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 58