From: Andrea Corallo <akrl@sdf.org>
To: Eli Zaretskii <eliz@gnu.org>
Cc: andrewjmoreton@gmail.com, 60996@debbugs.gnu.org
Subject: bug#60996: 29.0.60; Native compile fails to remove temp file for trampoline
Date: Fri, 27 Jan 2023 09:51:04 +0000 [thread overview]
Message-ID: <xjfo7qk8fw7.fsf@ma.sdf.org> (raw)
In-Reply-To: <83mt65c9vv.fsf@gnu.org> (Eli Zaretskii's message of "Thu, 26 Jan 2023 22:35:00 +0200")
Eli Zaretskii <eliz@gnu.org> writes:
>> Cc: andrewjmoreton@gmail.com, 60996@debbugs.gnu.org
>> Date: Thu, 26 Jan 2023 20:38:45 +0200
>> From: Eli Zaretskii <eliz@gnu.org>
>>
>> > The only case where we might do that AFAIR is when
>> > `inhibit-automatic-native-compilation' is used. This was the infamous
>> > mechanism that was installed by Lars where, if I'm not wrong, we are
>> > supposed to compile a trampoline, load it, and remove it to pretend we
>> > didn't compiled anything :x
>>
>> OK, this seems to be what is happening here, because we compile the
>> trampoline to a temporary directory. Otherwise, I don't see why we
>> would do that, and why we would delete a trampoline we just compiled.
>
> Actually, I don't think I see where we delete the trampoline that we
> generated when inhibit-automatic-native-compilation is non-nil. Can
> you point me to the code which does that?
Sure, the code behind this mechanism is not straightforward and took me
a bit to decipher it as well yesterday.
In `comp-trampoline-compile' when `inhibit-automatic-native-compilation'
is not nil we invoke `comp--native-compile' with the `output' parameter
set to null.
`comp--native-compile' after compiling does two things:
1- If the compilation input was a file returns the .eln filename
2- If the input was a lambda (the case for trampolines) it does return
the compiled subr. To do that it preforms a load of the eln before
returning.
So in general what `comp--native-compile' returns is:
(if (stringp function-or-file)
data
;; So we return the compiled function.
(native-elisp-load data)))
But at the end of `comp--native-compile' this when was added
(when (and (not (stringp function-or-file))
(not output)
comp-ctxt
(comp-ctxt-output comp-ctxt)
(file-exists-p (comp-ctxt-output comp-ctxt)))
(delete-file (comp-ctxt-output comp-ctxt)))
Took me a while to actually realize this is the unwindform of an
enormous `unwind-protect'. Anyway this is the code that when `output'
is null (the case for trampolines) tries to performs the file
deletetion.
Best Regards
Andrea
next prev parent reply other threads:[~2023-01-27 9:51 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-21 22:12 bug#60996: 29.0.60; Native compile fails to remove temp file for trampoline Andy Moreton
2023-01-22 6:17 ` Eli Zaretskii
2023-01-22 12:51 ` Andy Moreton
2023-01-23 17:04 ` Andrea Corallo
2023-01-23 17:11 ` Eli Zaretskii
2023-01-26 16:50 ` Andrea Corallo
2023-01-26 18:38 ` Eli Zaretskii
2023-01-26 19:46 ` Andrea Corallo
2023-01-26 20:03 ` Eli Zaretskii
2023-01-26 20:25 ` Andrea Corallo
2023-01-27 13:00 ` Eli Zaretskii
2023-01-27 13:56 ` Andrea Corallo
2023-01-26 20:35 ` Eli Zaretskii
2023-01-27 9:51 ` Andrea Corallo [this message]
2023-01-28 21:15 ` Andy Moreton
2023-01-29 7:01 ` Eli Zaretskii
2023-01-29 7:23 ` Eli Zaretskii
2023-01-30 10:11 ` Andrea Corallo
2023-01-29 7:47 ` Eli Zaretskii
2023-01-29 11:37 ` Andy Moreton
2023-01-29 13:50 ` Eli Zaretskii
2023-01-29 13:50 ` Eli Zaretskii
2023-01-23 2:30 ` Andy Moreton
2023-01-23 14:58 ` Eli Zaretskii
2023-01-24 1:18 ` Andy Moreton
2023-01-24 12:56 ` Eli Zaretskii
2023-01-24 17:50 ` Eli Zaretskii
2023-01-24 19:12 ` Eli Zaretskii
2023-01-24 22:32 ` Andy Moreton
2023-01-25 11:58 ` Eli Zaretskii
2023-01-25 23:49 ` Andy Moreton
2023-01-26 6:51 ` Eli Zaretskii
2023-01-26 16:57 ` Andrea Corallo
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