From: Takashi Yano <takashi.yano@nifty.ne.jp>
To: cygwin@cygwin.com
Subject: Re: stack grow direction wrongly detected
Date: Sat, 6 Mar 2021 10:06:57 +0900 [thread overview]
Message-ID: <20210306100657.135a86aacf935a7f9e9a7847@nifty.ne.jp> (raw)
In-Reply-To: <b9285d42-1400-dabf-83a5-2e244f1efe81@gmail.com>
On Fri, 5 Mar 2021 21:29:49 +0100
Marco Atzeri wrote:
> guile 1.8.8 is 10 years old, but it is still used by some programs
> as all the guile 2.x series were slower.
> the code on recent guile 3.0.x is different, with no recursion at all.
>
> SCM_I_GSC_STACK_GROWS_UP=0
> AC_RUN_IFELSE([AC_LANG_SOURCE(
> [AC_INCLUDES_DEFAULT
> int
> find_stack_direction (int *addr, int depth)
> {
> int dir, dummy = 0;
> if (! addr)
> addr = &dummy;
> *addr = addr < &dummy ? 1 : addr == &dummy ? 0 : -1;
> dir = depth ? find_stack_direction (addr, depth - 1) : 0;
^^^^^^^^^^^^^^^^^^^^
This calls find_stack_direction() recursively, isn't it?
> return dir + dummy;
> }
>
> int
> main (int argc, char **argv)
> {
> return find_stack_direction (0, argc + !argv + 20) < 0;
> }])],
Recursion depth seems to be increased to more than 20.
--
Takashi Yano <takashi.yano@nifty.ne.jp>
next prev parent reply other threads:[~2021-03-06 1:07 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-05 12:18 Marco Atzeri
2021-03-05 14:31 ` Takashi Yano
2021-03-05 14:43 ` gs-cygwin.com
2021-03-06 8:29 ` Marco Atzeri
2021-03-06 9:29 ` Thomas Wolff
2021-03-05 15:25 ` Thomas Wolff
2021-03-05 18:58 ` Brian Inglis
2021-03-05 20:29 ` Marco Atzeri
2021-03-06 1:06 ` Takashi Yano [this message]
2021-03-06 9:12 ` Marco Atzeri
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