Function luaM_realloc_

extlibs/lua/src/lmem.c:162–176

** Generic allocation routine. ** If allocation fails while shrinking a block, do not try again; the ** GC shrinks some blocks and it is not reentrant. */

** GC shrinks some blocks and it is not reentrant.
*/
void *luaM_realloc_ (lua_State *L, void *block, size_t osize, size_t nsize) {
  void *newblock;
  global_State *g = G(L);
  lua_assert((osize == 0) == (block == NULL));
  newblock = firsttry(g, block, osize, nsize);
  if (unlikely(newblock == NULL && nsize > 0)) {
    if (nsize > osize)  /* not shrinking a block? */
      newblock = tryagain(L, block, osize, nsize);
    if (newblock == NULL)  /* still no memory? */
      return NULL;  /* do not update 'GCdebt' */
  }
  lua_assert((nsize == 0) == (newblock == NULL));
  g->GCdebt = (g->GCdebt + nsize) - osize;
  return newblock;
}


void *luaM_saferealloc_ (lua_State *L, void *block, size_t osize,