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/*
* Copyright (C) 2017 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 "jni.h"
#include "jvmti.h"
#include <vector>
#include "jvmti_helper.h"
#include "jni_helper.h"
#include "test_env.h"
#include "scoped_local_ref.h"
namespace art {
namespace common_monitors {
extern "C" JNIEXPORT jobject JNICALL Java_art_Monitors_getCurrentContendedMonitor(
JNIEnv* env, jclass, jthread thr) {
jobject out = nullptr;
JvmtiErrorToException(env, jvmti_env, jvmti_env->GetCurrentContendedMonitor(thr, &out));
return out;
}
extern "C" JNIEXPORT jobject JNICALL Java_art_Monitors_getObjectMonitorUsage(
JNIEnv* env, jclass, jobject obj) {
ScopedLocalRef<jclass> klass(env, env->FindClass("art/Monitors$MonitorUsage"));
if (env->ExceptionCheck()) {
return nullptr;
}
jmethodID constructor = env->GetMethodID(
klass.get(),
"<init>",
"(Ljava/lang/Object;Ljava/lang/Thread;I[Ljava/lang/Thread;[Ljava/lang/Thread;)V");
if (env->ExceptionCheck()) {
return nullptr;
}
jvmtiMonitorUsage usage;
if (JvmtiErrorToException(env, jvmti_env, jvmti_env->GetObjectMonitorUsage(obj, &usage))) {
return nullptr;
}
jobjectArray wait = CreateObjectArray(env, usage.waiter_count, "java/lang/Thread",
[&](jint i) { return usage.waiters[i]; });
if (env->ExceptionCheck()) {
jvmti_env->Deallocate(reinterpret_cast<unsigned char*>(usage.waiters));
jvmti_env->Deallocate(reinterpret_cast<unsigned char*>(usage.notify_waiters));
return nullptr;
}
jobjectArray notify_wait = CreateObjectArray(env, usage.notify_waiter_count, "java/lang/Thread",
[&](jint i) { return usage.notify_waiters[i]; });
if (env->ExceptionCheck()) {
jvmti_env->Deallocate(reinterpret_cast<unsigned char*>(usage.waiters));
jvmti_env->Deallocate(reinterpret_cast<unsigned char*>(usage.notify_waiters));
return nullptr;
}
return env->NewObject(klass.get(), constructor,
obj, usage.owner, usage.entry_count, wait, notify_wait);
}
struct MonitorsData {
jclass test_klass;
jmethodID monitor_enter;
jmethodID monitor_entered;
jmethodID monitor_wait;
jmethodID monitor_waited;
jclass monitor_klass;
};
static void monitorEnterCB(jvmtiEnv* jvmti,
JNIEnv* jnienv,
jthread thr,
jobject obj) {
MonitorsData* data = nullptr;
if (JvmtiErrorToException(jnienv, jvmti,
jvmti->GetEnvironmentLocalStorage(reinterpret_cast<void**>(&data)))) {
return;
}
if (!jnienv->IsInstanceOf(obj, data->monitor_klass)) {
return;
}
jnienv->CallStaticVoidMethod(data->test_klass, data->monitor_enter, thr, obj);
}
static void monitorEnteredCB(jvmtiEnv* jvmti,
JNIEnv* jnienv,
jthread thr,
jobject obj) {
MonitorsData* data = nullptr;
if (JvmtiErrorToException(jnienv, jvmti,
jvmti->GetEnvironmentLocalStorage(reinterpret_cast<void**>(&data)))) {
return;
}
if (!jnienv->IsInstanceOf(obj, data->monitor_klass)) {
return;
}
jnienv->CallStaticVoidMethod(data->test_klass, data->monitor_entered, thr, obj);
}
static void monitorWaitCB(jvmtiEnv* jvmti,
JNIEnv* jnienv,
jthread thr,
jobject obj,
jlong timeout) {
MonitorsData* data = nullptr;
if (JvmtiErrorToException(jnienv, jvmti,
jvmti->GetEnvironmentLocalStorage(reinterpret_cast<void**>(&data)))) {
return;
}
if (!jnienv->IsInstanceOf(obj, data->monitor_klass)) {
return;
}
jnienv->CallStaticVoidMethod(data->test_klass, data->monitor_wait, thr, obj, timeout);
}
static void monitorWaitedCB(jvmtiEnv* jvmti,
JNIEnv* jnienv,
jthread thr,
jobject obj,
jboolean timed_out) {
MonitorsData* data = nullptr;
if (JvmtiErrorToException(jnienv, jvmti,
jvmti->GetEnvironmentLocalStorage(reinterpret_cast<void**>(&data)))) {
return;
}
if (!jnienv->IsInstanceOf(obj, data->monitor_klass)) {
return;
}
jnienv->CallStaticVoidMethod(data->test_klass, data->monitor_waited, thr, obj, timed_out);
}
extern "C" JNIEXPORT void JNICALL Java_art_Monitors_setupMonitorEvents(
JNIEnv* env,
jclass,
jclass test_klass,
jobject monitor_enter,
jobject monitor_entered,
jobject monitor_wait,
jobject monitor_waited,
jclass monitor_klass,
jthread thr) {
MonitorsData* data = nullptr;
if (JvmtiErrorToException(env,
jvmti_env,
jvmti_env->Allocate(sizeof(MonitorsData),
reinterpret_cast<unsigned char**>(&data)))) {
return;
}
jvmtiCapabilities caps;
memset(&caps, 0, sizeof(caps));
caps.can_generate_monitor_events = 1;
if (JvmtiErrorToException(env, jvmti_env, jvmti_env->AddCapabilities(&caps))) {
return;
}
memset(data, 0, sizeof(MonitorsData));
data->test_klass = reinterpret_cast<jclass>(env->NewGlobalRef(test_klass));
data->monitor_enter = env->FromReflectedMethod(monitor_enter);
data->monitor_entered = env->FromReflectedMethod(monitor_entered);
data->monitor_wait = env->FromReflectedMethod(monitor_wait);
data->monitor_waited = env->FromReflectedMethod(monitor_waited);
data->monitor_klass = reinterpret_cast<jclass>(env->NewGlobalRef(monitor_klass));
MonitorsData* old_data = nullptr;
if (JvmtiErrorToException(env, jvmti_env,
jvmti_env->GetEnvironmentLocalStorage(
reinterpret_cast<void**>(&old_data)))) {
return;
} else if (old_data != nullptr && old_data->test_klass != nullptr) {
ScopedLocalRef<jclass> rt_exception(env, env->FindClass("java/lang/RuntimeException"));
env->ThrowNew(rt_exception.get(), "Environment already has local storage set!");
return;
}
if (JvmtiErrorToException(env, jvmti_env, jvmti_env->SetEnvironmentLocalStorage(data))) {
return;
}
current_callbacks.MonitorContendedEnter = monitorEnterCB;
current_callbacks.MonitorContendedEntered = monitorEnteredCB;
current_callbacks.MonitorWait = monitorWaitCB;
current_callbacks.MonitorWaited = monitorWaitedCB;
if (JvmtiErrorToException(env,
jvmti_env,
jvmti_env->SetEventCallbacks(¤t_callbacks,
sizeof(current_callbacks)))) {
return;
}
if (JvmtiErrorToException(env,
jvmti_env,
jvmti_env->SetEventNotificationMode(
JVMTI_ENABLE, JVMTI_EVENT_MONITOR_CONTENDED_ENTER, thr))) {
return;
}
if (JvmtiErrorToException(env,
jvmti_env,
jvmti_env->SetEventNotificationMode(
JVMTI_ENABLE, JVMTI_EVENT_MONITOR_CONTENDED_ENTERED, thr))) {
return;
}
if (JvmtiErrorToException(env,
jvmti_env,
jvmti_env->SetEventNotificationMode(
JVMTI_ENABLE, JVMTI_EVENT_MONITOR_WAIT, thr))) {
return;
}
if (JvmtiErrorToException(env,
jvmti_env,
jvmti_env->SetEventNotificationMode(
JVMTI_ENABLE, JVMTI_EVENT_MONITOR_WAITED, thr))) {
return;
}
}
} // namespace common_monitors
} // namespace art
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