90bd544512
Reviewed-by: ecaspole, jvernee
165 lines
6.1 KiB
Java
165 lines
6.1 KiB
Java
/*
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* Copyright (c) 2024, 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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package org.openjdk.bench.jdk.classfile;
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import java.lang.classfile.constantpool.ConstantPoolBuilder;
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import java.lang.constant.ClassDesc;
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import java.util.LinkedHashSet;
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import java.util.List;
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import java.util.concurrent.TimeUnit;
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import org.openjdk.jmh.annotations.*;
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import org.openjdk.jmh.infra.Blackhole;
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import static java.lang.constant.ConstantDescs.*;
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import static org.openjdk.bench.jdk.classfile.TestConstants.*;
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/**
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* Tests constant pool builder lookup performance for ClassEntry.
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* Note that ClassEntry is available only for reference types.
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*/
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@Warmup(iterations = 3)
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@Measurement(iterations = 5)
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@OutputTimeUnit(TimeUnit.MILLISECONDS)
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@BenchmarkMode(Mode.Throughput)
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@Fork(value = 1, jvmArgs = {"--enable-preview"})
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@State(Scope.Benchmark)
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public class ConstantPoolBuildingClassEntry {
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// JDK-8338546
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ConstantPoolBuilder builder;
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List<ClassDesc> classDescs;
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List<ClassDesc> nonIdenticalClassDescs;
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List<String> internalNames;
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List<ClassDesc> nonDuplicateClassDescs;
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List<String> nonDuplicateInternalNames;
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int size;
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@Setup(Level.Iteration)
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public void setup() {
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builder = ConstantPoolBuilder.of();
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// Note these can only be reference types, no primitives
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classDescs = List.of(
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CD_Byte, CD_Object, CD_Long.arrayType(), CD_String, CD_String, CD_Object, CD_Short,
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CD_MethodHandle, CD_MethodHandle, CD_Object, CD_Character, CD_List, CD_ArrayList,
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CD_List, CD_Set, CD_Integer, CD_Object.arrayType(), CD_Enum, CD_Object, CD_MethodHandles_Lookup,
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CD_Long, CD_Set, CD_Object, CD_Character, CD_Integer, CD_System, CD_String, CD_String,
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CD_CallSite, CD_Collection, CD_List, CD_Collection, CD_String, CD_int.arrayType()
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);
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size = classDescs.size();
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nonIdenticalClassDescs = classDescs.stream().map(cd -> {
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var ret = ClassDesc.ofDescriptor(new String(cd.descriptorString()));
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ret.hashCode(); // pre-compute hash code for cd
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return ret;
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}).toList();
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internalNames = classDescs.stream().map(cd -> {
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// also sets up builder
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cd.hashCode(); // pre-computes hash code for cd
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var ce = builder.classEntry(cd);
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var ret = ce.name().stringValue();
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ret.hashCode(); // pre-computes hash code for stringValue
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return ret;
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}).toList();
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nonDuplicateClassDescs = List.copyOf(new LinkedHashSet<>(classDescs));
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nonDuplicateInternalNames = nonDuplicateClassDescs.stream().map(cd ->
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builder.classEntry(cd).asInternalName()).toList();
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}
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// Copied from jdk.internal.classfile.impl.Util::toInternalName
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// to reduce internal dependencies
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public static String toInternalName(ClassDesc cd) {
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var desc = cd.descriptorString();
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if (desc.charAt(0) == 'L')
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return desc.substring(1, desc.length() - 1);
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throw new IllegalArgumentException(desc);
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}
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/**
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* Looking up with identical ClassDesc objects. Happens in bytecode generators reusing
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* constant CD_Xxx.
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*/
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@Benchmark
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public void identicalLookup(Blackhole bh) {
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for (var cd : classDescs) {
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bh.consume(builder.classEntry(cd));
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}
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}
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/**
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* Looking up with non-identical ClassDesc objects. Happens in bytecode generators
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* using ad-hoc Class.describeConstable().orElseThrow() or other parsed ClassDesc.
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* Cannot use identity fast path compared to {@link #identicalLookup}.
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*/
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@Benchmark
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public void nonIdenticalLookup(Blackhole bh) {
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for (var cd : nonIdenticalClassDescs) {
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bh.consume(builder.classEntry(cd));
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}
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}
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/**
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* Looking up with internal names. Closest to ASM behavior.
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* Baseline for {@link #identicalLookup}.
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*/
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@Benchmark
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public void internalNameLookup(Blackhole bh) {
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for (var name : internalNames) {
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bh.consume(builder.classEntry(builder.utf8Entry(name)));
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}
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}
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/**
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* The default implementation provided by {@link ConstantPoolBuilder#classEntry(ClassDesc)}.
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* Does substring so needs to rehash and has no caching, should be very slow.
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*/
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@Benchmark
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public void oldStyleLookup(Blackhole bh) {
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for (var cd : classDescs) {
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var s = cd.isClassOrInterface() ? toInternalName(cd) : cd.descriptorString();
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bh.consume(builder.classEntry(builder.utf8Entry(s)));
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}
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}
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/**
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* Measures performance of creating new class entries in new constant pools with symbols.
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*/
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@Benchmark
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public void freshCreationWithDescs(Blackhole bh) {
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var cp = ConstantPoolBuilder.of();
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for (var cd : nonDuplicateClassDescs) {
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bh.consume(cp.classEntry(cd));
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}
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}
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/**
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* Measures performance of creating new class entries in new constant pools with internal names.
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*/
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@Benchmark
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public void freshCreationWithInternalNames(Blackhole bh) {
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var cp = ConstantPoolBuilder.of();
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for (var name : nonDuplicateInternalNames) {
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bh.consume(cp.classEntry(cp.utf8Entry(name)));
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}
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}
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}
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