1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/*
* Copyright (c) 2007, 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <jni.h>
#include <jvmti.h>
#include <aod.hpp>
#include <jvmti_aod.hpp>
extern "C" {
/*
* In this test the same agent library is attached 3 times, but with
* different options. In such scenario functions nsk_jvmti_aod_addMultiagentsOptions and
* nsk_jvmti_aod_getMultiagentsOptions are used.
*
* Each agent from ClassLoad event handler tries to redefine class ClassToRedefine and
* finishes work.
*/
#define REDEFINED_CLASS_NAME "Lnsk/jvmti/AttachOnDemand/attach046/ClassToRedefine;"
#define REDEFINED_CLASS_FILE_NAME "nsk/jvmti/AttachOnDemand/attach046/ClassToRedefine"
void JNICALL classLoadHandler(
jvmtiEnv *jvmti,
JNIEnv* jni,
jthread thread,
jclass klass) {
char className[MAX_STRING_LENGTH];
const char* agentName;
Options* options;
options = nsk_jvmti_aod_getMultiagentsOptions(jvmti);
if (!NSK_VERIFY(options != nullptr)) {
NSK_COMPLAIN0("Failed to get agents's options\n");
nsk_jvmti_aod_disableEvent(jvmti, JVMTI_EVENT_CLASS_LOAD);
// can't call nsk_aod_agentFinished because of without options can't get agent's name
return;
}
agentName = nsk_aod_getOptionValue(options, NSK_AOD_AGENT_NAME_OPTION);
if (!nsk_jvmti_aod_getClassName(jvmti, klass, className)) {
nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_CLASS_LOAD, 0, jvmti, jni);
return;
}
NSK_DISPLAY2("%s: ClassLoad event was received for class '%s'\n", agentName, className);
if (!strcmp(className, REDEFINED_CLASS_NAME)) {
NSK_DISPLAY1("%s: redefining class\n", agentName);
if (!NSK_VERIFY(nsk_jvmti_aod_redefineClass(options, jvmti, klass, REDEFINED_CLASS_FILE_NAME))) {
NSK_COMPLAIN1("%s: failed to redefine class\n", agentName);
nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_CLASS_LOAD, 0, jvmti, jni);
} else {
nsk_jvmti_aod_disableEventAndFinish(agentName, JVMTI_EVENT_CLASS_LOAD, 1, jvmti, jni);
}
}
}
#ifdef STATIC_BUILD
JNIEXPORT jint JNI_OnLoad_attach046Agent00(JavaVM *jvm, char *options, void *reserved) {
return JNI_VERSION_1_8;
}
#endif
JNIEXPORT jint JNICALL
#ifdef STATIC_BUILD
Agent_OnAttach_attach046Agent00(JavaVM *vm, char *optionsString, void *reserved)
#else
Agent_OnAttach(JavaVM *vm, char *optionsString, void *reserved)
#endif
{
jvmtiEventCallbacks eventCallbacks;
jvmtiCapabilities caps;
jvmtiEnv* jvmti = nullptr;
JNIEnv* jni = nullptr;
Options* options;
const char* agentName;
options = (Options*) nsk_aod_createOptions(optionsString);
if (!NSK_VERIFY(options != nullptr))
return JNI_ERR;
agentName = nsk_aod_getOptionValue(options, NSK_AOD_AGENT_NAME_OPTION);
jni = (JNIEnv*) nsk_aod_createJNIEnv(vm);
if (jni == nullptr)
return NSK_FALSE;
jvmti = nsk_jvmti_createJVMTIEnv(vm, reserved);
if (!NSK_VERIFY(jvmti != nullptr))
return JNI_ERR;
memset(&caps, 0, sizeof(caps));
caps.can_redefine_classes = 1;
if (!NSK_JVMTI_VERIFY(jvmti->AddCapabilities(&caps))) {
return JNI_ERR;
}
memset(&eventCallbacks,0, sizeof(eventCallbacks));
eventCallbacks.ClassLoad = classLoadHandler;
if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&eventCallbacks, sizeof(eventCallbacks)))) {
return JNI_ERR;
}
if (!(nsk_jvmti_aod_enableEvent(jvmti, JVMTI_EVENT_CLASS_LOAD))) {
return JNI_ERR;
}
if (!NSK_VERIFY(nsk_jvmti_aod_addMultiagentsOptions(jvmti, options))) {
return JNI_ERR;
}
NSK_DISPLAY1("%s: initialization was done\n", agentName);
if (!NSK_VERIFY(nsk_aod_agentLoaded(jni, agentName)))
return JNI_ERR;
return JNI_OK;
}
}
|
