Re: dofile("luac.out") segfaults

[Roberto Ierusalimschy <roberto@...>]

> About the bug: ldo.c:protectedparser _does_ calls the GC (early, just
> before compilation/undumping).  So the assumption in ldo.c:parse_file
> is wrong.
> --- ldo.c       Wed Apr 11 02:09:10 2001
> +++ ldo.c       Wed Apr 11 02:09:34 2001
> @@ -275,9 +275,9 @@
>    lua_pushstring(L, (filename == NULL) ? "(stdin)" : filename);
>    lua_concat(L, 2);
>    filename = lua_tostring(L, -1);  /* filename = '@'..filename */
> -  lua_pop(L, 1);  /* OK: there is no GC during parser */
>    luaZ_Fopen(&z, f, filename);
>    status = protectedparser(L, &z, bin);
> +  lua_pop(L, 1);  /* filename */
>    if (f != stdin)
>      fclose(f);
>    return status;

Actually, the assumption is wrong; but so is the fix. `protectedparser' 
leaves the compiled chunk on the stack, so pop will remove it, instead of 
removing the filename. (On the other hand, `protectedparser' will not leave 
a function on the stack in case of errors, so «lua_remove(L, -2)» don't
work, either.) 

-- Roberto