mirror of
https://github.com/lua/lua
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90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
/*
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** $Id: lmem.c,v 1.59 2002/10/25 21:29:20 roberto Exp roberto $
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** Interface to Memory Manager
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** See Copyright Notice in lua.h
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*/
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#include <stdlib.h>
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#include "lua.h"
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#include "ldebug.h"
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#include "ldo.h"
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#include "lmem.h"
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#include "lobject.h"
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#include "lstate.h"
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/*
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** definition for realloc function. It must assure that l_realloc(NULL,
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** 0, x) allocates a new block (ANSI C assures that). (`os' is the old
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** block size; some allocators may use that.)
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*/
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#ifndef l_realloc
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#define l_realloc(b,os,s) realloc(b,s)
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#endif
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/*
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** definition for free function. (`os' is the old block size; some
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** allocators may use that.)
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*/
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#ifndef l_free
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#define l_free(b,os) free(b)
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#endif
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#define MINSIZEARRAY 4
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void *luaM_growaux (lua_State *L, void *block, int *size, int size_elems,
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int limit, const char *errormsg) {
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void *newblock;
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int newsize = (*size)*2;
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if (newsize < MINSIZEARRAY)
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newsize = MINSIZEARRAY; /* minimum size */
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else if (*size >= limit/2) { /* cannot double it? */
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if (*size < limit - MINSIZEARRAY) /* try something smaller... */
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newsize = limit; /* still have at least MINSIZEARRAY free places */
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else luaG_runerror(L, errormsg);
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}
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newblock = luaM_realloc(L, block,
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cast(lu_mem, *size)*cast(lu_mem, size_elems),
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cast(lu_mem, newsize)*cast(lu_mem, size_elems));
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*size = newsize; /* update only when everything else is OK */
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return newblock;
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}
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/*
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** generic allocation routine.
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*/
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void *luaM_realloc (lua_State *L, void *block, lu_mem oldsize, lu_mem size) {
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lua_assert((oldsize == 0) == (block == NULL));
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if (size == 0) {
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if (block != NULL) {
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l_free(block, oldsize);
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block = NULL;
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}
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else return NULL; /* avoid `nblocks' computations when oldsize==size==0 */
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}
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else if (size >= MAX_SIZET)
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luaG_runerror(L, "memory allocation error: block too big");
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else {
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block = l_realloc(block, oldsize, size);
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if (block == NULL) {
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if (L)
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luaD_throw(L, LUA_ERRMEM);
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else return NULL; /* error before creating state! */
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}
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}
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if (L) {
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lua_assert(G(L) != NULL && G(L)->nblocks > 0);
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G(L)->nblocks -= oldsize;
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G(L)->nblocks += size;
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}
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return block;
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}
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