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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <assert.h>
#include <unistd.h>
#include <lua5.4/lua.h>
#include <lua5.4/lauxlib.h>
#include <lua5.4/lualib.h>
static void get_random(uint8_t *dst, size_t count) {
int fd = open("/dev/urandom", O_RDONLY);
assert(count == read(fd, dst, count));
close(fd);
}
#if defined(ALLOC_MAGIC_BUDDY)
#include "magic_buddy/magic_buddy.h"
const size_t POOL_SIZE = 1024 * 1024 * 1024;
static struct buddy BUDDY;
static void init_allocator() {
uint8_t magic[MAGIC_COOKIE_BYTES];
get_random(magic, MAGIC_COOKIE_BYTES);
uint8_t *pool = malloc(POOL_SIZE);
init_buddy(pool, POOL_SIZE, magic, &BUDDY);
}
static void *allocator_fn(void *ud, void *ptr, size_t osize, size_t nsize) {
// https://www.lua.org/manual/5.4/manual.html#4.6
if (!ptr) return allocate(nsize, &BUDDY);
if (nsize == 0) {
liberate(ptr, osize, &BUDDY);
return NULL;
}
return reallocate(ptr, nsize, osize, &BUDDY);
}
#elif defined(ALLOC_GROWING_MAGIC_BUDDY)
#include "magic_buddy/magic_buddy.h"
static size_t POOL_SIZE;
static void *POOL;
static void *END_POOL;
static struct buddy BUDDY;
static void init_allocator() {
uint8_t magic[MAGIC_COOKIE_BYTES];
get_random(magic, MAGIC_COOKIE_BYTES);
POOL_SIZE = 1024;
POOL = sbrk(POOL_SIZE);
assert(POOL != (void *)-1);
init_buddy(POOL, POOL_SIZE, magic, &BUDDY);
}
static int grow_pool() {
if (sbrk(POOL_SIZE) != (void*)((uint8_t*)POOL + POOL_SIZE)) return 0;
POOL_SIZE *= 2;
grow_buddy(POOL, POOL_SIZE, &BUDDY);
return 1;
}
static void *allocator_fn(void *ud, void *ptr, size_t osize, size_t nsize) {
// https://www.lua.org/manual/5.4/manual.html#4.6
void *result = 0;
if (!ptr) {
while (!(result = allocate(nsize, &BUDDY)))
if (!grow_pool()) return 0;
return result;
}
if (nsize == 0) {
liberate(ptr, osize, &BUDDY);
return NULL;
}
while (!(result = reallocate(ptr, nsize, osize, &BUDDY)))
if (!grow_pool()) return 0;
return result;
}
// custom malloc/free/calloc/realloc
void *malloc(size_t s) {
if (!POOL) init_allocator();
size_t *block = allocator_fn((void*)1, 0, 0, s + sizeof(size_t));
*block = s + sizeof(size_t);
return (void*)((uint8_t*)block + sizeof(size_t));
}
void free(void *ptr) {
if (!ptr) return;
if (!POOL) init_allocator();
ptr = (uint8_t*)ptr - sizeof(size_t);
size_t size = *(size_t*)ptr;
allocator_fn((void*)1, ptr, size, 0);
}
void *realloc(void *ptr, size_t nsize) {
if (!POOL) init_allocator();
if (nsize == 0) {
free(ptr);
return 0;
}
ptr = (uint8_t*)ptr - sizeof(size_t);
size_t osize = *(size_t*)ptr;
void *res = allocator_fn((void*)1, ptr, osize, nsize + sizeof(size_t));
*(size_t*)res = nsize + sizeof(size_t);
return (void*)((uint8_t*)res + sizeof(size_t));
}
void *calloc(size_t cnt, size_t size) {
if (!POOL) init_allocator();
uint8_t *data = malloc(cnt * size);
for (size_t i = 0; i < cnt * size; i++) data[i] = 0;
return (void*)data;
}
#elif defined(ALLOC_SYSTEM)
static void init_allocator() { }
static void *allocator_fn(void *ud, void *ptr, size_t osize, size_t nsize) {
// https://www.lua.org/manual/5.4/manual.html#4.6
if (nsize == 0) {
free(ptr);
return NULL;
}
return realloc(ptr, nsize);
}
#else
#error "No allocator chosen!"
#endif
int main(int argc, char **argv) {
init_allocator();
// https://www.lua.org/pil/24.1.html
char buff[256];
int error;
lua_State *L = lua_newstate(allocator_fn, 0); /* opens Lua */
luaL_openlibs(L);
assert(argc == 2);
luaL_dofile(L, argv[1]);
lua_close(L);
return 0;
}
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