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gh-58956: Set f_trace on frames with breakpoints after setting a new breakpoint #124454

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Merged
merged 5 commits into from
Oct 15, 2024
Merged

gh-58956: Set f_trace on frames with breakpoints after setting a new breakpoint #124454

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a7e07e5
Set f_trace on frames with breakpoints after setting a new breakpoint
gaogaotiantian Sep 24, 2024
bd72ec9
📜🤖 Added by blurb_it.
blurb-it[bot] Sep 24, 2024
5a32d94
Update 2024-09-24-18-16-59.gh-issue-58956.0wFrBR.rst
gaogaotiantian Oct 15, 2024
0cb7fe7
Update Misc/NEWS.d/next/Library/2024-09-24-18-16-59.gh-issue-58956.0w…
gaogaotiantian Oct 15, 2024
9007edf
Merge branch 'main' into fix-module-breakpoint
gaogaotiantian Oct 15, 2024
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8 changes: 8 additions & 0 deletions Lib/bdb.py
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Original file line number Diff line number Diff line change
Expand Up @@ -461,6 +461,14 @@ def set_break(self, filename, lineno, temporary=False, cond=None,
return 'Line %s:%d does not exist' % (filename, lineno)
self._add_to_breaks(filename, lineno)
bp = Breakpoint(filename, lineno, temporary, cond, funcname)
# After we set a new breakpoint, we need to search through all frames
# and set f_trace to trace_dispatch if there could be a breakpoint in
# that frame.
frame = self.enterframe
while frame:
if self.break_anywhere(frame):
frame.f_trace = self.trace_dispatch
frame = frame.f_back
return None

def _load_breaks(self):
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30 changes: 30 additions & 0 deletions Lib/test/test_pdb.py
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Expand Up @@ -3393,6 +3393,36 @@ def test_issue26053(self):
self.assertRegex(res, "Restarting .* with arguments:\na b c")
self.assertRegex(res, "Restarting .* with arguments:\nd e f")

def test_issue58956(self):
# Set a breakpoint in a function that already exists on the call stack
# should enable the trace function for the frame.
script = """
import bar
def foo():
ret = bar.bar()
pass
foo()
"""
commands = """
b bar.bar
c
b main.py:5
c
p ret
quit
"""
bar = """
def bar():
return 42
"""
with open('bar.py', 'w') as f:
f.write(textwrap.dedent(bar))
self.addCleanup(os_helper.unlink, 'bar.py')
stdout, stderr = self.run_pdb_script(script, commands)
lines = stdout.splitlines()
self.assertIn('-> pass', lines)
self.assertIn('(Pdb) 42', lines)

def test_step_into_botframe(self):
# gh-125422
# pdb should not be able to step into the botframe (bdb.py)
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2024-09-24-18-16-59.gh-issue-58956.0wFrBR.rst
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@@ -0,0 +1 @@
Fixed a bug in :mod:`pdb` where sometimes the breakpoint won't trigger if it was set on a function which is already in the call stack.
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