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 <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