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
38namespace JSC {
39
40#if ENABLE(JIT)
41
42class RepatchBuffer;
43
44struct 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
110inline CodeOrigin getCallLinkInfoCodeOrigin(CallLinkInfo& callLinkInfo)
111{
112    return callLinkInfo.codeOrigin;
113}
114
115typedef HashMap<CodeOrigin, CallLinkInfo*, CodeOriginApproximateHash> CallLinkInfoMap;
116
117#else // ENABLE(JIT)
118
119typedef HashMap<int, void*> CallLinkInfoMap;
120
121#endif // ENABLE(JIT)
122
123} // namespace JSC
124
125#endif // CallLinkInfo_h
126