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
39namespace JSC {
40
41#if ENABLE(JIT)
42
43class RepatchBuffer;
44
45struct 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
103inline void* getCallLinkInfoReturnLocation(CallLinkInfo* callLinkInfo)
104{
105    return callLinkInfo->callReturnLocation.executableAddress();
106}
107
108inline unsigned getCallLinkInfoBytecodeIndex(CallLinkInfo* callLinkInfo)
109{
110    return callLinkInfo->codeOrigin.bytecodeIndex;
111}
112#endif // ENABLE(JIT)
113
114} // namespace JSC
115
116#endif // CallLinkInfo_h
117