1 /*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <pthread.h>
18
19 #include <cstdio>
20 #include <iostream>
21 #include <mutex>
22 #include <vector>
23
24 #include "android-base/logging.h"
25 #include "android-base/stringprintf.h"
26 #include "jni.h"
27 #include "jvmti.h"
28 #include "scoped_local_ref.h"
29 #include "scoped_utf_chars.h"
30
31 // Test infrastructure
32 #include "jvmti_helper.h"
33 #include "test_env.h"
34
35 namespace art {
36 namespace Test904ObjectAllocation {
37
38 static JavaVM* vm;
39
GetClassName(JNIEnv * jni_env,jclass cls)40 static std::string GetClassName(JNIEnv* jni_env, jclass cls) {
41 ScopedLocalRef<jclass> class_class(jni_env, jni_env->GetObjectClass(cls));
42 jmethodID mid = jni_env->GetMethodID(class_class.get(), "getName", "()Ljava/lang/String;");
43 ScopedLocalRef<jstring> str(
44 jni_env, reinterpret_cast<jstring>(jni_env->CallObjectMethod(cls, mid)));
45 ScopedUtfChars utf_chars(jni_env, str.get());
46 return utf_chars.c_str();
47 }
48
49 template <typename T>
50 class ScopedGlobalRef {
51 public:
ScopedGlobalRef(JNIEnv * env,T obj)52 ScopedGlobalRef(JNIEnv* env, T obj) : obj_(env->NewGlobalRef(obj)) {}
ScopedGlobalRef(const ScopedGlobalRef<T> & src)53 ScopedGlobalRef(const ScopedGlobalRef<T>& src) noexcept
54 : obj_(GetEnv()->NewGlobalRef(src.obj_)) {}
ScopedGlobalRef(ScopedGlobalRef<T> && src)55 ScopedGlobalRef(ScopedGlobalRef<T>&& src) noexcept : obj_(src.obj_) {
56 src.obj_ = nullptr;
57 }
58
~ScopedGlobalRef()59 ~ScopedGlobalRef() {
60 GetEnv()->DeleteGlobalRef(obj_);
61 }
62
Get(JNIEnv * env) const63 T Get(JNIEnv* env) const {
64 return reinterpret_cast<T>(env->NewLocalRef(obj_));
65 }
66
67 private:
GetEnv() const68 JNIEnv* GetEnv() const {
69 JNIEnv* env = nullptr;
70 CHECK_EQ(vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6), 0);
71 return env;
72 }
73
74 jobject obj_;
75 };
76
77 struct EventLog {
78 ScopedGlobalRef<jclass> object_klass;
79 ScopedGlobalRef<jclass> object_klass2;
80 jlong size;
81 ScopedGlobalRef<jthread> thr_;
82 };
83
84 static std::mutex gEventsMutex;
85 static std::vector<EventLog> gEvents;
86
ObjectAllocated(jvmtiEnv * ti_env ATTRIBUTE_UNUSED,JNIEnv * jni_env,jthread thread,jobject object,jclass object_klass,jlong size)87 static void JNICALL ObjectAllocated(jvmtiEnv* ti_env ATTRIBUTE_UNUSED,
88 JNIEnv* jni_env,
89 jthread thread,
90 jobject object,
91 jclass object_klass,
92 jlong size) {
93 ScopedLocalRef<jclass> object_klass2(jni_env, jni_env->GetObjectClass(object));
94 std::lock_guard<std::mutex> guard(gEventsMutex);
95 gEvents.push_back({ScopedGlobalRef<jclass>(jni_env, object_klass),
96 ScopedGlobalRef<jclass>(jni_env, object_klass2.get()),
97 size,
98 ScopedGlobalRef<jthread>(jni_env, thread)});
99 }
100
Java_art_Test904_setupObjectAllocCallback(JNIEnv * env,jclass klass ATTRIBUTE_UNUSED,jboolean enable)101 extern "C" JNIEXPORT void JNICALL Java_art_Test904_setupObjectAllocCallback(
102 JNIEnv* env, jclass klass ATTRIBUTE_UNUSED, jboolean enable) {
103 env->GetJavaVM(&vm);
104 jvmtiEventCallbacks callbacks;
105 memset(&callbacks, 0, sizeof(jvmtiEventCallbacks));
106 callbacks.VMObjectAlloc = enable ? ObjectAllocated : nullptr;
107
108 jvmtiError ret = jvmti_env->SetEventCallbacks(&callbacks, sizeof(callbacks));
109 JvmtiErrorToException(env, jvmti_env, ret);
110 }
111
Java_art_Test904_enableAllocationTracking(JNIEnv * env,jclass,jthread thread,jboolean enable)112 extern "C" JNIEXPORT void JNICALL Java_art_Test904_enableAllocationTracking(
113 JNIEnv* env, jclass, jthread thread, jboolean enable) {
114 jvmtiError ret = jvmti_env->SetEventNotificationMode(
115 enable ? JVMTI_ENABLE : JVMTI_DISABLE,
116 JVMTI_EVENT_VM_OBJECT_ALLOC,
117 thread);
118 JvmtiErrorToException(env, jvmti_env, ret);
119 }
120
Java_art_Test904_getTrackingEventMessages(JNIEnv * env,jclass Main_klass ATTRIBUTE_UNUSED,jobjectArray threads)121 extern "C" JNIEXPORT jobjectArray JNICALL Java_art_Test904_getTrackingEventMessages(
122 JNIEnv* env, jclass Main_klass ATTRIBUTE_UNUSED, jobjectArray threads) {
123 std::lock_guard<std::mutex> guard(gEventsMutex);
124 std::vector<std::string> real_events;
125 std::vector<jthread> thread_lst;
126 jint nthreads = env->GetArrayLength(threads);
127 {
128 env->PushLocalFrame(nthreads + 1);
129 for (jint i = 0; i < nthreads; i++) {
130 thread_lst.push_back(reinterpret_cast<jthread>(env->GetObjectArrayElement(threads, i)));
131 }
132 for (const EventLog& ev : gEvents) {
133 ScopedLocalRef<jthread> thr(env, ev.thr_.Get(env));
134 for (jthread req_thread : thread_lst) {
135 if (env->IsSameObject(req_thread, thr.get())) {
136 ScopedLocalRef<jclass> klass(env, ev.object_klass.Get(env));
137 ScopedLocalRef<jclass> klass2(env, ev.object_klass2.Get(env));
138 std::string object_klass_descriptor = GetClassName(env, klass.get());
139 std::string object_klass_descriptor2 = GetClassName(env, klass2.get());
140 std::string res(android::base::StringPrintf("ObjectAllocated type %s/%s size %zu",
141 object_klass_descriptor.c_str(),
142 object_klass_descriptor2.c_str(),
143 static_cast<size_t>(ev.size)));
144 real_events.push_back(res);
145 break;
146 }
147 }
148 }
149 env->PopLocalFrame(nullptr);
150 }
151 jobjectArray ret = CreateObjectArray(env,
152 static_cast<jint>(real_events.size()),
153 "java/lang/String",
154 [&](jint i) {
155 return env->NewStringUTF(real_events[i].c_str());
156 });
157 gEvents.clear();
158 return ret;
159 }
160
161 } // namespace Test904ObjectAllocation
162 } // namespace art
163