bytecode/MethodCallLinkInfo.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 MethodCallLinkInfo_h
  27 #define MethodCallLinkInfo_h
  28
  29 #include "CodeLocation.h"
  30 #include "JITCode.h"
  31 #include "JITWriteBarrier.h"
  32 #include <wtf/Platform.h>
  33
  34 namespace JSC {
  35
  36 #if ENABLE(JIT)
  37
  38 class RepatchBuffer;
  39
  40 struct MethodCallLinkInfo {
  41     MethodCallLinkInfo()
  42         : seen(false)
  43     {
  44     }
  45
  46     bool seenOnce()
  47     {
  48         return seen;
  49     }
  50
  51     void setSeen()
  52     {
  53         seen = true;
  54     }
  55
  56     void reset(RepatchBuffer&, JITCode::JITType);
  57
  58     unsigned bytecodeIndex;
  59     CodeLocationCall callReturnLocation;
  60     JITWriteBarrier<Structure> cachedStructure;
  61     JITWriteBarrier<Structure> cachedPrototypeStructure;
  62     // We'd like this to actually be JSFunction, but InternalFunction and JSFunction
  63     // don't have a common parent class and we allow specialisation on both
  64     JITWriteBarrier<JSObject> cachedFunction;
  65     JITWriteBarrier<JSObject> cachedPrototype;
  66     bool seen;
  67 };
  68
  69 inline void* getMethodCallLinkInfoReturnLocation(MethodCallLinkInfo* methodCallLinkInfo)
  70 {
  71     return methodCallLinkInfo->callReturnLocation.executableAddress();
  72 }
  73
  74 inline unsigned getMethodCallLinkInfoBytecodeIndex(MethodCallLinkInfo* methodCallLinkInfo)
  75 {
  76     return methodCallLinkInfo->bytecodeIndex;
  77 }
  78
  79 #endif // ENABLE(JIT)
  80
  81 } // namespace JSC
  82
  83 #endif // MethodCallLinkInfo_h