| /* |
| * 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 <stdio.h> |
| #include <string.h> |
| #include "jvmti.h" |
| #include "agent_common.h" |
| #include "JVMTITools.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| #ifndef JNI_ENV_ARG |
| |
| #ifdef __cplusplus |
| #define JNI_ENV_ARG(x, y) y |
| #define JNI_ENV_PTR(x) x |
| #else |
| #define JNI_ENV_ARG(x,y) x, y |
| #define JNI_ENV_PTR(x) (*x) |
| #endif |
| |
| #endif |
| |
| #define PASSED 0 |
| #define STATUS_FAILED 2 |
| |
| typedef struct { |
| char *class; |
| char *name; |
| char *sig; |
| int stat; |
| jfieldID fid; |
| } field; |
| |
| static jvmtiEnv *jvmti; |
| static jvmtiEventCallbacks callbacks; |
| static jvmtiCapabilities caps; |
| static jint result = PASSED; |
| static jfieldID thrown_fid = NULL; |
| static field fields[] = { |
| {"nsk/jvmti/ClearFieldModificationWatch/clrfmodw001", "fld0", "I", 0, NULL}, |
| {"nsk/jvmti/ClearFieldModificationWatch/clrfmodw001", "fld1", "I", 1, NULL}, |
| {"nsk/jvmti/ClearFieldModificationWatch/clrfmodw001", "fld2", |
| "Lnsk/jvmti/ClearFieldModificationWatch/clrfmodw001a;", 0, NULL}, |
| {"nsk/jvmti/ClearFieldModificationWatch/clrfmodw001a", "fld3", "[I", 0, NULL}, |
| {"nsk/jvmti/ClearFieldModificationWatch/clrfmodw001b", "fld4", "F", 0, NULL}, |
| }; |
| |
| void switchWatch(JNIEnv *env, jint ind, jboolean on) { |
| jvmtiError err; |
| jclass cls; |
| field fld = fields[ind]; |
| char *msg; |
| |
| cls = JNI_ENV_PTR(env)->FindClass(JNI_ENV_ARG(env, fld.class)); |
| if (fld.fid == NULL) { |
| if (fld.stat) { |
| fields[ind].fid = JNI_ENV_PTR(env)-> |
| GetStaticFieldID(JNI_ENV_ARG(env, cls), fld.name, fld.sig); |
| } else { |
| fields[ind].fid = JNI_ENV_PTR(env)-> |
| GetFieldID(JNI_ENV_ARG(env, cls), fld.name, fld.sig); |
| } |
| } |
| |
| if (on == JNI_TRUE) { |
| msg = "Set"; |
| err = (*jvmti)->SetFieldModificationWatch(jvmti, cls, fields[ind].fid); |
| } else { |
| msg = "Clear"; |
| err = (*jvmti)->ClearFieldModificationWatch(jvmti, cls, fields[ind].fid); |
| } |
| if (err == JVMTI_ERROR_MUST_POSSESS_CAPABILITY && |
| !caps.can_generate_field_modification_events) { |
| /* Ok, it's expected */ |
| } else if (err != JVMTI_ERROR_NONE) { |
| printf("(%sFieldModificationWatch#%d) unexpected error: %s (%d)\n", |
| msg, ind, TranslateError(err), err); |
| result = STATUS_FAILED; |
| } |
| } |
| |
| void JNICALL FieldModification(jvmtiEnv *jvmti_env, JNIEnv *env, |
| jthread thd, jmethodID mid, jlocation loc, jclass field_klass, jobject obj, |
| jfieldID field, char sig, jvalue new_value) { |
| thrown_fid = field; |
| } |
| |
| #ifdef STATIC_BUILD |
| JNIEXPORT jint JNICALL Agent_OnLoad_clrfmodw001(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNICALL Agent_OnAttach_clrfmodw001(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNI_OnLoad_clrfmodw001(JavaVM *jvm, char *options, void *reserved) { |
| return JNI_VERSION_1_8; |
| } |
| #endif |
| jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) { |
| jint res; |
| jvmtiError err; |
| |
| res = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **) &jvmti), |
| JVMTI_VERSION_1_1); |
| if (res != JNI_OK || jvmti == NULL) { |
| printf("Wrong result of a valid call to GetEnv !\n"); |
| return JNI_ERR; |
| } |
| |
| err = (*jvmti)->GetPotentialCapabilities(jvmti, &caps); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(GetPotentialCapabilities) unexpected error: %s (%d)\n", |
| TranslateError(err), err); |
| return JNI_ERR; |
| } |
| |
| err = (*jvmti)->AddCapabilities(jvmti, &caps); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(AddCapabilities) unexpected error: %s (%d)\n", |
| TranslateError(err), err); |
| return JNI_ERR; |
| } |
| |
| err = (*jvmti)->GetCapabilities(jvmti, &caps); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(GetCapabilities) unexpected error: %s (%d)\n", |
| TranslateError(err), err); |
| return JNI_ERR; |
| } |
| |
| if (caps.can_generate_field_modification_events) { |
| callbacks.FieldModification = &FieldModification; |
| err = (*jvmti)->SetEventCallbacks(jvmti, &callbacks, sizeof(callbacks)); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(SetEventCallbacks) unexpected error: %s (%d)\n", |
| TranslateError(err), err); |
| return JNI_ERR; |
| } |
| |
| err = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, |
| JVMTI_EVENT_FIELD_MODIFICATION, NULL); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("Failed to enable JVMTI_EVENT_FIELD_MODIFICATION: %s (%d)\n", |
| TranslateError(err), err); |
| return JNI_ERR; |
| } |
| } else { |
| printf("Warning: FieldModification watch is not implemented\n"); |
| } |
| |
| return JNI_OK; |
| } |
| |
| JNIEXPORT void JNICALL |
| Java_nsk_jvmti_ClearFieldModificationWatch_clrfmodw001_setWatch(JNIEnv *env, jclass cls, jint fld_ind) { |
| switchWatch(env, fld_ind, JNI_TRUE); |
| } |
| |
| JNIEXPORT void JNICALL |
| Java_nsk_jvmti_ClearFieldModificationWatch_clrfmodw001_clearWatch(JNIEnv *env, jclass cls, jint fld_ind) { |
| switchWatch(env, fld_ind, JNI_FALSE); |
| } |
| |
| JNIEXPORT void JNICALL Java_nsk_jvmti_ClearFieldModificationWatch_clrfmodw001_touchfld0(JNIEnv *env, jobject obj) { |
| JNI_ENV_PTR(env)->SetIntField(JNI_ENV_ARG(env, obj), fields[0].fid, 2000); |
| } |
| |
| JNIEXPORT void JNICALL |
| Java_nsk_jvmti_ClearFieldModificationWatch_clrfmodw001_check(JNIEnv *env, jclass cls, jint fld_ind, jboolean flag) { |
| if (caps.can_generate_field_modification_events) { |
| if (flag == JNI_FALSE && thrown_fid != NULL) { |
| result = STATUS_FAILED; |
| printf("(Field %d) ", fld_ind); |
| printf("FieldModification event without modification watch set\n"); |
| } else if (flag == JNI_TRUE && thrown_fid != fields[fld_ind].fid) { |
| result = STATUS_FAILED; |
| printf("(Field %d) thrown field ID expected: 0x%p, got: 0x%p\n", |
| fld_ind, fields[fld_ind].fid, thrown_fid); |
| } |
| thrown_fid = NULL; |
| } |
| } |
| |
| JNIEXPORT jint JNICALL Java_nsk_jvmti_ClearFieldModificationWatch_clrfmodw001_getRes(JNIEnv *env, jclass cls) { |
| return result; |
| } |
| |
| #ifdef __cplusplus |
| } |
| #endif |
