From acbbfafa07922b458506b91a58f3a082da453fd1 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@lukeshu.com>
Date: Sat, 11 Feb 2023 22:33:44 -0700
Subject: Try to avoid unnecessary allocations in enum-types' String methods

---
 lib/btrfs/Makefile | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

(limited to 'lib/btrfs/Makefile')

diff --git a/lib/btrfs/Makefile b/lib/btrfs/Makefile
index 015c3e1..b98a1b7 100644
--- a/lib/btrfs/Makefile
+++ b/lib/btrfs/Makefile
@@ -80,13 +80,10 @@ btrfsprim/itemtype.go: btrfsitem/items.txt $(MAKEFILE_LIST)
 	  sed -E 's,(.*)=([^:]*)(:.*)? (trivial|complex) (.*),\1_KEY ItemType=\2,' $< | uniq; \
 	  echo ')'; \
 	  echo 'func (t ItemType) String() string {'; \
-	  echo '  names := map[ItemType]string{'; \
-	  sed -E 's@(.*)=(.*) (trivial|complex) (.*)@\1_KEY: "\1",@' $< | sed 's/"UUID_/&KEY_/'; \
+	  echo '  switch t {'; \
+	  sed -E 's@(.*)=(.*) (trivial|complex) (.*)@case \1_KEY: return "\1"@' $< | sed 's/"UUID_/&KEY_/'; \
+	  echo '  default: return fmt.Sprintf("%d", t)'; \
 	  echo '  }'; \
-	  echo '  if name, ok := names[t]; ok {'; \
-	  echo '    return name'; \
-	  echo '  }'; \
-	  echo '  return fmt.Sprintf("%d", t)'; \
 	  echo '}'; \
 	} | gofmt >$@
 files += btrfsprim/itemtype.go
-- 
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