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 <stdlib.h>
25 #include <string.h>
26 #include "jni_tools.h"
27 #include "agent_common.h"
28 #include "jvmti_tools.h"
29
30 #define PASSED 0
31 #define STATUS_FAILED 2
32
33 extern "C" {
34
35 /* ========================================================================== */
36
37 /* scaffold objects */
38 static jlong timeout = 0;
39
40 /* test objects */
41 static jint klass_byte_count = 0;
42 static unsigned char *klass_bytes = NULL;
43 static int ClassFileLoadHookEventFlag = NSK_FALSE;
44
45 const char* CLASS_NAME = "nsk/jvmti/scenarios/multienv/MA07/ma07t001a";
46 static const jint magicNumber_1 = 0x12345678;
47 static const jint magicNumber_2 = (jint)0x87654321;
48 static const unsigned char newMagicNumber = 0x1;
49
50 /* ========================================================================== */
51
52 /** callback functions **/
53
54 static void JNICALL
55 ClassFileLoadHook(jvmtiEnv *jvmti_env, JNIEnv *jni_env,
56 jclass class_being_redefined, jobject loader,
57 const char* name, jobject protection_domain,
58 jint class_data_len, const unsigned char* class_data,
59 jint *new_class_data_len, unsigned char** new_class_data) {
60 int found_1 = NSK_FALSE;
61 int found_2 = NSK_FALSE;
62 jint magicIndex = 0;
63 jint i;
64
65 if (name != NULL && (strcmp(name, CLASS_NAME) == 0)) {
66 ClassFileLoadHookEventFlag = NSK_TRUE;
67 NSK_DISPLAY0("ClassFileLoadHook event\n");
68
69 if (!NSK_VERIFY(class_being_redefined == NULL)) {
70 nsk_jvmti_setFailStatus();
71 return;
72 }
73
74 if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB3(Allocate,
75 jvmti_env, class_data_len, &klass_bytes)))
76 nsk_jvmti_setFailStatus();
77
78 else {
79 memcpy(klass_bytes, class_data, class_data_len);
80 klass_byte_count = class_data_len;
81
82 for (i = 0; i < klass_byte_count - 3; i++) {
83 if (((jint)klass_bytes[i+3] |
84 ((jint)klass_bytes[i+2] << 8) |
85 ((jint)klass_bytes[i+1] << 16) |
86 ((jint)klass_bytes[i] << 24)) == magicNumber_1) {
87 NSK_DISPLAY2("index of 0x%x: %d\n", magicNumber_1, i);
88 found_1 = NSK_TRUE;
89 } else if (((jint)klass_bytes[i+3] |
90 ((jint)klass_bytes[i+2] << 8) |
91 ((jint)klass_bytes[i+1] << 16) |
92 ((jint)klass_bytes[i] << 24)) == magicNumber_2) {
93 NSK_DISPLAY2("index of 0x%x: %d\n", magicNumber_2, i);
94 magicIndex = i;
95 found_2 = NSK_TRUE;
96 }
97 }
98
99 if (!NSK_VERIFY(!found_1)) {
100 NSK_COMPLAIN1("magic number 0x%x unexpectedly found\n",
101 magicNumber_1);
102 nsk_jvmti_setFailStatus();
103 }
104
105 if (!NSK_VERIFY(found_2)) {
106 NSK_COMPLAIN1("magic number 0x%x not found\n", magicNumber_2);
107 nsk_jvmti_setFailStatus();
108 }
109
110 if (found_2) {
111 NSK_DISPLAY1("Instrumenting with %d\n", newMagicNumber);
112 klass_bytes[magicIndex] = 0;
113 klass_bytes[magicIndex+1] = 0;
114 klass_bytes[magicIndex+2] = 0;
115 klass_bytes[magicIndex+3] = newMagicNumber;
116 *new_class_data = klass_bytes;
117 *new_class_data_len = klass_byte_count;
118 }
119 }
120 }
121 }
122
123 /* ========================================================================== */
124
125 /** Agent algorithm. */
126 static void JNICALL
127 agentProc(jvmtiEnv* jvmti, JNIEnv* jni, void* arg) {
128
129 if (!nsk_jvmti_waitForSync(timeout))
130 return;
131
132 if (!NSK_VERIFY(ClassFileLoadHookEventFlag)) {
133 NSK_COMPLAIN0("Missing ClassFileLoadHook event\n");
134 nsk_jvmti_setFailStatus();
135 }
136
137 if (!nsk_jvmti_resumeSync())
138 return;
139 }
140
141 /* ========================================================================== */
142
143 /** Agent library initialization. */
144 #ifdef STATIC_BUILD
145 JNIEXPORT jint JNICALL Agent_OnLoad_ma07t001a(JavaVM *jvm, char *options, void *reserved) {
146 return Agent_Initialize(jvm, options, reserved);
147 }
148 JNIEXPORT jint JNICALL Agent_OnAttach_ma07t001a(JavaVM *jvm, char *options, void *reserved) {
149 return Agent_Initialize(jvm, options, reserved);
150 }
151 JNIEXPORT jint JNI_OnLoad_ma07t001a(JavaVM *jvm, char *options, void *reserved) {
152 return JNI_VERSION_1_8;
153 }
154 #endif
155 jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
156 jvmtiEnv* jvmti = NULL;
157 jvmtiEventCallbacks callbacks;
158
159 NSK_DISPLAY0("Agent_OnLoad\n");
160
161 if (!NSK_VERIFY(nsk_jvmti_parseOptions(options)))
162 return JNI_ERR;
163
164 timeout = nsk_jvmti_getWaitTime() * 60 * 1000;
165
166 if (!NSK_VERIFY((jvmti =
167 nsk_jvmti_createJVMTIEnv(jvm, reserved)) != NULL))
168 return JNI_ERR;
169
170 if (!NSK_VERIFY(nsk_jvmti_setAgentProc(agentProc, NULL)))
171 return JNI_ERR;
172
173 memset(&callbacks, 0, sizeof(callbacks));
174 callbacks.ClassFileLoadHook = &ClassFileLoadHook;
175 if (!NSK_VERIFY(nsk_jvmti_init_MA(&callbacks)))
176 return JNI_ERR;
177
178 if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB4(SetEventNotificationMode,
179 jvmti, JVMTI_ENABLE, JVMTI_EVENT_CLASS_FILE_LOAD_HOOK, NULL)))
180 return JNI_ERR;
181
182 return JNI_OK;
183 }
184
185 /* ========================================================================== */
186
187 }