[Bug python/31467] New: gdb python api with_parameter doesn't work correctly for "breakpoint pending"

[Bug python/31467] New: gdb python api with_parameter doesn't work correctly for "breakpoint pending"

[mitch at runsafesecurity dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31467

            Bug ID: 31467
           Summary: gdb python api with_parameter doesn't work correctly
                    for "breakpoint pending"
           Product: gdb
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: mitch at runsafesecurity dot com
  Target Milestone: ---

Using `gdb.with_parameter` method with `breakpoint pending` fails and does not
restore original parameter value when original parameter is "auto".


```python
# foo.py
gdb.execute("show breakpoint pending")
print ("Old: ", gdb.parameter("breakpoint pending"))
with gdb.with_parameter("breakpoint pending", "on"):
    gdb.execute("show breakpoint pending")
    print ("New: ", gdb.parameter("breakpoint pending"))
```

```
(gdb) source foo.py
source foo.py
Debugger's behavior regarding pending breakpoints is auto.
Old:  None
Debugger's behavior regarding pending breakpoints is on.
New:  True
Traceback (most recent call last):
  File "foo.py", line 16, in <module>
    print ("New: ", gdb.parameter("breakpoint pending"))
  File "/usr/lib/python3.7/contextlib.py", line 119, in __exit__
    next(self.gen)
  File "/usr/local/share/gdb/python/gdb/__init__.py", line 263, in
with_parameter
    set_parameter(name, old_value)
  File "/usr/local/share/gdb/python/gdb/__init__.py", line 250, in
set_parameter
    execute("set " + name + " " + str(value), to_string=True)
gdb.error: "on", "off" or "auto" expected.
(gdb) source foo.py
source foo.py
Debugger's behavior regarding pending breakpoints is on.
Old:  True
Debugger's behavior regarding pending breakpoints is on.
New:  True
(gdb) 
```

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[Bug python/31467] gdb python api with_parameter doesn't work correctly for "breakpoint pending"

[mitch at runsafesecurity dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31467

Mitch Souders <mitch at runsafesecurity dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|unknown                     |14.1

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[Bug python/31467] gdb python api with_parameter doesn't work correctly for "breakpoint pending"

[ssbssa at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31467

Hannes Domani <ssbssa at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2024-03-09
                 CC|                            |ssbssa at sourceware dot org

--- Comment #1 from Hannes Domani <ssbssa at sourceware dot org> ---
gdb.parameter() returns for auto_boolean types 'None' if it's set to 'auto',
but gdb.set_parameter() thinks 'None' can only mean 'unlimited'.

Not sure how to fix this.

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[Bug python/31467] gdb python api with_parameter doesn't work correctly for "breakpoint pending"

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31467

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tromey at sourceware dot org

--- Comment #2 from Tom Tromey <tromey at sourceware dot org> ---
Vaguely related to bug#12188, where another case returns
something unexpected for auto.

Maybe the only fix is some API for looking up the underlying
"type" of a parameter so set_parameter can figure out
this is "auto boolean".

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[Bug python/31467] gdb python api with_parameter doesn't work correctly for "breakpoint pending"

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31467

--- Comment #3 from Tom Tromey <tromey at sourceware dot org> ---
Alternatively, for this particular case, a fix to bug#12816 would
seem to work.

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