1 /*
2 * Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <jni.h>
27 #include <jvmti.h>
28 #include <aod.h>
29 #include <jvmti_aod.h>
30
31 extern "C" {
32
33 #define OBJECTS_FOR_ALLOCATION_TEST_CLASS_NAME "Lnsk/jvmti/AttachOnDemand/attach022/ClassForAllocationEventsTest;"
34
35 static jvmtiEnv* jvmti;
36 static Options* options = NULL;
37 static const char* agentName;
38
39 static jvmtiEvent testEvents[] = {JVMTI_EVENT_OBJECT_FREE, JVMTI_EVENT_VM_OBJECT_ALLOC};
40 static const int testEventsNumber = 2;
41
42 static volatile int taggedObjectsCounter = 0;
43 static volatile int freedObjectsCounter = 0;
44
45 static jrawMonitorID objectTagMonitor;
46 static jrawMonitorID objectFreeMonitor;
47
48 volatile int success = 1;
49
50 volatile int agentFinished;
51
52 void shutdownAgent(JNIEnv* jni) {
53 if (agentFinished)
54 return;
55
56 if (!nsk_jvmti_aod_disableEvents(jvmti, testEvents, testEventsNumber))
57 success = 0;
58
59 nsk_aod_agentFinished(jni, agentName, success);
60
61 agentFinished = 1;
62 }
63
64 JNIEXPORT jboolean JNICALL
65 Java_nsk_jvmti_AttachOnDemand_attach022_attach022Target_shutdownAgent(JNIEnv * jni,
66 jclass klass, jint expectedTaggedObjectsCounter) {
67
68 if (taggedObjectsCounter != expectedTaggedObjectsCounter) {
69 success = 0;
70 NSK_COMPLAIN2("ERROR: unexpected taggedObjectsCounter: %d (expected value is %d)\n", taggedObjectsCounter, expectedTaggedObjectsCounter);
71 }
72
73 if (taggedObjectsCounter != freedObjectsCounter) {
74 success = 0;
75 NSK_COMPLAIN2("ERROR: taggedObjectsCounter != freedObjectsCounter (taggedObjectsCounter: %d, freedObjectsCounter: %d)\n",
76 taggedObjectsCounter, freedObjectsCounter);
77 }
78
79 shutdownAgent(jni);
80
81 return success ? JNI_TRUE : JNI_FALSE;
82 }
83
84 void JNICALL objectFreeHandler(jvmtiEnv *jvmti, jlong tag) {
85 NSK_DISPLAY2("%s: ObjectFree event received (object tag: %ld)\n", agentName, tag);
86
87 if (NSK_JVMTI_VERIFY(jvmti->RawMonitorEnter(objectFreeMonitor))) {
88 freedObjectsCounter++;
89
90 if (!NSK_JVMTI_VERIFY(jvmti->RawMonitorExit(objectFreeMonitor))) {
91 success = 0;
92 }
93 } else {
94 success = 0;
95 }
96 }
97
98 #define ATTACH022_TARGET_APP_CLASS_NAME "nsk/jvmti/AttachOnDemand/attach022/attach022Target"
99
100 int registerNativeMethods(JNIEnv* jni) {
101 jclass appClass;
102 JNINativeMethod nativeMethods[] = {
103 {(char*)"shutdownAgent", (char*)"(I)Z",
104 (void*) Java_nsk_jvmti_AttachOnDemand_attach022_attach022Target_shutdownAgent}};
105 jint nativeMethodsNumber = 1;
106
107 if (!NSK_JNI_VERIFY(jni, (appClass =
108 jni->FindClass(ATTACH022_TARGET_APP_CLASS_NAME)) != NULL)) {
109 return NSK_FALSE;
110 }
111
112 if (!NSK_JNI_VERIFY(jni,
113 (jni->RegisterNatives(appClass, nativeMethods, nativeMethodsNumber) == 0))) {
114 return NSK_FALSE;
115 }
116
117 return NSK_TRUE;
118 }
119
120 void JNICALL vmObjectAllocHandler(jvmtiEnv * jvmti,
121 JNIEnv * jni,
122 jthread thread,
123 jobject object,
124 jclass object_class,
125 jlong size) {
126 char className[MAX_STRING_LENGTH];
127
128 if (!nsk_jvmti_aod_getClassName(jvmti, object_class, className)) {
129 success = 0;
130 shutdownAgent(jni);
131 return;
132 }
133
134 NSK_DISPLAY2("%s: ObjectAlloc event received (object class: %s)\n", agentName, className);
135
136 if (!strcmp(className, OBJECTS_FOR_ALLOCATION_TEST_CLASS_NAME)) {
137 if (NSK_JVMTI_VERIFY(jvmti->RawMonitorEnter(objectTagMonitor))) {
138 jlong tagValue = taggedObjectsCounter + 1;
139
140 if (!NSK_JVMTI_VERIFY(jvmti->SetTag(object, tagValue))) {
141 NSK_COMPLAIN1("%s: failed to set tag\n", agentName);
142 success = 0;
143 } else {
144 NSK_DISPLAY2("%s: object was tagged (tag value: %ld)\n", agentName, tagValue);
145 taggedObjectsCounter++;
146 }
147
148 if (!NSK_JVMTI_VERIFY(jvmti->RawMonitorExit(objectTagMonitor))) {
149 success = 0;
150 }
151 } else {
152 success = 0;
153 }
154 }
155
156 if (!success) {
157 NSK_COMPLAIN1("%s: error happened during agent work, stop agent\n", agentName);
158 shutdownAgent(jni);
159 }
160 }
161
162 #ifdef STATIC_BUILD
163 JNIEXPORT jint JNI_OnLoad_attach022Agent00(JavaVM *jvm, char *options, void *reserved) {
164 return JNI_VERSION_1_8;
165 }
166 #endif
167
168 JNIEXPORT jint JNICALL
169 #ifdef STATIC_BUILD
170 Agent_OnAttach_attach022Agent00(JavaVM *vm, char *optionsString, void *reserved)
171 #else
172 Agent_OnAttach(JavaVM *vm, char *optionsString, void *reserved)
173 #endif
174 {
175 jvmtiEventCallbacks eventCallbacks;
176 jvmtiCapabilities caps;
177 JNIEnv* jni;
178
179 if (!NSK_VERIFY((options = (Options*) nsk_aod_createOptions(optionsString)) != NULL))
180 return JNI_ERR;
181
182 agentName = nsk_aod_getOptionValue(options, NSK_AOD_AGENT_NAME_OPTION);
183
184 if ((jni = (JNIEnv*) nsk_aod_createJNIEnv(vm)) == NULL)
185 return JNI_ERR;
186
187 if (!NSK_VERIFY((jvmti = nsk_jvmti_createJVMTIEnv(vm, reserved)) != NULL))
188 return JNI_ERR;
189
190 if (!NSK_VERIFY(registerNativeMethods(jni))) {
191 return JNI_ERR;
192 }
193
194 if (!NSK_JVMTI_VERIFY(jvmti->CreateRawMonitor("ObjectTagMonitor", &objectTagMonitor))) {
195 return JNI_ERR;
196 }
197
198 if (!NSK_JVMTI_VERIFY(jvmti->CreateRawMonitor("ObjectFreeMonitor", &objectFreeMonitor))) {
199 return JNI_ERR;
200 }
201
202 memset(&caps, 0, sizeof(caps));
203 caps.can_tag_objects = 1;
204 caps.can_generate_object_free_events = 1;
205 caps.can_generate_vm_object_alloc_events = 1;
206 if (!NSK_JVMTI_VERIFY(jvmti->AddCapabilities(&caps))) {
207 return JNI_ERR;
208 }
209
210 memset(&eventCallbacks,0, sizeof(eventCallbacks));
211 eventCallbacks.ObjectFree = objectFreeHandler;
212 eventCallbacks.VMObjectAlloc = vmObjectAllocHandler;
213 if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&eventCallbacks, sizeof(eventCallbacks)))) {
214 return JNI_ERR;
215 }
216
217 if (!(nsk_jvmti_aod_enableEvents(jvmti, testEvents, testEventsNumber))) {
218 return JNI_ERR;
219 }
220
221 NSK_DISPLAY1("%s: initialization was done\n", agentName);
222
223 if (!NSK_VERIFY(nsk_aod_agentLoaded(jni, agentName)))
224 return JNI_ERR;
225
226 return JNI_OK;
227 }
228
229 }