vim-patch:8.2.0061: the execute stack can grow big and never shrinks

Problem:    The execute stack can grow big and never shrinks.
Solution:   Reduce the size in gargage collect.
https://github.com/vim/vim/commit/3fbcc128cbd2311819cc5a7bb89e45669860f008

1 files changed, 17 insertions, 0 deletions

diff --git a/src/nvim/eval.c b/src/nvim/eval.c
index f0b76b9a10..ff94cf5944 100644
--- a/src/nvim/eval.c
+++ b/src/nvim/eval.c
@@ -4188,6 +4188,23 @@ bool garbage_collect(bool testing)
     garbage_collect_at_exit = false;
   }
 
+  // The execution stack can grow big, limit the size.
+  if (exestack.ga_maxlen - exestack.ga_len > 500) {
+    // Keep 150% of the current size, with a minimum of the growth size.
+    int n = exestack.ga_len / 2;
+    if (n < exestack.ga_growsize) {
+      n = exestack.ga_growsize;
+    }
+
+    // Don't make it bigger though.
+    if (exestack.ga_len + n < exestack.ga_maxlen) {
+      size_t new_len = (size_t)exestack.ga_itemsize * (size_t)(exestack.ga_len + n);
+      char *pp = xrealloc(exestack.ga_data, new_len);
+      exestack.ga_maxlen = exestack.ga_len + n;
+      exestack.ga_data = pp;
+    }
+  }
+
   // We advance by two (COPYID_INC) because we add one for items referenced
   // through previous_funccal.
   const int copyID = get_copyID();