Yukihiro Nakadaira wrote:
> When using %! item in 'statusline' option, Vim sometimes shows an error
> and sometimes crash.
>
> vimrc.vim:
> set statusline=%!MyStatusLine()
> set laststatus=2
> function MyStatusLine()
> return ""
> endfunction
>
> $ gvim -u vimrc.vim
> Error detected while processing function MyStatusLine:
> E121: Undefined variable: MyStatusLine
> Error detected while processing function MyStatusLine:
> E15: Invalid expression: MyStatusLine
> E15: Invalid expression: ~W^Iá3~L (message is random text)
>
> I am using GTK2 GUI. I saw the error at startup and when using
> scrollbar.
>
> The error can be reproduced by using :redraw! command in MyStatusLine().
>
> function MyStatusLine()
> redraw!
> return ""
> endfunction
>
>
> It seems that:
>
> 1. build_stl_str_hl()
> w_p_stl is "%!MyStatusLine()".
>
> 2. eval_to_string()
> Evaluate "MyStatusLine()".
>
> 3. call_func()
> 8021 cc = name[len];
> 8022 name[len] = NUL;
> At this time, name == w_p_stl + 2.
> Then w_p_stl is changed from "%!MyStatusLine()" to "%!MyStatusLine"
>
> 4. call_user_func()
> In this function, line_breakcheck() is invoked. Then Vim processes
> the GUI event loop. If there is an event which is cause of drawing,
> Vim draws statusline again.
>
> 5. build_stl_str_hl()
> At this time, w_p_stl is "%!MyStatusLine" by 3. call_func().
>
> 6. eval_to_string()
> Evaluate "MyStatusLine"
>
> 7. get_var_tv()
> Echo error "E121: Undefined variable: MyStatusLine"
>
> 8. eval0()
> Echo error "E15: Invalid expression: MyStatusLine"
>
> 9. redraw_custum_statusline()
> 5907 if (called_emsg)
> 5908 set_string_option_direct((char_u *)"statusline", -1,
> 5909 (char_u *)"", OPT_FREE | (*wp->w_p_stl != NUL
> 5910 ? OPT_LOCAL :
> OPT_GLOBAL), SID_ERROR);
> Since error is raised, w_p_stl is freed.
>
> (back to first statusline drawing)
>
> 10. eval0()
> 3924 if (!aborting())
> 3925 EMSG2(_(e_invexpr2), arg);
> Echo error "E15: Invalid expression: ~W^Iá3~L"
> At this time, arg == w_p_stl + 2.
> And w_p_stl is already freed.
I can't reproduce it right away, but your explanation shows what is
wrong. I'll add it to the todo list.
--
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