| /* |
| * Copyright (c) 2007, 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 <jvmti.h> |
| #include "agent_common.h" |
| #include <jni.h> |
| #include <string.h> |
| #include "jvmti_tools.h" |
| #include "JVMTITools.h" |
| /* |
| *1. Enable event ClassPrepare. |
| *2. Upon occurrence of ClassPrepare, set a breakpoint in class static |
| * initializer. |
| *3. Upon reaching the breakpoint, redefine the class and pop |
| *a currently executed frame of the static initializer. |
| */ |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| #define FILE_NAME "nsk/jvmti/scenarios/hotswap/HS204/hs204t002/MyThread" |
| |
| #define SEARCH_NAME "nsk/jvmti/scenarios/hotswap/HS204/hs204t002/MyThread" |
| #define CLASS_NAME "Lnsk/jvmti/scenarios/hotswap/HS204/hs204t002/MyThread;" |
| #define METHOD_NAME "<init>" |
| #define METHOD_SIGNATURE "()V" |
| static jint redefineNumber; |
| static jvmtiEnv * jvmti; |
| |
| JNIEXPORT void JNICALL |
| callbackClassPrepare(jvmtiEnv *jvmti, |
| JNIEnv* jni, |
| jthread thread, |
| jclass klass) { |
| char * className; |
| char * generic; |
| redefineNumber=0; |
| (*jvmti)->GetClassSignature(jvmti, klass, &className, &generic); |
| /* printf("Agent::Class Name %s \n",className); */ |
| if( (strcmp(className, CLASS_NAME) == 0 ) ) { |
| jclass cls; |
| cls = (*jni)->FindClass(jni,SEARCH_NAME); |
| if (cls == NULL) { |
| printf("Agent::CLS is null"); |
| } else { |
| jmethodID method; |
| method = (*jni)->GetMethodID(jni,cls, METHOD_NAME,METHOD_SIGNATURE); |
| if (method == NULL) { |
| printf("Agent::Method is null "); |
| } else { |
| jlocation start; |
| jlocation end; |
| jvmtiError err ; |
| err=(*jvmti)->GetMethodLocation(jvmti, method, &start, &end); |
| if ( err != JVMTI_ERROR_NONE) { |
| printf("Agent::Errors in finding start and end for the method \n"); |
| } else { |
| printf("Agent Start = %"LL"d and end = %"LL"d \n", start , end); |
| printf("Agent::setting break points.."); |
| err= (*jvmti)->SetBreakpoint(jvmti,method, start+1); |
| if (err == JVMTI_ERROR_DUPLICATE) { |
| printf("Agent::JVMTI_ERROR_DUPLICATE"); |
| } else if (err ==JVMTI_ERROR_INVALID_METHODID ) { |
| printf("Agent::JVMTI_ERROR_INVALID_METHODID "); |
| } else if ( err == JVMTI_ERROR_INVALID_LOCATION) { |
| printf("Agent::JVMTI_ERROR_INVALID_LOCATION "); |
| } else if ( err == JVMTI_ERROR_NONE) { |
| printf("Agent::NO ERRORS "); |
| } else { |
| printf("Agent::VERY VERY INVALID STATE "); |
| } |
| } |
| } |
| } |
| } |
| return; |
| } |
| void JNICALL callbackBreakpoint(jvmtiEnv *jvmti_env, |
| JNIEnv* jni, |
| jthread thread, |
| jmethodID method, |
| jlocation loc) { |
| jclass cls; |
| char fileName[512]; |
| |
| nsk_jvmti_getFileName(redefineNumber, FILE_NAME, fileName, |
| sizeof(fileName)/sizeof(char)); |
| cls = (*jni)->FindClass(jni,SEARCH_NAME); |
| printf("Agent:: Break Pont Reached.."); |
| if ( nsk_jvmti_redefineClass(jvmti, cls, fileName ) == NSK_TRUE) { |
| nsk_printf("\nMyClass :: Successfully redefined..\n"); |
| } else { |
| nsk_printf("\nMyClass :: Failed to redefine ..\n"); |
| } |
| } |
| |
| |
| #ifdef STATIC_BUILD |
| JNIEXPORT jint JNICALL Agent_OnLoad_hs204t002(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNICALL Agent_OnAttach_hs204t002(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNI_OnLoad_hs204t002(JavaVM *jvm, char *options, void *reserved) { |
| return JNI_VERSION_1_8; |
| } |
| #endif |
| jint Agent_Initialize(JavaVM *vm, char *options, void *reserved) { |
| |
| jint rc ; |
| printf("Agent:: VM.. Started..\n"); |
| rc=(*vm)->GetEnv(vm, (void **)&jvmti, JVMTI_VERSION_1_1); |
| if ( rc!= JNI_OK ) { |
| printf("Agent:: Could not load JVMTI interface \n"); |
| return JNI_ERR; |
| } else { |
| jvmtiCapabilities caps; |
| jvmtiEventCallbacks eventCallbacks; |
| memset(&caps, 0, sizeof(caps)); |
| if (!nsk_jvmti_parseOptions(options)) { |
| nsk_printf(" NSK Failed to parse.."); |
| return JNI_ERR; |
| } |
| /* |
| required to set a prepareClassLoad not required call |
| and setBreakPoint is required. |
| and redefine is required.. |
| */ |
| caps.can_redefine_classes = 1; |
| caps.can_generate_breakpoint_events=1; |
| caps.can_redefine_classes = 1; |
| (*jvmti)->AddCapabilities(jvmti, &caps); |
| memset(&eventCallbacks, 0, sizeof(eventCallbacks)); |
| eventCallbacks.ClassPrepare = callbackClassPrepare; |
| eventCallbacks.Breakpoint = callbackBreakpoint; |
| rc=(*jvmti)->SetEventCallbacks(jvmti,&eventCallbacks, sizeof(eventCallbacks)); |
| |
| if (rc != JVMTI_ERROR_NONE) { |
| printf("Agent:: Error occured while setting event call back \n"); |
| return JNI_ERR; |
| } |
| |
| nsk_jvmti_enableNotification(jvmti, JVMTI_EVENT_CLASS_PREPARE , NULL); |
| nsk_jvmti_enableNotification(jvmti, JVMTI_EVENT_BREAKPOINT, NULL); |
| } |
| return JNI_OK; |
| } |
| |
| #ifdef __cplusplus |
| } |
| #endif |