28ce41264fb1755c4c3ea8c4cb9d97bb67a36f1e
[WebKit-https.git] / Source / JavaScriptCore / bytecode / StructureStubInfo.cpp
1 /*
2  * Copyright (C) 2008 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 "PolymorphicPutByIdList.h"
31
32
33 namespace JSC {
34
35 #if ENABLE(JIT)
36 void StructureStubInfo::deref()
37 {
38     switch (accessType) {
39     case access_get_by_id_self_list: {
40         PolymorphicAccessStructureList* polymorphicStructures = u.getByIdSelfList.structureList;
41         delete polymorphicStructures;
42         return;
43     }
44     case access_put_by_id_list:
45         delete u.putByIdList.list;
46         return;
47     case access_in_list: {
48         PolymorphicAccessStructureList* polymorphicStructures = u.inList.structureList;
49         delete polymorphicStructures;
50         return;
51     }
52     case access_get_by_id_self:
53     case access_get_by_id_chain:
54     case access_put_by_id_transition_normal:
55     case access_put_by_id_transition_direct:
56     case access_put_by_id_replace:
57     case access_unset:
58         // These instructions don't have to release any allocated memory
59         return;
60     default:
61         RELEASE_ASSERT_NOT_REACHED();
62     }
63 }
64
65 bool StructureStubInfo::visitWeakReferences()
66 {
67     switch (accessType) {
68     case access_get_by_id_self:
69         if (!Heap::isMarked(u.getByIdSelf.baseObjectStructure.get()))
70             return false;
71         break;
72     case access_get_by_id_chain:
73         if (!Heap::isMarked(u.getByIdChain.baseObjectStructure.get())
74             || !Heap::isMarked(u.getByIdChain.chain.get()))
75             return false;
76         break;
77     case access_get_by_id_self_list: {
78         PolymorphicAccessStructureList* polymorphicStructures = u.getByIdSelfList.structureList;
79         if (!polymorphicStructures->visitWeak(u.getByIdSelfList.listSize))
80             return false;
81         break;
82     }
83     case access_put_by_id_transition_normal:
84     case access_put_by_id_transition_direct:
85         if (!Heap::isMarked(u.putByIdTransition.previousStructure.get())
86             || !Heap::isMarked(u.putByIdTransition.structure.get())
87             || !Heap::isMarked(u.putByIdTransition.chain.get()))
88             return false;
89         break;
90     case access_put_by_id_replace:
91         if (!Heap::isMarked(u.putByIdReplace.baseObjectStructure.get()))
92             return false;
93         break;
94     case access_put_by_id_list:
95         if (!u.putByIdList.list->visitWeak())
96             return false;
97         break;
98     case access_in_list: {
99         PolymorphicAccessStructureList* polymorphicStructures = u.inList.structureList;
100         if (!polymorphicStructures->visitWeak(u.inList.listSize))
101             return false;
102         break;
103     }
104     default:
105         // The rest of the instructions don't require references, so there is no need to
106         // do anything.
107         break;
108     }
109     return true;
110 }
111 #endif
112
113 } // namespace JSC