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Improve Python tree-shaking

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This commit is contained in:
Justine Tunney 2021-09-06 19:24:10 -07:00
parent 5bb2275788
commit 4f41f2184d
169 changed files with 4182 additions and 2411 deletions
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22
tool/build/lib/interner.c
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@ -134,3 +134,25 @@ size_t internobj(struct Interner *t, const void *data, size_t size) {
size_t intern(struct Interner *t, const char *s) {
return internobj(t, s, strlen(s) + 1);
}
/**
* Returns true if string is interned.
*/
bool isinterned(struct Interner *t, const char *s) {
unsigned hash;
size_t i, n, step;
struct InternerObject *it;
step = 0;
n = strlen(s) + 1;
hash = max(1, crc32c(0, s, n));
it = (struct InternerObject *)t;
do {
i = (hash + step * ((step + 1) >> 1)) & (it->n - 1);
if (it->p[i].hash == hash && it->p[i].index + n <= it->pool.n &&
!memcmp(s, &it->pool.p[it->p[i].index], n)) {
return true;
}
step++;
} while (it->p[i].hash);
return false;
}