bytecode/CallReturnOffsetToBytecodeOffset.h

   1 /*
   2  * Copyright (C) 2012 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   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
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  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 #include <wtf/Platform.h>
  30
  31 namespace JSC {
  32
  33 #if ENABLE(JIT)
  34 // This structure is used to map from a call return location
  35 // (given as an offset in bytes into the JIT code) back to
  36 // the bytecode index of the corresponding bytecode operation.
  37 // This is then used to look up the corresponding handler.
  38 // FIXME: This should be made inlining aware! Currently it isn't
  39 // because we never inline code that has exception handlers.
  40 struct CallReturnOffsetToBytecodeOffset {
  41     CallReturnOffsetToBytecodeOffset(unsigned callReturnOffset, unsigned bytecodeOffset)
  42         : callReturnOffset(callReturnOffset)
  43         , bytecodeOffset(bytecodeOffset)
  44     {
  45     }
  46
  47     unsigned callReturnOffset;
  48     unsigned bytecodeOffset;
  49 };
  50
  51 inline unsigned getCallReturnOffset(CallReturnOffsetToBytecodeOffset* pc)
  52 {
  53     return pc->callReturnOffset;
  54 }
  55 #endif
  56
  57 } // namespace JSC
  58
  59 #endif // CallReturnOffsetToBytecodeOffset_h
  60