| /* |
| * Copyright 2012 Google Inc. All Rights Reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "runtime_support.h" |
| |
| namespace art { |
| |
| void ThrowNewIllegalAccessErrorClass(Thread* self, |
| Class* referrer, |
| Class* accessed) { |
| self->ThrowNewExceptionF("Ljava/lang/IllegalAccessError;", |
| "illegal class access: '%s' -> '%s'", |
| PrettyDescriptor(referrer).c_str(), |
| PrettyDescriptor(accessed).c_str()); |
| } |
| |
| void ThrowNewIllegalAccessErrorClassForMethodDispatch(Thread* self, |
| Class* referrer, |
| Class* accessed, |
| const Method* caller, |
| const Method* called, |
| InvokeType type) { |
| std::ostringstream type_stream; |
| type_stream << type; |
| self->ThrowNewExceptionF("Ljava/lang/IllegalAccessError;", |
| "illegal class access ('%s' -> '%s')" |
| "in attempt to invoke %s method '%s' from '%s'", |
| PrettyDescriptor(referrer).c_str(), |
| PrettyDescriptor(accessed).c_str(), |
| type_stream.str().c_str(), |
| PrettyMethod(called).c_str(), |
| PrettyMethod(caller).c_str()); |
| } |
| |
| void ThrowNewIncompatibleClassChangeErrorClassForInterfaceDispatch(Thread* self, |
| const Method* referrer, |
| const Method* interface_method, |
| Object* this_object) { |
| self->ThrowNewExceptionF("Ljava/lang/IncompatibleClassChangeError;", |
| "class '%s' does not implement interface '%s' in call to '%s' from '%s'", |
| PrettyDescriptor(this_object->GetClass()).c_str(), |
| PrettyDescriptor(interface_method->GetDeclaringClass()).c_str(), |
| PrettyMethod(interface_method).c_str(), PrettyMethod(referrer).c_str()); |
| } |
| |
| void ThrowNewIllegalAccessErrorField(Thread* self, |
| Class* referrer, |
| Field* accessed) { |
| self->ThrowNewExceptionF("Ljava/lang/IllegalAccessError;", |
| "Field '%s' is inaccessible to class '%s'", |
| PrettyField(accessed, false).c_str(), |
| PrettyDescriptor(referrer).c_str()); |
| } |
| |
| void ThrowNewIllegalAccessErrorFinalField(Thread* self, |
| const Method* referrer, |
| Field* accessed) { |
| self->ThrowNewExceptionF("Ljava/lang/IllegalAccessError;", |
| "Final field '%s' cannot be written to by method '%s'", |
| PrettyField(accessed, false).c_str(), |
| PrettyMethod(referrer).c_str()); |
| } |
| |
| void ThrowNewIllegalAccessErrorMethod(Thread* self, |
| Class* referrer, |
| Method* accessed) { |
| self->ThrowNewExceptionF("Ljava/lang/IllegalAccessError;", |
| "Method '%s' is inaccessible to class '%s'", |
| PrettyMethod(accessed).c_str(), |
| PrettyDescriptor(referrer).c_str()); |
| } |
| |
| void ThrowNullPointerExceptionForFieldAccess(Thread* self, |
| Field* field, |
| bool is_read) { |
| self->ThrowNewExceptionF("Ljava/lang/NullPointerException;", |
| "Attempt to %s field '%s' on a null object reference", |
| is_read ? "read from" : "write to", |
| PrettyField(field, true).c_str()); |
| } |
| |
| void ThrowNullPointerExceptionForMethodAccess(Thread* self, |
| Method* caller, |
| uint32_t method_idx, |
| InvokeType type) { |
| const DexFile& dex_file = |
| Runtime::Current()->GetClassLinker()->FindDexFile(caller->GetDeclaringClass()->GetDexCache()); |
| std::ostringstream type_stream; |
| type_stream << type; |
| self->ThrowNewExceptionF("Ljava/lang/NullPointerException;", |
| "Attempt to invoke %s method '%s' on a null object reference", |
| type_stream.str().c_str(), |
| PrettyMethod(method_idx, dex_file, true).c_str()); |
| } |
| |
| std::string FieldNameFromIndex(const Method* method, uint32_t ref, |
| verifier::VerifyErrorRefType ref_type, bool access) { |
| CHECK_EQ(static_cast<int>(ref_type), static_cast<int>(verifier::VERIFY_ERROR_REF_FIELD)); |
| |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| const DexFile& dex_file = class_linker->FindDexFile(method->GetDeclaringClass()->GetDexCache()); |
| |
| const DexFile::FieldId& id = dex_file.GetFieldId(ref); |
| std::string class_name(PrettyDescriptor(dex_file.GetFieldDeclaringClassDescriptor(id))); |
| const char* field_name = dex_file.StringDataByIdx(id.name_idx_); |
| if (!access) { |
| return class_name + "." + field_name; |
| } |
| |
| std::string result; |
| result += "tried to access field "; |
| result += class_name + "." + field_name; |
| result += " from class "; |
| result += PrettyDescriptor(method->GetDeclaringClass()); |
| return result; |
| } |
| |
| std::string MethodNameFromIndex(const Method* method, uint32_t ref, |
| verifier::VerifyErrorRefType ref_type, bool access) { |
| CHECK_EQ(static_cast<int>(ref_type), static_cast<int>(verifier::VERIFY_ERROR_REF_METHOD)); |
| |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| const DexFile& dex_file = class_linker->FindDexFile(method->GetDeclaringClass()->GetDexCache()); |
| |
| const DexFile::MethodId& id = dex_file.GetMethodId(ref); |
| std::string class_name(PrettyDescriptor(dex_file.GetMethodDeclaringClassDescriptor(id))); |
| const char* method_name = dex_file.StringDataByIdx(id.name_idx_); |
| if (!access) { |
| return class_name + "." + method_name; |
| } |
| |
| std::string result; |
| result += "tried to access method "; |
| result += class_name + "." + method_name + ":" + |
| dex_file.CreateMethodSignature(id.proto_idx_, NULL); |
| result += " from class "; |
| result += PrettyDescriptor(method->GetDeclaringClass()); |
| return result; |
| } |
| |
| // Helper function to allocate array for FILLED_NEW_ARRAY. |
| Array* CheckAndAllocArrayFromCode(uint32_t type_idx, Method* method, int32_t component_count, |
| Thread* self, bool access_check) { |
| if (UNLIKELY(component_count < 0)) { |
| self->ThrowNewExceptionF("Ljava/lang/NegativeArraySizeException;", "%d", component_count); |
| return NULL; // Failure |
| } |
| Class* klass = method->GetDexCacheResolvedTypes()->Get(type_idx); |
| if (UNLIKELY(klass == NULL)) { // Not in dex cache so try to resolve |
| klass = Runtime::Current()->GetClassLinker()->ResolveType(type_idx, method); |
| if (klass == NULL) { // Error |
| DCHECK(Thread::Current()->IsExceptionPending()); |
| return NULL; // Failure |
| } |
| } |
| if (UNLIKELY(klass->IsPrimitive() && !klass->IsPrimitiveInt())) { |
| if (klass->IsPrimitiveLong() || klass->IsPrimitiveDouble()) { |
| Thread::Current()->ThrowNewExceptionF("Ljava/lang/RuntimeException;", |
| "Bad filled array request for type %s", |
| PrettyDescriptor(klass).c_str()); |
| } else { |
| Thread::Current()->ThrowNewExceptionF("Ljava/lang/InternalError;", |
| "Found type %s; filled-new-array not implemented for anything but \'int\'", |
| PrettyDescriptor(klass).c_str()); |
| } |
| return NULL; // Failure |
| } else { |
| if (access_check) { |
| Class* referrer = method->GetDeclaringClass(); |
| if (UNLIKELY(!referrer->CanAccess(klass))) { |
| ThrowNewIllegalAccessErrorClass(self, referrer, klass); |
| return NULL; // Failure |
| } |
| } |
| DCHECK(klass->IsArrayClass()) << PrettyClass(klass); |
| return Array::Alloc(klass, component_count); |
| } |
| } |
| |
| // Slow path field resolution and declaring class initialization |
| Field* FindFieldFromCode(uint32_t field_idx, const Method* referrer, Thread* self, |
| bool is_static, bool is_primitive, bool is_set, size_t expected_size) { |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| Field* resolved_field = class_linker->ResolveField(field_idx, referrer, is_static); |
| if (UNLIKELY(resolved_field == NULL)) { |
| DCHECK(self->IsExceptionPending()); // Throw exception and unwind |
| return NULL; // failure |
| } else { |
| Class* fields_class = resolved_field->GetDeclaringClass(); |
| Class* referring_class = referrer->GetDeclaringClass(); |
| if (UNLIKELY(!referring_class->CanAccess(fields_class))) { |
| ThrowNewIllegalAccessErrorClass(self, referring_class, fields_class); |
| return NULL; // failure |
| } else if (UNLIKELY(!referring_class->CanAccessMember(fields_class, |
| resolved_field->GetAccessFlags()))) { |
| ThrowNewIllegalAccessErrorField(self, referring_class, resolved_field); |
| return NULL; // failure |
| } else if (UNLIKELY(is_set && resolved_field->IsFinal() && (fields_class != referring_class))) { |
| ThrowNewIllegalAccessErrorFinalField(self, referrer, resolved_field); |
| return NULL; // failure |
| } else { |
| FieldHelper fh(resolved_field); |
| if (UNLIKELY(fh.IsPrimitiveType() != is_primitive || |
| fh.FieldSize() != expected_size)) { |
| self->ThrowNewExceptionF("Ljava/lang/NoSuchFieldError;", |
| "Attempted read of %zd-bit %s on field '%s'", |
| expected_size * (32 / sizeof(int32_t)), |
| is_primitive ? "primitive" : "non-primitive", |
| PrettyField(resolved_field, true).c_str()); |
| return NULL; // failure |
| } else if (!is_static) { |
| // instance fields must be being accessed on an initialized class |
| return resolved_field; |
| } else { |
| // If the class is already initializing, we must be inside <clinit>, or |
| // we'd still be waiting for the lock. |
| if (fields_class->IsInitializing()) { |
| return resolved_field; |
| } else if (Runtime::Current()->GetClassLinker()->EnsureInitialized(fields_class, true)) { |
| return resolved_field; |
| } else { |
| DCHECK(self->IsExceptionPending()); // Throw exception and unwind |
| return NULL; // failure |
| } |
| } |
| } |
| } |
| } |
| |
| // Slow path method resolution |
| Method* FindMethodFromCode(uint32_t method_idx, Object* this_object, const Method* referrer, |
| Thread* self, bool access_check, InvokeType type) { |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| bool is_direct = type == kStatic || type == kDirect; |
| Method* resolved_method = class_linker->ResolveMethod(method_idx, referrer, is_direct); |
| if (UNLIKELY(resolved_method == NULL)) { |
| DCHECK(self->IsExceptionPending()); // Throw exception and unwind |
| return NULL; // failure |
| } else { |
| if (!access_check) { |
| if (is_direct) { |
| return resolved_method; |
| } else if (type == kInterface) { |
| Method* interface_method = |
| this_object->GetClass()->FindVirtualMethodForInterface(resolved_method); |
| if (UNLIKELY(interface_method == NULL)) { |
| ThrowNewIncompatibleClassChangeErrorClassForInterfaceDispatch(self, referrer, |
| resolved_method, |
| this_object); |
| return NULL; // failure |
| } else { |
| return interface_method; |
| } |
| } else { |
| ObjectArray<Method>* vtable; |
| uint16_t vtable_index = resolved_method->GetMethodIndex(); |
| if (type == kSuper) { |
| vtable = referrer->GetDeclaringClass()->GetSuperClass()->GetVTable(); |
| } else { |
| vtable = this_object->GetClass()->GetVTable(); |
| } |
| // TODO: eliminate bounds check? |
| return vtable->Get(vtable_index); |
| } |
| } else { |
| Class* methods_class = resolved_method->GetDeclaringClass(); |
| Class* referring_class = referrer->GetDeclaringClass(); |
| if (UNLIKELY(!referring_class->CanAccess(methods_class) || |
| !referring_class->CanAccessMember(methods_class, |
| resolved_method->GetAccessFlags()))) { |
| // The referring class can't access the resolved method, this may occur as a result of a |
| // protected method being made public by implementing an interface that re-declares the |
| // method public. Resort to the dex file to determine the correct class for the access check |
| const DexFile& dex_file = class_linker->FindDexFile(referring_class->GetDexCache()); |
| methods_class = class_linker->ResolveType(dex_file, |
| dex_file.GetMethodId(method_idx).class_idx_, |
| referring_class); |
| if (UNLIKELY(!referring_class->CanAccess(methods_class))) { |
| ThrowNewIllegalAccessErrorClassForMethodDispatch(self, referring_class, methods_class, |
| referrer, resolved_method, type); |
| return NULL; // failure |
| } else if (UNLIKELY(!referring_class->CanAccessMember(methods_class, |
| resolved_method->GetAccessFlags()))) { |
| ThrowNewIllegalAccessErrorMethod(self, referring_class, resolved_method); |
| return NULL; // failure |
| } |
| } |
| if (is_direct) { |
| return resolved_method; |
| } else if (type == kInterface) { |
| Method* interface_method = |
| this_object->GetClass()->FindVirtualMethodForInterface(resolved_method); |
| if (UNLIKELY(interface_method == NULL)) { |
| ThrowNewIncompatibleClassChangeErrorClassForInterfaceDispatch(self, referrer, |
| resolved_method, |
| this_object); |
| return NULL; // failure |
| } else { |
| return interface_method; |
| } |
| } else { |
| ObjectArray<Method>* vtable; |
| uint16_t vtable_index = resolved_method->GetMethodIndex(); |
| if (type == kSuper) { |
| Class* super_class = referring_class->GetSuperClass(); |
| if (LIKELY(super_class != NULL)) { |
| vtable = referring_class->GetSuperClass()->GetVTable(); |
| } else { |
| vtable = NULL; |
| } |
| } else { |
| vtable = this_object->GetClass()->GetVTable(); |
| } |
| if (LIKELY(vtable != NULL && |
| vtable_index < static_cast<uint32_t>(vtable->GetLength()))) { |
| return vtable->GetWithoutChecks(vtable_index); |
| } else { |
| // Behavior to agree with that of the verifier |
| self->ThrowNewExceptionF("Ljava/lang/NoSuchMethodError;", |
| "attempt to invoke %s method '%s' from '%s'" |
| " using incorrect form of method dispatch", |
| (type == kSuper ? "super class" : "virtual"), |
| PrettyMethod(resolved_method).c_str(), |
| PrettyMethod(referrer).c_str()); |
| return NULL; // failure |
| } |
| } |
| } |
| } |
| } |
| |
| Class* ResolveVerifyAndClinit(uint32_t type_idx, const Method* referrer, Thread* self, |
| bool can_run_clinit, bool verify_access) { |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| Class* klass = class_linker->ResolveType(type_idx, referrer); |
| if (UNLIKELY(klass == NULL)) { |
| CHECK(self->IsExceptionPending()); |
| return NULL; // Failure - Indicate to caller to deliver exception |
| } |
| // Perform access check if necessary. |
| Class* referring_class = referrer->GetDeclaringClass(); |
| if (verify_access && UNLIKELY(!referring_class->CanAccess(klass))) { |
| ThrowNewIllegalAccessErrorClass(self, referring_class, klass); |
| return NULL; // Failure - Indicate to caller to deliver exception |
| } |
| // If we're just implementing const-class, we shouldn't call <clinit>. |
| if (!can_run_clinit) { |
| return klass; |
| } |
| // If we are the <clinit> of this class, just return our storage. |
| // |
| // Do not set the DexCache InitializedStaticStorage, since that implies <clinit> has finished |
| // running. |
| if (klass == referring_class && MethodHelper(referrer).IsClassInitializer()) { |
| return klass; |
| } |
| if (!class_linker->EnsureInitialized(klass, true)) { |
| CHECK(self->IsExceptionPending()); |
| return NULL; // Failure - Indicate to caller to deliver exception |
| } |
| referrer->GetDexCacheInitializedStaticStorage()->Set(type_idx, klass); |
| return klass; |
| } |
| |
| } // namespace art |
