| /* Copyright (C) 2016 The Android Open Source Project |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This file implements interfaces from the file jvmti.h. This implementation |
| * is licensed under the same terms as the file jvmti.h. The |
| * copyright and license information for the file jvmti.h follows. |
| * |
| * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| #include "ti_class.h" |
| |
| #include "art_jvmti.h" |
| #include "class_table-inl.h" |
| #include "class_linker.h" |
| #include "jni_internal.h" |
| #include "runtime.h" |
| #include "scoped_thread_state_change-inl.h" |
| #include "thread-inl.h" |
| |
| namespace openjdkjvmti { |
| |
| jvmtiError ClassUtil::GetClassFields(jvmtiEnv* env, |
| jclass jklass, |
| jint* field_count_ptr, |
| jfieldID** fields_ptr) { |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| art::ObjPtr<art::mirror::Class> klass = soa.Decode<art::mirror::Class>(jklass); |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| |
| if (field_count_ptr == nullptr || fields_ptr == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| art::IterationRange<art::StrideIterator<art::ArtField>> ifields = klass->GetIFields(); |
| art::IterationRange<art::StrideIterator<art::ArtField>> sfields = klass->GetSFields(); |
| size_t array_size = klass->NumInstanceFields() + klass->NumStaticFields(); |
| |
| unsigned char* out_ptr; |
| jvmtiError allocError = env->Allocate(array_size * sizeof(jfieldID), &out_ptr); |
| if (allocError != ERR(NONE)) { |
| return allocError; |
| } |
| jfieldID* field_array = reinterpret_cast<jfieldID*>(out_ptr); |
| |
| size_t array_idx = 0; |
| for (art::ArtField& field : sfields) { |
| field_array[array_idx] = art::jni::EncodeArtField(&field); |
| ++array_idx; |
| } |
| for (art::ArtField& field : ifields) { |
| field_array[array_idx] = art::jni::EncodeArtField(&field); |
| ++array_idx; |
| } |
| |
| *field_count_ptr = static_cast<jint>(array_size); |
| *fields_ptr = field_array; |
| |
| return ERR(NONE); |
| } |
| |
| jvmtiError ClassUtil::GetClassMethods(jvmtiEnv* env, |
| jclass jklass, |
| jint* method_count_ptr, |
| jmethodID** methods_ptr) { |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| art::ObjPtr<art::mirror::Class> klass = soa.Decode<art::mirror::Class>(jklass); |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| |
| if (method_count_ptr == nullptr || methods_ptr == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| size_t array_size = klass->NumDeclaredVirtualMethods() + klass->NumDirectMethods(); |
| unsigned char* out_ptr; |
| jvmtiError allocError = env->Allocate(array_size * sizeof(jmethodID), &out_ptr); |
| if (allocError != ERR(NONE)) { |
| return allocError; |
| } |
| jmethodID* method_array = reinterpret_cast<jmethodID*>(out_ptr); |
| |
| if (art::kIsDebugBuild) { |
| size_t count = 0; |
| for (auto& m ATTRIBUTE_UNUSED : klass->GetDeclaredMethods(art::kRuntimePointerSize)) { |
| count++; |
| } |
| CHECK_EQ(count, klass->NumDirectMethods() + klass->NumDeclaredVirtualMethods()); |
| } |
| |
| size_t array_idx = 0; |
| for (auto& m : klass->GetDeclaredMethods(art::kRuntimePointerSize)) { |
| method_array[array_idx] = art::jni::EncodeArtMethod(&m); |
| ++array_idx; |
| } |
| |
| *method_count_ptr = static_cast<jint>(array_size); |
| *methods_ptr = method_array; |
| |
| return ERR(NONE); |
| } |
| |
| jvmtiError ClassUtil::GetImplementedInterfaces(jvmtiEnv* env, |
| jclass jklass, |
| jint* interface_count_ptr, |
| jclass** interfaces_ptr) { |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| art::ObjPtr<art::mirror::Class> klass = soa.Decode<art::mirror::Class>(jklass); |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| |
| if (interface_count_ptr == nullptr || interfaces_ptr == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| // Need to handle array specifically. Arrays implement Serializable and Cloneable, but the |
| // spec says these should not be reported. |
| if (klass->IsArrayClass()) { |
| *interface_count_ptr = 0; |
| *interfaces_ptr = nullptr; // TODO: Should we allocate a dummy here? |
| return ERR(NONE); |
| } |
| |
| size_t array_size = klass->NumDirectInterfaces(); |
| unsigned char* out_ptr; |
| jvmtiError allocError = env->Allocate(array_size * sizeof(jclass), &out_ptr); |
| if (allocError != ERR(NONE)) { |
| return allocError; |
| } |
| jclass* interface_array = reinterpret_cast<jclass*>(out_ptr); |
| |
| art::StackHandleScope<1> hs(soa.Self()); |
| art::Handle<art::mirror::Class> h_klass(hs.NewHandle(klass)); |
| |
| for (uint32_t idx = 0; idx != array_size; ++idx) { |
| art::ObjPtr<art::mirror::Class> inf_klass = |
| art::mirror::Class::ResolveDirectInterface(soa.Self(), h_klass, idx); |
| if (inf_klass == nullptr) { |
| soa.Self()->ClearException(); |
| env->Deallocate(out_ptr); |
| // TODO: What is the right error code here? |
| return ERR(INTERNAL); |
| } |
| interface_array[idx] = soa.AddLocalReference<jclass>(inf_klass); |
| } |
| |
| *interface_count_ptr = static_cast<jint>(array_size); |
| *interfaces_ptr = interface_array; |
| |
| return ERR(NONE); |
| } |
| |
| jvmtiError ClassUtil::GetClassSignature(jvmtiEnv* env, |
| jclass jklass, |
| char** signature_ptr, |
| char** generic_ptr) { |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| art::ObjPtr<art::mirror::Class> klass = soa.Decode<art::mirror::Class>(jklass); |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| |
| JvmtiUniquePtr sig_copy; |
| if (signature_ptr != nullptr) { |
| std::string storage; |
| const char* descriptor = klass->GetDescriptor(&storage); |
| |
| unsigned char* tmp; |
| jvmtiError ret = CopyString(env, descriptor, &tmp); |
| if (ret != ERR(NONE)) { |
| return ret; |
| } |
| sig_copy = MakeJvmtiUniquePtr(env, tmp); |
| *signature_ptr = reinterpret_cast<char*>(tmp); |
| } |
| |
| // TODO: Support generic signature. |
| *generic_ptr = nullptr; |
| |
| // Everything is fine, release the buffers. |
| sig_copy.release(); |
| |
| return ERR(NONE); |
| } |
| |
| jvmtiError ClassUtil::GetClassStatus(jvmtiEnv* env ATTRIBUTE_UNUSED, |
| jclass jklass, |
| jint* status_ptr) { |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| art::ObjPtr<art::mirror::Class> klass = soa.Decode<art::mirror::Class>(jklass); |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| |
| if (status_ptr == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| if (klass->IsArrayClass()) { |
| *status_ptr = JVMTI_CLASS_STATUS_ARRAY; |
| } else if (klass->IsPrimitive()) { |
| *status_ptr = JVMTI_CLASS_STATUS_PRIMITIVE; |
| } else { |
| *status_ptr = JVMTI_CLASS_STATUS_VERIFIED; // All loaded classes are structurally verified. |
| // This is finicky. If there's an error, we'll say it wasn't prepared. |
| if (klass->IsResolved()) { |
| *status_ptr |= JVMTI_CLASS_STATUS_PREPARED; |
| } |
| if (klass->IsInitialized()) { |
| *status_ptr |= JVMTI_CLASS_STATUS_INITIALIZED; |
| } |
| // Technically the class may be erroneous for other reasons, but we do not have enough info. |
| if (klass->IsErroneous()) { |
| *status_ptr |= JVMTI_CLASS_STATUS_ERROR; |
| } |
| } |
| |
| return ERR(NONE); |
| } |
| |
| template <typename T> |
| static jvmtiError ClassIsT(jclass jklass, T test, jboolean* is_t_ptr) { |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| art::ObjPtr<art::mirror::Class> klass = soa.Decode<art::mirror::Class>(jklass); |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| |
| if (is_t_ptr == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| *is_t_ptr = test(klass) ? JNI_TRUE : JNI_FALSE; |
| return ERR(NONE); |
| } |
| |
| jvmtiError ClassUtil::IsInterface(jvmtiEnv* env ATTRIBUTE_UNUSED, |
| jclass jklass, |
| jboolean* is_interface_ptr) { |
| auto test = [](art::ObjPtr<art::mirror::Class> klass) REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| return klass->IsInterface(); |
| }; |
| return ClassIsT(jklass, test, is_interface_ptr); |
| } |
| |
| jvmtiError ClassUtil::IsArrayClass(jvmtiEnv* env ATTRIBUTE_UNUSED, |
| jclass jklass, |
| jboolean* is_array_class_ptr) { |
| auto test = [](art::ObjPtr<art::mirror::Class> klass) REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| return klass->IsArrayClass(); |
| }; |
| return ClassIsT(jklass, test, is_array_class_ptr); |
| } |
| |
| // Keep this in sync with Class.getModifiers(). |
| static uint32_t ClassGetModifiers(art::Thread* self, art::ObjPtr<art::mirror::Class> klass) |
| REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| if (klass->IsArrayClass()) { |
| uint32_t component_modifiers = ClassGetModifiers(self, klass->GetComponentType()); |
| if ((component_modifiers & art::kAccInterface) != 0) { |
| component_modifiers &= ~(art::kAccInterface | art::kAccStatic); |
| } |
| return art::kAccAbstract | art::kAccFinal | component_modifiers; |
| } |
| |
| uint32_t modifiers = klass->GetAccessFlags() & art::kAccJavaFlagsMask; |
| |
| art::StackHandleScope<1> hs(self); |
| art::Handle<art::mirror::Class> h_klass(hs.NewHandle(klass)); |
| return art::mirror::Class::GetInnerClassFlags(h_klass, modifiers); |
| } |
| |
| jvmtiError ClassUtil::GetClassModifiers(jvmtiEnv* env ATTRIBUTE_UNUSED, |
| jclass jklass, |
| jint* modifiers_ptr) { |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| art::ObjPtr<art::mirror::Class> klass = soa.Decode<art::mirror::Class>(jklass); |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| |
| if (modifiers_ptr == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| *modifiers_ptr = ClassGetModifiers(soa.Self(), klass); |
| |
| return ERR(NONE); |
| } |
| |
| jvmtiError ClassUtil::GetClassLoader(jvmtiEnv* env ATTRIBUTE_UNUSED, |
| jclass jklass, |
| jobject* classloader_ptr) { |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| art::ObjPtr<art::mirror::Class> klass = soa.Decode<art::mirror::Class>(jklass); |
| if (klass == nullptr) { |
| return ERR(INVALID_CLASS); |
| } |
| |
| if (classloader_ptr == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| *classloader_ptr = soa.AddLocalReference<jobject>(klass->GetClassLoader()); |
| |
| return ERR(NONE); |
| } |
| |
| jvmtiError ClassUtil::GetClassLoaderClasses(jvmtiEnv* env, |
| jobject initiating_loader, |
| jint* class_count_ptr, |
| jclass** classes_ptr) { |
| UNUSED(env, initiating_loader, class_count_ptr, classes_ptr); |
| |
| if (class_count_ptr == nullptr || classes_ptr == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| art::Thread* self = art::Thread::Current(); |
| if (!self->GetJniEnv()->IsInstanceOf(initiating_loader, |
| art::WellKnownClasses::java_lang_ClassLoader)) { |
| return ERR(ILLEGAL_ARGUMENT); |
| } |
| if (self->GetJniEnv()->IsInstanceOf(initiating_loader, |
| art::WellKnownClasses::java_lang_BootClassLoader)) { |
| // Need to use null for the BootClassLoader. |
| initiating_loader = nullptr; |
| } |
| |
| art::ScopedObjectAccess soa(self); |
| art::ObjPtr<art::mirror::ClassLoader> class_loader = |
| soa.Decode<art::mirror::ClassLoader>(initiating_loader); |
| |
| art::ClassLinker* class_linker = art::Runtime::Current()->GetClassLinker(); |
| |
| art::ReaderMutexLock mu(self, *art::Locks::classlinker_classes_lock_); |
| |
| art::ClassTable* class_table = class_linker->ClassTableForClassLoader(class_loader); |
| if (class_table == nullptr) { |
| // Nothing loaded. |
| *class_count_ptr = 0; |
| *classes_ptr = nullptr; |
| return ERR(NONE); |
| } |
| |
| struct ClassTableCount { |
| bool operator()(art::ObjPtr<art::mirror::Class> klass) { |
| DCHECK(klass != nullptr); |
| ++count; |
| return true; |
| } |
| |
| size_t count = 0; |
| }; |
| ClassTableCount ctc; |
| class_table->Visit(ctc); |
| |
| if (ctc.count == 0) { |
| // Nothing loaded. |
| *class_count_ptr = 0; |
| *classes_ptr = nullptr; |
| return ERR(NONE); |
| } |
| |
| unsigned char* data; |
| jvmtiError data_result = env->Allocate(ctc.count * sizeof(jclass), &data); |
| if (data_result != ERR(NONE)) { |
| return data_result; |
| } |
| jclass* class_array = reinterpret_cast<jclass*>(data); |
| |
| struct ClassTableFill { |
| bool operator()(art::ObjPtr<art::mirror::Class> klass) |
| REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| DCHECK(klass != nullptr); |
| DCHECK_LT(count, ctc_ref.count); |
| local_class_array[count++] = soa_ptr->AddLocalReference<jclass>(klass); |
| return true; |
| } |
| |
| jclass* local_class_array; |
| const ClassTableCount& ctc_ref; |
| art::ScopedObjectAccess* soa_ptr; |
| size_t count; |
| }; |
| ClassTableFill ctf = { class_array, ctc, &soa, 0 }; |
| class_table->Visit(ctf); |
| DCHECK_EQ(ctc.count, ctf.count); |
| |
| *class_count_ptr = ctc.count; |
| *classes_ptr = class_array; |
| |
| return ERR(NONE); |
| } |
| |
| } // namespace openjdkjvmti |
