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resolv: Replace __builtin_expect with __glibc_unlikely/__glibc_likely

This commit is contained in:
Florian Weimer 2017-04-19 14:29:11 +02:00
parent 3e2cf872a5
commit bee05c9d58
6 changed files with 41 additions and 20 deletions
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10
ChangeLog
View File

@ -1,3 +1,13 @@
2017-04-19 Florian Weimer <fweimer@redhat.com>
* resolv/gai_suspend.c (gai_suspend): Replace __builtin_expect
with __glibc_likely.
* resolv/nss_dns/dns-host.c (getanswer_r, gaih_getanswer_slice):
Replace __builtin_expect with __glibc_unlikely.
* resolv/res_init.c (__res_vinit): Likewise.
* resolv/res_query.c (__libc_res_nquery): Likewise.
* resolv/res_send.c (__libc_res_nsend): Likewise.
2017-04-19 Florian Weimer <fweimer@redhat.com>
[BZ #15722]

2
resolv/gai_suspend.c
View File

@ -141,7 +141,7 @@ gai_suspend (const struct gaicb *const list[], int ent,
/* An error occurred. Possibly it's EINTR. We have to translate
the timeout error report of `pthread_cond_timedwait' to the
form expected from `gai_suspend'. */
if (__builtin_expect (result, ETIMEDOUT) == ETIMEDOUT)
if (__glibc_likely (result == ETIMEDOUT))
result = EAI_AGAIN;
else if (result == EINTR)
result = EAI_INTR;

43
resolv/nss_dns/dns-host.c
View File

@ -619,7 +619,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
ancount = ntohs (hp->ancount);
qdcount = ntohs (hp->qdcount);
cp = answer->buf + HFIXEDSZ;
if (__builtin_expect (qdcount, 1) != 1)
if (__glibc_unlikely (qdcount != 1))
{
*h_errnop = NO_RECOVERY;
return NSS_STATUS_UNAVAIL;
@ -633,7 +633,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
packtmp, sizeof packtmp);
if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1)
{
if (__builtin_expect (errno, 0) == EMSGSIZE)
if (__glibc_unlikely (errno) == EMSGSIZE)
goto too_small;
n = -1;
@ -642,13 +642,19 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
if (n > 0 && bp[0] == '.')
bp[0] = '\0';
if (__builtin_expect (n < 0 || ((*name_ok) (bp) == 0 && (errno = EBADMSG)),
0))
if (__glibc_unlikely (n < 0))
{
*errnop = errno;
*h_errnop = NO_RECOVERY;
return NSS_STATUS_UNAVAIL;
}
if (__glibc_unlikely (name_ok (bp) == 0))
{
errno = EBADMSG;
*errnop = EBADMSG;
*h_errnop = NO_RECOVERY;
return NSS_STATUS_UNAVAIL;
}
cp += n + QFIXEDSZ;
if (qtype == T_A || qtype == T_AAAA)
@ -690,7 +696,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
packtmp, sizeof packtmp);
if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1)
{
if (__builtin_expect (errno, 0) == EMSGSIZE)
if (__glibc_unlikely (errno == EMSGSIZE))
goto too_small;
n = -1;
@ -750,7 +756,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
/* Store alias. */
*ap++ = bp;
n = strlen (bp) + 1; /* For the \0. */
if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN)
if (__glibc_unlikely (n >= MAXHOSTNAMELEN))
{
++had_error;
continue;
@ -761,7 +767,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
n = strlen (tbuf) + 1; /* For the \0. */
if (__glibc_unlikely (n > linebuflen))
goto too_small;
if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN)
if (__glibc_unlikely (n >= MAXHOSTNAMELEN))
{
++had_error;
continue;
@ -789,7 +795,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
n = strlen (tbuf) + 1; /* For the \0. */
if (__glibc_unlikely (n > linebuflen))
goto too_small;
if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN)
if (__glibc_unlikely (n >= MAXHOSTNAMELEN))
{
++had_error;
continue;
@ -821,7 +827,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
packtmp, sizeof packtmp);
if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1)
{
if (__builtin_expect (errno, 0) == EMSGSIZE)
if (__glibc_unlikely (errno == EMSGSIZE))
goto too_small;
n = -1;
@ -854,7 +860,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype,
return NSS_STATUS_SUCCESS;
case T_A:
case T_AAAA:
if (__builtin_expect (strcasecmp (result->h_name, bp), 0) != 0)
if (__glibc_unlikely (strcasecmp (result->h_name, bp) != 0))
{
cp += n;
continue; /* XXX - had_error++ ? */
@ -975,7 +981,7 @@ gaih_getanswer_slice (const querybuf *answer, int anslen, const char *qname,
it later. */
if (n != -1 && __ns_name_ntop (packtmp, buffer, buflen) == -1)
{
if (__builtin_expect (errno, 0) == EMSGSIZE)
if (__glibc_unlikely (errno == EMSGSIZE))
{
too_small:
*errnop = ERANGE;
@ -986,13 +992,19 @@ gaih_getanswer_slice (const querybuf *answer, int anslen, const char *qname,
n = -1;
}
if (__builtin_expect (n < 0 || (res_hnok (buffer) == 0
&& (errno = EBADMSG)), 0))
if (__glibc_unlikely (n < 0))
{
*errnop = errno;
*h_errnop = NO_RECOVERY;
return NSS_STATUS_UNAVAIL;
}
if (__glibc_unlikely (res_hnok (buffer) == 0))
{
errno = EBADMSG;
*errnop = EBADMSG;
*h_errnop = NO_RECOVERY;
return NSS_STATUS_UNAVAIL;
}
cp += n + QFIXEDSZ;
int haveanswer = 0;
@ -1014,7 +1026,7 @@ gaih_getanswer_slice (const querybuf *answer, int anslen, const char *qname,
if (n != -1 &&
(h_namelen = __ns_name_ntop (packtmp, buffer, buflen)) == -1)
{
if (__builtin_expect (errno, 0) == EMSGSIZE)
if (__glibc_unlikely (errno == EMSGSIZE))
goto too_small;
n = -1;
@ -1128,8 +1140,7 @@ gaih_getanswer_slice (const querybuf *answer, int anslen, const char *qname,
buffer += pad;
buflen = buflen > pad ? buflen - pad : 0;
if (__builtin_expect (buflen < sizeof (struct gaih_addrtuple),
0))
if (__glibc_unlikely (buflen < sizeof (struct gaih_addrtuple)))
goto too_small;
*pat = (struct gaih_addrtuple *) buffer;

2
resolv/res_init.c
View File

@ -356,7 +356,7 @@ __res_vinit(res_state statp, int preinit) {
statp->nsort = nsort;
(void) fclose(fp);
}
if (__builtin_expect(statp->nscount == 0, 0)) {
if (__glibc_unlikely (statp->nscount == 0)) {
statp->nsaddr.sin_addr = __inet_makeaddr(IN_LOOPBACKNET, 1);
statp->nsaddr.sin_family = AF_INET;
statp->nsaddr.sin_port = htons(NAMESERVER_PORT);

2
resolv/res_query.c
View File

@ -199,7 +199,7 @@ __libc_res_nquery(res_state statp,
nquery1 = n;
}
if (__builtin_expect (n <= 0, 0) && !use_malloc) {
if (__glibc_unlikely (n <= 0) && !use_malloc) {
/* Retry just in case res_nmkquery failed because of too
short buffer. Shouldn't happen. */
bufsize = (type == T_QUERY_A_AND_AAAA ? 2 : 1) * MAXPACKET;

2
resolv/res_send.c
View File

@ -424,7 +424,7 @@ __libc_res_nsend(res_state statp, const u_char *buf, int buflen,
* Some resolvers want to even out the load on their nameservers.
* Note that RES_BLAST overrides RES_ROTATE.
*/
if (__builtin_expect ((statp->options & RES_ROTATE) != 0, 0)) {
if (__glibc_unlikely ((statp->options & RES_ROTATE) != 0)) {
struct sockaddr_in ina;
struct sockaddr_in6 *inp;
int lastns = statp->nscount - 1;