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List:       ltp-coverage
Subject:    Re: [Ltp-coverage] lcov line coverage
From:       Larry Martell <larry.martell () gmail ! com>
Date:       2009-09-18 22:13:59
Message-ID: 9ea8ae760909181513q4f011d11va1d7773eafdb728e () mail ! gmail ! com
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On Fri, Sep 18, 2009 at 2:08 PM, Osman, Ahmed <ahmed_osman@mentor.com> wrote:
> Hi ,
>
> I’m using LCOV to display our coverage data from gcov. When I inspect one of
> our files, I see the following:
>
>       78                 :
> /*-----------------------------------------------------------------------------
>
>       79                 :  COMMON NODE ROUTINES:
>
>       80                 :
> -----------------------------------------------------------------------------*/
>
>       81                 :
>
>       82                 : static int isFirstWriteToCh(WlfWrtChannel *ch,
> int archNum)
>
>       83               0 : {
>
>       84               0 :         WlfWrtChannelSend *chs = ch->send;
>
>       85       271945981 :     if (bitSetIsSet(&chs->trFirstWrite, archNum))
> {
>
>       86               0 :             return 0;
>
>       87                 :         } else {
>
>       88           35073 :             bitSetInsert(&chs->trFirstWrite,
> archNum);
>
>       89               0 :             return 1;
>
>       90                 :         }
>
>       91                 : }
>
> This is strange. The return statement at either line 86 or line 89 should be
> hit. Also, line 84 should be hit anyway. Please advice …

In all the times I have seen something like this it was because the
lines that did not get hit were optimized out. When I changed from -O3
down to -O1 or complied with no optimization at all, then the lines
got it. I know in your example, it does not seem like those lines
would have been optimized out, ya just nevah know. That optimizer is
pretty darn smart.

HTH
-larry
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