1 /*
2 * Copyright (c) 2016, 2017, 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
28 #ifdef __cplusplus
29 extern "C" {
30 #endif
31
32 #ifndef JNI_ENV_ARG
33
34 #ifdef __cplusplus
35 #define JNI_ENV_ARG(x, y) y
36 #define JNI_ENV_PTR(x) x
37 #else
38 #define JNI_ENV_ARG(x,y) x, y
39 #define JNI_ENV_PTR(x) (*x)
40 #endif
41
42 #endif
43
44 #define TranslateError(err) "JVMTI error"
45
46 #define PASSED 0
47 #define FAILED 2
48
49 static const char *EXC_CNAME = "java/lang/Exception";
50 static const char* MOD_CNAME = "Ljava/lang/Module;";
51
52 static jvmtiEnv *jvmti = NULL;
53 static jint result = PASSED;
54
55 static jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved);
56
57 JNIEXPORT
Agent_OnLoad(JavaVM * jvm,char * options,void * reserved)58 jint JNICALL Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
59 return Agent_Initialize(jvm, options, reserved);
60 }
61
62 JNIEXPORT
Agent_OnAttach(JavaVM * jvm,char * options,void * reserved)63 jint JNICALL Agent_OnAttach(JavaVM *jvm, char *options, void *reserved) {
64 return Agent_Initialize(jvm, options, reserved);
65 }
66
67 JNIEXPORT
JNI_OnLoad(JavaVM * jvm,void * reserved)68 jint JNICALL JNI_OnLoad(JavaVM *jvm, void *reserved) {
69 return JNI_VERSION_1_8;
70 }
71
72 static
Agent_Initialize(JavaVM * jvm,char * options,void * reserved)73 jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
74 jint res = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **) &jvmti),
75 JVMTI_VERSION_9);
76 if (res != JNI_OK || jvmti == NULL) {
77 printf(" Error: wrong result of a valid call to GetEnv!\n");
78 return JNI_ERR;
79 }
80 return JNI_OK;
81 }
82
83 static
throw_exc(JNIEnv * env,char * msg)84 void throw_exc(JNIEnv *env, char *msg) {
85 jclass exc_class = JNI_ENV_PTR(env)->FindClass(JNI_ENV_ARG(env, EXC_CNAME));
86 jint rt = JNI_OK;
87
88 if (exc_class == NULL) {
89 printf("throw_exc: Error in FindClass(env, %s)\n", EXC_CNAME);
90 return;
91 }
92 rt = JNI_ENV_PTR(env)->ThrowNew(JNI_ENV_ARG(env, exc_class), msg);
93 if (rt == JNI_ERR) {
94 printf("throw_exc: Error in JNI ThrowNew(env, %s)\n", msg);
95 }
96 }
97
98 static
jlM(JNIEnv * env)99 jclass jlM(JNIEnv *env) {
100 jclass cls = NULL;
101
102 cls = JNI_ENV_PTR(env)->FindClass(JNI_ENV_ARG(env, MOD_CNAME));
103 if (cls == NULL) {
104 printf(" Error in JNI FindClass: %s\n", MOD_CNAME);
105 }
106 return cls;
107 }
108
109 jmethodID
get_method(JNIEnv * env,jclass clazz,const char * name,const char * sig)110 get_method(JNIEnv *env, jclass clazz, const char * name, const char *sig) {
111 jmethodID method = NULL;
112
113 method = JNI_ENV_PTR(env)->GetMethodID(JNI_ENV_ARG(env, clazz), name, sig);
114 if (method == NULL) {
115 printf(" Error in JNI GetMethodID %s with signature %s", name, sig);
116 }
117 return method;
118 }
119
120 static
can_module_read(JNIEnv * env,jobject module,jobject to_module)121 jboolean can_module_read(JNIEnv *env, jobject module, jobject to_module) {
122 static jmethodID mCanRead = NULL;
123 jboolean res = JNI_FALSE;
124
125 if (mCanRead == NULL) {
126 const char* sign = "(Ljava/lang/Module;)Z";
127 mCanRead = get_method(env, jlM(env), "canRead", sign);
128 }
129 res = JNI_ENV_PTR(env)->CallBooleanMethod(JNI_ENV_ARG(env, module),
130 mCanRead, to_module);
131 return res;
132 }
133
134 static
check_add_module_reads(JNIEnv * env,jclass cls,jobject unnamedModule,jobject baseModule,jobject instrModule)135 jint check_add_module_reads(JNIEnv *env,
136 jclass cls,
137 jobject unnamedModule,
138 jobject baseModule,
139 jobject instrModule) {
140 jvmtiError err = JVMTI_ERROR_NONE;
141 jboolean can = JNI_FALSE;
142
143 // Add an invalid read edge from NULL module
144 printf("Check #N1:\n");
145 err = (*jvmti)->AddModuleReads(jvmti, NULL, baseModule);
146 if (err != JVMTI_ERROR_NULL_POINTER) {
147 printf("#N1: jvmtiError from AddModuleReads: %d\n", err);
148 throw_exc(env, "Check #N1: failed to return JVMTI_ERROR_NULL_POINTER for module==NULL");
149 return FAILED;
150 }
151
152 // Add an invalid read edge to NULL module
153 printf("Check #N2:\n");
154 err = (*jvmti)->AddModuleReads(jvmti, baseModule, NULL);
155 if (err != JVMTI_ERROR_NULL_POINTER) {
156 printf("#N2: jvmtiError from AddModuleReads: %d\n", err);
157 throw_exc(env, "Check #N2: failed to return JVMTI_ERROR_NULL_POINTER for to_module==NULL");
158 return FAILED;
159 }
160
161 // Add an invalid read edge from invalid module (cls)
162 printf("Check #I1:\n");
163 err = (*jvmti)->AddModuleReads(jvmti, cls, baseModule);
164 if (err != JVMTI_ERROR_INVALID_MODULE) {
165 printf("#I1: jvmtiError from AddModuleReads: %d\n", err);
166 throw_exc(env, "Check #I1: failed to return JVMTI_ERROR_INVALID_MODULE for module==cls");
167 return FAILED;
168 }
169
170 // Add an invalid read edge to invalid module (cls)
171 printf("Check #I2:\n");
172 err = (*jvmti)->AddModuleReads(jvmti, baseModule, cls);
173 if (err != JVMTI_ERROR_INVALID_MODULE) {
174 printf("#I2: jvmtiError from AddModuleReads: %d\n", err);
175 throw_exc(env, "Check #I2: failed to return JVMTI_ERROR_INVALID_MODULE for to_module==cls");
176 return FAILED;
177 }
178
179 // Check the edge baseModule->instrModule is absent
180 printf("Check #C0:\n");
181 can = can_module_read(env, baseModule, instrModule);
182 if (can != JNI_FALSE) {
183 throw_exc(env, "Check #C0: read edge from base to instr is unexpected");
184 return FAILED;
185 }
186
187 // Add read edge baseModule->instrModule
188 printf("Check #C1:\n");
189 err = (*jvmti)->AddModuleReads(jvmti, baseModule, instrModule);
190 if (err != JVMTI_ERROR_NONE) {
191 printf("#C1: jvmtiError from AddModuleReads: %d\n", err);
192 throw_exc(env, "Check #C1: error in add reads from base to instr");
193 return FAILED;
194 }
195
196 // Check the read edge baseModule->instrModule is present now
197 printf("Check #C2:\n");
198 can = can_module_read(env, baseModule, instrModule);
199 if (can == JNI_FALSE) {
200 throw_exc(env, "Check #C2: failed to add reads from base to instr");
201 return FAILED;
202 }
203
204 // Check the read edge baseModule->unnamedModule is absent
205 printf("Check #C3:\n");
206 can = can_module_read(env, baseModule, unnamedModule);
207 if (can != JNI_FALSE) {
208 throw_exc(env, "Check #C3: got unexpected read edge from base to unnamed");
209 return FAILED;
210 }
211
212 // Add read edge baseModule->unnamedModule
213 printf("Check #C4:\n");
214 err = (*jvmti)->AddModuleReads(jvmti, baseModule, unnamedModule);
215 if (err != JVMTI_ERROR_NONE) {
216 printf("#C4: jvmtiError from AddModuleReads: %d\n", err);
217 throw_exc(env, "Check #C4: failed to ignore adding read edge from base to unnamed");
218 return FAILED;
219 }
220
221 // Check the read edge baseModule->unnamedModule is present now
222 printf("Check #C5:\n");
223 can = can_module_read(env, baseModule, unnamedModule);
224 if (can == JNI_FALSE) {
225 throw_exc(env, "Check #C5: did not get expected read edge from base to unnamed");
226 return FAILED;
227 }
228
229 // Check the read edge unnamedModule->instrModule is absent
230 printf("Check #C6:\n");
231 can = can_module_read(env, unnamedModule, instrModule);
232 if (can == JNI_FALSE) {
233 throw_exc(env, "Check #C6: did not get expected read edge from unnamed to instr");
234 return FAILED;
235 }
236
237 // Add read edge unnamedModule->instrModule
238 printf("Check #C7:\n");
239 err = (*jvmti)->AddModuleReads(jvmti, unnamedModule, instrModule);
240 if (err != JVMTI_ERROR_NONE) {
241 printf("#C7: jvmtiError from AddModuleReads: %d\n", err);
242 throw_exc(env, "Check #C7: failed to ignore adding read edge from unnamed to instr");
243 return FAILED;
244 }
245 return PASSED;
246 }
247
248 JNIEXPORT jint JNICALL
Java_MyPackage_AddModuleReadsTest_check(JNIEnv * env,jclass cls,jobject unnamedModule,jobject baseModule,jobject instrModule)249 Java_MyPackage_AddModuleReadsTest_check(JNIEnv *env,
250 jclass cls,
251 jobject unnamedModule,
252 jobject baseModule,
253 jobject instrModule) {
254 if (jvmti == NULL) {
255 throw_exc(env, "JVMTI client was not properly loaded!\n");
256 return FAILED;
257 }
258
259 printf("\n*** Checks for JVMTI AddModuleReads ***\n\n");
260 result = check_add_module_reads(env, cls, unnamedModule, baseModule, instrModule);
261 if (result != PASSED) {
262 return result;
263 }
264 return result;
265 }
266
267 #ifdef __cplusplus
268 }
269 #endif
270