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Date: Tue, 19 May 2020 16:02:14 +0000 (UTC)
From: Hannes Domani <ssbssa@yahoo.de>
To: Gdb-patches <gdb-patches@sourceware.org>
Message-ID: <1207867761.770219.1589904134307@mail.yahoo.com>
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 <ab0d525f-4318-fc80-c0e6-225a95c778ea@linaro.org>
Subject: Re: [RFC][PATCH 0/6] Step program considering the source column
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 Am Dienstag, 19. Mai 2020, 14:27:44 MESZ hat Luis Machado <luis.machado@li=
naro.org> Folgendes geschrieben:

> Thanks for working on this, it is really useful.
>
> I'm guessing this series would probably handle the following situation
> very well:
>
> https://sourceware.org/bugzilla/show_bug.cgi?id=3D21221

According to the debug info, the i initialization is on line 5, column 23.
And the rest of the for-loop is on line 5, column 5.

With the new column-based next-command, it goes back and forth between
them (but you have to wait a while for the inner loop to finish).

Debug session:

(gdb) start
Temporary breakpoint 1 at 0x40162d: file gdb-21221.c, line 5, column 23.
Starting program: C:\src\tests\gdb-21221.exe

Temporary breakpoint 1, main () at gdb-21221.c:5
5=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 for (unsigned=
 int i =3D 0U; i < 0xFFFFFU; i++)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 ^
(gdb) nc
5=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 for (unsigned=
 int i =3D 0U; i < 0xFFFFFU; i++)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ^
(gdb) nc
5=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 for (unsigned=
 int i =3D 0U; i < 0xFFFFFU; i++)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0 ^
(gdb) nc
5=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 for (unsigned=
 int i =3D 0U; i < 0xFFFFFU; i++)
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ^
(gdb) l
1=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 int main (void)
2=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 {
3=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 while (1)
4=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 {
5=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 for (unsigned=
 int i =3D 0U; i < 0xFFFFFU; i++)
6=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 {
7=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ;
8=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 }
9=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 }
10=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 }
(gdb) disas
Dump of assembler code for function main:
=C2=A0=C2=A0 0x0000000000401620 <+0>:=C2=A0=C2=A0=C2=A0=C2=A0 push=C2=A0=C2=
=A0 %rbp
=C2=A0=C2=A0 0x0000000000401621 <+1>:=C2=A0=C2=A0=C2=A0=C2=A0 mov=C2=A0=C2=
=A0=C2=A0 %rsp,%rbp
=C2=A0=C2=A0 0x0000000000401624 <+4>:=C2=A0=C2=A0=C2=A0=C2=A0 sub=C2=A0=C2=
=A0=C2=A0 $0x30,%rsp
=C2=A0=C2=A0 0x0000000000401628 <+8>:=C2=A0=C2=A0=C2=A0=C2=A0 callq=C2=A0 0=
x401700 <__main>
=C2=A0=C2=A0 0x000000000040162d <+13>:=C2=A0=C2=A0=C2=A0 movl=C2=A0=C2=A0 $=
0x0,-0x4(%rbp)
=C2=A0=C2=A0 0x0000000000401634 <+20>:=C2=A0=C2=A0=C2=A0 jmp=C2=A0=C2=A0=C2=
=A0 0x40163a <main+26>
=C2=A0=C2=A0 0x0000000000401636 <+22>:=C2=A0=C2=A0=C2=A0 addl=C2=A0=C2=A0 $=
0x1,-0x4(%rbp)
=C2=A0=C2=A0 0x000000000040163a <+26>:=C2=A0=C2=A0=C2=A0 cmpl=C2=A0=C2=A0 $=
0xffffe,-0x4(%rbp)
=C2=A0=C2=A0 0x0000000000401641 <+33>:=C2=A0=C2=A0=C2=A0 jbe=C2=A0=C2=A0=C2=
=A0 0x401636 <main+22>
=C2=A0=C2=A0 0x0000000000401643 <+35>:=C2=A0=C2=A0=C2=A0 jmp=C2=A0=C2=A0=C2=
=A0 0x40162d <main+13>
End of assembler dump.
(gdb) maint info line-table gdb-21221.c
objfile: C:\src\tests\gdb-21221.exe ((struct objfile *) 0x11f4e670)
compunit_symtab: ((struct compunit_symtab *) 0x11f71890)
symtab: C:\src\tests\gdb-21221.c ((struct symtab *) 0x11f71910)
linetable: ((struct linetable *) 0x1204fde0):
INDEX=C2=A0 LINE=C2=A0=C2=A0 COLUMN ADDRESS=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 IS-STMT
0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 2=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 0x0000000000401620 Y
1=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 2=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 0x0000000000401628 Y
2=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 5=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 23=C2=A0=C2=
=A0=C2=A0=C2=A0 0x000000000040162d Y
3=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 5=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 5=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 0x0000000000401634 Y
4=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 END=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 0x0000000000401645 Y