JavaScriptCore-1097.3.tar.gz

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

diff --git a/bytecode/CallLinkStatus.h b/bytecode/CallLinkStatus.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 CallLinkStatus_h
+#define CallLinkStatus_h
+
+namespace JSC {
+
+class JSFunction;
+class CodeBlock;
+
+class CallLinkStatus {
+public:
+    CallLinkStatus()
+        : m_callTarget(0)
+        , m_couldTakeSlowPath(false)
+    {
+    }
+    
+    CallLinkStatus(JSFunction* callTarget, bool couldTakeSlowPath)
+        : m_callTarget(callTarget)
+        , m_couldTakeSlowPath(couldTakeSlowPath)
+    {
+    }
+    
+    static CallLinkStatus computeFor(CodeBlock*, unsigned bytecodeIndex);
+    
+    bool isSet() const { return !!m_callTarget || m_couldTakeSlowPath; }
+    
+    bool operator!() const { return !isSet(); }
+    
+    bool couldTakeSlowPath() const { return m_couldTakeSlowPath; }
+    
+    JSFunction* callTarget() const { return m_callTarget; }
+    
+private:
+    static CallLinkStatus computeFromLLInt(CodeBlock*, unsigned bytecodeIndex);
+    
+    JSFunction* m_callTarget;
+    bool m_couldTakeSlowPath;
+};
+
+} // namespace JSC
+
+#endif // CallLinkStatus_h
+