| // Copyright 2012 Google Inc. All Rights Reserved. |
| |
| #ifndef ART_SRC_RUNTIME_SUPPORT_COMMON_H_ |
| #define ART_SRC_RUNTIME_SUPPORT_COMMON_H_ |
| |
| #include "class_linker.h" |
| #include "constants.h" |
| #include "object.h" |
| #include "object_utils.h" |
| #include "thread.h" |
| |
| #include <stdint.h> |
| |
| namespace art { |
| |
| class Array; |
| class Class; |
| class Field; |
| class Method; |
| class Object; |
| |
| static inline 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()); |
| } |
| |
| static inline 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()); |
| } |
| |
| static inline 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()); |
| } |
| |
| static inline 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()); |
| } |
| |
| static inline 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()); |
| } |
| |
| static inline 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()); |
| } |
| |
| static inline 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()); |
| } |
| |
| static inline 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()); |
| } |
| |
| // Given the context of a calling Method, use its DexCache to resolve a type to a Class. If it |
| // cannot be resolved, throw an error. If it can, use it to create an instance. |
| // When verification/compiler hasn't been able to verify access, optionally perform an access |
| // check. |
| static inline Object* AllocObjectFromCode(uint32_t type_idx, Method* method, Thread* self, |
| bool access_check) { |
| Class* klass = method->GetDexCacheResolvedTypes()->Get(type_idx); |
| Runtime* runtime = Runtime::Current(); |
| if (UNLIKELY(klass == NULL)) { |
| klass = runtime->GetClassLinker()->ResolveType(type_idx, method); |
| if (klass == NULL) { |
| DCHECK(self->IsExceptionPending()); |
| return NULL; // Failure |
| } |
| } |
| if (access_check) { |
| if (UNLIKELY(!klass->IsInstantiable())) { |
| self->ThrowNewException("Ljava/lang/InstantiationError;", |
| PrettyDescriptor(klass).c_str()); |
| return NULL; // Failure |
| } |
| Class* referrer = method->GetDeclaringClass(); |
| if (UNLIKELY(!referrer->CanAccess(klass))) { |
| ThrowNewIllegalAccessErrorClass(self, referrer, klass); |
| return NULL; // Failure |
| } |
| } |
| if (!runtime->GetClassLinker()->EnsureInitialized(klass, true)) { |
| DCHECK(self->IsExceptionPending()); |
| return NULL; // Failure |
| } |
| return klass->AllocObject(); |
| } |
| |
| // Given the context of a calling Method, use its DexCache to resolve a type to an array Class. If |
| // it cannot be resolved, throw an error. If it can, use it to create an array. |
| // When verification/compiler hasn't been able to verify access, optionally perform an access |
| // check. |
| static inline Array* AllocArrayFromCode(uint32_t type_idx, Method* method, int32_t component_count, |
| Thread* self, bool access_check) { |
| if (UNLIKELY(component_count < 0)) { |
| Thread::Current()->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 |
| } |
| CHECK(klass->IsArrayClass()) << PrettyClass(klass); |
| } |
| if (access_check) { |
| Class* referrer = method->GetDeclaringClass(); |
| if (UNLIKELY(!referrer->CanAccess(klass))) { |
| ThrowNewIllegalAccessErrorClass(self, referrer, klass); |
| return NULL; // Failure |
| } |
| } |
| return Array::Alloc(klass, component_count); |
| } |
| |
| extern Array* CheckAndAllocArrayFromCode(uint32_t type_idx, Method* method, int32_t component_count, |
| Thread* self, bool access_check); |
| |
| extern Field* FindFieldFromCode(uint32_t field_idx, const Method* referrer, Thread* self, |
| bool is_static, bool is_primitive, bool is_set, |
| size_t expected_size); |
| |
| // Fast path field resolution that can't throw exceptions |
| static inline Field* FindFieldFast(uint32_t field_idx, const Method* referrer, bool is_primitive, |
| size_t expected_size, bool is_set) { |
| Field* resolved_field = referrer->GetDeclaringClass()->GetDexCache()->GetResolvedField(field_idx); |
| if (UNLIKELY(resolved_field == NULL)) { |
| return NULL; |
| } |
| Class* fields_class = resolved_field->GetDeclaringClass(); |
| // Check class is initiliazed or initializing |
| if (UNLIKELY(!fields_class->IsInitializing())) { |
| return NULL; |
| } |
| Class* referring_class = referrer->GetDeclaringClass(); |
| if (UNLIKELY(!referring_class->CanAccess(fields_class) || |
| !referring_class->CanAccessMember(fields_class, |
| resolved_field->GetAccessFlags()) || |
| (is_set && resolved_field->IsFinal() && (fields_class != referring_class)))) { |
| // illegal access |
| return NULL; |
| } |
| FieldHelper fh(resolved_field); |
| if (UNLIKELY(fh.IsPrimitiveType() != is_primitive || |
| fh.FieldSize() != expected_size)) { |
| return NULL; |
| } |
| return resolved_field; |
| } |
| |
| // Fast path method resolution that can't throw exceptions |
| static inline Method* FindMethodFast(uint32_t method_idx, Object* this_object, const Method* referrer, |
| bool access_check, InvokeType type) { |
| bool is_direct = type == kStatic || type == kDirect; |
| if (UNLIKELY(this_object == NULL && !is_direct)) { |
| return NULL; |
| } |
| Method* resolved_method = |
| referrer->GetDeclaringClass()->GetDexCache()->GetResolvedMethod(method_idx); |
| if (UNLIKELY(resolved_method == NULL)) { |
| return NULL; |
| } |
| if (access_check) { |
| 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()))) { |
| // potential illegal access |
| return NULL; |
| } |
| } |
| if (type == kInterface) { // Most common form of slow path dispatch. |
| return this_object->GetClass()->FindVirtualMethodForInterface(resolved_method); |
| } else if (is_direct) { |
| return resolved_method; |
| } else if (type == kSuper) { |
| return referrer->GetDeclaringClass()->GetSuperClass()->GetVTable()-> |
| Get(resolved_method->GetMethodIndex()); |
| } else { |
| DCHECK(type == kVirtual); |
| return this_object->GetClass()->GetVTable()->Get(resolved_method->GetMethodIndex()); |
| } |
| } |
| |
| extern Method* FindMethodFromCode(uint32_t method_idx, Object* this_object, const Method* referrer, |
| Thread* self, bool access_check, InvokeType type); |
| |
| extern Class* ResolveVerifyAndClinit(uint32_t type_idx, const Method* referrer, Thread* self, |
| bool can_run_clinit, bool verify_access); |
| |
| static inline String* ResolveStringFromCode(const Method* referrer, uint32_t string_idx) { |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| return class_linker->ResolveString(string_idx, referrer); |
| } |
| |
| } // namespace art |
| |
| #endif // ART_SRC_RUNTIME_SUPPORT_COMMON_H_ |