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Message-Id: <1435101895-18240-4-git-send-email-amonakov@ispras.ru>
Date: Wed, 24 Jun 2015 02:24:53 +0300
From: Alexander Monakov <amonakov@...ras.ru>
To: musl@...ts.openwall.com
Cc: Alexander Monakov <amonakov@...ras.ru>
Subject: [PATCH 3/5] dynlink.c: slim down gnu_lookup
Do not reference dso->syms and dso-strings until point of use.
Check 'h1 == (h2|1)', the simplest condition, before the others.
---
src/ldso/dynlink.c | 14 +++++---------
1 file changed, 5 insertions(+), 9 deletions(-)
diff --git a/src/ldso/dynlink.c b/src/ldso/dynlink.c
index 99dadd4..28812ef 100644
--- a/src/ldso/dynlink.c
+++ b/src/ldso/dynlink.c
@@ -237,24 +237,20 @@ static Sym *sysv_lookup(const char *s, uint32_t h, struct dso *dso)
static Sym *gnu_lookup(const char *s, uint32_t h1, struct dso *dso)
{
- Sym *syms = dso->syms;
- char *strings = dso->strings;
uint32_t *hashtab = dso->ghashtab;
uint32_t nbuckets = hashtab[0];
uint32_t *buckets = hashtab + 4 + hashtab[2]*(sizeof(size_t)/4);
- uint32_t h2;
- uint32_t *hashval;
uint32_t i = buckets[umod(h1, nbuckets, &dso->gudiv)];
if (!i) return 0;
- hashval = buckets + nbuckets + (i - hashtab[1]);
+ uint32_t *hashval = buckets + nbuckets + (i - hashtab[1]);
for (h1 |= 1; ; i++) {
- h2 = *hashval++;
- if ((!dso->versym || dso->versym[i] >= 0)
- && (h1 == (h2|1)) && !strcmp(s, strings + syms[i].st_name))
- return syms+i;
+ uint32_t h2 = *hashval++;
+ if ((h1 == (h2|1)) && (!dso->versym || dso->versym[i] >= 0)
+ && !strcmp(s, dso->strings + dso->syms[i].st_name))
+ return dso->syms+i;
if (h2 & 1) break;
}
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