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 /*
34 * In this test the same agent library is attached 3 times, but with
35 * different options. In such scenario functions nsk_jvmti_aod_addMultiagentsOptions and
36 * nsk_jvmti_aod_getMultiagentsOptions are used.
37 *
38 * Each agent from ClassLoad event handler tries to redefine class ClassToRedefine and
39 * finishes work.
40 */
41
42 #define REDEFINED_CLASS_NAME "Lnsk/jvmti/AttachOnDemand/attach046/ClassToRedefine;"
43 #define REDEFINED_CLASS_FILE_NAME "nsk/jvmti/AttachOnDemand/attach046/ClassToRedefine"
44
45 void JNICALL classLoadHandler(
46 jvmtiEnv *jvmti,
47 JNIEnv* jni,
48 jthread thread,
49 jclass klass) {
50 char className[MAX_STRING_LENGTH];
51 const char* agentName;
52 Options* options;
53
54 options = nsk_jvmti_aod_getMultiagentsOptions(jvmti);
55 if (!NSK_VERIFY(options != NULL)) {
56 NSK_COMPLAIN0("Failed to get agents's options\n");
57 nsk_jvmti_aod_disableEvent(jvmti, JVMTI_EVENT_CLASS_LOAD);
58 // can't call nsk_aod_agentFinished because of without options can't get agent's name
59 return;
60 }
61
62 agentName = nsk_aod_getOptionValue(options, NSK_AOD_AGENT_NAME_OPTION);
63
64 if (!nsk_jvmti_aod_getClassName(jvmti, klass, className)) {
65 nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_CLASS_LOAD, 0, jvmti, jni);
66 return;
67 }
68
69 NSK_DISPLAY2("%s: ClassLoad event was received for class '%s'\n", agentName, className);
70
71 if (!strcmp(className, REDEFINED_CLASS_NAME)) {
72
73 NSK_DISPLAY1("%s: redefining class\n", agentName);
74
75 if (!NSK_VERIFY(nsk_jvmti_aod_redefineClass(options, jvmti, klass, REDEFINED_CLASS_FILE_NAME))) {
76 NSK_COMPLAIN1("%s: failed to redefine class\n", agentName);
77 nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_CLASS_LOAD, 0, jvmti, jni);
78 } else {
79 nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_CLASS_LOAD, 1, jvmti, jni);
80 }
81 }
82 }
83
84 #ifdef STATIC_BUILD
85 JNIEXPORT jint JNI_OnLoad_attach046Agent00(JavaVM *jvm, char *options, void *reserved) {
86 return JNI_VERSION_1_8;
87 }
88 #endif
89
90 JNIEXPORT jint JNICALL
91 #ifdef STATIC_BUILD
92 Agent_OnAttach_attach046Agent00(JavaVM *vm, char *optionsString, void *reserved)
93 #else
94 Agent_OnAttach(JavaVM *vm, char *optionsString, void *reserved)
95 #endif
96 {
97 jvmtiEventCallbacks eventCallbacks;
98 jvmtiCapabilities caps;
99 jvmtiEnv* jvmti = NULL;
100 JNIEnv* jni = NULL;
101 Options* options;
102 const char* agentName;
103
104 options = (Options*) nsk_aod_createOptions(optionsString);
105 if (!NSK_VERIFY(options != NULL))
106 return JNI_ERR;
107
108 agentName = nsk_aod_getOptionValue(options, NSK_AOD_AGENT_NAME_OPTION);
109
110 jni = (JNIEnv*) nsk_aod_createJNIEnv(vm);
111 if (jni == NULL)
112 return NSK_FALSE;
113
114 jvmti = nsk_jvmti_createJVMTIEnv(vm, reserved);
115 if (!NSK_VERIFY(jvmti != NULL))
116 return JNI_ERR;
117
118 memset(&caps, 0, sizeof(caps));
119 caps.can_redefine_classes = 1;
120 if (!NSK_JVMTI_VERIFY(jvmti->AddCapabilities(&caps))) {
121 return JNI_ERR;
122 }
123
124 memset(&eventCallbacks,0, sizeof(eventCallbacks));
125 eventCallbacks.ClassLoad = classLoadHandler;
126 if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&eventCallbacks, sizeof(eventCallbacks)))) {
127 return JNI_ERR;
128 }
129
130 if (!(nsk_jvmti_aod_enableEvent(jvmti, JVMTI_EVENT_CLASS_LOAD))) {
131 return JNI_ERR;
132 }
133
134 if (!NSK_VERIFY(nsk_jvmti_aod_addMultiagentsOptions(jvmti, options))) {
135 return JNI_ERR;
136 }
137
138 NSK_DISPLAY1("%s: initialization was done\n", agentName);
139
140 if (!NSK_VERIFY(nsk_aod_agentLoaded(jni, agentName)))
141 return JNI_ERR;
142
143 return JNI_OK;
144 }
145
146 }