Rewrite GenSources including full support for CFR. (#511)

* Rewrite CFR decompiler interface. Support javadoc

* CFR line numbers and fixes.

* Cleanup and fix

* Use WorkerExecutor to fork, massively cleans up the fernflower code, but does remove the fancy multithreaded logging.

* Use IPC to get logging back from the decompilers.

* Cleanup UnpickJarTask, fix leak in IPCServer

* Used published CFR build

* Handle older windows versions that do not support AF_UNIX.

* Fixes and basic unit test

* Improve memory handling of genSources

* Stop decompile worker JVM

6 files changed, 76 insertions, 494 deletions

diff --git a/src/main/java/net/fabricmc/loom/decompilers/fernflower/AbstractFernFlowerDecompiler.java b/src/main/java/net/fabricmc/loom/decompilers/fernflower/AbstractFernFlowerDecompiler.java
deleted file mode 100644
index f059ed36..00000000
--- a/src/main/java/net/fabricmc/loom/decompilers/fernflower/AbstractFernFlowerDecompiler.java
+++ /dev/null
@@ -1,163 +0,0 @@
-/*
- * This file is part of fabric-loom, licensed under the MIT License (MIT).
- *
- * Copyright (c) 2019-2021 FabricMC
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-package net.fabricmc.loom.decompilers.fernflower;
-
-import static java.text.MessageFormat.format;
-
-import java.nio.file.Path;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Stack;
-import java.util.function.Supplier;
-
-import org.gradle.api.Project;
-import org.gradle.api.internal.project.ProjectInternal;
-import org.gradle.api.logging.LogLevel;
-import org.gradle.internal.logging.progress.ProgressLogger;
-import org.gradle.internal.logging.progress.ProgressLoggerFactory;
-import org.gradle.internal.service.ServiceRegistry;
-import org.gradle.process.ExecResult;
-import org.jetbrains.java.decompiler.main.extern.IFernflowerPreferences;
-
-import net.fabricmc.loom.api.decompilers.DecompilationMetadata;
-import net.fabricmc.loom.api.decompilers.LoomDecompiler;
-import net.fabricmc.loom.util.ConsumingOutputStream;
-import net.fabricmc.loom.util.OperatingSystem;
-
-public abstract class AbstractFernFlowerDecompiler implements LoomDecompiler {
-	private final Project project;
-
-	protected AbstractFernFlowerDecompiler(Project project) {
-		this.project = project;
-	}
-
-	public abstract Class<? extends AbstractForkedFFExecutor> fernFlowerExecutor();
-
-	@Override
-	public void decompile(Path compiledJar, Path sourcesDestination, Path linemapDestination, DecompilationMetadata metaData) {
-		if (!OperatingSystem.is64Bit()) {
-			throw new UnsupportedOperationException("FernFlower decompiler requires a 64bit JVM to run due to the memory requirements");
-		}
-
-		project.getLogging().captureStandardOutput(LogLevel.LIFECYCLE);
-
-		Map<String, Object> options = new HashMap<>() {{
-				put(IFernflowerPreferences.DECOMPILE_GENERIC_SIGNATURES, "1");
-				put(IFernflowerPreferences.BYTECODE_SOURCE_MAPPING, "1");
-				put(IFernflowerPreferences.REMOVE_SYNTHETIC, "1");
-				put(IFernflowerPreferences.LOG_LEVEL, "trace");
-				put(IFernflowerPreferences.THREADS, metaData.numberOfThreads());
-				put(IFernflowerPreferences.INDENT_STRING, "\t");
-			}};
-
-		List<String> args = new ArrayList<>();
-
-		options.forEach((k, v) -> args.add(format("-{0}={1}", k, v)));
-		args.add(absolutePathOf(compiledJar));
-		args.add("-o=" + absolutePathOf(sourcesDestination));
-		args.add("-l=" + absolutePathOf(linemapDestination));
-		args.add("-m=" + absolutePathOf(metaData.javaDocs()));
-
-		// TODO, Decompiler breaks on jemalloc, J9 module-info.class?
-		for (Path library : metaData.libraries()) {
-			args.add("-e=" + absolutePathOf(library));
-		}
-
-		ServiceRegistry registry = ((ProjectInternal) project).getServices();
-		ProgressLoggerFactory factory = registry.get(ProgressLoggerFactory.class);
-		ProgressLogger progressGroup = factory.newOperation(getClass()).setDescription("Decompile");
-		Supplier<ProgressLogger> loggerFactory = () -> {
-			ProgressLogger pl = factory.newOperation(getClass(), progressGroup);
-			pl.setDescription("decompile worker");
-			pl.started();
-			return pl;
-		};
-		Stack<ProgressLogger> freeLoggers = new Stack<>();
-		Map<String, ProgressLogger> inUseLoggers = new HashMap<>();
-
-		progressGroup.started();
-		ExecResult result = ForkingJavaExec.javaexec(
-				project,
-				spec -> {
-					spec.getMainClass().set(fernFlowerExecutor().getName());
-					spec.jvmArgs("-Xms200m", "-Xmx3G");
-					spec.setArgs(args);
-					spec.setErrorOutput(new ConsumingOutputStream(line -> {
-						if (line.startsWith("Inconsistent inner class entries")) {
-							// Suppress this
-							return;
-						}
-
-						System.err.println(line);
-					}));
-					spec.setStandardOutput(new ConsumingOutputStream(line -> {
-						if (line.startsWith("Listening for transport") || !line.contains("::")) {
-							System.out.println(line);
-							return;
-						}
-
-						int sepIdx = line.indexOf("::");
-						String id = line.substring(0, sepIdx).trim();
-						String data = line.substring(sepIdx + 2).trim();
-
-						ProgressLogger logger = inUseLoggers.get(id);
-
-						String[] segs = data.split(" ");
-
-						if (segs[0].equals("waiting")) {
-							if (logger != null) {
-								logger.progress("Idle..");
-								inUseLoggers.remove(id);
-								freeLoggers.push(logger);
-							}
-						} else {
-							if (logger == null) {
-								if (!freeLoggers.isEmpty()) {
-									logger = freeLoggers.pop();
-								} else {
-									logger = loggerFactory.get();
-								}
-
-								inUseLoggers.put(id, logger);
-							}
-
-							logger.progress(data);
-						}
-					}));
-				});
-		inUseLoggers.values().forEach(ProgressLogger::completed);
-		freeLoggers.forEach(ProgressLogger::completed);
-		progressGroup.completed();
-
-		result.rethrowFailure();
-		result.assertNormalExitValue();
-	}
-
-	private static String absolutePathOf(Path path) {
-		return path.toAbsolutePath().toString();
-	}
-}
diff --git a/src/main/java/net/fabricmc/loom/decompilers/fernflower/AbstractForkedFFExecutor.java b/src/main/java/net/fabricmc/loom/decompilers/fernflower/AbstractForkedFFExecutor.java
deleted file mode 100644
index 2435233e..00000000
--- a/src/main/java/net/fabricmc/loom/decompilers/fernflower/AbstractForkedFFExecutor.java
+++ /dev/null
@@ -1,107 +0,0 @@
-/*
- * This file is part of fabric-loom, licensed under the MIT License (MIT).
- *
- * Copyright (c) 2019-2020 FabricMC
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-package net.fabricmc.loom.decompilers.fernflower;
-
-import java.io.File;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Objects;
-
-/**
- * Entry point for Forked FernFlower task.
- * Takes one parameter, a single file, each line is treated as command line input.
- * Forces one input file.
- * Forces one output file using '-o=/path/to/output'
- * Created by covers1624 on 11/02/19.
- * <p>Extending classes MUST have a standard "public static void main(args)".
- * They may then call AbstractForkedFFExecutor#decompile for it to use the overridden AbstractForkedFFExecutor#runFF
- * </p>
- */
-public abstract class AbstractForkedFFExecutor {
-	public static void decompile(String[] args, AbstractForkedFFExecutor ffExecutor) {
-		Map<String, Object> options = new HashMap<>();
-		File input = null;
-		File output = null;
-		File lineMap = null;
-		File mappings = null;
-		List<File> libraries = new ArrayList<>();
-
-		boolean isOption = true;
-
-		for (String arg : args) {
-			if (isOption && arg.length() > 5 && arg.charAt(0) == '-' && arg.charAt(4) == '=') {
-				String value = arg.substring(5);
-
-				if ("true".equalsIgnoreCase(value)) {
-					value = "1";
-				} else if ("false".equalsIgnoreCase(value)) {
-					value = "0";
-				}
-
-				options.put(arg.substring(1, 4), value);
-			} else {
-				isOption = false;
-
-				if (arg.startsWith("-e=")) {
-					libraries.add(new File(arg.substring(3)));
-				} else if (arg.startsWith("-o=")) {
-					if (output != null) {
-						throw new RuntimeException("Unable to set more than one output.");
-					}
-
-					output = new File(arg.substring(3));
-				} else if (arg.startsWith("-l=")) {
-					if (lineMap != null) {
-						throw new RuntimeException("Unable to set more than one lineMap file.");
-					}
-
-					lineMap = new File(arg.substring(3));
-				} else if (arg.startsWith("-m=")) {
-					if (mappings != null) {
-						throw new RuntimeException("Unable to use more than one mappings file.");
-					}
-
-					mappings = new File(arg.substring(3));
-				} else {
-					if (input != null) {
-						throw new RuntimeException("Unable to set more than one input.");
-					}
-
-					input = new File(arg);
-				}
-			}
-		}
-
-		Objects.requireNonNull(input, "Input not set.");
-		Objects.requireNonNull(output, "Output not set.");
-		Objects.requireNonNull(mappings, "Mappings not set.");
-
-		ffExecutor.runFF(options, libraries, input, output, lineMap, mappings);
-	}
-
-	public abstract void runFF(Map<String, Object> options, List<File> libraries, File input, File output, File lineMap, File mappings);
-}
diff --git a/src/main/java/net/fabricmc/loom/decompilers/fernflower/FabricFernFlowerDecompiler.java b/src/main/java/net/fabricmc/loom/decompilers/fernflower/FabricFernFlowerDecompiler.java
index b3663773..c3009448 100644
--- a/src/main/java/net/fabricmc/loom/decompilers/fernflower/FabricFernFlowerDecompiler.java
+++ b/src/main/java/net/fabricmc/loom/decompilers/fernflower/FabricFernFlowerDecompiler.java
@@ -1,7 +1,7 @@
 /*
  * This file is part of fabric-loom, licensed under the MIT License (MIT).
  *
- * Copyright (c) 2018-2020 FabricMC
+ * Copyright (c) 2019-2021 FabricMC
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -24,20 +24,43 @@
 
 package net.fabricmc.loom.decompilers.fernflower;
 
-import org.gradle.api.Project;
+import java.nio.file.Path;
+import java.util.Map;
 
-public class FabricFernFlowerDecompiler extends AbstractFernFlowerDecompiler {
-	public FabricFernFlowerDecompiler(Project project) {
-		super(project);
-	}
+import org.jetbrains.java.decompiler.main.Fernflower;
+import org.jetbrains.java.decompiler.main.extern.IFernflowerPreferences;
+import org.jetbrains.java.decompiler.main.extern.IResultSaver;
+
+import net.fabricmc.fernflower.api.IFabricJavadocProvider;
+import net.fabricmc.loom.api.decompilers.DecompilationMetadata;
+import net.fabricmc.loom.api.decompilers.LoomDecompiler;
 
+public final class FabricFernFlowerDecompiler implements LoomDecompiler {
 	@Override
 	public String name() {
 		return "FabricFlower"; // Or something else?
 	}
 
 	@Override
-	public Class<? extends AbstractForkedFFExecutor> fernFlowerExecutor() {
-		return FabricForkedFFExecutor.class;
+	public void decompile(Path compiledJar, Path sourcesDestination, Path linemapDestination, DecompilationMetadata metaData) {
+		Map<String, Object> options = Map.of(
+				IFernflowerPreferences.DECOMPILE_GENERIC_SIGNATURES, "1",
+				IFernflowerPreferences.BYTECODE_SOURCE_MAPPING, "1",
+				IFernflowerPreferences.REMOVE_SYNTHETIC, "1",
+				IFernflowerPreferences.LOG_LEVEL, "trace",
+				IFernflowerPreferences.THREADS, String.valueOf(metaData.numberOfThreads()),
+				IFernflowerPreferences.INDENT_STRING, "\t",
+				IFabricJavadocProvider.PROPERTY_NAME, new TinyJavadocProvider(metaData.javaDocs().toFile())
+		);
+
+		IResultSaver saver = new ThreadSafeResultSaver(sourcesDestination::toFile, linemapDestination::toFile);
+		Fernflower ff = new Fernflower(FernFlowerUtils::getBytecode, saver, options, new FernflowerLogger(metaData.logger()));
+
+		for (Path library : metaData.libraries()) {
+			ff.addLibrary(library.toFile());
+		}
+
+		ff.addSource(compiledJar.toFile());
+		ff.decompileContext();
 	}
 }
diff --git a/src/main/java/net/fabricmc/loom/decompilers/fernflower/FabricForkedFFExecutor.java b/src/main/java/net/fabricmc/loom/decompilers/fernflower/FernflowerLogger.java
index e88c8086..a98060e9 100644
--- a/src/main/java/net/fabricmc/loom/decompilers/fernflower/FabricForkedFFExecutor.java
+++ b/src/main/java/net/fabricmc/loom/decompilers/fernflower/FernflowerLogger.java
@@ -1,7 +1,7 @@
 /*
  * This file is part of fabric-loom, licensed under the MIT License (MIT).
  *
- * Copyright (c) 2018-2020 FabricMC
+ * Copyright (c) 2021 FabricMC
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -24,34 +24,60 @@
 
 package net.fabricmc.loom.decompilers.fernflower;
 
-import java.io.File;
-import java.util.List;
-import java.util.Map;
+import java.io.IOException;
 
-import org.jetbrains.java.decompiler.main.Fernflower;
 import org.jetbrains.java.decompiler.main.extern.IFernflowerLogger;
-import org.jetbrains.java.decompiler.main.extern.IResultSaver;
 
-import net.fabricmc.fernflower.api.IFabricJavadocProvider;
+import net.fabricmc.loom.util.IOStringConsumer;
 
-public class FabricForkedFFExecutor extends AbstractForkedFFExecutor {
-	public static void main(String[] args) {
-		AbstractForkedFFExecutor.decompile(args, new FabricForkedFFExecutor());
+public class FernflowerLogger extends IFernflowerLogger {
+	private final IOStringConsumer logger;
+
+	public FernflowerLogger(IOStringConsumer logger) {
+		this.logger = logger;
 	}
 
 	@Override
-	public void runFF(Map<String, Object> options, List<File> libraries, File input, File output, File lineMap, File mappings) {
-		options.put(IFabricJavadocProvider.PROPERTY_NAME, new TinyJavadocProvider(mappings));
+	public void writeMessage(String message, Severity severity) {
+		if (message.contains("Inconsistent inner class entries for")) return;
+		System.err.println(message);
+	}
 
-		IResultSaver saver = new ThreadSafeResultSaver(() -> output, () -> lineMap);
-		IFernflowerLogger logger = new ThreadIDFFLogger();
-		Fernflower ff = new Fernflower(FernFlowerUtils::getBytecode, saver, options, logger);
+	@Override
+	public void writeMessage(String message, Severity severity, Throwable t) {
+		writeMessage(message, severity);
+	}
 
-		for (File library : libraries) {
-			ff.addLibrary(library);
+	private void write(String data) {
+		try {
+			logger.accept(data);
+		} catch (IOException e) {
+			throw new RuntimeException("Failed to log", e);
 		}
+	}
+
+	@Override
+	public void startReadingClass(String className) {
+		write("Decompiling " + className);
+	}
+
+	@Override
+	public void startClass(String className) {
+		write("Decompiling " + className);
+	}
+
+	@Override
+	public void startWriteClass(String className) {
+		// Nope
+	}
 
-		ff.addSource(input);
-		ff.decompileContext();
+	@Override
+	public void startMethod(String methodName) {
+		// Nope
+	}
+
+	@Override
+	public void endMethod() {
+		// Nope
 	}
 }
diff --git a/src/main/java/net/fabricmc/loom/decompilers/fernflower/ForkingJavaExec.java b/src/main/java/net/fabricmc/loom/decompilers/fernflower/ForkingJavaExec.java
deleted file mode 100644
index bbcd80de..00000000
--- a/src/main/java/net/fabricmc/loom/decompilers/fernflower/ForkingJavaExec.java
+++ /dev/null
@@ -1,70 +0,0 @@
-/*
- * This file is part of fabric-loom, licensed under the MIT License (MIT).
- *
- * Copyright (c) 2016-2021 FabricMC
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-package net.fabricmc.loom.decompilers.fernflower;
-
-import java.net.URL;
-import java.net.URLClassLoader;
-
-import org.gradle.api.Action;
-import org.gradle.api.Project;
-import org.gradle.api.artifacts.ConfigurationContainer;
-import org.gradle.api.artifacts.dsl.DependencyHandler;
-import org.gradle.api.file.FileCollection;
-import org.gradle.process.ExecResult;
-import org.gradle.process.JavaExecSpec;
-
-/**
- * Simple utility class for a Task that wishes to execute a java process
- * with the classpath of the gradle plugin plus groovy.
- *
- * <p>Created by covers1624 on 11/02/19.
- */
-public class ForkingJavaExec {
-	public static ExecResult javaexec(Project project, Action<? super JavaExecSpec> action) {
-		return project.javaexec(spec -> {
-			spec.classpath(getClasspath(project));
-			action.execute(spec);
-		});
-	}
-
-	private static Object getClasspath(Project project) {
-		if (System.getProperty("fabric.loom.test") != null) {
-			return getTestClasspath();
-		}
-
-		return getRuntimeClasspath(project.getRootProject().getPlugins().hasPlugin("fabric-loom") ? project.getRootProject() : project);
-	}
-
-	private static FileCollection getRuntimeClasspath(Project project) {
-		ConfigurationContainer configurations = project.getBuildscript().getConfigurations();
-		DependencyHandler handler = project.getDependencies();
-		return configurations.getByName("classpath")
-				.plus(configurations.detachedConfiguration(handler.localGroovy()));
-	}
-
-	private static URL[] getTestClasspath() {
-		return ((URLClassLoader) ForkingJavaExec.class.getClassLoader()).getURLs();
-	}
-}
diff --git a/src/main/java/net/fabricmc/loom/decompilers/fernflower/ThreadIDFFLogger.java b/src/main/java/net/fabricmc/loom/decompilers/fernflower/ThreadIDFFLogger.java
deleted file mode 100644
index a7b617bc..00000000
--- a/src/main/java/net/fabricmc/loom/decompilers/fernflower/ThreadIDFFLogger.java
+++ /dev/null
@@ -1,127 +0,0 @@
-/*
- * This file is part of fabric-loom, licensed under the MIT License (MIT).
- *
- * Copyright (c) 2019-2020 FabricMC
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-package net.fabricmc.loom.decompilers.fernflower;
-
-import java.io.PrintStream;
-import java.text.MessageFormat;
-import java.util.Stack;
-
-import org.jetbrains.java.decompiler.main.extern.IFernflowerLogger;
-
-/**
- * This logger simply prints what each thread is doing
- * to the console in a machine parsable way.
- *
- * <p>Created by covers1624 on 11/02/19.
- */
-public class ThreadIDFFLogger extends IFernflowerLogger {
-	public final PrintStream stdOut;
-	public final PrintStream stdErr;
-
-	private final ThreadLocal<Stack<String>> workingClass = ThreadLocal.withInitial(Stack::new);
-	private final ThreadLocal<Stack<String>> line = ThreadLocal.withInitial(Stack::new);
-
-	public ThreadIDFFLogger() {
-		this(System.err, System.out);
-	}
-
-	public ThreadIDFFLogger(PrintStream stdOut, PrintStream stdErr) {
-		this.stdOut = stdOut;
-		this.stdErr = stdErr;
-	}
-
-	@Override
-	public void writeMessage(String message, Severity severity) {
-		System.err.println(message);
-	}
-
-	@Override
-	public void writeMessage(String message, Severity severity, Throwable t) {
-		System.err.println(message);
-		t.printStackTrace(System.err);
-	}
-
-	private void print() {
-		Thread thread = Thread.currentThread();
-		long id = thread.getId();
-
-		if (line.get().isEmpty()) {
-			System.out.println(MessageFormat.format("{0} :: waiting", id));
-			return;
-		}
-
-		String line = this.line.get().peek();
-		System.out.println(MessageFormat.format("{0} :: {1}", id, line).trim());
-	}
-
-	@Override
-	public void startReadingClass(String className) {
-		workingClass.get().push(className);
-		line.get().push("Decompiling " + className);
-		print();
-	}
-
-	@Override
-	public void startClass(String className) {
-		workingClass.get().push(className);
-		line.get().push("Decompiling " + className);
-		print();
-	}
-
-	@Override
-	public void startMethod(String methodName) {
-		// No need to print out methods
-	}
-
-	@Override
-	public void endMethod() {
-	}
-
-	@Override
-	public void endClass() {
-		line.get().pop();
-		workingClass.get().pop();
-		print();
-	}
-
-	@Override
-	public void startWriteClass(String className) {
-		line.get().push("Writing " + className);
-		print();
-	}
-
-	@Override
-	public void endWriteClass() {
-		line.get().pop();
-		print();
-	}
-
-	@Override
-	public void endReadingClass() {
-		line.get().pop();
-		workingClass.get().pop();
-		print();
-	}
-}