1 /*
2 * Copyright (C) 2016 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 #include "class_ext-inl.h"
18
19 #include "art_method-inl.h"
20 #include "base/casts.h"
21 #include "base/enums.h"
22 #include "base/utils.h"
23 #include "class-inl.h"
24 #include "dex/dex_file-inl.h"
25 #include "gc/accounting/card_table-inl.h"
26 #include "object-inl.h"
27 #include "object_array.h"
28 #include "stack_trace_element.h"
29 #include "well_known_classes.h"
30
31 namespace art {
32 namespace mirror {
33
34 GcRoot<Class> ClassExt::dalvik_system_ClassExt_;
35
ClassSize(PointerSize pointer_size)36 uint32_t ClassExt::ClassSize(PointerSize pointer_size) {
37 uint32_t vtable_entries = Object::kVTableLength;
38 return Class::ComputeClassSize(true, vtable_entries, 0, 0, 0, 0, 0, pointer_size);
39 }
40
SetObsoleteArrays(ObjPtr<PointerArray> methods,ObjPtr<ObjectArray<DexCache>> dex_caches)41 void ClassExt::SetObsoleteArrays(ObjPtr<PointerArray> methods,
42 ObjPtr<ObjectArray<DexCache>> dex_caches) {
43 CHECK_EQ(methods.IsNull(), dex_caches.IsNull());
44 auto obsolete_dex_cache_off = OFFSET_OF_OBJECT_MEMBER(ClassExt, obsolete_dex_caches_);
45 auto obsolete_methods_off = OFFSET_OF_OBJECT_MEMBER(ClassExt, obsolete_methods_);
46 DCHECK(!Runtime::Current()->IsActiveTransaction());
47 SetFieldObject<false>(obsolete_dex_cache_off, dex_caches.Ptr());
48 SetFieldObject<false>(obsolete_methods_off, methods.Ptr());
49 }
50
51 // We really need to be careful how we update this. If we ever in the future make it so that
52 // these arrays are written into without all threads being suspended we have a race condition! This
53 // race could cause obsolete methods to be missed.
ExtendObsoleteArrays(Thread * self,uint32_t increase)54 bool ClassExt::ExtendObsoleteArrays(Thread* self, uint32_t increase) {
55 // TODO It would be good to check that we have locked the class associated with this ClassExt.
56 StackHandleScope<5> hs(self);
57 Handle<ClassExt> h_this(hs.NewHandle(this));
58 Handle<PointerArray> old_methods(hs.NewHandle(h_this->GetObsoleteMethods()));
59 Handle<ObjectArray<DexCache>> old_dex_caches(hs.NewHandle(h_this->GetObsoleteDexCaches()));
60 ClassLinker* cl = Runtime::Current()->GetClassLinker();
61 size_t new_len;
62 if (old_methods == nullptr) {
63 CHECK(old_dex_caches == nullptr);
64 new_len = increase;
65 } else {
66 CHECK_EQ(old_methods->GetLength(), old_dex_caches->GetLength());
67 new_len = increase + old_methods->GetLength();
68 }
69 Handle<PointerArray> new_methods(hs.NewHandle<PointerArray>(
70 cl->AllocPointerArray(self, new_len)));
71 if (new_methods.IsNull()) {
72 // Fail.
73 self->AssertPendingOOMException();
74 return false;
75 }
76 Handle<ObjectArray<DexCache>> new_dex_caches(hs.NewHandle<ObjectArray<DexCache>>(
77 ObjectArray<DexCache>::Alloc(self,
78 cl->FindClass(self,
79 "[Ljava/lang/DexCache;",
80 ScopedNullHandle<ClassLoader>()),
81 new_len)));
82 if (new_dex_caches.IsNull()) {
83 // Fail.
84 self->AssertPendingOOMException();
85 return false;
86 }
87
88 if (!old_methods.IsNull()) {
89 // Copy the old contents.
90 new_methods->Memcpy(0,
91 old_methods.Get(),
92 0,
93 old_methods->GetLength(),
94 cl->GetImagePointerSize());
95 new_dex_caches->AsObjectArray<Object>()->AssignableCheckingMemcpy<false>(
96 0, old_dex_caches->AsObjectArray<Object>(), 0, old_dex_caches->GetLength(), false);
97 }
98 // Set the fields.
99 h_this->SetObsoleteArrays(new_methods.Get(), new_dex_caches.Get());
100
101 return true;
102 }
103
Alloc(Thread * self)104 ClassExt* ClassExt::Alloc(Thread* self) {
105 DCHECK(dalvik_system_ClassExt_.Read() != nullptr);
106 return down_cast<ClassExt*>(dalvik_system_ClassExt_.Read()->AllocObject(self).Ptr());
107 }
108
SetVerifyError(ObjPtr<Object> err)109 void ClassExt::SetVerifyError(ObjPtr<Object> err) {
110 if (Runtime::Current()->IsActiveTransaction()) {
111 SetFieldObject<true>(OFFSET_OF_OBJECT_MEMBER(ClassExt, verify_error_), err);
112 } else {
113 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(ClassExt, verify_error_), err);
114 }
115 }
116
SetOriginalDexFile(ObjPtr<Object> bytes)117 void ClassExt::SetOriginalDexFile(ObjPtr<Object> bytes) {
118 DCHECK(!Runtime::Current()->IsActiveTransaction());
119 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(ClassExt, original_dex_file_), bytes);
120 }
121
SetClass(ObjPtr<Class> dalvik_system_ClassExt)122 void ClassExt::SetClass(ObjPtr<Class> dalvik_system_ClassExt) {
123 CHECK(dalvik_system_ClassExt != nullptr);
124 dalvik_system_ClassExt_ = GcRoot<Class>(dalvik_system_ClassExt);
125 }
126
ResetClass()127 void ClassExt::ResetClass() {
128 CHECK(!dalvik_system_ClassExt_.IsNull());
129 dalvik_system_ClassExt_ = GcRoot<Class>(nullptr);
130 }
131
VisitRoots(RootVisitor * visitor)132 void ClassExt::VisitRoots(RootVisitor* visitor) {
133 dalvik_system_ClassExt_.VisitRootIfNonNull(visitor, RootInfo(kRootStickyClass));
134 }
135
136 } // namespace mirror
137 } // namespace art
138