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"evil" workaround to the alignment issues: embed an ALLOC_ITEM into 

struct env (other structures defined have no "foreign type with pos-
sible alignment constraints" members) and take care of it while dea-
ling in a struct env instance
This commit is contained in:
tg 2009-04-07 19:43:28 +00:00
parent 48ee59ffd0
commit 8cc7fdb834
3 changed files with 24 additions and 11 deletions
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4
check.t
View File

@ -1,4 +1,4 @@
# $MirOS: src/bin/mksh/check.t,v 1.269 2009/04/06 08:33:36 tg Exp $
# $MirOS: src/bin/mksh/check.t,v 1.270 2009/04/07 19:43:26 tg Exp $
# $OpenBSD: bksl-nl.t,v 1.2 2001/01/28 23:04:56 niklas Exp $
# $OpenBSD: history.t,v 1.5 2001/01/28 23:04:56 niklas Exp $
# $OpenBSD: read.t,v 1.3 2003/03/10 03:48:16 david Exp $
@ -7,7 +7,7 @@
# http://www.research.att.com/~gsf/public/ifs.sh
expected-stdout:
@(#)MIRBSD KSH R37 2009/04/05
@(#)MIRBSD KSH R37 2009/04/07
description:
Check version of shell.
stdin:

24
main.c
View File

@ -13,7 +13,7 @@
#include <locale.h>
#endif
__RCSID("$MirOS: src/bin/mksh/main.c,v 1.124 2009/04/05 12:35:31 tg Exp $");
__RCSID("$MirOS: src/bin/mksh/main.c,v 1.125 2009/04/07 19:43:27 tg Exp $");
extern char **environ;
@ -620,15 +620,23 @@ void
newenv(int type)
{
struct env *ep;
char *cp;
ep = alloc(sizeof (struct env), ATEMP);
ep->type = type;
ep->flags = 0;
/*
* struct env includes ALLOC_ITEM for alignment constraints
* so first get the actually used memory, then assign it
*/
cp = alloc(sizeof (struct env) - ALLOC_SIZE, ATEMP);
ep = (void *)(cp - ALLOC_SIZE); /* undo what alloc() did */
/* initialise public members of struct env (not the ALLOC_ITEM) */
ainit(&ep->area);
ep->oenv = e;
ep->loc = e->loc;
ep->savefd = NULL;
ep->oenv = e;
ep->temps = NULL;
ep->type = type;
ep->flags = 0;
/* jump buffer is invalid because flags == 0 */
e = ep;
}
@ -636,6 +644,7 @@ void
quitenv(struct shf *shf)
{
struct env *ep = e;
char *cp;
int fd;
if (ep->oenv && ep->oenv->loc != ep->loc)
@ -684,7 +693,10 @@ quitenv(struct shf *shf)
reclaim();
e = e->oenv;
afree(ep, ATEMP);
/* free the struct env - tricky due to the ALLOC_ITEM inside */
cp = (void *)ep;
afree(cp + ALLOC_SIZE, ATEMP);
}
/* Called after a fork to cleanup stuff left over from parents environment */

7
sh.h
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@ -102,9 +102,9 @@
#define __SCCSID(x) __IDSTRING(sccsid,x)
#ifdef EXTERN
__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.292 2009/04/07 18:56:51 tg Exp $");
__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.293 2009/04/07 19:43:28 tg Exp $");
#endif
#define MKSH_VERSION "R37 2009/04/05"
#define MKSH_VERSION "R37 2009/04/07"
#ifndef MKSH_INCLUDES_ONLY
@ -445,10 +445,11 @@ EXTERN Area aperm; /* permanent object space */
* parsing & execution environment
*/
extern struct env {
ALLOC_ITEM __alloc_i; /* internal, do not touch */
Area area; /* temporary allocation area */
struct env *oenv; /* link to previous environment */
struct block *loc; /* local variables and functions */
short *savefd; /* original redirected fds */
struct env *oenv; /* link to previous environment */
struct temp *temps; /* temp files */
sigjmp_buf jbuf; /* long jump back to env creator */
short type; /* environment type - see below */