Added Dartium changes onto 45.0.2454.104

Source/bindings/core/dart/DartStringCache.cpp

Index: Source/bindings/core/dart/DartStringCache.cpp
diff --git a/Source/bindings/core/dart/DartStringCache.cpp b/Source/bindings/core/dart/DartStringCache.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..81bb378073a1b923e30fa53be7b176384b6367fd
--- /dev/null
+++ b/Source/bindings/core/dart/DartStringCache.cpp
@@ -0,0 +1,103 @@
+// Copyright 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/DartStringCache.h"
+
+#include "bindings/core/dart/DartDOMData.h"
+#include "bindings/core/dart/DartUtilities.h"
+
+namespace blink {
+
+DartStringCache::DartStringCache()
+{
+    m_lastStringImpl = nullptr;
+    m_lastDartString = 0;
+}
+
+void DartStringCache::clearWeakHandles()
+{
+    Dart_Isolate isolate = Dart_CurrentIsolate();
+    for (StringCache::iterator it = m_stringCache.begin(); it != m_stringCache.end(); ++it) {
+        it->key->deref();
+        Dart_DeleteWeakPersistentHandle(isolate, it->value);
+    }
+    m_stringCache.clear();
+    m_lastStringImpl = nullptr;
+    m_lastDartString = 0;
+}
+
+Dart_WeakPersistentHandle DartStringCache::getSlow(StringImpl* stringImpl, bool autoDartScope)
+{
+    ASSERT(stringImpl);
+
+    Dart_WeakPersistentHandle cachedString = m_stringCache.get(stringImpl);
+    if (cachedString) {
+        m_lastStringImpl = stringImpl;
+        m_lastDartString = cachedString;
+        return cachedString;
+    }
+
+    if (!autoDartScope)
+        Dart_EnterScope();
+
+    ASSERT(stringImpl);
+    Dart_Handle newString = DartUtilities::stringImplToDartString(stringImpl);
+    ASSERT(!Dart_IsError(newString));
+
+    intptr_t peerSize = stringImpl->sizeInBytes();
+    Dart_WeakPersistentHandle wrapper = Dart_NewWeakPersistentHandle(newString, stringImpl, peerSize, handleFinalizer);
+
+    stringImpl->ref();
+    m_stringCache.set(stringImpl, wrapper);
+
+    m_lastStringImpl = stringImpl;
+    m_lastDartString = wrapper;
+
+    if (!autoDartScope)
+        Dart_ExitScope();
+
+    return wrapper;
+}
+
+void DartStringCache::handleFinalizer(void* isolateCallbackData, Dart_WeakPersistentHandle handle, void* peer)
+{
+    StringImpl* stringImpl = reinterpret_cast<StringImpl*>(peer);
+    DartDOMData* domData = reinterpret_cast<DartDOMData*>(isolateCallbackData);
+    DartStringCache& stringCache = domData->stringCache();
+    Dart_WeakPersistentHandle ALLOW_UNUSED cached = stringCache.m_stringCache.take(stringImpl);
+    ASSERT(handle == cached);
+    if (stringCache.m_lastDartString == handle) {
+        stringCache.m_lastStringImpl = nullptr;
+        stringCache.m_lastDartString = 0;
+    }
+    stringImpl->deref();
+}
+
+}