Subject: Re: bug#60522: make-vector takes 100% cpu if called without argument in the REPL
From: Ludovic Courtès <[email-masked]>
To: Sascha Ziemann <[email-masked]>
Cc: [email-masked]
Date: Mon, 16 Jan 2023 15:36:54 +0100
List-Id: <debbugs-submit.debbugs.gnu.org>

Hi,

Sascha Ziemann <[email-masked]> skribis:

> The following throws an error:
> guile -c '(make-vector)'
>
> But the evaluation of '(make-vector)' in the REPL generats just a warning:
>
> ;;; <stdin>:1:0: warning: possibly wrong number of arguments to `make-vector'
>
> and seems to enter an endless loop afterwards.

The guts of the problem is an endless loop while reducing primitives:

--8<---------------cut here---------------start------------->8---
scheme@(language tree-il primitives)> (make-call #f (make-primitive-ref #f 'make-vector) '())
$21 = #<tree-il (call (primitive make-vector))>
scheme@(language tree-il primitives)> (resolve-primitives $21 (current-module))
$22 = #<tree-il (primcall make-vector)>
scheme@(language tree-il primitives)> (expand-primcall $22)
$23 = #<tree-il (call (primitive make-vector))>
--8<---------------cut here---------------end--------------->8---

This is fixed in 51152392ef04b053e3c7b2576473df2df9d08fe0:

--8<---------------cut here---------------start------------->8---
scheme@(language tree-il primitives)> (expand-primcall $22)
$32 = #<tree-il (primcall make-vector)>
--8<---------------cut here---------------end--------------->8---

Thanks!

Ludo’.