[Octave-bug-tracker] [bug #56020] dbup and dbdown not working as expected

[Guillaume]

URL:
  <https://savannah.gnu.org/bugs/?56020>

                 Summary: dbup and dbdown not working as expected
                 Project: GNU Octave
            Submitted by: gyom
            Submitted on: Thu 28 Mar 2019 10:19:12 AM UTC
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error
                  Status: None
             Assigned to: None
         Originator Name: Guillaume
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

In debugging mode, dbup and dbdown do not seem to work as expected. In this
example:


%%%%%%%% testdb.m %%%%%%%%
function testdb
  val = 0;
  a;
end

function a
  val = 1;
  b;
end

function b
  val = 2;
  keyboard;
end


Octave's behavior is:


octave> testdb
stopped in /opt/octave/testdb.m at line 13
13:   keyboard;
debug> dbstack
stopped in:

  --> testdb>b at line 13 [/opt/octave/testdb.m]
      testdb>a at line 8 [/opt/octave/testdb.m]
        testdb at line 3 [/opt/octave/testdb.m]
debug> dbup
stopped in testdb>b at line 13 [/opt/octave/testdb.m] 
debug> dbstack
stopped in:

  --> testdb>b at line 13 [/opt/octave/testdb.m]
      testdb>a at line 8 [/opt/octave/testdb.m]
        testdb at line 3 [/opt/octave/testdb.m]
debug> dbup
stopped in testdb>b at line 13 [/opt/octave/testdb.m] 
debug> dbup
stopped in testdb>b at line 13 [/opt/octave/testdb.m] 
debug> dbdown
error: dbdown: invalid stack frame
error: called from
    testdb>b at line 13 column 3
    testdb>a at line 8 column 3
    testdb at line 3 column 3


while in Matlab:


>> testdb 
K>> dbstack
> In testdb>b (line 13)
  In testdb>a (line 8)
  In testdb (line 3)
K>> dbup
In workspace belonging to testdb>a (line 8)
K>> dbstack
  In testdb>b (line 13)
> In testdb>a (line 8)
  In testdb (line 3)
K>> dbup   
In workspace belonging to testdb (line 3)
K>> dbstack
  In testdb>b (line 13)
  In testdb>a (line 8)
> In testdb (line 3)
K>> dbup   
In base workspace.
K>> dbup
In base workspace.
K>> dbstack
  In testdb>b (line 13)
  In testdb>a (line 8)
  In testdb (line 3)
K>> dbdown 
In workspace belonging to testdb (line 3)
K>> dbdown
In workspace belonging to testdb>a (line 8)
K>> dbdown
In workspace belonging to testdb>b (line 13)
K>> dbdown
In workspace belonging to testdb>b (line 13)





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