Data-driven addition of enum constants (#148)

loader/src/main/java/net/neoforged/fml/common/asm/ListGeneratorAdapter.java

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) NeoForged and contributors
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+package net.neoforged.fml.common.asm;
+
+import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.commons.GeneratorAdapter;
+import org.objectweb.asm.tree.InsnList;
+import org.objectweb.asm.tree.MethodNode;
+
+public class ListGeneratorAdapter extends GeneratorAdapter {
+    public final InsnList insnList;
+
+    public ListGeneratorAdapter(InsnList insnList) {
+        super(Opcodes.ASM9, null, 0, "", "()V");
+        this.insnList = insnList;
+        MethodNode method = new MethodNode();
+        method.instructions = insnList;
+        mv = method;
+    }
+}

loader/src/main/java/net/neoforged/fml/common/asm/enumextension/EnumParameters.java

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) NeoForged and contributors
+ * SPDX-License-Identifier: LGPL-2.1-only
+ */
+
+package net.neoforged.fml.common.asm.enumextension;
+
+import java.util.List;
+import org.objectweb.asm.Type;
+
+sealed interface EnumParameters {
+    record Constant(List<Object> params) implements EnumParameters {}
+
+    record FieldReference(Type owner, String fieldName) implements EnumParameters {}
+
+    record MethodReference(Type owner, String methodName) implements EnumParameters {}
+}