| /* |
| * Copyright (c) 2017, Red Hat, Inc. All rights reserved. |
| * |
| * 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 *EXC_CNAME = "java/lang/Exception"; |
| |
| static jvmtiEnv *jvmti = NULL; |
| static jint result = PASSED; |
| |
| 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_1_8; |
| } |
| |
| static |
| jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) { |
| jvmtiCapabilities capabilities; |
| jint 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; |
| } |
| |
| (void)memset(&capabilities, 0, sizeof(capabilities)); |
| capabilities.can_tag_objects = 1; |
| capabilities.can_generate_garbage_collection_events = 1; |
| (*jvmti)->AddCapabilities(jvmti, &capabilities); |
| |
| return JNI_OK; |
| } |
| |
| static |
| void throw_exc(JNIEnv *env, char *msg) { |
| jclass exc_class = JNI_ENV_PTR(env)->FindClass(JNI_ENV_ARG(env, EXC_CNAME)); |
| jint rt = JNI_OK; |
| |
| if (exc_class == NULL) { |
| printf("throw_exc: Error in FindClass(env, %s)\n", EXC_CNAME); |
| return; |
| } |
| rt = JNI_ENV_PTR(env)->ThrowNew(JNI_ENV_ARG(env, exc_class), msg); |
| if (rt == JNI_ERR) { |
| printf("throw_exc: Error in JNI ThrowNew(env, %s)\n", msg); |
| } |
| } |
| |
| static jint JNICALL heap_iter_callback(jlong class_tag, |
| jlong size, |
| jlong* tag_ptr, |
| jint length, |
| void* user_data) { |
| (*((jint*)(user_data)))++; |
| return JVMTI_VISIT_OBJECTS; |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_TestHeapDump_heapdump(JNIEnv *env, jclass cls, jclass filter_cls) { |
| jvmtiHeapCallbacks callbacks; |
| jint totalCount = 0; |
| if (jvmti == NULL) { |
| throw_exc(env, "JVMTI client was not properly loaded!\n"); |
| return 0; |
| } |
| |
| (void)memset(&callbacks, 0, sizeof(callbacks)); |
| callbacks.heap_iteration_callback = &heap_iter_callback; |
| (*jvmti)->IterateThroughHeap(jvmti, 0, filter_cls, &callbacks, (const void *)&totalCount); |
| return totalCount; |
| } |
| |
| #ifdef __cplusplus |
| } |
| #endif |