| /* 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 "transform.h" |
| |
| #include <stddef.h> |
| #include <sys/types.h> |
| |
| #include <unordered_map> |
| #include <unordered_set> |
| |
| #include "art_method.h" |
| #include "base/array_ref.h" |
| #include "base/globals.h" |
| #include "base/logging.h" |
| #include "base/mem_map.h" |
| #include "class_linker.h" |
| #include "dex/dex_file.h" |
| #include "dex/dex_file_types.h" |
| #include "dex/utf.h" |
| #include "events-inl.h" |
| #include "events.h" |
| #include "fault_handler.h" |
| #include "gc_root-inl.h" |
| #include "handle_scope-inl.h" |
| #include "jni/jni_env_ext-inl.h" |
| #include "jvalue.h" |
| #include "jvmti.h" |
| #include "linear_alloc.h" |
| #include "mirror/array.h" |
| #include "mirror/class-inl.h" |
| #include "mirror/class_ext.h" |
| #include "mirror/class_loader-inl.h" |
| #include "mirror/string-inl.h" |
| #include "oat/oat_file.h" |
| #include "scoped_thread_state_change-inl.h" |
| #include "stack.h" |
| #include "thread_list.h" |
| #include "ti_logging.h" |
| #include "ti_redefine.h" |
| |
| namespace openjdkjvmti { |
| |
| static EventHandler* gEventHandler = nullptr; |
| |
| void Transformer::Register(EventHandler* eh) { |
| gEventHandler = eh; |
| } |
| |
| // Initialize templates. |
| template void Transformer::CallClassFileLoadHooksSingleClass< |
| ArtJvmtiEvent::kClassFileLoadHookNonRetransformable>(EventHandler* event_handler, |
| art::Thread* self, |
| /*in-out*/ ArtClassDefinition* def); |
| template void Transformer::CallClassFileLoadHooksSingleClass< |
| ArtJvmtiEvent::kClassFileLoadHookRetransformable>(EventHandler* event_handler, |
| art::Thread* self, |
| /*in-out*/ ArtClassDefinition* def); |
| template void Transformer::CallClassFileLoadHooksSingleClass< |
| ArtJvmtiEvent::kStructuralDexFileLoadHook>(EventHandler* event_handler, |
| art::Thread* self, |
| /*in-out*/ ArtClassDefinition* def); |
| |
| template <ArtJvmtiEvent kEvent> |
| void Transformer::CallClassFileLoadHooksSingleClass(EventHandler* event_handler, |
| art::Thread* self, |
| /*in-out*/ ArtClassDefinition* def) { |
| static_assert(kEvent == ArtJvmtiEvent::kClassFileLoadHookNonRetransformable || |
| kEvent == ArtJvmtiEvent::kClassFileLoadHookRetransformable || |
| kEvent == ArtJvmtiEvent::kStructuralDexFileLoadHook, |
| "bad event type"); |
| // We don't want to do transitions between calling the event and setting the new data so change to |
| // native state early. |
| art::ScopedThreadStateChange stsc(self, art::ThreadState::kNative); |
| jint new_len = -1; |
| unsigned char* new_data = nullptr; |
| art::ArrayRef<const unsigned char> dex_data = def->GetDexData(); |
| event_handler->DispatchEvent<kEvent>( |
| self, |
| static_cast<JNIEnv*>(self->GetJniEnv()), |
| def->GetClass(), |
| def->GetLoader(), |
| def->GetName().c_str(), |
| def->GetProtectionDomain(), |
| static_cast<jint>(dex_data.size()), |
| dex_data.data(), |
| /*out*/&new_len, |
| /*out*/&new_data); |
| def->SetNewDexData(new_len, new_data, kEvent); |
| } |
| |
| template <RedefinitionType kType> |
| void Transformer::CallClassFileLoadHooks(art::Thread* self, |
| /*in-out*/ std::vector<ArtClassDefinition>* definitions) { |
| if (kType == RedefinitionType::kNormal) { |
| // For normal redefinition we have to call ClassFileLoadHook according to the spec. We use an |
| // internal event "ClassFileLoadHookRetransformable" for agents that can redefine and a |
| // "ClassFileLoadHookNonRetransformable" for agents that cannot redefine. When an agent is |
| // attached to a non-debuggable environment, we cannot redefine any classes. Splitting the |
| // ClassFileLoadHooks allows us to differentiate between these two cases. This method is only |
| // called when redefinition is allowed so just run ClassFileLoadHookRetransformable hooks. |
| for (ArtClassDefinition& def : *definitions) { |
| CallClassFileLoadHooksSingleClass<ArtJvmtiEvent::kClassFileLoadHookRetransformable>( |
| gEventHandler, self, &def); |
| } |
| } else { |
| // For structural redefinition we call StructualDexFileLoadHook in addition to the |
| // ClassFileLoadHooks. This let's us specify if structural modifications are allowed. |
| // TODO(mythria): The spec only specifies we need to call ClassFileLoadHooks, the |
| // StructuralDexFileLoadHooks is internal to ART. It is not clear if we need to run all |
| // StructuralDexFileHooks before ClassFileLoadHooks. Doing it this way to keep the existing |
| // behaviour. |
| for (ArtClassDefinition& def : *definitions) { |
| CallClassFileLoadHooksSingleClass<ArtJvmtiEvent::kStructuralDexFileLoadHook>( |
| gEventHandler, self, &def); |
| } |
| for (ArtClassDefinition& def : *definitions) { |
| CallClassFileLoadHooksSingleClass<ArtJvmtiEvent::kClassFileLoadHookRetransformable>( |
| gEventHandler, self, &def); |
| } |
| } |
| } |
| |
| template void Transformer::CallClassFileLoadHooks<RedefinitionType::kNormal>( |
| art::Thread* self, /*in-out*/ std::vector<ArtClassDefinition>* definitions); |
| template void Transformer::CallClassFileLoadHooks<RedefinitionType::kStructural>( |
| art::Thread* self, /*in-out*/ std::vector<ArtClassDefinition>* definitions); |
| |
| jvmtiError Transformer::RetransformClasses(jvmtiEnv* env, |
| jint class_count, |
| const jclass* classes) { |
| if (class_count < 0) { |
| JVMTI_LOG(WARNING, env) << "FAILURE TO RETRANSFORM class_count was less then 0"; |
| return ERR(ILLEGAL_ARGUMENT); |
| } else if (class_count == 0) { |
| // We don't actually need to do anything. Just return OK. |
| return OK; |
| } else if (classes == nullptr) { |
| JVMTI_LOG(WARNING, env) << "FAILURE TO RETRANSFORM null classes!"; |
| return ERR(NULL_POINTER); |
| } |
| art::Thread* self = art::Thread::Current(); |
| art::Runtime* runtime = art::Runtime::Current(); |
| // A holder that will Deallocate all the class bytes buffers on destruction. |
| std::string error_msg; |
| std::vector<ArtClassDefinition> definitions; |
| jvmtiError res = OK; |
| for (jint i = 0; i < class_count; i++) { |
| res = Redefiner::CanRedefineClass<RedefinitionType::kNormal>(classes[i], &error_msg); |
| if (res != OK) { |
| JVMTI_LOG(WARNING, env) << "FAILURE TO RETRANSFORM " << error_msg; |
| return res; |
| } |
| ArtClassDefinition def; |
| res = def.Init(self, classes[i]); |
| if (res != OK) { |
| JVMTI_LOG(WARNING, env) << "FAILURE TO RETRANSFORM definition init failed"; |
| return res; |
| } |
| definitions.push_back(std::move(def)); |
| } |
| |
| CallClassFileLoadHooks<RedefinitionType::kStructural>(self, &definitions); |
| RedefinitionType redef_type = |
| std::any_of(definitions.cbegin(), |
| definitions.cend(), |
| [](const auto& it) { return it.HasStructuralChanges(); }) |
| ? RedefinitionType::kStructural |
| : RedefinitionType::kNormal; |
| res = Redefiner::RedefineClassesDirect( |
| ArtJvmTiEnv::AsArtJvmTiEnv(env), runtime, self, definitions, redef_type, &error_msg); |
| if (res != OK) { |
| JVMTI_LOG(WARNING, env) << "FAILURE TO RETRANSFORM " << error_msg; |
| } |
| return res; |
| } |
| |
| // TODO Move this somewhere else, ti_class? |
| jvmtiError GetClassLocation(ArtJvmTiEnv* env, jclass klass, /*out*/std::string* location) { |
| JNIEnv* jni_env = nullptr; |
| jint ret = env->art_vm->GetEnv(reinterpret_cast<void**>(&jni_env), JNI_VERSION_1_1); |
| if (ret != JNI_OK) { |
| // TODO Different error might be better? |
| return ERR(INTERNAL); |
| } |
| art::ScopedObjectAccess soa(jni_env); |
| art::StackHandleScope<1> hs(art::Thread::Current()); |
| art::Handle<art::mirror::Class> hs_klass(hs.NewHandle(soa.Decode<art::mirror::Class>(klass))); |
| const art::DexFile& dex = hs_klass->GetDexFile(); |
| *location = dex.GetLocation(); |
| return OK; |
| } |
| |
| } // namespace openjdkjvmti |