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(NSK_CPP_STUB4(GetClassSignature, jvmti_env,
55 klass, &className, &generic)) ) {
56 NSK_DISPLAY0(" Agent :: Failed get class signature.\n");
57 nsk_jvmti_agentFailed();
58 } else {
59 if( (strcmp(className, CLASS_NAME) == 0 ) ) {
60 jfieldID fieldId;
61 if ( ! NSK_JNI_VERIFY(jni, (fieldId = NSK_CPP_STUB4(GetStaticFieldID,
62 jni, klass, FIELDNAME, TYPE) ) != NULL ) ) {
63 NSK_DISPLAY0(" Agent :: Failed to get FieldId.\n");
64 nsk_jvmti_agentFailed();
65 } else {
66 if ( ! NSK_JVMTI_VERIFY( NSK_CPP_STUB3(SetFieldAccessWatch,
67 jvmti_env, klass, fieldId) ) ) {
68 NSK_DISPLAY0(" Agent :: Failed to set watch point on a field.\n");
69 nsk_jvmti_agentFailed();
70 } else {
71 nsk_jvmti_enableNotification(jvmti_env, JVMTI_EVENT_FIELD_ACCESS, NULL);
72 if (! NSK_JNI_VERIFY(jni,
73 ( watchFieldClass = (jclass)
74 NSK_CPP_STUB2(NewGlobalRef, jni, klass) )
75 != NULL ) ) {
76 NSK_DISPLAY0(" Agent :: Failed to get global reference for class.\n");
77 nsk_jvmti_agentFailed();
78 }
79 NSK_DISPLAY0(" Agent :: SetFieldAccessWatch.\n");
80 }
81 }
82 NSK_DISPLAY1(" Agent :: Leaving callbackClassPrepare for class = %s .\n", className);
83 }
84 }
85
86 if ( className != NULL ) {
87 if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB2(Deallocate, jvmti_env, (unsigned char *)className))) {
88 NSK_DISPLAY1(" Agent :: #error failed to Deallocate className = %s.", className);
89 nsk_jvmti_agentFailed();
90 }
91 }
92
93 if ( generic != NULL ) {
94 if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB2(Deallocate, jvmti_env, (unsigned char *)generic))) {
95 NSK_DISPLAY1(" Agent :: #error failed to Deallocate class signature = %s.", generic);
96 nsk_jvmti_agentFailed();
97 }
98 }
99 return;
100 }
101
102 JNIEXPORT void JNICALL callbackFieldAccess(jvmtiEnv *jvmti_env,
103 JNIEnv* jni,
104 jthread thread,
105 jmethodID method,
106 jlocation location,
107 jclass field_klass,
108 jobject object,
109 jfieldID field) {
110 char fileName[512];
111 char * className;
112 char * generic;
113
114 className = NULL;
115 generic = NULL;
116 if (redefineNumber != 0 ) {
117 return;
118 }
119 if ( ! NSK_JVMTI_VERIFY(NSK_CPP_STUB4(GetClassSignature, jvmti_env,
120 field_klass, &className, &generic)) ) {
121 NSK_DISPLAY0(" Agent :: Failed get class signature.\n");
122 nsk_jvmti_agentFailed();
123 } else {
124 if( (strcmp(className, CLASS_NAME) == 0 ) ) {
125 jvmtiThreadInfo info;
126 nsk_jvmti_getFileName(redefineNumber, FILE_NAME, fileName,
127 sizeof(fileName)/sizeof(char));
128 if ( nsk_jvmti_redefineClass(jvmti_env, field_klass, fileName) == NSK_TRUE ) {
129 NSK_DISPLAY0(" Agent :: Successfully redefined.\n");
130 redefineNumber++;
131 } else {
132 NSK_DISPLAY0(" Agent :: Failed to redefine.\n");
133 nsk_jvmti_agentFailed();
134 }
135 NSK_DISPLAY0(" Agent :: Before attempting thread suspend.\n");
136 if ( ! NSK_JVMTI_VERIFY( NSK_CPP_STUB3(GetThreadInfo, jvmti_env, thread , &info)) ) {
137 NSK_DISPLAY0(" Agent :: error getting thread info ");
138 nsk_jvmti_agentFailed();
139 } else {
140 NSK_DISPLAY1(" Agent :: Thread Name = %s .\n", info.name);
141 }
142 if ( ! NSK_JVMTI_VERIFY( NSK_CPP_STUB2(SuspendThread, jvmti_env, thread)) ) {
143 NSK_DISPLAY0(" Agent :: Failed to suspend thread.\n");
144 nsk_jvmti_agentFailed();
145 }
146 }
147 }
148
149 if ( className != NULL ) {
150 if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB2(Deallocate, jvmti_env, (unsigned char *)className))) {
151 NSK_DISPLAY1(" Agent :: #error failed to Deallocate className = %s.", className);
152 nsk_jvmti_agentFailed();
153 }
154 }
155
156 if ( generic != NULL ) {
157 if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB2(Deallocate, jvmti_env, (unsigned char *)generic))) {
158 NSK_DISPLAY1(" Agent :: #error failed to Deallocate class signature = %s.", generic);
159 nsk_jvmti_agentFailed();
160 }
161 }
162 }
163
164 #ifdef STATIC_BUILD
165 JNIEXPORT jint JNICALL Agent_OnLoad_hs204t003(JavaVM *jvm, char *options, void *reserved) {
166 return Agent_Initialize(jvm, options, reserved);
167 }
168 JNIEXPORT jint JNICALL Agent_OnAttach_hs204t003(JavaVM *jvm, char *options, void *reserved) {
169 return Agent_Initialize(jvm, options, reserved);
170 }
171 JNIEXPORT jint JNI_OnLoad_hs204t003(JavaVM *jvm, char *options, void *reserved) {
172 return JNI_VERSION_1_8;
173 }
174 #endif
175 jint Agent_Initialize(JavaVM *vm, char *options, void *reserved) {
176 if ( ! NSK_VERIFY ( JNI_OK == NSK_CPP_STUB3(GetEnv, vm,
177 (void **)&jvmti, JVMTI_VERSION_1_1) ) ) {
178 NSK_DISPLAY0("Agent :: Could not load JVMTI interface \n");
179 return JNI_ERR;
180 } else {
181 jvmtiCapabilities caps;
182 jvmtiEventCallbacks eventCallbacks;
183 memset(&caps, 0, sizeof(caps));
184 if (!nsk_jvmti_parseOptions(options)) {
185 NSK_DISPLAY0(" NSK Failed to parse..");
186 return JNI_ERR;
187 }
188 caps.can_redefine_classes = 1;
189 caps.can_generate_field_access_events = 1;
190 caps.can_pop_frame = 1;
191 caps.can_suspend = 1;
192 if ( ! NSK_JVMTI_VERIFY(NSK_CPP_STUB2( AddCapabilities, jvmti, &caps)) ) {
193 NSK_DISPLAY0(" Agent :: Failed add required capabilities\n.");
194 return JNI_ERR;
195 }
196 memset(&eventCallbacks, 0, sizeof(eventCallbacks));
197 eventCallbacks.ClassPrepare = callbackClassPrepare;
198 eventCallbacks.FieldAccess = callbackFieldAccess;
199 if (!NSK_JVMTI_VERIFY( NSK_CPP_STUB3(SetEventCallbacks, jvmti,
200 &eventCallbacks, sizeof(eventCallbacks) ) ) ) {
201 NSK_DISPLAY0(" Agent :: Error occured while setting event call back \n");
202 return JNI_ERR;
203 }
204 nsk_jvmti_enableNotification(jvmti, JVMTI_EVENT_CLASS_PREPARE, NULL);
205 }
206 return JNI_OK;
207 }
208
209 JNIEXPORT jboolean JNICALL
210 Java_nsk_jvmti_scenarios_hotswap_HS204_hs204t003_hs204t003_popFrame(JNIEnv * jni,
211 jobject object,
212 jthread thread) {
213 jboolean retvalue;
214 jint state;
215 retvalue = JNI_FALSE;
216 if (! NSK_JVMTI_VERIFY( NSK_CPP_STUB3(GetThreadState, jvmti, thread, &state)) ){
217 NSK_DISPLAY0(" Agent :: Error getting thread state.\n");
218 nsk_jvmti_agentFailed();
219 } else {
220 if ( state & JVMTI_THREAD_STATE_SUSPENDED) {
221 NSK_DISPLAY0(" Agent :: Thread state = JVMTI_THREAD_STATE_SUSPENDED.\n");
222 if ( ! NSK_JVMTI_VERIFY ( NSK_CPP_STUB2(PopFrame, jvmti, thread) ) ) {
223 NSK_DISPLAY0("#error Agent :: Jvmti failed to do popFrame.\n");
224 nsk_jvmti_agentFailed();
225 } else {
226 if ( ! NSK_JVMTI_VERIFY ( NSK_CPP_STUB2(ResumeThread, jvmti, thread)) ) {
227 NSK_DISPLAY0(" Agent :: Error occured in resuming a thread.\n");
228 nsk_jvmti_agentFailed();
229 } else {
230 jfieldID fieldId;
231 if ( ! NSK_JNI_VERIFY(jni, (fieldId = NSK_CPP_STUB4(GetStaticFieldID,
232 jni, watchFieldClass, FIELDNAME, TYPE) ) != NULL ) ) {
233 NSK_DISPLAY0(" Agent :: Failed to get FieldId before droping watchers.\n");
234 nsk_jvmti_agentFailed();
235 } else {
236 if ( ! NSK_JVMTI_VERIFY ( NSK_CPP_STUB3(ClearFieldAccessWatch,
237 jvmti, watchFieldClass, fieldId)) ) {
238 NSK_DISPLAY0(" Agent :: failed to drop field watces.\n");
239 nsk_jvmti_agentFailed();
240 } else {
241 NSK_DISPLAY0(" Agent :: Sucessfully droped watches.\n");
242 retvalue = JNI_TRUE;
243 }
244 }
245 }
246 }
247 } else {
248 NSK_DISPLAY0(" Agent :: Thread should be suspended to its pop frame.\n");
249 }
250 }
251 return retvalue;
252 }
253 }