| /* |
| * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include "jvmti.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| #ifndef JNI_ENV_ARG |
| |
| #ifdef __cplusplus |
| #define JNI_ENV_ARG(x, y) y |
| #define JNI_ENV_PTR(x) x |
| #else |
| #define JNI_ENV_ARG(x,y) x, y |
| #define JNI_ENV_PTR(x) (*x) |
| #endif |
| |
| #endif |
| |
| #define TranslateError(err) "JVMTI error" |
| |
| #define PASSED 0 |
| #define FAILED 2 |
| |
| static const char *EXPECTED_SIGNATURE = "Ljava/util/Collections;"; |
| static const char *EXC_CNAME = "java/lang/Exception"; |
| |
| static jvmtiEnv *jvmti = NULL; |
| static jint result = PASSED; |
| static jboolean printdump = JNI_FALSE; |
| |
| static jboolean with_early_vm_start_capability = JNI_FALSE; |
| |
| static jboolean class_in_class_load_events_vm_start = JNI_FALSE; |
| static jboolean class_in_class_load_events_vm_live = JNI_FALSE; |
| static jboolean class_in_class_prepare_events_vm_start = JNI_FALSE; |
| static jboolean class_in_class_prepare_events_vm_live = JNI_FALSE; |
| |
| static int class_load_events_vm_start_count = 0; |
| static int class_prepare_events_vm_start_count = 0; |
| |
| static jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved); |
| |
| JNIEXPORT |
| jint JNICALL Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| |
| JNIEXPORT |
| jint JNICALL Agent_OnAttach(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| |
| JNIEXPORT |
| jint JNICALL JNI_OnLoad(JavaVM *jvm, void *reserved) { |
| return JNI_VERSION_9; |
| } |
| |
| static |
| jint throw_exc(JNIEnv *env, char *msg) { |
| jclass exc_class = JNI_ENV_PTR(env)->FindClass(JNI_ENV_ARG(env, EXC_CNAME)); |
| |
| if (exc_class == NULL) { |
| printf("throw_exc: Error in FindClass(env, %s)\n", EXC_CNAME); |
| return -1; |
| } |
| return JNI_ENV_PTR(env)->ThrowNew(JNI_ENV_ARG(env, exc_class), msg); |
| } |
| |
| static void JNICALL |
| Callback_ClassFileLoad(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread, jclass klass) { |
| jvmtiPhase phase; |
| char *sig, *generic; |
| jvmtiError err; |
| |
| err = (*jvmti)->GetPhase(jvmti_env,&phase); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("ClassLoad event: GetPhase error: %s (%d)\n", TranslateError(err), err); |
| result = FAILED; |
| return; |
| } |
| |
| if (phase == JVMTI_PHASE_START || phase == JVMTI_PHASE_LIVE) { |
| |
| err = (*jvmti)->GetClassSignature(jvmti_env, klass, &sig, &generic); |
| |
| if (err != JVMTI_ERROR_NONE) { |
| printf("ClassLoad event: GetClassSignature error: %s (%d)\n", TranslateError(err), err); |
| result = FAILED; |
| return; |
| } |
| |
| if (phase == JVMTI_PHASE_START) { |
| class_load_events_vm_start_count++; |
| if(strcmp(sig, EXPECTED_SIGNATURE) == 0) { |
| class_in_class_load_events_vm_start = JNI_TRUE; |
| } |
| } else { |
| if(strcmp(sig, EXPECTED_SIGNATURE) == 0) { |
| class_in_class_load_events_vm_live = JNI_TRUE; |
| } |
| } |
| |
| if (printdump == JNI_TRUE) { |
| printf(">>> ClassLoad event: phase(%d), class signature %s\n", phase, sig == NULL ? "null": sig); |
| } |
| } else { |
| printf("ClassLoad event: get event in unexpected phase(%d)\n", phase); |
| result = FAILED; |
| } |
| } |
| |
| static void JNICALL |
| Callback_ClassFilePrepare(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread, jclass klass) { |
| jvmtiPhase phase; |
| char *sig, *generic; |
| jvmtiError err; |
| |
| err = (*jvmti)->GetPhase(jvmti_env,&phase); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("ClassPrepare event: GetPhase error: %s (%d)\n", TranslateError(err), err); |
| result = FAILED; |
| return; |
| } |
| |
| if (phase == JVMTI_PHASE_START || phase == JVMTI_PHASE_LIVE) { |
| |
| err = (*jvmti)->GetClassSignature(jvmti_env, klass, &sig, &generic); |
| |
| if (err != JVMTI_ERROR_NONE) { |
| printf("ClassPrepare event: GetClassSignature error: %s (%d)\n", TranslateError(err), err); |
| result = FAILED; |
| return; |
| } |
| |
| if (phase == JVMTI_PHASE_START) { |
| class_prepare_events_vm_start_count++; |
| if(strcmp(sig, EXPECTED_SIGNATURE) == 0) { |
| class_in_class_prepare_events_vm_start = JNI_TRUE; |
| } |
| } else { |
| if(strcmp(sig, EXPECTED_SIGNATURE) == 0) { |
| class_in_class_prepare_events_vm_live = JNI_TRUE; |
| } |
| } |
| |
| if (printdump == JNI_TRUE) { |
| printf(">>> ClassPrepare event: phase(%d), class signature %s\n", phase, sig == NULL ? "null": sig); |
| } |
| } else { |
| printf("ClassPrepare event: get event in unexpected phase(%d)\n", phase); |
| result = FAILED; |
| } |
| } |
| |
| static |
| jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) { |
| jint res, size; |
| jvmtiCapabilities caps; |
| jvmtiEventCallbacks callbacks; |
| jvmtiError err; |
| |
| if (options != NULL) { |
| if (strstr(options, "with_early_vmstart") != NULL) { |
| with_early_vm_start_capability = JNI_TRUE; |
| } |
| if (strstr(options, "printdump") != NULL) { |
| printdump = JNI_TRUE; |
| } |
| } |
| |
| res = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **) &jvmti), |
| JVMTI_VERSION_9); |
| if (res != JNI_OK || jvmti == NULL) { |
| printf(" Error: wrong result of a valid call to GetEnv!\n"); |
| return JNI_ERR; |
| } |
| |
| if (with_early_vm_start_capability == JNI_TRUE) { |
| printf("Enabling following capability: can_generate_early_vmstart\n"); |
| memset(&caps, 0, sizeof(caps)); |
| caps.can_generate_early_vmstart = 1; |
| |
| err = (*jvmti)->AddCapabilities(jvmti, &caps); |
| if (err != JVMTI_ERROR_NONE) { |
| printf(" Error in AddCapabilites: %s (%d)\n", TranslateError(err), err); |
| return JNI_ERR; |
| } |
| } |
| |
| size = (jint)sizeof(callbacks); |
| |
| memset(&callbacks, 0, sizeof(callbacks)); |
| callbacks.ClassLoad = Callback_ClassFileLoad; |
| callbacks.ClassPrepare = Callback_ClassFilePrepare; |
| |
| err = (*jvmti)->SetEventCallbacks(jvmti, &callbacks, size); |
| if (err != JVMTI_ERROR_NONE) { |
| printf(" Error in SetEventCallbacks: %s (%d)\n", TranslateError(err), err); |
| return JNI_ERR; |
| } |
| |
| err = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, JVMTI_EVENT_CLASS_LOAD, NULL); |
| if (err != JVMTI_ERROR_NONE) { |
| printf(" Error in SetEventNotificationMode: %s (%d)\n", TranslateError(err), err); |
| return JNI_ERR; |
| } |
| |
| err = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, JVMTI_EVENT_CLASS_PREPARE, NULL); |
| |
| if (err != JVMTI_ERROR_NONE) { |
| printf(" Error in SetEventNotificationMode: %s (%d)\n", TranslateError(err), err); |
| return JNI_ERR; |
| } |
| |
| return JNI_OK; |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_MAAClassLoadPrepare_check(JNIEnv *env, jclass cls) { |
| jobject loader = NULL; |
| |
| if (jvmti == NULL) { |
| throw_exc(env, "JVMTI client was not properly loaded!\n"); |
| return FAILED; |
| } |
| |
| if (with_early_vm_start_capability == JNI_TRUE) { |
| /* |
| * Expecting that "java/util/Collections" class from java.base module is present in the |
| * ClassLoad and ClassPrepare events during VM Start phase when can_generate_early_vmstart |
| * capability is enabled. |
| * Expecting that ClassLoad and ClassPrepare events are sent in the VM early start phase |
| * when can_generate_early_vmstart is enabled(JDK-8165681). |
| */ |
| if (class_load_events_vm_start_count == 0) { |
| throw_exc(env, "Didn't get ClassLoad events in start phase!\n"); |
| return FAILED; |
| } |
| |
| printf("Expecting to find '%s' class in ClassLoad events during VM early start phase.\n", EXPECTED_SIGNATURE); |
| if (class_in_class_load_events_vm_start == JNI_FALSE) { |
| throw_exc(env, "Unable to find expected class in ClassLoad events during early start phase!\n"); |
| return FAILED; |
| } |
| |
| if (class_prepare_events_vm_start_count == 0) { |
| throw_exc(env, "Didn't get ClassPrepare events in start phase!\n"); |
| return FAILED; |
| } |
| |
| printf("Expecting to find '%s' class in ClassPrepare events during VM early start phase.\n", EXPECTED_SIGNATURE); |
| if (class_in_class_prepare_events_vm_start == JNI_FALSE) { |
| throw_exc(env, "Unable to find expected class in ClassPrepare events during early start phase!\n"); |
| return FAILED; |
| } |
| } else { |
| /* |
| * Expecting that "java/util/Collections" class from java.base module is not present in the |
| * ClassLoad and ClassPrepare events during VM Start phase when can_generate_early_vmstart |
| * capability is disabled. |
| */ |
| printf("Expecting that '%s' class is absent in ClassLoad events during normal VM start phase.\n", EXPECTED_SIGNATURE); |
| if (class_in_class_prepare_events_vm_start == JNI_TRUE) { |
| throw_exc(env, "Class is found in ClassLoad events during normal VM start phase!\n"); |
| return FAILED; |
| } |
| |
| printf("Expecting that '%s' class is absent in ClassPrepare events during normal VM start phase.\n", EXPECTED_SIGNATURE); |
| if (class_in_class_prepare_events_vm_start == JNI_TRUE) { |
| throw_exc(env, "Class is found in ClassPrepare events during normal VM start phase!\n"); |
| return FAILED; |
| } |
| } |
| |
| /* |
| * In any case, we not expect to see "java/util/Collections" class from java.base module |
| * in the ClassLoad and ClassPrepare events during VM Live phase. |
| */ |
| if (class_in_class_prepare_events_vm_live == JNI_TRUE) { |
| throw_exc(env, "Class is found in ClassLoad events during VM Live phase!\n"); |
| return FAILED; |
| } |
| |
| if (class_in_class_prepare_events_vm_live == JNI_TRUE) { |
| throw_exc(env, "Class is found in ClassPrepare events during VM Live phase!\n"); |
| return FAILED; |
| } |
| |
| return result; |
| } |
| |
| #ifdef __cplusplus |
| } |
| #endif |
