Mixin changes

LICENSE-header.txt

@@ -1,2 +1,2 @@
-Copyright (c) Forge Development LLC and contributors
-SPDX-License-Identifier: LGPL-2.1-only
+Copyright (c) NeoForged and contributors
+SPDX-License-Identifier: LGPL-2.1-only

build.gradle

@@ -1,7 +1,7 @@
 plugins {
     id 'com.github.ben-manes.versions' version '0.39.0'
     id 'org.javamodularity.moduleplugin' version '1.8.7'
-    id 'org.cadixdev.licenser' version '0.6.0'
+    id 'net.neoforged.licenser' version '0.7.2' apply false
     id 'net.neoforged.gradleutils' version '[2.0.18,3)'
 }
 
@@ -17,7 +17,7 @@ allprojects {
 
     apply plugin: 'com.github.ben-manes.versions'
     apply plugin: 'org.javamodularity.moduleplugin'
-    apply plugin: 'org.cadixdev.licenser'
+    apply plugin: 'net.neoforged.licenser'
     apply plugin: 'net.neoforged.gradleutils'
 
     group = 'net.neoforged.fancymodloader'
@@ -84,6 +84,7 @@ subprojects { subProject ->
 
     license {
         header = rootProject.file('LICENSE-header.txt')
+        skipExistingHeaders true
 
         include 'net/neoforged/'
     }
@@ -117,4 +118,4 @@ subprojects { subProject ->
     changelog {
         fromTag "1.0"
     }
-}
+}

gradle.properties

@@ -7,6 +7,7 @@ modlauncher_version=10.0.9
 securejarhandler_version=2.1.10
 bootstraplauncher_version=1.1.2
 asm_version=9.5
+mixin_version=0.8.5
 terminalconsoleappender_version=1.2.0
 nightconfig_version=3.6.4
 jetbrains_annotations_version=24.0.1
@@ -23,4 +24,4 @@ guava_version=31.1-jre
 gson_version=2.10
 apache_commons_lang3_version=3.12.0
 jopt_simple_version=5.0.4
-commons_io_version=2.11.0
+commons_io_version=2.11.0

loader/build.gradle

@@ -23,6 +23,7 @@ dependencies {
     implementation("net.sf.jopt-simple:jopt-simple:${jopt_simple_version}")
     implementation("cpw.mods:securejarhandler:${securejarhandler_version}")
     implementation("net.neoforged:accesstransformers:${accesstransformers_version}")
+    implementation("org.spongepowered:mixin:${mixin_version}")
     implementation("net.minecrell:terminalconsoleappender:${terminalconsoleappender_version}")
 
     implementation("org.apache.logging.log4j:log4j-core:${log4j_version}")

loader/src/main/java/net/neoforged/fml/loading/FMLLoader.java

@@ -8,8 +8,8 @@
 import com.mojang.logging.LogUtils;
 import cpw.mods.modlauncher.Launcher;
 import cpw.mods.modlauncher.api.*;
-import cpw.mods.modlauncher.serviceapi.ILaunchPluginService;
 import cpw.mods.modlauncher.util.ServiceLoaderUtils;
+import net.neoforged.fml.loading.mixin.DeferredMixinConfigRegistration;
 import net.neoforged.fml.loading.moddiscovery.BackgroundScanHandler;
 import net.neoforged.fml.loading.moddiscovery.ModDiscoverer;
 import net.neoforged.fml.loading.moddiscovery.ModFile;
@@ -157,11 +157,15 @@ public static List<ITransformationService.Resource> beginModScan(final Map<Strin
         return List.of(pluginResources);
     }
 
-    public static List<ITransformationService.Resource> completeScan(IModuleLayerManager layerManager) {
+    public static List<ITransformationService.Resource> completeScan(IModuleLayerManager layerManager, List<String> extraMixinConfigs) {
         moduleLayerManager = layerManager;
         languageLoadingProvider = new LanguageLoadingProvider();
         backgroundScanHandler = modValidator.stage2Validation();
         loadingModList = backgroundScanHandler.getLoadingModList();
+        if (loadingModList.getErrors().isEmpty()) {
+            // Add extra mixin configs
+            extraMixinConfigs.forEach(DeferredMixinConfigRegistration::addMixinConfig);
+        }
         return List.of(modValidator.getModResources());
     }
 

loader/src/main/java/net/neoforged/fml/loading/FMLServiceProvider.java

@@ -30,6 +30,7 @@ public class FMLServiceProvider implements ITransformationService
     private ArgumentAcceptingOptionSpec<String> modsOption;
     private ArgumentAcceptingOptionSpec<String> modListsOption;
     private ArgumentAcceptingOptionSpec<String> mavenRootsOption;
+    private ArgumentAcceptingOptionSpec<String> mixinConfigsOption;
     private ArgumentAcceptingOptionSpec<String> fmlOption;
     private ArgumentAcceptingOptionSpec<String> forgeOption;
     private ArgumentAcceptingOptionSpec<String> mcOption;
@@ -38,6 +39,7 @@ public class FMLServiceProvider implements ITransformationService
     private List<String> modsArgumentList;
     private List<String> modListsArgumentList;
     private List<String> mavenRootsArgumentList;
+    private List<String> mixinConfigsArgumentList;
     private String targetForgeVersion;
     private String targetFMLVersion;
     private String targetMcVersion;
@@ -88,7 +90,7 @@ public List<Resource> beginScanning(final IEnvironment environment) {
 
     @Override
     public List<Resource> completeScan(final IModuleLayerManager layerManager) {
-        return FMLLoader.completeScan(layerManager);
+        return FMLLoader.completeScan(layerManager, mixinConfigsArgumentList);
     }
 
     @Override
@@ -111,6 +113,7 @@ public void arguments(BiFunction<String, String, OptionSpecBuilder> argumentBuil
         modsOption = argumentBuilder.apply("mods", "List of mods to add").withRequiredArg().ofType(String.class).withValuesSeparatedBy(",");
         modListsOption = argumentBuilder.apply("modLists", "JSON modlists").withRequiredArg().ofType(String.class).withValuesSeparatedBy(",");
         mavenRootsOption = argumentBuilder.apply("mavenRoots", "Maven root directories").withRequiredArg().ofType(String.class).withValuesSeparatedBy(",");
+        mixinConfigsOption = argumentBuilder.apply("mixinConfig", "Additional mixin config files to load").withRequiredArg().ofType(String.class);
     }
 
     @Override
@@ -119,6 +122,7 @@ public void argumentValues(OptionResult option)
         modsArgumentList = option.values(modsOption);
         modListsArgumentList = option.values(modListsOption);
         mavenRootsArgumentList = option.values(mavenRootsOption);
+        mixinConfigsArgumentList = option.values(mixinConfigsOption);
         targetFMLVersion = option.value(fmlOption);
         targetForgeVersion = option.value(forgeOption);
         targetMcVersion = option.value(mcOption);

loader/src/main/java/net/neoforged/fml/loading/LoadingModList.java

@@ -6,6 +6,7 @@
 package net.neoforged.fml.loading;
 
 import cpw.mods.modlauncher.api.LamdbaExceptionUtils;
+import net.neoforged.fml.loading.mixin.DeferredMixinConfigRegistration;
 import net.neoforged.fml.loading.moddiscovery.BackgroundScanHandler;
 import net.neoforged.fml.loading.moddiscovery.ModFile;
 import net.neoforged.fml.loading.moddiscovery.ModFileInfo;
@@ -76,6 +77,14 @@ public void addCoreMods()
                 .forEach(FMLLoader.getCoreModProvider()::addCoreMod);
     }
 
+    public void addMixinConfigs() {
+        modFiles.stream()
+                .map(ModFileInfo::getFile)
+                .map(ModFile::getMixinConfigs)
+                .flatMap(List::stream)
+                .forEach(DeferredMixinConfigRegistration::addMixinConfig);
+    }
+
     public void addAccessTransformers()
     {
         modFiles.stream()

loader/src/main/java/net/neoforged/fml/loading/mixin/DeferredMixinConfigRegistration.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) NeoForged and contributors
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+package net.neoforged.fml.loading.mixin;
+
+import org.spongepowered.asm.launch.GlobalProperties;
+import org.spongepowered.asm.launch.MixinBootstrap;
+import org.spongepowered.asm.mixin.Mixins;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class DeferredMixinConfigRegistration {
+    private static boolean added = false;
+    private static final List<String> mixinConfigs = new ArrayList<>();
+
+    static {
+        // Register our platform agent first
+        List<String> agentClassNames = GlobalProperties.get(GlobalProperties.Keys.AGENTS);
+        agentClassNames.add(FMLMixinPlatformAgent.class.getName());
+        // Register the container (will use the platform agent)
+        MixinBootstrap.getPlatform().addContainer(new FMLMixinContainerHandle());
+    }
+
+    public static void addMixinConfig(String config) {
+        if (added) {
+            throw new IllegalStateException("Too late to add mixin configs!");
+        }
+
+        mixinConfigs.add(config);
+    }
+
+    static void registerConfigs() {
+        added = true;
+        mixinConfigs.forEach(Mixins::addConfiguration);
+        mixinConfigs.clear();
+    }
+}

loader/src/main/java/net/neoforged/fml/loading/mixin/FMLMixinContainerHandle.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) NeoForged and contributors
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+package net.neoforged.fml.loading.mixin;
+
+import org.spongepowered.asm.launch.platform.container.IContainerHandle;
+
+import java.util.Collection;
+import java.util.List;
+
+/**
+ * Container handle representing all of FML's mixin configs.
+ * No attribute because we directly load the mixin configs in {@link FMLMixinPlatformAgent}.
+ */
+public class FMLMixinContainerHandle implements IContainerHandle {
+    @Override
+    public String getAttribute(String name) {
+        return null;
+    }
+
+    @Override
+    public Collection<IContainerHandle> getNestedContainers() {
+        return List.of();
+    }
+}

loader/src/main/java/net/neoforged/fml/loading/mixin/FMLMixinPlatformAgent.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) NeoForged and contributors
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+package net.neoforged.fml.loading.mixin;
+
+import org.spongepowered.asm.launch.platform.MixinPlatformAgentAbstract;
+import org.spongepowered.asm.launch.platform.MixinPlatformManager;
+import org.spongepowered.asm.launch.platform.container.IContainerHandle;
+
+public class FMLMixinPlatformAgent extends MixinPlatformAgentAbstract {
+    @Override
+    public AcceptResult accept(MixinPlatformManager manager, IContainerHandle handle) {
+        if (handle instanceof FMLMixinContainerHandle) {
+            return AcceptResult.ACCEPTED;
+        }
+        return AcceptResult.REJECTED;
+    }
+
+    @Override
+    public void prepare() {
+        // Load all the mixin configs!!
+        DeferredMixinConfigRegistration.registerConfigs();
+    }
+}

loader/src/main/java/net/neoforged/fml/loading/moddiscovery/BackgroundScanHandler.java

@@ -34,12 +34,10 @@ private enum ScanStatus {
     private final List<ModFile> pendingFiles;
     private final List<ModFile> scannedFiles;
     private final List<ModFile> allFiles;
-    private final List<ModFile> modFiles;
     private ScanStatus status;
     private LoadingModList loadingModList;
 
-    public BackgroundScanHandler(final List<ModFile> modFiles) {
-        this.modFiles = modFiles;
+    public BackgroundScanHandler() {
         modContentScanner = Executors.newSingleThreadExecutor(r -> {
             final Thread thread = Executors.defaultThreadFactory().newThread(r);
             thread.setDaemon(true);
@@ -52,10 +50,6 @@ public BackgroundScanHandler(final List<ModFile> modFiles) {
         status = ScanStatus.NOT_STARTED;
     }
 
-    public List<ModFile> getModFiles() {
-        return modFiles;
-    }
-
     public void submitForScanning(final ModFile file) {
         if (modContentScanner.isShutdown()) {
             status = ScanStatus.ERRORED;

loader/src/main/java/net/neoforged/fml/loading/moddiscovery/ModFile.java

@@ -58,6 +58,7 @@ public class ModFile implements IModFile {
     private ModFileScanData fileModFileScanData;
     private CompletableFuture<ModFileScanData> futureScanResult;
     private List<CoreModFile> coreMods;
+    private List<String> mixinConfigs;
     private Path accessTransformer;
 
     static final Attributes.Name TYPE = new Attributes.Name("FMLModType");
@@ -112,6 +113,8 @@ public boolean identifyMods() {
         LOGGER.debug(LogMarkers.LOADING,"Loading mod file {} with languages {}", this.getFilePath(), this.modFileInfo.requiredLanguageLoaders());
         this.coreMods = ModFileParser.getCoreMods(this);
         this.coreMods.forEach(mi-> LOGGER.debug(LogMarkers.LOADING,"Found coremod {}", mi.getPath()));
+        this.mixinConfigs = ModFileParser.getMixinConfigs(this.modFileInfo);
+        this.mixinConfigs.forEach(mc -> LOGGER.debug(LogMarkers.LOADING,"Found mixin config {}", mc));
         this.accessTransformer = findResource("META-INF", "accesstransformer.cfg");
         return true;
     }
@@ -120,6 +123,10 @@ public List<CoreModFile> getCoreMods() {
         return coreMods;
     }
 
+    public List<String> getMixinConfigs() {
+        return mixinConfigs;
+    }
+
     /**
      * Run in an executor thread to harvest the class and annotation list
      */

loader/src/main/java/net/neoforged/fml/loading/moddiscovery/ModFileParser.java

@@ -66,4 +66,21 @@ protected static List<CoreModFile> getCoreMods(final ModFile modFile) {
                 .map(e -> new CoreModFile(e.getKey(), modFile.findResource(e.getValue()),modFile))
                 .toList();
     }
+
+    protected static List<String> getMixinConfigs(IModFileInfo modFileInfo) {
+        try {
+            var config = modFileInfo.getConfig();
+            var mixinsEntries = config.getConfigList("mixins");
+            return mixinsEntries
+                    .stream()
+                    .map(entry -> entry
+                            .<String>getConfigElement("config")
+                            .orElseThrow(
+                                    () -> new InvalidModFileException("Missing \"config\" in [[mixins]] entry", modFileInfo)))
+                    .toList();
+        } catch (Exception exception) {
+            LOGGER.error("Failed to load mixin configs from mod file", exception);
+            return List.of();
+        }
+    }
 }

loader/src/main/java/net/neoforged/fml/loading/moddiscovery/ModValidator.java

@@ -19,6 +19,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 public class ModValidator {
     private static final Logger LOGGER = LogUtils.getLogger();
@@ -71,7 +72,12 @@ public ITransformationService.Resource getPluginResources() {
     }
 
     public ITransformationService.Resource getModResources() {
-        return new ITransformationService.Resource(IModuleLayerManager.Layer.GAME, this.candidateMods.stream().map(IModFile::getSecureJar).toList());
+        var modFilesToLoad = Stream.concat(
+                // mods
+                this.loadingModList.getModFiles().stream().map(ModFileInfo::getFile),
+                // game libraries
+                this.modFiles.get(IModFile.Type.GAMELIBRARY).stream());
+        return new ITransformationService.Resource(IModuleLayerManager.Layer.GAME, modFilesToLoad.map(ModFile::getSecureJar).toList());
     }
 
     private List<EarlyLoadingException.ExceptionData> validateLanguages() {
@@ -97,8 +103,9 @@ public BackgroundScanHandler stage2Validation() {
         loadingModList = ModSorter.sort(candidateMods, allErrors);
         loadingModList.addCoreMods();
         loadingModList.addAccessTransformers();
+        loadingModList.addMixinConfigs();
         loadingModList.setBrokenFiles(brokenFiles);
-        BackgroundScanHandler backgroundScanHandler = new BackgroundScanHandler(candidateMods);
+        BackgroundScanHandler backgroundScanHandler = new BackgroundScanHandler();
         loadingModList.addForScanning(backgroundScanHandler);
         return backgroundScanHandler;
     }