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Re: [RFC/Patch v7] Debug methods using GDB Python

On Wed, Jan 22, 2014 at 1:36 PM, Siva Chandra <> wrote:
> Hi,
> Attached is the latest version of the patch which adds the debug
> methods feature to the GDB Python API. Changes from previous versions:
> 1. From the user point of view, the debug method API exposes a concept
> of a DebugMethodMatcher, and a DebugMethodWorker.  A
> DebugMethodMatcher matches class type and method name, and a
> DebugMethodWorker is the worker which actually invokes the debug
> method. A DebugMethodWorker also does arg type matching indirectly.
> Internally, GDB first calls the DebugMethodMatcher which returns all
> matching workers. Next, GDB picks a winner among these workers based
> on the arg types the workers return/serve. Finally, the winning worker
> is invoked. A matcher can manage a number of named workers which a
> user can enable/disable using the appropriate command.
> 2. Formatting cleanup. There could be other tabs vs space formatting
> issues still left, especially on the GDB side of the *.c changes. I am
> working on cleaning up the code changes in this part. I will fix the
> formatting issues along with it.
> 3. No docs yet as the actual Python API is not yet finalized.
> 2014-01-22  Siva Chandra Reddy  <>
>         * Add entries for new files.
>         * data-directory/ Add entries for new Python files.
>         * eval.c (evaluate_subexp_standard): Lookup and invoke methods
>         defined in extension languages.
>         * valarith.c (value_x_binop, value_x_unop): Lookup and invoke
>         overloaded operator methods defined in extension languages.
>         * valops.c (find_oload_method_list, find_method_list,
>         find_overload_match, find_oload_champ): Lookup methods defined
>         in extension languages.
>         (value_has_indirect_dynamic_type): New function to determine
>         the indirect dynamic type of a value.
>         * value.h (find_overload_match): Update signature.
>         * ext-function.c: New file.
>         * ext-function.h: New file.
>         * python/py-debugmethods.c: New file.
>         * python/py-objfile.c (objfile_object): New field
>         'debugmethod_matchers'.
>         (objfpy_dealloc): XDECREF on the new debugmethod_matcherss field.
>         (objfpy_new, objfile_to_objfile_object): Initialize
>         debugmethod_macthers field.
>         (objfpy_get_debugmethod_matchers): New function.
>         (objfile_getset): New entry 'debugmethod_matchers'.
>         * python/py-progspace.c (pspace_object): New field
>         'debugmethod_matchers'.
>         (pspy_dealloc): XDECREF on the new debugmethod_matchers field.
>         (pspy_new, pspace_to_pspace_object): Initialize
>         debugmethod_matchers field.
>         (pspy_get_debugmethod_matchers): New function.
>         (pspace_getset): New entry 'debug_methods'.
>         * python/python-internal.h: Add declarations for new functions.
>         * python/python.c (_initialize_python): Invoke
>         gdbpy_initialize_debugmethods.
>         * python/python.h: Add declarations of new functions.
>         * python/lib/gdb/ (debug_methods): New attribute.
>         * python/lib/gdb/ New file.
>         * python/lib/gdb/command/ New file.
>         testuite/
>         * gdb.python/ New testcase to test debug
>         methods.
>         * gdb.python/py-debugmethods.exp: New tests to test debug
>         methods.
>         * gdb.python/ Python script supporting the
>         new testcase and tests.

Hi.  Thanks for persevering.

I have some comments (nits, buglets, etc.) on the implementation, but
I'm happy with the overall approach.  I'll wait until you're ready
before sending a full review (since this is still a work in progress).


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