[ python-Bugs-1512814 ] Incorrect lineno's in code objects

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Bugs item #1512814, was opened at 2006-06-26 09:01
Message generated for change (Comment added) made by nnorwitz
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Category: Parser/Compiler
Group: Python 2.5
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: Thomas Wouters (twouters)
>Assigned to: Neal Norwitz (nnorwitz)
Summary: Incorrect lineno's in code objects

Initial Comment:
The 2.5 compiler forgets how to count linenumbers in
certain situations:

>>> s255 = "".join(["\n"] * 255 + ["spam"])
>>> s256 = "".join(["\n"] * 256 + ["spam"])

>>> exec s255
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<string>", line 256, in <module>
NameError: name 'spam' is not defined

>>> exec s256
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<string>", line 1, in <module>
NameError: name 'spam' is not defined

Notice the 'line 1' linenumber in the case of 256 blank
lines. The same happens for 'pass' statements or 'if 0'
blocks instead of blank lines. The problem is in the
actual code objects created:

>>> dis.disco(compile(s255, "", "exec"))
256           0 LOAD_NAME                0 (spam)
              3 POP_TOP             
              4 LOAD_CONST               0 (None)
              7 RETURN_VALUE        
>>> dis.disco(compile(s256, "", "exec"))
  1           0 LOAD_NAME                0 (spam)
              3 POP_TOP             
              4 LOAD_CONST               0 (None)
              7 RETURN_VALUE        



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>Comment By: Neal Norwitz (nnorwitz)
Date: 2006-07-09 17:04

Message:
Logged In: YES 
user_id=33168

Committed revision 50500.


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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1512814&group_id=5470