JavaScriptCore-1097.3.tar.gz

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

diff --git a/bytecode/CallReturnOffsetToBytecodeOffset.h b/bytecode/CallReturnOffsetToBytecodeOffset.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 CallReturnOffsetToBytecodeOffset_h
+#define CallReturnOffsetToBytecodeOffset_h
+
+#include <wtf/Platform.h>
+
+namespace JSC {
+
+#if ENABLE(JIT)
+// This structure is used to map from a call return location
+// (given as an offset in bytes into the JIT code) back to
+// the bytecode index of the corresponding bytecode operation.
+// This is then used to look up the corresponding handler.
+// FIXME: This should be made inlining aware! Currently it isn't
+// because we never inline code that has exception handlers.
+struct CallReturnOffsetToBytecodeOffset {
+    CallReturnOffsetToBytecodeOffset(unsigned callReturnOffset, unsigned bytecodeOffset)
+        : callReturnOffset(callReturnOffset)
+        , bytecodeOffset(bytecodeOffset)
+    {
+    }
+
+    unsigned callReturnOffset;
+    unsigned bytecodeOffset;
+};
+
+inline unsigned getCallReturnOffset(CallReturnOffsetToBytecodeOffset* pc)
+{
+    return pc->callReturnOffset;
+}
+#endif
+
+} // namespace JSC
+
+#endif // CallReturnOffsetToBytecodeOffset_h
+