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 "jvmti.h"
  27 #include "agent_common.h"
  28 #include "jni_tools.h"
  29 #include "jvmti_tools.h"
  30 
  31 extern "C" {
  32 
  33 #define PASSED  0
  34 #define STATUS_FAILED  2
  35 
  36 /* ============================================================================= */
  37 
  38 static jlong timeout = 0;
  39 static const char* segment = NULL;
  40 static const char* EXP_CLASS_SIGNATURE = "Lnsk/jvmti/scenarios/general_functions/GF04/gf04t001;";
  41 static jrawMonitorID countLock;
  42 static jboolean classLoadReceived = JNI_FALSE, classPrepareReceived = JNI_FALSE;
  43 static jint result = PASSED;
  44 
  45 /* ============================================================================= */
  46 
  47 /**
  48  * Add segment to bootstrap classloader path.
  49  * @returns NSK_FALSE if any error occured.
  50  */
  51 static int addSegment(jvmtiEnv* jvmti, const char segment[], const char where[]) {
  52     void* storage = NULL;
  53 
  54     NSK_DISPLAY1("Add segment: %s\n", segment);
  55     if (!NSK_JVMTI_VERIFY(
  56             NSK_CPP_STUB2(AddToBootstrapClassLoaderSearch, jvmti, segment))) {
  57         return NSK_FALSE;
  58     }
  59     NSK_DISPLAY0("  ... added\n");
  60 
  61     return NSK_TRUE;
  62 }
  63 
  64 static void setupLock(jvmtiEnv *jvmti_env, JNIEnv *jni_env) {
  65     if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB2(RawMonitorEnter,
  66             jvmti_env, countLock)))
  67         NSK_CPP_STUB2(FatalError, jni_env,
  68                 "failed to enter a raw monitor\n");
  69 }
  70 
  71 static void setoffLock(jvmtiEnv *jvmti_env, JNIEnv *jni_env) {
  72     if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB2(RawMonitorExit,
  73         jvmti_env, countLock)))
  74         NSK_CPP_STUB2(FatalError, jni_env,
  75                 "failed to exit a raw monitor\n");
  76 }
  77 
  78 JNIEXPORT jint JNICALL
  79 Java_nsk_jvmti_scenarios_general_1functions_GF04_gf04t001_check(
  80         JNIEnv *env, jobject obj) {
  81     if (result == PASSED && classLoadReceived == JNI_TRUE && classPrepareReceived == JNI_TRUE) {
  82         return PASSED;
  83     }
  84     return STATUS_FAILED;
  85 }
  86 
  87 /* ============================================================================= */
  88 
  89 /** callback for ClassLoad event **/
  90 void JNICALL
  91 ClassLoad(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread, jclass klass) {
  92     char *sig, *generic;
  93 
  94     setupLock(jvmti_env, env);
  95 
  96     if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB4(GetClassSignature,
  97             jvmti_env, klass, &sig, &generic))) {
  98         result = STATUS_FAILED;
  99     }
 100 
 101     if (strcmp(sig, EXP_CLASS_SIGNATURE) == 0) {
 102         NSK_DISPLAY1("CHECK PASSED: ClassLoad event received for the class \"%s\" as expected\n",
 103             sig);
 104         classLoadReceived = JNI_TRUE;
 105 
 106         if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB4(SetEventNotificationMode,
 107                 jvmti_env, JVMTI_DISABLE, JVMTI_EVENT_CLASS_LOAD, NULL))) {
 108             result = STATUS_FAILED;
 109         } else {
 110             NSK_DISPLAY0("ClassLoad event disabled\n");
 111         }
 112     }
 113 
 114     setoffLock(jvmti_env, env);
 115 }
 116 
 117 /** callback for ClassPrepare event **/
 118 void JNICALL
 119 ClassPrepare(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread, jclass klass) {
 120     char *sig, *generic;
 121 
 122     setupLock(jvmti_env, env);
 123 
 124     if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB4(GetClassSignature,
 125             jvmti_env, klass, &sig, &generic))) {
 126         result = STATUS_FAILED;
 127     }
 128 
 129     if (strcmp(sig, EXP_CLASS_SIGNATURE) == 0) {
 130         NSK_DISPLAY1("CHECK PASSED: ClassPrepare event received for the class \"%s\" as expected\n",
 131             sig);
 132         classPrepareReceived = JNI_TRUE;
 133 
 134         if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB4(SetEventNotificationMode,
 135                 jvmti_env, JVMTI_DISABLE, JVMTI_EVENT_CLASS_PREPARE, NULL))) {
 136             result = STATUS_FAILED;
 137         } else {
 138             NSK_DISPLAY0("ClassPrepare event disabled\n");
 139         }
 140     }
 141 
 142     setoffLock(jvmti_env, env);
 143 }
 144 
 145 /* ============================================================================= */
 146 
 147 /** Agent library initialization. */
 148 #ifdef STATIC_BUILD
 149 JNIEXPORT jint JNICALL Agent_OnLoad_gf04t001(JavaVM *jvm, char *options, void *reserved) {
 150     return Agent_Initialize(jvm, options, reserved);
 151 }
 152 JNIEXPORT jint JNICALL Agent_OnAttach_gf04t001(JavaVM *jvm, char *options, void *reserved) {
 153     return Agent_Initialize(jvm, options, reserved);
 154 }
 155 JNIEXPORT jint JNI_OnLoad_gf04t001(JavaVM *jvm, char *options, void *reserved) {
 156     return JNI_VERSION_1_8;
 157 }
 158 #endif
 159 jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
 160     jvmtiEnv* jvmti = NULL;
 161 
 162     if (!NSK_VERIFY(nsk_jvmti_parseOptions(options)))
 163         return JNI_ERR;
 164 
 165     timeout = nsk_jvmti_getWaitTime() * 60 * 1000;
 166 
 167     segment = nsk_jvmti_findOptionStringValue("segment", NULL);
 168     if (!NSK_VERIFY(segment != NULL))
 169         return JNI_ERR;
 170 
 171     if (!NSK_VERIFY((jvmti =
 172             nsk_jvmti_createJVMTIEnv(jvm, reserved)) != NULL))
 173         return JNI_ERR;
 174 
 175     if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB3(CreateRawMonitor,
 176             jvmti, "eventLock", &countLock)))
 177         return JNI_ERR;
 178 
 179     NSK_DISPLAY0("Add bootstrap class load segment in Agent_OnLoad()\n");
 180     if (!addSegment(jvmti, segment, "Agent_OnLoad()")) {
 181         return JNI_ERR;
 182     }
 183 
 184     NSK_DISPLAY0("Setting callbacks for events:\n");
 185     {
 186         jvmtiEventCallbacks callbacks;
 187         jint size = (jint)sizeof(callbacks);
 188 
 189         memset(&callbacks, 0, sizeof(callbacks));
 190         callbacks.ClassLoad = &ClassLoad;
 191         callbacks.ClassPrepare = &ClassPrepare;
 192         if (!NSK_JVMTI_VERIFY(
 193                 NSK_CPP_STUB3(SetEventCallbacks, jvmti, &callbacks, size))) {
 194             return JNI_ERR;
 195         }
 196     }
 197     NSK_DISPLAY0("  ... set\n");
 198 
 199     NSK_DISPLAY0("Enabling events: \n");
 200     if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB4(SetEventNotificationMode,
 201             jvmti, JVMTI_ENABLE, JVMTI_EVENT_CLASS_LOAD, NULL))) {
 202         return JNI_ERR;
 203     } else {
 204         NSK_DISPLAY0("  ... ClassLoad enabled\n");
 205     }
 206     if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB4(SetEventNotificationMode,
 207             jvmti, JVMTI_ENABLE, JVMTI_EVENT_CLASS_PREPARE, NULL))) {
 208         return JNI_ERR;
 209     } else {
 210         NSK_DISPLAY0("  ... ClassPrepare enabled\n");
 211     }
 212 
 213     return JNI_OK;
 214 }
 215 
 216 /* ============================================================================= */
 217 
 218 }