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 "ClosureCallStubRoutine.h"
  30 #include "CodeLocation.h"
  31 #include "CodeSpecializationKind.h"
  32 #include "JITWriteBarrier.h"
  33 #include "JSFunction.h"
  34 #include "Opcode.h"
  35 #include "WriteBarrier.h"
  36 #include <wtf/Platform.h>
  37 #include <wtf/SentinelLinkedList.h>
  38
  39 namespace JSC {
  40
  41 #if ENABLE(JIT)
  42
  43 class RepatchBuffer;
  44
  45 struct CallLinkInfo : public BasicRawSentinelNode<CallLinkInfo> {
  46     enum CallType { None, Call, CallVarargs, Construct };
  47     static CallType callTypeFor(OpcodeID opcodeID)
  48     {
  49         if (opcodeID == op_call || opcodeID == op_call_eval)
  50             return Call;
  51         if (opcodeID == op_construct)
  52             return Construct;
  53         ASSERT(opcodeID == op_call_varargs);
  54         return CallVarargs;
  55     }
  56
  57     CallLinkInfo()
  58         : hasSeenShouldRepatch(false)
  59         , isDFG(false)
  60         , hasSeenClosure(false)
  61         , callType(None)
  62     {
  63     }
  64
  65     ~CallLinkInfo()
  66     {
  67         if (isOnList())
  68             remove();
  69     }
  70
  71     CodeSpecializationKind specializationKind() const
  72     {
  73         return specializationFromIsConstruct(callType == Construct);
  74     }
  75
  76     CodeLocationNearCall callReturnLocation;
  77     CodeLocationDataLabelPtr hotPathBegin;
  78     CodeLocationNearCall hotPathOther;
  79     JITWriteBarrier<JSFunction> callee;
  80     WriteBarrier<JSFunction> lastSeenCallee;
  81     RefPtr<ClosureCallStubRoutine> stub;
  82     bool hasSeenShouldRepatch : 1;
  83     bool isDFG : 1;
  84     bool hasSeenClosure : 1;
  85     CallType callType : 5;
  86     unsigned calleeGPR : 8;
  87     CodeOrigin codeOrigin;
  88
  89     bool isLinked() { return stub || callee; }
  90     void unlink(VM&, RepatchBuffer&);
  91
  92     bool seenOnce()
  93     {
  94         return hasSeenShouldRepatch;
  95     }
  96
  97     void setSeen()
  98     {
  99         hasSeenShouldRepatch = true;
 100     }
 101 };
 102
 103 inline void* getCallLinkInfoReturnLocation(CallLinkInfo* callLinkInfo)
 104 {
 105     return callLinkInfo->callReturnLocation.executableAddress();
 106 }
 107
 108 inline unsigned getCallLinkInfoBytecodeIndex(CallLinkInfo* callLinkInfo)
 109 {
 110     return callLinkInfo->codeOrigin.bytecodeIndex;
 111 }
 112 #endif // ENABLE(JIT)
 113
 114 } // namespace JSC
 115
 116 #endif // CallLinkInfo_h