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/*
* Copyright (C) 2013 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 <pthread.h>
#include <cstdio>
#include <iostream>
#include <mutex>
#include <vector>
#include "android-base/logging.h"
#include "android-base/stringprintf.h"
#include "jni.h"
#include "jvmti.h"
#include "scoped_local_ref.h"
#include "scoped_utf_chars.h"
// Test infrastructure
#include "jvmti_helper.h"
#include "test_env.h"
namespace art {
namespace Test904ObjectAllocation {
static JavaVM* vm;
static std::string GetClassName(JNIEnv* jni_env, jclass cls) {
ScopedLocalRef<jclass> class_class(jni_env, jni_env->GetObjectClass(cls));
jmethodID mid = jni_env->GetMethodID(class_class.get(), "getName", "()Ljava/lang/String;");
ScopedLocalRef<jstring> str(
jni_env, reinterpret_cast<jstring>(jni_env->CallObjectMethod(cls, mid)));
ScopedUtfChars utf_chars(jni_env, str.get());
return utf_chars.c_str();
}
template <typename T>
class ScopedGlobalRef {
public:
ScopedGlobalRef(JNIEnv* env, T obj) : obj_(env->NewGlobalRef(obj)) {}
ScopedGlobalRef(const ScopedGlobalRef<T>& src) noexcept
: obj_(GetEnv()->NewGlobalRef(src.obj_)) {}
ScopedGlobalRef(ScopedGlobalRef<T>&& src) noexcept : obj_(src.obj_) {
src.obj_ = nullptr;
}
~ScopedGlobalRef() {
GetEnv()->DeleteGlobalRef(obj_);
}
T Get(JNIEnv* env) const {
return reinterpret_cast<T>(env->NewLocalRef(obj_));
}
private:
JNIEnv* GetEnv() const {
JNIEnv* env = nullptr;
CHECK_EQ(vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6), 0);
return env;
}
jobject obj_;
};
struct EventLog {
ScopedGlobalRef<jclass> object_klass;
ScopedGlobalRef<jclass> object_klass2;
jlong size;
ScopedGlobalRef<jthread> thr_;
};
static std::mutex gEventsMutex;
static std::vector<EventLog> gEvents;
static void JNICALL ObjectAllocated(jvmtiEnv* ti_env ATTRIBUTE_UNUSED,
JNIEnv* jni_env,
jthread thread,
jobject object,
jclass object_klass,
jlong size) {
ScopedLocalRef<jclass> object_klass2(jni_env, jni_env->GetObjectClass(object));
std::lock_guard<std::mutex> guard(gEventsMutex);
gEvents.push_back({ScopedGlobalRef<jclass>(jni_env, object_klass),
ScopedGlobalRef<jclass>(jni_env, object_klass2.get()),
size,
ScopedGlobalRef<jthread>(jni_env, thread)});
}
extern "C" JNIEXPORT void JNICALL Java_art_Test904_setupObjectAllocCallback(
JNIEnv* env, jclass klass ATTRIBUTE_UNUSED, jboolean enable) {
env->GetJavaVM(&vm);
jvmtiEventCallbacks callbacks;
memset(&callbacks, 0, sizeof(jvmtiEventCallbacks));
callbacks.VMObjectAlloc = enable ? ObjectAllocated : nullptr;
jvmtiError ret = jvmti_env->SetEventCallbacks(&callbacks, sizeof(callbacks));
JvmtiErrorToException(env, jvmti_env, ret);
}
extern "C" JNIEXPORT void JNICALL Java_art_Test904_enableAllocationTracking(
JNIEnv* env, jclass, jthread thread, jboolean enable) {
jvmtiError ret = jvmti_env->SetEventNotificationMode(
enable ? JVMTI_ENABLE : JVMTI_DISABLE,
JVMTI_EVENT_VM_OBJECT_ALLOC,
thread);
JvmtiErrorToException(env, jvmti_env, ret);
}
extern "C" JNIEXPORT jobjectArray JNICALL Java_art_Test904_getTrackingEventMessages(
JNIEnv* env, jclass Main_klass ATTRIBUTE_UNUSED, jobjectArray threads) {
std::lock_guard<std::mutex> guard(gEventsMutex);
std::vector<std::string> real_events;
std::vector<jthread> thread_lst;
jint nthreads = env->GetArrayLength(threads);
{
env->PushLocalFrame(nthreads + 1);
for (jint i = 0; i < nthreads; i++) {
thread_lst.push_back(reinterpret_cast<jthread>(env->GetObjectArrayElement(threads, i)));
}
for (const EventLog& ev : gEvents) {
ScopedLocalRef<jthread> thr(env, ev.thr_.Get(env));
for (jthread req_thread : thread_lst) {
if (env->IsSameObject(req_thread, thr.get())) {
ScopedLocalRef<jclass> klass(env, ev.object_klass.Get(env));
ScopedLocalRef<jclass> klass2(env, ev.object_klass2.Get(env));
std::string object_klass_descriptor = GetClassName(env, klass.get());
std::string object_klass_descriptor2 = GetClassName(env, klass2.get());
std::string res(android::base::StringPrintf("ObjectAllocated type %s/%s size %zu",
object_klass_descriptor.c_str(),
object_klass_descriptor2.c_str(),
static_cast<size_t>(ev.size)));
real_events.push_back(res);
break;
}
}
}
env->PopLocalFrame(nullptr);
}
jobjectArray ret = CreateObjectArray(env,
static_cast<jint>(real_events.size()),
"java/lang/String",
[&](jint i) {
return env->NewStringUTF(real_events[i].c_str());
});
gEvents.clear();
return ret;
}
} // namespace Test904ObjectAllocation
} // namespace art
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