pypy / pypy / objspace / std / typeobject.py

Benjamin Peterso… 7e2f9bc 

Armin Rigo 6a00154 
Samuele Pedroni 6d0f153 
Armin Rigo 1641ad7 
Armin Rigo 32a7117 
Carl Friedrich B… e745c25 
Samuele Pedroni b42e2f5 
Armin Rigo 6a00154 
Antonio Cuni 0bba35b 
Carl Friedrich B… 9de9519 
Armin Rigo 247acb2 
Maciej Fijalkows… 1cd384c 

Carl Friedrich B… 382f399 
Armin Rigo 6303969 
Armin Rigo 6a00154 
Carl Friedrich B… e745c25 









Samuele Pedroni d3d217c 




















Armin Rigo 579be52 




Samuele Pedroni d3d217c 


Carl Friedrich B… 29d3dd7 


Benjamin Peterso… df1d9e1 











Armin Rigo 3f8606e 








Alex Gaynor e28ade0 
Antonio Cuni f99a873 


Benjamin Peterso… df1d9e1 
Armin Rigo 32a7117 
Armin Rigo 6a00154 

Samuele Pedroni 5c4a706 
Carl Friedrich B… 6985c2a 



Maciej Fijalkows… b5a2e0b 
Armin Rigo bd3c564 

Armin Rigo 98ad343 
Maciej Fijalkows… f76f1ff 

Carl Friedrich B… dfc9264 
Carl Friedrich B… a0d6198 
Antonio Cuni 1728bcd 

Armin Rigo 426be91 
Alex Gaynor e5ef850 
Alex Gaynor 706037d 
Antonio Cuni 1728bcd 
Benjamin Peterso… 24e0e26 
Samuele Pedroni fe0b913 

Maciej Fijalkows… b5a2e0b 
Samuele Pedroni fe0b913 
Antonio Cuni deabe6d 
Antonio Cuni f99a873 
Antonio Cuni a2ad836 
Armin Rigo 66ca6d9 

holger krekel 0e83ec0 
Armin Rigo bd3c564 
Armin Rigo 6a00154 
Samuele Pedroni 803049b 
Armin Rigo fca0236 
Armin Rigo 6a00154 


Samuele Pedroni b42e2f5 
Maciej Fijalkows… b5a2e0b 
Carl Friedrich B… c909fb0 
Maciej Fijalkows… b5a2e0b 
Benjamin Peterso… 825751b 
Armin Rigo 071e976 
Armin Rigo bd3c564 


Maciej Fijalkows… b5a2e0b 
Armin Rigo b2f8da9 
Armin Rigo 6a00154 
Maciej Fijalkows… b5a2e0b 
Armin Rigo 6a00154 
Maciej Fijalkows… b5a2e0b 
Armin Rigo 776190a 
Samuele Pedroni 8fb3165 
Carl Friedrich B… 29d3dd7 
Carl Friedrich B… 85a67c7 
Maciej Fijalkows… b5a2e0b 
Carl Friedrich B… dc6e10f 
Carl Friedrich B… 26accfe 


Carl Friedrich B… 6985c2a 
Antonio Cuni 1728bcd 





Carl Friedrich B… 29d3dd7 
Antonio Cuni 923f2db 





Carl Friedrich B… 29d3dd7 
Alex Gaynor 2db51ef 
Samuele Pedroni 55b26c4 
Samuele Pedroni fe0b913 
Antonio Cuni deabe6d 
Samuele Pedroni fe0b913 
Samuele Pedroni 55b26c4 

Maciej Fijalkows… b5a2e0b 


Samuele Pedroni 55b26c4 
Antonio Cuni deabe6d 
Antonio Cuni f99a873 


Antonio Cuni 76c609d 
Samuele Pedroni fe0b913 
Armin Rigo 66ca6d9 
Samuele Pedroni fe0b913 
Samuele Pedroni 55b26c4 
Carl Friedrich B… 6985c2a 

Samuele Pedroni 55b26c4 



Antonio Cuni 923f2db 
Armin Rigo 6a00154 
Carl Friedrich B… 6985c2a 
Alex Gaynor 2db51ef 
Carl Friedrich B… 6985c2a 
Armin Rigo cdd41d6 
Carl Friedrich B… 6985c2a 

Carl Friedrich B… 382f399 
Carl Friedrich B… a6e2dc3 


Carl Friedrich B… 6985c2a 

























Antonio Cuni a2ad836 
Antonio Cuni bb9c6a2 
Antonio Cuni deabe6d 
Antonio Cuni a2ad836 

Antonio Cuni f99a873 


Antonio Cuni a2ad836 

Antonio Cuni bb9c6a2 


Antonio Cuni f99a873 






Antonio Cuni a2ad836 
Michael Hudson-D… a826360 





Armin Rigo 1e8a38c 

Maciej Fijalkows… b5a2e0b 
Armin Rigo 1e8a38c 

Maciej Fijalkows… b5a2e0b 
Samuele Pedroni d13ca7a 
Armin Rigo 6a00154 
Amaury Forgeot d… 0bf8e32 
Carl Friedrich B… e745c25 










Samuele Pedroni 3fadbcf 


Armin Rigo 2515533 

Samuele Pedroni 3fadbcf 







holger krekel 0e83ec0 
Carl Friedrich B… 382f399 
Carl Friedrich B… e745c25 


Lukas Diekmann 1a99cd9 
Alex Gaynor 2db51ef 
Lukas Diekmann 1a99cd9 




Carl Friedrich B… e745c25 









Antonio Cuni 923f2db 
Lukas Diekmann 1a99cd9 


Armin Rigo 24ff93f 
Lukas Diekmann 1a99cd9 
Maciej Fijalkows… c4813b2 
Alex Gaynor 2db51ef 
Lukas Diekmann 1a99cd9 






Antonio Cuni 923f2db 
Lukas Diekmann 1a99cd9 

Carl Friedrich B… a1e03d9 
Armin Rigo 6a00154 

Carl Friedrich B… a1e03d9 











Alex Gaynor d7300e6 
Maciej Fijalkows… 9b082b4 






Amaury Forgeot d… 0bf8e32 
Maciej Fijalkows… 9b082b4 


Alex Gaynor e28ade0 
Maciej Fijalkows… 54ef304 
Carl Friedrich B… a1e03d9 

Armin Rigo 6a00154 
Amaury Forgeot d… 0bf8e32 
holger krekel 0e83ec0 

Armin Rigo 6a00154 

Maciej Fijalkows… 54ef304 
Carl Friedrich B… a1e03d9 
Armin Rigo 6a00154 



Amaury Forgeot d… 0bf8e32 
holger krekel 0e83ec0 

Armin Rigo 6a00154 

Armin Rigo 27a8b47 






Carl Friedrich B… e745c25 
Armin Rigo 27a8b47 



Carl Friedrich B… a1e03d9 

Carl Friedrich B… b1ffa11 
Carl Friedrich B… a1e03d9 
Carl Friedrich B… b1ffa11 
Carl Friedrich B… a1e03d9 


Maciej Fijalkows… 1cd384c 
Carl Friedrich B… e745c25 

Carl Friedrich B… 231a0da 
Carl Friedrich B… 382f399 
Carl Friedrich B… 231a0da 

Benjamin Peterso… df1d9e1 
Armin Rigo 2d21f86 

Armin Rigo 46d1d91 






Armin Rigo 247acb2 
Armin Rigo 2d21f86 





Benjamin Peterso… df1d9e1 
Carl Friedrich B… a1e03d9 
Benjamin Peterso… df1d9e1 
Armin Rigo 68abf17 
Benjamin Peterso… df1d9e1 
Carl Friedrich B… a1e03d9 
Benjamin Peterso… df1d9e1 
Carl Friedrich B… a1e03d9 

Armin Rigo 27a8b47 
Benjamin Peterso… df1d9e1 


Carl Friedrich B… a1e03d9 
Benjamin Peterso… df1d9e1 
Carl Friedrich B… a1e03d9 


Armin Rigo 6a00154 

Samuele Pedroni b50d501 
Armin Rigo 1641ad7 

Armin Rigo 815cd34 
Benjamin Peterso… c45012a 
Armin Rigo 1641ad7 


Armin Rigo 6a00154 
Armin Rigo 1641ad7 


Samuele Pedroni b50d501 
Armin Rigo 6a00154 
Maciej Fijalkows… c4813b2 
Armin Rigo de154a6 


Amaury Forgeot d… 0bf8e32 
Armin Rigo de154a6 

Amaury Forgeot d… a79459e 
Carl Friedrich B… 50dcad7 

holger krekel 0e83ec0 
Maciej Fijalkows… c4813b2 
Carl Friedrich B… 50dcad7 
Carl Friedrich B… 1e89bd5 
Carl Friedrich B… 50dcad7 
Armin Rigo 6a00154 
Michael Hudson-D… de06f13 
Samuele Pedroni ca4b87c 

Armin Rigo 6a00154 
Samuele Pedroni 417e80d 
Armin Rigo bd3c564 
Samuele Pedroni ca4b87c 
holger krekel e215860 
Armin Rigo bd3c564 
holger krekel e215860 
Benjamin Peterso… d7e213d 
Armin Rigo bd3c564 
Benjamin Peterso… d7e213d 

Armin Rigo bd3c564 
Benjamin Peterso… d7e213d 
Benjamin Peterso… c45012a 
Carl Friedrich B… b1ffa11 

Benjamin Peterso… c45012a 







Samuele Pedroni 166011f 

Armin Rigo 4e21df7 
Lukas Diekmann ab926f8 
Samuele Pedroni 166011f 
Armin Rigo 4e21df7 
Armin Rigo d181d18 


Justin Peel c5fd944 

Lukas Diekmann ab926f8 
Samuele Pedroni 166011f 
Armin Rigo 32a7117 
Armin Rigo 905a25d 


Justin Peel c5fd944 
Armin Rigo 905a25d 







Michael Hudson-D… a826360 

Armin Rigo 071e976 








Michael Hudson-D… a826360 

Armin Rigo 071e976 
Michael Hudson-D… a826360 
Michael Hudson-D… f2ed710 

Armin Rigo 071e976 





Michael Hudson-D… f2ed710 

Carl Friedrich B… 29d3dd7 

Armin Rigo 071e976 


Armin Rigo 9436f4d 

Carl Friedrich B… 29d3dd7 
Armin Rigo 071e976 


Carl Friedrich B… 29d3dd7 



Armin Rigo 32a7117 





Armin Rigo 6b50cfc 

Armin Rigo 32a7117 
Maciej Fijalkows… b5a2e0b 






























































Armin Rigo 1641ad7 



Maciej Fijalkows… b5a2e0b 

































Alex Gaynor fa27ac6 

Maciej Fijalkows… b5a2e0b 






























Carl Friedrich B… 20bae39 
Carl Friedrich B… 4fd99df 

Carl Friedrich B… 20bae39 



Maciej Fijalkows… b5a2e0b 


Armin Rigo 853fe8d 

Maciej Fijalkows… b5a2e0b 



Armin Rigo 853fe8d 

Maciej Fijalkows… b5a2e0b 














Armin Rigo bd3c564 
Jason Creighton d6c5469 


Armin Rigo bd3c564 

Maciej Fijalkows… b5a2e0b 








Benjamin Peterso… 825751b 
Maciej Fijalkows… b5a2e0b 



Benjamin Peterso… 825751b 
Maciej Fijalkows… b5a2e0b 
















Benjamin Peterso… 0f46d7a 

Armin Rigo 2c9411f 



Maciej Fijalkows… b5a2e0b 





Benjamin Peterso… 99a94a4 
Maciej Fijalkows… b5a2e0b 

Armin Rigo 8e5d92f 
Armin Rigo a0da934 
Maciej Fijalkows… b5a2e0b 


Armin Rigo a0da934 









Armin Rigo 27a8b47 





Maciej Fijalkows… b5a2e0b 
Samuele Pedroni 166011f 
Samuele Pedroni ca4b87c 
Carl Friedrich B… b1ffa11 
Armin Rigo 6a00154 
Carl Friedrich B… 6985c2a 
Armin Rigo 66ca6d9 


Carl Friedrich B… 6985c2a 

Armin Rigo 66ca6d9 
Carl Friedrich B… 6985c2a 
Armin Rigo 66ca6d9 

Samuele Pedroni fe0b913 


Carl Friedrich B… 6985c2a 
Armin Rigo 66ca6d9 



Armin Rigo 1946e86 
Armin Rigo 6a00154 
Alex Gaynor e28ade0 

Armin Rigo 6a00154 
Michael Hudson-D… ab606eb 
Armin Rigo 720424f 


Armin Rigo 6a00154 

Benjamin Peterso… c45012a 

Carl Friedrich B… dfc9264 
Carl Friedrich B… 382f399 
Benjamin Peterso… c45012a 

Carl Friedrich B… dfc9264 
Maciej Fijalkows… d0e6e3e 





Armin Rigo 6a00154 
Samuele Pedroni 166011f 
Justin Peel c5fd944 
Samuele Pedroni 166011f 


Armin Rigo 273ee4e 
Samuele Pedroni 47eec35 

Samuele Pedroni 166011f 




Armin Rigo 6a00154 





Benjamin Peterso… 97f42f4 



Armin Rigo 6a00154 





Armin Rigo 1641ad7 


Armin Rigo 6a00154 
Amaury Forgeot d… 4d5e592 


Armin Rigo 6a00154 

Samuele Pedroni 6d0f153 
Christian Tismer ced7cfd 
Christian Tismer 5fed469 
holger krekel 3b9086f 
Armin Rigo 4024b49 








holger krekel 3b9086f 
Christian Tismer 2e4e2ed 
Samuele Pedroni 6d0f153 








Armin Rigo 6a00154 
Samuele Pedroni 6d0f153 
Armin Rigo 6a00154 



Carl Friedrich B… 42ce7eb 
Armin Rigo 6a00154 

Samuele Pedroni 8c3226c 
Armin Rigo 6a00154 


Carl Friedrich B… 42ce7eb 
Armin Rigo 6a00154 




Samuele Pedroni 453992f 
Armin Rigo 6a00154 



Carl Friedrich B… 42ce7eb 
Armin Rigo 6a00154 
Samuele Pedroni 8c3226c 
Armin Rigo 6a00154 



Armin Rigo 1641ad7 

Armin Rigo 815cd34 
Armin Rigo 6a00154 






Armin Rigo 815cd34 
Armin Rigo 6a00154 




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from pypy.objspace.std.model import W_Object
from pypy.objspace.std.register_all import register_all
from pypy.interpreter.function import Function, StaticMethod
from pypy.interpreter import gateway
from pypy.interpreter.error import OperationError, operationerrfmt
from pypy.interpreter.typedef import weakref_descr
from pypy.interpreter.baseobjspace import W_Root
from pypy.objspace.std.stdtypedef import std_dict_descr, issubtypedef, Member
from pypy.objspace.std.objecttype import object_typedef
from pypy.objspace.std import identitydict
from pypy.rlib.objectmodel import we_are_translated
from pypy.rlib.objectmodel import current_object_addr_as_int, compute_hash
from pypy.rlib.jit import promote, elidable_promote, we_are_jitted,\
     promote_string
from pypy.rlib.jit import elidable, dont_look_inside, unroll_safe
from pypy.rlib.rarithmetic import intmask, r_uint

class TypeCell(W_Root):
    def __init__(self, w_value=None):
        self.w_value = w_value

def unwrap_cell(space, w_value):
    if (space.config.objspace.std.withtypeversion and
            isinstance(w_value, TypeCell)):
        return w_value.w_value
    return w_value

# from compiler/misc.py

MANGLE_LEN = 256 # magic constant from compile.c

def _mangle(name, klass):
    if not name.startswith('__'):
        return name
    if len(name) + 2 >= MANGLE_LEN:
        return name
    if name.endswith('__'):
        return name
    try:
        i = 0
        while klass[i] == '_':
            i = i + 1
    except IndexError:
        return name
    klass = klass[i:]

    tlen = len(klass) + len(name)
    if tlen > MANGLE_LEN:
        end = len(klass) + MANGLE_LEN-tlen
        if end < 0:
            klass = ''     # annotator hint
        else:
            klass = klass[:end]

    return "_%s%s" % (klass, name)

class VersionTag(object):
    pass

class MethodCache(object):

    def __init__(self, space):
        assert space.config.objspace.std.withmethodcache
        SIZE = 1 << space.config.objspace.std.methodcachesizeexp
        self.versions = [None] * SIZE
        self.names = [None] * SIZE
        self.lookup_where = [(None, None)] * SIZE
        if space.config.objspace.std.withmethodcachecounter:
            self.hits = {}
            self.misses = {}

    def clear(self):
        None_None = (None, None)
        for i in range(len(self.versions)):
            self.versions[i] = None
        for i in range(len(self.names)):
            self.names[i] = None
        for i in range(len(self.lookup_where)):
            self.lookup_where[i] = None_None

# possible values of compares_by_identity_status
UNKNOWN = 0
COMPARES_BY_IDENTITY = 1
OVERRIDES_EQ_CMP_OR_HASH = 2

class W_TypeObject(W_Object):
    from pypy.objspace.std.typetype import type_typedef as typedef

    lazyloaders = {} # can be overridden by specific instances

    # the version_tag changes if the dict or the inheritance hierarchy changes
    # other changes to the type (e.g. the name) leave it unchanged
    _version_tag = None

    _immutable_fields_ = ["flag_heaptype",
                          "flag_cpytype",
                          "flag_abstract?",
                          'needsdel',
                          'weakrefable',
                          'hasdict',
                          'nslots',
                          'instancetypedef',
                          'terminator',
                          '_version_tag?',
                          'name?',
                          'mro_w?[*]',
                          ]

    # for config.objspace.std.getattributeshortcut
    # (False is a conservative default, fixed during real usage)
    uses_object_getattribute = False

    # for config.objspace.std.withidentitydict
    compares_by_identity_status = UNKNOWN

    # used to cache the type's __new__ function
    w_new_function = None

    @dont_look_inside
    def __init__(w_self, space, name, bases_w, dict_w,
                 overridetypedef=None):
        w_self.space = space
        w_self.name = name
        w_self.bases_w = bases_w
        w_self.dict_w = dict_w
        w_self.nslots = 0
        w_self.hasdict = False
        w_self.needsdel = False
        w_self.weakrefable = False
        w_self.w_doc = space.w_None
        w_self.weak_subclasses = []
        w_self.flag_heaptype = False
        w_self.flag_cpytype = False
        w_self.flag_abstract = False
        w_self.instancetypedef = overridetypedef

        if overridetypedef is not None:
            setup_builtin_type(w_self)
        else:
            setup_user_defined_type(w_self)
        w_self.w_same_layout_as = get_parent_layout(w_self)

        if space.config.objspace.std.withtypeversion:
            if not is_mro_purely_of_types(w_self.mro_w):
                pass
            else:
                # the _version_tag should change, whenever the content of
                # dict_w of any of the types in the mro changes, or if the mro
                # itself changes
                w_self._version_tag = VersionTag()
        if space.config.objspace.std.withmapdict:
            from pypy.objspace.std.mapdict import DictTerminator, NoDictTerminator
            if w_self.hasdict:
                w_self.terminator = DictTerminator(space, w_self)
            else:
                w_self.terminator = NoDictTerminator(space, w_self)

    def mutated(w_self, key):
        """
        The type is being mutated. key is either the string containing the
        specific attribute which is being deleted/set or None to indicate a
        generic mutation.
        """
        space = w_self.space
        assert w_self.is_heaptype()
        if (not space.config.objspace.std.withtypeversion and
            not space.config.objspace.std.getattributeshortcut and
            not space.config.objspace.std.withidentitydict and
            not space.config.objspace.std.newshortcut):
            return

        if space.config.objspace.std.getattributeshortcut:
            w_self.uses_object_getattribute = False
            # ^^^ conservative default, fixed during real usage

        if space.config.objspace.std.withidentitydict:
            if (key is None or key == '__eq__' or
                key == '__cmp__' or key == '__hash__'):
                w_self.compares_by_identity_status = UNKNOWN

        if space.config.objspace.std.newshortcut:
            w_self.w_new_function = None

        if (space.config.objspace.std.withtypeversion
            and w_self._version_tag is not None):
            w_self._version_tag = VersionTag()

        subclasses_w = w_self.get_subclasses()
        for w_subclass in subclasses_w:
            assert isinstance(w_subclass, W_TypeObject)
            w_subclass.mutated(key)

    def version_tag(w_self):
        if not we_are_jitted() or w_self.is_heaptype():
            return w_self._version_tag
        # prebuilt objects cannot get their version_tag changed
        return w_self._pure_version_tag()

    @elidable_promote()
    def _pure_version_tag(w_self):
        return w_self._version_tag

    def getattribute_if_not_from_object(w_self):
        """ this method returns the applevel __getattribute__ if that is not
        the one from object, in which case it returns None """
        from pypy.objspace.descroperation import object_getattribute
        if not we_are_jitted():
            shortcut = w_self.space.config.objspace.std.getattributeshortcut
            if not shortcut or not w_self.uses_object_getattribute:
                # slow path: look for a custom __getattribute__ on the class
                w_descr = w_self.lookup('__getattribute__')
                # if it was not actually overriden in the class, we remember this
                # fact for the next time.
                if w_descr is object_getattribute(w_self.space):
                    if shortcut:
                        w_self.uses_object_getattribute = True
                else:
                    return w_descr
            return None
        # in the JIT case, just use a lookup, because it is folded away
        # correctly using the version_tag
        w_descr = w_self.lookup('__getattribute__')
        if w_descr is not object_getattribute(w_self.space):
            return w_descr

    def has_object_getattribute(w_self):
        return w_self.getattribute_if_not_from_object() is None

    def compares_by_identity(w_self):
        from pypy.objspace.descroperation import object_hash, type_eq
        if not w_self.space.config.objspace.std.withidentitydict:
            return False # conservative
        #
        if w_self.compares_by_identity_status != UNKNOWN:
            # fast path
            return w_self.compares_by_identity_status == COMPARES_BY_IDENTITY
        #
        default_hash = object_hash(w_self.space)
        my_eq = w_self.lookup('__eq__')
        overrides_eq = (my_eq and my_eq is not type_eq(w_self.space))
        overrides_eq_cmp_or_hash = (overrides_eq or
                                    w_self.lookup('__cmp__') or
                                    w_self.lookup('__hash__') is not default_hash)
        if overrides_eq_cmp_or_hash:
            w_self.compares_by_identity_status = OVERRIDES_EQ_CMP_OR_HASH
        else:
            w_self.compares_by_identity_status = COMPARES_BY_IDENTITY
        return w_self.compares_by_identity_status == COMPARES_BY_IDENTITY

    def ready(w_self):
        for w_base in w_self.bases_w:
            if not isinstance(w_base, W_TypeObject):
                continue
            w_base.add_subclass(w_self)

    # compute a tuple that fully describes the instance layout
    def get_full_instance_layout(w_self):
        w_layout = w_self.w_same_layout_as or w_self
        return (w_layout, w_self.hasdict, w_self.needsdel, w_self.weakrefable)

    def compute_default_mro(w_self):
        return compute_C3_mro(w_self.space, w_self)

    def getdictvalue(w_self, space, attr):
        if space.config.objspace.std.withtypeversion:
            version_tag = w_self.version_tag()
            if version_tag is not None:
                return unwrap_cell(
                    space,
                    w_self._pure_getdictvalue_no_unwrapping(
                        space, version_tag, attr))
        w_value = w_self._getdictvalue_no_unwrapping(space, attr)
        return unwrap_cell(space, w_value)

    def _getdictvalue_no_unwrapping(w_self, space, attr):
        w_value = w_self.dict_w.get(attr, None)
        if w_self.lazyloaders and w_value is None:
            if attr in w_self.lazyloaders:
                # very clever next line: it forces the attr string
                # to be interned.
                w_attr = space.new_interned_str(attr)
                loader = w_self.lazyloaders[attr]
                del w_self.lazyloaders[attr]
                w_value = loader()
                if w_value is not None:   # None means no such attribute
                    w_self.dict_w[attr] = w_value
                    return w_value
        return w_value

    @elidable
    def _pure_getdictvalue_no_unwrapping(w_self, space, version_tag, attr):
        return w_self._getdictvalue_no_unwrapping(space, attr)

    def setdictvalue(w_self, space, name, w_value):
        if not w_self.is_heaptype():
            msg = "can't set attributes on type object '%s'"
            raise operationerrfmt(space.w_TypeError, msg, w_self.name)
        if name == "__del__" and name not in w_self.dict_w:
            msg = "a __del__ method added to an existing type will not be called"
            space.warn(msg, space.w_RuntimeWarning)
        if space.config.objspace.std.withtypeversion:
            version_tag = w_self.version_tag()
            if version_tag is not None:
                w_curr = w_self._pure_getdictvalue_no_unwrapping(
                        space, version_tag, name)
                if w_curr is not None:
                    if isinstance(w_curr, TypeCell):
                        w_curr.w_value = w_value
                        return True
                    w_value = TypeCell(w_value)
        w_self.mutated(name)
        w_self.dict_w[name] = w_value
        return True

    def deldictvalue(w_self, space, key):
        if w_self.lazyloaders:
            w_self._cleanup_()    # force un-lazification
        if not w_self.is_heaptype():
            msg = "can't delete attributes on type object '%s'"
            raise operationerrfmt(space.w_TypeError, msg, w_self.name)
        try:
            del w_self.dict_w[key]
        except KeyError:
            return False
        else:
            w_self.mutated(key)
            return True

    def lookup(w_self, name):
        # note that this doesn't call __get__ on the result at all
        space = w_self.space
        if space.config.objspace.std.withmethodcache:
            return w_self.lookup_where_with_method_cache(name)[1]

        return w_self._lookup(name)

    def lookup_where(w_self, name):
        space = w_self.space
        if space.config.objspace.std.withmethodcache:
            return w_self.lookup_where_with_method_cache(name)

        return w_self._lookup_where(name)

    @unroll_safe
    def lookup_starting_at(w_self, w_starttype, name):
        space = w_self.space
        look = False
        for w_class in w_self.mro_w:
            if w_class is w_starttype:
                look = True
            elif look:
                w_value = w_class.getdictvalue(space, name)
                if w_value is not None:
                    return w_value
        return None

    @unroll_safe
    def _lookup(w_self, key):
        space = w_self.space
        for w_class in w_self.mro_w:
            w_value = w_class.getdictvalue(space, key)
            if w_value is not None:
                return w_value
        return None

    @unroll_safe
    def _lookup_where(w_self, key):
        # like lookup() but also returns the parent class in which the
        # attribute was found
        space = w_self.space
        for w_class in w_self.mro_w:
            w_value = w_class.getdictvalue(space, key)
            if w_value is not None:
                return w_class, w_value
        return None, None

    def _lookup_where_all_typeobjects(w_self, key):
        # like _lookup_where(), but when we know that w_self.mro_w only
        # contains W_TypeObjects.  (It differs from _lookup_where() mostly
        # from a JIT point of view: it cannot invoke arbitrary Python code.)
        space = w_self.space
        for w_class in w_self.mro_w:
            assert isinstance(w_class, W_TypeObject)
            w_value = w_class._getdictvalue_no_unwrapping(space, key)
            if w_value is not None:
                return w_class, w_value
        return None, None

    def lookup_where_with_method_cache(w_self, name):
        space = w_self.space
        promote(w_self)
        assert space.config.objspace.std.withmethodcache
        version_tag = promote(w_self.version_tag())
        if version_tag is None:
            tup = w_self._lookup_where(name)
            return tup
        name = promote_string(name)
        w_class, w_value = w_self._pure_lookup_where_with_method_cache(name, version_tag)
        return w_class, unwrap_cell(space, w_value)

    @elidable
    def _pure_lookup_where_with_method_cache(w_self, name, version_tag):
        space = w_self.space
        cache = space.fromcache(MethodCache)
        SHIFT2 = r_uint.BITS - space.config.objspace.std.methodcachesizeexp
        SHIFT1 = SHIFT2 - 5
        version_tag_as_int = current_object_addr_as_int(version_tag)
        # ^^^Note: if the version_tag object is moved by a moving GC, the
        # existing method cache entries won't be found any more; new
        # entries will be created based on the new address.  The
        # assumption is that the version_tag object won't keep moving all
        # the time - so using the fast current_object_addr_as_int() instead
        # of a slower solution like hash() is still a good trade-off.
        hash_name = compute_hash(name)
        product = intmask(version_tag_as_int * hash_name)
        method_hash = (r_uint(product) ^ (r_uint(product) << SHIFT1)) >> SHIFT2
        # ^^^Note2: we used to just take product>>SHIFT2, but on 64-bit
        # platforms SHIFT2 is really large, and we loose too much information
        # that way (as shown by failures of the tests that typically have
        # method names like 'f' who hash to a number that has only ~33 bits).
        cached_version_tag = cache.versions[method_hash]
        if cached_version_tag is version_tag:
            cached_name = cache.names[method_hash]
            if cached_name is name:
                tup = cache.lookup_where[method_hash]
                if space.config.objspace.std.withmethodcachecounter:
                    cache.hits[name] = cache.hits.get(name, 0) + 1
#                print "hit", w_self, name
                return tup
        tup = w_self._lookup_where_all_typeobjects(name)
        cache.versions[method_hash] = version_tag
        cache.names[method_hash] = name
        cache.lookup_where[method_hash] = tup
        if space.config.objspace.std.withmethodcachecounter:
            cache.misses[name] = cache.misses.get(name, 0) + 1
#        print "miss", w_self, name
        return tup

    def check_user_subclass(w_self, w_subtype):
        space = w_self.space
        if not isinstance(w_subtype, W_TypeObject):
            raise operationerrfmt(space.w_TypeError,
                "X is not a type object ('%s')",
                space.type(w_subtype).getname(space))
        if not w_subtype.issubtype(w_self):
            raise operationerrfmt(space.w_TypeError,
                "%s.__new__(%s): %s is not a subtype of %s",
                w_self.name, w_subtype.name, w_subtype.name, w_self.name)
        if w_self.instancetypedef is not w_subtype.instancetypedef:
            raise operationerrfmt(space.w_TypeError,
                "%s.__new__(%s) is not safe, use %s.__new__()",
                w_self.name, w_subtype.name, w_subtype.name)
        return w_subtype

    def _cleanup_(w_self):
        "NOT_RPYTHON.  Forces the lazy attributes to be computed."
        if 'lazyloaders' in w_self.__dict__:
            for attr in w_self.lazyloaders.keys():
                w_self.getdictvalue(w_self.space, attr)
            del w_self.lazyloaders

    def getdict(w_self, space): # returning a dict-proxy!
        from pypy.objspace.std.dictproxyobject import DictProxyStrategy
        from pypy.objspace.std.dictmultiobject import W_DictMultiObject
        if w_self.lazyloaders:
            w_self._cleanup_()    # force un-lazification
        strategy = space.fromcache(DictProxyStrategy)
        storage = strategy.erase(w_self)
        return W_DictMultiObject(space, strategy, storage)

    def unwrap(w_self, space):
        from pypy.objspace.std.model import UnwrapError
        raise UnwrapError(w_self)

    def is_heaptype(w_self):
        return w_self.flag_heaptype

    def is_cpytype(w_self):
        return w_self.flag_cpytype

    def is_abstract(w_self):
        return w_self.flag_abstract

    def set_abstract(w_self, abstract):
        w_self.flag_abstract = bool(abstract)

    def issubtype(w_self, w_type):
        promote(w_self)
        promote(w_type)
        if w_self.space.config.objspace.std.withtypeversion and we_are_jitted():
            version_tag1 = w_self.version_tag()
            version_tag2 = w_type.version_tag()
            if version_tag1 is not None and version_tag2 is not None:
                res = _pure_issubtype(w_self, w_type, version_tag1, version_tag2)
                return res
        return _issubtype(w_self, w_type)

    def get_module(w_self):
        space = w_self.space
        if w_self.is_heaptype() and '__module__' in w_self.dict_w:
            return w_self.getdictvalue(space, '__module__')
        else:
            # for non-heap types, CPython checks for a module.name in the
            # type name.  That's a hack, so we're allowed to use a different
            # hack...
            if ('__module__' in w_self.dict_w and
                space.isinstance_w(w_self.getdictvalue(space, '__module__'),
                                               space.w_str)):
                return w_self.getdictvalue(space, '__module__')
            return space.wrap('__builtin__')

    def get_module_type_name(w_self):
        space = w_self.space
        w_mod = w_self.get_module()
        if not space.isinstance_w(w_mod, space.w_str):
            mod = '__builtin__'
        else:
            mod = space.str_w(w_mod)
        if mod !='__builtin__':
            return '%s.%s' % (mod, w_self.name)
        else:
            return w_self.name

    def add_subclass(w_self, w_subclass):
        space = w_self.space
        if not space.config.translation.rweakref:
            return    # no weakref support, don't keep track of subclasses
        import weakref
        assert isinstance(w_subclass, W_TypeObject)
        newref = weakref.ref(w_subclass)
        for i in range(len(w_self.weak_subclasses)):
            ref = w_self.weak_subclasses[i]
            if ref() is None:
                w_self.weak_subclasses[i] = newref
                return
        else:
            w_self.weak_subclasses.append(newref)

    def remove_subclass(w_self, w_subclass):
        space = w_self.space
        if not space.config.translation.rweakref:
            return    # no weakref support, don't keep track of subclasses
        for i in range(len(w_self.weak_subclasses)):
            ref = w_self.weak_subclasses[i]
            if ref() is w_subclass:
                del w_self.weak_subclasses[i]
                return

    def get_subclasses(w_self):
        space = w_self.space
        if not space.config.translation.rweakref:
            msg = ("this feature requires weakrefs, "
                   "which are not available in this build of PyPy")
            raise OperationError(space.w_RuntimeError,
                                 space.wrap(msg))
        subclasses_w = []
        for ref in w_self.weak_subclasses:
            w_ob = ref()
            if w_ob is not None:
                subclasses_w.append(w_ob)
        return subclasses_w


    # for now, weakref support for W_TypeObject is hard to get automatically
    _lifeline_ = None
    def getweakref(self):
        return self._lifeline_
    def setweakref(self, space, weakreflifeline):
        self._lifeline_ = weakreflifeline
    def delweakref(self):
        self._lifeline_ = None

# ____________________________________________________________
# Initialization of type objects

def get_parent_layout(w_type):
    """Compute the most parent class of 'w_type' whose layout
       is the same as 'w_type', or None if all parents of 'w_type'
       have a different layout than 'w_type'.
    """
    w_starttype = w_type
    while len(w_type.bases_w) > 0:
        w_bestbase = find_best_base(w_type.space, w_type.bases_w)
        if w_type.instancetypedef is not w_bestbase.instancetypedef:
            break
        if w_type.nslots != w_bestbase.nslots:
            break
        w_type = w_bestbase
    if w_type is not w_starttype:
        return w_type
    else:
        return None

def issublayout(w_layout1, w_layout2):
    space = w_layout2.space
    while w_layout1 is not w_layout2:
        w_layout1 = find_best_base(space, w_layout1.bases_w)
        if w_layout1 is None:
            return False
        w_layout1 = w_layout1.w_same_layout_as or w_layout1
    return True

def find_best_base(space, bases_w):
    """The best base is one of the bases in the given list: the one
       whose layout a new type should use as a starting point.
    """
    w_bestbase = None
    for w_candidate in bases_w:
        if not isinstance(w_candidate, W_TypeObject):
            continue
        if w_bestbase is None:
            w_bestbase = w_candidate   # for now
            continue
        candtypedef = w_candidate.instancetypedef
        besttypedef = w_bestbase.instancetypedef
        if candtypedef is besttypedef:
            # two candidates with the same typedef are equivalent unless
            # one has extra slots over the other
            if w_candidate.nslots > w_bestbase.nslots:
                w_bestbase = w_candidate
        elif issubtypedef(candtypedef, besttypedef):
            w_bestbase = w_candidate
    return w_bestbase

def check_and_find_best_base(space, bases_w):
    """The best base is one of the bases in the given list: the one
       whose layout a new type should use as a starting point.
       This version checks that bases_w is an acceptable tuple of bases.
    """
    w_bestbase = find_best_base(space, bases_w)
    if w_bestbase is None:
        raise OperationError(space.w_TypeError,
                             space.wrap("a new-style class can't have "
                                        "only classic bases"))
    if not w_bestbase.instancetypedef.acceptable_as_base_class:
        raise operationerrfmt(space.w_TypeError,
                              "type '%s' is not an "
                              "acceptable base class",
                              w_bestbase.instancetypedef.name)

    # check that all other bases' layouts are superclasses of the bestbase
    w_bestlayout = w_bestbase.w_same_layout_as or w_bestbase
    for w_base in bases_w:
        if isinstance(w_base, W_TypeObject):
            w_layout = w_base.w_same_layout_as or w_base
            if not issublayout(w_bestlayout, w_layout):
                raise OperationError(space.w_TypeError,
                                     space.wrap("instance layout conflicts in "
                                                "multiple inheritance"))
    return w_bestbase

def copy_flags_from_bases(w_self, w_bestbase):
    hasoldstylebase = False
    for w_base in w_self.bases_w:
        if not isinstance(w_base, W_TypeObject):
            hasoldstylebase = True
            continue
        w_self.hasdict = w_self.hasdict or w_base.hasdict
        w_self.needsdel = w_self.needsdel or w_base.needsdel
        w_self.weakrefable = w_self.weakrefable or w_base.weakrefable
    w_self.nslots = w_bestbase.nslots
    return hasoldstylebase

def create_all_slots(w_self, hasoldstylebase):
    space = w_self.space
    dict_w = w_self.dict_w
    if '__slots__' not in dict_w:
        wantdict = True
        wantweakref = True
    else:
        wantdict = False
        wantweakref = False
        w_slots = dict_w['__slots__']
        if (space.isinstance_w(w_slots, space.w_str) or
            space.isinstance_w(w_slots, space.w_unicode)):
            slot_names_w = [w_slots]
        else:
            slot_names_w = space.unpackiterable(w_slots)
        for w_slot_name in slot_names_w:
            slot_name = space.str_w(w_slot_name)
            if slot_name == '__dict__':
                if wantdict or w_self.hasdict:
                    raise OperationError(space.w_TypeError,
                            space.wrap("__dict__ slot disallowed: "
                                       "we already got one"))
                wantdict = True
            elif slot_name == '__weakref__':
                if wantweakref or w_self.weakrefable:
                    raise OperationError(space.w_TypeError,
                            space.wrap("__weakref__ slot disallowed: "
                                       "we already got one"))
                wantweakref = True
            else:
                create_slot(w_self, slot_name)
    wantdict = wantdict or hasoldstylebase
    if wantdict: create_dict_slot(w_self)
    if wantweakref: create_weakref_slot(w_self)
    if '__del__' in dict_w: w_self.needsdel = True

def create_slot(w_self, slot_name):
    space = w_self.space
    if not valid_slot_name(slot_name):
        raise OperationError(space.w_TypeError,
                             space.wrap('__slots__ must be identifiers'))
    # create member
    slot_name = _mangle(slot_name, w_self.name)
    if slot_name not in w_self.dict_w:
        # Force interning of slot names.
        slot_name = space.str_w(space.new_interned_str(slot_name))
        # in cpython it is ignored less, but we probably don't care
        member = Member(w_self.nslots, slot_name, w_self)
        w_self.dict_w[slot_name] = space.wrap(member)
        w_self.nslots += 1

def create_dict_slot(w_self):
    if not w_self.hasdict:
        w_self.dict_w.setdefault('__dict__',
                                 w_self.space.wrap(std_dict_descr))
        w_self.hasdict = True

def create_weakref_slot(w_self):
    if not w_self.weakrefable:
        w_self.dict_w.setdefault('__weakref__',
                                 w_self.space.wrap(weakref_descr))
        w_self.weakrefable = True

def valid_slot_name(slot_name):
    if len(slot_name) == 0 or slot_name[0].isdigit():
        return False
    for c in slot_name:
        if not c.isalnum() and c != '_':
            return False
    return True

def setup_user_defined_type(w_self):
    if len(w_self.bases_w) == 0:
        w_self.bases_w = [w_self.space.w_object]
    w_bestbase = check_and_find_best_base(w_self.space, w_self.bases_w)
    w_self.instancetypedef = w_bestbase.instancetypedef
    w_self.flag_heaptype = True
    for w_base in w_self.bases_w:
        if not isinstance(w_base, W_TypeObject):
            continue
        w_self.flag_cpytype |= w_base.flag_cpytype
        w_self.flag_abstract |= w_base.flag_abstract

    hasoldstylebase = copy_flags_from_bases(w_self, w_bestbase)
    create_all_slots(w_self, hasoldstylebase)

    ensure_common_attributes(w_self)

def setup_builtin_type(w_self):
    w_self.hasdict = w_self.instancetypedef.hasdict
    w_self.weakrefable = w_self.instancetypedef.weakrefable
    w_self.w_doc = w_self.space.wrap(w_self.instancetypedef.doc)
    ensure_common_attributes(w_self)

def ensure_common_attributes(w_self):
    ensure_static_new(w_self)
    w_self.dict_w.setdefault('__doc__', w_self.w_doc)
    if w_self.is_heaptype():
        ensure_module_attr(w_self)
    w_self.mro_w = []      # temporarily
    compute_mro(w_self)

def ensure_static_new(w_self):
    # special-case __new__, as in CPython:
    # if it is a Function, turn it into a static method
    if '__new__' in w_self.dict_w:
        w_new = w_self.dict_w['__new__']
        if isinstance(w_new, Function):
            w_self.dict_w['__new__'] = StaticMethod(w_new)

def ensure_module_attr(w_self):
    # initialize __module__ in the dict (user-defined types only)
    if '__module__' not in w_self.dict_w:
        space = w_self.space
        caller = space.getexecutioncontext().gettopframe_nohidden()
        if caller is not None:
            w_globals = caller.w_globals
            w_name = space.finditem(w_globals, space.wrap('__name__'))
            if w_name is not None:
                w_self.dict_w['__module__'] = w_name

def compute_mro(w_self):
    if w_self.is_heaptype():
        space = w_self.space
        w_metaclass = space.type(w_self)
        w_where, w_mro_func = space.lookup_in_type_where(w_metaclass, 'mro')
        if w_mro_func is not None and not space.is_w(w_where, space.w_type):
            w_mro_meth = space.get(w_mro_func, w_self)
            w_mro = space.call_function(w_mro_meth)
            mro_w = space.fixedview(w_mro)
            w_self.mro_w = validate_custom_mro(space, mro_w)
            return    # done
    w_self.mro_w = w_self.compute_default_mro()[:]

def validate_custom_mro(space, mro_w):
    # do some checking here.  Note that unlike CPython, strange MROs
    # cannot really segfault PyPy.  At a minimum, we check that all
    # the elements in the mro seem to be (old- or new-style) classes.
    for w_class in mro_w:
        if not space.abstract_isclass_w(w_class):
            raise OperationError(space.w_TypeError,
                                 space.wrap("mro() returned a non-class"))
    return mro_w

def is_mro_purely_of_types(mro_w):
    for w_class in mro_w:
        if not isinstance(w_class, W_TypeObject):
            return False
    return True

# ____________________________________________________________

def call__Type(space, w_type, __args__):
    promote(w_type)
    # invoke the __new__ of the type
    if not we_are_jitted():
        # note that the annotator will figure out that w_type.w_new_function
        # can only be None if the newshortcut config option is not set
        w_newfunc = w_type.w_new_function
    else:
        # for the JIT it is better to take the slow path because normal lookup
        # is nicely optimized, but the w_type.w_new_function attribute is not
        # known to the JIT
        w_newfunc = None
    if w_newfunc is None:
        w_newtype, w_newdescr = w_type.lookup_where('__new__')
        w_newfunc = space.get(w_newdescr, w_type)
        if (space.config.objspace.std.newshortcut and
            not we_are_jitted() and
            isinstance(w_newtype, W_TypeObject)):
            w_type.w_new_function = w_newfunc
    w_newobject = space.call_obj_args(w_newfunc, w_type, __args__)
    call_init = space.isinstance_w(w_newobject, w_type)

    # maybe invoke the __init__ of the type
    if (call_init and not (space.is_w(w_type, space.w_type) and
        not __args__.keywords and len(__args__.arguments_w) == 1)):
        w_descr = space.lookup(w_newobject, '__init__')
        w_result = space.get_and_call_args(w_descr, w_newobject, __args__)
        if not space.is_w(w_result, space.w_None):
            raise OperationError(space.w_TypeError,
                                 space.wrap("__init__() should return None"))
    return w_newobject

def _issubtype(w_sub, w_type):
    return w_type in w_sub.mro_w

@elidable_promote()
def _pure_issubtype(w_sub, w_type, version_tag1, version_tag2):
    return _issubtype(w_sub, w_type)

def issubtype__Type_Type(space, w_type, w_sub):
    return space.newbool(w_sub.issubtype(w_type))

def isinstance__Type_ANY(space, w_type, w_inst):
    return space.newbool(space.type(w_inst).issubtype(w_type))

def repr__Type(space, w_obj):
    w_mod = w_obj.get_module()
    if not space.isinstance_w(w_mod, space.w_str):
        mod = None
    else:
        mod = space.str_w(w_mod)
    if not w_obj.is_heaptype():
        kind = 'type'
    else:
        kind = 'class'
    if mod is not None and mod !='__builtin__':
        return space.wrap("<%s '%s.%s'>" % (kind, mod, w_obj.name))
    else:
        return space.wrap("<%s '%s'>" % (kind, w_obj.name))

def getattr__Type_ANY(space, w_type, w_name):
    name = space.str_w(w_name)
    w_descr = space.lookup(w_type, name)
    if w_descr is not None:
        if space.is_data_descr(w_descr):
            w_get = space.lookup(w_descr, "__get__")
            if w_get is not None:
                return space.get_and_call_function(w_get, w_descr, w_type,
                                                   space.type(w_type))
    w_value = w_type.lookup(name)
    if w_value is not None:
        # __get__(None, type): turns e.g. functions into unbound methods
        return space.get(w_value, space.w_None, w_type)
    if w_descr is not None:
        return space.get(w_descr,w_type)
    raise operationerrfmt(space.w_AttributeError,
                          "type object '%s' has no attribute '%s'",
                          w_type.name, name)

def eq__Type_Type(space, w_self, w_other):
    return space.is_(w_self, w_other)

# ____________________________________________________________


abstract_mro = gateway.applevel("""
    def abstract_mro(klass):
        # abstract/classic mro
        mro = []
        stack = [klass]
        while stack:
            klass = stack.pop()
            if klass not in mro:
                mro.append(klass)
                if not isinstance(klass.__bases__, tuple):
                    raise TypeError, '__bases__ must be a tuple'
                stack += klass.__bases__[::-1]
        return mro
""", filename=__file__).interphook("abstract_mro")

def get_mro(space, klass):
    if isinstance(klass, W_TypeObject):
        return list(klass.mro_w)
    else:
        return space.unpackiterable(abstract_mro(space, klass))


def compute_C3_mro(space, cls):
    order = []
    orderlists = [get_mro(space, base) for base in cls.bases_w]
    orderlists.append([cls] + cls.bases_w)
    while orderlists:
        for candidatelist in orderlists:
            candidate = candidatelist[0]
            if mro_blockinglist(candidate, orderlists) is None:
                break    # good candidate
        else:
            return mro_error(space, orderlists)  # no candidate found
        assert candidate not in order
        order.append(candidate)
        for i in range(len(orderlists)-1, -1, -1):
            if orderlists[i][0] is candidate:
                del orderlists[i][0]
                if len(orderlists[i]) == 0:
                    del orderlists[i]
    return order


def mro_blockinglist(candidate, orderlists):
    for lst in orderlists:
        if candidate in lst[1:]:
            return lst
    return None # good candidate

def mro_error(space, orderlists):
    cycle = []
    candidate = orderlists[-1][0]
    if candidate in orderlists[-1][1:]:
        # explicit error message for this specific case
        raise operationerrfmt(space.w_TypeError,
                              "duplicate base class '%s'",
                              candidate.getname(space))
    while candidate not in cycle:
        cycle.append(candidate)
        nextblockinglist = mro_blockinglist(candidate, orderlists)
        candidate = nextblockinglist[0]
    del cycle[:cycle.index(candidate)]
    cycle.append(candidate)
    cycle.reverse()
    names = [cls.getname(space) for cls in cycle]
    raise OperationError(space.w_TypeError,
        space.wrap("cycle among base classes: " + ' < '.join(names)))

# ____________________________________________________________

register_all(vars())
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