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dynlink.c: pass gnu-hash table pointer to gnu_lookup

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The callers need to check the value of the pointer anyway, so make
them pass the pointer to gnu_lookup instead of reloading it there.

Reorder gnu_lookup arguments so that always-used ones are listed
first. GCC can choose a calling convention with arguments in registers
(e.g. up to 3 arguments in eax, ecx, edx on x86), but cannot reorder
the arguments for static functions.
This commit is contained in:
Alexander Monakov 2015-06-28 02:48:33 +03:00 committed by Rich Felker
parent 5b4286e12c
commit 8f08a58c63
1 changed files with 11 additions and 13 deletions
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24
src/ldso/dynlink.c
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@ -174,9 +174,8 @@ static Sym *sysv_lookup(const char *s, uint32_t h, struct dso *dso)
return 0;
}
static Sym *gnu_lookup(const char *s, uint32_t h1, struct dso *dso)
static Sym *gnu_lookup(uint32_t h1, uint32_t *hashtab, struct dso *dso, const char *s)
{
uint32_t *hashtab = dso->ghashtab;
uint32_t nbuckets = hashtab[0];
uint32_t *buckets = hashtab + 4 + hashtab[2]*(sizeof(size_t)/4);
uint32_t i = buckets[h1 % nbuckets];
@ -196,9 +195,8 @@ static Sym *gnu_lookup(const char *s, uint32_t h1, struct dso *dso)
return 0;
}
static Sym *gnu_lookup_filtered(const char *s, uint32_t h1, struct dso *dso, uint32_t fofs, size_t fmask)
static Sym *gnu_lookup_filtered(uint32_t h1, uint32_t *hashtab, struct dso *dso, const char *s, uint32_t fofs, size_t fmask)
{
uint32_t *hashtab = dso->ghashtab;
const size_t *bloomwords = (const void *)(hashtab+4);
size_t f = bloomwords[fofs & (hashtab[2]-1)];
if (!(f & fmask)) return 0;
@ -206,7 +204,7 @@ static Sym *gnu_lookup_filtered(const char *s, uint32_t h1, struct dso *dso, uin
f >>= (h1 >> hashtab[3]) % (8 * sizeof f);
if (!(f & 1)) return 0;
return gnu_lookup(s, h1, dso);
return gnu_lookup(h1, hashtab, dso, s);
}
#define OK_TYPES (1<<STT_NOTYPE | 1<<STT_OBJECT | 1<<STT_FUNC | 1<<STT_COMMON | 1<<STT_TLS)
@ -218,20 +216,20 @@ static Sym *gnu_lookup_filtered(const char *s, uint32_t h1, struct dso *dso, uin
static struct symdef find_sym(struct dso *dso, const char *s, int need_def)
{
uint32_t h = 0, gh, gho;
uint32_t h = 0, gh, gho, *ght;
size_t ghm = 0;
struct symdef def = {0};
for (; dso; dso=dso->next) {
Sym *sym;
if (!dso->global) continue;
if (dso->ghashtab) {
if ((ght = dso->ghashtab)) {
if (!ghm) {
gh = gnu_hash(s);
int maskbits = 8 * sizeof ghm;
gho = gh / maskbits;
ghm = 1ul << gh % maskbits;
}
sym = gnu_lookup_filtered(s, gh, dso, gho, ghm);
sym = gnu_lookup_filtered(gh, ght, dso, s, gho, ghm);
} else {
if (!h) h = sysv_hash(s);
sym = sysv_lookup(s, h, dso);
@ -1559,7 +1557,7 @@ void *__tls_get_addr(size_t *);
static void *do_dlsym(struct dso *p, const char *s, void *ra)
{
size_t i;
uint32_t h = 0, gh = 0;
uint32_t h = 0, gh = 0, *ght;
Sym *sym;
if (p == head || p == RTLD_DEFAULT || p == RTLD_NEXT) {
if (p == RTLD_DEFAULT) {
@ -1577,9 +1575,9 @@ static void *do_dlsym(struct dso *p, const char *s, void *ra)
}
if (invalid_dso_handle(p))
return 0;
if (p->ghashtab) {
if ((ght = p->ghashtab)) {
gh = gnu_hash(s);
sym = gnu_lookup(s, gh, p);
sym = gnu_lookup(gh, ght, p, s);
} else {
h = sysv_hash(s);
sym = sysv_lookup(s, h, p);
@ -1589,9 +1587,9 @@ static void *do_dlsym(struct dso *p, const char *s, void *ra)
if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES))
return p->base + sym->st_value;
if (p->deps) for (i=0; p->deps[i]; i++) {
if (p->deps[i]->ghashtab) {
if ((ght = p->deps[i]->ghashtab)) {
if (!gh) gh = gnu_hash(s);
sym = gnu_lookup(s, gh, p->deps[i]);
sym = gnu_lookup(gh, ght, p->deps[i], s);
} else {
if (!h) h = sysv_hash(s);
sym = sysv_lookup(s, h, p->deps[i]);