webkitgtk-2.10.2webkitgtk-2.10.2

1 files changed, 136 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/bytecompiler/LabelScope.h b/Source/JavaScriptCore/bytecompiler/LabelScope.h
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+++ b/Source/JavaScriptCore/bytecompiler/LabelScope.h
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+/*
+ * Copyright (C) 2008 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.
+ * 3.  Neither the name of Apple Inc. ("Apple") 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 APPLE 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 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 LabelScope_h
+#define LabelScope_h
+
+#include <wtf/PassRefPtr.h>
+#include "Label.h"
+
+namespace JSC {
+
+    class Identifier;
+
+    class LabelScope {
+    public:
+        enum Type { Loop, Switch, NamedLabel };
+
+        LabelScope(Type type, const Identifier* name, int scopeDepth, PassRefPtr<Label> breakTarget, PassRefPtr<Label> continueTarget)
+            : m_refCount(0)
+            , m_type(type)
+            , m_name(name)
+            , m_scopeDepth(scopeDepth)
+            , m_breakTarget(breakTarget)
+            , m_continueTarget(continueTarget)
+        {
+        }
+        int refCount() const { return m_refCount; }
+
+        Label* breakTarget() const { return m_breakTarget.get(); }
+        Label* continueTarget() const { return m_continueTarget.get(); }
+
+        Type type() const { return m_type; }
+        const Identifier* name() const { return m_name; }
+        int scopeDepth() const { return m_scopeDepth; }
+
+    private:
+        friend class LabelScopePtr;
+
+        void ref() { ++m_refCount; }
+        void deref()
+        {
+            --m_refCount;
+            ASSERT(m_refCount >= 0);
+        }
+
+        int m_refCount;
+        Type m_type;
+        const Identifier* m_name;
+        int m_scopeDepth;
+        RefPtr<Label> m_breakTarget;
+        RefPtr<Label> m_continueTarget;
+    };
+
+    typedef Vector<LabelScope, 8> LabelScopeStore;
+
+    class LabelScopePtr {
+    public:
+        LabelScopePtr()
+            : m_owner(0)
+            , m_index(0)
+        {
+        }
+        LabelScopePtr(LabelScopeStore& owner, size_t index)
+            : m_owner(&owner)
+            , m_index(index)
+        {
+            m_owner->at(index).ref();
+        }
+
+        LabelScopePtr(const LabelScopePtr& other)
+            : m_owner(other.m_owner)
+            , m_index(other.m_index)
+        {
+            if (m_owner)
+                m_owner->at(m_index).ref();
+        }
+
+        const LabelScopePtr& operator=(const LabelScopePtr& other)
+        {
+            if (other.m_owner)
+                other.m_owner->at(other.m_index).ref();
+            if (m_owner)
+                m_owner->at(m_index).deref();
+            m_owner = other.m_owner;
+            m_index = other.m_index;
+            return *this;
+        }
+
+        ~LabelScopePtr()
+        {
+            if (m_owner)
+                m_owner->at(m_index).deref();
+        }
+
+        bool operator!() const { return !m_owner; }
+
+        LabelScope& operator*() { ASSERT(m_owner); return m_owner->at(m_index); }
+        LabelScope* operator->() { ASSERT(m_owner); return &m_owner->at(m_index); }
+        const LabelScope& operator*() const { ASSERT(m_owner); return m_owner->at(m_index); }
+        const LabelScope* operator->() const { ASSERT(m_owner); return &m_owner->at(m_index); }
+
+        static LabelScopePtr null() { return LabelScopePtr(); }
+
+    private:
+        LabelScopeStore* m_owner;
+        size_t m_index;
+    };
+
+} // namespace JSC
+
+#endif // LabelScope_h