bytecode/CallLinkInfo.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 CallLinkInfo_h
  27 #define CallLinkInfo_h
  28
  29 #include "CodeLocation.h"
  30 #include "JITWriteBarrier.h"
  31 #include "JSFunction.h"
  32 #include "Opcode.h"
  33 #include "WriteBarrier.h"
  34 #include <wtf/Platform.h>
  35 #include <wtf/SentinelLinkedList.h>
  36
  37 namespace JSC {
  38
  39 #if ENABLE(JIT)
  40
  41 class RepatchBuffer;
  42
  43 struct CallLinkInfo : public BasicRawSentinelNode<CallLinkInfo> {
  44     enum CallType { None, Call, CallVarargs, Construct };
  45     static CallType callTypeFor(OpcodeID opcodeID)
  46     {
  47         if (opcodeID == op_call || opcodeID == op_call_eval)
  48             return Call;
  49         if (opcodeID == op_construct)
  50             return Construct;
  51         ASSERT(opcodeID == op_call_varargs);
  52         return CallVarargs;
  53     }
  54
  55     CallLinkInfo()
  56         : hasSeenShouldRepatch(false)
  57         , isDFG(false)
  58         , callType(None)
  59     {
  60     }
  61
  62     ~CallLinkInfo()
  63     {
  64         if (isOnList())
  65             remove();
  66     }
  67
  68     CodeLocationLabel callReturnLocation; // it's a near call in the old JIT, or a normal call in DFG
  69     CodeLocationDataLabelPtr hotPathBegin;
  70     CodeLocationNearCall hotPathOther;
  71     JITWriteBarrier<JSFunction> callee;
  72     WriteBarrier<JSFunction> lastSeenCallee;
  73     bool hasSeenShouldRepatch : 1;
  74     bool isDFG : 1;
  75     CallType callType : 6;
  76     unsigned bytecodeIndex;
  77
  78     bool isLinked() { return callee; }
  79     void unlink(JSGlobalData&, RepatchBuffer&);
  80
  81     bool seenOnce()
  82     {
  83         return hasSeenShouldRepatch;
  84     }
  85
  86     void setSeen()
  87     {
  88         hasSeenShouldRepatch = true;
  89     }
  90 };
  91
  92 inline void* getCallLinkInfoReturnLocation(CallLinkInfo* callLinkInfo)
  93 {
  94     return callLinkInfo->callReturnLocation.executableAddress();
  95 }
  96
  97 inline unsigned getCallLinkInfoBytecodeIndex(CallLinkInfo* callLinkInfo)
  98 {
  99     return callLinkInfo->bytecodeIndex;
 100 }
 101 #endif // ENABLE(JIT)
 102
 103 } // namespace JSC
 104
 105 #endif // CallLinkInfo_h