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# Ptwrite utilities.
# Copyright (C) 2023-2025 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""Utilities for working with ptwrite filters."""
import gdb
# _ptwrite_filter contains the per thread copies of the filter function.
# The keys are tuples of inferior id and thread id.
# The filter functions are created for each thread by calling the
# _ptwrite_filter_factory.
_ptwrite_filter = {}
_ptwrite_filter_factory = None
def _ptwrite_exit_handler(event):
"""Exit handler to prune _ptwrite_filter on thread exit."""
_ptwrite_filter.pop(event.inferior_thread.ptid, None)
gdb.events.thread_exited.connect(_ptwrite_exit_handler)
def _clear_traces():
"""Helper function to clear the trace of all threads."""
current_thread = gdb.selected_thread()
for inferior in gdb.inferiors():
for thread in inferior.threads():
thread.switch()
recording = gdb.current_recording()
if recording is not None:
recording.clear()
current_thread.switch()
def register_filter_factory(filter_factory_):
"""Register the ptwrite filter factory."""
if filter_factory_ is not None and not callable(filter_factory_):
raise TypeError("The filter factory must be callable or 'None'.")
# Clear the traces of all threads of all inferiors to force
# re-decoding with the new filter.
_clear_traces()
_ptwrite_filter.clear()
global _ptwrite_filter_factory
_ptwrite_filter_factory = filter_factory_
def get_filter():
"""Returns the filter of the current thread."""
thread = gdb.selected_thread()
key = thread.ptid
# Create a new filter for new threads.
if key not in _ptwrite_filter:
if _ptwrite_filter_factory is not None:
_ptwrite_filter[key] = _ptwrite_filter_factory(thread)
else:
return None
return _ptwrite_filter[key]
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