1 /*
2 * Copyright (c) 2007, 2019, 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 <jni.h>
24 #include <jvmti.h>
25 #include "agent_common.h"
26 #include <string.h>
27 #include "jvmti_tools.h"
28 #include "JVMTITools.h"
29 /*
30 hs202t001:
31 1. Set breakpoints in several methods when Object.wait(),
32 Object.notify(), Object.notifyAll() are in use in these methods.
33 2. Upon reaching a breakpoint, enable SingleStep.
34 3. Redefine an java.lang.Object class within SingleStep callback
35 when one of its methods is called by the tested method.
36 4. Pop a currently executed frame.
37
38 */
39 extern "C" {
40 #define FILE_NAME "nsk/jvmti/scenarios/hotswap/HS202/hs203t001/MyObject"
41 #define CLASS_NAME "Lnsk/jvmti/scenarios/hotswap/HS202/hs203t001/MyObject;"
42 #define METHOD_NAME "leaveMonitor"
43 #define METHOD_SIGN "()V"
44 #define METHOD_NOTIFYALL "notifyAll"
45
46 static jvmtiEnv * jvmti;
47
48
49 JNIEXPORT void JNICALL callbackClassPrepare(jvmtiEnv *jvmti,
50 JNIEnv* jni,
51 jthread thread,
52 jclass klass) {
53 char * className;
54 char * generic;
55 jvmti->GetClassSignature(klass, &className, &generic);
56 if (strcmp(className,CLASS_NAME) == 0) {
57 jmethodID method;
58 method = jni->GetMethodID(klass, METHOD_NAME, METHOD_SIGN);
59 if (method == NULL) {
60 nsk_printf("Agent:: Method is null ");
61 } else {
62 jlocation start;
63 jlocation end;
64 jvmtiError err ;
65 err=jvmti->GetMethodLocation(method, &start, &end);
66 if (err != JVMTI_ERROR_NONE) {
67 nsk_printf(" ## Error occured %s \n",TranslateError(err));
68 }else {
69 nsk_printf("\n Start = %d and end = %d ", start , end);
70 nsk_printf(" setting break points..");
71 err= jvmti->SetBreakpoint(method, start);
72 if (err != JVMTI_ERROR_NONE) {
73 nsk_printf(" ## Error occured %s \n",TranslateError(err));
74 } else {
75 nsk_printf(" NO ERRORS ");
76 if (nsk_jvmti_enableNotification(jvmti,JVMTI_EVENT_BREAKPOINT, NULL) == NSK_TRUE) {
77 nsk_printf(" Enabled.. notification event ..\n");
78 }
79 }
80 }
81 }
82 }
83 }
84
85 /*
86 *This event call back will be called when a filed
87 *threadState is beeing upodated or beeing used in
88 *the program java flow.
89 *In this current example the code will be called
90 */
91 void JNICALL callbackSingleStep(jvmtiEnv *jvmti_env,
92 JNIEnv* jni,
93 jthread thread,
94 jmethodID method,
95 jlocation location) {
96 jvmtiError err;
97 char * name;
98 char * signature;
99 char * generic ;
100 err = JVMTI_ERROR_NONE;
101 jvmti_env->GetMethodName(method, &name, &signature, &generic);
102 if (strcmp(name,METHOD_NAME) == 0) { /* same method */
103 jclass cls;
104 jmethodID mem ;
105 jvmti_env->GetMethodDeclaringClass(method, &cls);
106 mem=jni->GetMethodID(cls,METHOD_NOTIFYALL,"()V");
107 jni->CallVoidMethod(thread,mem);
108 }
109
110 }
111
112 void JNICALL callbackBreakpoint(jvmtiEnv *jvmti_env,
113 JNIEnv* jni_env,
114 jthread thread,
115 jmethodID method,
116 jlocation location) {
117 jvmtiError err;
118 err = JVMTI_ERROR_NONE;
119 if (nsk_jvmti_enableNotification(jvmti,JVMTI_EVENT_SINGLE_STEP, NULL) == NSK_TRUE) {
120 nsk_printf(" Enabled.. notification event ..");
121 }
122 err= jvmti->SetEventNotificationMode(JVMTI_DISABLE,
123 JVMTI_EVENT_BREAKPOINT, NULL);
124 if (err == JVMTI_ERROR_NONE) {
125 nsk_printf(" Disabled notification..");
126 }
127
128 }
129
130
131 #ifdef STATIC_BUILD
132 JNIEXPORT jint JNICALL Agent_OnLoad_hs202t001(JavaVM *jvm, char *options, void *reserved) {
133 return Agent_Initialize(jvm, options, reserved);
134 }
135 JNIEXPORT jint JNICALL Agent_OnAttach_hs202t001(JavaVM *jvm, char *options, void *reserved) {
136 return Agent_Initialize(jvm, options, reserved);
137 }
138 JNIEXPORT jint JNI_OnLoad_hs202t001(JavaVM *jvm, char *options, void *reserved) {
139 return JNI_VERSION_1_8;
140 }
141 #endif
142 jint Agent_Initialize(JavaVM *vm, char *options, void *reserved) {
143 jvmtiError rc;
144 jint code;
145 nsk_printf("Agent:: VM.. Started..\n");
146 code = vm->GetEnv((void **)&jvmti, JVMTI_VERSION_1_1);
147 if (code != JNI_OK) {
148 nsk_printf("Agent:: Could not load JVMTI interface \n");
149 return JNI_ERR;
150 } else {
151 jvmtiCapabilities caps;
152 jvmtiEventCallbacks eventCallbacks;
153 memset(&caps, 0, sizeof(caps));
154 if (!nsk_jvmti_parseOptions(options)) {
155 nsk_printf("# error agent Failed to parse options \n");
156 return JNI_ERR;
157 }
158 caps.can_redefine_classes = 1;
159 caps.can_suspend = 1;
160 caps.can_pop_frame = 1;
161 caps.can_generate_all_class_hook_events = 1;
162 caps.can_generate_compiled_method_load_events = 1;
163 caps.can_generate_breakpoint_events=1;
164 caps.can_generate_single_step_events=1;
165 jvmti->AddCapabilities(&caps);
166 memset(&eventCallbacks, 0, sizeof(eventCallbacks));
167 eventCallbacks.ClassPrepare =callbackClassPrepare;
168 eventCallbacks.SingleStep =callbackSingleStep;
169 eventCallbacks.Breakpoint =callbackBreakpoint;
170 rc = jvmti->SetEventCallbacks(&eventCallbacks, sizeof(eventCallbacks));
171 if (rc != JVMTI_ERROR_NONE) {
172 nsk_printf(" ## Error occured %s \n",TranslateError(rc));
173 return JNI_ERR;
174 }
175 if (nsk_jvmti_enableNotification(jvmti,JVMTI_EVENT_CLASS_PREPARE, NULL) == NSK_TRUE) {
176 nsk_printf("Agent :: NOTIFICATIONS ARE ENABLED \n");
177 } else {
178 nsk_printf(" Error in Eanableing Notifications..");
179 }
180 }
181 return JNI_OK;
182 }
183
184 JNIEXPORT jboolean JNICALL
185 Java_nsk_jvmti_scenarios_hotswap_HS202_hs202t001_hs202t001_popThreadFrame(JNIEnv * jni,
186 jclass clas,
187 jthread thread) {
188 jvmtiError err ;
189 jboolean retvalue;
190 jint state;
191 nsk_printf("Agent:: POPING THE FRAME....\n");
192 retvalue = JNI_FALSE;
193 jvmti->GetThreadState(thread, &state);
194 if (state & JVMTI_THREAD_STATE_SUSPENDED) {
195 err = jvmti->PopFrame(thread);
196 if (err == JVMTI_ERROR_NONE) {
197 nsk_printf("Agent:: NO Errors poped very well ..\n");
198 retvalue=JNI_OK;
199 return retvalue;
200 } else if (err != JVMTI_ERROR_NONE) {
201 nsk_printf(" ## Error occured %s \n",TranslateError(err));
202 }
203 nsk_printf("Agent:: some other error ..\n");
204 } else {
205 nsk_printf("Agent:: Thread was not suspened.. check for capabilities, and java method signature ");
206 }
207 return retvalue;
208 }
209
210 JNIEXPORT jboolean JNICALL
211 Java_nsk_jvmti_scenarios_hotswap_HS202_hs202t001_hs202t001_resumeThread(JNIEnv * jni,
212 jclass clas,
213 jthread thread) {
214 jvmtiError err ;
215 jboolean retvalue;
216 retvalue = JNI_FALSE;
217 err = jvmti->ResumeThread(thread);
218 if (err == JVMTI_ERROR_NONE) {
219 nsk_printf(" Agent:: Thread Resumed.. \n");
220 retvalue=JNI_OK;
221 } else {
222 nsk_printf(" Agent:: Failed.. to Resume the thread.\n");
223 }
224 return retvalue;
225 }
226
227 }