From 758dcb748d9eb587e33c2533c33816b008ac2c67 Mon Sep 17 00:00:00 2001
From: Liyan Zhao <return65535@qq.com>
Date: Thu, 28 Nov 2024 18:40:39 +0800
Subject: [PATCH] fix: ignore some very very old kotlin classes to prevent them
 breaking remapping process (#1210)

* fix: ignore some very very old kotlin classes to prevent them breaking remapping process. Why? https://github.com/JetBrains/kotlin/blob/7c539b01f522d7ad458a3c774879277eccf03ffd/libraries/kotlinx-metadata/jvm/src/kotlin/metadata/jvm/KotlinClassMetadata.kt#L427

* fix: review suggestions
---
 .../KotlinClassMetadataRemappingAnnotationVisitor.kt      | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/main/kotlin/net/fabricmc/loom/kotlin/remapping/KotlinClassMetadataRemappingAnnotationVisitor.kt b/src/main/kotlin/net/fabricmc/loom/kotlin/remapping/KotlinClassMetadataRemappingAnnotationVisitor.kt
index b0736b7c7..f20054c4d 100644
--- a/src/main/kotlin/net/fabricmc/loom/kotlin/remapping/KotlinClassMetadataRemappingAnnotationVisitor.kt
+++ b/src/main/kotlin/net/fabricmc/loom/kotlin/remapping/KotlinClassMetadataRemappingAnnotationVisitor.kt
@@ -62,8 +62,14 @@ class KotlinClassMetadataRemappingAnnotationVisitor(
                     "is using (${KotlinVersion.CURRENT}).",
             )
         }
+        val metadata = KotlinClassMetadata.readLenient(header)
+        if (metadata.version.major < 1 || (metadata.version.major == 1 && metadata.version.minor < 4)) {
+            logger.warn("$className is not supported by kotlin metadata remapping (version: ${metadata.version})")
+            accept(next)
+            return
+        }
 
-        when (val metadata = KotlinClassMetadata.readLenient(header)) {
+        when (metadata) {
             is KotlinClassMetadata.Class -> {
                 var klass = metadata.kmClass
                 klass = KotlinClassRemapper(remapper).remap(klass)