/* * 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 #include #include #include #include "agent_common.h" #include #include "jvmti_tools.h" #include "jni_tools.h" #include "JVMTITools.h" extern "C" { #define FILE_NAME "nsk/jvmti/scenarios/hotswap/HS204/hs204t003/MyThread" #define CLASS_NAME "Lnsk/jvmti/scenarios/hotswap/HS204/hs204t003/MyThread;" #define FIELDNAME "intState" #define TYPE "I" static jint redefineNumber; static jvmtiEnv * jvmti; static jclass watchFieldClass; JNIEXPORT void JNICALL callbackClassPrepare(jvmtiEnv *jvmti_env, JNIEnv* jni, jthread thread, jclass klass) { char * className; char * generic; className = NULL; generic = NULL; redefineNumber=0; if ( !NSK_JVMTI_VERIFY(jvmti_env->GetClassSignature(klass, &className, &generic)) ) { NSK_DISPLAY0(" Agent :: Failed get class signature.\n"); nsk_jvmti_agentFailed(); } else { if( (strcmp(className, CLASS_NAME) == 0 ) ) { jfieldID fieldId; if ( ! NSK_JNI_VERIFY(jni, (fieldId = jni->GetStaticFieldID(klass, FIELDNAME, TYPE) ) != NULL ) ) { NSK_DISPLAY0(" Agent :: Failed to get FieldId.\n"); nsk_jvmti_agentFailed(); } else { if ( ! NSK_JVMTI_VERIFY(jvmti_env->SetFieldAccessWatch(klass, fieldId) ) ) { NSK_DISPLAY0(" Agent :: Failed to set watch point on a field.\n"); nsk_jvmti_agentFailed(); } else { nsk_jvmti_enableNotification(jvmti_env, JVMTI_EVENT_FIELD_ACCESS, NULL); if (! NSK_JNI_VERIFY(jni, ( watchFieldClass = (jclass) jni->NewGlobalRef(klass) ) != NULL ) ) { NSK_DISPLAY0(" Agent :: Failed to get global reference for class.\n"); nsk_jvmti_agentFailed(); } NSK_DISPLAY0(" Agent :: SetFieldAccessWatch.\n"); } } NSK_DISPLAY1(" Agent :: Leaving callbackClassPrepare for class = %s .\n", className); } } if ( className != NULL ) { if (!NSK_JVMTI_VERIFY(jvmti_env->Deallocate((unsigned char *)className))) { NSK_DISPLAY1(" Agent :: #error failed to Deallocate className = %s.", className); nsk_jvmti_agentFailed(); } } if ( generic != NULL ) { if (!NSK_JVMTI_VERIFY(jvmti_env->Deallocate((unsigned char *)generic))) { NSK_DISPLAY1(" Agent :: #error failed to Deallocate class signature = %s.", generic); nsk_jvmti_agentFailed(); } } return; } JNIEXPORT void JNICALL callbackFieldAccess(jvmtiEnv *jvmti_env, JNIEnv* jni, jthread thread, jmethodID method, jlocation location, jclass field_klass, jobject object, jfieldID field) { char fileName[512]; char * className; char * generic; className = NULL; generic = NULL; if (redefineNumber != 0 ) { return; } if ( ! NSK_JVMTI_VERIFY(jvmti_env->GetClassSignature(field_klass, &className, &generic)) ) { NSK_DISPLAY0(" Agent :: Failed get class signature.\n"); nsk_jvmti_agentFailed(); } else { if( (strcmp(className, CLASS_NAME) == 0 ) ) { jvmtiThreadInfo info; nsk_jvmti_getFileName(redefineNumber, FILE_NAME, fileName, sizeof(fileName)/sizeof(char)); if ( nsk_jvmti_redefineClass(jvmti_env, field_klass, fileName) == NSK_TRUE ) { NSK_DISPLAY0(" Agent :: Successfully redefined.\n"); redefineNumber++; } else { NSK_DISPLAY0(" Agent :: Failed to redefine.\n"); nsk_jvmti_agentFailed(); } NSK_DISPLAY0(" Agent :: Before attempting thread suspend.\n"); if ( ! NSK_JVMTI_VERIFY(jvmti_env->GetThreadInfo(thread , &info)) ) { NSK_DISPLAY0(" Agent :: error getting thread info "); nsk_jvmti_agentFailed(); } else { NSK_DISPLAY1(" Agent :: Thread Name = %s .\n", info.name); } if ( ! NSK_JVMTI_VERIFY(jvmti_env->SuspendThread(thread)) ) { NSK_DISPLAY0(" Agent :: Failed to suspend thread.\n"); nsk_jvmti_agentFailed(); } } } if ( className != NULL ) { if (!NSK_JVMTI_VERIFY(jvmti_env->Deallocate((unsigned char *)className))) { NSK_DISPLAY1(" Agent :: #error failed to Deallocate className = %s.", className); nsk_jvmti_agentFailed(); } } if ( generic != NULL ) { if (!NSK_JVMTI_VERIFY(jvmti_env->Deallocate((unsigned char *)generic))) { NSK_DISPLAY1(" Agent :: #error failed to Deallocate class signature = %s.", generic); nsk_jvmti_agentFailed(); } } } #ifdef STATIC_BUILD JNIEXPORT jint JNICALL Agent_OnLoad_hs204t003(JavaVM *jvm, char *options, void *reserved) { return Agent_Initialize(jvm, options, reserved); } JNIEXPORT jint JNICALL Agent_OnAttach_hs204t003(JavaVM *jvm, char *options, void *reserved) { return Agent_Initialize(jvm, options, reserved); } JNIEXPORT jint JNI_OnLoad_hs204t003(JavaVM *jvm, char *options, void *reserved) { return JNI_VERSION_1_8; } #endif jint Agent_Initialize(JavaVM *vm, char *options, void *reserved) { if ( ! NSK_VERIFY ( JNI_OK == vm->GetEnv((void **)&jvmti, JVMTI_VERSION_1_1) ) ) { NSK_DISPLAY0("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_DISPLAY0(" NSK Failed to parse.."); return JNI_ERR; } caps.can_redefine_classes = 1; caps.can_generate_field_access_events = 1; caps.can_pop_frame = 1; caps.can_suspend = 1; if ( ! NSK_JVMTI_VERIFY(jvmti->AddCapabilities(&caps)) ) { NSK_DISPLAY0(" Agent :: Failed add required capabilities\n."); return JNI_ERR; } memset(&eventCallbacks, 0, sizeof(eventCallbacks)); eventCallbacks.ClassPrepare = callbackClassPrepare; eventCallbacks.FieldAccess = callbackFieldAccess; if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&eventCallbacks, sizeof(eventCallbacks) ) ) ) { NSK_DISPLAY0(" Agent :: Error occured while setting event call back \n"); return JNI_ERR; } nsk_jvmti_enableNotification(jvmti, JVMTI_EVENT_CLASS_PREPARE, NULL); } return JNI_OK; } JNIEXPORT jboolean JNICALL Java_nsk_jvmti_scenarios_hotswap_HS204_hs204t003_hs204t003_popFrame(JNIEnv * jni, jobject object, jthread thread) { jboolean retvalue; jint state; retvalue = JNI_FALSE; if (! NSK_JVMTI_VERIFY(jvmti->GetThreadState(thread, &state)) ){ NSK_DISPLAY0(" Agent :: Error getting thread state.\n"); nsk_jvmti_agentFailed(); } else { if ( state & JVMTI_THREAD_STATE_SUSPENDED) { NSK_DISPLAY0(" Agent :: Thread state = JVMTI_THREAD_STATE_SUSPENDED.\n"); if ( ! NSK_JVMTI_VERIFY (jvmti->PopFrame(thread) ) ) { NSK_DISPLAY0("#error Agent :: Jvmti failed to do popFrame.\n"); nsk_jvmti_agentFailed(); } else { if ( ! NSK_JVMTI_VERIFY (jvmti->ResumeThread(thread)) ) { NSK_DISPLAY0(" Agent :: Error occured in resuming a thread.\n"); nsk_jvmti_agentFailed(); } else { jfieldID fieldId = jni->GetStaticFieldID(watchFieldClass, FIELDNAME, TYPE); if ( ! NSK_JNI_VERIFY(jni, fieldId != NULL ) ) { NSK_DISPLAY0(" Agent :: Failed to get FieldId before droping watchers.\n"); nsk_jvmti_agentFailed(); } else { if ( ! NSK_JVMTI_VERIFY (jvmti->ClearFieldAccessWatch(watchFieldClass, fieldId)) ) { NSK_DISPLAY0(" Agent :: failed to drop field watces.\n"); nsk_jvmti_agentFailed(); } else { NSK_DISPLAY0(" Agent :: Sucessfully droped watches.\n"); retvalue = JNI_TRUE; } } } } } else { NSK_DISPLAY0(" Agent :: Thread should be suspended to its pop frame.\n"); } } return retvalue; } }