89 lines
3.5 KiB
Java
89 lines
3.5 KiB
Java
/*
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* Copyright (c) 2019 SAP SE. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @bug 8221083
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* @requires vm.gc.Serial
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* @requires vm.bits == 64 & vm.opt.final.UseCompressedOops == true
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* @summary On ppc64, C1 erroneously emits a 32-bit compare instruction for oop compares.
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* @modules java.base/jdk.internal.misc:+open
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* @library /test/lib /
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run main/othervm -Xbatch -XX:-UseTLAB -Xmx4m -XX:+UseSerialGC -XX:HeapBaseMinAddress=0x700000000
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* -XX:CompileCommand=compileonly,compiler.codegen.TestOopCmp::nullTest
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* -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
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* compiler.codegen.TestOopCmp
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* @author volker.simonis@gmail.com
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*/
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package compiler.codegen;
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import jdk.test.whitebox.WhiteBox;
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public class TestOopCmp {
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private static Object nullObj = null;
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public static boolean nullTest(Object o) {
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if (o == nullObj) {
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return true;
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} else {
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return false;
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}
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}
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public static void main(String args[]) {
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WhiteBox WB = WhiteBox.getWhiteBox();
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// The test is started with -XX:HeapBaseMinAddress=0x700000000 and a
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// small heap of only 4mb. This works pretty reliable and at least on
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// Linux/Windows we will get a heap starting at 0x700000000.
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// The test also runs with -XX:+UseSerialGC which means that we'll get
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// eden starting at 0x700000000.
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// Calling 'System.gc()' will clean up all the objects from eden, so if
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// eden starts at 0x700000000 the first allocation right after the
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// system GC will be allcoated right at address 0x700000000.
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System.gc();
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String s = new String("I'm not null!!!");
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if (WB.getObjectAddress(s) == 0x700000000L) {
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System.out.println("Got object at address 0x700000000");
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}
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// We call 'nullTest()' with the newly allocated String object. If it was
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// allocated at 0x700000000, its 32 least-significant bits will be 0 and a
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// 32-bit comparison with 'nullObj' (which is 'null') will yield true and
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// result in a test failure.
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// If the code generated for 'nullTest()' correctly performs a 64-bit
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// comparison or if we didn't manage to allcoate 's' at 0x700000000 the
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// test will always succeed.
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for (int i = 0; i < 30_000; i++) {
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if (nullTest(s)) {
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throw new RuntimeException("Comparing non-null object with null returned 'true'");
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}
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}
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}
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}
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