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/micro/org/openjdk/bench/java/lang/StringIndexOfChar.java
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test/micro/org/openjdk/bench/java/lang/StringIndexOfChar.java
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/*
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* Copyright Amazon.com Inc. 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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package org.openjdk.bench.java.lang;
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import java.util.Random;
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import org.openjdk.jmh.annotations.Benchmark;
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import org.openjdk.jmh.annotations.BenchmarkMode;
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import org.openjdk.jmh.annotations.Fork;
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import org.openjdk.jmh.annotations.Measurement;
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import org.openjdk.jmh.annotations.Param;
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import org.openjdk.jmh.annotations.OutputTimeUnit;
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import org.openjdk.jmh.annotations.Mode;
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import org.openjdk.jmh.annotations.Setup;
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import org.openjdk.jmh.annotations.Scope;
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import org.openjdk.jmh.annotations.State;
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import org.openjdk.jmh.annotations.Warmup;
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import org.openjdk.jmh.infra.Blackhole;
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import java.util.concurrent.TimeUnit;
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/**
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* This benchmark can be used to measure performance between StringLatin1 and StringUTF16 in terms of
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* performance of the indexOf(char) and indexOf(String) methods which are intrinsified.
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* On x86 the behaviour of the indexOf method is contingent upon the length of the string
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*/
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.NANOSECONDS)
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@State(Scope.Thread)
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@Warmup(iterations = 5, time = 1)
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@Measurement(iterations = 5, time = 1)
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@Fork(value = 1)
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public class StringIndexOfChar {
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@Param("100000")
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private int loops;
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@Param("1000")
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private int pathCnt;
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@Param("1999")
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private int rngSeed;
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private Random rng;
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private String[] latn1_short;
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private String[] latn1_sse4;
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private String[] latn1_avx2;
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private String[] latn1_mixedLength;
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private String[] utf16_short;
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private String[] utf16_sse4;
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private String[] utf16_avx2;
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private String[] utf16_mixedLength;
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@Setup
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public void setup() {
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rng = new Random(rngSeed);
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latn1_short = new String[pathCnt];
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latn1_sse4 = new String[pathCnt];
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latn1_avx2 = new String[pathCnt];
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latn1_mixedLength = new String[pathCnt];
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utf16_short = new String[pathCnt];
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utf16_sse4 = new String[pathCnt];
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utf16_avx2 = new String[pathCnt];
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utf16_mixedLength = new String[pathCnt];
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for (int i = 0; i < pathCnt; i++) {
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latn1_short[i] = makeRndString(false, 15);
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latn1_sse4[i] = makeRndString(false, 16);
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latn1_avx2[i] = makeRndString(false, 32);
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utf16_short[i] = makeRndString(true, 7);
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utf16_sse4[i] = makeRndString(true, 8);
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utf16_avx2[i] = makeRndString(true, 16);
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latn1_mixedLength[i] = makeRndString(false, rng.nextInt(65));
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utf16_mixedLength[i] = makeRndString(true, rng.nextInt(65));
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}
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}
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private String makeRndString(boolean isUtf16, int length) {
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StringBuilder sb = new StringBuilder(length);
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if(length > 0){
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sb.append(isUtf16?'\u2026':'b'); // ...
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for (int i = 1; i < length-1; i++) {
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sb.append((char)('b' + rng.nextInt(26)));
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}
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sb.append(rng.nextInt(3) >= 1?'a':'b');//66.6% of time 'a' is in string
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}
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return sb.toString();
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}
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@Benchmark
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public void latin1_mixed_char(Blackhole bh) {
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for (String what : latn1_mixedLength) {
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bh.consume(what.indexOf('a'));
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}
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}
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@Benchmark
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public void utf16_mixed_char(Blackhole bh) {
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for (String what : utf16_mixedLength) {
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bh.consume(what.indexOf('a'));
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}
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}
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@Benchmark
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public void latin1_mixed_String(Blackhole bh) {
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for (String what : latn1_mixedLength) {
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bh.consume(what.indexOf("a"));
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}
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}
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@Benchmark
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public void utf16_mixed_String(Blackhole bh) {
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for (String what : utf16_mixedLength) {
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bh.consume(what.indexOf("a"));
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}
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}
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////////// more detailed code path dependent tests //////////
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@Benchmark
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public void latin1_Short_char(Blackhole bh) {
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for (String what : latn1_short) {
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bh.consume(what.indexOf('a'));
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}
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}
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@Benchmark
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public void latin1_SSE4_char(Blackhole bh) {
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for (String what : latn1_sse4) {
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bh.consume(what.indexOf('a'));
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}
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}
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@Benchmark
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public void latin1_AVX2_char(Blackhole bh) {
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for (String what : latn1_avx2) {
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bh.consume(what.indexOf('a'));
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}
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}
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@Benchmark
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public void utf16_Short_char(Blackhole bh) {
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for (String what : utf16_short) {
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bh.consume(what.indexOf('a'));
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}
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}
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@Benchmark
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public void utf16_SSE4_char(Blackhole bh) {
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for (String what : utf16_sse4) {
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bh.consume(what.indexOf('a'));
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}
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}
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@Benchmark
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public void utf16_AVX2_char(Blackhole bh) {
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for (String what : utf16_avx2) {
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bh.consume(what.indexOf('a'));
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}
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}
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@Benchmark
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public void latin1_Short_String(Blackhole bh) {
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for (String what : latn1_short) {
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bh.consume(what.indexOf("a"));
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}
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}
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@Benchmark
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public void latin1_SSE4_String(Blackhole bh) {
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for (String what : latn1_sse4) {
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bh.consume(what.indexOf("a"));
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}
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}
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@Benchmark
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public void latin1_AVX2_String(Blackhole bh) {
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for (String what : latn1_avx2) {
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bh.consume(what.indexOf("a"));
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}
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}
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@Benchmark
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public void utf16_Short_String(Blackhole bh) {
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for (String what : utf16_short) {
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bh.consume(what.indexOf("a"));
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}
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}
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@Benchmark
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public void utf16_SSE4_String(Blackhole bh) {
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for (String what : utf16_sse4) {
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bh.consume(what.indexOf("a"));
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}
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}
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@Benchmark
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public void utf16_AVX2_String(Blackhole bh) {
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for (String what : utf16_avx2) {
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bh.consume(what.indexOf("a"));
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}
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}
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}
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