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