bytecode/CallReturnOffsetToBytecodeOffset.h

   1 /*
   2  * Copyright (C) 2012 Apple Inc. All rights reserved.
   3  *
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   5  * modification, are permitted provided that the following conditions
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   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
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  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef CallReturnOffsetToBytecodeOffset_h
  27 #define CallReturnOffsetToBytecodeOffset_h
  28
  29 namespace JSC {
  30
  31 #if ENABLE(JIT)
  32 // This structure is used to map from a call return location
  33 // (given as an offset in bytes into the JIT code) back to
  34 // the bytecode index of the corresponding bytecode operation.
  35 // This is then used to look up the corresponding handler.
  36 // FIXME: This should be made inlining aware! Currently it isn't
  37 // because we never inline code that has exception handlers.
  38 struct CallReturnOffsetToBytecodeOffset {
  39     CallReturnOffsetToBytecodeOffset(unsigned callReturnOffset, unsigned bytecodeOffset)
  40         : callReturnOffset(callReturnOffset)
  41         , bytecodeOffset(bytecodeOffset)
  42     {
  43     }
  44
  45     unsigned callReturnOffset;
  46     unsigned bytecodeOffset;
  47 };
  48
  49 inline unsigned getCallReturnOffset(CallReturnOffsetToBytecodeOffset* pc)
  50 {
  51     return pc->callReturnOffset;
  52 }
  53 #endif
  54
  55 } // namespace JSC
  56
  57 #endif // CallReturnOffsetToBytecodeOffset_h
  58