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 "ExceptionCheckingJniEnv.hpp"
28 #include "jni_tools.h"
29 #include "jvmti_tools.h"
30
31 extern "C" {
32
33 /* scaffold objects */
34 static jvmtiEnv *jvmti = NULL;
35 static jlong timeout = 0;
36
37 #define TESTED_CLASS_NAME "nsk/jvmti/scenarios/bcinstr/BI01/bi01t001a"
38
39 static jint newClassSize;
40 static unsigned char* newClassBytes;
41 static jvmtiClassDefinition oldClassDef;
42
43 /* ============================================================================= */
44 /*
45 * Class: nsk_jvmti_scenarios_bcinstr_BI01_bi01t001
46 * Method: setNewByteCode
47 * Signature: ([B)Z
48 */
49 JNIEXPORT jboolean JNICALL
50 Java_nsk_jvmti_scenarios_bcinstr_BI01_bi01t001_setNewByteCode(JNIEnv *jni,
51 jobject o,
52 jbyteArray byteCode) {
53 ExceptionCheckingJniEnvPtr jni_env(jni);
54 jbyte* elements;
55 jboolean isCopy;
56
57 newClassSize = jni_env->GetArrayLength(byteCode, TRACE_JNI_CALL);
58 if (newClassSize <= 0) {
59 nsk_jvmti_setFailStatus();
60 return NSK_FALSE;
61 }
62 NSK_DISPLAY1("\t... got array size: %d\n", newClassSize);
63
64 elements = jni_env->GetByteArrayElements(byteCode, &isCopy, TRACE_JNI_CALL);
65 NSK_DISPLAY1("\t... got elements list: 0x%p\n", (void*)elements);
66
67 if (!NSK_JVMTI_VERIFY(jvmti->Allocate(newClassSize, &newClassBytes))) {
68 nsk_jvmti_setFailStatus();
69 return NSK_FALSE;
70 }
71 NSK_DISPLAY1("\t... created bytes array: 0x%p\n", (void*)newClassBytes);
72
73 {
74 int j;
75 for (j = 0; j < newClassSize; j++)
76 newClassBytes[j] = (unsigned char)elements[j];
77 }
78 NSK_DISPLAY1("\t... copied bytecode: %d bytes\n", (int)newClassSize);
79
80 NSK_DISPLAY1("\t... release elements list: 0x%p\n", (void*)elements);
81 jni_env->ReleaseByteArrayElements(byteCode, elements, JNI_ABORT, TRACE_JNI_CALL);
82 NSK_DISPLAY0("\t... released\n");
83 return NSK_TRUE;
84 }
85
86 /* ============================================================================= */
87 /*
88 * Class: nsk_jvmti_scenarios_bcinstr_BI01_bi01t001
89 * Method: setClass
90 * Signature: (Ljava/lang/Class;)V
91 */
92 JNIEXPORT void JNICALL
93 Java_nsk_jvmti_scenarios_bcinstr_BI01_bi01t001_setClass(JNIEnv *jni,
94 jobject o, jclass cls) {
95 ExceptionCheckingJniEnvPtr jni_env(jni);
96 oldClassDef.klass = (jclass) jni_env->NewGlobalRef(cls, TRACE_JNI_CALL);
97 }
98
99 /* ============================================================================= */
100
101 /** Callback function for ClassFileLoadHook event. */
102 JNIEXPORT void JNICALL
103 cbClassFileLoadHook(jvmtiEnv *jvmti_env, JNIEnv* jni_env,
104 jclass class_being_redefined, jobject loader, const char* name,
105 jobject protection_domain, jint class_data_len,
106 const unsigned char* class_data, jint* new_class_data_len,
107 unsigned char** new_class_data) {
108
109 if (name == NULL || strcmp(name, TESTED_CLASS_NAME)) {
110 return;
111 }
112
113 NSK_DISPLAY3("CLASS_FILE_LOAD_HOOK event: %s\n\treceived bytecode: 0x%p:%d\n",
114 name, (void *)class_data, class_data_len);
115 if (nsk_getVerboseMode()) {
116 nsk_printHexBytes(" ", 16, class_data_len, class_data);
117 }
118
119 {
120 /*store original byte code, it will be used to do final redefinition*/
121 int j;
122 unsigned char *arr;
123
124 oldClassDef.class_byte_count = class_data_len;
125 if (!NSK_JVMTI_VERIFY(jvmti_env->Allocate(class_data_len, &arr))) {
126 nsk_jvmti_setFailStatus();
127 return;
128 }
129 for (j = 0; j < class_data_len; j++) {
130 arr[j] = class_data[j];
131 }
132 oldClassDef.class_bytes = arr;
133 }
134
135 *new_class_data_len = newClassSize;
136 *new_class_data = newClassBytes;
137
138 NSK_DISPLAY2("Replace with new bytecode: 0x%p:%d\n",
139 (void*)newClassBytes,
140 (int)newClassSize);
141 if (nsk_getVerboseMode()) {
142 nsk_printHexBytes(" ", 16, newClassSize,
143 newClassBytes);
144 }
145 }
146
147 /* ============================================================================= */
148
149 /** Agent algorithm. */
150 static void JNICALL
151 agentProc(jvmtiEnv* jvmti, JNIEnv* agentJNI, void* arg) {
152 ExceptionCheckingJniEnvPtr jni(agentJNI);
153
154 /*Wait for debuggee to read new byte codes nsk_jvmti_waitForSync#1*/
155 NSK_DISPLAY0("Wait for debuggee to read new byte codes nsk_jvmti_waitForSync#1\n");
156 if (!nsk_jvmti_waitForSync(timeout))
157 return;
158
159 if (!nsk_jvmti_resumeSync())
160 return;
161
162 NSK_DISPLAY0("Wait for debuggee to load tested class by classLoader\n");
163 /*Wait for debuggee to load next class nsk_jvmti_waitForSync#2*/
164 if (!nsk_jvmti_waitForSync(timeout))
165 return;
166
167 if (!nsk_jvmti_resumeSync())
168 return;
169
170 /*Wait for debuggee to check instrumentation code works nsk_jvmti_waitForSync#3*/
171 NSK_DISPLAY0("Wait for debuggee to check instrumentation code works nsk_jvmti_waitForSync#3\n");
172 if (!nsk_jvmti_waitForSync(timeout))
173 return;
174
175 NSK_DISPLAY0("Notification disabled for CLASS_FILE_LOAD_HOOK event\n");
176 if (!NSK_JVMTI_VERIFY(jvmti->SetEventNotificationMode(JVMTI_DISABLE,
177 JVMTI_EVENT_CLASS_FILE_LOAD_HOOK,
178 NULL))) {
179 nsk_jvmti_setFailStatus();
180 return;
181 }
182
183 if (!nsk_jvmti_resumeSync())
184 return;
185
186 /*Wait for debuggee to set classes to be redefined nsk_jvmti_waitForSync#4*/
187 NSK_DISPLAY0("Wait for debuggee to set classes to be redefined nsk_jvmti_waitForSync#4\n");
188 if (!nsk_jvmti_waitForSync(timeout))
189 return;
190
191 NSK_DISPLAY0("Redfine class with old byte code\n");
192 NSK_DISPLAY3("class definition:\n\t0x%p, 0x%p:%d\n",
193 oldClassDef.klass,
194 oldClassDef.class_bytes,
195 oldClassDef.class_byte_count);
196 if (nsk_getVerboseMode()) {
197 nsk_printHexBytes(" ", 16, oldClassDef.class_byte_count,
198 oldClassDef.class_bytes);
199 }
200 if (!NSK_JVMTI_VERIFY(jvmti->RedefineClasses(1, &oldClassDef))) {
201 nsk_jvmti_setFailStatus();
202 return;
203 }
204
205 if (!nsk_jvmti_resumeSync())
206 return;
207
208 /*Wait for debuggee to check old byte code works nsk_jvmti_waitForSync#5*/
209 NSK_DISPLAY0("Wait for debuggee to check old byte code works nsk_jvmti_waitForSync#5\n");
210 if (!nsk_jvmti_waitForSync(timeout))
211 return;
212
213 jni->DeleteGlobalRef(oldClassDef.klass, TRACE_JNI_CALL);
214
215 NSK_DISPLAY0("Let debuggee to finish\n");
216 if (!nsk_jvmti_resumeSync())
217 return;
218
219 }
220
221 /* ============================================================================= */
222
223 /** Agent library initialization. */
224 #ifdef STATIC_BUILD
225 JNIEXPORT jint JNICALL Agent_OnLoad_bi01t001(JavaVM *jvm, char *options, void *reserved) {
226 return Agent_Initialize(jvm, options, reserved);
227 }
228 JNIEXPORT jint JNICALL Agent_OnAttach_bi01t001(JavaVM *jvm, char *options, void *reserved) {
229 return Agent_Initialize(jvm, options, reserved);
230 }
231 JNIEXPORT jint JNI_OnLoad_bi01t001(JavaVM *jvm, char *options, void *reserved) {
232 return JNI_VERSION_1_8;
233 }
234 #endif
235 jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
236
237 if (!NSK_VERIFY(nsk_jvmti_parseOptions(options)))
238 return JNI_ERR;
239
240 timeout = nsk_jvmti_getWaitTime() * 60 * 1000;
241
242 jvmti = nsk_jvmti_createJVMTIEnv(jvm, reserved);
243 if (!NSK_VERIFY(jvmti != NULL))
244 return JNI_ERR;
245
246 {
247 jvmtiCapabilities caps;
248 memset(&caps, 0, sizeof(caps));
249
250 caps.can_redefine_classes = 1;
251 if (!NSK_JVMTI_VERIFY(jvmti->AddCapabilities(&caps)))
252 return JNI_ERR;
253 }
254
255 NSK_DISPLAY0("Set callback for CLASS_FILE_LOAD_HOOK event\n");
256 {
257 jvmtiEventCallbacks callbacks;
258 jint size = (jint)sizeof(callbacks);
259
260 memset(&callbacks, 0, size);
261 callbacks.ClassFileLoadHook = cbClassFileLoadHook;
262 if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&callbacks, size))) {
263 return JNI_ERR;
264 }
265 }
266
267 NSK_DISPLAY0("Set notification enabled for CLASS_FILE_LOAD_HOOK event\n");
268 if (!NSK_JVMTI_VERIFY(jvmti->SetEventNotificationMode(JVMTI_ENABLE,
269 JVMTI_EVENT_CLASS_FILE_LOAD_HOOK,
270 NULL))) {
271 nsk_jvmti_setFailStatus();
272 return NSK_FALSE;
273 }
274
275 if (!NSK_VERIFY(nsk_jvmti_setAgentProc(agentProc, NULL)))
276 return JNI_ERR;
277
278 return JNI_OK;
279 }
280
281 /* ============================================================================= */
282
283
284 }