initial import of the C runtime

This commit is contained in:
kr.angelov
2012-01-20 13:41:10 +00:00
parent b972835712
commit 2eee382a62
94 changed files with 14344 additions and 1277 deletions

353
src/runtime/c/gu/map.c Normal file
View File

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#include <gu/defs.h>
#include <gu/mem.h>
#include <gu/type.h>
#include <gu/map.h>
#include <gu/assert.h>
#include <gu/prime.h>
#include <gu/log.h>
typedef enum {
GU_MAP_GENERIC,
GU_MAP_ADDR,
GU_MAP_WORD
} GuMapKind;
typedef struct GuMapData GuMapData;
struct GuMapData {
uint8_t* keys;
uint8_t* values;
size_t n_occupied;
size_t n_entries;
size_t zero_idx;
};
struct GuMap {
GuMapKind const kind;
GuHasher* const hasher;
size_t const key_size;
size_t const value_size;
const void* default_value;
GuMapData data;
GuFinalizer fin;
};
static void
gu_map_finalize(GuFinalizer* fin)
{
GuMap* map = gu_container(fin, GuMap, fin);
gu_mem_buf_free(map->data.keys);
if (map->value_size) {
gu_mem_buf_free(map->data.values);
}
}
static const GuWord gu_map_empty_key = 0;
static bool
gu_map_buf_is_zero(const uint8_t* p, size_t sz) {
while (sz >= sizeof(GuWord)) {
sz -= sizeof(GuWord);
if (memcmp(&p[sz], &gu_map_empty_key, sizeof(GuWord)) != 0) {
return false;
}
}
return (memcmp(p, &gu_map_empty_key, sz) == 0);
}
static bool
gu_map_entry_is_free(GuMap* map, GuMapData* data, size_t idx)
{
if (idx == data->zero_idx) {
return false;
} else if (map->kind == GU_MAP_ADDR) {
const void* key = ((const void**)data->keys)[idx];
return key == NULL;
} else if (map->kind == GU_MAP_WORD) {
GuWord key = ((GuWord*)data->keys)[idx];
return key == 0;
}
gu_assert(map->kind == GU_MAP_GENERIC);
const void* key = &data->keys[idx * map->key_size];
return gu_map_buf_is_zero(key, map->key_size);
}
static bool
gu_map_lookup(GuMap* map, const void* key, size_t* idx_out)
{
size_t n = map->data.n_entries;
switch (map->kind) {
case GU_MAP_GENERIC: {
GuHasher* hasher = map->hasher;
GuEquality* eq = (GuEquality*) hasher;
GuHash hash = hasher->hash(hasher, key);
size_t idx = hash % n;
size_t offset = (hash % (n - 2)) + 1;
size_t key_size = map->key_size;
while (true) {
void* entry_key = &map->data.keys[idx * key_size];
if (gu_map_buf_is_zero(entry_key, key_size) &&
map->data.zero_idx != idx) {
*idx_out = idx;
return false;
} else if (eq->is_equal(eq, key, entry_key)) {
*idx_out = idx;
return true;
}
idx = (idx + offset) % n;
}
gu_impossible();
break;
}
case GU_MAP_ADDR: {
GuHash hash = (GuHash) key;
size_t idx = hash % n;
size_t offset = (hash % (n - 2)) + 1;
while (true) {
const void* entry_key =
((const void**)map->data.keys)[idx];
if (entry_key == NULL && map->data.zero_idx != idx) {
*idx_out = idx;
return false;
} else if (entry_key == key) {
*idx_out = idx;
return true;
}
idx = (idx + offset) % n;
}
gu_impossible();
break;
}
case GU_MAP_WORD: {
GuWord w = *(const GuWord*)key;
GuHash hash = (GuHash) w;
size_t idx = hash % n;
size_t offset = (hash % (n - 2)) + 1;
while (true) {
GuWord entry_key = ((GuWord*)map->data.keys)[idx];
if (entry_key == 0 && map->data.zero_idx != idx) {
*idx_out = idx;
return false;
} else if (entry_key == w) {
*idx_out = idx;
return true;
}
idx = (idx + offset) % n;
}
gu_impossible();
break;
}
default:
gu_impossible();
}
gu_impossible();
return false;
}
static void
gu_map_resize(GuMap* map)
{
GuMapData* data = &map->data;
GuMapData old_data = *data;
size_t req_entries =
gu_twin_prime_sup(GU_MAX(11, map->data.n_occupied * 4 / 3 + 1));
size_t key_size = map->key_size;
size_t key_alloc = 0;
data->keys = gu_mem_buf_alloc(req_entries * key_size, &key_alloc);
size_t value_size = map->value_size;
size_t value_alloc = 0;
if (value_size) {
data->values = gu_mem_buf_alloc(req_entries * value_size,
&value_alloc);
memset(data->values, 0, value_alloc);
}
data->n_entries = gu_twin_prime_inf(value_size ?
GU_MIN(key_alloc / key_size,
value_alloc / value_size)
: key_alloc / key_size);
switch (map->kind) {
case GU_MAP_GENERIC:
case GU_MAP_WORD:
memset(data->keys, 0, key_alloc);
break;
case GU_MAP_ADDR:
for (size_t i = 0; i < data->n_entries; i++) {
((const void**)data->keys)[i] = NULL;
}
break;
default:
gu_impossible();
}
gu_assert(data->n_entries > data->n_occupied);
gu_debug("Resized to %d entries", data->n_entries);
data->n_occupied = 0;
data->zero_idx = SIZE_MAX;
for (size_t i = 0; i < old_data.n_entries; i++) {
if (gu_map_entry_is_free(map, &old_data, i)) {
continue;
}
void* old_key = &old_data.keys[i * key_size];
if (map->kind == GU_MAP_ADDR) {
old_key = *(void**)old_key;
}
void* old_value = &old_data.values[i * value_size];
memcpy(gu_map_insert(map, old_key),
old_value, map->value_size);
}
gu_mem_buf_free(old_data.keys);
if (value_size) {
gu_mem_buf_free(old_data.values);
}
}
static bool
gu_map_maybe_resize(GuMap* map)
{
if (map->data.n_entries <=
map->data.n_occupied + (map->data.n_occupied / 4)) {
gu_map_resize(map);
return true;
}
return false;
}
void*
gu_map_find(GuMap* map, const void* key)
{
size_t idx;
bool found = gu_map_lookup(map, key, &idx);
if (found) {
return &map->data.values[idx * map->value_size];
}
return NULL;
}
const void*
gu_map_find_default(GuMap* map, const void* key)
{
void* p = gu_map_find(map, key);
return p ? p : map->default_value;
}
const void*
gu_map_find_key(GuMap* map, const void* key)
{
size_t idx;
bool found = gu_map_lookup(map, key, &idx);
if (found) {
return &map->data.keys[idx * map->key_size];
}
return NULL;
}
void*
gu_map_insert(GuMap* map, const void* key)
{
size_t idx;
bool found = gu_map_lookup(map, key, &idx);
if (!found) {
if (gu_map_maybe_resize(map)) {
found = gu_map_lookup(map, key, &idx);
gu_assert(!found);
}
if (map->kind == GU_MAP_ADDR) {
((const void**)map->data.keys)[idx] = key;
} else {
memcpy(&map->data.keys[idx * map->key_size],
key, map->key_size);
}
if (map->default_value) {
memcpy(&map->data.values[idx * map->value_size],
map->default_value, map->value_size);
}
if (gu_map_entry_is_free(map, &map->data, idx)) {
gu_assert(map->data.zero_idx == SIZE_MAX);
map->data.zero_idx = idx;
}
map->data.n_occupied++;
}
return &map->data.values[idx * map->value_size];
}
void
gu_map_iter(GuMap* map, GuMapItor* itor, GuExn* err)
{
for (size_t i = 0; i < map->data.n_entries && gu_ok(err); i++) {
if (gu_map_entry_is_free(map, &map->data, i)) {
continue;
}
const void* key = &map->data.keys[i * map->key_size];
void* value = &map->data.values[i * map->value_size];
if (map->kind == GU_MAP_ADDR) {
key = *(const void* const*) key;
}
itor->fn(itor, key, value, err);
}
}
static const uint8_t gu_map_no_values[1] = { 0 };
GuMap*
gu_make_map(size_t key_size, GuHasher* hasher,
size_t value_size, const void* default_value,
GuPool* pool)
{
GuMapKind kind =
((!hasher || hasher == gu_addr_hasher)
? GU_MAP_ADDR
: (key_size == sizeof(GuWord) && hasher == gu_word_hasher)
? GU_MAP_WORD
: GU_MAP_GENERIC);
if (kind == GU_MAP_ADDR) {
key_size = sizeof(GuWord);
}
GuMapData data = {
.n_occupied = 0,
.n_entries = 0,
.keys = NULL,
.values = value_size ? NULL : (uint8_t*) gu_map_no_values,
.zero_idx = SIZE_MAX
};
GuMap* map = gu_new_i(
pool, GuMap,
.default_value = default_value,
.hasher = hasher,
.data = data,
.key_size = key_size,
.value_size = value_size,
.fin.fn = gu_map_finalize,
.kind = kind
);
gu_pool_finally(pool, &map->fin);
gu_map_resize(map);
return map;
}
GuMap*
gu_map_type_make(GuMapType* mtype, GuPool* pool)
{
size_t key_size = 0;
if (mtype->hasher && mtype->hasher != gu_addr_hasher) {
key_size = gu_type_size(mtype->key_type);
}
size_t value_size = gu_type_size(mtype->value_type);
return gu_make_map(key_size, mtype->hasher,
value_size, mtype->default_value, pool);
}
GU_DEFINE_KIND(GuMap, abstract);
// GU_DEFINE_KIND(GuIntMap, GuMap);