| /* Copyright (C) 2017 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_search.h" |
| |
| #include "jni.h" |
| |
| #include "art_field-inl.h" |
| #include "art_jvmti.h" |
| #include "base/enums.h" |
| #include "base/macros.h" |
| #include "class_linker.h" |
| #include "dex_file.h" |
| #include "jni_internal.h" |
| #include "mirror/class-inl.h" |
| #include "mirror/object.h" |
| #include "mirror/string.h" |
| #include "nativehelper/ScopedLocalRef.h" |
| #include "obj_ptr-inl.h" |
| #include "runtime.h" |
| #include "runtime_callbacks.h" |
| #include "scoped_thread_state_change-inl.h" |
| #include "thread-current-inl.h" |
| #include "thread_list.h" |
| #include "ti_phase.h" |
| #include "well_known_classes.h" |
| |
| namespace openjdkjvmti { |
| |
| static std::vector<std::string> gSystemOnloadSegments; |
| |
| static art::ObjPtr<art::mirror::Object> GetSystemProperties(art::Thread* self, |
| art::ClassLinker* class_linker) |
| REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| art::ObjPtr<art::mirror::Class> system_class = |
| class_linker->LookupClass(self, "Ljava/lang/System;", nullptr); |
| DCHECK(system_class != nullptr); |
| DCHECK(system_class->IsInitialized()); |
| |
| art::ArtField* props_field = |
| system_class->FindDeclaredStaticField("props", "Ljava/util/Properties;"); |
| DCHECK(props_field != nullptr); |
| |
| art::ObjPtr<art::mirror::Object> props_obj = props_field->GetObject(system_class); |
| DCHECK(props_obj != nullptr); |
| |
| return props_obj; |
| } |
| |
| static void Update() REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| if (gSystemOnloadSegments.empty()) { |
| return; |
| } |
| |
| // In the on-load phase we have to modify java.class.path to influence the system classloader. |
| // As this is an unmodifiable system property, we have to access the "defaults" field. |
| art::ClassLinker* class_linker = art::Runtime::Current()->GetClassLinker(); |
| DCHECK(class_linker != nullptr); |
| art::Thread* self = art::Thread::Current(); |
| |
| // Prepare: collect classes, fields and methods. |
| art::ObjPtr<art::mirror::Class> properties_class = |
| class_linker->LookupClass(self, "Ljava/util/Properties;", nullptr); |
| DCHECK(properties_class != nullptr); |
| |
| ScopedLocalRef<jobject> defaults_jobj(self->GetJniEnv(), nullptr); |
| { |
| art::ObjPtr<art::mirror::Object> props_obj = GetSystemProperties(self, class_linker); |
| |
| art::ArtField* defaults_field = |
| properties_class->FindDeclaredInstanceField("defaults", "Ljava/util/Properties;"); |
| DCHECK(defaults_field != nullptr); |
| |
| art::ObjPtr<art::mirror::Object> defaults_obj = defaults_field->GetObject(props_obj); |
| DCHECK(defaults_obj != nullptr); |
| defaults_jobj.reset(self->GetJniEnv()->AddLocalReference<jobject>(defaults_obj)); |
| } |
| |
| art::ArtMethod* get_property = |
| properties_class->FindDeclaredVirtualMethod( |
| "getProperty", |
| "(Ljava/lang/String;)Ljava/lang/String;", |
| art::kRuntimePointerSize); |
| DCHECK(get_property != nullptr); |
| art::ArtMethod* set_property = |
| properties_class->FindDeclaredVirtualMethod( |
| "setProperty", |
| "(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/Object;", |
| art::kRuntimePointerSize); |
| DCHECK(set_property != nullptr); |
| |
| // This is an allocation. Do this late to avoid the need for handles. |
| ScopedLocalRef<jobject> cp_jobj(self->GetJniEnv(), nullptr); |
| { |
| art::ObjPtr<art::mirror::Object> cp_key = |
| art::mirror::String::AllocFromModifiedUtf8(self, "java.class.path"); |
| if (cp_key == nullptr) { |
| self->AssertPendingOOMException(); |
| self->ClearException(); |
| return; |
| } |
| cp_jobj.reset(self->GetJniEnv()->AddLocalReference<jobject>(cp_key)); |
| } |
| |
| // OK, now get the current value. |
| std::string str_value; |
| { |
| ScopedLocalRef<jobject> old_value(self->GetJniEnv(), |
| self->GetJniEnv()->CallObjectMethod( |
| defaults_jobj.get(), |
| art::jni::EncodeArtMethod(get_property), |
| cp_jobj.get())); |
| DCHECK(old_value.get() != nullptr); |
| |
| str_value = self->DecodeJObject(old_value.get())->AsString()->ToModifiedUtf8(); |
| self->GetJniEnv()->DeleteLocalRef(old_value.release()); |
| } |
| |
| // Update the value by appending the new segments. |
| for (const std::string& segment : gSystemOnloadSegments) { |
| if (!str_value.empty()) { |
| str_value += ":"; |
| } |
| str_value += segment; |
| } |
| gSystemOnloadSegments.clear(); |
| |
| // Create the new value object. |
| ScopedLocalRef<jobject> new_val_jobj(self->GetJniEnv(), nullptr); |
| { |
| art::ObjPtr<art::mirror::Object> new_value = |
| art::mirror::String::AllocFromModifiedUtf8(self, str_value.c_str()); |
| if (new_value == nullptr) { |
| self->AssertPendingOOMException(); |
| self->ClearException(); |
| return; |
| } |
| |
| new_val_jobj.reset(self->GetJniEnv()->AddLocalReference<jobject>(new_value)); |
| } |
| |
| // Write to the defaults. |
| ScopedLocalRef<jobject> res_obj(self->GetJniEnv(), |
| self->GetJniEnv()->CallObjectMethod(defaults_jobj.get(), |
| art::jni::EncodeArtMethod(set_property), |
| cp_jobj.get(), |
| new_val_jobj.get())); |
| if (self->IsExceptionPending()) { |
| self->ClearException(); |
| return; |
| } |
| } |
| |
| struct SearchCallback : public art::RuntimePhaseCallback { |
| void NextRuntimePhase(RuntimePhase phase) OVERRIDE REQUIRES_SHARED(art::Locks::mutator_lock_) { |
| if (phase == RuntimePhase::kStart) { |
| // It's time to update the system properties. |
| Update(); |
| } |
| } |
| }; |
| |
| static SearchCallback gSearchCallback; |
| |
| void SearchUtil::Register() { |
| art::Runtime* runtime = art::Runtime::Current(); |
| |
| art::ScopedThreadStateChange stsc(art::Thread::Current(), |
| art::ThreadState::kWaitingForDebuggerToAttach); |
| art::ScopedSuspendAll ssa("Add search callback"); |
| runtime->GetRuntimeCallbacks()->AddRuntimePhaseCallback(&gSearchCallback); |
| } |
| |
| void SearchUtil::Unregister() { |
| art::ScopedThreadStateChange stsc(art::Thread::Current(), |
| art::ThreadState::kWaitingForDebuggerToAttach); |
| art::ScopedSuspendAll ssa("Remove search callback"); |
| art::Runtime* runtime = art::Runtime::Current(); |
| runtime->GetRuntimeCallbacks()->RemoveRuntimePhaseCallback(&gSearchCallback); |
| } |
| |
| jvmtiError SearchUtil::AddToBootstrapClassLoaderSearch(jvmtiEnv* env ATTRIBUTE_UNUSED, |
| const char* segment) { |
| art::Runtime* current = art::Runtime::Current(); |
| if (current == nullptr) { |
| return ERR(WRONG_PHASE); |
| } |
| if (current->GetClassLinker() == nullptr) { |
| return ERR(WRONG_PHASE); |
| } |
| if (segment == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| std::string error_msg; |
| std::vector<std::unique_ptr<const art::DexFile>> dex_files; |
| if (!art::DexFile::Open(segment, segment, true, &error_msg, &dex_files)) { |
| LOG(WARNING) << "Could not open " << segment << " for boot classpath extension: " << error_msg; |
| return ERR(ILLEGAL_ARGUMENT); |
| } |
| |
| art::ScopedObjectAccess soa(art::Thread::Current()); |
| for (std::unique_ptr<const art::DexFile>& dex_file : dex_files) { |
| current->GetClassLinker()->AppendToBootClassPath(art::Thread::Current(), *dex_file.release()); |
| } |
| |
| return ERR(NONE); |
| } |
| |
| jvmtiError SearchUtil::AddToSystemClassLoaderSearch(jvmtiEnv* jvmti_env ATTRIBUTE_UNUSED, |
| const char* segment) { |
| if (segment == nullptr) { |
| return ERR(NULL_POINTER); |
| } |
| |
| jvmtiPhase phase = PhaseUtil::GetPhaseUnchecked(); |
| |
| if (phase == jvmtiPhase::JVMTI_PHASE_ONLOAD) { |
| // We could try and see whether it is a valid path. We could also try to allocate Java |
| // objects to avoid later OOME. |
| gSystemOnloadSegments.push_back(segment); |
| return ERR(NONE); |
| } else if (phase != jvmtiPhase::JVMTI_PHASE_LIVE) { |
| return ERR(WRONG_PHASE); |
| } |
| |
| jobject sys_class_loader = art::Runtime::Current()->GetSystemClassLoader(); |
| if (sys_class_loader == nullptr) { |
| // This is unexpected. |
| return ERR(INTERNAL); |
| } |
| |
| // We'll use BaseDexClassLoader.addDexPath, as it takes care of array resizing etc. As a downside, |
| // exceptions are swallowed. |
| |
| art::Thread* self = art::Thread::Current(); |
| JNIEnv* env = self->GetJniEnv(); |
| if (!env->IsInstanceOf(sys_class_loader, |
| art::WellKnownClasses::dalvik_system_BaseDexClassLoader)) { |
| return ERR(INTERNAL); |
| } |
| |
| jmethodID add_dex_path_id = env->GetMethodID( |
| art::WellKnownClasses::dalvik_system_BaseDexClassLoader, |
| "addDexPath", |
| "(Ljava/lang/String;)V"); |
| if (add_dex_path_id == nullptr) { |
| return ERR(INTERNAL); |
| } |
| |
| ScopedLocalRef<jstring> dex_path(env, env->NewStringUTF(segment)); |
| if (dex_path.get() == nullptr) { |
| return ERR(INTERNAL); |
| } |
| env->CallVoidMethod(sys_class_loader, add_dex_path_id, dex_path.get()); |
| |
| if (env->ExceptionCheck()) { |
| env->ExceptionClear(); |
| return ERR(ILLEGAL_ARGUMENT); |
| } |
| return ERR(NONE); |
| } |
| |
| } // namespace openjdkjvmti |