Guido van Rossum wrote:
> I think we really *are* talking about the caller -- the caller owns
> the dict, if it managed to delete something from the dict before the
> callee can incref it, you'd have trouble. I don't immediately see how
> this could happen, which is probably why I left it as an XXX
> comment...
I found one way to call python code before the callee can incref the
args: the __eq__ between variable names and the dict entries. The
following snippet crashes the trunk version on win32:
class Name(str):
def __eq__(self, other):
del d[self]
return str.__eq__(self, other)
def __hash__(self):
return str.__hash__(self)
d = {Name("a"):1, Name("b"):2}
def f(a, b): print a,b
f(**d) # Segfault
There are several variants of this crasher; they all have more than
one keyword argument, and keywords strings must override __eq__ or
__hash__.
I could not find any other way to execute python code in this area.
--
Amaury Forgeot d'Arc
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