Add benchmarks, Closes #18

at-jmh/build.gradle

@@ -0,0 +1,63 @@
+plugins {
+    id 'java-library'
+    id 'net.minecraftforge.licenser'
+}
+
+configurations {
+    jmhOnly
+}
+
+repositories {
+    mavenCentral()
+}
+
+java {
+    toolchain.languageVersion = JavaLanguageVersion.of(8)
+    withSourcesJar()
+}
+
+license {
+    header = rootProject.file("LICENSE-header.txt")
+    newLine = false
+}
+
+dependencies {
+    implementation rootProject
+    implementation libs.jmh.core
+    implementation libs.asm
+
+    jmhOnly sourceSets.main.output
+    jmhOnly libs.bundles.jmh
+
+    annotationProcessor libs.jmh.generator.annprocess
+}
+
+tasks.register('jmh', JavaExec) {
+    dependsOn rootProject.tasks.named('build')
+    dependsOn sourceSets.main.output
+
+    javaLauncher.set(javaToolchains.launcherFor {
+        languageVersion = JavaLanguageVersion.of(17)
+    })
+    jvmArgs = [
+            '-p', sourceSets.main.runtimeClasspath.asPath,
+            '--add-modules', 'ALL-MODULE-PATH',
+    ]
+    classpath = files(configurations.jmhOnly.asPath)
+    mainClass = 'org.openjdk.jmh.Main'
+
+    args '-bm', 'avgt'  // benchmark mode
+    args '-r', '5s' // iteration time
+    args '-w', '5s' // warmup time
+    args '-wi', '2' // warmup iterations
+
+    // profilers
+    //args '-prof', 'stack'
+    args '-prof', "jfr:dir=${project.layout.buildDirectory.asFile.get()}/jfr"
+
+    args '-tu', 'us' // time unit
+    args '-i', '2' // iterations
+    args '-f', '1' // forks
+    args '-rff', project.file("${rootProject.layout.buildDirectory.asFile.get()}/jmh_results.txt") // results file
+    args 'net.minecraftforge.accesstransformer.benchmarks.AccessTransformerListBenchmark'
+}

at-jmh/src/main/java/net/minecraftforge/accesstransformer/benchmarks/AccessTransformerListBenchmark.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) Forge Development LLC
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+package net.minecraftforge.accesstransformer.benchmarks;
+
+import net.minecraftforge.accesstransformer.parser.AccessTransformerList;
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.infra.Blackhole;
+import org.objectweb.asm.Type;
+
+@State(Scope.Benchmark)
+public class AccessTransformerListBenchmark {
+    private AccessTransformerList staticList;
+
+    @Setup
+    public void setup() throws Exception {
+        staticList = new AccessTransformerList();
+        staticList.loadFromResource("accesstransformer_forge_119.cfg");
+        staticList.loadFromResource("accesstransformer_firstaid_119.cfg");
+        staticList.loadFromResource("accesstransformer_jei_119.cfg");
+    }
+
+    @Benchmark
+    public void testATLoad(Blackhole blackhole) throws Exception {
+        AccessTransformerList list = new AccessTransformerList();
+        list.loadFromResource("accesstransformer_forge_119.cfg");
+        list.loadFromResource("accesstransformer_firstaid_119.cfg");
+        list.loadFromResource("accesstransformer_jei_119.cfg");
+        blackhole.consume(list);
+    }
+
+    @Benchmark
+    public void testAtContainsMiss(Blackhole blackhole) throws Exception {
+        if (staticList.containsClassTarget(Type.getObjectType("net/minecraft/client/gui/font/FontManager")))
+            throw new RuntimeException("Didn't expect to find FontManager!");
+    }
+
+    @Benchmark
+    public void testAtContainsHit(Blackhole blackhole) throws Exception {
+        if (!staticList.containsClassTarget(Type.getObjectType("net/minecraft/client/gui/Gui")))
+            throw new RuntimeException("Expected to find Gui!");
+    }
+}

at-jmh/src/main/resources/accesstransformer_firstaid_119.cfg

@@ -0,0 +1,23 @@
+public net.minecraft.client.gui.Gui f_92976_ # healthUpdateCounter
+
+public-f net.minecraft.world.entity.Entity f_19804_ # dataManager
+
+public net.minecraft.server.level.ServerLevel f_8550_ # allPlayersSleeping
+
+public net.minecraft.world.entity.LivingEntity m_21262_(Lnet/minecraft/world/damagesource/DamageSource;)Z # checkTotemDeathProtection
+public net.minecraft.world.entity.LivingEntity f_20961_ # HEALTH
+
+public net.minecraft.world.entity.player.Player f_36107_ # ABSORPTION
+
+public net.minecraft.network.syncher.SynchedEntityData m_135375_(Lnet/minecraft/network/syncher/SynchedEntityData$DataItem;Lnet/minecraft/network/syncher/SynchedEntityData$DataItem;)V # setEntryValue
+public net.minecraft.network.syncher.SynchedEntityData m_135379_(Lnet/minecraft/network/syncher/EntityDataAccessor;)Lnet/minecraft/network/syncher/SynchedEntityData$DataItem; # getEntry
+
+public net.minecraft.world.item.enchantment.EnchantmentHelper m_44850_(Lnet/minecraft/world/item/enchantment/EnchantmentHelper$EnchantmentVisitor;Lnet/minecraft/world/item/ItemStack;)V # runIterationOnItem
+public net.minecraft.world.item.enchantment.EnchantmentHelper$EnchantmentVisitor
+
+# For FirstaidIngameGui
+public net.minecraft.client.gui.Gui f_92989_ #tickCount
+public net.minecraft.client.gui.Gui f_92973_ #lastHealth
+public net.minecraft.client.gui.Gui f_92975_ #lastHealthTime
+public net.minecraft.client.gui.Gui f_92974_ #displayHealth
+public net.minecraft.client.gui.Gui f_92985_ #random