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/*
* 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.
*/
/*
* Unit tests for JVMTI GetObjectSize function.
*
* Note: The tests here just test the relative size of objects. It's not
* possible to write tests that check for specific object sizes as this
* would be tied into the implementation and version.
*
*/
package nsk.jvmti.unit.heap;
import nsk.share.jvmti.unit.*;
import java.io.PrintStream;
import nsk.share.Consts;
public class ObjectSizeTests {
static class A {
static Object static_foo; // static field
Object foo;
}
static class B extends A {
Object bar; // instance field
Object more_bar; // instance field
static Object static_bar;
}
public static void main(String args[]) {
args = nsk.share.jvmti.JVMTITest.commonInit(args);
// produce JCK-like exit status.
System.exit(run(args, System.out) + Consts.JCK_STATUS_BASE);
}
public static int run(String args[], PrintStream out) {
// sizeof objects
long o_size = Heap.getObjectSize( new Object() );
long a_size = Heap.getObjectSize( new A() );
long b_size = Heap.getObjectSize( new B() );
System.out.println("Object size: " + o_size + " bytes");
System.out.println("A size: " + a_size + " bytes");
System.out.println("B size: " + b_size + " bytes");
if (o_size >= b_size) {
throw new RuntimeException("Expected instance of A to be the same or " +
"larger than java.lang.Object");
}
if (a_size >= b_size) {
throw new RuntimeException("Expected instance of B to be larger than A");
}
// sizeof classes
// - this is difficult to test so we just make a crude assumption
a_size = Heap.getObjectSize( A.class );
b_size = Heap.getObjectSize( B.class );
if (a_size > b_size) {
throw new RuntimeException("Expected class B to be larger than A");
}
return Consts.TEST_PASSED;
}
}
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