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From: "gejoed at rediffmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug gcov-profile/100751] __gcov_dump and __gcov_reset usage
Date: Thu, 27 May 2021 13:53:29 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100751

--- Comment #13 from Gejoe <gejoed at rediffmail dot com> ---
I modified my sample-prog.c file just by adding a line of  __gcov_reset bef=
ore
the while loop.=20

However after a.out run , the sample-prog.c.gcov file was still showing the
counters though I didn't give 'g' for __gcov_dump invocation.

Quoting a portion from sample-prog.c.gcov file :

#####:    9:int main()
        -:   10:{
        -:   11:    unsigned char c;
        -:   12:    int result;
    #####:   13:    unsigned char data[]=3D{127,49,255,255};
    #####:   14:    c =3D '5';
        -:   15:=20
    #####:   16:    __gcov_reset();=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20
      <<<<<<<<Added here jin the original sample-prog.c file just to check =
the
reset behaviour
        -:   17:    do {
        -:   18:=20=20=20
        4:   19:        c =3D getchar();
        4:   20:        result =3D isalnum(c);
        4:   21:        printf("When %c is passed, return value is %d\n", c,
result);
        -:   22:=20
        4:   23:        if(c =3D=3D 'g')
        1:   24:            __gcov_dump();
        3:   25:        else if(c =3D=3D 'r')
    #####:   26:            __gcov_reset();
        -:   27:
        3:   28:    }while(c !=3D 'c');


I'm trying to now when would __gcov_reset help us in seeing the counter val=
ues
reset to ##### instead of old data(numbers like 4,1,3, etc in .c.gcov file).

Let me know if I miss any info.=