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added check in 'obj2gco' to prevent its use in non Lua-object pointers

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(otherwise its cast is blind, casting any value given to it)
This commit is contained in:
Roberto Ierusalimschy 2018-02-25 09:43:52 -03:00
parent 4a7fe61806
commit f055a9dffd
1 changed files with 6 additions and 3 deletions
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9
lstate.h
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@ -1,5 +1,5 @@
/*
** $Id: lstate.h,v 2.155 2018/02/15 18:06:24 roberto Exp roberto $
** $Id: lstate.h,v 2.156 2018/02/17 19:29:29 roberto Exp roberto $
** Global State
** See Copyright Notice in lua.h
*/
@ -252,8 +252,11 @@ union GCUnion {
#define gco2upv(o) check_exp((o)->tt == LUA_TUPVAL, &((cast_u(o))->upv))
/* macro to convert a Lua object into a GCObject */
#define obj2gco(v) (&(cast_u(v)->gc))
/*
** macro to convert a Lua object into a GCObject
** (The access to 'tt' tries to ensure that 'v' is actually a Lua object.)
*/
#define obj2gco(v) check_exp((v)->tt >= LUA_TSTRING, &(cast_u(v)->gc))
/* actual number of total bytes allocated */