DFG should have adaptive structure watchpoints
[WebKit-https.git] / Source / JavaScriptCore / bytecode / StructureStubInfo.cpp
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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_put_by_id_transition_normal:
52     case access_put_by_id_transition_direct:
53         ObjectPropertyConditionSet::adoptRawPointer(u.putByIdTransition.rawConditionSet);
54         u.putByIdTransition.rawConditionSet = nullptr;
55         return;
56     case access_get_by_id_self:
57     case access_put_by_id_replace:
58     case access_unset:
59         // These instructions don't have to release any allocated memory
60         return;
61     default:
62         RELEASE_ASSERT_NOT_REACHED();
63     }
64 }
65
66 bool StructureStubInfo::visitWeakReferences(RepatchBuffer& repatchBuffer)
67 {
68     switch (accessType) {
69     case access_get_by_id_self:
70         if (!Heap::isMarked(u.getByIdSelf.baseObjectStructure.get()))
71             return false;
72         break;
73     case access_get_by_id_list: {
74         if (!u.getByIdList.list->visitWeak(repatchBuffer))
75             return false;
76         break;
77     }
78     case access_put_by_id_transition_normal:
79     case access_put_by_id_transition_direct:
80         if (!Heap::isMarked(u.putByIdTransition.previousStructure.get())
81             || !Heap::isMarked(u.putByIdTransition.structure.get()))
82             return false;
83         if (!ObjectPropertyConditionSet::fromRawPointer(u.putByIdTransition.rawConditionSet).areStillLive())
84             return false;
85         break;
86     case access_put_by_id_replace:
87         if (!Heap::isMarked(u.putByIdReplace.baseObjectStructure.get()))
88             return false;
89         break;
90     case access_put_by_id_list:
91         if (!u.putByIdList.list->visitWeak(repatchBuffer))
92             return false;
93         break;
94     case access_in_list: {
95         PolymorphicAccessStructureList* polymorphicStructures = u.inList.structureList;
96         if (!polymorphicStructures->visitWeak(u.inList.listSize))
97             return false;
98         break;
99     }
100     default:
101         // The rest of the instructions don't require references, so there is no need to
102         // do anything.
103         break;
104     }
105     return true;
106 }
107 #endif
108
109 } // namespace JSC