derek.holloway
7502bf64a4
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71 lines
2.5 KiB
Python
71 lines
2.5 KiB
Python
# Copyright (C) 2024 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import gdb
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from gdb.unwinder import FrameId, Unwinder
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# Cached FrameId. See set_break_bt_here_frame_id for details.
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break_bt_here_frame_id = None
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def set_break_bt_here_frame_id(pc, cfa):
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"""Call this to pre-calculate the FrameId for the frame our unwinder
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is going to claim, this avoids us having to actually figure out a
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frame-id within the unwinder, something which is going to be hard
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to do in a cross-target way.
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Instead we first run the test without the Python unwinder in
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place, use 'maint print frame-id' to record the frame-id, then,
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after loading this Python script, we all this function to record
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the frame-id that the unwinder should use."""
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global break_bt_here_frame_id
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break_bt_here_frame_id = FrameId(cfa, pc)
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class break_unwinding(Unwinder):
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"""An unwinder for the function 'break_bt_here'. This unwinder will
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claim any frame for the function in question, but doesn't provide
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any unwound register values. Importantly, we don't provide a
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previous $pc value, this means that if we are stopped in
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'break_bt_here' then we should fail to unwind beyond frame #0."""
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def __init__(self):
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Unwinder.__init__(self, "break unwinding")
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def __call__(self, pending_frame):
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pc_desc = pending_frame.architecture().registers().find("pc")
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pc = pending_frame.read_register(pc_desc)
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if pc.is_optimized_out:
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return None
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block = gdb.block_for_pc(pc)
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if block == None:
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return None
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func = block.function
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if func == None:
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return None
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if str(func) != "break_bt_here":
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return None
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global break_bt_here_frame_id
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if break_bt_here_frame_id is None:
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return None
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return pending_frame.create_unwind_info(break_bt_here_frame_id)
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gdb.unwinder.register_unwinder(None, break_unwinding(), True)
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