Add the same _keep_alive patch (by Michael Scharff) that was added to

copy.deepcopy() a while ago.  Can't reproduce this but it doesn't
break anything and it looks like the code could have the same problem.
This commit is contained in:
Guido van Rossum 1997-09-03 00:23:54 +00:00
parent 15a40394b0
commit 5ed5c4c364

View File

@ -473,6 +473,7 @@ class Pickler:
if hasattr(object, '__getinitargs__'):
args = object.__getinitargs__()
len(args) # XXX Assert it's a sequence
_keep_alive(args, memo)
else:
args = ()
@ -501,6 +502,7 @@ class Pickler:
stuff = object.__dict__
else:
stuff = getstate()
_keep_alive(stuff, memo)
save(stuff)
write(BUILD)
dispatch[InstanceType] = save_inst
@ -523,6 +525,23 @@ class Pickler:
dispatch[BuiltinFunctionType] = save_global
def _keep_alive(x, memo):
"""Keeps a reference to the object x in the memo.
Because we remember objects by their id, we have
to assure that possibly temporary objects are kept
alive by referencing them.
We store a reference at the id of the memo, which should
normally not be used unless someone tries to deepcopy
the memo itself...
"""
try:
memo[id(memo)].append(x)
except KeyError:
# aha, this is the first one :-)
memo[id(memo)]=[x]
classmap = {}
def whichmodule(cls, clsname):