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 jlong timeout = 0;
34
35 #define PATH_TO_NEW_BYTECODE "pathToNewByteCode"
36 #define TESTED_CLASS_NAME "java/lang/Object"
37
38 static jint newClassSize;
39 static unsigned char* newClassBytes;
40
41 static jvmtiClassDefinition classDef;
42
43 /* ============================================================================= */
44
45 int readNewBytecode(jvmtiEnv* jvmti) {
46
47 char filename[256];
48 FILE *bytecode;
49 const char *pathToByteCode = nsk_jvmti_findOptionValue(PATH_TO_NEW_BYTECODE);
50 jint read_bytes;
51
52 if (pathToByteCode)
53 sprintf(filename,"%s/%s/%s.class",
54 pathToByteCode, "newclass02", TESTED_CLASS_NAME);
55 else
56 sprintf(filename,"%s/%s.class",
57 "newclass02", TESTED_CLASS_NAME);
58
59 NSK_DISPLAY1("Reading new bytecode for java.lang.Object\n\tfile name: %s\n",
60 filename);
61
62 bytecode = fopen(filename, "rb");
63 if (bytecode == NULL) {
64 NSK_COMPLAIN0("error opening file\n");
65 return NSK_FALSE;
66 }
67
68 fseek(bytecode, 0, SEEK_END);
69 classDef.class_byte_count = ftell(bytecode);
70 rewind(bytecode);
71
72 if (!NSK_JVMTI_VERIFY(jvmti->Allocate(classDef.class_byte_count, &newClassBytes))) {
73 NSK_COMPLAIN0("buffer couldn't be allocated\n");
74 return NSK_FALSE;
75 }
76 classDef.class_bytes = newClassBytes;
77 read_bytes = (jint) fread(newClassBytes, 1,
78 classDef.class_byte_count, bytecode);
79 fclose(bytecode);
80 if (read_bytes != classDef.class_byte_count) {
81 NSK_COMPLAIN0("error reading file\n");
82 return NSK_FALSE;
83 }
84
85 return NSK_TRUE;
86 }
87
88 /* ============================================================================= */
89
90 /** Agent algorithm. */
91 static void JNICALL
92 agentProc(jvmtiEnv* jvmti, JNIEnv* jni, void* arg) {
93
94 /*Wait for debuggee to set classes to be redefined nsk_jvmti_waitForSync#4*/
95 NSK_DISPLAY0("Wait for debuggee to set classes to be redefined nsk_jvmti_waitForSync#4\n");
96 if (!nsk_jvmti_waitForSync(timeout))
97 return;
98
99 NSK_DISPLAY1("Find class: %s\n", TESTED_CLASS_NAME);
100 if (!NSK_JNI_VERIFY(jni, (classDef.klass = jni->FindClass(TESTED_CLASS_NAME)) != NULL)) {
101 nsk_jvmti_setFailStatus();
102 return;
103 }
104
105 if (!NSK_JNI_VERIFY(jni, (classDef.klass = (jclass)
106 jni->NewGlobalRef(classDef.klass)) != NULL)) {
107 nsk_jvmti_setFailStatus();
108 return;
109 }
110
111 NSK_DISPLAY0("Redfine class with new byte code\n");
112 NSK_DISPLAY3("class definition:\n\t0x%p, 0x%p:%d\n",
113 classDef.klass,
114 classDef.class_bytes,
115 classDef.class_byte_count);
116 if (nsk_getVerboseMode()) {
117 nsk_printHexBytes(" ", 16, classDef.class_byte_count,
118 classDef.class_bytes);
119 }
120 if (!NSK_JVMTI_VERIFY(jvmti->RedefineClasses(1, &classDef))) {
121 nsk_jvmti_setFailStatus();
122 return;
123 }
124
125 jni->DeleteGlobalRef(classDef.klass);
126
127 if (!nsk_jvmti_resumeSync())
128 return;
129 }
130
131 /* ============================================================================= */
132
133 /** Agent library initialization. */
134 #ifdef STATIC_BUILD
135 JNIEXPORT jint JNICALL Agent_OnLoad_bi04t002(JavaVM *jvm, char *options, void *reserved) {
136 return Agent_Initialize(jvm, options, reserved);
137 }
138 JNIEXPORT jint JNICALL Agent_OnAttach_bi04t002(JavaVM *jvm, char *options, void *reserved) {
139 return Agent_Initialize(jvm, options, reserved);
140 }
141 JNIEXPORT jint JNI_OnLoad_bi04t002(JavaVM *jvm, char *options, void *reserved) {
142 return JNI_VERSION_1_8;
143 }
144 #endif
145 jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
146 jvmtiEnv *jvmti = NULL;
147
148 if (!NSK_VERIFY(nsk_jvmti_parseOptions(options)))
149 return JNI_ERR;
150
151 timeout = nsk_jvmti_getWaitTime() * 60 * 1000;
152
153 if (!NSK_VERIFY((jvmti = nsk_jvmti_createJVMTIEnv(jvm, reserved)) != NULL))
154 return JNI_ERR;
155
156 {
157 jvmtiCapabilities caps;
158 memset(&caps, 0, sizeof(caps));
159
160 caps.can_redefine_classes = 1;
161 caps.can_redefine_any_class = 1;
162 if (!NSK_JVMTI_VERIFY(jvmti->AddCapabilities(&caps)))
163 return JNI_ERR;
164 }
165
166 if (!NSK_VERIFY(readNewBytecode(jvmti)))
167 return JNI_ERR;
168
169 if (!NSK_VERIFY(nsk_jvmti_setAgentProc(agentProc, NULL)))
170 return JNI_ERR;
171
172 return JNI_OK;
173 }
174
175 /* ============================================================================= */
176
177
178 }