| /* |
| * 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 ClassPrepare occurrence, enable FieldAccessWatch for a field to be initialized by the initializer. |
| 3. Upon accessing the field by the initializer, redefine the class and pop a currently executed |
| frame of the initializer within incoming FieldAccess callback. |
| */ |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| #define METHOD_NAME "loadClass" |
| #define SIGNATURE "(Ljava/lang/String;)Ljava/lang/Class;" |
| #define FILE_NAME "nsk/jvmti/scenarios/hotswap/HS204/hs204t004/MyClassLoader" |
| #define CLASS_LOADER_CLASS_NAME "Lnsk/jvmti/scenarios/hotswap/HS204/hs204t004/MyClassLoader;" |
| /* for redefine..*/ |
| static jint redefineNumber; |
| static jvmtiEnv * jvmti; |
| static jclass cloader; |
| |
| JNIEXPORT void JNICALL |
| callbackClassLoad(jvmtiEnv *jvmti_env, |
| JNIEnv* jni, |
| jthread thread, |
| jclass klass) { |
| char * className; |
| char * generic; |
| redefineNumber=0; |
| (*jvmti)->GetClassSignature(jvmti, klass, &className, &generic); |
| if (strcmp(className, CLASS_LOADER_CLASS_NAME) == 0) { |
| if (klass != NULL) { |
| jmethodID method; |
| cloader = klass; |
| method = (*jni)->GetMethodID(jni,klass,METHOD_NAME,SIGNATURE); |
| if (method != NULL) { |
| jlocation start; |
| jlocation end; |
| jvmtiError err ; |
| err=(*jvmti)->GetMethodLocation(jvmti, method, &start, &end); |
| if (err == JVMTI_ERROR_NONE) { |
| nsk_printf("Agent:: NO ERRORS FOUND \n"); |
| err= (*jvmti)->SetBreakpoint(jvmti,method, start+1); |
| if ( err == JVMTI_ERROR_NONE) { |
| nsk_printf("Agent:: Breakpoint set \n"); |
| } else { |
| nsk_printf("Agent:: ***ERROR OCCURED ... in SET BREAK POINT ERROR \n"); |
| } |
| } else { |
| nsk_printf("Agent:: ***ERROR OCCURED .. in METHOD LOCATION FINDER \n"); |
| } |
| } else { |
| nsk_printf("Agent:: ***ERROR OCCURED .. COUND NOT FIND THE METHOD AND SIGNATURE SPECIFIED \n"); |
| } |
| } else { |
| nsk_printf("Agent:: ***ERROR OCCURED .. CLASS SPECIFIED WAS NOT FOUND \n"); |
| } |
| } |
| } |
| |
| void JNICALL callbackBreakpoint(jvmtiEnv *jvmti_env, |
| JNIEnv* jni, |
| jthread thread, |
| jmethodID method, |
| jlocation loc) { |
| jvmtiError err ; |
| jclass clas; |
| char fileName[512]; |
| clas = (*jni)->FindClass(jni,CLASS_LOADER_CLASS_NAME); |
| nsk_printf("Agent:: Break Pont Reached..\n"); |
| /* Redefine the class loader and then pop the |
| frame and resume the thread..*/ |
| nsk_jvmti_getFileName(redefineNumber, FILE_NAME, fileName, sizeof(fileName)/sizeof(char)); |
| if ( nsk_jvmti_redefineClass( jvmti_env, clas, fileName) == NSK_TRUE) { |
| nsk_printf("\nMyClass :: Successfully redefined..\n"); |
| } else { |
| nsk_printf("\nMyClass :: Failed to redefine ..\n"); |
| } |
| nsk_printf(" End of REDEFINE CLASS LOADER \n"); |
| err=(*jvmti)->SuspendThread(jvmti,thread); |
| if (err == JVMTI_ERROR_NONE) { |
| nsk_printf("Agent:: Succeded in suspending..\n"); |
| } else if (err == JVMTI_ERROR_THREAD_SUSPENDED) { |
| nsk_printf("Agent:: JVMTI_ERROR_THREAD_SUSPENDED \n"); |
| } else if ( err == JVMTI_ERROR_INVALID_THREAD) { |
| nsk_printf("Agent:: JVMTI_ERROR_INVALID_THREAD \n"); |
| } else if ( err == JVMTI_ERROR_THREAD_NOT_ALIVE) { |
| nsk_printf("Agent:: JVMTI_ERROR_THREAD_NOT_ALIVE \n"); |
| } else { |
| nsk_printf(" Else error "); |
| } |
| } |
| |
| |
| #ifdef STATIC_BUILD |
| JNIEXPORT jint JNICALL Agent_OnLoad_hs204t004(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNICALL Agent_OnAttach_hs204t004(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNI_OnLoad_hs204t004(JavaVM *jvm, char *options, void *reserved) { |
| return JNI_VERSION_1_8; |
| } |
| #endif |
| jint Agent_Initialize(JavaVM *vm, char *options, void *reserved) { |
| jint rc ; |
| nsk_printf("Agent:: VM.. Started..\n"); |
| rc=(*vm)->GetEnv(vm, (void **)&jvmti, JVMTI_VERSION_1_1); |
| if ( rc!= JNI_OK ) { |
| nsk_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; |
| } |
| caps.can_redefine_classes = 1; |
| caps.can_suspend=1; |
| caps.can_pop_frame=1; |
| caps.can_generate_breakpoint_events=1; |
| caps.can_generate_all_class_hook_events=1; |
| (*jvmti)->AddCapabilities(jvmti, &caps); |
| memset(&eventCallbacks, 0, sizeof(eventCallbacks)); |
| eventCallbacks.ClassLoad =callbackClassLoad; |
| eventCallbacks.Breakpoint = callbackBreakpoint; |
| rc=(*jvmti)->SetEventCallbacks(jvmti,&eventCallbacks, sizeof(eventCallbacks)); |
| if (rc != JVMTI_ERROR_NONE) { |
| nsk_printf(" Agent:: Error occured while setting event call back \n"); |
| return JNI_ERR; |
| } |
| nsk_jvmti_enableNotification(jvmti,JVMTI_EVENT_CLASS_LOAD, NULL); |
| nsk_jvmti_enableNotification(jvmti,JVMTI_EVENT_BREAKPOINT, NULL); |
| } |
| return JNI_OK; |
| } |
| |
| JNIEXPORT jboolean JNICALL |
| Java_nsk_jvmti_scenarios_hotswap_HS204_hs204t004_hs204t004_popFrame(JNIEnv * jni, |
| jclass clas, |
| jthread thread) { |
| jvmtiError err ; |
| jboolean retvalue; |
| jint state; |
| nsk_printf("Agent:: POPING THE FRAME....\n"); |
| retvalue = JNI_FALSE; |
| (*jvmti)->GetThreadState(jvmti, thread, &state); |
| if ( state & JVMTI_THREAD_STATE_IN_NATIVE) nsk_printf("JVMTI_THREAD_STATE_IN_NATIVE"); |
| if ( state & JVMTI_THREAD_STATE_INTERRUPTED) nsk_printf( "JVMTI_THREAD_STATE_INTERRUPTED"); |
| if ( state & JVMTI_THREAD_STATE_WAITING) nsk_printf(" JVMTI_THREAD_STATE_WAITING"); |
| if ( state & JVMTI_THREAD_STATE_SUSPENDED) { |
| nsk_printf("Agent:: Thread state .. JVMTI_THREAD_STATE_SUSPENDED \n"); |
| err = (*jvmti)->PopFrame(jvmti,thread); |
| if (err == JVMTI_ERROR_NONE) { |
| nsk_printf("Agent:: NO Errors poped very well ..\n"); |
| err = (*jvmti)->ResumeThread(jvmti,thread); |
| if (err == JVMTI_ERROR_NONE) { |
| retvalue = JNI_TRUE; |
| } else { |
| nsk_printf("Agent:: Error occured in resuming a thread..\n"); |
| } |
| } else { |
| nsk_printf("Agent:: some other error ..%s \n",TranslateError(err)); |
| } |
| } else { |
| nsk_printf("Agent:: Thread is not suspended ..\n"); |
| } |
| return retvalue; |
| } |
| |
| |
| #ifdef __cplusplus |
| } |
| #endif |
