entrypoint_utils.cc revision 4fa0bcd2142793e1f105b24b658de3635652b957
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 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 return mirror::Array::Alloc<false>(self, klass, component_count, allocator_type); 87} 88 89// Helper function to allocate array for FILLED_NEW_ARRAY. 90mirror::Array* CheckAndAllocArrayFromCodeInstrumented(uint32_t type_idx, mirror::ArtMethod* referrer, 91 int32_t component_count, Thread* self, 92 bool access_check, 93 gc::AllocatorType allocator_type) { 94 mirror::Class* klass = CheckFilledNewArrayAlloc(type_idx, referrer, component_count, self, 95 access_check); 96 if (UNLIKELY(klass == nullptr)) { 97 return nullptr; 98 } 99 return mirror::Array::Alloc<true>(self, klass, component_count, allocator_type); 100} 101 102void ThrowStackOverflowError(Thread* self) { 103 if (self->IsHandlingStackOverflow()) { 104 LOG(ERROR) << "Recursive stack overflow."; 105 // We don't fail here because SetStackEndForStackOverflow will print better diagnostics. 106 } 107 108 if (Runtime::Current()->GetInstrumentation()->AreExitStubsInstalled()) { 109 // Remove extra entry pushed onto second stack during method tracing. 110 Runtime::Current()->GetInstrumentation()->PopMethodForUnwind(self, false); 111 } 112 113 self->SetStackEndForStackOverflow(); // Allow space on the stack for constructor to execute. 114 JNIEnvExt* env = self->GetJniEnv(); 115 std::string msg("stack size "); 116 msg += PrettySize(self->GetStackSize()); 117 // Use low-level JNI routine and pre-baked error class to avoid class linking operations that 118 // would consume more stack. 119 int rc = ::art::ThrowNewException(env, WellKnownClasses::java_lang_StackOverflowError, 120 msg.c_str(), NULL); 121 if (rc != JNI_OK) { 122 // TODO: ThrowNewException failed presumably because of an OOME, we continue to throw the OOME 123 // or die in the CHECK below. We may want to throw a pre-baked StackOverflowError 124 // instead. 125 LOG(ERROR) << "Couldn't throw new StackOverflowError because JNI ThrowNew failed."; 126 CHECK(self->IsExceptionPending()); 127 } 128 self->ResetDefaultStackEnd(); // Return to default stack size. 129} 130 131JValue InvokeProxyInvocationHandler(ScopedObjectAccessUnchecked& soa, const char* shorty, 132 jobject rcvr_jobj, jobject interface_method_jobj, 133 std::vector<jvalue>& args) { 134 DCHECK(soa.Env()->IsInstanceOf(rcvr_jobj, WellKnownClasses::java_lang_reflect_Proxy)); 135 136 // Build argument array possibly triggering GC. 137 soa.Self()->AssertThreadSuspensionIsAllowable(); 138 jobjectArray args_jobj = NULL; 139 const JValue zero; 140 if (args.size() > 0) { 141 args_jobj = soa.Env()->NewObjectArray(args.size(), WellKnownClasses::java_lang_Object, NULL); 142 if (args_jobj == NULL) { 143 CHECK(soa.Self()->IsExceptionPending()); 144 return zero; 145 } 146 for (size_t i = 0; i < args.size(); ++i) { 147 if (shorty[i + 1] == 'L') { 148 jobject val = args.at(i).l; 149 soa.Env()->SetObjectArrayElement(args_jobj, i, val); 150 } else { 151 JValue jv; 152 jv.SetJ(args.at(i).j); 153 mirror::Object* val = BoxPrimitive(Primitive::GetType(shorty[i + 1]), jv); 154 if (val == NULL) { 155 CHECK(soa.Self()->IsExceptionPending()); 156 return zero; 157 } 158 soa.Decode<mirror::ObjectArray<mirror::Object>* >(args_jobj)->Set(i, val); 159 } 160 } 161 } 162 163 // Call Proxy.invoke(Proxy proxy, ArtMethod method, Object[] args). 164 jvalue invocation_args[3]; 165 invocation_args[0].l = rcvr_jobj; 166 invocation_args[1].l = interface_method_jobj; 167 invocation_args[2].l = args_jobj; 168 jobject result = 169 soa.Env()->CallStaticObjectMethodA(WellKnownClasses::java_lang_reflect_Proxy, 170 WellKnownClasses::java_lang_reflect_Proxy_invoke, 171 invocation_args); 172 173 // Unbox result and handle error conditions. 174 if (LIKELY(!soa.Self()->IsExceptionPending())) { 175 if (shorty[0] == 'V' || (shorty[0] == 'L' && result == NULL)) { 176 // Do nothing. 177 return zero; 178 } else { 179 mirror::Object* result_ref = soa.Decode<mirror::Object*>(result); 180 mirror::Object* rcvr = soa.Decode<mirror::Object*>(rcvr_jobj); 181 mirror::ArtMethod* interface_method = 182 soa.Decode<mirror::ArtMethod*>(interface_method_jobj); 183 mirror::Class* result_type = MethodHelper(interface_method).GetReturnType(); 184 mirror::ArtMethod* proxy_method; 185 if (interface_method->GetDeclaringClass()->IsInterface()) { 186 proxy_method = rcvr->GetClass()->FindVirtualMethodForInterface(interface_method); 187 } else { 188 // Proxy dispatch to a method defined in Object. 189 DCHECK(interface_method->GetDeclaringClass()->IsObjectClass()); 190 proxy_method = interface_method; 191 } 192 ThrowLocation throw_location(rcvr, proxy_method, -1); 193 JValue result_unboxed; 194 if (!UnboxPrimitiveForResult(throw_location, result_ref, result_type, result_unboxed)) { 195 DCHECK(soa.Self()->IsExceptionPending()); 196 return zero; 197 } 198 return result_unboxed; 199 } 200 } else { 201 // In the case of checked exceptions that aren't declared, the exception must be wrapped by 202 // a UndeclaredThrowableException. 203 mirror::Throwable* exception = soa.Self()->GetException(NULL); 204 if (exception->IsCheckedException()) { 205 mirror::Object* rcvr = soa.Decode<mirror::Object*>(rcvr_jobj); 206 mirror::SynthesizedProxyClass* proxy_class = 207 down_cast<mirror::SynthesizedProxyClass*>(rcvr->GetClass()); 208 mirror::ArtMethod* interface_method = 209 soa.Decode<mirror::ArtMethod*>(interface_method_jobj); 210 mirror::ArtMethod* proxy_method = 211 rcvr->GetClass()->FindVirtualMethodForInterface(interface_method); 212 int throws_index = -1; 213 size_t num_virt_methods = proxy_class->NumVirtualMethods(); 214 for (size_t i = 0; i < num_virt_methods; i++) { 215 if (proxy_class->GetVirtualMethod(i) == proxy_method) { 216 throws_index = i; 217 break; 218 } 219 } 220 CHECK_NE(throws_index, -1); 221 mirror::ObjectArray<mirror::Class>* declared_exceptions = proxy_class->GetThrows()->Get(throws_index); 222 mirror::Class* exception_class = exception->GetClass(); 223 bool declares_exception = false; 224 for (int i = 0; i < declared_exceptions->GetLength() && !declares_exception; i++) { 225 mirror::Class* declared_exception = declared_exceptions->Get(i); 226 declares_exception = declared_exception->IsAssignableFrom(exception_class); 227 } 228 if (!declares_exception) { 229 ThrowLocation throw_location(rcvr, proxy_method, -1); 230 soa.Self()->ThrowNewWrappedException(throw_location, 231 "Ljava/lang/reflect/UndeclaredThrowableException;", 232 NULL); 233 } 234 } 235 return zero; 236 } 237} 238} // namespace art 239