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bpo-32121: Add most_recent_first parameter to tracemalloc.Traceback.format (#4534)

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* Add most_recent_first parameter to tracemalloc.Traceback.format to allow
   reversing the order of the frames in the output
* Reversed default sorting of tracemalloc.Traceback frames
* Allowed negative limit, truncating from the other side.
This commit is contained in:
Jesse-Bakker 2017-11-30 00:05:07 +01:00 • committed by Victor Stinner
parent 859f7ce7a4
commit 706e10b186
7 changed files with 70 additions and 26 deletions
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26
Lib/tracemalloc.py
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@ -171,16 +171,18 @@ class Frame:
@total_ordering
class Traceback(Sequence):
"""
Sequence of Frame instances sorted from the most recent frame
to the oldest frame.
Sequence of Frame instances sorted from the oldest frame
to the most recent frame.
"""
__slots__ = ("_frames",)
def __init__(self, frames):
Sequence.__init__(self)
# frames is a tuple of frame tuples: see Frame constructor for the
# format of a frame tuple
self._frames = frames
# format of a frame tuple; it is reversed, because _tracemalloc
# returns frames sorted from most recent to oldest, but the
# Python API expects oldest to most recent
self._frames = tuple(reversed(frames))
def __len__(self):
return len(self._frames)
@ -209,11 +211,19 @@ class Traceback(Sequence):
def __repr__(self):
return "<Traceback %r>" % (tuple(self),)
def format(self, limit=None):
def format(self, limit=None, most_recent_first=False):
lines = []
if limit is not None and limit < 0:
return lines
for frame in self[:limit]:
if limit is not None:
if limit > 0:
frame_slice = self[-limit:]
else:
frame_slice = self[:limit]
else:
frame_slice = self
if most_recent_first:
frame_slice = reversed(frame_slice)
for frame in frame_slice:
lines.append(' File "%s", line %s'
% (frame.filename, frame.lineno))
line = linecache.getline(frame.filename, frame.lineno).strip()