1 /*
2 * Copyright (c) 2003, 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
24 #include <stdio.h>
25 #include <string.h>
26 #include "jvmti.h"
27 #include "agent_common.h"
28
29 extern "C" {
30
31
32 #define JVMTI_ERROR_CHECK(str,res) if ( res != JVMTI_ERROR_NONE) { printf(str); printf("%d\n",res); return res;}
33 #define JVMTI_ERROR_CHECK_VOID(str,res) if ( res != JVMTI_ERROR_NONE) { printf(str); printf("%d\n",res); iGlobalStatus = 2; }
34
35 #define THREADS_LIMIT 8
36
37 jrawMonitorID access_lock;
38 jvmtiEnv *jvmti;
39 jint iGlobalStatus = 0;
40 jthread susp_thrd[THREADS_LIMIT];
41 static jvmtiEventCallbacks callbacks;
42 static jvmtiCapabilities jvmti_caps;
43
44
45 int printdump = 0;
46 int gc_start_count =0;
47 int gc_finish_count =0;
48
49
50 void debug_printf(const char *fmt, ...) {
51 va_list args;
52
53 va_start(args, fmt);
54 if (printdump) {
55 vprintf(fmt, args);
56 }
57 va_end(args);
58 }
59
60
61 void JNICALL vmInit(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread) {
62
63 debug_printf("VMInit event done\n");
64 }
65
66 void JNICALL vmExit(jvmtiEnv *jvmti_env, JNIEnv *env) {
67 debug_printf("------------ JVMTI_EVENT_VM_DEATH ------------\n");
68 debug_printf("JVMTI_EVENT_GARBAGE_COLLECTION_START count: %d\n",gc_start_count);
69 debug_printf("JVMTI_EVENT_GARBAGE_COLLECTION_FINISH count: %d\n",gc_finish_count);
70 }
71
72 void JNICALL gc_start(jvmtiEnv *jvmti_env) {
73
74 gc_start_count++;
75 debug_printf("Event: JVMTI_EVENT_GC_START\n");
76 }
77
78 void JNICALL gc_finish(jvmtiEnv *jvmti_env) {
79
80 gc_finish_count++;
81 debug_printf("Event: JVMTI_EVENT_GC_FINISH\n");
82 }
83
84
85 void init_callbacks() {
86 memset((void *)&callbacks, 0, sizeof(jvmtiEventCallbacks));
87 callbacks.VMInit = vmInit;
88 callbacks.VMDeath = vmExit;
89 callbacks.GarbageCollectionStart = gc_start;
90 callbacks.GarbageCollectionFinish = gc_finish;
91 }
92
93
94 #ifdef STATIC_BUILD
95 JNIEXPORT jint JNICALL Agent_OnLoad_gc(JavaVM *jvm, char *options, void *reserved) {
96 return Agent_Initialize(jvm, options, reserved);
97 }
98 JNIEXPORT jint JNICALL Agent_OnAttach_gc(JavaVM *jvm, char *options, void *reserved) {
99 return Agent_Initialize(jvm, options, reserved);
100 }
101 JNIEXPORT jint JNI_OnLoad_gc(JavaVM *jvm, char *options, void *reserved) {
102 return JNI_VERSION_1_8;
103 }
104 #endif
105 jint Agent_Initialize(JavaVM * jvm, char *options, void *reserved) {
106 jint res;
107
108 if (options && strlen(options) > 0) {
109 if (strstr(options, "printdump")) {
110 printdump = 1;
111 }
112 }
113
114 res = jvm->GetEnv((void **) &jvmti, JVMTI_VERSION_1_1);
115 if (res < 0) {
116 debug_printf("Wrong result of a valid call to GetEnv!\n");
117 return JNI_ERR;
118 }
119
120 /* Create data access lock */
121 res = jvmti->CreateRawMonitor("_access_lock", &access_lock);
122 JVMTI_ERROR_CHECK("RawMonitorEnter in monitor_contended_entered failed with error code ", res);
123
124
125 /* Add capabilities */
126 res = jvmti->GetPotentialCapabilities(&jvmti_caps);
127 JVMTI_ERROR_CHECK("SetEventCallbacks returned error", res);
128
129 res = jvmti->AddCapabilities(&jvmti_caps);
130 JVMTI_ERROR_CHECK("SetEventCallbacks returned error", res);
131
132 /* Enable events */
133 init_callbacks();
134 res = jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks));
135 JVMTI_ERROR_CHECK("SetEventCallbacks returned error", res);
136
137 res = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_VM_INIT, NULL);
138 JVMTI_ERROR_CHECK("SetEventNotificationMode for VM_INIT returned error", res);
139
140 res = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_VM_DEATH, NULL);
141 JVMTI_ERROR_CHECK("SetEventNotificationMode for vm death event returned error", res);
142
143 res = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_GARBAGE_COLLECTION_START, NULL);
144 JVMTI_ERROR_CHECK("SetEventNotificationMode for gc start returned error", res);
145
146 res = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_GARBAGE_COLLECTION_FINISH, NULL);
147 JVMTI_ERROR_CHECK("SetEventNotificationMode for gc finish returned error", res);
148
149 return JNI_OK;
150 }
151
152
153
154
155 JNIEXPORT void JNICALL
156 Java_nsk_jvmti_unit_functions_ForceGarbageCollection_gc_checkGCStart(JNIEnv * env, jclass cls) {
157 if (gc_start_count == 0) {
158 printf("Error: JVMTI_EVENT_GARBAGE_COLLECTION_START count = 0\n");
159 iGlobalStatus = 2;
160 }
161 }
162
163 JNIEXPORT void JNICALL
164 Java_nsk_jvmti_unit_functions_ForceGarbageCollection_gc_checkGCFinish(JNIEnv * env, jclass cls) {
165 if (gc_finish_count == 0) {
166 printf("Error: JVMTI_EVENT_GARBAGE_COLLECTION_FINISH count = 0\n");
167 iGlobalStatus = 2;
168 }
169 }
170
171 JNIEXPORT jint JNICALL
172 Java_nsk_jvmti_unit_functions_ForceGarbageCollection_gc_GetResult(JNIEnv * env, jclass cls) {
173 return iGlobalStatus;
174 }
175
176
177 JNIEXPORT void JNICALL
178 Java_nsk_jvmti_unit_functions_ForceGarbageCollection_gc_jvmtiForceGC (JNIEnv * env, jclass cls) {
179 jvmtiError ret;
180
181 debug_printf("jvmti Force gc requested \n");
182 ret = jvmti->ForceGarbageCollection();
183
184 if (ret != JVMTI_ERROR_NONE) {
185 printf("Error: ForceGarbageCollection %d \n", ret);
186 iGlobalStatus = 2;
187 }
188 }
189
190 }