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Date: Fri, 6 Feb 2004 10:31:25 +0100
To: perl6-intern...@perl.org
Subject: Re: Alignment Issues with *ManagedStruct?
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References: <1075845748.23721.32.camel@localhost> <200402040852.i148qYa10172@thu8.leo.home> <1075925266.25662.28.camel@localhost> <200402051023.i15ANdK10683@thu8.leo.home> <x71xp9zb4e.fsf@mail.sysarch.com> <200402051821.i15ILgo03637@thu8.leo.home> <x74qu5xn6d.fsf@mail.sysarch.com> <200402052315.i15NFhV04715@thu8.leo.home> <x7broduka4.fsf@mail.sysarch.com> <x7y8rhszmo.fsf@mail.sysarch.com>
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Approved: n...@nntp.perl.org
From: lu...@debian.org (Paolo Molaro)

On 02/05/04 Uri Guttman wrote:
> with this struct (from leo with some minor changes):
> 
> struct xt {
> 	char x;
> 	struct yt {
> 		char i,k;
> 		int  j;
> 	} Y;
> 	char z;
> } X;
> 
> and this trivial script (i pass the filename on the command line):
[...]
> i get this lovely output:
> 
> struct yt
>         char i : offset 0
>         char k : offset 1
>         int j : offset 2
> struct xt
>         char x : offset 0
>         struct yt Y : offset 1
>         char z : offset 7
[...]
> BTW, this was on a sparc/solaris box.

The offsets look incorrect. On basically every modern 32 or 64 bit
OS (with sizeof(int) == 4) it should look like:

struct yt (size=8, alignment=4)
        char i : offset 0
        char k : offset 1
        int j : offset 4

struct xt (size=16, alignment=4)
        char x : offset 0
        struct yt Y : offset 4
        char z : offset 12

lupus

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