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From: "trass3r at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug record/29260] New: Stopped event should contain reason for 'No
 more reverse-execution history'
Date: Fri, 17 Jun 2022 17:35:56 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29260

            Bug ID: 29260
           Summary: Stopped event should contain reason for 'No more
                    reverse-execution history'
           Product: gdb
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: record
          Assignee: unassigned at sourceware dot org
          Reporter: trass3r at gmail dot com
  Target Milestone: ---

When stepping past the reverse execution history buffer bounds
gdb prints 'No more reverse-execution history' to the output but does not g=
ive
a reason in the MI stopped event, leading to a bad UX.

https://github.com/microsoft/MIEngine/pull/1037#issuecomment-750299377
1: (62155) <-1057-exec-next --reverse
1: (62156) ->1057^running
1: (62156) ->*running,thread-id=3D"1"
1: (62156) ->(gdb)
1: (62163) ->~"\nNo more reverse-execution history.\n"
1: (62164) ->~"main (argc=3D1, argv=3D0x7fffffffdb78) at ../test.cpp:25\n"
1: (62164) ->~"25\t\tstd::u16string s =3D u\"test\";\n"
1: (62164)
->*stopped,frame=3D{addr=3D"0x000055555555734b",func=3D"main",args=3D[{name=
=3D"argc",value=3D"1"},{name=3D"argv",value=3D"0x7fffffffdb78"}],file=3D"..=
/test.cpp",fullname=3D"/tmp/test.cpp",line=3D"25",arch=3D"i386:x86-64"},thr=
ead-id=3D"1",stopped-threads=3D"all",core=3D"2"

Test case:
https://github.com/microsoft/MIEngine/pull/1037#issuecomment-1158743492
int main()
{
        int i =3D 0;
        ++i;
        ++i;
        return i;
}

$ gdb --batch -ex 'b main' -ex r -ex n -ex 'p i' -ex 'record full' -ex n -e=
x 'p
i' -ex n -ex 'p i' -ex n -ex 'p i' -ex 'reverse-next' -ex 'p i' -ex
'reverse-next' -ex 'p i' -ex 'reverse-next' -ex 'p i' test

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