Bugs item #1333982, was opened at 2005-10-21 11:08
Message generated for change (Comment added) made by mwh
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Category: Parser/Compiler
Group: AST
Status: Open
Resolution: None
Priority: 5
Submitted By: Armin Rigo (arigo)
Assigned to: Nobody/Anonymous (nobody)
Summary: Bugs of the new AST compiler
Initial Comment:
The newly merged AST branch is likely to expose
a number of small problems before it stabilizes,
so here is a tentative bug tracker entry to
collect such small problems.
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>Comment By: Michael Hudson (mwh)
Date: 2005-12-11 00:41
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You have to include those lines in a source file. It still crashes for me.
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Comment By: Brett Cannon (bcannon)
Date: 2005-12-10 23:44
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I just checked Armin's problem code on rev. 41638 and it
worked for me in the interpreter. You still having
problems, Armin?
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Comment By: Armin Rigo (arigo)
Date: 2005-12-04 10:30
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At rev 41584, the following code snippet triggers an assert
if --with-pydebug is enabled:
Python/compile.c:3843: assemble_lnotab: Assertion 'd_lineno >= 0' failed
-----------------------
assert 1, ([s for s in x] +
[s for s in x])
pass
-----------------------
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Comment By: Neal Norwitz (nnorwitz)
Date: 2005-10-23 20:14
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Checkpoint of outstanding issues. I think all the others
mentioned so far have been fixed:
* Raymond's warnings in compile.c (unused locals are fixed)
* EXTENDED_ARG problem
* LOAD_CONST/POP_TOP (note we can fix this in the optimizer
generally which would get rid of other useless code too)
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Comment By: Raymond Hettinger (rhettinger)
Date: 2005-10-23 05:53
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FWIW, here are the warnings issued by my compiler:
Python-ast.c
C:\py25\Python\Python-ast.c(1995) : warning C4101: 'i' :
unreferenced local variable
C:\py25\Python\Python-ast.c(2070) : warning C4101: 'i' :
unreferenced local variable
C:\py25\Python\Python-ast.c(2085) : warning C4101: 'i' :
unreferenced local variable
C:\py25\Python\Python-ast.c(2130) : warning C4101: 'i' :
unreferenced local variable
C:\py25\Python\Python-ast.c(2151) : warning C4101: 'i' :
unreferenced local variable
C:\py25\Python\Python-ast.c(2261) : warning C4101: 'i' :
unreferenced local variable
C:\py25\Python\Python-ast.c(2270) : warning C4101: 'i' :
unreferenced local variable
compile.c
C:\py25\Python\compile.c(3782) : warning C4305: '=' : truncation
from 'const int ' to 'char '
C:\py25\Python\compile.c(3802) : warning C4305: '=' : truncation
from 'const int ' to 'char '
C:\py25\Python\compile.c(3806) : warning C4305: '=' : truncation
from 'const int ' to 'char '
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Comment By: Neal Norwitz (nnorwitz)
Date: 2005-10-22 08:28
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I assigned to Jeremy and Neil in the hopes they will see
this message and know about these problems.
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Comment By: Armin Rigo (arigo)
Date: 2005-10-21 13:45
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The following (similarly strange-looking) code snippets
compiled successfully before, now they give SyntaxErrors:
--------------------
def f():
class g:
exec "hi"
x
--------------------
def f(x):
class g:
exec "hi"
x
--------------------
def f():
class g:
from a import *
x
--------------------
def f(x):
class g:
from a import *
x
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Comment By: Armin Rigo (arigo)
Date: 2005-10-21 13:33
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I would suspect the following one to be due to incorrect
handling of EXTENDED_ARG -- it's from a PyPy test about that:
longexpr = 'x = x or ' + '-x' * 2500
code = '''
def f(x):
%s
%s
%s
%s
%s
%s
%s
%s
%s
%s
while x:
x -= 1
# EXTENDED_ARG/JUMP_ABSOLUTE here
return x
''' % ((longexpr,)*10)
exec code
f(5)
SystemError: unknown opcode
dis.dis() shows that the target of both the SETUP_LOOP and
the JUMP_IF_FALSE at the start of the loop are wrong.
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Comment By: Armin Rigo (arigo)
Date: 2005-10-21 13:15
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The Python rules about which names get mangled are a bit
insane. I share mwh's view that mangling should never have
been invented in the first place, but well:
>>> def f():
... __x = 5
... class X:
... def g(self):
... return __x
... return X
...
Fatal Python error: unknown scope for _X__x in X(135832776)
in <stdin>
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Comment By: Armin Rigo (arigo)
Date: 2005-10-21 13:01
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For reference, an optimization that got lost:
def f():
'a'
'b'
'a' is the docstring, but the 'b' previously did not show
up anywhere in the code object. Now there is the
LOAD_CONST/POP_TOP pair.
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Comment By: Armin Rigo (arigo)
Date: 2005-10-21 12:54
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any reason why lambda functions have a __name__ of
'lambda' now instead of '<lambda>' ?
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Comment By: Armin Rigo (arigo)
Date: 2005-10-21 11:22
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import a as b, c
the 'c' part gets completely forgotten and there is
no 'IMPORT_NAME c' in the bytecode.
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Comment By: Armin Rigo (arigo)
Date: 2005-10-21 11:13
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A scoping problem (comparing with the old compiler):
class X:
print hello
The variable 'hello' is incorrectly looked up with
LOAD_GLOBAL instead of LOAD_NAME. It causes a crash
in PyPy in a case where the name 'hello' is stored
into the class implicitely (via locals()). It can
probably be discussed if the bug is in PyPy, but it
is a difference in behavior.
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