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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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13
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 ** Interface to Memory Manager
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -14,9 +14,16 @@
#include "lua.h" #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) \ #define luaM_reallocv(L,b,on,n,e) \
((cast(size_t, (n)+1) > MAX_SIZET/(e)) ? /* +1 to avoid warnings */ \ (cast(void, \
(luaM_toobig(L), (void *)0) : \ (cast(size_t, (n)+1) > MAX_SIZET/(e)) ? (luaM_toobig(L), 0) : 0), \
luaM_realloc_(L, (b), (on)*(e), (n)*(e))) luaM_realloc_(L, (b), (on)*(e), (n)*(e)))
#define luaM_freemem(L, b, s) luaM_realloc_(L, (b), (s), 0) #define luaM_freemem(L, b, s) luaM_realloc_(L, (b), (s), 0)