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avoids warning with 'clang' + comment explaining macro

This commit is contained in:
Roberto Ierusalimschy 2012-11-14 15:21:34 -02:00
parent 52f9ccd298
commit f993771c70
1 changed files with 11 additions and 4 deletions
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15
lmem.h
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@ -1,5 +1,5 @@
/*
** $Id: lmem.h,v 1.37 2011/11/30 12:42:49 roberto Exp roberto $
** $Id: lmem.h,v 1.38 2011/12/02 13:26:54 roberto Exp $
** Interface to Memory Manager
** See Copyright Notice in lua.h
*/
@ -14,10 +14,17 @@
#include "lua.h"
/*
** This macro avoids the runtime division MAX_SIZET/(e), as 'e' is
** always constant.
** The macro is somewhat complex to avoid warnings:
** +1 avoids warnings of "comparsion has constant result";
** cast to 'void' avoids warnings of "value unused".
*/
#define luaM_reallocv(L,b,on,n,e) \
((cast(size_t, (n)+1) > MAX_SIZET/(e)) ? /* +1 to avoid warnings */ \
(luaM_toobig(L), (void *)0) : \
luaM_realloc_(L, (b), (on)*(e), (n)*(e)))
(cast(void, \
(cast(size_t, (n)+1) > MAX_SIZET/(e)) ? (luaM_toobig(L), 0) : 0), \
luaM_realloc_(L, (b), (on)*(e), (n)*(e)))
#define luaM_freemem(L, b, s) luaM_realloc_(L, (b), (s), 0)
#define luaM_free(L, b) luaM_realloc_(L, (b), sizeof(*(b)), 0)