97 lines
3.9 KiB
Java
97 lines
3.9 KiB
Java
/*
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* Copyright (c) 2021 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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/**
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* @test
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* @requires vm.gc.Serial
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* @bug 8262295
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* @library /test/lib /
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* @summary Out of bounds array load on clone source crashes GC which
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* interpretes the loaded value as oop. A small heap is configured to
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* get a lot of GCs.
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*
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* @comment C2 generates the out of bounds load with serial, parallel and
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* shenandoah gc but not with g1 and z gc. For simplicity serial gc is
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* configured.
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*
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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 -XX:+UseSerialGC -Xmx128m
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* -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
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* -XX:-BackgroundCompilation
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* -XX:CompileCommand=dontinline,*::*_dontinline
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* compiler.arraycopy.TestOutOfBoundsArrayLoad
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*/
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package compiler.arraycopy;
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import compiler.whitebox.CompilerWhiteBoxTest;
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public class TestOutOfBoundsArrayLoad {
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public static Object escape1;
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public static Object escape2;
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public static void main(String[] args_ignored) {
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try {
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Object[] arrNotEmpty = {null, null, null, null, null, };
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// Warm-up
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for (int i = CompilerWhiteBoxTest.THRESHOLD; i > 0; i--) {
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testMethod_dontinline(arrNotEmpty);
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}
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// Call testmethod with empty array often enough to trigger GC.
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// GC is assumed to crash.
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for (int i = 20_000_000; i > 0; i--) {
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// Trick for ParallelGC: empty[4] will be loaded in the testmethod
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// (out of bounds!) and interpreted as oop (or
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// narrowOop). PSScavenge::should_scavenge() will skip the loaded
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// value if it is before the young generation. So before calling the
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// test method we allocate the empty array and an array of -1 values
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// right behind it. So empty[4] will likely result in
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// 0xffffffffffffffff Which is not before the young generation.
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Object[] empty = new Object[0];
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long[] l = new long[4];
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l[0] = -1L; l[1] = -1L; l[2] = -1L; l[3] = -1L;
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escape2 = l;
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testMethod_dontinline(empty);
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}
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} catch (Throwable t) {
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t.printStackTrace();
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System.exit(1);
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}
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}
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public static void testMethod_dontinline(Object[] src) throws Exception {
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Object[] clone = src.clone();
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// Load L below is executed speculatively at this point from src without range check.
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// The result is put into the OopMap of the allocation in the next line.
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// If src.length is 0 then the loaded value is no heap reference and GC crashes.
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escape1 = new Object();
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if (src.length > 4) {
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escape2 = clone[4]; // Load L
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}
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}
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}
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