[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Lisp_Marker size on 32bit systems
From: |
Eli Zaretskii |
Subject: |
Re: Lisp_Marker size on 32bit systems |
Date: |
Fri, 07 Sep 2018 17:19:21 +0300 |
> Cc: address@hidden, address@hidden
> From: Paul Eggert <address@hidden>
> Date: Fri, 7 Sep 2018 06:45:48 -0700
>
> > In file included from lisp.h:35:0,
> > from window.c:25:
> > ../lib/verify.h:207:21: error: static assertion failed: "verify
> > (header_size == sizeof (union vectorlike_header))"
>
> It works for me in that configuration in Fedora 28. I get the following
> values;
> what do you get?
>
> sizeof (ptrdiff_t) = 4
> sizeof (union vectorlike_header) = 4
> offsetof (struct Lisp_Vector, contents) = 4
> offsetof (struct Lisp_Sub_Char_Table, depth) == 4
> offsetof (struct Lisp_Sub_Char_Table, contents) == 12
I obtained the below by building Emacs after commenting out the
offending 'verify':
(gdb) ptype union vectorlike_header
type = union vectorlike_header {
ptrdiff_t size;
}
(gdb) p sizeof(union vectorlike_header)
$3 = 4
(gdb) ptype /o struct Lisp_Vector
/* offset | size */ type = struct Lisp_Vector {
/* 0 | 4 */ union vectorlike_header {
/* 4 */ ptrdiff_t size;
/* total size (bytes): 4 */
} header;
/* XXX 4-byte hole */
/* 8 | 0 */ Lisp_Object contents[];
/* total size (bytes): 8 */
}
(gdb) p sizeof(ptrdiff_t)
$4 = 4
(gdb) ptype /o struct Lisp_Sub_Char_Table
/* offset | size */ type = struct Lisp_Sub_Char_Table {
/* 0 | 4 */ union vectorlike_header {
/* 4 */ ptrdiff_t size;
/* total size (bytes): 4 */
} header;
/* 4 | 4 */ int depth;
/* 8 | 4 */ int min_char;
/* XXX 4-byte hole */
/* 16 | 0 */ Lisp_Object contents[];
/* total size (bytes): 16 */
}
I think GCC aligns the Lisp_Object array within the structures because
a Lisp_Object is an 8-byte data type in this configuration.
- Re: Lisp_Marker size on 32bit systems, (continued)
- Re: Lisp_Marker size on 32bit systems, Eli Zaretskii, 2018/09/07
- Re: Lisp_Marker size on 32bit systems, Paul Eggert, 2018/09/07
- GDB and compiler-operations (was: Lisp_Marker size on 32bit systems), Stefan Monnier, 2018/09/07
- Re: GDB and compiler-operations (was: Lisp_Marker size on 32bit systems), Eli Zaretskii, 2018/09/07
- Re: GDB and compiler-operations, Andreas Schwab, 2018/09/07
- Re: GDB and compiler-operations (was: Lisp_Marker size on 32bit systems), Paul Eggert, 2018/09/07
- Re: GDB and compiler-operations, Stefan Monnier, 2018/09/07
- Re: GDB and compiler-operations, Eli Zaretskii, 2018/09/07
- Re: GDB and compiler-operations, Paul Eggert, 2018/09/07
- Re: GDB and compiler-operations, Tom Tromey, 2018/09/07
- Re: Lisp_Marker size on 32bit systems,
Eli Zaretskii <=
- Re: Lisp_Marker size on 32bit systems, Paul Eggert, 2018/09/07
- Re: Lisp_Marker size on 32bit systems, Eli Zaretskii, 2018/09/07
- Re: Lisp_Marker size on 32bit systems, Paul Eggert, 2018/09/07
- Re: Lisp_Marker size on 32bit systems, Eli Zaretskii, 2018/09/07
- Re: Lisp_Marker size on 32bit systems, Paul Eggert, 2018/09/07
- Re: Lisp_Marker size on 32bit systems, Eli Zaretskii, 2018/09/07
- Re: Lisp_Marker size on 32bit systems, Stefan Monnier, 2018/09/07
- Re: Lisp_Marker size on 32bit systems, Paul Eggert, 2018/09/07
- Re: Lisp_Marker size on 32bit systems, Stefan Monnier, 2018/09/07
- Re: Lisp_Marker size on 32bit systems, Paul Eggert, 2018/09/07