bytecode/CallLinkInfo.h

   1 /*
   2  * Copyright (C) 2012, 2014 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/SentinelLinkedList.h>
  37
  38 namespace JSC {
  39
  40 #if ENABLE(JIT)
  41
  42 class RepatchBuffer;
  43
  44 struct CallLinkInfo : public BasicRawSentinelNode<CallLinkInfo> {
  45     enum CallType { None, Call, CallVarargs, Construct, ConstructVarargs };
  46     static CallType callTypeFor(OpcodeID opcodeID)
  47     {
  48         if (opcodeID == op_call || opcodeID == op_call_eval)
  49             return Call;
  50         if (opcodeID == op_construct)
  51             return Construct;
  52         if (opcodeID == op_construct_varargs)
  53             return ConstructVarargs;
  54         ASSERT(opcodeID == op_call_varargs);
  55         return CallVarargs;
  56     }
  57
  58     CallLinkInfo()
  59         : isFTL(false)
  60         , hasSeenShouldRepatch(false)
  61         , hasSeenClosure(false)
  62         , callType(None)
  63         , slowPathCount(0)
  64     {
  65     }
  66
  67     ~CallLinkInfo()
  68     {
  69         if (isOnList())
  70             remove();
  71     }
  72
  73     CodeSpecializationKind specializationKind() const
  74     {
  75         return specializationFromIsConstruct(callType == Construct || callType == ConstructVarargs);
  76     }
  77
  78     CodeLocationNearCall callReturnLocation;
  79     CodeLocationDataLabelPtr hotPathBegin;
  80     CodeLocationNearCall hotPathOther;
  81     JITWriteBarrier<JSFunction> callee;
  82     WriteBarrier<JSFunction> lastSeenCallee;
  83     RefPtr<ClosureCallStubRoutine> stub;
  84     bool isFTL : 1;
  85     bool hasSeenShouldRepatch : 1;
  86     bool hasSeenClosure : 1;
  87     unsigned callType : 5; // CallType
  88     unsigned calleeGPR : 8;
  89     unsigned slowPathCount;
  90     CodeOrigin codeOrigin;
  91
  92     bool isLinked() { return stub || callee; }
  93     void unlink(RepatchBuffer&);
  94
  95     bool seenOnce()
  96     {
  97         return hasSeenShouldRepatch;
  98     }
  99
 100     void setSeen()
 101     {
 102         hasSeenShouldRepatch = true;
 103     }
 104
 105     void visitWeak(RepatchBuffer&);
 106
 107     static CallLinkInfo& dummy();
 108 };
 109
 110 inline CodeOrigin getCallLinkInfoCodeOrigin(CallLinkInfo& callLinkInfo)
 111 {
 112     return callLinkInfo.codeOrigin;
 113 }
 114
 115 typedef HashMap<CodeOrigin, CallLinkInfo*, CodeOriginApproximateHash> CallLinkInfoMap;
 116
 117 #else // ENABLE(JIT)
 118
 119 typedef HashMap<int, void*> CallLinkInfoMap;
 120
 121 #endif // ENABLE(JIT)
 122
 123 } // namespace JSC
 124
 125 #endif // CallLinkInfo_h