87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/*
|
|
** $Id: lmem.c,v 1.70.1.1 2007/12/27 13:02:25 roberto Exp $
|
|
** Interface to Memory Manager
|
|
** See Copyright Notice in lua.h
|
|
*/
|
|
|
|
|
|
#include "c_stddef.h"
|
|
|
|
#define lmem_c
|
|
#define LUA_CORE
|
|
|
|
#include "lua.h"
|
|
|
|
#include "ldebug.h"
|
|
#include "ldo.h"
|
|
#include "lmem.h"
|
|
#include "lobject.h"
|
|
#include "lstate.h"
|
|
|
|
|
|
|
|
/*
|
|
** About the realloc function:
|
|
** void * frealloc (void *ud, void *ptr, size_t osize, size_t nsize);
|
|
** (`osize' is the old size, `nsize' is the new size)
|
|
**
|
|
** Lua ensures that (ptr == NULL) iff (osize == 0).
|
|
**
|
|
** * frealloc(ud, NULL, 0, x) creates a new block of size `x'
|
|
**
|
|
** * frealloc(ud, p, x, 0) frees the block `p'
|
|
** (in this specific case, frealloc must return NULL).
|
|
** particularly, frealloc(ud, NULL, 0, 0) does nothing
|
|
** (which is equivalent to free(NULL) in ANSI C)
|
|
**
|
|
** frealloc returns NULL if it cannot create or reallocate the area
|
|
** (any reallocation to an equal or smaller size cannot fail!)
|
|
*/
|
|
|
|
|
|
|
|
#define MINSIZEARRAY 4
|
|
|
|
|
|
void *ICACHE_FLASH_ATTR luaM_growaux_ (lua_State *L, void *block, int *size, size_t size_elems,
|
|
int limit, const char *errormsg) {
|
|
void *newblock;
|
|
int newsize;
|
|
if (*size >= limit/2) { /* cannot double it? */
|
|
if (*size >= limit) /* cannot grow even a little? */
|
|
luaG_runerror(L, errormsg);
|
|
newsize = limit; /* still have at least one free place */
|
|
}
|
|
else {
|
|
newsize = (*size)*2;
|
|
if (newsize < MINSIZEARRAY)
|
|
newsize = MINSIZEARRAY; /* minimum size */
|
|
}
|
|
newblock = luaM_reallocv(L, block, *size, newsize, size_elems);
|
|
*size = newsize; /* update only when everything else is OK */
|
|
return newblock;
|
|
}
|
|
|
|
|
|
void *ICACHE_FLASH_ATTR luaM_toobig (lua_State *L) {
|
|
luaG_runerror(L, "memory allocation error: block too big");
|
|
return NULL; /* to avoid warnings */
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
** generic allocation routine.
|
|
*/
|
|
void *ICACHE_FLASH_ATTR luaM_realloc_ (lua_State *L, void *block, size_t osize, size_t nsize) {
|
|
global_State *g = G(L);
|
|
lua_assert((osize == 0) == (block == NULL));
|
|
block = (*g->frealloc)(g->ud, block, osize, nsize);
|
|
if (block == NULL && nsize > 0)
|
|
luaD_throw(L, LUA_ERRMEM);
|
|
lua_assert((nsize == 0) == (block == NULL));
|
|
g->totalbytes = (g->totalbytes - osize) + nsize;
|
|
return block;
|
|
}
|
|
|