| /* |
| * Copyright (c) 2018, 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" |
| #include "jni.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 |
| |
| |
| static jvmtiEnv *jvmti = NULL; |
| |
| typedef enum { |
| Yes = 1, |
| No = 0, |
| Error = -1 |
| } IsAvail; |
| |
| static IsAvail onLoadIsAvail = Error; |
| |
| void reportError(const char *msg, int err) { |
| printf("%s, error: %d\n", msg, err); |
| } |
| |
| static IsAvail isClassHookAvail() { |
| IsAvail result = Error; |
| do { |
| jvmtiCapabilities caps; |
| jvmtiPhase phase; |
| jvmtiError err; |
| |
| if (jvmti == NULL) { |
| reportError("jvmti is NULL", -1); |
| break; |
| } |
| |
| err = (*jvmti)->GetPhase(jvmti, &phase); |
| if (err != JVMTI_ERROR_NONE) { |
| reportError("GetPhase failed", err); |
| break; |
| } |
| |
| err = (*jvmti)->GetPotentialCapabilities(jvmti, &caps); |
| if (err != JVMTI_ERROR_NONE) { |
| reportError("GetPotentialCapabilities failed", err); |
| break; |
| } |
| |
| result = caps.can_generate_all_class_hook_events ? Yes : No; |
| |
| printf("isClassHookAvail: phase=%d, value=%d\n", phase, result); |
| } while (0); |
| return result; |
| } |
| |
| |
| JNIEXPORT jint JNICALL |
| Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) |
| { |
| jint res = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **) &jvmti), JVMTI_VERSION_9); |
| if (res != JNI_OK || jvmti == NULL) { |
| reportError("GetEnv failed", res); |
| return JNI_ERR; |
| } |
| |
| // check and save can_generate_all_class_hook_events for ONLOAD phase |
| onLoadIsAvail = isClassHookAvail(); |
| |
| return JNI_OK; |
| } |
| |
| JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *jvm, void *reserved) { |
| return JNI_VERSION_9; |
| } |
| |
| |
| JNIEXPORT jint JNICALL |
| Java_CanGenerateAllClassHook_getClassHookAvail(JNIEnv *env, jclass cls) { |
| return isClassHookAvail(); |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_CanGenerateAllClassHook_getOnLoadClassHookAvail(JNIEnv *env, jclass cls) { |
| return onLoadIsAvail; |
| } |
| |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |