libAddModuleReadsTest.c revision 12723:afedee84773e 
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
29extern "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
49static const char *EXC_CNAME = "java/lang/Exception";
50static const char* MOD_CNAME = "Ljava/lang/Module;";
51
52static jvmtiEnv *jvmti = NULL;
53static jint result = PASSED;
54
55static jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved);
56
57JNIEXPORT
58jint JNICALL Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
59    return Agent_Initialize(jvm, options, reserved);
60}
61
62JNIEXPORT
63jint JNICALL Agent_OnAttach(JavaVM *jvm, char *options, void *reserved) {
64    return Agent_Initialize(jvm, options, reserved);
65}
66
67JNIEXPORT
68jint JNICALL JNI_OnLoad(JavaVM *jvm, void *reserved) {
69    return JNI_VERSION_1_8;
70}
71
72static
73jint 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
83static
84void 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
98static
99jclass 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
109jmethodID
110get_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
120static
121jboolean 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
134static
135jint 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
248JNIEXPORT jint JNICALL
249Java_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