From 854144c5359648a66e11f74229b3aaf75c12cd5d Mon Sep 17 00:00:00 2001
From: Maxime Coste <mawww@kakoune.org>
Date: Wed, 4 Oct 2017 22:31:15 +0800
Subject: [PATCH] Regex: Fix handling of Save instruction in ThreadedRegexVM

When not saving, we were not fully reading the instruction stream,
leading to an out of sync instruction pointer.
---
 src/regex_impl.hh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/regex_impl.hh b/src/regex_impl.hh
index 67d6f38b..f6f79baf 100644
--- a/src/regex_impl.hh
+++ b/src/regex_impl.hh
@@ -171,6 +171,7 @@ struct ThreadedRegexVM
                 }
                 case CompiledRegex::Save:
                 {
+                    const size_t index = *thread.inst++;
                     if (thread.saves == nullptr)
                         break;
                     if (thread.saves->refcount > 1)
@@ -178,7 +179,6 @@ struct ThreadedRegexVM
                         --thread.saves->refcount;
                         thread.saves = new_saves<true>(thread.saves->pos);
                     }
-                    const size_t index = *thread.inst++;
                     thread.saves->pos[index] = pos.base();
                     break;
                 }