JavaScriptCore-7600.1.4.9.tar.gz

[apple/javascriptcore.git] / bytecode / PutByIdVariant.h

diff --git a/bytecode/PutByIdVariant.h b/bytecode/PutByIdVariant.h
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+/*
+ * Copyright (C) 2014 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. ``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
+ * 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 PutByIdVariant_h
+#define PutByIdVariant_h
+
+#include "IntendedStructureChain.h"
+#include "PropertyOffset.h"
+
+namespace JSC {
+
+class PutByIdVariant {
+public:
+    enum Kind {
+        NotSet,
+        Replace,
+        Transition
+    };
+    
+    PutByIdVariant()
+        : m_kind(NotSet)
+        , m_oldStructure(0)
+        , m_newStructure(0)
+        , m_offset(invalidOffset)
+    {
+    }
+    
+    static PutByIdVariant replace(Structure* structure, PropertyOffset offset)
+    {
+        PutByIdVariant result;
+        result.m_kind = Replace;
+        result.m_oldStructure = structure;
+        result.m_offset = offset;
+        return result;
+    }
+    
+    static PutByIdVariant transition(
+        Structure* oldStructure, Structure* newStructure,
+        PassRefPtr<IntendedStructureChain> structureChain, PropertyOffset offset)
+    {
+        PutByIdVariant result;
+        result.m_kind = Transition;
+        result.m_oldStructure = oldStructure;
+        result.m_newStructure = newStructure;
+        result.m_structureChain = structureChain;
+        result.m_offset = offset;
+        return result;
+    }
+    
+    Kind kind() const { return m_kind; }
+    
+    bool isSet() const { return kind() != NotSet; }
+    bool operator!() const { return !isSet(); }
+    
+    Structure* structure() const
+    {
+        ASSERT(kind() == Replace);
+        return m_oldStructure;
+    }
+    
+    Structure* oldStructure() const
+    {
+        ASSERT(kind() == Transition || kind() == Replace);
+        return m_oldStructure;
+    }
+    
+    Structure* newStructure() const
+    {
+        ASSERT(kind() == Transition);
+        return m_newStructure;
+    }
+    
+    IntendedStructureChain* structureChain() const
+    {
+        ASSERT(kind() == Transition);
+        return m_structureChain.get();
+    }
+    
+    PropertyOffset offset() const
+    {
+        ASSERT(isSet());
+        return m_offset;
+    }
+    
+    void dump(PrintStream&) const;
+    void dumpInContext(PrintStream&, DumpContext*) const;
+
+private:
+    Kind m_kind;
+    Structure* m_oldStructure;
+    Structure* m_newStructure;
+    RefPtr<IntendedStructureChain> m_structureChain;
+    PropertyOffset m_offset;
+};
+
+} // namespace JSC
+
+#endif // PutByIdVariant_h
+