Re: Question for coverage report

From: Jacob Champion <jacob(dot)champion(at)enterprisedb(dot)com>
To: "Hayato Kuroda (Fujitsu)" <kuroda(dot)hayato(at)fujitsu(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Álvaro Herrera <alvherre(at)kurilemu(dot)de>, Steven Niu <niushiji(at)gmail(dot)com>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: Question for coverage report
Date: 2025-10-22 15:30:32
Message-ID: CAOYmi+=cHeYc91Ura_yYWPoeJZOm_Q5Tj+v_1xD0wBdH2+GdBA@mail.gmail.com
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On Tue, Oct 21, 2025 at 11:11 PM Hayato Kuroda (Fujitsu)
<kuroda(dot)hayato(at)fujitsu(dot)com> wrote:
> Per above, I could consider in pguotput.c., line 1495 was actually executed but
> 1503 was counted when it reached line 1494. Another question is why one of the
> branch was reported as 100% and another one was 0%. Is it just because counts
> was less than 1/100?

(I don't know the answer to this question, but I will note that clang
(15.0.7) does not seem to make this mistake on my machine, and reports
a call count of zero for the `return` on line 1495. Looking at the
disassembly, it seems to add more instrumentation points than what Tom
showed for gcc.)

--Jacob

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