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 <jvmti.h>
27 #include "agent_common.h"
28 #include <jni.h>
29 #include "jvmti_tools.h"
30 #include "jni_tools.h"
31 #include "JVMTITools.h"
32
33 extern "C" {
34
35 #define FILE_NAME "nsk/jvmti/scenarios/hotswap/HS204/hs204t003/MyThread"
36 #define CLASS_NAME "Lnsk/jvmti/scenarios/hotswap/HS204/hs204t003/MyThread;"
37 #define FIELDNAME "intState"
38 #define TYPE "I"
39
40 static jint redefineNumber;
41 static jvmtiEnv * jvmti;
42 static jclass watchFieldClass;
43
44 JNIEXPORT void JNICALL callbackClassPrepare(jvmtiEnv *jvmti_env,
45 JNIEnv* jni,
46 jthread thread,
47 jclass klass) {
48 char * className;
49 char * generic;
50
51 className = NULL;
52 generic = NULL;
53 redefineNumber=0;
54 if ( !NSK_JVMTI_VERIFY(jvmti_env->GetClassSignature(klass, &className, &generic)) ) {
55 NSK_DISPLAY0(" Agent :: Failed get class signature.\n");
56 nsk_jvmti_agentFailed();
57 } else {
58 if( (strcmp(className, CLASS_NAME) == 0 ) ) {
59 jfieldID fieldId;
60 if ( ! NSK_JNI_VERIFY(jni, (fieldId = jni->GetStaticFieldID(klass, FIELDNAME, TYPE) ) != NULL ) ) {
61 NSK_DISPLAY0(" Agent :: Failed to get FieldId.\n");
62 nsk_jvmti_agentFailed();
63 } else {
64 if ( ! NSK_JVMTI_VERIFY(jvmti_env->SetFieldAccessWatch(klass, fieldId) ) ) {
65 NSK_DISPLAY0(" Agent :: Failed to set watch point on a field.\n");
66 nsk_jvmti_agentFailed();
67 } else {
68 nsk_jvmti_enableNotification(jvmti_env, JVMTI_EVENT_FIELD_ACCESS, NULL);
69 if (! NSK_JNI_VERIFY(jni,
70 ( watchFieldClass = (jclass)
71 jni->NewGlobalRef(klass) )
72 != NULL ) ) {
73 NSK_DISPLAY0(" Agent :: Failed to get global reference for class.\n");
74 nsk_jvmti_agentFailed();
75 }
76 NSK_DISPLAY0(" Agent :: SetFieldAccessWatch.\n");
77 }
78 }
79 NSK_DISPLAY1(" Agent :: Leaving callbackClassPrepare for class = %s .\n", className);
80 }
81 }
82
83 if ( className != NULL ) {
84 if (!NSK_JVMTI_VERIFY(jvmti_env->Deallocate((unsigned char *)className))) {
85 NSK_DISPLAY1(" Agent :: #error failed to Deallocate className = %s.", className);
86 nsk_jvmti_agentFailed();
87 }
88 }
89
90 if ( generic != NULL ) {
91 if (!NSK_JVMTI_VERIFY(jvmti_env->Deallocate((unsigned char *)generic))) {
92 NSK_DISPLAY1(" Agent :: #error failed to Deallocate class signature = %s.", generic);
93 nsk_jvmti_agentFailed();
94 }
95 }
96 return;
97 }
98
99 JNIEXPORT void JNICALL callbackFieldAccess(jvmtiEnv *jvmti_env,
100 JNIEnv* jni,
101 jthread thread,
102 jmethodID method,
103 jlocation location,
104 jclass field_klass,
105 jobject object,
106 jfieldID field) {
107 char fileName[512];
108 char * className;
109 char * generic;
110
111 className = NULL;
112 generic = NULL;
113 if (redefineNumber != 0 ) {
114 return;
115 }
116 if ( ! NSK_JVMTI_VERIFY(jvmti_env->GetClassSignature(field_klass, &className, &generic)) ) {
117 NSK_DISPLAY0(" Agent :: Failed get class signature.\n");
118 nsk_jvmti_agentFailed();
119 } else {
120 if( (strcmp(className, CLASS_NAME) == 0 ) ) {
121 jvmtiThreadInfo info;
122 nsk_jvmti_getFileName(redefineNumber, FILE_NAME, fileName,
123 sizeof(fileName)/sizeof(char));
124 if ( nsk_jvmti_redefineClass(jvmti_env, field_klass, fileName) == NSK_TRUE ) {
125 NSK_DISPLAY0(" Agent :: Successfully redefined.\n");
126 redefineNumber++;
127 } else {
128 NSK_DISPLAY0(" Agent :: Failed to redefine.\n");
129 nsk_jvmti_agentFailed();
130 }
131 NSK_DISPLAY0(" Agent :: Before attempting thread suspend.\n");
132 if ( ! NSK_JVMTI_VERIFY(jvmti_env->GetThreadInfo(thread, &info))) {
133 NSK_DISPLAY0(" Agent :: error getting thread info ");
134 nsk_jvmti_agentFailed();
135 } else {
136 NSK_DISPLAY1(" Agent :: Thread Name = %s .\n", info.name);
137 }
138 if ( ! NSK_JVMTI_VERIFY(jvmti_env->SuspendThread(thread))) {
139 NSK_DISPLAY0(" Agent :: Failed to suspend thread.\n");
140 nsk_jvmti_agentFailed();
141 }
142 }
143 }
144
145 if ( className != NULL ) {
146 if (!NSK_JVMTI_VERIFY(jvmti_env->Deallocate((unsigned char *)className))) {
147 NSK_DISPLAY1(" Agent :: #error failed to Deallocate className = %s.", className);
148 nsk_jvmti_agentFailed();
149 }
150 }
151
152 if ( generic != NULL ) {
153 if (!NSK_JVMTI_VERIFY(jvmti_env->Deallocate((unsigned char *)generic))) {
154 NSK_DISPLAY1(" Agent :: #error failed to Deallocate class signature = %s.", generic);
155 nsk_jvmti_agentFailed();
156 }
157 }
158 }
159
160 #ifdef STATIC_BUILD
161 JNIEXPORT jint JNICALL Agent_OnLoad_hs204t003(JavaVM *jvm, char *options, void *reserved) {
162 return Agent_Initialize(jvm, options, reserved);
163 }
164 JNIEXPORT jint JNICALL Agent_OnAttach_hs204t003(JavaVM *jvm, char *options, void *reserved) {
165 return Agent_Initialize(jvm, options, reserved);
166 }
167 JNIEXPORT jint JNI_OnLoad_hs204t003(JavaVM *jvm, char *options, void *reserved) {
168 return JNI_VERSION_1_8;
169 }
170 #endif
171 jint Agent_Initialize(JavaVM *vm, char *options, void *reserved) {
172 if ( ! NSK_VERIFY ( JNI_OK == vm->GetEnv((void **)&jvmti, JVMTI_VERSION_1_1) ) ) {
173 NSK_DISPLAY0("Agent :: Could not load JVMTI interface \n");
174 return JNI_ERR;
175 } else {
176 jvmtiCapabilities caps;
177 jvmtiEventCallbacks eventCallbacks;
178 memset(&caps, 0, sizeof(caps));
179 if (!nsk_jvmti_parseOptions(options)) {
180 NSK_DISPLAY0(" NSK Failed to parse..");
181 return JNI_ERR;
182 }
183 caps.can_redefine_classes = 1;
184 caps.can_generate_field_access_events = 1;
185 caps.can_pop_frame = 1;
186 caps.can_suspend = 1;
187 if ( ! NSK_JVMTI_VERIFY(jvmti->AddCapabilities(&caps)) ) {
188 NSK_DISPLAY0(" Agent :: Failed add required capabilities\n.");
189 return JNI_ERR;
190 }
191 memset(&eventCallbacks, 0, sizeof(eventCallbacks));
192 eventCallbacks.ClassPrepare = callbackClassPrepare;
193 eventCallbacks.FieldAccess = callbackFieldAccess;
194 if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&eventCallbacks, sizeof(eventCallbacks) ) ) ) {
195 NSK_DISPLAY0(" Agent :: Error occured while setting event call back \n");
196 return JNI_ERR;
197 }
198 nsk_jvmti_enableNotification(jvmti, JVMTI_EVENT_CLASS_PREPARE, NULL);
199 }
200 return JNI_OK;
201 }
202
203 JNIEXPORT jboolean JNICALL
204 Java_nsk_jvmti_scenarios_hotswap_HS204_hs204t003_hs204t003_popFrame(JNIEnv * jni,
205 jobject object,
206 jthread thread) {
207 jboolean retvalue;
208 jint state;
209 retvalue = JNI_FALSE;
210 if (! NSK_JVMTI_VERIFY(jvmti->GetThreadState(thread, &state))) {
211 NSK_DISPLAY0(" Agent :: Error getting thread state.\n");
212 nsk_jvmti_agentFailed();
213 } else {
214 if ( state & JVMTI_THREAD_STATE_SUSPENDED) {
215 NSK_DISPLAY0(" Agent :: Thread state = JVMTI_THREAD_STATE_SUSPENDED.\n");
216 if ( ! NSK_JVMTI_VERIFY ( jvmti->PopFrame(thread) ) ) {
217 NSK_DISPLAY0("#error Agent :: Jvmti failed to do popFrame.\n");
218 nsk_jvmti_agentFailed();
219 } else {
220 if ( ! NSK_JVMTI_VERIFY ( jvmti->ResumeThread(thread) ) ) {
221 NSK_DISPLAY0(" Agent :: Error occured in resuming a thread.\n");
222 nsk_jvmti_agentFailed();
223 } else {
224 jfieldID fieldId = jni->GetStaticFieldID(watchFieldClass, FIELDNAME, TYPE);
225 if ( ! NSK_JNI_VERIFY(jni, fieldId != NULL ) ) {
226 NSK_DISPLAY0(" Agent :: Failed to get FieldId before droping watchers.\n");
227 nsk_jvmti_agentFailed();
228 } else {
229 if ( ! NSK_JVMTI_VERIFY ( jvmti->ClearFieldAccessWatch(watchFieldClass, fieldId) ) ) {
230 NSK_DISPLAY0(" Agent :: failed to drop field watces.\n");
231 nsk_jvmti_agentFailed();
232 } else {
233 NSK_DISPLAY0(" Agent :: Sucessfully droped watches.\n");
234 retvalue = JNI_TRUE;
235 }
236 }
237 }
238 }
239 } else {
240 NSK_DISPLAY0(" Agent :: Thread should be suspended to its pop frame.\n");
241 }
242 }
243 return retvalue;
244 }
245 }