartController::setupDOMEnabledIsolate(context);
+    return isolate;
+}
+
+// Push the given isolate as the current one.
+void DartIsolateState::push(Dart_Isolate isolate)
+{
+    if (m_current) {
+        Dart_Isolate current = Dart_CurrentIsolate();
+        ASSERT(current && m_current->isolate == current);
+        if (current != isolate) {
+            Dart_ExitIsolate();
+            Dart_EnterIsolate(isolate);
+        }
+    } else {
+        ASSERT(!Dart_CurrentIsolate());
+        Dart_EnterIsolate(isolate);
+    }
+    pushLink(isolate);
+}
+
+// Return the currently active isolate.
+Dart_Isolate DartIsolateState::current()
+{
+    ASSERT(m_current && m_current->isolate == Dart_CurrentIsolate());
+    return m_current->isolate;
+}
+
+// Pop the currently active isolate and restore the previous one (if any).
+void DartIsolateState::pop()
+{
+    ASSERT(m_current && m_current->isolate == Dart_CurrentIsolate());
+    DartIsolateLink* previous = m_current->previous;
+    if (previous) {
+        if (previous->isolate != m_current->isolate) {
+            Dart_ExitIsolate();
+            Dart_EnterIsolate(previous->isolate);
+        }
+    } else {
+        Dart_ExitIsolate();
+    }
+    popLink();
+}
+
+// Shutdown the given isolate.
+void DartIsolateState::shutdown(Dart_Isolate isolate)
+{
+    ASSERT(!m_current || m_current->isolate != isolate);
+
+    push(isolate);
+    // FIXME: clear event listeners.
+    // FIXME: clear console messages.
+    DartDOMMap* domMap = DartUtilities::domMapForIsolate(isolate);
+    for (DartDOMMap::iterator it = domMap->begin(); it != domMap->end(); ++it)
+        DartDOMWrapper::derefDOMObject(it->second, it->first);
+    pop();
+
+    if (m_current)
+        Dart_ExitIsolate();
+    Dart_EnterIsolate(isolate);
+    Dart_ShutdownIsolate();
+    DartUtilities::unregisterIsolateContext(isolate);
+    if (m_current)
+        Dart_EnterIsolate(m_current->isolate);
+}
+
+}