[M3devel] double double double double checking jmp_buf size/alignment

Fri Mar 5 16:36:57 CET 2010

Mika, Hm. I would have expected 44 for FreeBSD/x86. Needs slightly more investigation.

PPC_DARWIN we agree on.

Thanks,

 - Jay

> To: jay.krell at cornell.edu
> Date: Wed, 6 Jan 2010 08:25:58 -0800
> From: mika at async.async.caltech.edu
> CC: m3devel at elegosoft.com
> Subject: Re: [M3devel] double double double double checking jmp_buf size/alignment
> 
> Forgot the #endif there?
> 
> (81)trs80:~>./a.out
> 48 4
> (82)trs80:~>uname -a
> FreeBSD trs80.async.caltech.edu 4.11-RELEASE FreeBSD 4.11-RELEASE #3: Mon Nov 21 20:27:08 PST 2005 root at trs80.async.caltech.edu:/usr/src/sys/compile/TRS80 i386
> 
> [lapdog:~] mika% cc jay.c
> [lapdog:~] mika% ./a.out
> 768 4
> [lapdog:~] mika% uname -a
> Darwin lapdog 8.11.0 Darwin Kernel Version 8.11.0: Wed Oct 10 18:26:00 PDT 2007; root:xnu-792.24.17~1/RELEASE_PPC Power Macintosh powerpc
> [lapdog:~] mika% 
> 
> Jay K writes:
> >--_b0fc625a-8a60-4f2b-9394-0f52cc975894_
> >Content-Type: text/plain; charset="iso-8859-1"
> >Content-Transfer-Encoding: quoted-printable
> >
> >
> >Was truncated!..edited slightly to avoid..
> >
> >
> >From: jay.krell at cornell.edu
> >To: m3devel at elegosoft.com
> >Subject: double double double double checking jmp_buf size/alignment
> >Date: Wed=2C 6 Jan 2010 12:28:02 +0000
> >
> >
> >
> >
> >
> >
> >
> >
> >Getting this right is very important.
> > Well=2C we can overstate but it is wasteful.
> >
> >
> >So anyone with any time=2C please compile/run this and send the "platform" =
> >(uname -a) and the output=2C thanks.
> >Or look at m3-libs/m3core/src/C/*/Csetjmp.i3 and
> >m3-sys/m3middle/src/Target.m3 and see if all three agree.
> >
> >
> >I have checked a bunch of systems myself but extra checking is good.
> >
> >
> >If you have a system we do not yet or any longer support=2C those are ok to=
> >o.
> > (e.g. Alpha_*=2C ARM_*=2C MIPS_*=2C *_Irix=2C *_VMS=2C *_Tru64 etc.)
> >
> >=20
> >#include <setjmp.h>
> >#include <stdio.h>
> >
> >#ifdef __GNUC__
> >#define ALIGN_OF(x) ((int)(sizeof(struct { char a=3B x b=3B }) - sizeof(x))=
> >)
> >#else
> >#define ALIGN_OF(x) ((int)__alignof(x))
> >
> >int main()
> >{
> > printf("%d %d\n"=2C (int)sizeof(jmp_buf)=2C ALIGN_OF(jmp_buf))=3B
> > return 0=3B
> >}
> >
> >
> >Thanks=2C
> > - Jay
> > =
> >
> >--_b0fc625a-8a60-4f2b-9394-0f52cc975894_
> >Content-Type: text/html; charset="iso-8859-1"
> >Content-Transfer-Encoding: quoted-printable
> >
> ><html>
> ><head>
> ><style><!--
> >.hmmessage P
> >{
> >margin:0px=3B
> >padding:0px
> >}
> >body.hmmessage
> >{
> >font-size: 10pt=3B
> >font-family:Verdana
> >}
> >--></style>
> ></head>
> ><body class=3D'hmmessage'>
> >Was truncated!..edited slightly to avoid..<br><br><br><hr id=3D"stopSpellin=
> >g">From: jay.krell at cornell.edu<br>To: m3devel at elegosoft.com<br>Subject: dou=
> >ble double double double checking jmp_buf size/alignment<br>Date: Wed=2C 6 =
> >Jan 2010 12:28:02 +0000<br><br>
> >
> >
> >
> ><style>
> >.ExternalClass .ecxhmmessage P
> >{padding:0px=3B}
> >.ExternalClass body.ecxhmmessage
> >{font-size:10pt=3Bfont-family:Verdana=3B}
> ></style>
> >
> >
> >Getting this right is very important.<br>&nbsp=3B Well=2C we can overstate =
> >but it is wasteful.<br><br><br>So anyone with any time=2C please compile/ru=
> >n this and send the "platform" (uname -a) and the output=2C thanks.<br>Or l=
> >ook at m3-libs/m3core/src/C/*/Csetjmp.i3 and<br>m3-sys/m3middle/src/Target.=
> >m3 and see if all three agree.<br><br><br>I have checked a bunch of systems=
> > myself but extra checking is good.<br><br><br>If you have a system we do n=
> >ot yet or any longer support=2C those are ok too.<br>&nbsp=3B(e.g. Alpha_*=
> >=2C ARM_*=2C MIPS_*=2C *_Irix=2C *_VMS=2C *_Tru64 etc.)<br><br>&nbsp=3B<br>=
> >#include &lt=3Bsetjmp.h&gt=3B<br>#include &lt=3Bstdio.h&gt=3B<br><br>#ifdef=
> > __GNUC__<br>#define ALIGN_OF(x) ((int)(sizeof(struct { char a=3B x b=3B })=
> > - sizeof(x)))<br>#else<br>#define ALIGN_OF(x) ((int)__alignof(x))<br><br>i=
> >nt main()<br>{<br>&nbsp=3B printf("%d %d\n"=2C (int)sizeof(jmp_buf)=2C ALIG=
> >N_OF(jmp_buf))=3B<br>&nbsp=3B return 0=3B<br>}<br><br><br>Thanks=2C<br>&nbs=
> >p=3B- Jay<br> </body>
> ></html>=
> >
> >--_b0fc625a-8a60-4f2b-9394-0f52cc975894_--

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