JavaScriptCore-1097.3.tar.gz

[apple/javascriptcore.git] / interpreter / AbstractPC.h

diff --git a/interpreter/AbstractPC.h b/interpreter/AbstractPC.h
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+/*
+ * Copyright (C) 2012 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 AbstractPC_h
+#define AbstractPC_h
+
+#include "MacroAssemblerCodeRef.h"
+#include <wtf/Platform.h>
+
+namespace JSC {
+
+class JSGlobalData;
+class ExecState;
+struct Instruction;
+
+class AbstractPC {
+public:
+    AbstractPC()
+        : m_pointer(0)
+        , m_mode(None)
+    {
+    }
+    
+    AbstractPC(JSGlobalData&, ExecState*);
+    
+#if ENABLE(JIT)
+    AbstractPC(ReturnAddressPtr ptr)
+        : m_pointer(ptr.value())
+        , m_mode(JIT)
+    {
+    }
+    
+    bool hasJITReturnAddress() const { return m_mode == JIT; }
+    ReturnAddressPtr jitReturnAddress() const
+    {
+        ASSERT(hasJITReturnAddress());
+        return ReturnAddressPtr(m_pointer);
+    }
+#endif
+
+#if ENABLE(CLASSIC_INTERPRETER)
+    AbstractPC(Instruction* vPC)
+        : m_pointer(vPC)
+        , m_mode(Interpreter)
+    {
+    }
+    
+    bool hasInterpreterReturnAddress() const { return m_mode == Interpreter; }
+    Instruction* interpreterReturnAddress() const
+    {
+        ASSERT(hasInterpreterReturnAddress());
+        return static_cast<Instruction*>(m_pointer);
+    }
+#endif
+    
+    bool isSet() const { return m_mode != None; }
+    bool operator!() const { return !isSet(); }
+
+private:
+    void* m_pointer;
+    
+    enum Mode { None, JIT, Interpreter };
+    Mode m_mode;
+};
+
+} // namespace JSC
+
+#endif // AbstractPC_h
+