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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 <jvmti.h>
#include "jni_tools.hpp"
#include "agent_common.hpp"
#include "JVMTITools.hpp"
extern "C" {
#define STATUS_FAILED 2
#define PASSED 0
#define NO_RESULTS 3
/* expected values of new instance fields */
static jint INTFLD = 333;
static jlong LONGFLD = 444;
#define STRFLD "completely new String field"
static jvmtiEnv *jvmti = nullptr;
static jvmtiCapabilities caps;
#ifdef STATIC_BUILD
JNIEXPORT jint JNICALL Agent_OnLoad_redefclass004(JavaVM *jvm, char *options, void *reserved) {
return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNICALL Agent_OnAttach_redefclass004(JavaVM *jvm, char *options, void *reserved) {
return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNI_OnLoad_redefclass004(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;
res = vm->GetEnv((void **) &jvmti, JVMTI_VERSION_1_1);
if (res != 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");
}
return JNI_OK;
}
JNIEXPORT jint JNICALL
Java_nsk_jvmti_RedefineClasses_redefclass004_makeRedefinition(JNIEnv *env,
jclass cls, jint vrb, jclass redefCls, jbyteArray classBytes) {
jvmtiError err;
jvmtiClassDefinition classDef;
int no_results = 0;
if (jvmti == nullptr) {
printf("JVMTI client was not properly loaded!\n");
return STATUS_FAILED;
}
if (!caps.can_redefine_classes) {
return PASSED;
}
/* fill the structure jvmtiClassDefinition */
classDef.klass = redefCls;
classDef.class_byte_count = env->GetArrayLength(classBytes);
classDef.class_bytes = (unsigned char *) env->GetByteArrayElements(classBytes, nullptr);
if (vrb == 1)
printf(">>>>>>>> Invoke RedefineClasses():\n\tnew class byte count=%d\n",
classDef.class_byte_count);
err = jvmti->RedefineClasses(1, &classDef);
if (err != JVMTI_ERROR_NONE) {
if (err == JVMTI_ERROR_UNSUPPORTED_REDEFINITION_SCHEMA_CHANGED) {
printf(
"Warning: unrestrictedly redefinition of classes is not implemented,\n"
"\tso the test has no results.\n");
no_results = 1;
}
else {
printf("%s: Failed to call RedefineClasses():\n\tthe function returned error %d: %s\n",
__FILE__, err, TranslateError(err));
printf("\tFor more info about this error see the JVMTI spec.\n");
}
if (no_results == 1) return NO_RESULTS;
else return JNI_ERR;
}
if (vrb == 1)
printf("<<<<<<<< RedefineClasses() is successfully done\n");
return PASSED;
}
JNIEXPORT jint JNICALL
Java_nsk_jvmti_RedefineClasses_redefclass004_checkNewFields(JNIEnv *env,
jobject obj, jint vrb, jobject redefObj) {
jclass redefCls = env->GetObjectClass(redefObj);
jfieldID fid;
jint intFld;
jlong longFld;
jstring stringObj;
const char *strFld = nullptr;
/* get value of new instance field "intComplNewFld" */
fid = env->GetFieldID(redefCls, "intComplNewFld", "I");
if (fid == nullptr) {
printf("%s: Failed to get the field ID for the field \"intComplNewFld\"\n",
__FILE__);
return STATUS_FAILED;
}
intFld = env->GetIntField(redefObj, fid);
/* get value of new instance field "longComplNewFld" */
fid = env->GetFieldID(redefCls, "longComplNewFld", "J");
if (fid == nullptr) {
printf("%s: Failed to get the field ID for the field \"longComplNewFld\"\n",
__FILE__);
return STATUS_FAILED;
}
longFld = env->GetLongField(redefObj, fid);
/* get value of new instance field "stringComplNewFld" */
fid = env->GetFieldID(redefCls, "stringComplNewFld", "Ljava/lang/String;");
if (fid == nullptr) {
printf("%s: Failed to get the field ID for the field \"stringComplNewFld\"\n",
__FILE__);
return STATUS_FAILED;
}
stringObj = (jstring) env->GetObjectField(redefObj, fid);
strFld = env->GetStringUTFChars(stringObj, 0);
if (intFld != INTFLD || longFld != LONGFLD ||
strcmp(strFld, STRFLD) != 0) {
printf("Completely new fields have not assigned their default values:\n");
printf("\tintComplNewFld = %d,\texpected %d\n",
intFld, INTFLD);
printf("\tlongComplNewFld = %" LL "d", longFld);
printf(",\texpected %" LL "d\n", LONGFLD);
printf("\tstringComplNewFld = \"%s\",\texpected \"%s\"\n",
strFld, STRFLD);
env->ReleaseStringUTFChars(stringObj, strFld);
return STATUS_FAILED;
} else {
if (vrb == 1) {
printf(
"Completely new fields:\n"
"\tstringComplNewFld = \"%s\"\n"
"\tintComplNewFld = %d\n"
"\tlongComplNewFld = %" LL "d\n",
strFld, intFld, longFld);
}
env->ReleaseStringUTFChars(stringObj, strFld);
return PASSED;
}
}
}
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