entrypoint_utils.cc revision d4beb6bc2b42b176c6d04fdd91d6c758e542c7c2
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 "class_linker-inl.h" 20#include "dex_file-inl.h" 21#include "gc/accounting/card_table-inl.h" 22#include "mirror/art_field-inl.h" 23#include "mirror/art_method-inl.h" 24#include "mirror/class-inl.h" 25#include "mirror/object-inl.h" 26#include "object_utils.h" 27#include "mirror/object_array-inl.h" 28#include "mirror/proxy.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 bool CheckFilledNewArrayAlloc(uint32_t type_idx, mirror::ArtMethod* referrer, 37 int32_t component_count, Thread* self, 38 bool access_check, mirror::Class** klass_ptr) 39 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 40 if (UNLIKELY(component_count < 0)) { 41 ThrowNegativeArraySizeException(component_count); 42 return false; // 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 false; // 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 false; // 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 false; // Failure 70 } 71 } 72 DCHECK(klass->IsArrayClass()) << PrettyClass(klass); 73 *klass_ptr = klass; 74 return true; 75} 76 77// Helper function to allocate array for FILLED_NEW_ARRAY. 78mirror::Array* CheckAndAllocArrayFromCode(uint32_t type_idx, mirror::ArtMethod* referrer, 79 int32_t component_count, Thread* self, 80 bool access_check) { 81 mirror::Class* klass; 82 if (UNLIKELY(!CheckFilledNewArrayAlloc(type_idx, referrer, component_count, self, access_check, &klass))) { 83 return NULL; 84 } 85 return mirror::Array::AllocUninstrumented(self, klass, component_count); 86} 87 88// Helper function to allocate array for FILLED_NEW_ARRAY. 89mirror::Array* CheckAndAllocArrayFromCodeInstrumented(uint32_t type_idx, mirror::ArtMethod* referrer, 90 int32_t component_count, Thread* self, 91 bool access_check) { 92 mirror::Class* klass; 93 if (UNLIKELY(!CheckFilledNewArrayAlloc(type_idx, referrer, component_count, self, access_check, &klass))) { 94 return NULL; 95 } 96 return mirror::Array::AllocInstrumented(self, klass, component_count); 97} 98 99void ThrowStackOverflowError(Thread* self) { 100 if (self->IsHandlingStackOverflow()) { 101 LOG(ERROR) << "Recursive stack overflow."; 102 // We don't fail here because SetStackEndForStackOverflow will print better diagnostics. 103 } 104 105 if (Runtime::Current()->GetInstrumentation()->AreExitStubsInstalled()) { 106 // Remove extra entry pushed onto second stack during method tracing. 107 Runtime::Current()->GetInstrumentation()->PopMethodForUnwind(self, false); 108 } 109 110 self->SetStackEndForStackOverflow(); // Allow space on the stack for constructor to execute. 111 JNIEnvExt* env = self->GetJniEnv(); 112 std::string msg("stack size "); 113 msg += PrettySize(self->GetStackSize()); 114 // Use low-level JNI routine and pre-baked error class to avoid class linking operations that 115 // would consume more stack. 116 int rc = ::art::ThrowNewException(env, WellKnownClasses::java_lang_StackOverflowError, 117 msg.c_str(), NULL); 118 if (rc != JNI_OK) { 119 // TODO: ThrowNewException failed presumably because of an OOME, we continue to throw the OOME 120 // or die in the CHECK below. We may want to throw a pre-baked StackOverflowError 121 // instead. 122 LOG(ERROR) << "Couldn't throw new StackOverflowError because JNI ThrowNew failed."; 123 CHECK(self->IsExceptionPending()); 124 } 125 self->ResetDefaultStackEnd(); // Return to default stack size. 126} 127 128JValue InvokeProxyInvocationHandler(ScopedObjectAccessUnchecked& soa, const char* shorty, 129 jobject rcvr_jobj, jobject interface_method_jobj, 130 std::vector<jvalue>& args) { 131 DCHECK(soa.Env()->IsInstanceOf(rcvr_jobj, WellKnownClasses::java_lang_reflect_Proxy)); 132 133 // Build argument array possibly triggering GC. 134 soa.Self()->AssertThreadSuspensionIsAllowable(); 135 jobjectArray args_jobj = NULL; 136 const JValue zero; 137 if (args.size() > 0) { 138 args_jobj = soa.Env()->NewObjectArray(args.size(), WellKnownClasses::java_lang_Object, NULL); 139 if (args_jobj == NULL) { 140 CHECK(soa.Self()->IsExceptionPending()); 141 return zero; 142 } 143 for (size_t i = 0; i < args.size(); ++i) { 144 if (shorty[i + 1] == 'L') { 145 jobject val = args.at(i).l; 146 soa.Env()->SetObjectArrayElement(args_jobj, i, val); 147 } else { 148 JValue jv; 149 jv.SetJ(args.at(i).j); 150 mirror::Object* val = BoxPrimitive(Primitive::GetType(shorty[i + 1]), jv); 151 if (val == NULL) { 152 CHECK(soa.Self()->IsExceptionPending()); 153 return zero; 154 } 155 soa.Decode<mirror::ObjectArray<mirror::Object>* >(args_jobj)->Set(i, val); 156 } 157 } 158 } 159 160 // Call Proxy.invoke(Proxy proxy, ArtMethod method, Object[] args). 161 jvalue invocation_args[3]; 162 invocation_args[0].l = rcvr_jobj; 163 invocation_args[1].l = interface_method_jobj; 164 invocation_args[2].l = args_jobj; 165 jobject result = 166 soa.Env()->CallStaticObjectMethodA(WellKnownClasses::java_lang_reflect_Proxy, 167 WellKnownClasses::java_lang_reflect_Proxy_invoke, 168 invocation_args); 169 170 // Unbox result and handle error conditions. 171 if (LIKELY(!soa.Self()->IsExceptionPending())) { 172 if (shorty[0] == 'V' || (shorty[0] == 'L' && result == NULL)) { 173 // Do nothing. 174 return zero; 175 } else { 176 mirror::Object* result_ref = soa.Decode<mirror::Object*>(result); 177 mirror::Object* rcvr = soa.Decode<mirror::Object*>(rcvr_jobj); 178 mirror::ArtMethod* interface_method = 179 soa.Decode<mirror::ArtMethod*>(interface_method_jobj); 180 mirror::Class* result_type = MethodHelper(interface_method).GetReturnType(); 181 mirror::ArtMethod* proxy_method; 182 if (interface_method->GetDeclaringClass()->IsInterface()) { 183 proxy_method = rcvr->GetClass()->FindVirtualMethodForInterface(interface_method); 184 } else { 185 // Proxy dispatch to a method defined in Object. 186 DCHECK(interface_method->GetDeclaringClass()->IsObjectClass()); 187 proxy_method = interface_method; 188 } 189 ThrowLocation throw_location(rcvr, proxy_method, -1); 190 JValue result_unboxed; 191 if (!UnboxPrimitiveForResult(throw_location, result_ref, result_type, result_unboxed)) { 192 DCHECK(soa.Self()->IsExceptionPending()); 193 return zero; 194 } 195 return result_unboxed; 196 } 197 } else { 198 // In the case of checked exceptions that aren't declared, the exception must be wrapped by 199 // a UndeclaredThrowableException. 200 mirror::Throwable* exception = soa.Self()->GetException(NULL); 201 if (exception->IsCheckedException()) { 202 mirror::Object* rcvr = soa.Decode<mirror::Object*>(rcvr_jobj); 203 mirror::SynthesizedProxyClass* proxy_class = 204 down_cast<mirror::SynthesizedProxyClass*>(rcvr->GetClass()); 205 mirror::ArtMethod* interface_method = 206 soa.Decode<mirror::ArtMethod*>(interface_method_jobj); 207 mirror::ArtMethod* proxy_method = 208 rcvr->GetClass()->FindVirtualMethodForInterface(interface_method); 209 int throws_index = -1; 210 size_t num_virt_methods = proxy_class->NumVirtualMethods(); 211 for (size_t i = 0; i < num_virt_methods; i++) { 212 if (proxy_class->GetVirtualMethod(i) == proxy_method) { 213 throws_index = i; 214 break; 215 } 216 } 217 CHECK_NE(throws_index, -1); 218 mirror::ObjectArray<mirror::Class>* declared_exceptions = proxy_class->GetThrows()->Get(throws_index); 219 mirror::Class* exception_class = exception->GetClass(); 220 bool declares_exception = false; 221 for (int i = 0; i < declared_exceptions->GetLength() && !declares_exception; i++) { 222 mirror::Class* declared_exception = declared_exceptions->Get(i); 223 declares_exception = declared_exception->IsAssignableFrom(exception_class); 224 } 225 if (!declares_exception) { 226 ThrowLocation throw_location(rcvr, proxy_method, -1); 227 soa.Self()->ThrowNewWrappedException(throw_location, 228 "Ljava/lang/reflect/UndeclaredThrowableException;", 229 NULL); 230 } 231 } 232 return zero; 233 } 234} 235} // namespace art 236