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Bug: segfault in imcc parsing bad if statement
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Gopal V  
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 More options Nov 12 2004, 1:16 pm
Newsgroups: perl.perl6.internals
From: parrotbug-follo...@parrotcode.org (Gopal V)
Date: Fri, 12 Nov 2004 10:16:31 -0800
Local: Fri, Nov 12 2004 1:16 pm
Subject: [perl #32421] Bug: segfault in imcc parsing bad if statement
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# New Ticket Created by  Gopal V
# Please include the string:  [perl #32421]
# in the subject line of all future correspondence about this issue.
# <URL: http://rt.perl.org:80/rt3/Ticket/Display.html?id=32421 >

The following code segfaults with parrot poicephalus

.sub _MAIN
    $I0=1
    if$I0 < 2  goto LBL1
LBL1:
    end
    ret
.end

Fix at your leisure :)

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Matt Diephouse  
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 More options Nov 12 2004, 4:59 pm
Newsgroups: perl.perl6.internals
From: mdd...@gmail.com (Matt Diephouse)
Date: Fri, 12 Nov 2004 16:59:02 -0500
Local: Fri, Nov 12 2004 4:59 pm
Subject: Re: [perl #32421] Bug: segfault in imcc parsing bad if statement
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On Fri, 12 Nov 2004 10:16:31 -0800, via RT Gopal V

The code works if you put a space between "if" and "$I0":

 .sub _MAIN
    $I0=1
    if $I0 < 2 goto LBL1
 LBL1:
    end
    ret
 .end

--
matt diephouse
http://matt.diephouse.com


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Dan Sugalski  
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 More options Nov 12 2004, 5:05 pm
Newsgroups: perl.perl6.internals
From: d...@sidhe.org (Dan Sugalski)
Date: Fri, 12 Nov 2004 17:05:44 -0500
Local: Fri, Nov 12 2004 5:05 pm
Subject: Re: [perl #32421] Bug: segfault in imcc parsing bad if statement
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At 4:59 PM -0500 11/12/04, Matt Diephouse wrote:

Right, but the pir parser shouldn't segfault on bad input.
--
                                Dan

--------------------------------------it's like this-------------------
Dan Sugalski                          even samurai
d...@sidhe.org                         have teddy bears and even
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Leopold Toetsch  
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 More options Nov 12 2004, 5:07 pm
Newsgroups: perl.perl6.internals
From: l...@toetsch.at (Leopold Toetsch)
Date: Fri, 12 Nov 2004 23:07:36 +0100
Local: Fri, Nov 12 2004 5:07 pm
Subject: Re: [perl #32421] Bug: segfault in imcc parsing bad if statement
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[This message has also been posted.]

Gopal V <parrotbug-follo...@parrotcode.org> wrote:
> # New Ticket Created by  Gopal V
> # Please include the string:  [perl #32421]
> # in the subject line of all future correspondence about this issue.
> # <URL: http://rt.perl.org:80/rt3/Ticket/Display.html?id=32421 >
> The following code segfaults with parrot poicephalus
> .sub _MAIN
>     $I0=1
>     if$I0 < 2  goto LBL1

      ^^^^^

Segfault in the lexer. Bad.

349                 sprintf(label, "%s%d", yytext, frames->label);
(gdb) p frames
$1 = (struct macro_frame_t *) 0x0

leo


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Gopal V  
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 More options Nov 13 2004, 8:23 am
Newsgroups: perl.perl6.internals
From: gopal...@yahoo.com (Gopal V)
Date: Sat, 13 Nov 2004 05:23:33 -0800 (PST)
Local: Sat, Nov 13 2004 8:23 am
Subject: Re: [perl #32421] Bug: segfault in imcc parsing bad if statement
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> Segfault in the lexer. Bad.

> 349                 sprintf(label, "%s%d", yytext,
> frames->label);
> (gdb) p frames
> $1 = (struct macro_frame_t *) 0x0

I didn't know how or why or what a frame is in this
context which is why this isn't a patch :)

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Leopold Toetsch  
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 More options Nov 16 2004, 3:55 am
Newsgroups: perl.perl6.internals
From: l...@toetsch.at (Leopold Toetsch)
Date: Tue, 16 Nov 2004 09:55:00 +0100
Subject: Re: [perl #32421] Bug: segfault in imcc parsing bad if statement
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Gopal V <gopal...@yahoo.com> wrote:
>> Segfault in the lexer. Bad.

>> 349                 sprintf(label, "%s%d", yytext,
>> frames->label);
>> (gdb) p frames
>> $1 = (struct macro_frame_t *) 0x0
> I didn't know how or why or what a frame is in this
> context which is why this isn't a patch :)

No problem. The syntax {ID}$ is used internally during the expansion of
local labels inside macros, which happen to be accumulated in frame
structures.

Fixed.

Thanks for reporting,
leo


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