module/lua/lmem.h

   1 /*
   2 ** $Id: lmem.h,v 1.40.1.1 2013/04/12 18:48:47 roberto Exp $
   3 ** Interface to Memory Manager
   4 ** See Copyright Notice in lua.h
   5 */
   6
   7 #ifndef lmem_h
   8 #define lmem_h
   9
  10
  11 #include "llimits.h"
  12 #include <sys/lua/lua.h>
  13
  14
  15 /*
  16 ** This macro avoids the runtime division MAX_SIZET/(e), as 'e' is
  17 ** always constant.
  18 ** The macro is somewhat complex to avoid warnings:
  19 ** +1 avoids warnings of "comparison has constant result";
  20 ** cast to 'void' avoids warnings of "value unused".
  21 */
  22 #define luaM_reallocv(L,b,on,n,e) \
  23   (cast(void, \
  24      (cast(size_t, (n)+1) > MAX_SIZET/(e)) ? (luaM_toobig(L), 0) : 0), \
  25    luaM_realloc_(L, (b), (on)*(e), (n)*(e)))
  26
  27 #define luaM_freemem(L, b, s)   luaM_realloc_(L, (b), (s), 0)
  28 #define luaM_free(L, b)         luaM_realloc_(L, (b), sizeof(*(b)), 0)
  29 #define luaM_freearray(L, b, n)   luaM_reallocv(L, (b), n, 0, sizeof((b)[0]))
  30
  31 #define luaM_malloc(L,s)        luaM_realloc_(L, NULL, 0, (s))
  32 #define luaM_new(L,t)           cast(t *, luaM_malloc(L, sizeof(t)))
  33 #define luaM_newvector(L,n,t) \
  34                 cast(t *, luaM_reallocv(L, NULL, 0, n, sizeof(t)))
  35
  36 #define luaM_newobject(L,tag,s) luaM_realloc_(L, NULL, tag, (s))
  37
  38 #define luaM_growvector(L,v,nelems,size,t,limit,e) \
  39           if ((nelems)+1 > (size)) \
  40             ((v)=cast(t *, luaM_growaux_(L,v,&(size),sizeof(t),limit,e)))
  41
  42 #define luaM_reallocvector(L, v,oldn,n,t) \
  43    ((v)=cast(t *, luaM_reallocv(L, v, oldn, n, sizeof(t))))
  44
  45 LUAI_FUNC l_noret luaM_toobig (lua_State *L);
  46
  47 /* not to be called directly */
  48 LUAI_FUNC void *luaM_realloc_ (lua_State *L, void *block, size_t oldsize,
  49                                                           size_t size);
  50 LUAI_FUNC void *luaM_growaux_ (lua_State *L, void *block, int *size,
  51                                size_t size_elem, int limit,
  52                                const char *what);
  53
  54 #endif