1 /*
2 * Copyright (C) 2015 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_CLASS_TABLE_INL_H_
18 #define ART_RUNTIME_CLASS_TABLE_INL_H_
19
20 #include "class_table.h"
21 #include "oat_file.h"
22
23 namespace art {
24
25 template<class Visitor>
VisitRoots(Visitor & visitor)26 void ClassTable::VisitRoots(Visitor& visitor) {
27 ReaderMutexLock mu(Thread::Current(), lock_);
28 for (ClassSet& class_set : classes_) {
29 for (TableSlot& table_slot : class_set) {
30 table_slot.VisitRoot(visitor);
31 }
32 }
33 for (GcRoot<mirror::Object>& root : strong_roots_) {
34 visitor.VisitRoot(root.AddressWithoutBarrier());
35 }
36 for (const OatFile* oat_file : oat_files_) {
37 for (GcRoot<mirror::Object>& root : oat_file->GetBssGcRoots()) {
38 visitor.VisitRootIfNonNull(root.AddressWithoutBarrier());
39 }
40 }
41 }
42
43 template<class Visitor>
VisitRoots(const Visitor & visitor)44 void ClassTable::VisitRoots(const Visitor& visitor) {
45 ReaderMutexLock mu(Thread::Current(), lock_);
46 for (ClassSet& class_set : classes_) {
47 for (TableSlot& table_slot : class_set) {
48 table_slot.VisitRoot(visitor);
49 }
50 }
51 for (GcRoot<mirror::Object>& root : strong_roots_) {
52 visitor.VisitRoot(root.AddressWithoutBarrier());
53 }
54 for (const OatFile* oat_file : oat_files_) {
55 for (GcRoot<mirror::Object>& root : oat_file->GetBssGcRoots()) {
56 visitor.VisitRootIfNonNull(root.AddressWithoutBarrier());
57 }
58 }
59 }
60
61 template <typename Visitor>
Visit(Visitor & visitor)62 bool ClassTable::Visit(Visitor& visitor) {
63 ReaderMutexLock mu(Thread::Current(), lock_);
64 for (ClassSet& class_set : classes_) {
65 for (TableSlot& table_slot : class_set) {
66 if (!visitor(table_slot.Read())) {
67 return false;
68 }
69 }
70 }
71 return true;
72 }
73
74 template <typename Visitor>
Visit(const Visitor & visitor)75 bool ClassTable::Visit(const Visitor& visitor) {
76 ReaderMutexLock mu(Thread::Current(), lock_);
77 for (ClassSet& class_set : classes_) {
78 for (TableSlot& table_slot : class_set) {
79 if (!visitor(table_slot.Read())) {
80 return false;
81 }
82 }
83 }
84 return true;
85 }
86
87 template<ReadBarrierOption kReadBarrierOption>
Read()88 inline mirror::Class* ClassTable::TableSlot::Read() const {
89 const uint32_t before = data_.LoadRelaxed();
90 ObjPtr<mirror::Class> const before_ptr(ExtractPtr(before));
91 ObjPtr<mirror::Class> const after_ptr(
92 GcRoot<mirror::Class>(before_ptr).Read<kReadBarrierOption>());
93 if (kReadBarrierOption != kWithoutReadBarrier && before_ptr != after_ptr) {
94 // If another thread raced and updated the reference, do not store the read barrier updated
95 // one.
96 data_.CompareExchangeStrongRelease(before, Encode(after_ptr, MaskHash(before)));
97 }
98 return after_ptr.Ptr();
99 }
100
101 template<typename Visitor>
VisitRoot(const Visitor & visitor)102 inline void ClassTable::TableSlot::VisitRoot(const Visitor& visitor) const {
103 const uint32_t before = data_.LoadRelaxed();
104 ObjPtr<mirror::Class> before_ptr(ExtractPtr(before));
105 GcRoot<mirror::Class> root(before_ptr);
106 visitor.VisitRoot(root.AddressWithoutBarrier());
107 ObjPtr<mirror::Class> after_ptr(root.Read<kWithoutReadBarrier>());
108 if (before_ptr != after_ptr) {
109 // If another thread raced and updated the reference, do not store the read barrier updated
110 // one.
111 data_.CompareExchangeStrongRelease(before, Encode(after_ptr, MaskHash(before)));
112 }
113 }
114
ExtractPtr(uint32_t data)115 inline ObjPtr<mirror::Class> ClassTable::TableSlot::ExtractPtr(uint32_t data) {
116 return reinterpret_cast<mirror::Class*>(data & ~kHashMask);
117 }
118
Encode(ObjPtr<mirror::Class> klass,uint32_t hash_bits)119 inline uint32_t ClassTable::TableSlot::Encode(ObjPtr<mirror::Class> klass, uint32_t hash_bits) {
120 DCHECK_LE(hash_bits, kHashMask);
121 return reinterpret_cast<uintptr_t>(klass.Ptr()) | hash_bits;
122 }
123
TableSlot(ObjPtr<mirror::Class> klass,uint32_t descriptor_hash)124 inline ClassTable::TableSlot::TableSlot(ObjPtr<mirror::Class> klass, uint32_t descriptor_hash)
125 : data_(Encode(klass, MaskHash(descriptor_hash))) {
126 if (kIsDebugBuild) {
127 std::string temp;
128 const uint32_t hash = ComputeModifiedUtf8Hash(klass->GetDescriptor(&temp));
129 CHECK_EQ(descriptor_hash, hash);
130 }
131 }
132
133 } // namespace art
134
135 #endif // ART_RUNTIME_CLASS_TABLE_INL_H_
136