SameBoy/Core/symbol_hash.c
Jakub Kądziołka e8bfc4050e
Fix off-by-one in symbol search
Before this commit, printing an address that's after every symbol in a
bank would not show it relative to the last symbol.
2021-02-27 19:29:06 +01:00

109 lines
2.7 KiB
C

#include "gb.h"
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
static size_t GB_map_find_symbol_index(GB_symbol_map_t *map, uint16_t addr)
{
if (!map->symbols) {
return 0;
}
ssize_t min = 0;
ssize_t max = map->n_symbols;
while (min < max) {
size_t pivot = (min + max) / 2;
if (map->symbols[pivot].addr == addr) return pivot;
if (map->symbols[pivot].addr > addr) {
max = pivot;
}
else {
min = pivot + 1;
}
}
return (size_t) min;
}
GB_bank_symbol_t *GB_map_add_symbol(GB_symbol_map_t *map, uint16_t addr, const char *name)
{
size_t index = GB_map_find_symbol_index(map, addr);
map->symbols = realloc(map->symbols, (map->n_symbols + 1) * sizeof(map->symbols[0]));
memmove(&map->symbols[index + 1], &map->symbols[index], (map->n_symbols - index) * sizeof(map->symbols[0]));
map->symbols[index].addr = addr;
map->symbols[index].name = strdup(name);
map->n_symbols++;
return &map->symbols[index];
}
const GB_bank_symbol_t *GB_map_find_symbol(GB_symbol_map_t *map, uint16_t addr)
{
if (!map) return NULL;
size_t index = GB_map_find_symbol_index(map, addr);
if (index >= map->n_symbols || map->symbols[index].addr != addr) {
index--;
}
if (index < map->n_symbols) {
return &map->symbols[index];
}
return NULL;
}
GB_symbol_map_t *GB_map_alloc(void)
{
GB_symbol_map_t *map = malloc(sizeof(*map));
memset(map, 0, sizeof(*map));
return map;
}
void GB_map_free(GB_symbol_map_t *map)
{
for (unsigned i = 0; i < map->n_symbols; i++) {
free(map->symbols[i].name);
}
if (map->symbols) {
free(map->symbols);
}
free(map);
}
static unsigned hash_name(const char *name)
{
unsigned r = 0;
while (*name) {
r <<= 1;
if (r & 0x400) {
r ^= 0x401;
}
r += (unsigned char)*(name++);
}
return r & 0x3FF;
}
void GB_reversed_map_add_symbol(GB_reversed_symbol_map_t *map, uint16_t bank, GB_bank_symbol_t *bank_symbol)
{
unsigned hash = hash_name(bank_symbol->name);
GB_symbol_t *symbol = malloc(sizeof(*symbol));
symbol->name = bank_symbol->name;
symbol->addr = bank_symbol->addr;
symbol->bank = bank;
symbol->next = map->buckets[hash];
map->buckets[hash] = symbol;
}
const GB_symbol_t *GB_reversed_map_find_symbol(GB_reversed_symbol_map_t *map, const char *name)
{
unsigned hash = hash_name(name);
GB_symbol_t *symbol = map->buckets[hash];
while (symbol) {
if (strcmp(symbol->name, name) == 0) return symbol;
symbol = symbol->next;
}
return NULL;
}