undefect. CWE-407 — 63 sites patched across 27 ecosystems
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
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test/hotspot/jtreg/runtime/FieldLayout/BaseOffsets.java
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test/hotspot/jtreg/runtime/FieldLayout/BaseOffsets.java
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/*
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* Copyright (c) 2022, 2025, Oracle and/or its affiliates. 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 id=with-coops-with-ccp
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* @library /test/lib /
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* @requires vm.bits == "64"
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* @modules java.base/jdk.internal.misc
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* java.management
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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 -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseCompressedOops -XX:+UseCompressedClassPointers -XX:-UseCompactObjectHeaders BaseOffsets
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*/
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/*
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* @test id=no-coops-with-ccp
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* @library /test/lib /
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* @requires vm.bits == "64"
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* @modules java.base/jdk.internal.misc
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* java.management
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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 -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:-UseCompressedOops -XX:+UseCompressedClassPointers -XX:-UseCompactObjectHeaders BaseOffsets
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*/
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/*
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* @test id=with-coops-no-ccp
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* @library /test/lib /
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* @requires vm.bits == "64"
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* @modules java.base/jdk.internal.misc
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* java.management
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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 -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseCompressedOops -XX:-UseCompressedClassPointers -XX:-UseCompactObjectHeaders BaseOffsets
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*/
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/*
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* @test id=no-coops-no-ccp
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* @library /test/lib /
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* @requires vm.bits == "64"
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* @modules java.base/jdk.internal.misc
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* java.management
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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 -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:-UseCompressedOops -XX:-UseCompressedClassPointers -XX:-UseCompactObjectHeaders BaseOffsets
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*/
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/*
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* @test id=with-coop--with-coh
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* @library /test/lib /
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* @requires vm.bits == "64"
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* @modules java.base/jdk.internal.misc
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* java.management
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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 -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+UseCompressedOops -XX:+UseCompactObjectHeaders BaseOffsets
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*/
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/*
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* @test id=no-coops-with-coh
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* @library /test/lib /
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* @requires vm.bits == "64"
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* @modules java.base/jdk.internal.misc
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* java.management
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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 -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:-UseCompressedOops -XX:+UseCompactObjectHeaders BaseOffsets
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*/
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/*
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* @test id=32bit
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* @library /test/lib /
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* @requires vm.bits == "32"
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* @modules java.base/jdk.internal.misc
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* java.management
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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 -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI BaseOffsets
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*/
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import java.lang.reflect.Field;
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import java.util.Arrays;
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import java.util.Comparator;
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import jdk.internal.misc.Unsafe;
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import jdk.test.lib.Asserts;
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import jdk.test.lib.Platform;
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import jdk.test.whitebox.WhiteBox;
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public class BaseOffsets {
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static class LIClass {
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public int i;
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}
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public static final WhiteBox WB = WhiteBox.getWhiteBox();
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static final long INT_OFFSET;
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static final long INT_ARRAY_OFFSET;
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static final long LONG_ARRAY_OFFSET;
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static {
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if (!Platform.is64bit() || WB.getBooleanVMFlag("UseCompactObjectHeaders")) {
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INT_OFFSET = 8;
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INT_ARRAY_OFFSET = 12;
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LONG_ARRAY_OFFSET = 16;
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} else if (WB.getBooleanVMFlag("UseCompressedClassPointers")) {
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INT_OFFSET = 12;
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INT_ARRAY_OFFSET = 16;
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LONG_ARRAY_OFFSET = 16;
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} else {
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INT_OFFSET = 16;
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INT_ARRAY_OFFSET = 20;
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LONG_ARRAY_OFFSET = 24;
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}
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}
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static public void main(String[] args) {
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Unsafe unsafe = Unsafe.getUnsafe();
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Class c = LIClass.class;
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Field[] fields = c.getFields();
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for (int i = 0; i < fields.length; i++) {
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long offset = unsafe.objectFieldOffset(fields[i]);
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if (fields[i].getType() == int.class) {
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Asserts.assertEquals(offset, INT_OFFSET, "Misplaced int field");
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} else {
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Asserts.fail("Unexpected field type");
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}
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}
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Asserts.assertEquals(unsafe.arrayBaseOffset(boolean[].class), INT_ARRAY_OFFSET, "Misplaced boolean array base");
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Asserts.assertEquals(unsafe.arrayBaseOffset(byte[].class), INT_ARRAY_OFFSET, "Misplaced byte array base");
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Asserts.assertEquals(unsafe.arrayBaseOffset(char[].class), INT_ARRAY_OFFSET, "Misplaced char array base");
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Asserts.assertEquals(unsafe.arrayBaseOffset(short[].class), INT_ARRAY_OFFSET, "Misplaced short array base");
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Asserts.assertEquals(unsafe.arrayBaseOffset(int[].class), INT_ARRAY_OFFSET, "Misplaced int array base");
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Asserts.assertEquals(unsafe.arrayBaseOffset(long[].class), LONG_ARRAY_OFFSET, "Misplaced long array base");
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Asserts.assertEquals(unsafe.arrayBaseOffset(float[].class), INT_ARRAY_OFFSET, "Misplaced float array base");
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Asserts.assertEquals(unsafe.arrayBaseOffset(double[].class), LONG_ARRAY_OFFSET, "Misplaced double array base");
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boolean narrowOops = System.getProperty("java.vm.compressedOopsMode") != null ||
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!Platform.is64bit();
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long expected_objary_offset = narrowOops ? INT_ARRAY_OFFSET : LONG_ARRAY_OFFSET;
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Asserts.assertEquals(unsafe.arrayBaseOffset(Object[].class), expected_objary_offset, "Misplaced object array base");
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}
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}
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