Check for buffer liveness when accessing tree-sitter node (bug#71012)

* src/treesit.h (treesit_node_buffer_live_p): Declare function.
* src/print.c (print_vectorlike): Print node without position if
buffer is killed.
* src/treesit.c (treesit_node_buffer_live_p): New function.
(treesit_check_node): Add buffer liveness check.
(syms_of_treesit): New error treesit-node-buffer-killed.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/print.c b/src/print.c
index d52d98ad371..8ee5a3616eb 100644
--- a/src/print.c
+++ b/src/print.c
@@ -2029,6 +2029,11 @@ print_vectorlike (Lisp_Object obj, Lisp_Object printcharfun, bool escapeflag,
           print_c_string ("-outdated>", printcharfun);
           break;
         }
+      if (!treesit_node_buffer_live_p (obj))
+        {
+          print_c_string ("-in-killed-buffer>", printcharfun);
+          break;
+        }
       printchar (' ', printcharfun);
       /* Now the node must be up-to-date, and calling functions like
          Ftreesit_node_start will not signal.  */