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-alloc-inl.h"
24 #include "class-inl.h"
25 #include "class_root.h"
26 #include "dex/dex_file-inl.h"
27 #include "gc/accounting/card_table-inl.h"
28 #include "object-inl.h"
29 #include "object_array-alloc-inl.h"
30 #include "object_array-inl.h"
31 #include "stack_trace_element.h"
32 #include "well_known_classes.h"
33
34 namespace art {
35 namespace mirror {
36
ClassSize(PointerSize pointer_size)37 uint32_t ClassExt::ClassSize(PointerSize pointer_size) {
38 uint32_t vtable_entries = Object::kVTableLength;
39 return Class::ComputeClassSize(true, vtable_entries, 0, 0, 0, 0, 0, pointer_size);
40 }
41
SetObsoleteArrays(ObjPtr<PointerArray> methods,ObjPtr<ObjectArray<DexCache>> dex_caches)42 void ClassExt::SetObsoleteArrays(ObjPtr<PointerArray> methods,
43 ObjPtr<ObjectArray<DexCache>> dex_caches) {
44 CHECK_EQ(methods.IsNull(), dex_caches.IsNull());
45 auto obsolete_dex_cache_off = OFFSET_OF_OBJECT_MEMBER(ClassExt, obsolete_dex_caches_);
46 auto obsolete_methods_off = OFFSET_OF_OBJECT_MEMBER(ClassExt, obsolete_methods_);
47 DCHECK(!Runtime::Current()->IsActiveTransaction());
48 SetFieldObject<false>(obsolete_dex_cache_off, dex_caches);
49 SetFieldObject<false>(obsolete_methods_off, methods);
50 }
51
52 // We really need to be careful how we update this. If we ever in the future make it so that
53 // these arrays are written into without all threads being suspended we have a race condition! This
54 // race could cause obsolete methods to be missed.
ExtendObsoleteArrays(Thread * self,uint32_t increase)55 bool ClassExt::ExtendObsoleteArrays(Thread* self, uint32_t increase) {
56 // TODO It would be good to check that we have locked the class associated with this ClassExt.
57 StackHandleScope<5> hs(self);
58 Handle<ClassExt> h_this(hs.NewHandle(this));
59 Handle<PointerArray> old_methods(hs.NewHandle(h_this->GetObsoleteMethods()));
60 Handle<ObjectArray<DexCache>> old_dex_caches(hs.NewHandle(h_this->GetObsoleteDexCaches()));
61 ClassLinker* cl = Runtime::Current()->GetClassLinker();
62 size_t new_len;
63 if (old_methods == nullptr) {
64 CHECK(old_dex_caches == nullptr);
65 new_len = increase;
66 } else {
67 CHECK_EQ(old_methods->GetLength(), old_dex_caches->GetLength());
68 new_len = increase + old_methods->GetLength();
69 }
70 Handle<PointerArray> new_methods(hs.NewHandle<PointerArray>(
71 cl->AllocPointerArray(self, new_len)));
72 if (new_methods.IsNull()) {
73 // Fail.
74 self->AssertPendingOOMException();
75 return false;
76 }
77 Handle<ObjectArray<DexCache>> new_dex_caches(hs.NewHandle<ObjectArray<DexCache>>(
78 ObjectArray<DexCache>::Alloc(self,
79 cl->FindClass(self,
80 "[Ljava/lang/DexCache;",
81 ScopedNullHandle<ClassLoader>()),
82 new_len)));
83 if (new_dex_caches.IsNull()) {
84 // Fail.
85 self->AssertPendingOOMException();
86 return false;
87 }
88
89 if (!old_methods.IsNull()) {
90 // Copy the old contents.
91 new_methods->Memcpy(0,
92 old_methods.Get(),
93 0,
94 old_methods->GetLength(),
95 cl->GetImagePointerSize());
96 new_dex_caches->AsObjectArray<Object>()->AssignableCheckingMemcpy<false>(
97 0, old_dex_caches->AsObjectArray<Object>(), 0, old_dex_caches->GetLength(), false);
98 }
99 // Set the fields.
100 h_this->SetObsoleteArrays(new_methods.Get(), new_dex_caches.Get());
101
102 return true;
103 }
104
Alloc(Thread * self)105 ObjPtr<ClassExt> ClassExt::Alloc(Thread* self) {
106 return ObjPtr<ClassExt>::DownCast(GetClassRoot<ClassExt>()->AllocObject(self));
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
SetPreRedefineClassDefIndex(uint16_t index)122 void ClassExt::SetPreRedefineClassDefIndex(uint16_t index) {
123 DCHECK(!Runtime::Current()->IsActiveTransaction());
124 SetField32<false>(OFFSET_OF_OBJECT_MEMBER(ClassExt, pre_redefine_class_def_index_),
125 static_cast<int32_t>(index));
126 }
127
SetPreRedefineDexFile(const DexFile * dex_file)128 void ClassExt::SetPreRedefineDexFile(const DexFile* dex_file) {
129 DCHECK(!Runtime::Current()->IsActiveTransaction());
130 SetField64<false>(OFFSET_OF_OBJECT_MEMBER(ClassExt, pre_redefine_dex_file_ptr_),
131 static_cast<int64_t>(reinterpret_cast<uintptr_t>(dex_file)));
132 }
133
134 } // namespace mirror
135 } // namespace art
136