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ba8b5c17 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
47LUAI_FUNC l_noret luaM_toobig (lua_State *L);
48
49/* not to be called directly */
50LUAI_FUNC void *luaM_realloc_ (lua_State *L, void *block, size_t oldsize,
51 size_t size);
52LUAI_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
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