Home | History | Annotate | Download | only in src
      1 /*
      2 ** $Id: lmem.h,v 1.40 2013/02/20 14:08:21 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 <stddef.h>
     12 
     13 #include "llimits.h"
     14 #include "lua.h"
     15 
     16 
     17 /*
     18 ** This macro avoids the runtime division MAX_SIZET/(e), as 'e' is
     19 ** always constant.
     20 ** The macro is somewhat complex to avoid warnings:
     21 ** +1 avoids warnings of "comparison has constant result";
     22 ** cast to 'void' avoids warnings of "value unused".
     23 */
     24 #define luaM_reallocv(L,b,on,n,e) \
     25   (cast(void, \
     26      (cast(size_t, (n)+1) > MAX_SIZET/(e)) ? (luaM_toobig(L), 0) : 0), \
     27    luaM_realloc_(L, (b), (on)*(e), (n)*(e)))
     28 
     29 #define luaM_freemem(L, b, s)	luaM_realloc_(L, (b), (s), 0)
     30 #define luaM_free(L, b)		luaM_realloc_(L, (b), sizeof(*(b)), 0)
     31 #define luaM_freearray(L, b, n)   luaM_reallocv(L, (b), n, 0, sizeof((b)[0]))
     32 
     33 #define luaM_malloc(L,s)	luaM_realloc_(L, NULL, 0, (s))
     34 #define luaM_new(L,t)		cast(t *, luaM_malloc(L, sizeof(t)))
     35 #define luaM_newvector(L,n,t) \
     36 		cast(t *, luaM_reallocv(L, NULL, 0, n, sizeof(t)))
     37 
     38 #define luaM_newobject(L,tag,s)	luaM_realloc_(L, NULL, tag, (s))
     39 
     40 #define luaM_growvector(L,v,nelems,size,t,limit,e) \
     41           if ((nelems)+1 > (size)) \
     42             ((v)=cast(t *, luaM_growaux_(L,v,&(size),sizeof(t),limit,e)))
     43 
     44 #define luaM_reallocvector(L, v,oldn,n,t) \
     45    ((v)=cast(t *, luaM_reallocv(L, v, oldn, n, sizeof(t))))
     46 
     47 LUAI_FUNC l_noret luaM_toobig (lua_State *L);
     48 
     49 /* not to be called directly */
     50 LUAI_FUNC void *luaM_realloc_ (lua_State *L, void *block, size_t oldsize,
     51                                                           size_t size);
     52 LUAI_FUNC void *luaM_growaux_ (lua_State *L, void *block, int *size,
     53                                size_t size_elem, int limit,
     54                                const char *what);
     55 
     56 #endif
     57 
     58