From 8256d77c7fe551011cc744ddb204ca20c4eea175 Mon Sep 17 00:00:00 2001
From: Kazuho Oku <kazuhooku@gmail.com>
Date: Thu, 10 Sep 2015 22:50:01 +0900
Subject: avoid unnecessary string duplications by checking the frozen flag

---
 src/hash.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/hash.c b/src/hash.c
index 42b40482a..ffb8bd931 100644
--- a/src/hash.c
+++ b/src/hash.c
@@ -104,12 +104,11 @@ static void mrb_hash_modify(mrb_state *mrb, mrb_value hash);
 static inline mrb_value
 mrb_hash_ht_key(mrb_state *mrb, mrb_value key)
 {
-  if (mrb_string_p(key)) {
+  if (mrb_string_p(key) && !RSTR_FROZEN_P(mrb_str_ptr(key))) {
     key = mrb_str_dup(mrb, key);
     RSTR_SET_FROZEN_FLAG(mrb_str_ptr(key));
-    return key;
-  } else
-    return key;
+  }
+  return key;
 }
 
 #define KEY(key) mrb_hash_ht_key(mrb, key)
-- 
cgit v1.2.3