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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/*
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* Copyright (c) 2023, 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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/*
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* @test
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* @bug 8299179
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* @summary ArrayFill: if store is on backedge, last iteration is not to be executed.
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* @library /test/lib
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* @compile TestBackedgeLoadArrayFill.jasm
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* @requires vm.compiler2.enabled
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* @run main/othervm
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* -XX:CompileCommand=compileonly,TestBackedgeLoadArrayFill*::test*
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* -XX:-TieredCompilation -Xcomp -XX:+OptimizeFill
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* TestBackedgeLoadArrayFillMain
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* @run main/othervm
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* -XX:CompileCommand=compileonly,TestBackedgeLoadArrayFill*::test*
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* -XX:-TieredCompilation -Xcomp -XX:+OptimizeFill
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* -XX:LoopUnrollLimit=1
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* TestBackedgeLoadArrayFillMain
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*/
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import jdk.test.lib.Asserts;
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public class TestBackedgeLoadArrayFillMain {
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static long[] longA;
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static int[] intA;
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static short[] shortA;
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static byte[] byteA;
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static class Data {
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long longValue;
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int intValue;
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short shortValue;
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byte byteValue;
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Data(int value) {
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longValue = (long) value;
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intValue = (int) value;
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shortValue = (short) value;
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longValue = (byte) value;
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}
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}
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public static long longSum() {
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long s = 0;
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for (long v : longA) { s += v; }
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return s;
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}
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public static int intSum() {
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int s = 0;
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for (int v : intA) { s += v; }
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return s;
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}
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public static short shortSum() {
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short s = 0;
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for (short v : shortA) { s += v; }
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return s;
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}
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public static byte byteSum() {
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byte s = 0;
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for (byte v : byteA) { s += v; }
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return s;
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}
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static void test_001() {
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// long seems not yet supported
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int i = 6;
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long arr[] = new long[22];
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do {
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arr[i] = 1;
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try {
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arr[i] = arr[i];
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} catch (Exception e) {
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}
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} while (++i < 20);
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longA = arr;
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}
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static void test_002() {
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// jint_fill
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int i = 6;
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int arr[] = new int[22];
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do {
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arr[i] = 1;
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try {
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arr[i] = arr[i];
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} catch (Exception e) {
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}
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} while (++i < 20);
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intA = arr;
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}
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static void test_003() {
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// jshort_fill
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int i = 6;
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short arr[] = new short[22];
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do {
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// first block of loop: copied before loop, and onto backedge -> store on backedge
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arr[i] = 1;
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// second block of loop
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try {
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arr[i] = arr[i];
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} catch (Exception e) {
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}
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} while (++i < 20);
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shortA = arr;
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}
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static void test_004() {
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// jbyte_fill
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int i = 6;
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byte arr[] = new byte[22];
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do {
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arr[i] = 1;
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try {
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arr[i] = arr[i];
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} catch (Exception e) {
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}
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} while (++i < 20);
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byteA = arr;
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}
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static void test_005() {
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// Note: currently unrolled, not intrinsified (unless -XX:LoopUnrollLimit=1)
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int arr[] = new int[22];
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for (int i = 6; i < 20; i++) {
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arr[i] = 1;
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}
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intA = arr;
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}
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static void test_006() {
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// Note: currently unrolled, not intrinsified (unless -XX:LoopUnrollLimit=1)
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// Load in normal body, because not moved to backedge during parsing.
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int i = 6;
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int arr[] = new int[22];
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do {
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arr[i] = 1;
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} while (++i < 20);
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intA = arr;
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}
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static void test_007() {
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int i = 6;
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int arr[] = new int[22];
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do {
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// still not on backedge [7,20) partial peel
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arr[i] = 1;
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try { int x = arr[i]; } catch (Exception e) {}
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} while (++i < 20);
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intA = arr;
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}
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static void test_008(Data data) {
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// Because of conditional in loop, at first not intrinsified, and also not unrolled.
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// After unswitching both loops are intrinsified.
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// I stole this idea from TestOptimizeFillWithStripMinedLoop.java
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int i = 6;
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int arr[] = new int[22];
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do {
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arr[i] = (data == null) ? 1 : data.intValue;
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} while (++i < 20);
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intA = arr;
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}
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static void test_009() {
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// Cast to int leads to "missing use of index", not intrinsified
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int arr[] = new int[22];
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for (long i = 6; i < 20; i++) {
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arr[(int)i] = 1;
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}
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intA = arr;
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}
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public static void main(String[] strArr) {
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test_001();
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Asserts.assertEQ(longSum(), (long)14);
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test_002();
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Asserts.assertEQ(intSum(), 14);
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test_003();
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Asserts.assertEQ(shortSum(), (short)14);
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test_004();
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Asserts.assertEQ(byteSum(), (byte)14);
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test_005();
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Asserts.assertEQ(intSum(), 14);
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test_006();
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Asserts.assertEQ(intSum(), 14);
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test_007();
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Asserts.assertEQ(intSum(), 14);
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test_008(new Data(1));
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Asserts.assertEQ(intSum(), 14);
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test_008(null);
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Asserts.assertEQ(intSum(), 14);
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test_009();
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Asserts.assertEQ(intSum(), 14);
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TestBackedgeLoadArrayFill t = new TestBackedgeLoadArrayFill();
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t.test_101();
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Asserts.assertEQ(intSum(), 15);
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t.test_102();
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Asserts.assertEQ(intSum(), 16);
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t.test_103();
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Asserts.assertEQ(intSum(), 14);
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t.test_104();
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Asserts.assertEQ(intSum(), 12);
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}
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}
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