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comparison lib/lua/lua-5.2.2/lmem.h @ 1866:41cc4dd3c122

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Lua 5.2.2 added.
author Nomad
date Wed, 16 Oct 2013 13:34:26 +0200
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1848:3b39b70e8e93 1866:41cc4dd3c122
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