| 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 | |