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/*
* Copyright (c) 2003, 2024, 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 <inttypes.h>
#include "jvmti.h"
#include "agent_common.hpp"
#include "JVMTITools.hpp"
extern "C" {
#define PASSED 0
#define STATUS_FAILED 2
typedef struct {
const char *name;
const char sig;
const jboolean stat;
const jint val;
jfieldID fid;
} field;
static jvmtiEnv *jvmti;
static jvmtiEventCallbacks callbacks;
static jvmtiCapabilities caps;
static jint result = PASSED;
static jboolean printdump = JNI_FALSE;
static jfieldID actual_fid = nullptr;
static char actual_sig = '\0';
static jint actual_val = 0;
static field flds[] = {
{ "fld0", 'I', JNI_TRUE, 42, nullptr },
{ "fld1", 'I', JNI_TRUE, 43, nullptr },
{ "fld2", 'I', JNI_FALSE, 44, nullptr },
{ "fld3", 'I', JNI_FALSE, 45, nullptr }
};
void JNICALL FieldModification(jvmtiEnv *jvmti_env, JNIEnv *env,
jthread thr, jmethodID method, jlocation location, jclass field_klass, jobject obj,
jfieldID field, char sig, jvalue new_value) {
if (printdump == JNI_TRUE) {
printf(">>> FieldModification, field: 0x%p", field);
printf(", signature: '%c', new value: %d\n", sig, new_value.i);
}
actual_fid = field;
actual_sig = sig;
actual_val = new_value.i;
}
#ifdef STATIC_BUILD
JNIEXPORT jint JNICALL Agent_OnLoad_setfmodw003(JavaVM *jvm, char *options, void *reserved) {
return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNICALL Agent_OnAttach_setfmodw003(JavaVM *jvm, char *options, void *reserved) {
return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNI_OnLoad_setfmodw003(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;
if (options != nullptr && strcmp(options, "printdump") == 0) {
printdump = JNI_TRUE;
}
res = jvm->GetEnv((void **) &jvmti, JVMTI_VERSION_1_1);
if (res != JNI_OK || jvmti == nullptr) {
printf("Wrong result of a valid call to GetEnv !\n");
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_generate_field_modification_events) {
callbacks.FieldModification = &FieldModification;
err = jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks));
if (err != JVMTI_ERROR_NONE) {
printf("(SetEventCallbacks) unexpected error: %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_SetFieldModificationWatch_setfmodw003_getReady(JNIEnv *env,
jclass cls) {
jvmtiError err;
size_t i;
if (!caps.can_generate_field_modification_events) {
return;
}
for (i = 0; i < sizeof(flds) / sizeof(field); i++) {
if (flds[i].stat == JNI_TRUE) {
flds[i].fid = env->GetStaticFieldID(cls, flds[i].name, "I");
} else {
flds[i].fid = env->GetFieldID(cls, flds[i].name, "I");
}
if (flds[i].fid == nullptr) {
printf("Unable to set field modif. watch on fld%" PRIuPTR ", fieldID=0", i);
} else {
if (printdump == JNI_TRUE) {
printf(">>> setting modification watch on fld%" PRIuPTR, i);
printf(", fieldID=0x%p\n", flds[i].fid);
}
err = jvmti->SetFieldModificationWatch(cls, flds[i].fid);
if (err != JVMTI_ERROR_NONE) {
printf("(SetFieldModificationWatch#%" PRIuPTR ") unexpected error:", i);
printf(" %s (%d)\n", TranslateError(err), err);
result = STATUS_FAILED;
}
}
}
err = jvmti->SetEventNotificationMode(JVMTI_ENABLE,
JVMTI_EVENT_FIELD_MODIFICATION, nullptr);
if (err != JVMTI_ERROR_NONE) {
printf("(SetEventNotificationMode) unexpected error: %s (%d)\n",
TranslateError(err), err);
result = STATUS_FAILED;
}
}
JNIEXPORT void JNICALL
Java_nsk_jvmti_SetFieldModificationWatch_setfmodw003_check(JNIEnv *env,
jclass cls, jint ind) {
if (!caps.can_generate_field_modification_events) {
return;
}
if (printdump == JNI_TRUE) {
printf(">>> checking on fld%d\n", ind);
}
if (actual_fid != flds[ind].fid) {
result = STATUS_FAILED;
printf("Field %s: thrown field ID expected=0x%p, actual=0x%p\n",
flds[ind].name, flds[ind].fid, actual_fid);
}
if (actual_sig != flds[ind].sig) {
result = STATUS_FAILED;
printf("Field %s: thrown sygnature type expected='%c', actual='%c'\n",
flds[ind].name, flds[ind].sig, actual_sig);
}
if (actual_val != flds[ind].val) {
result = STATUS_FAILED;
printf("Field %s: thrown new value expected=%d, actual=%d\n",
flds[ind].name, flds[ind].val, actual_val);
}
actual_fid = nullptr;
actual_sig = '\0';
actual_val = 0;
}
JNIEXPORT jint JNICALL
Java_nsk_jvmti_SetFieldModificationWatch_setfmodw003_getRes(JNIEnv *env,
jclass cls) {
return result;
}
}
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