Add JADX decompiler

build.gradle

@@ -65,6 +65,12 @@ dependencies {
 	implementation "net.fabricmc:cfr:${fabric_cfr_version}"
 	implementation "org.vineflower:vineflower:${vineflower_version}"
 	implementation "org.bitbucket.mstrobel:procyon-compilertools:${procyon_version}"
+	implementation ("io.github.skylot:jadx-core:${jadx_version}") {
+		exclude group: 'com.android.tools.build', module: 'aapt2-proto'
+	}
+	implementation ("io.github.skylot:jadx-java-input:${jadx_version}") {
+		exclude group: 'io.github.skylot', module: 'raung-disasm'
+	}
 	runtimeOnly "org.tinylog:tinylog-impl:${tinylog_version}"
 	runtimeOnly "org.tinylog:slf4j-tinylog:${tinylog_version}"
 
@@ -97,6 +103,11 @@ extraJavaModuleInfo {
 
 	// Procyon
 	automaticModule("org.bitbucket.mstrobel:procyon-compilertools", "procyon.compilertools")
+
+	// JADX
+	automaticModule("io.github.skylot:jadx-core", "jadx.core")
+	automaticModule("io.github.skylot:jadx-plugins-api", "jadx.plugins.api")
+	automaticModule("io.github.skylot:jadx-java-input", "jadx.plugins.java_input")
 }
 
 application {

gradle.properties

@@ -14,6 +14,7 @@ asm_version = 9.6
 fabric_cfr_version = 0.2.1
 vineflower_version = 1.9.3
 procyon_version = 0.6.0
+jadx_version = 1.4.7
 mappingio_version = 0.5.0
 javaparser_version = 3.25.6
 javafx_version = 21.0.1

src/main/java/matcher/Util.java

@@ -2,6 +2,8 @@
 
 import java.io.Closeable;
 import java.io.IOException;
+import java.io.PrintWriter;
+import java.io.StringWriter;
 import java.io.UncheckedIOException;
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -48,6 +50,15 @@ public static <T> Set<T> copySet(Set<T> set) {
 		}
 	}
 
+	public static String getStackTrace(Throwable t) {
+		if (t == null) return null;
+
+		StringWriter sw = new StringWriter();
+		PrintWriter pw = new PrintWriter(sw);
+		t.printStackTrace(pw);
+		return sw.toString();
+	}
+
 	public static FileSystem iterateJar(Path archive, boolean autoClose, Consumer<Path> handler) {
 		boolean existing = false;
 		FileSystem fs = null;

src/main/java/matcher/srcprocess/BuiltinDecompiler.java

@@ -5,6 +5,7 @@
 public enum BuiltinDecompiler {
 	CFR("CFR", Cfr::new),
 	VINEFLOWER("Vineflower", Vineflower::new),
+	JADX("JADX", Jadx::new),
 	PROCYON("Procyon", Procyon::new);
 
 	BuiltinDecompiler(String name, Supplier<? extends Decompiler> supplier) {

src/main/java/matcher/srcprocess/Jadx.java

@@ -0,0 +1,75 @@
+package matcher.srcprocess;
+
+import java.io.IOException;
+import java.util.function.Consumer;
+
+import jadx.api.CommentsLevel;
+import jadx.api.JadxArgs;
+import jadx.api.JadxDecompiler;
+import jadx.api.impl.NoOpCodeCache;
+import jadx.api.plugins.input.data.IClassData;
+import jadx.api.plugins.input.data.ILoadResult;
+import jadx.api.plugins.input.data.IResourceData;
+import jadx.plugins.input.java.JavaClassReader;
+import jadx.plugins.input.java.data.JavaClassData;
+
+import matcher.NameType;
+import matcher.Util;
+import matcher.type.ClassFeatureExtractor;
+import matcher.type.ClassInstance;
+
+public class Jadx implements Decompiler {
+	@Override
+	public String decompile(ClassInstance cls, ClassFeatureExtractor env, NameType nameType) {
+		String errorMessage = null;
+		final String fullClassName = cls.getName(NameType.PLAIN, true);
+
+		try (JadxDecompiler jadx = new JadxDecompiler(jadxArgs)) {
+			jadx.addCustomLoad(new ILoadResult() {
+				@Override
+				public void close() throws IOException { }
+
+				@Override
+				public void visitClasses(Consumer<IClassData> consumer) {
+					consumer.accept(new JavaClassData(new JavaClassReader(0,
+							fullClassName + ".class", cls.serialize(nameType))));
+				}
+
+				@Override
+				public void visitResources(Consumer<IResourceData> consumer) { }
+
+				@Override
+				public boolean isEmpty() {
+					return false;
+				}
+			});
+			jadx.load();
+
+			assert jadx.getClassesWithInners().size() == 1;
+			return jadx.getClassesWithInners().get(0).getCode();
+		} catch (Exception e) {
+			errorMessage = Util.getStackTrace(e);
+		}
+
+		throw new RuntimeException(errorMessage != null ? errorMessage : "JADX couldn't find the requested class");
+	}
+
+	private static final JadxArgs jadxArgs;
+
+	static {
+		jadxArgs = new JadxArgs() {
+			@Override
+			public void close() {
+				return;
+			}
+		};
+		jadxArgs.setCodeCache(NoOpCodeCache.INSTANCE);
+		jadxArgs.setShowInconsistentCode(true);
+		jadxArgs.setInlineAnonymousClasses(false);
+		jadxArgs.setInlineMethods(false);
+		jadxArgs.setSkipResources(true);
+		jadxArgs.setRenameValid(false);
+		jadxArgs.setRespectBytecodeAccModifiers(true);
+		jadxArgs.setCommentsLevel(CommentsLevel.INFO);
+	}
+}

src/main/java/module-info.java

@@ -26,6 +26,9 @@
 	requires org.objectweb.asm.tree.analysis;
 	requires org.objectweb.asm.util;
 	requires procyon.compilertools;
+	requires jadx.core;
+	requires jadx.plugins.api;
+	requires jadx.plugins.java_input;
 	requires transitive net.fabricmc.mappingio;
 
 	uses matcher.Plugin;

src/main/resources/tinylog-dev.properties

@@ -1,3 +1,5 @@
 writer = console
 writer.format = {date: HH:mm:ss.SSS} [{thread}/{level}]: {message}
 writer.level = debug
+
+level@jadx = warn

src/main/resources/tinylog.properties

@@ -1,3 +1,5 @@
 writer = console
 writer.format = {date: HH:mm:ss} [{level}]: {message}
 writer.level = info
+
+level@jadx = error