[Bug python/13326] New: Need support for C++ method call for a gdb.Value object from within python

[Bug python/13326] New: Need support for C++ method call for a gdb.Value object from within python

[lxmachine at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13326

             Bug #: 13326
           Summary: Need support for C++ method call for a gdb.Value
                    object from within python
           Product: gdb
           Version: 7.3
            Status: NEW
          Severity: normal
          Priority: P2
         Component: python
        AssignedTo: unassigned@sourceware.org
        ReportedBy: lxmachine@gmail.com
    Classification: Unclassified


The python scripting support is great.

There is support for function call if a gdb.Value object is of type
TYPE_CODE_FUNC.

There is no support for method call yet if a gdb.Value object is of type
TYPE_CODE_METHOD.

In order to support the pretty-pritters for some classes, sometimes we need to
call an method instead of just accessing some member fields.

Thanks,
Xun

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[Bug python/13326] Need support for C++ method call for a gdb.Value object from within python

[vmiklos at frugalware dot org]

http://sourceware.org/bugzilla/show_bug.cgi?id=13326

Miklos Vajna <vmiklos at frugalware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |vmiklos at frugalware dot
                   |                            |org

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[Bug python/13326] Need support for C++ method call for a gdb.Value object from within python

[tfogal at alumni dot unh.edu]

http://sourceware.org/bugzilla/show_bug.cgi?id=13326

tom fogal <tfogal at alumni dot unh.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tfogal at alumni dot
                   |                            |unh.edu

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[Bug python/13326] Need support for C++ method call for a gdb.Value object from within python

[malcolm.parsons at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=13326

Malcolm Parsons <malcolm.parsons at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |malcolm.parsons at gmail dot com

--- Comment #3 from Malcolm Parsons <malcolm.parsons at gmail dot com> ---
Use from a python pretty-printer is a bit convoluted, but it works:

def to_string(self):
    gdb.set_convenience_variable('_tmp', self.val.reference_value())
    return gdb.parse_and_eval('$_tmp.str()')

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[Bug python/13326] Need support for C++ method call for a gdb.Value object from within python

[jwakely.gcc at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=13326

Jonathan Wakely <jwakely.gcc at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jwakely.gcc at gmail dot com

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[Bug python/13326] Need support for C++ method call for a gdb.Value object from within python

[joelhock at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=13326

Joel Hock <joelhock at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |joelhock at gmail dot com

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[Bug python/13326] Need support for C++ method call for a gdb.Value object from within python

[ssbssa at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=13326

Hannes Domani <ssbssa at sourceware dot org> changed:

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

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[Bug python/13326] Need support for C++ method call for a gdb.Value object from within python

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=13326

--- Comment #4 from Sourceware Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Hannes Domani <ssbssa@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=2e08907d0672711617f71ef4604df190106b992e

commit 2e08907d0672711617f71ef4604df190106b992e
Author: Hannes Domani <ssbssa@yahoo.de>
Date:   Thu Feb 8 20:09:25 2024 +0100

    Allow calling of C++ methods from python

    Currently it's not possible to call C++ methods from python.
    Using this example:
    ```
    class B
    {
      static int static_func ();
      int arg0_func ();
      int arg1_func (int arg1);
      int arg2_func (int arg1, int arg2);
    };

    B *b_obj = new B;
    ```

    Trying to call B::static_func gives this error:
    ```
    (gdb) py b_obj = gdb.parse_and_eval('b_obj')
    (gdb) py print(b_obj['static_func']())
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
    RuntimeError: Value is not callable (not TYPE_CODE_FUNC).
    Error while executing Python code.
    ```

    TYPE_CODE_METHOD was simply missing as a possible type in
    valpy_call, now the same is possible:
    ```
    (gdb) py b_obj = gdb.parse_and_eval('b_obj')
    (gdb) py print(b_obj['static_func']())
    1111
    ```

    Note that it's necessary to explicitely add the this pointer
    as the first argument in a call of non-static methods:
    ```
    (gdb) py print(b_obj['arg0_func']())
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
    gdb.error: Too few arguments in function call.
    Error while executing Python code.
    (gdb) py print(b_obj['arg0_func'](b_obj))
    198
    ```

    Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=13326
    Approved-By: Tom Tromey <tom@tromey.com>

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[Bug python/13326] Need support for C++ method call for a gdb.Value object from within python

[ssbssa at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=13326

Hannes Domani <ssbssa at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |15.1
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #5 from Hannes Domani <ssbssa at sourceware dot org> ---
Fixed.

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[Bug python/13326] Need support for C++ method call for a gdb.Value object from within python

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=13326

--- Comment #6 from Sourceware Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Hannes Domani <ssbssa@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=f74da7b8b3d6f14ba9ad21b380f743e4bdc4e952

commit f74da7b8b3d6f14ba9ad21b380f743e4bdc4e952
Author: Hannes Domani <ssbssa@yahoo.de>
Date:   Mon Jun 3 17:18:30 2024 +0200

    Allow calling of convenience functions with python

    As mentioned in PR13326, currently when you try to call a
    convenience function with python, you get this error:

    (gdb) py print(gdb.convenience_variable("_isvoid")(3))
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
    RuntimeError: Value is not callable (not TYPE_CODE_FUNC or
TYPE_CODE_METHOD).
    Error while executing Python code.

    So this extends valpy_call to handle TYPE_CODE_INTERNAL_FUNCTION as
    well, making this possible:

    (gdb) py print(gdb.convenience_variable("_isvoid")(3))
    0

    Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=13326
    Approved-By: Tom Tromey <tom@tromey.com>

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[Bug python/13326] Need support for C++ method call for a gdb.Value object from within python

[ssbssa at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=13326

--- Comment #7 from Hannes Domani <ssbssa at sourceware dot org> ---
(In reply to vuvova from comment #1)
> Same for TYPE_CODE_INTERNAL_FUNCTION:
> 
> (gdb) pi a=gdb.parse_and_eval('$_streq')
> (gdb) pi print a.type.code == gdb.TYPE_CODE_INTERNAL_FUNCTION
> True
> (gdb) pi a("1","2")
> Python Exception <type 'exceptions.RuntimeError'> Value is not callable (not
> TYPE_CODE_FUNC).:

Now this is fixed as well.

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