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gh-123309: Remove check for redefined memo entry in pickletools.dis() #123374

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Merged
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Aug 31, 2024
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gh-123309: Remove check for redefined memo entry in pickletools.dis() #123374

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8 changes: 2 additions & 6 deletions Lib/pickletools.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2429,8 +2429,6 @@ def dis(pickle, out=None, memo=None, indentlevel=4, annotate=0):
+ A memo entry isn't referenced before it's defined.
+ The markobject isn't stored in the memo.
+ A memo entry isn't redefined.
"""

# Most of the hair here is for sanity checks, but most of it is needed
Expand Down Expand Up @@ -2484,7 +2482,7 @@ def dis(pickle, out=None, memo=None, indentlevel=4, annotate=0):
assert opcode.name == "POP"
numtopop = 0
else:
errormsg = markmsg = "no MARK exists on stack"
errormsg = "no MARK exists on stack"
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I removed this because:

  • this was the only case when the error message was also included in the output
  • all other comments in the output are enclosed in parentheses, so this one was outlier


# Check for correct memo usage.
if opcode.name in ("PUT", "BINPUT", "LONG_BINPUT", "MEMOIZE"):
Expand All @@ -2494,9 +2492,7 @@ def dis(pickle, out=None, memo=None, indentlevel=4, annotate=0):
else:
assert arg is not None
memo_idx = arg
if memo_idx in memo:
errormsg = "memo key %r already defined" % arg
elif not stack:
if not stack:
errormsg = "stack is empty -- can't store into memo"
elif stack[-1] is markobject:
errormsg = "can't store markobject in the memo"
Expand Down
26 changes: 8 additions & 18 deletions Lib/test/test_pickletools.py
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Original file line number Diff line number Diff line change
Expand Up @@ -206,7 +206,7 @@ def test_mark_without_pos(self):
def test_no_mark(self):
self.check_dis_error(b'Nt.', '''\
0: N NONE
1: t TUPLE no MARK exists on stack
1: t TUPLE
''', 'no MARK exists on stack')

def test_put(self):
Expand All @@ -221,26 +221,16 @@ def test_put(self):
''')

def test_put_redefined(self):
self.check_dis_error(b'Np1\np1\n.', '''\
self.check_dis(b'Np1\np1\nq\x01r\x01\x00\x00\x00\x94.', '''\
0: N NONE
1: p PUT 1
4: p PUT 1
''', 'memo key 1 already defined')
self.check_dis_error(b'Np1\nq\x01.', '''\
0: N NONE
1: p PUT 1
4: q BINPUT 1
''', 'memo key 1 already defined')
self.check_dis_error(b'Np1\nr\x01\x00\x00\x00.', '''\
0: N NONE
1: p PUT 1
4: r LONG_BINPUT 1
''', 'memo key 1 already defined')
self.check_dis_error(b'Np1\n\x94.', '''\
0: N NONE
1: p PUT 1
4: \\x94 MEMOIZE (as 1)
''', 'memo key None already defined')
7: q BINPUT 1
9: r LONG_BINPUT 1
14: \\x94 MEMOIZE (as 1)
15: . STOP
highest protocol among opcodes = 4
''')

def test_put_empty_stack(self):
self.check_dis_error(b'p0\n', '''\
Expand Down
1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2024-08-31-12-34-44.gh-issue-123374.3kE7rb.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Remove check for redefined memo entry in :func:`pickletools.dis`.
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