entrypoint_utils.cc revision e5877a12c30afe10a5c6a1afaff7a47ef44a2a5f
1/* 2 * Copyright (C) 2012 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 "entrypoints/entrypoint_utils.h" 18 19#include "base/mutex.h" 20#include "class_linker-inl.h" 21#include "dex_file-inl.h" 22#include "gc/accounting/card_table-inl.h" 23#include "method_helper-inl.h" 24#include "mirror/art_field-inl.h" 25#include "mirror/art_method-inl.h" 26#include "mirror/class-inl.h" 27#include "mirror/object-inl.h" 28#include "mirror/object_array-inl.h" 29#include "reflection.h" 30#include "scoped_thread_state_change.h" 31#include "ScopedLocalRef.h" 32#include "well_known_classes.h" 33 34namespace art { 35 36static inline mirror::Class* CheckFilledNewArrayAlloc(uint32_t type_idx, mirror::ArtMethod* referrer, 37 int32_t component_count, Thread* self, 38 bool access_check) 39 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 40 if (UNLIKELY(component_count < 0)) { 41 ThrowNegativeArraySizeException(component_count); 42 return nullptr; // Failure 43 } 44 mirror::Class* klass = referrer->GetDexCacheResolvedTypes()->GetWithoutChecks(type_idx); 45 if (UNLIKELY(klass == NULL)) { // Not in dex cache so try to resolve 46 klass = Runtime::Current()->GetClassLinker()->ResolveType(type_idx, referrer); 47 if (klass == NULL) { // Error 48 DCHECK(self->IsExceptionPending()); 49 return nullptr; // Failure 50 } 51 } 52 if (UNLIKELY(klass->IsPrimitive() && !klass->IsPrimitiveInt())) { 53 if (klass->IsPrimitiveLong() || klass->IsPrimitiveDouble()) { 54 ThrowRuntimeException("Bad filled array request for type %s", 55 PrettyDescriptor(klass).c_str()); 56 } else { 57 ThrowLocation throw_location = self->GetCurrentLocationForThrow(); 58 DCHECK(throw_location.GetMethod() == referrer); 59 self->ThrowNewExceptionF(throw_location, "Ljava/lang/InternalError;", 60 "Found type %s; filled-new-array not implemented for anything but 'int'", 61 PrettyDescriptor(klass).c_str()); 62 } 63 return nullptr; // Failure 64 } 65 if (access_check) { 66 mirror::Class* referrer_klass = referrer->GetDeclaringClass(); 67 if (UNLIKELY(!referrer_klass->CanAccess(klass))) { 68 ThrowIllegalAccessErrorClass(referrer_klass, klass); 69 return nullptr; // Failure 70 } 71 } 72 DCHECK(klass->IsArrayClass()) << PrettyClass(klass); 73 return klass; 74} 75 76// Helper function to allocate array for FILLED_NEW_ARRAY. 77mirror::Array* CheckAndAllocArrayFromCode(uint32_t type_idx, mirror::ArtMethod* referrer, 78 int32_t component_count, Thread* self, 79 bool access_check, 80 gc::AllocatorType /* allocator_type */) { 81 mirror::Class* klass = CheckFilledNewArrayAlloc(type_idx, referrer, component_count, self, 82 access_check); 83 if (UNLIKELY(klass == nullptr)) { 84 return nullptr; 85 } 86 // Always go slow path for now, filled new array is not common. 87 gc::Heap* heap = Runtime::Current()->GetHeap(); 88 // Use the current allocator type in case CheckFilledNewArrayAlloc caused us to suspend and then 89 // the heap switched the allocator type while we were suspended. 90 return mirror::Array::Alloc<false>(self, klass, component_count, klass->GetComponentSize(), 91 heap->GetCurrentAllocator()); 92} 93 94// Helper function to allocate array for FILLED_NEW_ARRAY. 95mirror::Array* CheckAndAllocArrayFromCodeInstrumented(uint32_t type_idx, mirror::ArtMethod* referrer, 96 int32_t component_count, Thread* self, 97 bool access_check, 98 gc::AllocatorType /* allocator_type */) { 99 mirror::Class* klass = CheckFilledNewArrayAlloc(type_idx, referrer, component_count, self, 100 access_check); 101 if (UNLIKELY(klass == nullptr)) { 102 return nullptr; 103 } 104 gc::Heap* heap = Runtime::Current()->GetHeap(); 105 // Use the current allocator type in case CheckFilledNewArrayAlloc caused us to suspend and then 106 // the heap switched the allocator type while we were suspended. 107 return mirror::Array::Alloc<true>(self, klass, component_count, klass->GetComponentSize(), 108 heap->GetCurrentAllocator()); 109} 110 111void ThrowStackOverflowError(Thread* self) { 112 if (self->IsHandlingStackOverflow()) { 113 LOG(ERROR) << "Recursive stack overflow."; 114 // We don't fail here because SetStackEndForStackOverflow will print better diagnostics. 115 } 116 117 if (Runtime::Current()->GetInstrumentation()->AreExitStubsInstalled()) { 118 // Remove extra entry pushed onto second stack during method tracing. 119 Runtime::Current()->GetInstrumentation()->PopMethodForUnwind(self, false); 120 } 121 122 self->SetStackEndForStackOverflow(); // Allow space on the stack for constructor to execute. 123 JNIEnvExt* env = self->GetJniEnv(); 124 std::string msg("stack size "); 125 msg += PrettySize(self->GetStackSize()); 126 // Use low-level JNI routine and pre-baked error class to avoid class linking operations that 127 // would consume more stack. 128 int rc = ::art::ThrowNewException(env, WellKnownClasses::java_lang_StackOverflowError, 129 msg.c_str(), NULL); 130 if (rc != JNI_OK) { 131 // TODO: ThrowNewException failed presumably because of an OOME, we continue to throw the OOME 132 // or die in the CHECK below. We may want to throw a pre-baked StackOverflowError 133 // instead. 134 LOG(ERROR) << "Couldn't throw new StackOverflowError because JNI ThrowNew failed."; 135 CHECK(self->IsExceptionPending()); 136 } 137 138 bool explicit_overflow_check = Runtime::Current()->ExplicitStackOverflowChecks(); 139 self->ResetDefaultStackEnd(!explicit_overflow_check); // Return to default stack size. 140} 141 142void CheckReferenceResult(mirror::Object* o, Thread* self) { 143 if (o == NULL) { 144 return; 145 } 146 mirror::ArtMethod* m = self->GetCurrentMethod(NULL); 147 if (o == kInvalidIndirectRefObject) { 148 JniAbortF(NULL, "invalid reference returned from %s", PrettyMethod(m).c_str()); 149 } 150 // Make sure that the result is an instance of the type this method was expected to return. 151 StackHandleScope<1> hs(self); 152 Handle<mirror::ArtMethod> h_m(hs.NewHandle(m)); 153 mirror::Class* return_type = MethodHelper(h_m).GetReturnType(); 154 155 if (!o->InstanceOf(return_type)) { 156 JniAbortF(NULL, "attempt to return an instance of %s from %s", PrettyTypeOf(o).c_str(), 157 PrettyMethod(h_m.Get()).c_str()); 158 } 159} 160 161JValue InvokeProxyInvocationHandler(ScopedObjectAccessAlreadyRunnable& soa, const char* shorty, 162 jobject rcvr_jobj, jobject interface_method_jobj, 163 std::vector<jvalue>& args) { 164 DCHECK(soa.Env()->IsInstanceOf(rcvr_jobj, WellKnownClasses::java_lang_reflect_Proxy)); 165 166 // Build argument array possibly triggering GC. 167 soa.Self()->AssertThreadSuspensionIsAllowable(); 168 jobjectArray args_jobj = NULL; 169 const JValue zero; 170 int32_t target_sdk_version = Runtime::Current()->GetTargetSdkVersion(); 171 // Do not create empty arrays unless needed to maintain Dalvik bug compatibility. 172 if (args.size() > 0 || (target_sdk_version > 0 && target_sdk_version <= 21)) { 173 args_jobj = soa.Env()->NewObjectArray(args.size(), WellKnownClasses::java_lang_Object, NULL); 174 if (args_jobj == NULL) { 175 CHECK(soa.Self()->IsExceptionPending()); 176 return zero; 177 } 178 for (size_t i = 0; i < args.size(); ++i) { 179 if (shorty[i + 1] == 'L') { 180 jobject val = args.at(i).l; 181 soa.Env()->SetObjectArrayElement(args_jobj, i, val); 182 } else { 183 JValue jv; 184 jv.SetJ(args.at(i).j); 185 mirror::Object* val = BoxPrimitive(Primitive::GetType(shorty[i + 1]), jv); 186 if (val == NULL) { 187 CHECK(soa.Self()->IsExceptionPending()); 188 return zero; 189 } 190 soa.Decode<mirror::ObjectArray<mirror::Object>* >(args_jobj)->Set<false>(i, val); 191 } 192 } 193 } 194 195 // Call Proxy.invoke(Proxy proxy, ArtMethod method, Object[] args). 196 jvalue invocation_args[3]; 197 invocation_args[0].l = rcvr_jobj; 198 invocation_args[1].l = interface_method_jobj; 199 invocation_args[2].l = args_jobj; 200 jobject result = 201 soa.Env()->CallStaticObjectMethodA(WellKnownClasses::java_lang_reflect_Proxy, 202 WellKnownClasses::java_lang_reflect_Proxy_invoke, 203 invocation_args); 204 205 // Unbox result and handle error conditions. 206 if (LIKELY(!soa.Self()->IsExceptionPending())) { 207 if (shorty[0] == 'V' || (shorty[0] == 'L' && result == NULL)) { 208 // Do nothing. 209 return zero; 210 } else { 211 StackHandleScope<1> hs(soa.Self()); 212 MethodHelper mh_interface_method( 213 hs.NewHandle(soa.Decode<mirror::ArtMethod*>(interface_method_jobj))); 214 // This can cause thread suspension. 215 mirror::Class* result_type = mh_interface_method.GetReturnType(); 216 mirror::Object* result_ref = soa.Decode<mirror::Object*>(result); 217 mirror::Object* rcvr = soa.Decode<mirror::Object*>(rcvr_jobj); 218 mirror::ArtMethod* proxy_method; 219 if (mh_interface_method.GetMethod()->GetDeclaringClass()->IsInterface()) { 220 proxy_method = rcvr->GetClass()->FindVirtualMethodForInterface( 221 mh_interface_method.GetMethod()); 222 } else { 223 // Proxy dispatch to a method defined in Object. 224 DCHECK(mh_interface_method.GetMethod()->GetDeclaringClass()->IsObjectClass()); 225 proxy_method = mh_interface_method.GetMethod(); 226 } 227 ThrowLocation throw_location(rcvr, proxy_method, -1); 228 JValue result_unboxed; 229 if (!UnboxPrimitiveForResult(throw_location, result_ref, result_type, &result_unboxed)) { 230 DCHECK(soa.Self()->IsExceptionPending()); 231 return zero; 232 } 233 return result_unboxed; 234 } 235 } else { 236 // In the case of checked exceptions that aren't declared, the exception must be wrapped by 237 // a UndeclaredThrowableException. 238 mirror::Throwable* exception = soa.Self()->GetException(NULL); 239 if (exception->IsCheckedException()) { 240 mirror::Object* rcvr = soa.Decode<mirror::Object*>(rcvr_jobj); 241 mirror::Class* proxy_class = rcvr->GetClass(); 242 mirror::ArtMethod* interface_method = 243 soa.Decode<mirror::ArtMethod*>(interface_method_jobj); 244 mirror::ArtMethod* proxy_method = 245 rcvr->GetClass()->FindVirtualMethodForInterface(interface_method); 246 int throws_index = -1; 247 size_t num_virt_methods = proxy_class->NumVirtualMethods(); 248 for (size_t i = 0; i < num_virt_methods; i++) { 249 if (proxy_class->GetVirtualMethod(i) == proxy_method) { 250 throws_index = i; 251 break; 252 } 253 } 254 CHECK_NE(throws_index, -1); 255 mirror::ObjectArray<mirror::Class>* declared_exceptions = proxy_class->GetThrows()->Get(throws_index); 256 mirror::Class* exception_class = exception->GetClass(); 257 bool declares_exception = false; 258 for (int i = 0; i < declared_exceptions->GetLength() && !declares_exception; i++) { 259 mirror::Class* declared_exception = declared_exceptions->Get(i); 260 declares_exception = declared_exception->IsAssignableFrom(exception_class); 261 } 262 if (!declares_exception) { 263 ThrowLocation throw_location(rcvr, proxy_method, -1); 264 soa.Self()->ThrowNewWrappedException(throw_location, 265 "Ljava/lang/reflect/UndeclaredThrowableException;", 266 NULL); 267 } 268 } 269 return zero; 270 } 271} 272} // namespace art 273