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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 | ||
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 |