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"""
Weakref support in RPython. Basic regular weakrefs without callbacks
are supported. This file contains the following additions:
a form of WeakKeyDictionary, and a limited version of WeakValueDictionary.
"""
import weakref
from rpython.annotator.model import UnionError
# Basic regular weakrefs are supported in RPython.
# Note that if 'translation.rweakref' is False, they will
# still work, but be implemented as a strong reference.
# This case is useful for developing new GCs, for example.
ref = weakref.ref
def has_weakref_support():
return True # returns False if --no-translation-rweakref
class Dummy:
pass
dead_ref = weakref.ref(Dummy())
for i in range(5):
if dead_ref() is not None:
import gc; gc.collect()
assert dead_ref() is None # a known-to-be-dead weakref object
class RWeakValueDictionary(object):
"""A dictionary containing weak values."""
def __init__(self, keyclass, valueclass):
"""'keyclass' can be an RPython class or a type like 'int' or 'str'.
On the other hand, 'valueclass' must be an RPython class.
"""
self._dict = weakref.WeakValueDictionary()
self._keyclass = keyclass
self._valueclass = valueclass
def get(self, key):
assert isinstance(key, self._keyclass)
return self._dict.get(key, None)
def set(self, key, value):
assert isinstance(key, self._keyclass)
if value is None:
self._dict.pop(key, None)
else:
assert isinstance(value, self._valueclass)
self._dict[key] = value
class RWeakKeyDictionary(object):
"""A dictionary containing weak keys.
Keys and values must be instances.
Prebuilt RWeakKeyDictionaries must be empty.
"""
def __init__(self, keyclass, valueclass):
self._dict = weakref.WeakKeyDictionary()
self._keyclass = keyclass
self._valueclass = valueclass
def get(self, key):
"""Get the value associated to 'key', or None by default."""
assert isinstance(key, self._keyclass)
return self._dict.get(key, None)
def set(self, key, value):
"""Set the key/value pair (or delete it if value is None)."""
assert isinstance(key, self._keyclass)
if value is None:
self._dict.pop(key, None)
else:
assert isinstance(value, self._valueclass)
self._dict[key] = value
def length(self):
"""Mostly for debugging. Slow, don't use in real code."""
return len(self._dict)
# ____________________________________________________________
from rpython.rtyper import extregistry
from rpython.annotator import model as annmodel
from rpython.tool.pairtype import pairtype
class Entry(extregistry.ExtRegistryEntry):
_about_ = has_weakref_support
def compute_result_annotation(self):
translator = self.bookkeeper.annotator.translator
res = translator.config.translation.rweakref
return self.bookkeeper.immutablevalue(res)
def specialize_call(self, hop):
from rpython.rtyper.lltypesystem import lltype
hop.exception_cannot_occur()
return hop.inputconst(lltype.Bool, hop.s_result.const)
class SomeWeakValueDict(annmodel.SomeObject):
knowntype = RWeakValueDictionary
def __init__(self, s_key, valueclassdef):
self.s_key = s_key
self.valueclassdef = valueclassdef
def can_be_none(self):
return True
def noneify(self):
return self
def rtyper_makerepr(self, rtyper):
from rpython.rlib import _rweakvaldict
return _rweakvaldict.WeakValueDictRepr(rtyper,
rtyper.getrepr(self.s_key))
def rtyper_makekey(self):
return self.__class__, self.s_key.rtyper_makekey(), self.valueclassdef
def method_get(self, s_key):
return annmodel.SomeInstance(self.valueclassdef, can_be_None=True)
def method_set(self, s_key, s_value):
s_oldvalue = self.method_get(s_key)
assert s_oldvalue.contains(s_value)
class __extend__(pairtype(SomeWeakValueDict, SomeWeakValueDict)):
def union((s_wvd1, s_wvd2)):
if s_wvd1.valueclassdef is not s_wvd2.valueclassdef:
raise UnionError(s_wvd1, s_wvd2, "not the same class!")
s_key = annmodel.unionof(s_wvd1.s_key, s_wvd2.s_key)
return SomeWeakValueDict(s_key, s_wvd1.valueclassdef)
class Entry(extregistry.ExtRegistryEntry):
_about_ = RWeakValueDictionary
def compute_result_annotation(self, s_keyclass, s_valueclass):
assert s_keyclass.is_constant()
s_key = self.bookkeeper.valueoftype(s_keyclass.const)
return SomeWeakValueDict(
s_key,
_getclassdef(s_valueclass))
def specialize_call(self, hop):
from rpython.rlib import _rweakvaldict
return _rweakvaldict.specialize_make_weakdict(hop)
class Entry(extregistry.ExtRegistryEntry):
_type_ = RWeakValueDictionary
def compute_annotation(self):
bk = self.bookkeeper
x = self.instance
return SomeWeakValueDict(
bk.valueoftype(x._keyclass),
bk.getuniqueclassdef(x._valueclass))
def _getclassdef(s_instance):
assert isinstance(s_instance, annmodel.SomePBC)
assert s_instance.is_constant()
[desc] = s_instance.descriptions
return desc.getuniqueclassdef()
# ____________________________________________________________
class SomeWeakKeyDict(annmodel.SomeObject):
knowntype = RWeakKeyDictionary
def __init__(self, keyclassdef, valueclassdef):
self.keyclassdef = keyclassdef
self.valueclassdef = valueclassdef
def rtyper_makerepr(self, rtyper):
from rpython.rlib import _rweakkeydict
return _rweakkeydict.WeakKeyDictRepr(rtyper)
def rtyper_makekey(self):
return self.__class__, self.keyclassdef, self.valueclassdef
def method_get(self, s_key):
assert isinstance(s_key, annmodel.SomeInstance)
assert s_key.classdef.issubclass(self.keyclassdef)
return annmodel.SomeInstance(self.valueclassdef, can_be_None=True)
def method_set(self, s_key, s_value):
s_oldvalue = self.method_get(s_key)
assert s_oldvalue.contains(s_value)
def method_length(self):
return annmodel.SomeInteger(nonneg=True)
class __extend__(pairtype(SomeWeakKeyDict, SomeWeakKeyDict)):
def union((s_wkd1, s_wkd2)):
if s_wkd1.keyclassdef is not s_wkd2.keyclassdef:
raise UnionError(s_wkd1, s_wkd2, "not the same key class!")
if s_wkd1.valueclassdef is not s_wkd2.valueclassdef:
raise UnionError(s_wkd1, s_wkd2, "not the same value class!")
return SomeWeakKeyDict(s_wkd1.keyclassdef, s_wkd1.valueclassdef)
class Entry(extregistry.ExtRegistryEntry):
_about_ = RWeakKeyDictionary
def compute_result_annotation(self, s_keyclass, s_valueclass):
return SomeWeakKeyDict(_getclassdef(s_keyclass),
_getclassdef(s_valueclass))
def specialize_call(self, hop):
from rpython.rlib import _rweakkeydict
return _rweakkeydict.specialize_make_weakdict(hop)
class Entry(extregistry.ExtRegistryEntry):
_type_ = RWeakKeyDictionary
def compute_annotation(self):
bk = self.bookkeeper
x = self.instance
return SomeWeakKeyDict(bk.getuniqueclassdef(x._keyclass),
bk.getuniqueclassdef(x._valueclass))
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