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Work around aliasing issues detected in modern GCC.

Browse Source 
Avoid casting gymnastics that lead to pointer aliasing by introducing an
inline function as done in NetBSD (but without #if0'd WIP code).

Obtained from:	NetBSD (CVS Rev. 1.24, 1.25)
This commit is contained in:
Pedro F. Giffuni 2016-03-04 15:30:41 +00:00
parent 7bfed09e02
commit ef2c4fae74
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=296386
1 changed files with 20 additions and 16 deletions
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36
lib/libc/rpc/clnt_vc.c
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@ -502,6 +502,20 @@ clnt_vc_abort(CLIENT *cl)
{
}
static __inline void
htonlp(void *dst, const void *src, uint32_t incr)
{
/* We are aligned, so we think */
*(uint32_t *)dst = htonl(*(const uint32_t *)src + incr);
}
static __inline void
ntohlp(void *dst, const void *src)
{
/* We are aligned, so we think */
*(uint32_t *)dst = htonl(*(const uint32_t *)src);
}
static bool_t
clnt_vc_control(CLIENT *cl, u_int request, void *info)
{
@ -576,14 +590,12 @@ clnt_vc_control(CLIENT *cl, u_int request, void *info)
* first element in the call structure
* This will get the xid of the PREVIOUS call
*/
*(u_int32_t *)info =
ntohl(*(u_int32_t *)(void *)&ct->ct_u.ct_mcalli);
ntohlp(info, &ct->ct_u.ct_mcalli);
break;
case CLSET_XID:
/* This will set the xid of the NEXT call */
*(u_int32_t *)(void *)&ct->ct_u.ct_mcalli =
htonl(*((u_int32_t *)info) + 1);
/* increment by 1 as clnt_vc_call() decrements once */
htonlp(&ct->ct_u.ct_mcalli, info, 1);
break;
case CLGET_VERS:
/*
@ -592,15 +604,11 @@ clnt_vc_control(CLIENT *cl, u_int request, void *info)
* begining of the RPC header. MUST be changed if the
* call_struct is changed
*/
*(u_int32_t *)info =
ntohl(*(u_int32_t *)(void *)(ct->ct_u.ct_mcallc +
4 * BYTES_PER_XDR_UNIT));
ntohlp(info, ct->ct_u.ct_mcallc + 4 * BYTES_PER_XDR_UNIT);
break;
case CLSET_VERS:
*(u_int32_t *)(void *)(ct->ct_u.ct_mcallc +
4 * BYTES_PER_XDR_UNIT) =
htonl(*(u_int32_t *)info);
htonlp(ct->ct_u.ct_mcallc + 4 * BYTES_PER_XDR_UNIT, info, 0);
break;
case CLGET_PROG:
@ -610,15 +618,11 @@ clnt_vc_control(CLIENT *cl, u_int request, void *info)
* begining of the RPC header. MUST be changed if the
* call_struct is changed
*/
*(u_int32_t *)info =
ntohl(*(u_int32_t *)(void *)(ct->ct_u.ct_mcallc +
3 * BYTES_PER_XDR_UNIT));
ntohlp(info, ct->ct_u.ct_mcallc + 3 * BYTES_PER_XDR_UNIT);
break;
case CLSET_PROG:
*(u_int32_t *)(void *)(ct->ct_u.ct_mcallc +
3 * BYTES_PER_XDR_UNIT) =
htonl(*(u_int32_t *)info);
htonlp(ct->ct_u.ct_mcallc + 3 * BYTES_PER_XDR_UNIT, info, 0);
break;
default: