1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "class_table.h"
#include "mirror/class-inl.h"
namespace art {
ClassTable::ClassTable() {
Runtime* const runtime = Runtime::Current();
classes_.push_back(ClassSet(runtime->GetHashTableMinLoadFactor(),
runtime->GetHashTableMaxLoadFactor()));
}
void ClassTable::FreezeSnapshot() {
classes_.push_back(ClassSet());
}
bool ClassTable::Contains(mirror::Class* klass) {
for (ClassSet& class_set : classes_) {
auto it = class_set.Find(GcRoot<mirror::Class>(klass));
if (it != class_set.end()) {
return it->Read() == klass;
}
}
return false;
}
mirror::Class* ClassTable::LookupByDescriptor(mirror::Class* klass) {
for (ClassSet& class_set : classes_) {
auto it = class_set.Find(GcRoot<mirror::Class>(klass));
if (it != class_set.end()) {
return it->Read();
}
}
return nullptr;
}
mirror::Class* ClassTable::UpdateClass(const char* descriptor, mirror::Class* klass, size_t hash) {
// Should only be updating latest table.
auto existing_it = classes_.back().FindWithHash(descriptor, hash);
if (kIsDebugBuild && existing_it == classes_.back().end()) {
for (const ClassSet& class_set : classes_) {
if (class_set.FindWithHash(descriptor, hash) != class_set.end()) {
LOG(FATAL) << "Updating class found in frozen table " << descriptor;
}
}
LOG(FATAL) << "Updating class not found " << descriptor;
}
mirror::Class* const existing = existing_it->Read();
CHECK_NE(existing, klass) << descriptor;
CHECK(!existing->IsResolved()) << descriptor;
CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusResolving) << descriptor;
CHECK(!klass->IsTemp()) << descriptor;
VerifyObject(klass);
// Update the element in the hash set with the new class. This is safe to do since the descriptor
// doesn't change.
*existing_it = GcRoot<mirror::Class>(klass);
return existing;
}
size_t ClassTable::NumZygoteClasses() const {
size_t sum = 0;
for (size_t i = 0; i < classes_.size() - 1; ++i) {
sum += classes_[i].Size();
}
return sum;
}
size_t ClassTable::NumNonZygoteClasses() const {
return classes_.back().Size();
}
mirror::Class* ClassTable::Lookup(const char* descriptor, size_t hash) {
for (ClassSet& class_set : classes_) {
auto it = class_set.FindWithHash(descriptor, hash);
if (it != class_set.end()) {
return it->Read();
}
}
return nullptr;
}
void ClassTable::Insert(mirror::Class* klass) {
classes_.back().Insert(GcRoot<mirror::Class>(klass));
}
void ClassTable::InsertWithHash(mirror::Class* klass, size_t hash) {
classes_.back().InsertWithHash(GcRoot<mirror::Class>(klass), hash);
}
bool ClassTable::Remove(const char* descriptor) {
for (ClassSet& class_set : classes_) {
auto it = class_set.Find(descriptor);
if (it != class_set.end()) {
class_set.Erase(it);
return true;
}
}
return false;
}
uint32_t ClassTable::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& root)
const {
std::string temp;
return ComputeModifiedUtf8Hash(root.Read()->GetDescriptor(&temp));
}
bool ClassTable::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& a,
const GcRoot<mirror::Class>& b) const {
DCHECK_EQ(a.Read()->GetClassLoader(), b.Read()->GetClassLoader());
std::string temp;
return a.Read()->DescriptorEquals(b.Read()->GetDescriptor(&temp));
}
bool ClassTable::ClassDescriptorHashEquals::operator()(const GcRoot<mirror::Class>& a,
const char* descriptor) const {
return a.Read()->DescriptorEquals(descriptor);
}
uint32_t ClassTable::ClassDescriptorHashEquals::operator()(const char* descriptor) const {
return ComputeModifiedUtf8Hash(descriptor);
}
bool ClassTable::InsertDexFile(mirror::Object* dex_file) {
DCHECK(dex_file != nullptr);
for (GcRoot<mirror::Object>& root : dex_files_) {
if (root.Read() == dex_file) {
return false;
}
}
dex_files_.push_back(GcRoot<mirror::Object>(dex_file));
return true;
}
size_t ClassTable::WriteToMemory(uint8_t* ptr) const {
ClassSet combined;
// Combine all the class sets in case there are multiple, also adjusts load factor back to
// default in case classes were pruned.
for (const ClassSet& class_set : classes_) {
for (const GcRoot<mirror::Class>& root : class_set) {
combined.Insert(root);
}
}
const size_t ret = combined.WriteToMemory(ptr);
// Sanity check.
if (kIsDebugBuild && ptr != nullptr) {
size_t read_count;
ClassSet class_set(ptr, /*make copy*/false, &read_count);
class_set.Verify();
}
return ret;
}
size_t ClassTable::ReadFromMemory(uint8_t* ptr) {
size_t read_count = 0;
classes_.insert(classes_.begin(), ClassSet(ptr, /*make copy*/false, &read_count));
return read_count;
}
} // namespace art
|