Import Dart bindings as of Blink r188698. This merely copies the files over and does not attach any…

sky/engine/bindings-dart/core/dart/DartGCController.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/DartGCController.h"
+
+#include "core/HTMLNames.h"
+#include "bindings/core/dart/DartDOMData.h"
+#include "bindings/core/dart/DartDOMWrapper.h"
+#include "bindings/core/dart/DartEventListener.h"
+#include "bindings/core/dart/DartUtilities.h"
+#include "core/dom/ActiveDOMObject.h"
+#include "core/dom/Attr.h"
+#include "core/dom/Document.h"
+#include "core/dom/Node.h"
+#include "core/frame/LocalDOMWindow.h"
+#include "core/html/HTMLImageElement.h"
+
+#include <wtf/Vector.h>
+
+namespace blink {
+
+typedef HashMap<Node*, Dart_WeakReferenceSet> WeakReferenceSetForRootMap;
+
+static Node* calculateRootNode(Node*);
+static void collectEventListenerWrappers(EventTarget*, Dart_WeakReferenceSet);
+
+static void createWeakReferenceSetForNode(
+    DartDOMData* domData,
+    Dart_WeakReferenceSetBuilder setBuilder,
+    Node* node,
+    Dart_WeakPersistentHandle wrapper,
+    WeakReferenceSetForRootMap* weakReferenceSetForRootMap)
+{
+    Dart_WeakReferenceSet weakReferenceSet = 0;
+    ASSERT(node);
+
+    Node* root = 0;
+    if (node->inDocument() || (node->hasTagName(HTMLNames::imgTag) && static_cast<HTMLImageElement*>(node)->hasPendingActivity())) {
+        root = &node->document();
+    } else {
+        root = calculateRootNode(node);
+        if (!root)
+            return;
+    }
+    ASSERT(root);
+
+    Document* document = static_cast<Document*>(domData->scriptExecutionContext());
+    if (root == document) {
+        weakReferenceSet = domData->documentWeakReferenceSet();
+        Dart_AppendToWeakReferenceSet(weakReferenceSet, wrapper, wrapper);
+    } else {
+        WeakReferenceSetForRootMap::const_iterator weakReferenceSetIterator = weakReferenceSetForRootMap->find(root);
+        if (weakReferenceSetIterator != weakReferenceSetForRootMap->end()) {
+            weakReferenceSet = weakReferenceSetIterator->value;
+            Dart_AppendToWeakReferenceSet(weakReferenceSet, wrapper, wrapper);
+        }
+        else {
+            weakReferenceSet = Dart_NewWeakReferenceSet(setBuilder, wrapper, wrapper);
+            weakReferenceSetForRootMap->set(root, weakReferenceSet);
+        }
+    }
+    EventTarget* eventTarget = node;
+    if (eventTarget->hasEventListeners())
+        collectEventListenerWrappers(node, weakReferenceSet);
+}
+
+static void collectRetainedActiveDOMObjectWrappers(DartDOMData* domData, Dart_WeakReferenceSet set)
+{
+    DartMessagePortMap* messagePortMap = domData->messagePortMap();
+    for (DartMessagePortMap::const_iterator it = messagePortMap->begin(); it != messagePortMap->end(); ++it) {
+        MessagePort* messagePort = it->key;
+        if (messagePort->isEntangled() || messagePort->hasPendingActivity()) {
+            Dart_AppendValueToWeakReferenceSet(set, it->value);
+        }
+    }
+}
+
+static Node* calculateRootNode(Node* node)
+{
+    Node* root = node;
+    if (node->isAttributeNode()) {
+        root = static_cast<Attr*>(node)->ownerElement();
+        // If the attribute has no element, no need to put it in the group,
+        // because it'll always be a group of 1.
+        if (!root)
+            return 0;
+    } else {
+        while (Node* parent = root->parentOrShadowHostOrTemplateHostNode())
+            root = parent;
+    }
+    return root;
+}
+
+static void collectEventListenerWrappers(EventTarget* eventTarget, Dart_WeakReferenceSet weakReferenceSet)
+{
+    EventListenerIterator iterator(eventTarget);
+    while (EventListener* listener = iterator.nextListener()) {
+        if (static_cast<int>(listener->type()) != DartEventListenerType)
+            continue;
+        DartEventListener* dartListener = static_cast<DartEventListener*>(listener);
+        if (dartListener->isolate() != Dart_CurrentIsolate())
+            continue;
+        Dart_AppendValueToWeakReferenceSet(weakReferenceSet, dartListener->listenerObject());
+    }
+}
+
+void DartGCController::prologueCallback()
+{
+    Dart_EnterScope();
+
+    DartDOMData* domData = DartDOMData::current();
+    ASSERT(domData->isDOMEnabled());
+    ASSERT(domData->reachableWeakHandle());
+
+    // Setup weak reference set builder.
+    Dart_WeakReferenceSetBuilder setBuilder = Dart_NewWeakReferenceSetBuilder();
+    ASSERT(setBuilder);
+    domData->setWeakReferenceSetBuilder(setBuilder);
+
+    // Setup root <=> weak_reference_set map.
+    WeakReferenceSetForRootMap weakReferenceSetForRootMap;
+    domData->setWeakReferenceSetForRootMap(&weakReferenceSetForRootMap);
+
+    // Create dedicated weak reference set for a document.
+    // ActiveDOMObjects with pending activity and active Message ports
+    // will be added to this set.
+    ASSERT(domData->scriptExecutionContext()->isDocument());
+    Document* document = static_cast<Document*>(domData->scriptExecutionContext());
+    Dart_WeakReferenceSet documentWeakReferenceSet =
+        Dart_NewWeakReferenceSet(setBuilder, domData->reachableWeakHandle(), 0);
+    domData->setDocumentWeakReferenceSet(documentWeakReferenceSet);
+    weakReferenceSetForRootMap.set(document, documentWeakReferenceSet);
+
+    // Now visit all the prolog weak handles.
+    Dart_Handle ALLOW_UNUSED result = Dart_VisitPrologueWeakHandles(prologueWeakHandleCallback);
+    collectRetainedActiveDOMObjectWrappers(domData, documentWeakReferenceSet);
+}
+
+void DartGCController::epilogueCallback()
+{
+    Dart_ExitScope();
+}
+
+void DartGCController::prologueWeakHandleCallback(void* isolateCallbackData, Dart_WeakPersistentHandle obj, intptr_t numNativeFields, intptr_t* nativeFields)
+{
+    if (!numNativeFields)
+        return;
+    ASSERT(numNativeFields == DartDOMWrapper::NativeFieldCount);
+
+    DartDOMData* domData = reinterpret_cast<DartDOMData*>(isolateCallbackData);
+    ASSERT(domData->isDOMEnabled());
+
+    intptr_t cid = nativeFields[DartDOMWrapper::NativeTypeIndex];
+    void* nativeObject = reinterpret_cast<void*>(nativeFields[DartDOMWrapper::NativeImplementationIndex]);
+    const DartWrapperTypeInfo& typeInfo = DartWebkitClassInfo[cid];
+    ASSERT(typeInfo.toNode);
+    Node* node = typeInfo.toNode(nativeObject);
+    if (node) {
+        Dart_WeakReferenceSetBuilder setBuilder = domData->weakReferenceSetBuilder();
+        WeakReferenceSetForRootMap* weakReferenceSetForRootMap = domData->weakReferenceSetForRootMap();
+        createWeakReferenceSetForNode(domData, setBuilder, node, obj, weakReferenceSetForRootMap);
+        return;
+    }
+    ASSERT(typeInfo.toEventTarget);
+    EventTarget* eventTarget = typeInfo.toEventTarget(nativeObject);
+    if (eventTarget) {
+        if (eventTarget->hasEventListeners()) {
+            Dart_WeakReferenceSetBuilder setBuilder = domData->weakReferenceSetBuilder();
+            Dart_WeakReferenceSet set = Dart_NewWeakReferenceSet(setBuilder, obj, 0);
+
+            collectEventListenerWrappers(eventTarget, set);
+        }
+    }
+    ASSERT(typeInfo.toActiveDOMObject);
+    ActiveDOMObject* activeDOMObject = typeInfo.toActiveDOMObject(nativeObject);
+    if (activeDOMObject && activeDOMObject->hasPendingActivity()) {
+        Dart_WeakReferenceSet documentWeakReferenceSet = domData->documentWeakReferenceSet();
+        Dart_AppendValueToWeakReferenceSet(documentWeakReferenceSet, obj);
+    }
+}
+
+}