1 /* 2 * Copyright (C) 2011 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_LINKER_INL_H_ 18 #define ART_RUNTIME_CLASS_LINKER_INL_H_ 19 20 #include "class_linker.h" 21 #include "gc_root-inl.h" 22 #include "gc/heap-inl.h" 23 #include "mirror/art_field.h" 24 #include "mirror/class_loader.h" 25 #include "mirror/dex_cache-inl.h" 26 #include "mirror/iftable.h" 27 #include "mirror/object_array.h" 28 #include "handle_scope-inl.h" 29 30 namespace art { 31 32 inline mirror::Class* ClassLinker::FindSystemClass(Thread* self, const char* descriptor) { 33 return FindClass(self, descriptor, NullHandle<mirror::ClassLoader>()); 34 } 35 36 inline mirror::Class* ClassLinker::FindArrayClass(Thread* self, mirror::Class** element_class) { 37 for (size_t i = 0; i < kFindArrayCacheSize; ++i) { 38 // Read the cached array class once to avoid races with other threads setting it. 39 mirror::Class* array_class = find_array_class_cache_[i].Read(); 40 if (array_class != nullptr && array_class->GetComponentType() == *element_class) { 41 return array_class; 42 } 43 } 44 DCHECK(!(*element_class)->IsPrimitiveVoid()); 45 std::string descriptor = "["; 46 std::string temp; 47 descriptor += (*element_class)->GetDescriptor(&temp); 48 StackHandleScope<2> hs(Thread::Current()); 49 Handle<mirror::ClassLoader> class_loader(hs.NewHandle((*element_class)->GetClassLoader())); 50 HandleWrapper<mirror::Class> h_element_class(hs.NewHandleWrapper(element_class)); 51 mirror::Class* array_class = FindClass(self, descriptor.c_str(), class_loader); 52 // Benign races in storing array class and incrementing index. 53 size_t victim_index = find_array_class_cache_next_victim_; 54 find_array_class_cache_[victim_index] = GcRoot<mirror::Class>(array_class); 55 find_array_class_cache_next_victim_ = (victim_index + 1) % kFindArrayCacheSize; 56 return array_class; 57 } 58 59 inline mirror::String* ClassLinker::ResolveString(uint32_t string_idx, 60 mirror::ArtMethod* referrer) { 61 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 62 mirror::String* resolved_string = declaring_class->GetDexCacheStrings()->Get(string_idx); 63 if (UNLIKELY(resolved_string == NULL)) { 64 StackHandleScope<1> hs(Thread::Current()); 65 Handle<mirror::DexCache> dex_cache(hs.NewHandle(declaring_class->GetDexCache())); 66 const DexFile& dex_file = *dex_cache->GetDexFile(); 67 resolved_string = ResolveString(dex_file, string_idx, dex_cache); 68 if (resolved_string != nullptr) { 69 DCHECK_EQ(dex_cache->GetResolvedString(string_idx), resolved_string); 70 } 71 } 72 return resolved_string; 73 } 74 75 inline mirror::Class* ClassLinker::ResolveType(uint16_t type_idx, 76 mirror::ArtMethod* referrer) { 77 mirror::Class* resolved_type = referrer->GetDexCacheResolvedType(type_idx); 78 if (UNLIKELY(resolved_type == nullptr)) { 79 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 80 StackHandleScope<2> hs(Thread::Current()); 81 Handle<mirror::DexCache> dex_cache(hs.NewHandle(declaring_class->GetDexCache())); 82 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(declaring_class->GetClassLoader())); 83 const DexFile& dex_file = *dex_cache->GetDexFile(); 84 resolved_type = ResolveType(dex_file, type_idx, dex_cache, class_loader); 85 // Note: We cannot check here to see whether we added the type to the cache. The type 86 // might be an erroneous class, which results in it being hidden from us. 87 } 88 return resolved_type; 89 } 90 91 inline mirror::Class* ClassLinker::ResolveType(uint16_t type_idx, mirror::ArtField* referrer) { 92 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 93 mirror::DexCache* dex_cache_ptr = declaring_class->GetDexCache(); 94 mirror::Class* resolved_type = dex_cache_ptr->GetResolvedType(type_idx); 95 if (UNLIKELY(resolved_type == NULL)) { 96 StackHandleScope<2> hs(Thread::Current()); 97 Handle<mirror::DexCache> dex_cache(hs.NewHandle(dex_cache_ptr)); 98 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(declaring_class->GetClassLoader())); 99 const DexFile& dex_file = *dex_cache->GetDexFile(); 100 resolved_type = ResolveType(dex_file, type_idx, dex_cache, class_loader); 101 // Note: We cannot check here to see whether we added the type to the cache. The type 102 // might be an erroneous class, which results in it being hidden from us. 103 } 104 return resolved_type; 105 } 106 107 inline mirror::ArtMethod* ClassLinker::GetResolvedMethod(uint32_t method_idx, 108 mirror::ArtMethod* referrer, 109 InvokeType type) { 110 mirror::ArtMethod* resolved_method = referrer->GetDexCacheResolvedMethod(method_idx); 111 if (resolved_method == nullptr || resolved_method->IsRuntimeMethod()) { 112 return nullptr; 113 } 114 return resolved_method; 115 } 116 117 inline mirror::ArtMethod* ClassLinker::ResolveMethod(Thread* self, uint32_t method_idx, 118 mirror::ArtMethod** referrer, 119 InvokeType type) { 120 mirror::ArtMethod* resolved_method = GetResolvedMethod(method_idx, *referrer, type); 121 if (LIKELY(resolved_method != nullptr)) { 122 return resolved_method; 123 } 124 mirror::Class* declaring_class = (*referrer)->GetDeclaringClass(); 125 StackHandleScope<3> hs(self); 126 Handle<mirror::DexCache> h_dex_cache(hs.NewHandle(declaring_class->GetDexCache())); 127 Handle<mirror::ClassLoader> h_class_loader(hs.NewHandle(declaring_class->GetClassLoader())); 128 HandleWrapper<mirror::ArtMethod> h_referrer(hs.NewHandleWrapper(referrer)); 129 const DexFile* dex_file = h_dex_cache->GetDexFile(); 130 resolved_method = ResolveMethod(*dex_file, method_idx, h_dex_cache, h_class_loader, h_referrer, 131 type); 132 // Note: We cannot check here to see whether we added the method to the cache. It 133 // might be an erroneous class, which results in it being hidden from us. 134 return resolved_method; 135 } 136 137 inline mirror::ArtField* ClassLinker::GetResolvedField(uint32_t field_idx, 138 mirror::Class* field_declaring_class) { 139 return field_declaring_class->GetDexCache()->GetResolvedField(field_idx); 140 } 141 142 inline mirror::ArtField* ClassLinker::ResolveField(uint32_t field_idx, mirror::ArtMethod* referrer, 143 bool is_static) { 144 mirror::Class* declaring_class = referrer->GetDeclaringClass(); 145 mirror::ArtField* resolved_field = GetResolvedField(field_idx, declaring_class); 146 if (UNLIKELY(resolved_field == NULL)) { 147 StackHandleScope<2> hs(Thread::Current()); 148 Handle<mirror::DexCache> dex_cache(hs.NewHandle(declaring_class->GetDexCache())); 149 Handle<mirror::ClassLoader> class_loader(hs.NewHandle(declaring_class->GetClassLoader())); 150 const DexFile& dex_file = *dex_cache->GetDexFile(); 151 resolved_field = ResolveField(dex_file, field_idx, dex_cache, class_loader, is_static); 152 // Note: We cannot check here to see whether we added the field to the cache. The type 153 // might be an erroneous class, which results in it being hidden from us. 154 } 155 return resolved_field; 156 } 157 158 template <class T> 159 inline mirror::ObjectArray<T>* ClassLinker::AllocObjectArray(Thread* self, size_t length) { 160 return mirror::ObjectArray<T>::Alloc(self, GetClassRoot(kObjectArrayClass), length); 161 } 162 163 inline mirror::ObjectArray<mirror::Class>* ClassLinker::AllocClassArray(Thread* self, 164 size_t length) { 165 return mirror::ObjectArray<mirror::Class>::Alloc(self, GetClassRoot(kClassArrayClass), length); 166 } 167 168 inline mirror::ObjectArray<mirror::String>* ClassLinker::AllocStringArray(Thread* self, 169 size_t length) { 170 return mirror::ObjectArray<mirror::String>::Alloc(self, GetClassRoot(kJavaLangStringArrayClass), 171 length); 172 } 173 174 inline mirror::ObjectArray<mirror::ArtMethod>* ClassLinker::AllocArtMethodArray(Thread* self, 175 size_t length) { 176 return mirror::ObjectArray<mirror::ArtMethod>::Alloc(self, 177 GetClassRoot(kJavaLangReflectArtMethodArrayClass), length); 178 } 179 180 inline mirror::IfTable* ClassLinker::AllocIfTable(Thread* self, size_t ifcount) { 181 return down_cast<mirror::IfTable*>( 182 mirror::IfTable::Alloc(self, GetClassRoot(kObjectArrayClass), 183 ifcount * mirror::IfTable::kMax)); 184 } 185 186 inline mirror::ObjectArray<mirror::ArtField>* ClassLinker::AllocArtFieldArray(Thread* self, 187 size_t length) { 188 gc::Heap* const heap = Runtime::Current()->GetHeap(); 189 // Can't have movable field arrays for mark compact since we need these arrays to always be valid 190 // so that we can do Object::VisitReferences in the case where the fields don't fit in the 191 // reference offsets word. 192 return mirror::ObjectArray<mirror::ArtField>::Alloc( 193 self, GetClassRoot(kJavaLangReflectArtFieldArrayClass), length, 194 kMoveFieldArrays ? heap->GetCurrentAllocator() : heap->GetCurrentNonMovingAllocator()); 195 } 196 197 inline mirror::Class* ClassLinker::GetClassRoot(ClassRoot class_root) 198 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 199 DCHECK(!class_roots_.IsNull()); 200 mirror::ObjectArray<mirror::Class>* class_roots = class_roots_.Read(); 201 mirror::Class* klass = class_roots->Get(class_root); 202 DCHECK(klass != NULL); 203 return klass; 204 } 205 206 inline mirror::DexCache* ClassLinker::GetDexCache(size_t idx) { 207 dex_lock_.AssertSharedHeld(Thread::Current()); 208 DCHECK(idx < dex_caches_.size()); 209 return dex_caches_[idx].Read(); 210 } 211 212 } // namespace art 213 214 #endif // ART_RUNTIME_CLASS_LINKER_INL_H_ 215
