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+/*
+ * Copyright (C) 2004, 2008, 2009 Apple Inc. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+
+#ifndef Protect_h
+#define Protect_h
+
+#include "Collector.h"
+#include "JSValue.h"
+
+namespace JSC {
+
+ inline void gcProtect(JSCell* val)
+ {
+ Heap::heap(val)->protect(val);
+ }
+
+ inline void gcUnprotect(JSCell* val)
+ {
+ Heap::heap(val)->unprotect(val);
+ }
+
+ inline void gcProtectNullTolerant(JSCell* val)
+ {
+ if (val)
+ gcProtect(val);
+ }
+
+ inline void gcUnprotectNullTolerant(JSCell* val)
+ {
+ if (val)
+ gcUnprotect(val);
+ }
+
+ inline void gcProtect(JSValue value)
+ {
+ if (value && value.isCell())
+ gcProtect(value.asCell());
+ }
+
+ inline void gcUnprotect(JSValue value)
+ {
+ if (value && value.isCell())
+ gcUnprotect(value.asCell());
+ }
+
+ // FIXME: Share more code with RefPtr template? The only differences are the ref/deref operation
+ // and the implicit conversion to raw pointer
+ template <class T> class ProtectedPtr {
+ public:
+ ProtectedPtr() : m_ptr(0) {}
+ ProtectedPtr(T* ptr);
+ ProtectedPtr(const ProtectedPtr&);
+ ~ProtectedPtr();
+
+ template <class U> ProtectedPtr(const ProtectedPtr<U>&);
+
+ T* get() const { return m_ptr; }
+ operator T*() const { return m_ptr; }
+ operator JSValue() const { return JSValue(m_ptr); }
+ T* operator->() const { return m_ptr; }
+
+ operator bool() const { return m_ptr; }
+ bool operator!() const { return !m_ptr; }
+
+ ProtectedPtr& operator=(const ProtectedPtr&);
+ ProtectedPtr& operator=(T*);
+
+ private:
+ T* m_ptr;
+ };
+
+ class ProtectedJSValue {
+ public:
+ ProtectedJSValue() {}
+ ProtectedJSValue(JSValue value);
+ ProtectedJSValue(const ProtectedJSValue&);
+ ~ProtectedJSValue();
+
+ template <class U> ProtectedJSValue(const ProtectedPtr<U>&);
+
+ JSValue get() const { return m_value; }
+ operator JSValue() const { return m_value; }
+ JSValue operator->() const { return m_value; }
+
+ operator bool() const { return m_value; }
+ bool operator!() const { return !m_value; }
+
+ ProtectedJSValue& operator=(const ProtectedJSValue&);
+ ProtectedJSValue& operator=(JSValue);
+
+ private:
+ JSValue m_value;
+ };
+
+ template <class T> inline ProtectedPtr<T>::ProtectedPtr(T* ptr)
+ : m_ptr(ptr)
+ {
+ gcProtectNullTolerant(m_ptr);
+ }
+
+ template <class T> inline ProtectedPtr<T>::ProtectedPtr(const ProtectedPtr& o)
+ : m_ptr(o.get())
+ {
+ gcProtectNullTolerant(m_ptr);
+ }
+
+ template <class T> inline ProtectedPtr<T>::~ProtectedPtr()
+ {
+ gcUnprotectNullTolerant(m_ptr);
+ }
+
+ template <class T> template <class U> inline ProtectedPtr<T>::ProtectedPtr(const ProtectedPtr<U>& o)
+ : m_ptr(o.get())
+ {
+ gcProtectNullTolerant(m_ptr);
+ }
+
+ template <class T> inline ProtectedPtr<T>& ProtectedPtr<T>::operator=(const ProtectedPtr<T>& o)
+ {
+ T* optr = o.m_ptr;
+ gcProtectNullTolerant(optr);
+ gcUnprotectNullTolerant(m_ptr);
+ m_ptr = optr;
+ return *this;
+ }
+
+ template <class T> inline ProtectedPtr<T>& ProtectedPtr<T>::operator=(T* optr)
+ {
+ gcProtectNullTolerant(optr);
+ gcUnprotectNullTolerant(m_ptr);
+ m_ptr = optr;
+ return *this;
+ }
+
+ inline ProtectedJSValue::ProtectedJSValue(JSValue value)
+ : m_value(value)
+ {
+ gcProtect(m_value);
+ }
+
+ inline ProtectedJSValue::ProtectedJSValue(const ProtectedJSValue& o)
+ : m_value(o.get())
+ {
+ gcProtect(m_value);
+ }
+
+ inline ProtectedJSValue::~ProtectedJSValue()
+ {
+ gcUnprotect(m_value);
+ }
+
+ template <class U> ProtectedJSValue::ProtectedJSValue(const ProtectedPtr<U>& o)
+ : m_value(o.get())
+ {
+ gcProtect(m_value);
+ }
+
+ inline ProtectedJSValue& ProtectedJSValue::operator=(const ProtectedJSValue& o)
+ {
+ JSValue ovalue = o.m_value;
+ gcProtect(ovalue);
+ gcUnprotect(m_value);
+ m_value = ovalue;
+ return *this;
+ }
+
+ inline ProtectedJSValue& ProtectedJSValue::operator=(JSValue ovalue)
+ {
+ gcProtect(ovalue);
+ gcUnprotect(m_value);
+ m_value = ovalue;
+ return *this;
+ }
+
+ template <class T> inline bool operator==(const ProtectedPtr<T>& a, const ProtectedPtr<T>& b) { return a.get() == b.get(); }
+ template <class T> inline bool operator==(const ProtectedPtr<T>& a, const T* b) { return a.get() == b; }
+ template <class T> inline bool operator==(const T* a, const ProtectedPtr<T>& b) { return a == b.get(); }
+
+ template <class T> inline bool operator!=(const ProtectedPtr<T>& a, const ProtectedPtr<T>& b) { return a.get() != b.get(); }
+ template <class T> inline bool operator!=(const ProtectedPtr<T>& a, const T* b) { return a.get() != b; }
+ template <class T> inline bool operator!=(const T* a, const ProtectedPtr<T>& b) { return a != b.get(); }
+
+ inline bool operator==(const ProtectedJSValue& a, const ProtectedJSValue& b) { return a.get() == b.get(); }
+ inline bool operator==(const ProtectedJSValue& a, const JSValue b) { return a.get() == b; }
+ template <class T> inline bool operator==(const ProtectedJSValue& a, const ProtectedPtr<T>& b) { return a.get() == JSValue(b.get()); }
+ inline bool operator==(const JSValue a, const ProtectedJSValue& b) { return a == b.get(); }
+ template <class T> inline bool operator==(const ProtectedPtr<T>& a, const ProtectedJSValue& b) { return JSValue(a.get()) == b.get(); }
+
+ inline bool operator!=(const ProtectedJSValue& a, const ProtectedJSValue& b) { return a.get() != b.get(); }
+ inline bool operator!=(const ProtectedJSValue& a, const JSValue b) { return a.get() != b; }
+ template <class T> inline bool operator!=(const ProtectedJSValue& a, const ProtectedPtr<T>& b) { return a.get() != JSValue(b.get()); }
+ inline bool operator!=(const JSValue a, const ProtectedJSValue& b) { return a != b.get(); }
+ template <class T> inline bool operator!=(const ProtectedPtr<T>& a, const ProtectedJSValue& b) { return JSValue(a.get()) != b.get(); }
+
+} // namespace JSC
+
+#endif // Protect_h
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