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1866
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1 /*
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2 ** $Id: lmem.h,v 1.40 2013/02/20 14:08:21 roberto Exp $
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3 ** Interface to Memory Manager
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4 ** See Copyright Notice in lua.h
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5 */
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6
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7 #ifndef lmem_h
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8 #define lmem_h
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9
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10
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11 #include <stddef.h>
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12
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13 #include "llimits.h"
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14 #include "lua.h"
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15
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16
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17 /*
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18 ** This macro avoids the runtime division MAX_SIZET/(e), as 'e' is
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19 ** always constant.
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20 ** The macro is somewhat complex to avoid warnings:
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21 ** +1 avoids warnings of "comparison has constant result";
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22 ** cast to 'void' avoids warnings of "value unused".
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23 */
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24 #define luaM_reallocv(L,b,on,n,e) \
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25 (cast(void, \
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26 (cast(size_t, (n)+1) > MAX_SIZET/(e)) ? (luaM_toobig(L), 0) : 0), \
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27 luaM_realloc_(L, (b), (on)*(e), (n)*(e)))
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28
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29 #define luaM_freemem(L, b, s) luaM_realloc_(L, (b), (s), 0)
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30 #define luaM_free(L, b) luaM_realloc_(L, (b), sizeof(*(b)), 0)
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31 #define luaM_freearray(L, b, n) luaM_reallocv(L, (b), n, 0, sizeof((b)[0]))
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32
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33 #define luaM_malloc(L,s) luaM_realloc_(L, NULL, 0, (s))
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34 #define luaM_new(L,t) cast(t *, luaM_malloc(L, sizeof(t)))
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35 #define luaM_newvector(L,n,t) \
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36 cast(t *, luaM_reallocv(L, NULL, 0, n, sizeof(t)))
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37
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38 #define luaM_newobject(L,tag,s) luaM_realloc_(L, NULL, tag, (s))
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39
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40 #define luaM_growvector(L,v,nelems,size,t,limit,e) \
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41 if ((nelems)+1 > (size)) \
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42 ((v)=cast(t *, luaM_growaux_(L,v,&(size),sizeof(t),limit,e)))
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43
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44 #define luaM_reallocvector(L, v,oldn,n,t) \
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45 ((v)=cast(t *, luaM_reallocv(L, v, oldn, n, sizeof(t))))
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46
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47 LUAI_FUNC l_noret luaM_toobig (lua_State *L);
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48
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49 /* not to be called directly */
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50 LUAI_FUNC void *luaM_realloc_ (lua_State *L, void *block, size_t oldsize,
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51 size_t size);
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52 LUAI_FUNC void *luaM_growaux_ (lua_State *L, void *block, int *size,
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53 size_t size_elem, int limit,
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54 const char *what);
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55
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56 #endif
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57
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