/* * Copyright (c) 2003, 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 "agent_common.h" #include "JVMTITools.h" extern "C" { #define STATUS_FAILED 2 #define PASSED 0 static jvmtiEnv *jvmti = NULL; static jvmtiCapabilities caps; static jvmtiEventCallbacks callbacks; static jint result = PASSED; static jboolean printdump = JNI_FALSE; const char* CLASS_NAME = "nsk/jvmti/unit/events/redefineCFLH/JvmtiTestr"; void JNICALL VMInit(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread) { if (printdump == JNI_TRUE) { printf("VMInit event received\n"); } } void JNICALL ClassFileLoadHook(jvmtiEnv *jvmti_env, JNIEnv *env, jclass redefined_class, jobject loader, const char* name, jobject protection_domain, jint class_data_len, const unsigned char* class_data, jint* new_class_data_len, unsigned char** new_class_data) { jvmtiError err; int len = sizeof(jint); char *sig; char *gen; if (name != NULL && (strcmp(name, CLASS_NAME) == 0)) { if (printdump == JNI_TRUE) { printf("Received class file load hook event for class %s\n", name); } if (redefined_class != NULL) { err = jvmti->GetClassSignature(redefined_class, &sig, &gen); if (err != JVMTI_ERROR_NONE) { printf("(GetClassSignature) unexpected error: %s (%d)\n", TranslateError(err), err); result = STATUS_FAILED; } else if (printdump == JNI_TRUE) { printf("redefined class name signature is %s\n", sig); } } err = jvmti->Allocate(class_data_len, new_class_data); if (err != JVMTI_ERROR_NONE) { printf("(Allocate) unexpected error: %s (%d)\n", TranslateError(err), err); result = STATUS_FAILED; } else { *new_class_data_len = class_data_len; memcpy(*new_class_data, class_data, class_data_len); } } } #ifdef STATIC_BUILD JNIEXPORT jint JNICALL Agent_OnLoad_JvmtiTest(JavaVM *jvm, char *options, void *reserved) { return Agent_Initialize(jvm, options, reserved); } JNIEXPORT jint JNICALL Agent_OnAttach_JvmtiTest(JavaVM *jvm, char *options, void *reserved) { return Agent_Initialize(jvm, options, reserved); } JNIEXPORT jint JNI_OnLoad_JvmtiTest(JavaVM *jvm, char *options, void *reserved) { return JNI_VERSION_1_8; } #endif jint Agent_Initialize(JavaVM *vm, char *options, void *reserved) { jint res; jvmtiError err; if (options != NULL && strcmp(options, "printdump") == 0) { printdump = JNI_TRUE; } if ((res = vm->GetEnv((void **) &jvmti, JVMTI_VERSION_1_1)) != JNI_OK) { printf("%s: Failed to call GetEnv: error=%d\n", __FILE__, res); return JNI_ERR; } err = jvmti->GetPotentialCapabilities(&caps); if (err != JVMTI_ERROR_NONE) { printf("(GetPotentialCapabilities) unexpected error: %s (%d)\n", TranslateError(err), err); return JNI_ERR; } err = jvmti->AddCapabilities(&caps); if (err != JVMTI_ERROR_NONE) { printf("(AddCapabilities) unexpected error: %s (%d)\n", TranslateError(err), err); return JNI_ERR; } err = jvmti->GetCapabilities(&caps); if (err != JVMTI_ERROR_NONE) { printf("(GetCapabilities) unexpected error: %s (%d)\n", TranslateError(err), err); return JNI_ERR; } if (!caps.can_redefine_classes) { printf("Warning: RedefineClasses is not implemented\n"); } callbacks.VMInit = &VMInit; callbacks.ClassFileLoadHook = &ClassFileLoadHook; err = jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks)); if (err != JVMTI_ERROR_NONE) { printf("(SetEventCallbacks) unexpected error: %s (%d)\n", TranslateError(err), err); return JNI_ERR; } if ((err = (jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_VM_INIT, NULL))) != JVMTI_ERROR_NONE) { printf("Failed to enable event JVMTI_EVENT_VM_INIT: %s (%d)\n", TranslateError(err), err); return JNI_ERR; } if ((err = (jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_CLASS_FILE_LOAD_HOOK, NULL))) != JVMTI_ERROR_NONE) { printf("Failed to enable event JVMTI_EVENT_CLASS_FILE_LOAD_HOOK: %s (%d)\n", TranslateError(err), err); return JNI_ERR; } return JNI_OK; } JNIEXPORT jint JNICALL Java_nsk_jvmti_unit_events_redefineCFLH_JvmtiTest_makeRedefinition(JNIEnv *env, jclass cls, jint fl, jclass redefCls, jbyteArray classBytes) { jvmtiClassDefinition classDef; jvmtiError err; if (jvmti == NULL) { printf("JVMTI client was not properly loaded!\n"); return STATUS_FAILED; } if (!caps.can_redefine_classes) { return PASSED; } /* filling the structure jvmtiClassDefinition */ classDef.klass = redefCls; classDef.class_byte_count = env->GetArrayLength(classBytes); classDef.class_bytes = (unsigned char *) env->GetByteArrayElements(classBytes, NULL); if (fl == 2) { printf(">>>>>>>> Invoke RedefineClasses():\n"); printf("\tnew class byte count=%d\n", classDef.class_byte_count); } err = jvmti->RedefineClasses(1, &classDef); if (err != JVMTI_ERROR_NONE) { printf("%s: Failed to call RedefineClasses():\n", __FILE__); printf("\tthe function returned error %d: %s\n", err, TranslateError(err)); printf("\tFor more info about this error see the JVMTI spec.\n"); return STATUS_FAILED; } if (fl == 2) printf("<<<<<<<< RedefineClasses() is successfully done\n"); return PASSED; } JNIEXPORT jint JNICALL Java_nsk_jvmti_unit_events_redefineCFLH_JvmtiTest_GetResult(JNIEnv *env, jclass cls) { return result; } }