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 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 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. 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 } 104 105 ObjPtr<ClassExt> ClassExt::Alloc(Thread* self) { 106 return ObjPtr<ClassExt>::DownCast(GetClassRoot<ClassExt>()->AllocObject(self)); 107 } 108 109 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 } 116 117 void ClassExt::SetOriginalDexFile(ObjPtr<Object> bytes) { 118 DCHECK(!Runtime::Current()->IsActiveTransaction()); 119 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(ClassExt, original_dex_file_), bytes); 120 } 121 122 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 } 127 128 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
