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 <jvmti.h>
26 #include "agent_common.h"
27 #include <jni.h>
28 #include <string.h>
29 #include "jvmti_tools.h"
30 #include "jni_tools.h"
31 #include "JVMTITools.h"
32 /*
33 hs203T003:
34 1. Set FieldAccessWatch, FieldModificatoinWatch for a field.
35 2. Upon access/modification of the field within a method, redefine
36 a class with the changed field version, and pop a currently executed
37 frame within FieldAccess/FieldModification callback.
38
39 */
40 extern "C" {
41 #define DIR_NAME "newclass"
42 #define PATH_FORMAT "%s%02d/%s"
43
44 #define FILE_NAME "nsk/jvmti/scenarios/hotswap/HS203/hs203t003/MyThread"
45 #define CLASS_NAME "Lnsk/jvmti/scenarios/hotswap/HS203/hs203t003/MyThread;"
46 #define SEARCH_NAME "nsk/jvmti/scenarios/hotswap/HS203/hs203t003/MyThread"
47 #define FIELDNAME "threadState"
48 #define TYPE "I"
49
50 static jint redefineNumber;
51 static jvmtiEnv * jvmti;
52 static int redefineCnt=0;
53
54 JNIEXPORT void JNICALL callbackClassPrepare(jvmtiEnv *jvmti_env,
55 JNIEnv* jni,
56 jthread thread,
57 jclass klass) {
58 char * className;
59 char * generic;
60 redefineNumber=0;
61 className=NULL;
62 generic=NULL;
63 if ( ! NSK_JVMTI_VERIFY ( NSK_CPP_STUB4(GetClassSignature,
64 jvmti_env, klass, &className, &generic) ) ) {
65 nsk_printf("#error Agent :: while getting classname Signature.\n");
66 nsk_jvmti_agentFailed();
67 } else {
68 if (strcmp(className,CLASS_NAME) == 0) {
69 jfieldID field;
70 /* get the field id and set watch on that .*/
71 if (! NSK_JNI_VERIFY(jni, (field = NSK_CPP_STUB4(GetFieldID,
72 jni, klass, FIELDNAME, TYPE)) != NULL) ) {
73 nsk_printf(" Agent :: (*JNI)->GetFieldID(jni, ... ) returns `null`.\n");
74 nsk_jvmti_agentFailed();
75 } else if ( ! NSK_JVMTI_VERIFY(NSK_CPP_STUB3(SetFieldAccessWatch,
76 jvmti_env, klass, field) ) ) {
77 nsk_printf("#error Agent :: occured while jvmti->SetFieldAccessWatch(... ) .\n");
78 nsk_jvmti_agentFailed();
79 }
80 }
81 }
82 }
83
84 JNIEXPORT void JNICALL callbackFieldAccess(jvmtiEnv *jvmti_env,
85 JNIEnv* jni,
86 jthread thread,
87 jmethodID method,
88 jlocation location,
89 jclass field_klass,
90 jobject object,
91 jfieldID field) {
92 jclass clas;
93 char fileName[512];
94 if (redefineCnt < 10) {
95 redefineCnt++;
96 return;
97 }
98 redefineNumber=0;
99 if (! NSK_JNI_VERIFY(jni, (clas = NSK_CPP_STUB2(FindClass, jni, SEARCH_NAME)) != NULL) ) {
100 nsk_printf(" Agent :: (*JNI)->FindClass(jni, %s) returns `null`.\n",SEARCH_NAME);
101 nsk_jvmti_agentFailed();
102 } else {
103 nsk_jvmti_getFileName(redefineNumber, FILE_NAME, fileName,
104 sizeof(fileName)/sizeof(char));
105 if ( nsk_jvmti_redefineClass(jvmti_env, clas, fileName ) != NSK_TRUE) {
106 nsk_printf(" Agent :: Failed to redefine.\n");
107 nsk_jvmti_agentFailed();
108 } else {
109 nsk_printf(" Agent :: Redefined.\n");
110 nsk_printf(" Agent :: Suspendeding thread.\n");
111 /* pop the current working frame. */
112 if ( ! NSK_JVMTI_VERIFY( NSK_CPP_STUB2(SuspendThread, jvmti_env, thread) ) ) {
113 nsk_printf("#error Agent :: occured suspending Thread.\n");
114 nsk_jvmti_agentFailed();
115 } else {
116 nsk_printf(" Agent :: Succeded in suspending.\n");
117 }
118 }
119 }
120 }
121
122 #ifdef STATIC_BUILD
123 JNIEXPORT jint JNICALL Agent_OnLoad_hs203t003(JavaVM *jvm, char *options, void *reserved) {
124 return Agent_Initialize(jvm, options, reserved);
125 }
126 JNIEXPORT jint JNICALL Agent_OnAttach_hs203t003(JavaVM *jvm, char *options, void *reserved) {
127 return Agent_Initialize(jvm, options, reserved);
128 }
129 JNIEXPORT jint JNI_OnLoad_hs203t003(JavaVM *jvm, char *options, void *reserved) {
130 return JNI_VERSION_1_8;
131 }
132 #endif
133 jint Agent_Initialize(JavaVM *vm, char *options, void *reserved) {
134 if ( ! NSK_VERIFY ( JNI_OK == NSK_CPP_STUB3(GetEnv, vm,
135 (void **)&jvmti, JVMTI_VERSION_1_1) ) ) {
136 nsk_printf(" Agent :: Could not load JVMTI interface.\n");
137 return JNI_ERR;
138 } else {
139 jvmtiCapabilities caps;
140 jvmtiEventCallbacks eventCallbacks;
141 if (nsk_jvmti_parseOptions(options) == NSK_FALSE ) {
142 nsk_printf("#error Agent :: Failed to parse options.\n");
143 return JNI_ERR;
144 }
145 memset(&caps, 0, sizeof(caps));
146 caps.can_redefine_classes = 1;
147 caps.can_suspend=1;
148 caps.can_pop_frame=1;
149 caps.can_generate_all_class_hook_events=1;
150 caps.can_generate_field_access_events=1;
151 if (! NSK_JVMTI_VERIFY ( NSK_CPP_STUB2(AddCapabilities, jvmti, &caps) )) {
152 nsk_printf("#error Agent :: while adding capabilities.\n");
153 return JNI_ERR;
154 }
155 memset(&eventCallbacks, 0, sizeof(eventCallbacks));
156 eventCallbacks.ClassPrepare =callbackClassPrepare;
157 eventCallbacks.FieldAccess= callbackFieldAccess;
158 if (!NSK_JVMTI_VERIFY(
159 NSK_CPP_STUB3(SetEventCallbacks, jvmti,
160 &eventCallbacks, sizeof(eventCallbacks)))) {
161 nsk_printf("#error Agent :: while setting event callbacks.\n");
162 return JNI_ERR;
163 }
164 if ( ( nsk_jvmti_enableNotification(jvmti,JVMTI_EVENT_CLASS_PREPARE, NULL)
165 == NSK_TRUE ) &&
166 ( nsk_jvmti_enableNotification(jvmti,JVMTI_EVENT_FIELD_ACCESS, NULL)
167 == NSK_TRUE ) ) {
168 nsk_printf(" Agent :: Notifications are enabled.\n");
169 } else {
170 nsk_printf("#error Agent :: Eanableing Notifications.\n");
171 return JNI_ERR;
172 }
173 }
174 return JNI_OK;
175 }
176
177 JNIEXPORT jboolean JNICALL
178 Java_nsk_jvmti_scenarios_hotswap_HS203_hs203t003_hs203t003_isSuspended(JNIEnv * jni,
179 jclass clas,
180 jthread thread) {
181 jboolean retvalue;
182 jint state;
183 retvalue = JNI_FALSE;
184 if ( ! NSK_JVMTI_VERIFY( NSK_CPP_STUB3(GetThreadState, jvmti, thread, &state) ) ) {
185 nsk_printf(" Agent :: Error while getting thread state.\n");
186 nsk_jvmti_agentFailed();
187 } else {
188 if ( state & JVMTI_THREAD_STATE_SUSPENDED) {
189 retvalue = JNI_TRUE;
190 }
191 }
192 return retvalue;
193 }
194
195 JNIEXPORT jboolean JNICALL
196 Java_nsk_jvmti_scenarios_hotswap_HS203_hs203t003_hs203t003_popThreadFrame(JNIEnv * jni,
197 jclass clas,
198 jthread thread) {
199 jboolean retvalue;
200 jint state;
201 retvalue = JNI_FALSE;
202 if ( ! NSK_JVMTI_VERIFY( NSK_CPP_STUB3(GetThreadState, jvmti, thread, &state) ) ) {
203 nsk_printf(" Agent :: Error while getting thread state.\n");
204 nsk_jvmti_agentFailed();
205 } else {
206 if ( state & JVMTI_THREAD_STATE_SUSPENDED) {
207 if ( ! NSK_JVMTI_VERIFY ( NSK_CPP_STUB2( PopFrame, jvmti, thread) ) ) {
208 nsk_printf("#error Agent :: while poping thread's frame.\n");
209 nsk_jvmti_agentFailed();
210 } else {
211 nsk_printf(" Agent :: poped thread frame.\n");
212 if ( ! NSK_JVMTI_VERIFY ( NSK_CPP_STUB4 (SetEventNotificationMode, jvmti,
213 JVMTI_DISABLE, JVMTI_EVENT_FIELD_ACCESS, NULL) ) ) {
214 nsk_printf("#error Agent :: failed to disable notification JVMTI_EVENT_FIELD ACCESS.\n");
215 nsk_jvmti_agentFailed();
216 } else {
217 nsk_printf(" Agent :: Disabled notification JVMTI_EVENT_FIELD ACCESS. \n");
218 retvalue = JNI_TRUE;
219 }
220 }
221 } else {
222 nsk_printf("#error Agent :: Thread was not suspened.");
223 nsk_jvmti_agentFailed();
224 }
225 }
226 return retvalue;
227 }
228
229 JNIEXPORT jboolean JNICALL
230 Java_nsk_jvmti_scenarios_hotswap_HS203_hs203t003_hs203t003_resumeThread(JNIEnv * jni,
231 jclass clas,
232 jthread thread) {
233 jboolean retvalue;
234 retvalue = JNI_FALSE;
235 if ( !NSK_JVMTI_VERIFY( NSK_CPP_STUB2 ( ResumeThread, jvmti, thread)) ) {
236 nsk_printf("#error Agent :: while resuming thread.\n");
237 nsk_jvmti_agentFailed();
238 } else {
239 nsk_printf(" Agent :: Thread resumed.\n");
240 retvalue= JNI_TRUE;
241 }
242 return retvalue;
243 }
244
245 }