Yegappan wrote:
> When running Vim under valgrind, if the following Vim9 script
> is sourced:
>
> =================================
> vim9script
> def Func1(pat_arg: string)
> echo pat_arg
> enddef
> Func1('*.c')
> =================================
>
> The following traceback is reported:
>
> ==33841== Conditional jump or move depends on uninitialised value(s)
> ==33841== at 0x5D7E47: typval2type (vim9type.c:312)
> ==33841== by 0x5D874F: check_typval_type (vim9type.c:354)
> ==33841== by 0x5D2927: call_def_function (vim9execute.c:795)
> ==33841== by 0x5C3059: call_user_func (userfunc.c:1319)
> ==33841== by 0x5C36D3: call_user_func_check (userfunc.c:1711)
> ==33841== by 0x5C3B5F: call_func (userfunc.c:2179)
> ==33841== by 0x5C3FD2: get_func_tv (userfunc.c:690)
> ==33841== by 0x45198B: eval_func (eval.c:1900)
> ==33841== by 0x455F9A: eval7 (eval.c:3256)
> ==33841== by 0x456440: eval6 (eval.c:2895)
> ==33841== by 0x456440: eval5 (eval.c:2670)
> ==33841== by 0x4569BB: eval4 (eval.c:2532)
> ==33841== by 0x456FAE: eval3 (eval.c:2385)
> ==33841== by 0x456FAE: eval2 (eval.c:2251)
> ==33841== by 0x456FAE: eval1 (eval.c:2109)
>
> This is seen with Vim 8.2.1666.
I have noticed this in a few places. The problem is that often a
typval_T is passed to the evaluation functions and only v_type is
initialized. Or nothing at all. Then when accessing any of the fields,
possibly when evaluation failed or didn't set v_lock, a field is read
that wasn't initialized.
It might be the best to initialize rettv in eval0(). It might be a bit
of extra work in case evaluation fails, but that's not relevant.
--
Any sufficiently advanced technology is indistinguishable from magic.
Arthur C. Clarke
Any sufficiently advanced bug is indistinguishable from a feature.
Rich Kulawiec
/// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net \\\
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\\\ an exciting new programming language -- http://www.Zimbu.org ///
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