| /* |
| * Copyright (c) 2004, 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 <stdlib.h> |
| #include <string.h> |
| #include "jni_tools.h" |
| #include "agent_common.h" |
| #include "jvmti_tools.h" |
| |
| #define PASSED 0 |
| #define STATUS_FAILED 2 |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /* ========================================================================== */ |
| |
| /* scaffold objects */ |
| static jlong timeout = 0; |
| |
| /* test objects */ |
| static jclass testedClass = NULL; |
| static jint klass_byte_count = 0; |
| static unsigned char *klass_bytes = NULL; |
| static int magicIndex = 0; |
| static int ClassFileLoadHookEventFlag = NSK_FALSE; |
| |
| const char* CLASS_NAME = "nsk/jvmti/scenarios/multienv/MA06/ma06t001a"; |
| static const jint magicNumber = 0x12345678; |
| |
| /* ========================================================================== */ |
| |
| /** callback functions **/ |
| |
| static void JNICALL |
| ClassFileLoadHook(jvmtiEnv *jvmti_env, JNIEnv *jni_env, |
| jclass class_being_redefined, 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) { |
| jint i; |
| |
| if (name != NULL && (strcmp(name, CLASS_NAME) == 0)) { |
| ClassFileLoadHookEventFlag = NSK_TRUE; |
| NSK_DISPLAY0("ClassFileLoadHook event\n"); |
| |
| if (class_being_redefined == NULL) { |
| /* sent by class load */ |
| if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB3(Allocate, |
| jvmti_env, class_data_len, &klass_bytes))) |
| nsk_jvmti_setFailStatus(); |
| else { |
| memcpy(klass_bytes, class_data, class_data_len); |
| klass_byte_count = class_data_len; |
| for (i = 0; i < klass_byte_count - 3; i++) { |
| if (((jint)klass_bytes[i+3] | |
| ((jint)klass_bytes[i+2] << 8) | |
| ((jint)klass_bytes[i+1] << 16) | |
| ((jint)klass_bytes[i] << 24)) == magicNumber) { |
| magicIndex = i; |
| break; |
| } |
| } |
| if (klass_byte_count == 0) { |
| NSK_COMPLAIN0("Cannot find magic number\n"); |
| nsk_jvmti_setFailStatus(); |
| } |
| } |
| } |
| } |
| } |
| |
| /* ========================================================================== */ |
| |
| static int prepare(jvmtiEnv* jvmti, JNIEnv* jni) { |
| |
| NSK_DISPLAY1("Find class: %s\n", CLASS_NAME); |
| if (!NSK_JNI_VERIFY(jni, (testedClass = |
| NSK_CPP_STUB2(FindClass, jni, CLASS_NAME)) != NULL)) |
| return NSK_FALSE; |
| |
| if (!NSK_JNI_VERIFY(jni, (testedClass = |
| NSK_CPP_STUB2(NewGlobalRef, jni, testedClass)) != NULL)) |
| return NSK_FALSE; |
| |
| return NSK_TRUE; |
| } |
| |
| /* ========================================================================== */ |
| |
| static int redefine(jvmtiEnv* jvmti, jint value) { |
| jvmtiClassDefinition class_def; |
| |
| if (!NSK_VERIFY(klass_byte_count != 0 && klass_bytes != NULL)) |
| return NSK_FALSE; |
| |
| if (!NSK_VERIFY(magicIndex != 0)) |
| return NSK_FALSE; |
| |
| NSK_DISPLAY1("Redefining with %d\n", value); |
| |
| klass_bytes[magicIndex] = 0; |
| klass_bytes[magicIndex+1] = 0; |
| klass_bytes[magicIndex+2] = 0; |
| klass_bytes[magicIndex+3] = (jbyte)value; |
| |
| class_def.klass = testedClass; |
| class_def.class_byte_count = klass_byte_count; |
| class_def.class_bytes = klass_bytes; |
| if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB3(RedefineClasses, jvmti, 1, &class_def))) |
| return NSK_FALSE; |
| |
| return NSK_TRUE; |
| } |
| |
| /* ========================================================================== */ |
| |
| /** Agent algorithm. */ |
| static void JNICALL |
| agentProc(jvmtiEnv* jvmti, JNIEnv* jni, void* arg) { |
| |
| if (!nsk_jvmti_waitForSync(timeout)) |
| return; |
| |
| if (!NSK_VERIFY(ClassFileLoadHookEventFlag)) { |
| NSK_COMPLAIN0("Missing initial ClassFileLoadHook event\n"); |
| nsk_jvmti_setFailStatus(); |
| return; |
| } |
| |
| ClassFileLoadHookEventFlag = NSK_FALSE; |
| |
| if (!prepare(jvmti, jni)) { |
| nsk_jvmti_setFailStatus(); |
| return; |
| } |
| |
| /* resume debugee and wait for sync */ |
| if (!nsk_jvmti_resumeSync()) |
| return; |
| if (!nsk_jvmti_waitForSync(timeout)) |
| return; |
| |
| if (!NSK_VERIFY(ClassFileLoadHookEventFlag)) { |
| NSK_COMPLAIN0("Missing ClassFileLoadHook event #1\n"); |
| nsk_jvmti_setFailStatus(); |
| } |
| |
| ClassFileLoadHookEventFlag = NSK_FALSE; |
| |
| /* resume debugee and wait for sync */ |
| if (!nsk_jvmti_resumeSync()) |
| return; |
| if (!nsk_jvmti_waitForSync(timeout)) |
| return; |
| |
| if (!redefine(jvmti, 2)) |
| nsk_jvmti_setFailStatus(); |
| |
| if (!NSK_VERIFY(ClassFileLoadHookEventFlag)) { |
| NSK_COMPLAIN0("Missing ClassFileLoadHook event #3\n"); |
| nsk_jvmti_setFailStatus(); |
| } |
| |
| if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB4(SetEventNotificationMode, |
| jvmti, JVMTI_DISABLE, JVMTI_EVENT_CLASS_FILE_LOAD_HOOK, NULL))) |
| nsk_jvmti_setFailStatus(); |
| |
| NSK_TRACE(NSK_CPP_STUB2(DeleteGlobalRef, jni, testedClass)); |
| |
| if (!nsk_jvmti_resumeSync()) |
| return; |
| } |
| |
| /* ========================================================================== */ |
| |
| /** Agent library initialization. */ |
| #ifdef STATIC_BUILD |
| JNIEXPORT jint JNICALL Agent_OnLoad_ma06t001a(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNICALL Agent_OnAttach_ma06t001a(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNI_OnLoad_ma06t001a(JavaVM *jvm, char *options, void *reserved) { |
| return JNI_VERSION_1_8; |
| } |
| #endif |
| jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) { |
| jvmtiEnv* jvmti = NULL; |
| jvmtiEventCallbacks callbacks; |
| jvmtiCapabilities caps; |
| |
| NSK_DISPLAY0("Agent_OnLoad\n"); |
| |
| if (!NSK_VERIFY(nsk_jvmti_parseOptions(options))) |
| return JNI_ERR; |
| |
| timeout = nsk_jvmti_getWaitTime() * 60 * 1000; |
| |
| if (!NSK_VERIFY((jvmti = |
| nsk_jvmti_createJVMTIEnv(jvm, reserved)) != NULL)) |
| return JNI_ERR; |
| |
| memset(&caps, 0, sizeof(caps)); |
| caps.can_redefine_classes = 1; |
| if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB2(AddCapabilities, jvmti, &caps))) |
| return JNI_ERR; |
| |
| if (!NSK_VERIFY(nsk_jvmti_setAgentProc(agentProc, NULL))) |
| return JNI_ERR; |
| |
| memset(&callbacks, 0, sizeof(callbacks)); |
| callbacks.ClassFileLoadHook = &ClassFileLoadHook; |
| if (!NSK_VERIFY(nsk_jvmti_init_MA(&callbacks))) |
| return JNI_ERR; |
| |
| if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB4(SetEventNotificationMode, |
| jvmti, JVMTI_ENABLE, JVMTI_EVENT_CLASS_FILE_LOAD_HOOK, NULL))) |
| return JNI_ERR; |
| |
| return JNI_OK; |
| } |
| |
| /* ========================================================================== */ |
| |
| #ifdef __cplusplus |
| } |
| #endif |
