| /* |
| * 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 <stdlib.h> |
| #include <jvmti.h> |
| #include "agent_common.h" |
| #include <jni.h> |
| #include <string.h> |
| #include "jvmti_tools.h" |
| #include "jni_tools.h" |
| #include "JVMTITools.h" |
| /* |
| hs203T003: |
| 1. Set FieldAccessWatch, FieldModificatoinWatch for a field. |
| 2. Upon access/modification of the field within a method, redefine |
| a class with the changed field version, and pop a currently executed |
| frame within FieldAccess/FieldModification callback. |
| |
| */ |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| #define DIR_NAME "newclass" |
| #define PATH_FORMAT "%s%02d/%s" |
| |
| #define FILE_NAME "nsk/jvmti/scenarios/hotswap/HS203/hs203t003/MyThread" |
| #define CLASS_NAME "Lnsk/jvmti/scenarios/hotswap/HS203/hs203t003/MyThread;" |
| #define SEARCH_NAME "nsk/jvmti/scenarios/hotswap/HS203/hs203t003/MyThread" |
| #define FIELDNAME "threadState" |
| #define TYPE "I" |
| |
| static jint redefineNumber; |
| static jvmtiEnv * jvmti; |
| static int redefineCnt=0; |
| |
| JNIEXPORT void JNICALL callbackClassPrepare(jvmtiEnv *jvmti_env, |
| JNIEnv* jni, |
| jthread thread, |
| jclass klass) { |
| char * className; |
| char * generic; |
| redefineNumber=0; |
| className=NULL; |
| generic=NULL; |
| if ( ! NSK_JVMTI_VERIFY ( NSK_CPP_STUB4(GetClassSignature, |
| jvmti_env, klass, &className, &generic) ) ) { |
| nsk_printf("#error Agent :: while getting classname Signature.\n"); |
| nsk_jvmti_agentFailed(); |
| } else { |
| if (strcmp(className,CLASS_NAME) == 0) { |
| jfieldID field; |
| /* get the field id and set watch on that .*/ |
| if (! NSK_JNI_VERIFY(jni, (field = NSK_CPP_STUB4(GetFieldID, |
| jni, klass, FIELDNAME, TYPE)) != NULL) ) { |
| nsk_printf(" Agent :: (*JNI)->GetFieldID(jni, ... ) returns `null`.\n"); |
| nsk_jvmti_agentFailed(); |
| } else if ( ! NSK_JVMTI_VERIFY(NSK_CPP_STUB3(SetFieldAccessWatch, |
| jvmti_env, klass, field) ) ) { |
| nsk_printf("#error Agent :: occured while jvmti->SetFieldAccessWatch(... ) .\n"); |
| nsk_jvmti_agentFailed(); |
| } |
| } |
| } |
| } |
| |
| JNIEXPORT void JNICALL callbackFieldAccess(jvmtiEnv *jvmti_env, |
| JNIEnv* jni, |
| jthread thread, |
| jmethodID method, |
| jlocation location, |
| jclass field_klass, |
| jobject object, |
| jfieldID field) { |
| jclass clas; |
| char fileName[512]; |
| if (redefineCnt < 10) { |
| redefineCnt++; |
| return; |
| } |
| redefineNumber=0; |
| if (! NSK_JNI_VERIFY(jni, (clas = NSK_CPP_STUB2(FindClass, jni, SEARCH_NAME)) != NULL) ) { |
| nsk_printf(" Agent :: (*JNI)->FindClass(jni, %s) returns `null`.\n",SEARCH_NAME); |
| nsk_jvmti_agentFailed(); |
| } else { |
| nsk_jvmti_getFileName(redefineNumber, FILE_NAME, fileName, |
| sizeof(fileName)/sizeof(char)); |
| if ( nsk_jvmti_redefineClass(jvmti_env, clas, fileName ) != NSK_TRUE) { |
| nsk_printf(" Agent :: Failed to redefine.\n"); |
| nsk_jvmti_agentFailed(); |
| } else { |
| nsk_printf(" Agent :: Redefined.\n"); |
| nsk_printf(" Agent :: Suspendeding thread.\n"); |
| /* pop the current working frame. */ |
| if ( ! NSK_JVMTI_VERIFY( NSK_CPP_STUB2(SuspendThread, jvmti_env, thread) ) ) { |
| nsk_printf("#error Agent :: occured suspending Thread.\n"); |
| nsk_jvmti_agentFailed(); |
| } else { |
| nsk_printf(" Agent :: Succeded in suspending.\n"); |
| } |
| } |
| } |
| } |
| |
| #ifdef STATIC_BUILD |
| JNIEXPORT jint JNICALL Agent_OnLoad_hs203t003(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNICALL Agent_OnAttach_hs203t003(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNI_OnLoad_hs203t003(JavaVM *jvm, char *options, void *reserved) { |
| return JNI_VERSION_1_8; |
| } |
| #endif |
| jint Agent_Initialize(JavaVM *vm, char *options, void *reserved) { |
| if ( ! NSK_JVMTI_VERIFY ( NSK_CPP_STUB3(GetEnv, vm, |
| (void **)&jvmti, JVMTI_VERSION_1_1) ) ) { |
| nsk_printf(" Agent :: Could not load JVMTI interface.\n"); |
| return JNI_ERR; |
| } else { |
| jvmtiCapabilities caps; |
| jvmtiEventCallbacks eventCallbacks; |
| if (nsk_jvmti_parseOptions(options) == NSK_FALSE ) { |
| nsk_printf("#error Agent :: Failed to parse options.\n"); |
| return JNI_ERR; |
| } |
| memset(&caps, 0, sizeof(caps)); |
| caps.can_redefine_classes = 1; |
| caps.can_suspend=1; |
| caps.can_pop_frame=1; |
| caps.can_generate_all_class_hook_events=1; |
| caps.can_generate_field_access_events=1; |
| if (! NSK_JVMTI_VERIFY ( NSK_CPP_STUB2(AddCapabilities, jvmti, &caps) )) { |
| nsk_printf("#error Agent :: while adding capabilities.\n"); |
| return JNI_ERR; |
| } |
| memset(&eventCallbacks, 0, sizeof(eventCallbacks)); |
| eventCallbacks.ClassPrepare =callbackClassPrepare; |
| eventCallbacks.FieldAccess= callbackFieldAccess; |
| if (!NSK_JVMTI_VERIFY( |
| NSK_CPP_STUB3(SetEventCallbacks, jvmti, |
| &eventCallbacks, sizeof(eventCallbacks)))) { |
| nsk_printf("#error Agent :: while setting event callbacks.\n"); |
| return JNI_ERR; |
| } |
| if ( ( nsk_jvmti_enableNotification(jvmti,JVMTI_EVENT_CLASS_PREPARE, NULL) |
| == NSK_TRUE ) && |
| ( nsk_jvmti_enableNotification(jvmti,JVMTI_EVENT_FIELD_ACCESS, NULL) |
| == NSK_TRUE ) ) { |
| nsk_printf(" Agent :: Notifications are enabled.\n"); |
| } else { |
| nsk_printf("#error Agent :: Eanableing Notifications.\n"); |
| return JNI_ERR; |
| } |
| } |
| return JNI_OK; |
| } |
| |
| |
| JNIEXPORT jboolean JNICALL |
| Java_nsk_jvmti_scenarios_hotswap_HS203_hs203t003_hs203t003_popThreadFrame(JNIEnv * jni, |
| jclass clas, |
| jthread thread) { |
| jboolean retvalue; |
| jint state; |
| retvalue = JNI_FALSE; |
| if ( ! NSK_JVMTI_VERIFY( NSK_CPP_STUB3(GetThreadState, jvmti, thread, &state) ) ) { |
| nsk_printf(" Agent :: Error while getting thread state.\n"); |
| nsk_jvmti_agentFailed(); |
| } else { |
| if ( state & JVMTI_THREAD_STATE_SUSPENDED) { |
| if ( ! NSK_JVMTI_VERIFY ( NSK_CPP_STUB2( PopFrame, jvmti, thread) ) ) { |
| nsk_printf("#error Agent :: while poping thread's frame.\n"); |
| nsk_jvmti_agentFailed(); |
| } else { |
| nsk_printf(" Agent :: poped thread frame.\n"); |
| if ( ! NSK_JVMTI_VERIFY ( NSK_CPP_STUB4 (SetEventNotificationMode, jvmti, |
| JVMTI_DISABLE, JVMTI_EVENT_FIELD_ACCESS, NULL) ) ) { |
| nsk_printf("#error Agent :: failed to disable notification JVMTI_EVENT_FIELD ACCESS.\n"); |
| nsk_jvmti_agentFailed(); |
| } else { |
| nsk_printf(" Agent :: Disabled notification JVMTI_EVENT_FIELD ACCESS. \n"); |
| retvalue = JNI_TRUE; |
| } |
| } |
| } else { |
| nsk_printf("#error Agent :: Thread was not suspened."); |
| nsk_jvmti_agentFailed(); |
| } |
| } |
| return retvalue; |
| } |
| |
| JNIEXPORT jboolean JNICALL |
| Java_nsk_jvmti_scenarios_hotswap_HS203_hs203t003_hs203t003_resumeThread(JNIEnv * jni, |
| jclass clas, |
| jthread thread) { |
| jboolean retvalue; |
| retvalue = JNI_FALSE; |
| if ( !NSK_JVMTI_VERIFY( NSK_CPP_STUB2 ( ResumeThread, jvmti, thread)) ) { |
| nsk_printf("#error Agent :: while resuming thread.\n"); |
| nsk_jvmti_agentFailed(); |
| } else { |
| nsk_printf(" Agent :: Thread resumed.\n"); |
| retvalue= JNI_TRUE; |
| } |
| return retvalue; |
| } |
| |
| #ifdef __cplusplus |
| } |
| #endif |
