jdk-24/test/micro/org/openjdk/bench/jdk/classfile/ReadMetadata.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * accompanied this code).
 *
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package org.openjdk.bench.jdk.classfile;

import java.lang.reflect.AccessFlag;
import jdk.internal.classfile.ClassElement;
import jdk.internal.classfile.ClassModel;
import jdk.internal.classfile.Classfile;
import jdk.internal.classfile.FieldModel;
import jdk.internal.org.objectweb.asm.*;
import jdk.internal.org.objectweb.asm.tree.*;
import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.infra.Blackhole;

public class ReadMetadata extends AbstractCorpusBenchmark {

    @Benchmark
    @BenchmarkMode(Mode.Throughput)
    public void asmStreamReadName(Blackhole bh) {
        for (byte[] bytes : classes) {
            ClassReader cr = new ClassReader(bytes);
            var  visitor = new ClassVisitor(Opcodes.ASM9) {
                String theName;

                @Override
                public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
                    theName = name;
                }
            };
            cr.accept(visitor, 0);
            bh.consume(visitor.theName);
        }
    }

    @Benchmark
    @BenchmarkMode(Mode.Throughput)
    public void asmTreeReadName(Blackhole bh) {
        for (byte[] bytes : classes) {
            ClassNode node = new ClassNode();
            ClassReader cr = new ClassReader(bytes);
            cr.accept(node, 0);
            bh.consume(node.name);
        }
    }

    @Benchmark
    @BenchmarkMode(Mode.Throughput)
    public void jdkReadName(Blackhole bh) {
        for (byte[] bytes : classes) {
            bh.consume(Classfile.parse(bytes).thisClass().asInternalName());
        }
    }

    @Benchmark
    @BenchmarkMode(Mode.Throughput)
    public void asmStreamCountFields(Blackhole bh) {
        for (byte[] bytes : classes) {
            ClassReader cr = new ClassReader(bytes);
            var visitor = new ClassVisitor(Opcodes.ASM9) {
                int count;

                @Override
                public FieldVisitor visitField(int access, String name, String descriptor, String signature, Object value) {
                    if ((access & Opcodes.ACC_PUBLIC) != 1) {
                        ++count;
                    }
                    return null;
                }
            };
            cr.accept(visitor, 0);
            bh.consume(visitor.count);
        }
    }

    @Benchmark
    @BenchmarkMode(Mode.Throughput)
    public void asmTreeCountFields(Blackhole bh) {
        for (byte[] bytes : classes) {
            int count = 0;
            ClassNode node = new ClassNode();
            ClassReader cr = new ClassReader(bytes);
            cr.accept(node, 0);
            for (FieldNode fn : node.fields)
                if ((fn.access & Opcodes.ACC_PUBLIC) != 1) {
                    ++count;
                }
            bh.consume(count);
        }
    }

    @Benchmark
    @BenchmarkMode(Mode.Throughput)
    public void jdkTreeCountFields(Blackhole bh) {
        for (byte[] bytes : classes) {
            int count = 0;
            ClassModel cm = Classfile.parse(bytes);
            for (FieldModel fm : cm.fields())
                if (!fm.flags().has(AccessFlag.PUBLIC)) {
                    ++count;
                }
            bh.consume(count);
        }
    }

    @Benchmark
    @BenchmarkMode(Mode.Throughput)
    public void jdkCountFields(Blackhole bh) {
        for (byte[] bytes : classes) {
            int count = 0;
            ClassModel cm = Classfile.parse(bytes);
            for (ClassElement ce : cm) {
                if (ce instanceof FieldModel fm) {
                    if (!fm.flags().has(AccessFlag.PUBLIC)) {
                        ++count;
                    }
                }
            }
            bh.consume(count);
        }
    }
}