| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * |
| * 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 "java_lang_Class.h" |
| |
| #include <iostream> |
| |
| #include "art_field-inl.h" |
| #include "art_method-inl.h" |
| #include "base/enums.h" |
| #include "class_linker-inl.h" |
| #include "common_throws.h" |
| #include "dex/descriptors_names.h" |
| #include "dex/dex_file-inl.h" |
| #include "dex/dex_file_annotations.h" |
| #include "dex/utf.h" |
| #include "hidden_api.h" |
| #include "jni_internal.h" |
| #include "mirror/class-inl.h" |
| #include "mirror/class_loader.h" |
| #include "mirror/field-inl.h" |
| #include "mirror/method.h" |
| #include "mirror/method_handles_lookup.h" |
| #include "mirror/object-inl.h" |
| #include "mirror/object_array-inl.h" |
| #include "mirror/string-inl.h" |
| #include "native_util.h" |
| #include "nativehelper/jni_macros.h" |
| #include "nativehelper/scoped_local_ref.h" |
| #include "nativehelper/scoped_utf_chars.h" |
| #include "nth_caller_visitor.h" |
| #include "obj_ptr-inl.h" |
| #include "reflection.h" |
| #include "scoped_fast_native_object_access-inl.h" |
| #include "scoped_thread_state_change-inl.h" |
| #include "well_known_classes.h" |
| |
| namespace art { |
| |
| // Returns true if the first caller outside of the Class class or java.lang.invoke package |
| // is in a platform DEX file. |
| static bool IsCallerTrusted(Thread* self) REQUIRES_SHARED(Locks::mutator_lock_) { |
| // Walk the stack and find the first frame not from java.lang.Class and not from java.lang.invoke. |
| // This is very expensive. Save this till the last. |
| struct FirstExternalCallerVisitor : public StackVisitor { |
| explicit FirstExternalCallerVisitor(Thread* thread) |
| : StackVisitor(thread, nullptr, StackVisitor::StackWalkKind::kIncludeInlinedFrames), |
| caller(nullptr) { |
| } |
| |
| bool VisitFrame() REQUIRES_SHARED(Locks::mutator_lock_) { |
| ArtMethod *m = GetMethod(); |
| if (m == nullptr) { |
| // Attached native thread. Assume this is *not* boot class path. |
| caller = nullptr; |
| return false; |
| } else if (m->IsRuntimeMethod()) { |
| // Internal runtime method, continue walking the stack. |
| return true; |
| } |
| |
| ObjPtr<mirror::Class> declaring_class = m->GetDeclaringClass(); |
| if (declaring_class->IsBootStrapClassLoaded()) { |
| if (declaring_class->IsClassClass()) { |
| return true; |
| } |
| // Check classes in the java.lang.invoke package. At the time of writing, the |
| // classes of interest are MethodHandles and MethodHandles.Lookup, but this |
| // is subject to change so conservatively cover the entire package. |
| // NB Static initializers within java.lang.invoke are permitted and do not |
| // need further stack inspection. |
| ObjPtr<mirror::Class> lookup_class = mirror::MethodHandlesLookup::StaticClass(); |
| if ((declaring_class == lookup_class || declaring_class->IsInSamePackage(lookup_class)) |
| && !m->IsClassInitializer()) { |
| return true; |
| } |
| } |
| |
| caller = m; |
| return false; |
| } |
| |
| ArtMethod* caller; |
| }; |
| |
| FirstExternalCallerVisitor visitor(self); |
| visitor.WalkStack(); |
| return visitor.caller != nullptr && |
| hiddenapi::IsCallerTrusted(visitor.caller->GetDeclaringClass()); |
| } |
| |
| // Returns true if the first non-ClassClass caller up the stack is not allowed to |
| // access hidden APIs. This can be *very* expensive. Never call this in a loop. |
| ALWAYS_INLINE static bool ShouldEnforceHiddenApi(Thread* self) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| hiddenapi::EnforcementPolicy policy = Runtime::Current()->GetHiddenApiEnforcementPolicy(); |
| return policy != hiddenapi::EnforcementPolicy::kNoChecks && !IsCallerTrusted(self); |
| } |
| |
| // Returns true if the first non-ClassClass caller up the stack should not be |
| // allowed access to `member`. |
| template<typename T> |
| ALWAYS_INLINE static bool ShouldBlockAccessToMember(T* member, Thread* self) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| hiddenapi::Action action = hiddenapi::GetMemberAction( |
| member, self, IsCallerTrusted, hiddenapi::kReflection); |
| if (action != hiddenapi::kAllow) { |
| hiddenapi::NotifyHiddenApiListener(member); |
| } |
| |
| return action == hiddenapi::kDeny; |
| } |
| |
| // Returns true if a class member should be discoverable with reflection given |
| // the criteria. Some reflection calls only return public members |
| // (public_only == true), some members should be hidden from non-boot class path |
| // callers (enforce_hidden_api == true). |
| template<typename T> |
| ALWAYS_INLINE static bool IsDiscoverable(bool public_only, |
| bool enforce_hidden_api, |
| T* member) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| if (public_only && ((member->GetAccessFlags() & kAccPublic) == 0)) { |
| return false; |
| } |
| |
| return hiddenapi::GetMemberAction(member, |
| nullptr, |
| [enforce_hidden_api] (Thread*) { return !enforce_hidden_api; }, |
| hiddenapi::kNone) |
| != hiddenapi::kDeny; |
| } |
| |
| ALWAYS_INLINE static inline ObjPtr<mirror::Class> DecodeClass( |
| const ScopedFastNativeObjectAccess& soa, jobject java_class) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| ObjPtr<mirror::Class> c = soa.Decode<mirror::Class>(java_class); |
| DCHECK(c != nullptr); |
| DCHECK(c->IsClass()); |
| // TODO: we could EnsureInitialized here, rather than on every reflective get/set or invoke . |
| // For now, we conservatively preserve the old dalvik behavior. A quick "IsInitialized" check |
| // every time probably doesn't make much difference to reflection performance anyway. |
| return c; |
| } |
| |
| // "name" is in "binary name" format, e.g. "dalvik.system.Debug$1". |
| static jclass Class_classForName(JNIEnv* env, jclass, jstring javaName, jboolean initialize, |
| jobject javaLoader) { |
| ScopedFastNativeObjectAccess soa(env); |
| ScopedUtfChars name(env, javaName); |
| if (name.c_str() == nullptr) { |
| return nullptr; |
| } |
| |
| // We need to validate and convert the name (from x.y.z to x/y/z). This |
| // is especially handy for array types, since we want to avoid |
| // auto-generating bogus array classes. |
| if (!IsValidBinaryClassName(name.c_str())) { |
| soa.Self()->ThrowNewExceptionF("Ljava/lang/ClassNotFoundException;", |
| "Invalid name: %s", name.c_str()); |
| return nullptr; |
| } |
| |
| std::string descriptor(DotToDescriptor(name.c_str())); |
| StackHandleScope<2> hs(soa.Self()); |
| Handle<mirror::ClassLoader> class_loader( |
| hs.NewHandle(soa.Decode<mirror::ClassLoader>(javaLoader))); |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| Handle<mirror::Class> c( |
| hs.NewHandle(class_linker->FindClass(soa.Self(), descriptor.c_str(), class_loader))); |
| if (c == nullptr) { |
| ScopedLocalRef<jthrowable> cause(env, env->ExceptionOccurred()); |
| env->ExceptionClear(); |
| jthrowable cnfe = reinterpret_cast<jthrowable>( |
| env->NewObject(WellKnownClasses::java_lang_ClassNotFoundException, |
| WellKnownClasses::java_lang_ClassNotFoundException_init, |
| javaName, |
| cause.get())); |
| if (cnfe != nullptr) { |
| // Make sure allocation didn't fail with an OOME. |
| env->Throw(cnfe); |
| } |
| return nullptr; |
| } |
| if (initialize) { |
| class_linker->EnsureInitialized(soa.Self(), c, true, true); |
| } |
| return soa.AddLocalReference<jclass>(c.Get()); |
| } |
| |
| static jclass Class_getPrimitiveClass(JNIEnv* env, jclass, jstring name) { |
| ScopedFastNativeObjectAccess soa(env); |
| ObjPtr<mirror::Class> klass = mirror::Class::GetPrimitiveClass(soa.Decode<mirror::String>(name)); |
| return soa.AddLocalReference<jclass>(klass); |
| } |
| |
| static jstring Class_getNameNative(JNIEnv* env, jobject javaThis) { |
| ScopedFastNativeObjectAccess soa(env); |
| StackHandleScope<1> hs(soa.Self()); |
| ObjPtr<mirror::Class> c = DecodeClass(soa, javaThis); |
| return soa.AddLocalReference<jstring>(mirror::Class::ComputeName(hs.NewHandle(c))); |
| } |
| |
| // TODO: Move this to mirror::Class ? Other mirror types that commonly appear |
| // as arrays have a GetArrayClass() method. |
| static ObjPtr<mirror::Class> GetClassArrayClass(Thread* self) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| ObjPtr<mirror::Class> class_class = mirror::Class::GetJavaLangClass(); |
| return Runtime::Current()->GetClassLinker()->FindArrayClass(self, &class_class); |
| } |
| |
| static jobjectArray Class_getInterfacesInternal(JNIEnv* env, jobject javaThis) { |
| ScopedFastNativeObjectAccess soa(env); |
| StackHandleScope<4> hs(soa.Self()); |
| Handle<mirror::Class> klass = hs.NewHandle(DecodeClass(soa, javaThis)); |
| |
| if (klass->IsProxyClass()) { |
| return soa.AddLocalReference<jobjectArray>(klass->GetProxyInterfaces()->Clone(soa.Self())); |
| } |
| |
| const DexFile::TypeList* iface_list = klass->GetInterfaceTypeList(); |
| if (iface_list == nullptr) { |
| return nullptr; |
| } |
| |
| const uint32_t num_ifaces = iface_list->Size(); |
| Handle<mirror::Class> class_array_class = hs.NewHandle(GetClassArrayClass(soa.Self())); |
| Handle<mirror::ObjectArray<mirror::Class>> ifaces = hs.NewHandle( |
| mirror::ObjectArray<mirror::Class>::Alloc(soa.Self(), class_array_class.Get(), num_ifaces)); |
| if (ifaces.IsNull()) { |
| DCHECK(soa.Self()->IsExceptionPending()); |
| return nullptr; |
| } |
| |
| // Check that we aren't in an active transaction, we call SetWithoutChecks |
| // with kActiveTransaction == false. |
| DCHECK(!Runtime::Current()->IsActiveTransaction()); |
| |
| ClassLinker* linker = Runtime::Current()->GetClassLinker(); |
| MutableHandle<mirror::Class> interface(hs.NewHandle<mirror::Class>(nullptr)); |
| for (uint32_t i = 0; i < num_ifaces; ++i) { |
| const dex::TypeIndex type_idx = iface_list->GetTypeItem(i).type_idx_; |
| interface.Assign(linker->LookupResolvedType(type_idx, klass.Get())); |
| ifaces->SetWithoutChecks<false>(i, interface.Get()); |
| } |
| |
| return soa.AddLocalReference<jobjectArray>(ifaces.Get()); |
| } |
| |
| static mirror::ObjectArray<mirror::Field>* GetDeclaredFields( |
| Thread* self, ObjPtr<mirror::Class> klass, bool public_only, bool force_resolve) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| StackHandleScope<1> hs(self); |
| IterationRange<StrideIterator<ArtField>> ifields = klass->GetIFields(); |
| IterationRange<StrideIterator<ArtField>> sfields = klass->GetSFields(); |
| size_t array_size = klass->NumInstanceFields() + klass->NumStaticFields(); |
| bool enforce_hidden_api = ShouldEnforceHiddenApi(self); |
| // Lets go subtract all the non discoverable fields. |
| for (ArtField& field : ifields) { |
| if (!IsDiscoverable(public_only, enforce_hidden_api, &field)) { |
| --array_size; |
| } |
| } |
| for (ArtField& field : sfields) { |
| if (!IsDiscoverable(public_only, enforce_hidden_api, &field)) { |
| --array_size; |
| } |
| } |
| size_t array_idx = 0; |
| auto object_array = hs.NewHandle(mirror::ObjectArray<mirror::Field>::Alloc( |
| self, mirror::Field::ArrayClass(), array_size)); |
| if (object_array == nullptr) { |
| return nullptr; |
| } |
| for (ArtField& field : ifields) { |
| if (IsDiscoverable(public_only, enforce_hidden_api, &field)) { |
| auto* reflect_field = mirror::Field::CreateFromArtField<kRuntimePointerSize>(self, |
| &field, |
| force_resolve); |
| if (reflect_field == nullptr) { |
| if (kIsDebugBuild) { |
| self->AssertPendingException(); |
| } |
| // Maybe null due to OOME or type resolving exception. |
| return nullptr; |
| } |
| object_array->SetWithoutChecks<false>(array_idx++, reflect_field); |
| } |
| } |
| for (ArtField& field : sfields) { |
| if (IsDiscoverable(public_only, enforce_hidden_api, &field)) { |
| auto* reflect_field = mirror::Field::CreateFromArtField<kRuntimePointerSize>(self, |
| &field, |
| force_resolve); |
| if (reflect_field == nullptr) { |
| if (kIsDebugBuild) { |
| self->AssertPendingException(); |
| } |
| return nullptr; |
| } |
| object_array->SetWithoutChecks<false>(array_idx++, reflect_field); |
| } |
| } |
| DCHECK_EQ(array_idx, array_size); |
| return object_array.Get(); |
| } |
| |
| static jobjectArray Class_getDeclaredFieldsUnchecked(JNIEnv* env, jobject javaThis, |
| jboolean publicOnly) { |
| ScopedFastNativeObjectAccess soa(env); |
| return soa.AddLocalReference<jobjectArray>( |
| GetDeclaredFields(soa.Self(), DecodeClass(soa, javaThis), publicOnly != JNI_FALSE, false)); |
| } |
| |
| static jobjectArray Class_getDeclaredFields(JNIEnv* env, jobject javaThis) { |
| ScopedFastNativeObjectAccess soa(env); |
| return soa.AddLocalReference<jobjectArray>( |
| GetDeclaredFields(soa.Self(), DecodeClass(soa, javaThis), false, true)); |
| } |
| |
| static jobjectArray Class_getPublicDeclaredFields(JNIEnv* env, jobject javaThis) { |
| ScopedFastNativeObjectAccess soa(env); |
| return soa.AddLocalReference<jobjectArray>( |
| GetDeclaredFields(soa.Self(), DecodeClass(soa, javaThis), true, true)); |
| } |
| |
| // Performs a binary search through an array of fields, TODO: Is this fast enough if we don't use |
| // the dex cache for lookups? I think CompareModifiedUtf8ToUtf16AsCodePointValues should be fairly |
| // fast. |
| ALWAYS_INLINE static inline ArtField* FindFieldByName(ObjPtr<mirror::String> name, |
| LengthPrefixedArray<ArtField>* fields) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| if (fields == nullptr) { |
| return nullptr; |
| } |
| size_t low = 0; |
| size_t high = fields->size(); |
| const bool is_name_compressed = name->IsCompressed(); |
| const uint16_t* const data = (is_name_compressed) ? nullptr : name->GetValue(); |
| const uint8_t* const data_compressed = (is_name_compressed) ? name->GetValueCompressed() |
| : nullptr; |
| const size_t length = name->GetLength(); |
| while (low < high) { |
| auto mid = (low + high) / 2; |
| ArtField& field = fields->At(mid); |
| int result = 0; |
| if (is_name_compressed) { |
| size_t field_length = strlen(field.GetName()); |
| size_t min_size = (length < field_length) ? length : field_length; |
| result = memcmp(field.GetName(), data_compressed, min_size); |
| if (result == 0) { |
| result = field_length - length; |
| } |
| } else { |
| result = CompareModifiedUtf8ToUtf16AsCodePointValues(field.GetName(), data, length); |
| } |
| // Alternate approach, only a few % faster at the cost of more allocations. |
| // int result = field->GetStringName(self, true)->CompareTo(name); |
| if (result < 0) { |
| low = mid + 1; |
| } else if (result > 0) { |
| high = mid; |
| } else { |
| return &field; |
| } |
| } |
| if (kIsDebugBuild) { |
| for (ArtField& field : MakeIterationRangeFromLengthPrefixedArray(fields)) { |
| CHECK_NE(field.GetName(), name->ToModifiedUtf8()); |
| } |
| } |
| return nullptr; |
| } |
| |
| ALWAYS_INLINE static inline mirror::Field* GetDeclaredField(Thread* self, |
| ObjPtr<mirror::Class> c, |
| ObjPtr<mirror::String> name) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| ArtField* art_field = FindFieldByName(name, c->GetIFieldsPtr()); |
| if (art_field != nullptr) { |
| return mirror::Field::CreateFromArtField<kRuntimePointerSize>(self, art_field, true); |
| } |
| art_field = FindFieldByName(name, c->GetSFieldsPtr()); |
| if (art_field != nullptr) { |
| return mirror::Field::CreateFromArtField<kRuntimePointerSize>(self, art_field, true); |
| } |
| return nullptr; |
| } |
| |
| static mirror::Field* GetPublicFieldRecursive( |
| Thread* self, ObjPtr<mirror::Class> clazz, ObjPtr<mirror::String> name) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| DCHECK(clazz != nullptr); |
| DCHECK(name != nullptr); |
| DCHECK(self != nullptr); |
| |
| StackHandleScope<2> hs(self); |
| MutableHandle<mirror::Class> h_clazz(hs.NewHandle(clazz)); |
| Handle<mirror::String> h_name(hs.NewHandle(name)); |
| |
| // We search the current class, its direct interfaces then its superclass. |
| while (h_clazz != nullptr) { |
| mirror::Field* result = GetDeclaredField(self, h_clazz.Get(), h_name.Get()); |
| if ((result != nullptr) && (result->GetAccessFlags() & kAccPublic)) { |
| return result; |
| } else if (UNLIKELY(self->IsExceptionPending())) { |
| // Something went wrong. Bail out. |
| return nullptr; |
| } |
| |
| uint32_t num_direct_interfaces = h_clazz->NumDirectInterfaces(); |
| for (uint32_t i = 0; i < num_direct_interfaces; i++) { |
| ObjPtr<mirror::Class> iface = mirror::Class::ResolveDirectInterface(self, h_clazz, i); |
| if (UNLIKELY(iface == nullptr)) { |
| self->AssertPendingException(); |
| return nullptr; |
| } |
| result = GetPublicFieldRecursive(self, iface, h_name.Get()); |
| if (result != nullptr) { |
| DCHECK(result->GetAccessFlags() & kAccPublic); |
| return result; |
| } else if (UNLIKELY(self->IsExceptionPending())) { |
| // Something went wrong. Bail out. |
| return nullptr; |
| } |
| } |
| |
| // We don't try the superclass if we are an interface. |
| if (h_clazz->IsInterface()) { |
| break; |
| } |
| |
| // Get the next class. |
| h_clazz.Assign(h_clazz->GetSuperClass()); |
| } |
| return nullptr; |
| } |
| |
| static jobject Class_getPublicFieldRecursive(JNIEnv* env, jobject javaThis, jstring name) { |
| ScopedFastNativeObjectAccess soa(env); |
| auto name_string = soa.Decode<mirror::String>(name); |
| if (UNLIKELY(name_string == nullptr)) { |
| ThrowNullPointerException("name == null"); |
| return nullptr; |
| } |
| |
| StackHandleScope<1> hs(soa.Self()); |
| Handle<mirror::Field> field = hs.NewHandle(GetPublicFieldRecursive( |
| soa.Self(), DecodeClass(soa, javaThis), name_string)); |
| if (field.Get() == nullptr || |
| ShouldBlockAccessToMember(field->GetArtField(), soa.Self())) { |
| return nullptr; |
| } |
| return soa.AddLocalReference<jobject>(field.Get()); |
| } |
| |
| static jobject Class_getDeclaredField(JNIEnv* env, jobject javaThis, jstring name) { |
| ScopedFastNativeObjectAccess soa(env); |
| StackHandleScope<3> hs(soa.Self()); |
| Handle<mirror::String> h_string = hs.NewHandle(soa.Decode<mirror::String>(name)); |
| if (h_string == nullptr) { |
| ThrowNullPointerException("name == null"); |
| return nullptr; |
| } |
| Handle<mirror::Class> h_klass = hs.NewHandle(DecodeClass(soa, javaThis)); |
| Handle<mirror::Field> result = |
| hs.NewHandle(GetDeclaredField(soa.Self(), h_klass.Get(), h_string.Get())); |
| if (result == nullptr || ShouldBlockAccessToMember(result->GetArtField(), soa.Self())) { |
| std::string name_str = h_string->ToModifiedUtf8(); |
| if (name_str == "value" && h_klass->IsStringClass()) { |
| // We log the error for this specific case, as the user might just swallow the exception. |
| // This helps diagnose crashes when applications rely on the String#value field being |
| // there. |
| // Also print on the error stream to test it through run-test. |
| std::string message("The String#value field is not present on Android versions >= 6.0"); |
| LOG(ERROR) << message; |
| std::cerr << message << std::endl; |
| } |
| // We may have a pending exception if we failed to resolve. |
| if (!soa.Self()->IsExceptionPending()) { |
| ThrowNoSuchFieldException(h_klass.Get(), name_str.c_str()); |
| } |
| return nullptr; |
| } |
| return soa.AddLocalReference<jobject>(result.Get()); |
| } |
| |
| static jobject Class_getDeclaredConstructorInternal( |
| JNIEnv* env, jobject javaThis, jobjectArray args) { |
| ScopedFastNativeObjectAccess soa(env); |
| DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize); |
| DCHECK(!Runtime::Current()->IsActiveTransaction()); |
| |
| StackHandleScope<1> hs(soa.Self()); |
| Handle<mirror::Constructor> result = hs.NewHandle( |
| mirror::Class::GetDeclaredConstructorInternal<kRuntimePointerSize, false>( |
| soa.Self(), |
| DecodeClass(soa, javaThis), |
| soa.Decode<mirror::ObjectArray<mirror::Class>>(args))); |
| if (result == nullptr || ShouldBlockAccessToMember(result->GetArtMethod(), soa.Self())) { |
| return nullptr; |
| } |
| return soa.AddLocalReference<jobject>(result.Get()); |
| } |
| |
| static ALWAYS_INLINE inline bool MethodMatchesConstructor( |
| ArtMethod* m, bool public_only, bool enforce_hidden_api) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| DCHECK(m != nullptr); |
| return m->IsConstructor() && |
| !m->IsStatic() && |
| IsDiscoverable(public_only, enforce_hidden_api, m); |
| } |
| |
| static jobjectArray Class_getDeclaredConstructorsInternal( |
| JNIEnv* env, jobject javaThis, jboolean publicOnly) { |
| ScopedFastNativeObjectAccess soa(env); |
| StackHandleScope<2> hs(soa.Self()); |
| bool public_only = (publicOnly != JNI_FALSE); |
| bool enforce_hidden_api = ShouldEnforceHiddenApi(soa.Self()); |
| Handle<mirror::Class> h_klass = hs.NewHandle(DecodeClass(soa, javaThis)); |
| size_t constructor_count = 0; |
| // Two pass approach for speed. |
| for (auto& m : h_klass->GetDirectMethods(kRuntimePointerSize)) { |
| constructor_count += MethodMatchesConstructor(&m, public_only, enforce_hidden_api) ? 1u : 0u; |
| } |
| auto h_constructors = hs.NewHandle(mirror::ObjectArray<mirror::Constructor>::Alloc( |
| soa.Self(), mirror::Constructor::ArrayClass(), constructor_count)); |
| if (UNLIKELY(h_constructors == nullptr)) { |
| soa.Self()->AssertPendingException(); |
| return nullptr; |
| } |
| constructor_count = 0; |
| for (auto& m : h_klass->GetDirectMethods(kRuntimePointerSize)) { |
| if (MethodMatchesConstructor(&m, public_only, enforce_hidden_api)) { |
| DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize); |
| DCHECK(!Runtime::Current()->IsActiveTransaction()); |
| auto* constructor = mirror::Constructor::CreateFromArtMethod<kRuntimePointerSize, false>( |
| soa.Self(), &m); |
| if (UNLIKELY(constructor == nullptr)) { |
| soa.Self()->AssertPendingOOMException(); |
| return nullptr; |
| } |
| h_constructors->SetWithoutChecks<false>(constructor_count++, constructor); |
| } |
| } |
| return soa.AddLocalReference<jobjectArray>(h_constructors.Get()); |
| } |
| |
| static jobject Class_getDeclaredMethodInternal(JNIEnv* env, jobject javaThis, |
| jstring name, jobjectArray args) { |
| ScopedFastNativeObjectAccess soa(env); |
| StackHandleScope<1> hs(soa.Self()); |
| DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize); |
| DCHECK(!Runtime::Current()->IsActiveTransaction()); |
| Handle<mirror::Method> result = hs.NewHandle( |
| mirror::Class::GetDeclaredMethodInternal<kRuntimePointerSize, false>( |
| soa.Self(), |
| DecodeClass(soa, javaThis), |
| soa.Decode<mirror::String>(name), |
| soa.Decode<mirror::ObjectArray<mirror::Class>>(args))); |
| if (result == nullptr || ShouldBlockAccessToMember(result->GetArtMethod(), soa.Self())) { |
| return nullptr; |
| } |
| return soa.AddLocalReference<jobject>(result.Get()); |
| } |
| |
| static jobjectArray Class_getDeclaredMethodsUnchecked(JNIEnv* env, jobject javaThis, |
| jboolean publicOnly) { |
| ScopedFastNativeObjectAccess soa(env); |
| StackHandleScope<2> hs(soa.Self()); |
| |
| bool enforce_hidden_api = ShouldEnforceHiddenApi(soa.Self()); |
| bool public_only = (publicOnly != JNI_FALSE); |
| |
| Handle<mirror::Class> klass = hs.NewHandle(DecodeClass(soa, javaThis)); |
| size_t num_methods = 0; |
| for (ArtMethod& m : klass->GetDeclaredMethods(kRuntimePointerSize)) { |
| uint32_t modifiers = m.GetAccessFlags(); |
| // Add non-constructor declared methods. |
| if ((modifiers & kAccConstructor) == 0 && |
| IsDiscoverable(public_only, enforce_hidden_api, &m)) { |
| ++num_methods; |
| } |
| } |
| auto ret = hs.NewHandle(mirror::ObjectArray<mirror::Method>::Alloc( |
| soa.Self(), mirror::Method::ArrayClass(), num_methods)); |
| if (ret == nullptr) { |
| soa.Self()->AssertPendingOOMException(); |
| return nullptr; |
| } |
| num_methods = 0; |
| for (ArtMethod& m : klass->GetDeclaredMethods(kRuntimePointerSize)) { |
| uint32_t modifiers = m.GetAccessFlags(); |
| if ((modifiers & kAccConstructor) == 0 && |
| IsDiscoverable(public_only, enforce_hidden_api, &m)) { |
| DCHECK_EQ(Runtime::Current()->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize); |
| DCHECK(!Runtime::Current()->IsActiveTransaction()); |
| auto* method = |
| mirror::Method::CreateFromArtMethod<kRuntimePointerSize, false>(soa.Self(), &m); |
| if (method == nullptr) { |
| soa.Self()->AssertPendingException(); |
| return nullptr; |
| } |
| ret->SetWithoutChecks<false>(num_methods++, method); |
| } |
| } |
| return soa.AddLocalReference<jobjectArray>(ret.Get()); |
| } |
| |
| static jobject Class_getDeclaredAnnotation(JNIEnv* env, jobject javaThis, jclass annotationClass) { |
| ScopedFastNativeObjectAccess soa(env); |
| StackHandleScope<2> hs(soa.Self()); |
| Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis))); |
| |
| // Handle public contract to throw NPE if the "annotationClass" argument was null. |
| if (UNLIKELY(annotationClass == nullptr)) { |
| ThrowNullPointerException("annotationClass"); |
| return nullptr; |
| } |
| |
| if (klass->IsProxyClass() || klass->GetDexCache() == nullptr) { |
| return nullptr; |
| } |
| Handle<mirror::Class> annotation_class(hs.NewHandle(soa.Decode<mirror::Class>(annotationClass))); |
| return soa.AddLocalReference<jobject>( |
| annotations::GetAnnotationForClass(klass, annotation_class)); |
| } |
| |
| static jobjectArray Class_getDeclaredAnnotations(JNIEnv* env, jobject javaThis) { |
| ScopedFastNativeObjectAccess soa(env); |
| StackHandleScope<1> hs(soa.Self()); |
| Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis))); |
| if (klass->IsProxyClass() || klass->GetDexCache() == nullptr) { |
| // Return an empty array instead of a null pointer. |
| ObjPtr<mirror::Class> annotation_array_class = |
| soa.Decode<mirror::Class>(WellKnownClasses::java_lang_annotation_Annotation__array); |
| mirror::ObjectArray<mirror::Object>* empty_array = |
| mirror::ObjectArray<mirror::Object>::Alloc(soa.Self(), |
| annotation_array_class.Ptr(), |
| 0); |
| return soa.AddLocalReference<jobjectArray>(empty_array); |
| } |
| return soa.AddLocalReference<jobjectArray>(annotations::GetAnnotationsForClass(klass)); |
| } |
| |
| static jobjectArray Class_getDeclaredClasses(JNIEnv* env, jobject javaThis) { |
| ScopedFastNativeObjectAccess soa(env); |
| StackHandleScope<1> hs(soa.Self()); |
| Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis))); |
| mirror::ObjectArray<mirror::Class>* classes = nullptr; |
| if (!klass->IsProxyClass() && klass->GetDexCache() != nullptr) { |
| classes = annotations::GetDeclaredClasses(klass); |
| } |
| if (classes == nullptr) { |
| // Return an empty array instead of a null pointer. |
| if (soa.Self()->IsExceptionPending()) { |
| // Pending exception from GetDeclaredClasses. |
| return nullptr; |
| } |
| ObjPtr<mirror::Class> class_array_class = GetClassArrayClass(soa.Self()); |
| if (class_array_class == nullptr) { |
| return nullptr; |
| } |
| ObjPtr<mirror::ObjectArray<mirror::Class>> empty_array = |
| mirror::ObjectArray<mirror::Class>::Alloc(soa.Self(), class_array_class, 0); |
| return soa.AddLocalReference<jobjectArray>(empty_array); |
| } |
| return soa.AddLocalReference<jobjectArray>(classes); |
| } |
| |
| static jclass Class_getEnclosingClass(JNIEnv* env, jobject javaThis) { |
| ScopedFastNativeObjectAccess soa(env); |
| StackHandleScope<1> hs(soa.Self()); |
| Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis))); |
| if (klass->IsProxyClass() || klass->GetDexCache() == nullptr) { |
| return nullptr; |
| } |
| return soa.AddLocalReference<jclass>(annotations::GetEnclosingClass(klass)); |
| } |
| |
| static jobject Class_getEnclosingConstructorNative(JNIEnv* env, jobject javaThis) { |
| ScopedFastNativeObjectAccess soa(env); |
| StackHandleScope<1> hs(soa.Self()); |
| Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis))); |
| if (klass->IsProxyClass() || klass->GetDexCache() == nullptr) { |
| return nullptr; |
| } |
| ObjPtr<mirror::Object> method = annotations::GetEnclosingMethod(klass); |
| if (method != nullptr) { |
| if (soa.Decode<mirror::Class>(WellKnownClasses::java_lang_reflect_Constructor) == |
| method->GetClass()) { |
| return soa.AddLocalReference<jobject>(method); |
| } |
| } |
| return nullptr; |
| } |
| |
| static jobject Class_getEnclosingMethodNative(JNIEnv* env, jobject javaThis) { |
| ScopedFastNativeObjectAccess soa(env); |
| StackHandleScope<1> hs(soa.Self()); |
| Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis))); |
| if (klass->IsProxyClass() || klass->GetDexCache() == nullptr) { |
| return nullptr; |
| } |
| ObjPtr<mirror::Object> method = annotations::GetEnclosingMethod(klass); |
| if (method != nullptr) { |
| if (soa.Decode<mirror::Class>(WellKnownClasses::java_lang_reflect_Method) == |
| method->GetClass()) { |
| return soa.AddLocalReference<jobject>(method); |
| } |
| } |
| return nullptr; |
| } |
| |
| static jint Class_getInnerClassFlags(JNIEnv* env, jobject javaThis, jint defaultValue) { |
| ScopedFastNativeObjectAccess soa(env); |
| StackHandleScope<1> hs(soa.Self()); |
| Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis))); |
| return mirror::Class::GetInnerClassFlags(klass, defaultValue); |
| } |
| |
| static jstring Class_getInnerClassName(JNIEnv* env, jobject javaThis) { |
| ScopedFastNativeObjectAccess soa(env); |
| StackHandleScope<1> hs(soa.Self()); |
| Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis))); |
| if (klass->IsProxyClass() || klass->GetDexCache() == nullptr) { |
| return nullptr; |
| } |
| mirror::String* class_name = nullptr; |
| if (!annotations::GetInnerClass(klass, &class_name)) { |
| return nullptr; |
| } |
| return soa.AddLocalReference<jstring>(class_name); |
| } |
| |
| static jobjectArray Class_getSignatureAnnotation(JNIEnv* env, jobject javaThis) { |
| ScopedFastNativeObjectAccess soa(env); |
| StackHandleScope<1> hs(soa.Self()); |
| Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis))); |
| if (klass->IsProxyClass() || klass->GetDexCache() == nullptr) { |
| return nullptr; |
| } |
| return soa.AddLocalReference<jobjectArray>( |
| annotations::GetSignatureAnnotationForClass(klass)); |
| } |
| |
| static jboolean Class_isAnonymousClass(JNIEnv* env, jobject javaThis) { |
| ScopedFastNativeObjectAccess soa(env); |
| StackHandleScope<1> hs(soa.Self()); |
| Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis))); |
| if (klass->IsProxyClass() || klass->GetDexCache() == nullptr) { |
| return false; |
| } |
| mirror::String* class_name = nullptr; |
| if (!annotations::GetInnerClass(klass, &class_name)) { |
| return false; |
| } |
| return class_name == nullptr; |
| } |
| |
| static jboolean Class_isDeclaredAnnotationPresent(JNIEnv* env, jobject javaThis, |
| jclass annotationType) { |
| ScopedFastNativeObjectAccess soa(env); |
| StackHandleScope<2> hs(soa.Self()); |
| Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis))); |
| if (klass->IsProxyClass() || klass->GetDexCache() == nullptr) { |
| return false; |
| } |
| Handle<mirror::Class> annotation_class(hs.NewHandle(soa.Decode<mirror::Class>(annotationType))); |
| return annotations::IsClassAnnotationPresent(klass, annotation_class); |
| } |
| |
| static jclass Class_getDeclaringClass(JNIEnv* env, jobject javaThis) { |
| ScopedFastNativeObjectAccess soa(env); |
| StackHandleScope<1> hs(soa.Self()); |
| Handle<mirror::Class> klass(hs.NewHandle(DecodeClass(soa, javaThis))); |
| if (klass->IsProxyClass() || klass->GetDexCache() == nullptr) { |
| return nullptr; |
| } |
| // Return null for anonymous classes. |
| if (Class_isAnonymousClass(env, javaThis)) { |
| return nullptr; |
| } |
| return soa.AddLocalReference<jclass>(annotations::GetDeclaringClass(klass)); |
| } |
| |
| static jobject Class_newInstance(JNIEnv* env, jobject javaThis) { |
| ScopedFastNativeObjectAccess soa(env); |
| StackHandleScope<4> hs(soa.Self()); |
| Handle<mirror::Class> klass = hs.NewHandle(DecodeClass(soa, javaThis)); |
| if (UNLIKELY(klass->GetPrimitiveType() != 0 || klass->IsInterface() || klass->IsArrayClass() || |
| klass->IsAbstract())) { |
| soa.Self()->ThrowNewExceptionF("Ljava/lang/InstantiationException;", |
| "%s cannot be instantiated", |
| klass->PrettyClass().c_str()); |
| return nullptr; |
| } |
| auto caller = hs.NewHandle<mirror::Class>(nullptr); |
| // Verify that we can access the class. |
| if (!klass->IsPublic()) { |
| caller.Assign(GetCallingClass(soa.Self(), 1)); |
| if (caller != nullptr && !caller->CanAccess(klass.Get())) { |
| soa.Self()->ThrowNewExceptionF( |
| "Ljava/lang/IllegalAccessException;", "%s is not accessible from %s", |
| klass->PrettyClass().c_str(), caller->PrettyClass().c_str()); |
| return nullptr; |
| } |
| } |
| ArtMethod* constructor = klass->GetDeclaredConstructor( |
| soa.Self(), |
| ScopedNullHandle<mirror::ObjectArray<mirror::Class>>(), |
| kRuntimePointerSize); |
| if (UNLIKELY(constructor == nullptr) || ShouldBlockAccessToMember(constructor, soa.Self())) { |
| soa.Self()->ThrowNewExceptionF("Ljava/lang/InstantiationException;", |
| "%s has no zero argument constructor", |
| klass->PrettyClass().c_str()); |
| return nullptr; |
| } |
| // Invoke the string allocator to return an empty string for the string class. |
| if (klass->IsStringClass()) { |
| gc::AllocatorType allocator_type = Runtime::Current()->GetHeap()->GetCurrentAllocator(); |
| ObjPtr<mirror::Object> obj = mirror::String::AllocEmptyString<true>(soa.Self(), allocator_type); |
| if (UNLIKELY(soa.Self()->IsExceptionPending())) { |
| return nullptr; |
| } else { |
| return soa.AddLocalReference<jobject>(obj); |
| } |
| } |
| auto receiver = hs.NewHandle(klass->AllocObject(soa.Self())); |
| if (UNLIKELY(receiver == nullptr)) { |
| soa.Self()->AssertPendingOOMException(); |
| return nullptr; |
| } |
| // Verify that we can access the constructor. |
| auto* declaring_class = constructor->GetDeclaringClass(); |
| if (!constructor->IsPublic()) { |
| if (caller == nullptr) { |
| caller.Assign(GetCallingClass(soa.Self(), 1)); |
| } |
| if (UNLIKELY(caller != nullptr && !VerifyAccess(receiver.Get(), |
| declaring_class, |
| constructor->GetAccessFlags(), |
| caller.Get()))) { |
| soa.Self()->ThrowNewExceptionF( |
| "Ljava/lang/IllegalAccessException;", "%s is not accessible from %s", |
| constructor->PrettyMethod().c_str(), caller->PrettyClass().c_str()); |
| return nullptr; |
| } |
| } |
| // Ensure that we are initialized. |
| if (UNLIKELY(!declaring_class->IsInitialized())) { |
| if (!Runtime::Current()->GetClassLinker()->EnsureInitialized( |
| soa.Self(), hs.NewHandle(declaring_class), true, true)) { |
| soa.Self()->AssertPendingException(); |
| return nullptr; |
| } |
| } |
| // Invoke the constructor. |
| JValue result; |
| uint32_t args[1] = { static_cast<uint32_t>(reinterpret_cast<uintptr_t>(receiver.Get())) }; |
| constructor->Invoke(soa.Self(), args, sizeof(args), &result, "V"); |
| if (UNLIKELY(soa.Self()->IsExceptionPending())) { |
| return nullptr; |
| } |
| // Constructors are ()V methods, so we shouldn't touch the result of InvokeMethod. |
| return soa.AddLocalReference<jobject>(receiver.Get()); |
| } |
| |
| static JNINativeMethod gMethods[] = { |
| FAST_NATIVE_METHOD(Class, classForName, |
| "(Ljava/lang/String;ZLjava/lang/ClassLoader;)Ljava/lang/Class;"), |
| FAST_NATIVE_METHOD(Class, getDeclaredAnnotation, |
| "(Ljava/lang/Class;)Ljava/lang/annotation/Annotation;"), |
| FAST_NATIVE_METHOD(Class, getDeclaredAnnotations, "()[Ljava/lang/annotation/Annotation;"), |
| FAST_NATIVE_METHOD(Class, getDeclaredClasses, "()[Ljava/lang/Class;"), |
| FAST_NATIVE_METHOD(Class, getDeclaredConstructorInternal, |
| "([Ljava/lang/Class;)Ljava/lang/reflect/Constructor;"), |
| FAST_NATIVE_METHOD(Class, getDeclaredConstructorsInternal, "(Z)[Ljava/lang/reflect/Constructor;"), |
| FAST_NATIVE_METHOD(Class, getDeclaredField, "(Ljava/lang/String;)Ljava/lang/reflect/Field;"), |
| FAST_NATIVE_METHOD(Class, getPublicFieldRecursive, "(Ljava/lang/String;)Ljava/lang/reflect/Field;"), |
| FAST_NATIVE_METHOD(Class, getDeclaredFields, "()[Ljava/lang/reflect/Field;"), |
| FAST_NATIVE_METHOD(Class, getDeclaredFieldsUnchecked, "(Z)[Ljava/lang/reflect/Field;"), |
| FAST_NATIVE_METHOD(Class, getDeclaredMethodInternal, |
| "(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;"), |
| FAST_NATIVE_METHOD(Class, getDeclaredMethodsUnchecked, |
| "(Z)[Ljava/lang/reflect/Method;"), |
| FAST_NATIVE_METHOD(Class, getDeclaringClass, "()Ljava/lang/Class;"), |
| FAST_NATIVE_METHOD(Class, getEnclosingClass, "()Ljava/lang/Class;"), |
| FAST_NATIVE_METHOD(Class, getEnclosingConstructorNative, "()Ljava/lang/reflect/Constructor;"), |
| FAST_NATIVE_METHOD(Class, getEnclosingMethodNative, "()Ljava/lang/reflect/Method;"), |
| FAST_NATIVE_METHOD(Class, getInnerClassFlags, "(I)I"), |
| FAST_NATIVE_METHOD(Class, getInnerClassName, "()Ljava/lang/String;"), |
| FAST_NATIVE_METHOD(Class, getInterfacesInternal, "()[Ljava/lang/Class;"), |
| FAST_NATIVE_METHOD(Class, getPrimitiveClass, "(Ljava/lang/String;)Ljava/lang/Class;"), |
| FAST_NATIVE_METHOD(Class, getNameNative, "()Ljava/lang/String;"), |
| FAST_NATIVE_METHOD(Class, getPublicDeclaredFields, "()[Ljava/lang/reflect/Field;"), |
| FAST_NATIVE_METHOD(Class, getSignatureAnnotation, "()[Ljava/lang/String;"), |
| FAST_NATIVE_METHOD(Class, isAnonymousClass, "()Z"), |
| FAST_NATIVE_METHOD(Class, isDeclaredAnnotationPresent, "(Ljava/lang/Class;)Z"), |
| FAST_NATIVE_METHOD(Class, newInstance, "()Ljava/lang/Object;"), |
| }; |
| |
| void register_java_lang_Class(JNIEnv* env) { |
| REGISTER_NATIVE_METHODS("java/lang/Class"); |
| } |
| |
| } // namespace art |
