1 /*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #ifndef ART_RUNTIME_MIRROR_CLASS_REFVISITOR_INL_H_
18 #define ART_RUNTIME_MIRROR_CLASS_REFVISITOR_INL_H_
19
20 #include "class-inl.h"
21
22 #include "art_field-inl.h"
23 #include "class_ext-inl.h"
24
25 namespace art {
26 namespace mirror {
27
28 template <bool kVisitNativeRoots,
29 VerifyObjectFlags kVerifyFlags,
30 ReadBarrierOption kReadBarrierOption,
31 typename Visitor>
VisitReferences(ObjPtr<Class> klass,const Visitor & visitor)32 inline void Class::VisitReferences(ObjPtr<Class> klass, const Visitor& visitor) {
33 VisitInstanceFieldsReferences<kVerifyFlags, kReadBarrierOption>(klass.Ptr(), visitor);
34 // Right after a class is allocated, but not yet loaded
35 // (ClassStatus::kNotReady, see ClassLinker::LoadClass()), GC may find it
36 // and scan it. IsTemp() may call Class::GetAccessFlags() but may
37 // fail in the DCHECK in Class::GetAccessFlags() because the class
38 // status is ClassStatus::kNotReady. To avoid it, rely on IsResolved()
39 // only. This is fine because a temp class never goes into the
40 // ClassStatus::kResolved state.
41 if (IsResolved<kVerifyFlags>()) {
42 // Temp classes don't ever populate imt/vtable or static fields and they are not even
43 // allocated with the right size for those. Also, unresolved classes don't have fields
44 // linked yet.
45 VisitStaticFieldsReferences<kVerifyFlags, kReadBarrierOption>(this, visitor);
46 }
47 if (kVisitNativeRoots) {
48 // Since this class is reachable, we must also visit the associated roots when we scan it.
49 VisitNativeRoots<kReadBarrierOption>(
50 visitor, Runtime::Current()->GetClassLinker()->GetImagePointerSize());
51 }
52 }
53
54 template<ReadBarrierOption kReadBarrierOption, class Visitor>
VisitNativeRoots(Visitor & visitor,PointerSize pointer_size)55 void Class::VisitNativeRoots(Visitor& visitor, PointerSize pointer_size) {
56 VisitFields<kReadBarrierOption>([&](ArtField* field) REQUIRES_SHARED(art::Locks::mutator_lock_) {
57 field->VisitRoots(visitor);
58 if (kIsDebugBuild && IsResolved()) {
59 CHECK_EQ(field->GetDeclaringClass<kReadBarrierOption>(), this)
60 << GetStatus() << field->GetDeclaringClass()->PrettyClass() << " != " << PrettyClass();
61 }
62 });
63 // Don't use VisitMethods because we don't want to hit the class-ext methods twice.
64 for (ArtMethod& method : GetMethods(pointer_size)) {
65 method.VisitRoots<kReadBarrierOption>(visitor, pointer_size);
66 }
67 ObjPtr<ClassExt> ext(GetExtData<kDefaultVerifyFlags, kReadBarrierOption>());
68 if (!ext.IsNull()) {
69 ext->VisitNativeRoots<kReadBarrierOption, Visitor>(visitor, pointer_size);
70 }
71 }
72
73 template<ReadBarrierOption kReadBarrierOption, class Visitor>
VisitMethods(Visitor visitor,PointerSize pointer_size)74 void Class::VisitMethods(Visitor visitor, PointerSize pointer_size) {
75 for (ArtMethod& method : GetMethods(pointer_size)) {
76 visitor(&method);
77 }
78 ObjPtr<ClassExt> ext(GetExtData<kDefaultVerifyFlags, kReadBarrierOption>());
79 if (!ext.IsNull()) {
80 ext->VisitMethods<kReadBarrierOption, Visitor>(visitor, pointer_size);
81 }
82 }
83
84 template<ReadBarrierOption kReadBarrierOption, class Visitor>
VisitFields(Visitor visitor)85 void Class::VisitFields(Visitor visitor) {
86 for (ArtField& sfield : GetSFieldsUnchecked()) {
87 visitor(&sfield);
88 }
89 for (ArtField& ifield : GetIFieldsUnchecked()) {
90 visitor(&ifield);
91 }
92 }
93
94 } // namespace mirror
95 } // namespace art
96
97 #endif // ART_RUNTIME_MIRROR_CLASS_REFVISITOR_INL_H_
98