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rclass.py
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rclass.py
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import types
from pypy.annotation import model as annmodel
#from pypy.annotation.classdef import isclassdef
from pypy.annotation import description
from pypy.rpython.error import TyperError
from pypy.rpython.rmodel import Repr, getgcflavor
def getclassrepr(rtyper, classdef):
try:
result = rtyper.class_reprs[classdef]
except KeyError:
result = rtyper.type_system.rclass.ClassRepr(rtyper, classdef)
rtyper.class_reprs[classdef] = result
rtyper.add_pendingsetup(result)
return result
def getinstancerepr(rtyper, classdef, default_flavor='gc'):
if classdef is None:
flavor = default_flavor
else:
flavor = getgcflavor(classdef)
try:
result = rtyper.instance_reprs[classdef, flavor]
except KeyError:
result = rtyper.type_system.rclass.buildinstancerepr(
rtyper, classdef, gcflavor=flavor)
rtyper.instance_reprs[classdef, flavor] = result
rtyper.add_pendingsetup(result)
return result
class MissingRTypeAttribute(TyperError):
pass
class AbstractClassRepr(Repr):
def __init__(self, rtyper, classdef):
self.rtyper = rtyper
self.classdef = classdef
def _setup_repr(self):
pass
def __repr__(self):
if self.classdef is None:
clsname = 'object'
else:
clsname = self.classdef.name
return '<ClassRepr for %s>' % (clsname,)
def compact_repr(self):
if self.classdef is None:
clsname = 'object'
else:
clsname = self.classdef.name
return 'ClassR %s' % (clsname,)
def convert_desc(self, desc):
subclassdef = desc.getuniqueclassdef()
if self.classdef is not None:
if self.classdef.commonbase(subclassdef) != self.classdef:
raise TyperError("not a subclass of %r: %r" % (
self.classdef.name, desc))
r_subclass = getclassrepr(self.rtyper, subclassdef)
return r_subclass.getruntime(self.lowleveltype)
def convert_const(self, value):
if not isinstance(value, (type, types.ClassType)):
raise TyperError("not a class: %r" % (value,))
bk = self.rtyper.annotator.bookkeeper
return self.convert_desc(bk.getdesc(value))
def prepare_method(self, s_value):
# special-casing for methods:
# if s_value is SomePBC([MethodDescs...])
# return a PBC representing the underlying functions
if isinstance(s_value, annmodel.SomePBC):
if not s_value.isNone() and s_value.getKind() == description.MethodDesc:
s_value = self.classdef.lookup_filter(s_value)
funcdescs = [mdesc.funcdesc for mdesc in s_value.descriptions]
return annmodel.SomePBC(funcdescs)
return None # not a method
def get_ll_eq_function(self):
return None
def get_type_repr(rtyper):
return getclassrepr(rtyper, None)
# ____________________________________________________________
class __extend__(annmodel.SomeInstance):
def rtyper_makerepr(self, rtyper):
return getinstancerepr(rtyper, self.classdef)
def rtyper_makekey(self):
return self.__class__, self.classdef
class AbstractInstanceRepr(Repr):
def __init__(self, rtyper, classdef):
self.rtyper = rtyper
self.classdef = classdef
def _setup_repr(self):
pass
def __repr__(self):
if self.classdef is None:
clsname = 'object'
else:
clsname = self.classdef.name
return '<InstanceRepr for %s>' % (clsname,)
def compact_repr(self):
if self.classdef is None:
clsname = 'object'
else:
clsname = self.classdef.name
return 'InstanceR %s' % (clsname,)
def _setup_repr_final(self):
pass
def new_instance(self, llops, classcallhop=None):
raise NotImplementedError
def convert_const(self, value):
if value is None:
return self.null_instance()
if isinstance(value, types.MethodType):
value = value.im_self # bound method -> instance
bk = self.rtyper.annotator.bookkeeper
try:
classdef = bk.getuniqueclassdef(value.__class__)
except KeyError:
raise TyperError("no classdef: %r" % (value.__class__,))
if classdef != self.classdef:
# if the class does not match exactly, check that 'value' is an
# instance of a subclass and delegate to that InstanceRepr
if classdef.commonbase(self.classdef) != self.classdef:
raise TyperError("not an instance of %r: %r" % (
self.classdef.name, value))
rinstance = getinstancerepr(self.rtyper, classdef)
result = rinstance.convert_const(value)
return self.upcast(result)
# common case
return self.convert_const_exact(value)
def convert_const_exact(self, value):
try:
return self.prebuiltinstances[id(value)][1]
except KeyError:
self.setup()
result = self.create_instance()
self.prebuiltinstances[id(value)] = value, result
self.initialize_prebuilt_instance(value, self.classdef, result)
return result
def get_reusable_prebuilt_instance(self):
"Get a dummy prebuilt instance. Multiple calls reuse the same one."
try:
return self._reusable_prebuilt_instance
except AttributeError:
self.setup()
result = self.create_instance()
self._reusable_prebuilt_instance = result
self.initialize_prebuilt_instance(Ellipsis, self.classdef, result)
return result
def initialize_prebuilt_instance(self, value, classdef, result):
# must fill in the _hash_cache_ field before the other ones
# (see test_circular_hash_initialization)
self.initialize_prebuilt_hash(value, result)
self.initialize_prebuilt_data(value, classdef, result)
def rtype_type(self, hop):
raise NotImplementedError
def rtype_getattr(self, hop):
raise NotImplementedError
def rtype_setattr(self, hop):
raise NotImplementedError
def rtype_is_true(self, hop):
raise NotImplementedError
def ll_str(self, i):
raise NotImplementedError
def get_ll_eq_function(self):
return None # defaults to compare by identity ('==' on pointers)
def can_ll_be_null(self, s_value):
return s_value.can_be_none()
# ____________________________________________________________
def rtype_new_instance(rtyper, classdef, llops, classcallhop=None):
rinstance = getinstancerepr(rtyper, classdef)
return rinstance.new_instance(llops, classcallhop)
_missing = object()
def fishllattr(inst, name, default=_missing):
from pypy.rpython.lltypesystem import lltype
from pypy.rpython.ootypesystem import ootype
if isinstance(inst, (ootype._instance, ootype._view)):
# XXX: we need to call ootypesystem.rclass.mangle, but we
# can't because we don't have a config object
mangled = 'o' + name
if default is _missing:
return getattr(inst, mangled)
else:
return getattr(inst, mangled, default)
else:
p = widest = lltype.normalizeptr(inst)
while True:
try:
return getattr(p, 'inst_' + name)
except AttributeError:
pass
try:
p = p.super
except AttributeError:
break
if default is _missing:
raise AttributeError("%s has no field %s" % (lltype.typeOf(widest),
name))
return default