--- /dev/null
+/*
+ * Copyright (C) 2011 Apple 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:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 Handle_h
+#define Handle_h
+
+#include "HandleTypes.h"
+
+namespace JSC {
+
+/*
+ A Handle is a smart pointer that updates automatically when the garbage
+ collector moves the object to which it points.
+
+ The base Handle class represents a temporary reference to a pointer whose
+ lifetime is guaranteed by something else.
+*/
+
+template <class T> class Handle;
+
+// Creating a JSValue Handle is invalid
+template <> class Handle<JSValue>;
+
+// Forward declare WeakGCMap
+template<typename KeyType, typename MappedType, typename FinalizerCallback, typename HashArg, typename KeyTraitsArg> class WeakGCMap;
+
+class HandleBase {
+ template <typename T> friend class Weak;
+ friend class HandleHeap;
+ friend struct JSCallbackObjectData;
+ template <typename KeyType, typename MappedType, typename FinalizerCallback, typename HashArg, typename KeyTraitsArg> friend class WeakGCMap;
+
+public:
+ bool operator!() const { return !m_slot || !*m_slot; }
+
+ // This conversion operator allows implicit conversion to bool but not to other integer types.
+ typedef JSValue (HandleBase::*UnspecifiedBoolType);
+ operator UnspecifiedBoolType*() const { return (m_slot && *m_slot) ? reinterpret_cast<UnspecifiedBoolType*>(1) : 0; }
+
+protected:
+ HandleBase(HandleSlot slot)
+ : m_slot(slot)
+ {
+ }
+
+ void swap(HandleBase& other) { std::swap(m_slot, other.m_slot); }
+
+ HandleSlot slot() const { return m_slot; }
+ void setSlot(HandleSlot slot)
+ {
+ m_slot = slot;
+ }
+
+private:
+ HandleSlot m_slot;
+};
+
+template <typename Base, typename T> struct HandleConverter {
+ T* operator->()
+ {
+#if ENABLE(JSC_ZOMBIES)
+ ASSERT(!static_cast<const Base*>(this)->get() || !static_cast<const Base*>(this)->get()->isZombie());
+#endif
+ return static_cast<Base*>(this)->get();
+ }
+ const T* operator->() const
+ {
+#if ENABLE(JSC_ZOMBIES)
+ ASSERT(!static_cast<const Base*>(this)->get() || !static_cast<const Base*>(this)->get()->isZombie());
+#endif
+ return static_cast<const Base*>(this)->get();
+ }
+
+ T* operator*()
+ {
+#if ENABLE(JSC_ZOMBIES)
+ ASSERT(!static_cast<const Base*>(this)->get() || !static_cast<const Base*>(this)->get()->isZombie());
+#endif
+ return static_cast<Base*>(this)->get();
+ }
+ const T* operator*() const
+ {
+#if ENABLE(JSC_ZOMBIES)
+ ASSERT(!static_cast<const Base*>(this)->get() || !static_cast<const Base*>(this)->get()->isZombie());
+#endif
+ return static_cast<const Base*>(this)->get();
+ }
+};
+
+template <typename Base> struct HandleConverter<Base, Unknown> {
+ Handle<JSObject> asObject() const;
+ bool isObject() const { return jsValue().isObject(); }
+ bool getNumber(double number) const { return jsValue().getNumber(number); }
+ UString getString(ExecState*) const;
+ bool isUndefinedOrNull() const { return jsValue().isUndefinedOrNull(); }
+
+private:
+ JSValue jsValue() const
+ {
+#if ENABLE(JSC_ZOMBIES)
+ ASSERT(!static_cast<const Base*>(this)->get() || !static_cast<const Base*>(this)->get().isZombie());
+#endif
+ return static_cast<const Base*>(this)->get();
+ }
+};
+
+template <typename T> class Handle : public HandleBase, public HandleConverter<Handle<T>, T> {
+public:
+ template <typename A, typename B> friend class HandleConverter;
+ typedef typename HandleTypes<T>::ExternalType ExternalType;
+ template <typename U> Handle(Handle<U> o)
+ {
+ typename HandleTypes<T>::template validateUpcast<U>();
+ setSlot(o.slot());
+ }
+
+ void swap(Handle& other) { HandleBase::swap(other); }
+
+ ExternalType get() const { return HandleTypes<T>::getFromSlot(this->slot()); }
+
+protected:
+ Handle(HandleSlot slot = 0)
+ : HandleBase(slot)
+ {
+ }
+
+private:
+ friend class HandleHeap;
+
+ static Handle<T> wrapSlot(HandleSlot slot)
+ {
+ return Handle<T>(slot);
+ }
+};
+
+template <typename Base> Handle<JSObject> HandleConverter<Base, Unknown>::asObject() const
+{
+ return Handle<JSObject>::wrapSlot(static_cast<const Base*>(this)->slot());
+}
+
+template <typename T, typename U> inline bool operator==(const Handle<T>& a, const Handle<U>& b)
+{
+ return a.get() == b.get();
+}
+
+template <typename T, typename U> inline bool operator==(const Handle<T>& a, U* b)
+{
+ return a.get() == b;
+}
+
+template <typename T, typename U> inline bool operator==(T* a, const Handle<U>& b)
+{
+ return a == b.get();
+}
+
+template <typename T, typename U> inline bool operator!=(const Handle<T>& a, const Handle<U>& b)
+{
+ return a.get() != b.get();
+}
+
+template <typename T, typename U> inline bool operator!=(const Handle<T>& a, U* b)
+{
+ return a.get() != b;
+}
+
+template <typename T, typename U> inline bool operator!=(T* a, const Handle<U>& b)
+{
+ return a != b.get();
+}
+
+template <typename T, typename U> inline bool operator!=(const Handle<T>& a, JSValue b)
+{
+ return a.get() != b;
+}
+
+template <typename T, typename U> inline bool operator!=(JSValue a, const Handle<U>& b)
+{
+ return a != b.get();
+}
+
+}
+
+#endif
projects / apple / javascriptcore.git / blobdiff