Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 215 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/runtime/Protect.h b/Source/JavaScriptCore/runtime/Protect.h
new file mode 100644
index 0000000..06cf97f
--- /dev/null
+++ b/Source/JavaScriptCore/runtime/Protect.h
@@ -0,0 +1,215 @@
+/*
+ *  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