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deea250ab6
A recent discussion about what commands are allowed during
gdb.Breakpoint.stop, made me wonder if there would be less restrictions if
we'd do those commands as part of a breakpoint command list instead.
Attribute gdb.Breakpoint.commands is a string with gdb commands, so I
tried implementing a new class PyCommandsBreakpoint, derived from
gdb.Breakpoint, that supports a py_commands method.
My original idea was to forbid setting PyCommandsBreakpoint.commands, and do:
...
def py_commands(self):
print("VAR: %d" % self.var)
self.var += 1
gdb.execute("continue")
...
but as it turns out 'gdb.execute("continue")' does not behave the same way as
continue. I've filed PR python/32454 about this.
So the unsatisfactory solution is to first execute
PyCommandsBreakpoint.py_commands:
...
def py_commands(self):
print("VAR: %d" % self.var)
self.var += 1
...
and then:
...
self.commands = "continue"
...
I was hoping for a better outcome, but having done the work of writing this, I
suppose it has use as a test-case, perhaps also as an example of how to work
around PR python/32454.
Tested on x86_64-linux.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=32454
60 lines
1.8 KiB
Python
60 lines
1.8 KiB
Python
# Copyright (C) 2025 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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# This file is part of the GDB testsuite.
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import gdb
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class PyCommandsBreakpoint(gdb.Breakpoint):
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bp_dict = dict()
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def __init__(self, *args, **kwargs):
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gdb.Breakpoint.__init__(self, *args, **kwargs)
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PyCommandsBreakpoint.bp_dict[self.number] = self
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self.commands = ""
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@staticmethod
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def run_py_commands(num):
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bp = PyCommandsBreakpoint.bp_dict[num]
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if hasattr(bp, "py_commands"):
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bp.py_commands()
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def __setattr__(self, name, value):
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if name == "commands":
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l = ["python PyCommandsBreakpoint.run_py_commands(%d)" % self.number]
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if value != "":
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l.append(value)
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value = "\n".join(l)
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super().__setattr__(name, value)
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class TestBreakpoint(PyCommandsBreakpoint):
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def __init__(self):
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PyCommandsBreakpoint.__init__(self, spec="test")
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self.var = 1
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self.commands = "continue"
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self.silent = True
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def stop(self):
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if self.var == 3:
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self.commands = ""
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return True
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def py_commands(self):
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print("VAR: %d" % self.var)
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self.var += 1
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