Patches item #1642547, was opened at 2007-01-23 09:02
Message generated for change (Comment added) made by collinwinter
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Category: Core (C code)
Group: None
Status: Closed
Resolution: Accepted
Priority: 9
Private: No
Submitted By: Thomas Wouters (twouters)
Assigned to: Thomas Wouters (twouters)
Summary: Fix error/crash in AST: syntaxerror in complex ifs
Initial Comment:
Fix a bug in Python/ast.c, where a particular syntaxerror in an 'if' with one
or more 'elif's would be ignored or mishandled:
timberwolf:~/python/python/trunk > cat test2.py
def bug():
if w:
dir()=1
elif v:
pass
timberwolf:~/python/python/trunk > python2.4 test2.py
File "test2.py", line 3
dir()=1
SyntaxError: can't assign to function call
timberwolf:~/python/python/trunk > python2.5 test2.py
Exception exceptions.SyntaxError: ("can't assign to function call", 3) in
'garbage collection' ignored
Fatal Python error: unexpected exception during garbage collection
Aborted
The actual problem is the lack of error checks on the return values of
ast_for_expr() and ast_for_suite, in ast_for_if_stmt. Attached patch fixes.
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>Comment By: Collin Winter (collinwinter)
Date: 2007-03-16 00:20
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PEP 7's section on Py3k says 4-space indents, no tabs.
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Comment By: Neal Norwitz (nnorwitz)
Date: 2007-03-16 00:16
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It would be great to clean up the indentation in ast.c. I think I fixed
it (at least made it consistent) in compile.c. Probably symtable.c could
use it too. All the files that were new from the AST branch should be
cleaned up and use the proper formatting we are using for 3k. I don't
remember exactly what it is, but I think it's 4 space indents, but possibly
still using tabs.
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Comment By: Collin Winter (collinwinter)
Date: 2007-03-16 00:13
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Updated to apply against SVN HEAD and incorporated the additional error
checking Martin pointed out. Checked in as r54404 (trunk), r54405
(release25-maint).
Any objection to cleaning up ast.c's indentation? It's an ungodly mess.
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Comment By: Martin v. Löwis (loewis)
Date: 2007-02-14 04:46
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The patch looks fine to me, please apply (or let me know if you want me to
apply it).
I think there are a few other places where return values of ast_for_
aren't checked:
- ast_for_listcomp, not checking ast_for_expr results
- ast_for_withexpr, not checking context_expr
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