name: "libopenjdkjvmti_defaults",
defaults: ["art_defaults"],
host_supported: true,
- srcs: ["OpenjdkJvmTi.cc",
+ srcs: ["events.cc",
+ "OpenjdkJvmTi.cc",
"transform.cc"],
include_dirs: ["art/runtime"],
shared_libs: [
#include "openjdkjvmti/jvmti.h"
#include "art_jvmti.h"
+#include "base/mutex.h"
+#include "events-inl.h"
#include "jni_env_ext-inl.h"
#include "object_tagging.h"
#include "obj_ptr-inl.h"
#include "runtime.h"
#include "scoped_thread_state_change-inl.h"
#include "thread_list.h"
+#include "thread-inl.h"
#include "transform.h"
// TODO Remove this at some point by annotating all the methods. It was put in to make the skeleton
namespace openjdkjvmti {
ObjectTagTable gObjectTagTable;
+EventHandler gEventHandler;
class JvmtiFunctions {
private:
return ERR(NOT_IMPLEMENTED);
}
+ // TODO: This will require locking, so that an agent can't remove callbacks when we're dispatching
+ // an event.
static jvmtiError SetEventCallbacks(jvmtiEnv* env,
const jvmtiEventCallbacks* callbacks,
jint size_of_callbacks) {
- return ERR(NOT_IMPLEMENTED);
+ if (env == nullptr) {
+ return ERR(NULL_POINTER);
+ }
+ if (size_of_callbacks < 0) {
+ return ERR(ILLEGAL_ARGUMENT);
+ }
+
+ if (callbacks == nullptr) {
+ ArtJvmTiEnv::AsArtJvmTiEnv(env)->event_callbacks.reset();
+ return ERR(NONE);
+ }
+
+ std::unique_ptr<jvmtiEventCallbacks> tmp(new jvmtiEventCallbacks());
+ memset(tmp.get(), 0, sizeof(jvmtiEventCallbacks));
+ size_t copy_size = std::min(sizeof(jvmtiEventCallbacks),
+ static_cast<size_t>(size_of_callbacks));
+ copy_size = art::RoundDown(copy_size, sizeof(void*));
+ memcpy(tmp.get(), callbacks, copy_size);
+
+ ArtJvmTiEnv::AsArtJvmTiEnv(env)->event_callbacks = std::move(tmp);
+
+ return ERR(NONE);
}
static jvmtiError SetEventNotificationMode(jvmtiEnv* env,
jvmtiEvent event_type,
jthread event_thread,
...) {
- return ERR(NOT_IMPLEMENTED);
+ art::Thread* art_thread = nullptr;
+ if (event_thread != nullptr) {
+ // TODO: Need non-aborting call here, to return JVMTI_ERROR_INVALID_THREAD.
+ art::ScopedObjectAccess soa(art::Thread::Current());
+ art::MutexLock mu(soa.Self(), *art::Locks::thread_list_lock_);
+ art_thread = art::Thread::FromManagedThread(soa, event_thread);
+
+ if (art_thread == nullptr || // The thread hasn't been started or is already dead.
+ art_thread->IsStillStarting()) {
+ // TODO: We may want to let the EventHandler know, so it could clean up masks, potentially.
+ return ERR(THREAD_NOT_ALIVE);
+ }
+ }
+
+ return gEventHandler.SetEvent(ArtJvmTiEnv::AsArtJvmTiEnv(env), art_thread, event_type, mode);
}
static jvmtiError GenerateEvents(jvmtiEnv* env, jvmtiEvent event_type) {
static void CreateArtJvmTiEnv(art::JavaVMExt* vm, /*out*/void** new_jvmtiEnv) {
struct ArtJvmTiEnv* env = new ArtJvmTiEnv(vm);
*new_jvmtiEnv = env;
+
+ gEventHandler.RegisterArtJvmTiEnv(env);
}
// A hook that the runtime uses to allow plugins to handle GetEnv calls. It returns true and
#ifndef ART_RUNTIME_OPENJDKJVMTI_ART_JVMTI_H_
#define ART_RUNTIME_OPENJDKJVMTI_ART_JVMTI_H_
+#include <memory>
+
#include <jni.h>
+#include "base/casts.h"
+#include "events.h"
#include "java_vm_ext.h"
#include "jni_env_ext.h"
#include "jvmti.h"
art::JavaVMExt* art_vm;
void* local_data;
+ EventMasks event_masks;
+ std::unique_ptr<jvmtiEventCallbacks> event_callbacks;
+
explicit ArtJvmTiEnv(art::JavaVMExt* runtime) : art_vm(runtime), local_data(nullptr) {
functions = &gJvmtiInterface;
}
+
+ static ArtJvmTiEnv* AsArtJvmTiEnv(jvmtiEnv* env) {
+ return art::down_cast<ArtJvmTiEnv*>(env);
+ }
};
// Macro and constexpr to make error values less annoying to write.
--- /dev/null
+/*
+ * Copyright (C) 2016 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.
+ */
+
+#ifndef ART_RUNTIME_OPENJDKJVMTI_EVENTS_INL_H_
+#define ART_RUNTIME_OPENJDKJVMTI_EVENTS_INL_H_
+
+#include "events.h"
+
+#include "art_jvmti.h"
+
+namespace openjdkjvmti {
+
+template <typename FnType>
+ALWAYS_INLINE static inline FnType* GetCallback(ArtJvmTiEnv* env, jvmtiEvent event) {
+ if (env->event_callbacks == nullptr) {
+ return nullptr;
+ }
+
+ switch (event) {
+ case JVMTI_EVENT_VM_INIT:
+ return reinterpret_cast<FnType*>(env->event_callbacks->VMInit);
+ case JVMTI_EVENT_VM_DEATH:
+ return reinterpret_cast<FnType*>(env->event_callbacks->VMDeath);
+ case JVMTI_EVENT_THREAD_START:
+ return reinterpret_cast<FnType*>(env->event_callbacks->ThreadStart);
+ case JVMTI_EVENT_THREAD_END:
+ return reinterpret_cast<FnType*>(env->event_callbacks->ThreadEnd);
+ case JVMTI_EVENT_CLASS_FILE_LOAD_HOOK:
+ return reinterpret_cast<FnType*>(env->event_callbacks->ClassFileLoadHook);
+ case JVMTI_EVENT_CLASS_LOAD:
+ return reinterpret_cast<FnType*>(env->event_callbacks->ClassLoad);
+ case JVMTI_EVENT_CLASS_PREPARE:
+ return reinterpret_cast<FnType*>(env->event_callbacks->ClassPrepare);
+ case JVMTI_EVENT_VM_START:
+ return reinterpret_cast<FnType*>(env->event_callbacks->VMStart);
+ case JVMTI_EVENT_EXCEPTION:
+ return reinterpret_cast<FnType*>(env->event_callbacks->Exception);
+ case JVMTI_EVENT_EXCEPTION_CATCH:
+ return reinterpret_cast<FnType*>(env->event_callbacks->ExceptionCatch);
+ case JVMTI_EVENT_SINGLE_STEP:
+ return reinterpret_cast<FnType*>(env->event_callbacks->SingleStep);
+ case JVMTI_EVENT_FRAME_POP:
+ return reinterpret_cast<FnType*>(env->event_callbacks->FramePop);
+ case JVMTI_EVENT_BREAKPOINT:
+ return reinterpret_cast<FnType*>(env->event_callbacks->Breakpoint);
+ case JVMTI_EVENT_FIELD_ACCESS:
+ return reinterpret_cast<FnType*>(env->event_callbacks->FieldAccess);
+ case JVMTI_EVENT_FIELD_MODIFICATION:
+ return reinterpret_cast<FnType*>(env->event_callbacks->FieldModification);
+ case JVMTI_EVENT_METHOD_ENTRY:
+ return reinterpret_cast<FnType*>(env->event_callbacks->MethodEntry);
+ case JVMTI_EVENT_METHOD_EXIT:
+ return reinterpret_cast<FnType*>(env->event_callbacks->MethodExit);
+ case JVMTI_EVENT_NATIVE_METHOD_BIND:
+ return reinterpret_cast<FnType*>(env->event_callbacks->NativeMethodBind);
+ case JVMTI_EVENT_COMPILED_METHOD_LOAD:
+ return reinterpret_cast<FnType*>(env->event_callbacks->CompiledMethodLoad);
+ case JVMTI_EVENT_COMPILED_METHOD_UNLOAD:
+ return reinterpret_cast<FnType*>(env->event_callbacks->CompiledMethodUnload);
+ case JVMTI_EVENT_DYNAMIC_CODE_GENERATED:
+ return reinterpret_cast<FnType*>(env->event_callbacks->DynamicCodeGenerated);
+ case JVMTI_EVENT_DATA_DUMP_REQUEST:
+ return reinterpret_cast<FnType*>(env->event_callbacks->DataDumpRequest);
+ case JVMTI_EVENT_MONITOR_WAIT:
+ return reinterpret_cast<FnType*>(env->event_callbacks->MonitorWait);
+ case JVMTI_EVENT_MONITOR_WAITED:
+ return reinterpret_cast<FnType*>(env->event_callbacks->MonitorWaited);
+ case JVMTI_EVENT_MONITOR_CONTENDED_ENTER:
+ return reinterpret_cast<FnType*>(env->event_callbacks->MonitorContendedEnter);
+ case JVMTI_EVENT_MONITOR_CONTENDED_ENTERED:
+ return reinterpret_cast<FnType*>(env->event_callbacks->MonitorContendedEntered);
+ case JVMTI_EVENT_RESOURCE_EXHAUSTED:
+ return reinterpret_cast<FnType*>(env->event_callbacks->ResourceExhausted);
+ case JVMTI_EVENT_GARBAGE_COLLECTION_START:
+ return reinterpret_cast<FnType*>(env->event_callbacks->GarbageCollectionStart);
+ case JVMTI_EVENT_GARBAGE_COLLECTION_FINISH:
+ return reinterpret_cast<FnType*>(env->event_callbacks->GarbageCollectionFinish);
+ case JVMTI_EVENT_OBJECT_FREE:
+ return reinterpret_cast<FnType*>(env->event_callbacks->ObjectFree);
+ case JVMTI_EVENT_VM_OBJECT_ALLOC:
+ return reinterpret_cast<FnType*>(env->event_callbacks->VMObjectAlloc);
+ }
+ return nullptr;
+}
+
+template <typename ...Args>
+inline void EventHandler::DispatchEvent(art::Thread* thread, jvmtiEvent event, Args... args) {
+ using FnType = void(jvmtiEnv*, Args...);
+ for (ArtJvmTiEnv* env : envs) {
+ bool dispatch = env->event_masks.global_event_mask.Test(event);
+
+ if (!dispatch && thread != nullptr && env->event_masks.unioned_thread_event_mask.Test(event)) {
+ EventMask* mask = env->event_masks.GetEventMaskOrNull(thread);
+ dispatch = mask != nullptr && mask->Test(event);
+ }
+
+ if (dispatch) {
+ FnType* callback = GetCallback<FnType>(env, event);
+ if (callback != nullptr) {
+ (*callback)(env, args...);
+ }
+ }
+ }
+}
+
+} // namespace openjdkjvmti
+
+#endif // ART_RUNTIME_OPENJDKJVMTI_EVENTS_INL_H_
--- /dev/null
+/* 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 "events.h"
+
+#include "art_jvmti.h"
+
+namespace openjdkjvmti {
+
+EventMask& EventMasks::GetEventMask(art::Thread* thread) {
+ if (thread == nullptr) {
+ return global_event_mask;
+ }
+
+ for (auto& pair : thread_event_masks) {
+ const UniqueThread& unique_thread = pair.first;
+ if (unique_thread.first == thread &&
+ unique_thread.second == static_cast<uint32_t>(thread->GetTid())) {
+ return pair.second;
+ }
+ }
+
+ // TODO: Remove old UniqueThread with the same pointer, if exists.
+
+ thread_event_masks.emplace_back(UniqueThread(thread, thread->GetTid()), EventMask());
+ return thread_event_masks.back().second;
+}
+
+EventMask* EventMasks::GetEventMaskOrNull(art::Thread* thread) {
+ if (thread == nullptr) {
+ return &global_event_mask;
+ }
+
+ for (auto& pair : thread_event_masks) {
+ const UniqueThread& unique_thread = pair.first;
+ if (unique_thread.first == thread &&
+ unique_thread.second == static_cast<uint32_t>(thread->GetTid())) {
+ return &pair.second;
+ }
+ }
+
+ return nullptr;
+}
+
+
+void EventMasks::EnableEvent(art::Thread* thread, jvmtiEvent event) {
+ DCHECK(EventMask::EventIsInRange(event));
+ GetEventMask(thread).Set(event);
+ if (thread != nullptr) {
+ unioned_thread_event_mask.Set(event, true);
+ }
+}
+
+void EventMasks::DisableEvent(art::Thread* thread, jvmtiEvent event) {
+ DCHECK(EventMask::EventIsInRange(event));
+ GetEventMask(thread).Set(event, false);
+ if (thread != nullptr) {
+ // Regenerate union for the event.
+ bool union_value = false;
+ for (auto& pair : thread_event_masks) {
+ union_value |= pair.second.Test(event);
+ if (union_value) {
+ break;
+ }
+ }
+ unioned_thread_event_mask.Set(event, union_value);
+ }
+}
+
+void EventHandler::RegisterArtJvmTiEnv(ArtJvmTiEnv* env) {
+ envs.push_back(env);
+}
+
+static bool IsThreadControllable(jvmtiEvent event) {
+ switch (event) {
+ case JVMTI_EVENT_VM_INIT:
+ case JVMTI_EVENT_VM_START:
+ case JVMTI_EVENT_VM_DEATH:
+ case JVMTI_EVENT_THREAD_START:
+ case JVMTI_EVENT_COMPILED_METHOD_LOAD:
+ case JVMTI_EVENT_COMPILED_METHOD_UNLOAD:
+ case JVMTI_EVENT_DYNAMIC_CODE_GENERATED:
+ case JVMTI_EVENT_DATA_DUMP_REQUEST:
+ return false;
+
+ default:
+ return true;
+ }
+}
+
+// Handle special work for the given event type, if necessary.
+static void HandleEventType(jvmtiEvent event ATTRIBUTE_UNUSED, bool enable ATTRIBUTE_UNUSED) {
+}
+
+jvmtiError EventHandler::SetEvent(ArtJvmTiEnv* env,
+ art::Thread* thread,
+ jvmtiEvent event,
+ jvmtiEventMode mode) {
+ if (thread != nullptr) {
+ art::ThreadState state = thread->GetState();
+ if (state == art::ThreadState::kStarting ||
+ state == art::ThreadState::kTerminated ||
+ thread->IsStillStarting()) {
+ return ERR(THREAD_NOT_ALIVE);
+ }
+ if (!IsThreadControllable(event)) {
+ return ERR(ILLEGAL_ARGUMENT);
+ }
+ }
+
+ // TODO: Capability check.
+
+ if (mode != JVMTI_ENABLE && mode != JVMTI_DISABLE) {
+ return ERR(ILLEGAL_ARGUMENT);
+ }
+
+ if (!EventMask::EventIsInRange(event)) {
+ return ERR(INVALID_EVENT_TYPE);
+ }
+
+ if (mode == JVMTI_ENABLE) {
+ env->event_masks.EnableEvent(thread, event);
+ global_mask.Set(event);
+ } else {
+ DCHECK_EQ(mode, JVMTI_DISABLE);
+
+ env->event_masks.DisableEvent(thread, event);
+
+ // Gotta recompute the global mask.
+ bool union_value = false;
+ for (const ArtJvmTiEnv* stored_env : envs) {
+ union_value |= stored_env->event_masks.global_event_mask.Test(event);
+ union_value |= stored_env->event_masks.unioned_thread_event_mask.Test(event);
+ if (union_value) {
+ break;
+ }
+ }
+ global_mask.Set(event, union_value);
+ }
+
+ // Handle any special work required for the event type.
+ HandleEventType(event, mode == JVMTI_ENABLE);
+
+ return ERR(NONE);
+}
+
+} // namespace openjdkjvmti
--- /dev/null
+/*
+ * Copyright (C) 2016 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.
+ */
+
+#ifndef ART_RUNTIME_OPENJDKJVMTI_EVENTS_H_
+#define ART_RUNTIME_OPENJDKJVMTI_EVENTS_H_
+
+#include <bitset>
+#include <vector>
+
+#include "base/logging.h"
+#include "jvmti.h"
+#include "thread.h"
+
+namespace openjdkjvmti {
+
+struct ArtJvmTiEnv;
+
+struct EventMask {
+ static constexpr size_t kEventsSize = JVMTI_MAX_EVENT_TYPE_VAL - JVMTI_MIN_EVENT_TYPE_VAL + 1;
+ std::bitset<kEventsSize> bit_set;
+
+ static bool EventIsInRange(jvmtiEvent event) {
+ return event >= JVMTI_MIN_EVENT_TYPE_VAL && event <= JVMTI_MAX_EVENT_TYPE_VAL;
+ }
+
+ void Set(jvmtiEvent event, bool value = true) {
+ DCHECK(EventIsInRange(event));
+ bit_set.set(event - JVMTI_MIN_EVENT_TYPE_VAL, value);
+ }
+
+ bool Test(jvmtiEvent event) const {
+ DCHECK(EventIsInRange(event));
+ return bit_set.test(event - JVMTI_MIN_EVENT_TYPE_VAL);
+ }
+};
+
+struct EventMasks {
+ // The globally enabled events.
+ EventMask global_event_mask;
+
+ // The per-thread enabled events.
+
+ // It is not enough to store a Thread pointer, as these may be reused. Use the pointer and the
+ // thread id.
+ // Note: We could just use the tid like tracing does.
+ using UniqueThread = std::pair<art::Thread*, uint32_t>;
+ // TODO: Native thread objects are immovable, so we can use them as keys in an (unordered) map,
+ // if necessary.
+ std::vector<std::pair<UniqueThread, EventMask>> thread_event_masks;
+
+ // A union of the per-thread events, for fast-pathing.
+ EventMask unioned_thread_event_mask;
+
+ EventMask& GetEventMask(art::Thread* thread);
+ EventMask* GetEventMaskOrNull(art::Thread* thread);
+ void EnableEvent(art::Thread* thread, jvmtiEvent event);
+ void DisableEvent(art::Thread* thread, jvmtiEvent event);
+};
+
+// Helper class for event handling.
+struct EventHandler {
+ // List of all JvmTiEnv objects that have been created, in their creation order.
+ std::vector<ArtJvmTiEnv*> envs;
+
+ // A union of all enabled events, anywhere.
+ EventMask global_mask;
+
+ // Register an env. It is assumed that this happens on env creation, that is, no events are
+ // enabled, yet.
+ void RegisterArtJvmTiEnv(ArtJvmTiEnv* env);
+
+ bool IsEventEnabledAnywhere(jvmtiEvent event) {
+ if (!EventMask::EventIsInRange(event)) {
+ return false;
+ }
+ return global_mask.Test(event);
+ }
+
+ jvmtiError SetEvent(ArtJvmTiEnv* env, art::Thread* thread, jvmtiEvent event, jvmtiEventMode mode);
+
+ template <typename ...Args>
+ ALWAYS_INLINE inline void DispatchEvent(art::Thread* thread, jvmtiEvent event, Args... args);
+};
+
+} // namespace openjdkjvmti
+
+#endif // ART_RUNTIME_OPENJDKJVMTI_EVENTS_H_
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