5ea530c8aa6bea90cda9a41cb85c4940b2250d7a
[WebKit-https.git] / Source / JavaScriptCore / bytecode / StructureStubInfo.cpp
1 /*
2  * Copyright (C) 2008, 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 #include "config.h"
27 #include "StructureStubInfo.h"
28
29 #include "JSObject.h"
30 #include "PolymorphicGetByIdList.h"
31 #include "PolymorphicPutByIdList.h"
32
33 namespace JSC {
34
35 #if ENABLE(JIT)
36 void StructureStubInfo::deref()
37 {
38     switch (accessType) {
39     case access_get_by_id_list: {
40         delete u.getByIdList.list;
41         return;
42     }
43     case access_put_by_id_list:
44         delete u.putByIdList.list;
45         return;
46     case access_in_list: {
47         PolymorphicAccessStructureList* polymorphicStructures = u.inList.structureList;
48         delete polymorphicStructures;
49         return;
50     }
51     case access_get_by_id_self:
52     case access_put_by_id_transition_normal:
53     case access_put_by_id_transition_direct:
54     case access_put_by_id_replace:
55     case access_unset:
56         // These instructions don't have to release any allocated memory
57         return;
58     default:
59         RELEASE_ASSERT_NOT_REACHED();
60     }
61 }
62
63 bool StructureStubInfo::visitWeakReferences(RepatchBuffer& repatchBuffer)
64 {
65     switch (accessType) {
66     case access_get_by_id_self:
67         if (!Heap::isMarked(u.getByIdSelf.baseObjectStructure.get()))
68             return false;
69         break;
70     case access_get_by_id_list: {
71         if (!u.getByIdList.list->visitWeak(repatchBuffer))
72             return false;
73         break;
74     }
75     case access_put_by_id_transition_normal:
76     case access_put_by_id_transition_direct:
77         if (!Heap::isMarked(u.putByIdTransition.previousStructure.get())
78             || !Heap::isMarked(u.putByIdTransition.structure.get())
79             || !Heap::isMarked(u.putByIdTransition.chain.get()))
80             return false;
81         break;
82     case access_put_by_id_replace:
83         if (!Heap::isMarked(u.putByIdReplace.baseObjectStructure.get()))
84             return false;
85         break;
86     case access_put_by_id_list:
87         if (!u.putByIdList.list->visitWeak(repatchBuffer))
88             return false;
89         break;
90     case access_in_list: {
91         PolymorphicAccessStructureList* polymorphicStructures = u.inList.structureList;
92         if (!polymorphicStructures->visitWeak(u.inList.listSize))
93             return false;
94         break;
95     }
96     default:
97         // The rest of the instructions don't require references, so there is no need to
98         // do anything.
99         break;
100     }
101     return true;
102 }
103 #endif
104
105 } // namespace JSC