1 files changed, 99 insertions, 0 deletions
diff --git a/Source/WebCore/bindings/v8/V8PerContextData.h b/Source/WebCore/bindings/v8/V8PerContextData.h
new file mode 100644
index 000000000..c8cd6a5c6
--- /dev/null
+++ b/Source/WebCore/bindings/v8/V8PerContextData.h
@@ -0,0 +1,99 @@
+/*
+ * 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.
+ */
+
+#ifndef V8PerContextData_h
+#define V8PerContextData_h
+
+#include "OwnHandle.h"
+#include "WrapperTypeInfo.h"
+#include <v8.h>
+#include <wtf/HashMap.h>
+#include <wtf/PassOwnPtr.h>
+
+namespace WebCore {
+
+class V8PerContextData {
+public:
+    static PassOwnPtr<V8PerContextData> create(v8::Handle<v8::Context> context)
+    {
+        return adoptPtr(new V8PerContextData(context));
+    }
+
+    ~V8PerContextData()
+    {
+        dispose();
+    }
+
+    bool init();
+
+    // To create JS Wrapper objects, we create a cache of a 'boiler plate'
+    // object, and then simply Clone that object each time we need a new one.
+    // This is faster than going through the full object creation process.
+    v8::Local<v8::Object> createWrapperFromCache(WrapperTypeInfo* type)
+    {
+        v8::Persistent<v8::Object> boilerplate = m_wrapperBoilerplates.get(type);
+        return !boilerplate.IsEmpty() ? boilerplate->Clone() : createWrapperFromCacheSlowCase(type);
+    }
+
+    v8::Local<v8::Function> constructorForType(WrapperTypeInfo* type)
+    {
+        v8::Persistent<v8::Function> function = m_constructorMap.get(type);
+        if (!function.IsEmpty())
+            return v8::Local<v8::Function>::New(function);
+        return constructorForTypeSlowCase(type);
+    }
+
+private:
+    explicit V8PerContextData(v8::Handle<v8::Context> context)
+        : m_context(context)
+    {
+    }
+
+    void dispose();
+
+    v8::Local<v8::Object> createWrapperFromCacheSlowCase(WrapperTypeInfo*);
+    v8::Local<v8::Function> constructorForTypeSlowCase(WrapperTypeInfo*);
+
+    // For each possible type of wrapper, we keep a boilerplate object.
+    // The boilerplate is used to create additional wrappers of the same type.
+    typedef WTF::HashMap<WrapperTypeInfo*, v8::Persistent<v8::Object> > WrapperBoilerplateMap;
+    WrapperBoilerplateMap m_wrapperBoilerplates;
+
+    typedef WTF::HashMap<WrapperTypeInfo*, v8::Persistent<v8::Function> > ConstructorMap;
+    ConstructorMap m_constructorMap;
+
+    v8::Handle<v8::Context> m_context;
+    OwnHandle<v8::Value> m_errorPrototype;
+    OwnHandle<v8::Value> m_objectPrototype;
+};
+
+} // namespace WebCore
+
+#endif // V8PerContextData_h