1 /*
2 * Copyright (c) 2004, 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 <string.h>
25 #include "jvmti.h"
26 #include "agent_common.h"
27 #include "jni_tools.h"
28 #include "jvmti_tools.h"
29
30 extern "C" {
31
32 /* scaffold objects */
33 static jvmtiEnv *jvmti = NULL;
34 static jlong timeout = 0;
35
36 #define TESTED_CLASS_NAME "nsk/jvmti/scenarios/bcinstr/BI01/bi01t002a"
37 #define TOTAL_INSTRUMENTED_CLASSES 2
38
39 static int clsLoadedIdx=0;
40 static jint newClassSize[TOTAL_INSTRUMENTED_CLASSES];
41 static unsigned char* newClassBytes[TOTAL_INSTRUMENTED_CLASSES];
42 static jvmtiClassDefinition oldClassDef[TOTAL_INSTRUMENTED_CLASSES];
43
44 /* ============================================================================= */
45 /*
46 * Class: nsk_jvmti_scenarios_bcinstr_BI01_bi01t002
47 * Method: setNewByteCode
48 * Signature: (I[B)Z
49 */
50 JNIEXPORT jboolean JNICALL
51 Java_nsk_jvmti_scenarios_bcinstr_BI01_bi01t002_setNewByteCode(JNIEnv *jni_env,
52 jobject o, jint ind, jbyteArray byteCode) {
53
54 jbyte* elements;
55 jboolean isCopy;
56
57 newClassSize[ind] = jni_env->GetArrayLength(byteCode);
58 if (!NSK_JNI_VERIFY(jni_env, newClassSize[ind] > 0)) {
59 nsk_jvmti_setFailStatus();
60 return NSK_FALSE;
61 }
62 NSK_DISPLAY1("\t... got array size: %d\n", newClassSize[ind]);
63
64 elements = jni_env->GetByteArrayElements(byteCode, &isCopy);
65 if (!NSK_JNI_VERIFY(jni_env, elements != NULL)) {
66 nsk_jvmti_setFailStatus();
67 return NSK_FALSE;
68 }
69 NSK_DISPLAY1("\t... got elements list: 0x%p\n", (void*)elements);
70
71 if (!NSK_JVMTI_VERIFY(jvmti->Allocate(newClassSize[ind], &newClassBytes[ind]))) {
72 nsk_jvmti_setFailStatus();
73 return NSK_FALSE;
74 }
75 NSK_DISPLAY1("\t... created bytes array: 0x%p\n", (void*)newClassBytes[ind]);
76
77 {
78 int j;
79 for (j = 0; j < newClassSize[ind]; j++)
80 newClassBytes[ind][j] = (unsigned char)elements[j];
81 }
82 NSK_DISPLAY1("\t... copied bytecode: %d bytes\n", (int)newClassSize[ind]);
83
84 NSK_DISPLAY1("\t... release elements list: 0x%p\n", (void*)elements);
85 NSK_TRACE(jni_env->ReleaseByteArrayElements(byteCode, elements, JNI_ABORT));
86 NSK_DISPLAY0("\t... released\n");
87 return NSK_TRUE;
88 }
89
90 /* ============================================================================= */
91 /*
92 * Class: nsk_jvmti_scenarios_bcinstr_BI01_bi01t002
93 * Method: setClass
94 * Signature: (ILjava/lang/Class;)V
95 */
96 JNIEXPORT void JNICALL
97 Java_nsk_jvmti_scenarios_bcinstr_BI01_bi01t002_setClass(JNIEnv *jni_env,
98 jobject o, jint ind, jclass cls) {
99
100 oldClassDef[ind].klass = (jclass) jni_env->NewGlobalRef(cls);
101 if (!NSK_JNI_VERIFY(jni_env, oldClassDef[ind].klass != NULL)) {
102 nsk_jvmti_setFailStatus();
103 }
104 }
105
106 /* ============================================================================= */
107
108 /** Callback function for ClassFileLoadHook event. */
109 JNIEXPORT void JNICALL
110 cbClassFileLoadHook(jvmtiEnv *jvmti_env, JNIEnv* jni_env,
111 jclass class_being_redefined, jobject loader, const char* name,
112 jobject protection_domain, jint class_data_len,
113 const unsigned char* class_data, jint* new_class_data_len,
114 unsigned char** new_class_data) {
115
116 if ( name == NULL || strcmp(name, TESTED_CLASS_NAME) ) {
117 return;
118 }
119
120 NSK_DISPLAY3("CLASS_FILE_LOAD_HOOK event: %s\n\treceived bytecode: 0x%p:%d\n",
121 name, (void *)class_data, class_data_len);
122 if (nsk_getVerboseMode()) {
123 nsk_printHexBytes(" ", 16, class_data_len, class_data);
124 }
125
126 {
127 /*store original byte code, it will be used to do final redefinition*/
128 int j;
129 unsigned char *arr;
130
131 oldClassDef[clsLoadedIdx].class_byte_count = class_data_len;
132 if (!NSK_JVMTI_VERIFY(jvmti_env->Allocate(class_data_len, &arr))) {
133 nsk_jvmti_setFailStatus();
134 return;
135 }
136 for (j = 0; j < class_data_len; j++) {
137 arr[j] = class_data[j];
138 }
139 oldClassDef[clsLoadedIdx].class_bytes = arr;
140 }
141
142 *new_class_data_len = newClassSize[clsLoadedIdx];
143 *new_class_data = newClassBytes[clsLoadedIdx];
144
145 NSK_DISPLAY2("Replace with new bytecode: 0x%p:%d\n",
146 (void*)newClassBytes[clsLoadedIdx],
147 (int)newClassSize[clsLoadedIdx]);
148 if (nsk_getVerboseMode()) {
149 nsk_printHexBytes(" ", 16, newClassSize[clsLoadedIdx],
150 newClassBytes[clsLoadedIdx]);
151 }
152 }
153
154 /* ============================================================================= */
155
156 /** Agent algorithm. */
157 static void JNICALL
158 agentProc(jvmtiEnv* jvmti, JNIEnv* agentJNI, void* arg) {
159
160 int i;
161
162 /*Wait for debuggee to read new byte codes nsk_jvmti_waitForSync#1*/
163 NSK_DISPLAY0("Wait for debuggee to read new byte codes nsk_jvmti_waitForSync#1\n");
164 if (!nsk_jvmti_waitForSync(timeout))
165 return;
166
167 for (clsLoadedIdx=0; clsLoadedIdx < TOTAL_INSTRUMENTED_CLASSES; clsLoadedIdx++) {
168
169 if (!nsk_jvmti_resumeSync())
170 return;
171
172 NSK_DISPLAY1("Wait for debuggee to load tested class by classLoader[%d]\n",
173 (clsLoadedIdx+1));
174 /*Wait for debuggee to load next class nsk_jvmti_waitForSync#2*/
175 if (!nsk_jvmti_waitForSync(timeout))
176 return;
177 }
178
179 if (!nsk_jvmti_resumeSync())
180 return;
181
182 /*Wait for debuggee to check instrumentation code works nsk_jvmti_waitForSync#3*/
183 NSK_DISPLAY0("Wait for debuggee to check instrumentation code works nsk_jvmti_waitForSync#3\n");
184 if (!nsk_jvmti_waitForSync(timeout))
185 return;
186
187 NSK_DISPLAY0("Notification disabled for CLASS_FILE_LOAD_HOOK event\n");
188 if (!NSK_JVMTI_VERIFY(jvmti->SetEventNotificationMode(JVMTI_DISABLE,
189 JVMTI_EVENT_CLASS_FILE_LOAD_HOOK,
190 NULL))) {
191 nsk_jvmti_setFailStatus();
192 return;
193 }
194
195 if (!nsk_jvmti_resumeSync())
196 return;
197
198 /*Wait for debuggee to set classes to be redefined nsk_jvmti_waitForSync#4*/
199 NSK_DISPLAY0("Wait for debuggee to set classes to be redefined nsk_jvmti_waitForSync#4\n");
200 if (!nsk_jvmti_waitForSync(timeout))
201 return;
202
203 NSK_DISPLAY0("Redfine class with old byte code\n");
204 for (i = 0; i < TOTAL_INSTRUMENTED_CLASSES; i++) {
205 NSK_DISPLAY4("class definition %d:\n\t0x%p, 0x%p:%d\n",
206 i,
207 oldClassDef[i].klass,
208 oldClassDef[i].class_bytes,
209 oldClassDef[i].class_byte_count);
210 if (nsk_getVerboseMode()) {
211 nsk_printHexBytes(" ", 16, oldClassDef[i].class_byte_count,
212 oldClassDef[i].class_bytes);
213 }
214 }
215 if (!NSK_JVMTI_VERIFY(jvmti->RedefineClasses(TOTAL_INSTRUMENTED_CLASSES, oldClassDef))) {
216 nsk_jvmti_setFailStatus();
217 return;
218 }
219
220 if (!nsk_jvmti_resumeSync())
221 return;
222
223 /*Wait for debuggee to check old byte code works nsk_jvmti_waitForSync#5*/
224 NSK_DISPLAY0("Wait for debuggee to check old byte code works nsk_jvmti_waitForSync#5\n");
225 if (!nsk_jvmti_waitForSync(timeout))
226 return;
227
228 for (i = 0; i < TOTAL_INSTRUMENTED_CLASSES; i++) {
229 agentJNI->DeleteGlobalRef(oldClassDef[i].klass);
230 }
231
232 NSK_DISPLAY0("Let debuggee to finish\n");
233 if (!nsk_jvmti_resumeSync())
234 return;
235
236 }
237
238 /* ============================================================================= */
239
240 /** Agent library initialization. */
241 #ifdef STATIC_BUILD
242 JNIEXPORT jint JNICALL Agent_OnLoad_bi01t002(JavaVM *jvm, char *options, void *reserved) {
243 return Agent_Initialize(jvm, options, reserved);
244 }
245 JNIEXPORT jint JNICALL Agent_OnAttach_bi01t002(JavaVM *jvm, char *options, void *reserved) {
246 return Agent_Initialize(jvm, options, reserved);
247 }
248 JNIEXPORT jint JNI_OnLoad_bi01t002(JavaVM *jvm, char *options, void *reserved) {
249 return JNI_VERSION_1_8;
250 }
251 #endif
252 jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
253
254 if (!NSK_VERIFY(nsk_jvmti_parseOptions(options)))
255 return JNI_ERR;
256
257 timeout = nsk_jvmti_getWaitTime() * 60 * 1000;
258
259 jvmti = nsk_jvmti_createJVMTIEnv(jvm, reserved);
260 if (!NSK_VERIFY(jvmti != NULL))
261 return JNI_ERR;
262
263 {
264 jvmtiCapabilities caps;
265 memset(&caps, 0, sizeof(caps));
266
267 caps.can_redefine_classes = 1;
268 if (!NSK_JVMTI_VERIFY(jvmti->AddCapabilities(&caps)))
269 return JNI_ERR;
270 }
271
272 NSK_DISPLAY0("Set callback for CLASS_FILE_LOAD_HOOK event\n");
273 {
274 jvmtiEventCallbacks callbacks;
275 jint size = (jint)sizeof(callbacks);
276
277 memset(&callbacks, 0, size);
278 callbacks.ClassFileLoadHook = cbClassFileLoadHook;
279 if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&callbacks, size))) {
280 return JNI_ERR;
281 }
282 }
283
284 NSK_DISPLAY0("Set notification enabled for CLASS_FILE_LOAD_HOOK event\n");
285 if (!NSK_JVMTI_VERIFY(jvmti->SetEventNotificationMode(JVMTI_ENABLE,
286 JVMTI_EVENT_CLASS_FILE_LOAD_HOOK,
287 NULL))) {
288 nsk_jvmti_setFailStatus();
289 return NSK_FALSE;
290 }
291
292 if (!NSK_VERIFY(nsk_jvmti_setAgentProc(agentProc, NULL)))
293 return JNI_ERR;
294
295 return JNI_OK;
296 }
297
298 /* ============================================================================= */
299
300
301 }