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Integrate more chibicc changes

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This commit is contained in:
Justine Tunney 2020-12-09 13:53:02 -08:00
parent 2ed7956be4
commit 15280753e2
13 changed files with 293 additions and 182 deletions
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14
third_party/chibicc/hashmap.c vendored
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@ -2,7 +2,10 @@
#include "third_party/chibicc/chibicc.h"
#define TOMBSTONE ((void *)-1) // Represents a deleted hash entry
#define INIT_SIZE 16 // initial hash bucket size
#define LOW_WATERMARK 50 // keep usage below 50% after rehashing
#define HIGH_WATERMARK 70 // perform rehash when usage exceeds 70%
#define TOMBSTONE ((void *)-1) // represents deleted hash table entry
static uint64_t fnv_hash(char *s, int len) {
uint64_t hash = 0xcbf29ce484222325;
@ -24,7 +27,8 @@ static void rehash(HashMap *map) {
}
}
size_t cap = map->capacity;
while ((nkeys * 100) / cap >= 50) cap = cap * 2;
while ((nkeys * 100) / cap >= LOW_WATERMARK) cap = cap * 2;
assert(cap > 0);
// Create a new hashmap and copy all key-values.
HashMap map2 = {};
map2.buckets = calloc(cap, sizeof(HashEntry));
@ -56,9 +60,11 @@ static HashEntry *get_entry(HashMap *map, char *key, int keylen) {
static HashEntry *get_or_insert_entry(HashMap *map, char *key, int keylen) {
if (!map->buckets) {
map->buckets = calloc((map->capacity = 16), sizeof(HashEntry));
map->buckets = calloc(INIT_SIZE, sizeof(HashEntry));
map->capacity = INIT_SIZE;
} else if ((map->used * 100) / map->capacity >= HIGH_WATERMARK) {
rehash(map);
}
if ((map->used * 100) / map->capacity >= 70) rehash(map);
uint64_t hash = fnv_hash(key, keylen);
for (int i = 0; i < map->capacity; i++) {
HashEntry *ent = &map->buckets[(hash + i) & (map->capacity - 1)];