1 /*
 2  * Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 4  *
 5  * This code is free software; you can redistribute it and/or modify it
 6  * under the terms of the GNU General Public License version 2 only, as
 7  * published by the Free Software Foundation.
 8  *
 9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  */
23 
24 #include <jvmti.h>
25 #include <cstdlib>
26 #include <cstring>
27 
28 namespace {
29 jvmtiEnv *jvmti = nullptr;
30 
31 void checkJvmti(int code, const char* message) {
32   if (code != JVMTI_ERROR_NONE) {
33     printf("Error %s: %d\n", message, code);
34     abort();
35   }
36 }
37 
38 }
39 
40 extern "C" JNIEXPORT jint JNICALL Java_ValueGetObjectHashCodeTest_getHash0(JNIEnv* jni_env, jclass clazz, jobject object) {
41   jint hash = 0;
42   jvmtiError err = jvmti->GetObjectHashCode(object, &hash);
43   checkJvmti(err, "GetObjectHashCode failed");
44   return hash;
45 }
46 
47 extern "C" JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM *vm, char *options, void *reserved) {
48   if (vm->GetEnv(reinterpret_cast<void **>(&jvmti), JVMTI_VERSION) != JNI_OK || !jvmti) {
49     printf("Could not initialize JVMTI\n");
50     abort();
51   }
52   return JVMTI_ERROR_NONE;
53 }
54