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from rpython.flowspace.model import Constant
from rpython.rtyper.lltypesystem import lltype, llmemory, rdict
from rpython.rtyper.lltypesystem.llmemory import weakref_create, weakref_deref
from rpython.rtyper import rclass
from rpython.rtyper.rclass import getinstancerepr
from rpython.rtyper.rmodel import Repr
from rpython.rlib.rweakref import RWeakKeyDictionary
from rpython.rlib import jit
from rpython.rlib.objectmodel import compute_identity_hash
# Warning: this implementation of RWeakKeyDictionary is not exactly
# leaking, but can keep around some values for a long time, even after
# the corresponding keys were freed. They will be eventually freed if
# you continue to manipulate the dictionary. Avoid to use this if the
# values are objects that might keep alive tons of memory.
class WeakKeyDictRepr(Repr):
def __init__(self, rtyper):
self.rtyper = rtyper
self.lowleveltype = lltype.Ptr(WEAKDICT)
self.dict_cache = {}
def convert_const(self, weakdict):
if not isinstance(weakdict, RWeakKeyDictionary):
raise TyperError("expected an RWeakKeyDictionary: %r" % (
weakdict,))
try:
key = Constant(weakdict)
return self.dict_cache[key]
except KeyError:
self.setup()
if weakdict.length() != 0:
raise TyperError("got a non-empty prebuilt RWeakKeyDictionary")
l_dict = ll_new_weakdict()
self.dict_cache[key] = l_dict
return l_dict
def rtype_method_get(self, hop):
r_object = getinstancerepr(self.rtyper, None)
v_d, v_key = hop.inputargs(self, r_object)
hop.exception_cannot_occur()
v_result = hop.gendirectcall(ll_get, v_d, v_key)
v_result = hop.genop("cast_pointer", [v_result],
resulttype=hop.r_result.lowleveltype)
return v_result
def rtype_method_set(self, hop):
r_object = getinstancerepr(self.rtyper, None)
v_d, v_key, v_value = hop.inputargs(self, r_object, r_object)
hop.exception_cannot_occur()
if hop.args_s[2].is_constant() and hop.args_s[2].const is None:
hop.gendirectcall(ll_set_null, v_d, v_key)
else:
hop.gendirectcall(ll_set, v_d, v_key, v_value)
def rtype_method_length(self, hop):
v_d, = hop.inputargs(self)
hop.exception_cannot_occur()
return hop.gendirectcall(ll_length, v_d)
def specialize_make_weakdict(hop):
hop.exception_cannot_occur()
v_d = hop.gendirectcall(ll_new_weakdict)
return v_d
# ____________________________________________________________
NULLVALUE = lltype.nullptr(rclass.OBJECTPTR.TO)
WEAKDICTENTRY = lltype.Struct("weakdictentry",
("key", llmemory.WeakRefPtr),
("value", rclass.OBJECTPTR),
("f_hash", lltype.Signed))
def ll_debugrepr(x):
if x:
h = compute_identity_hash(x)
else:
h = 0
return '<%x>' % (h,)
def ll_valid(entries, i):
key = entries[i].key
if not key:
return False
elif weakref_deref(rclass.OBJECTPTR, key):
return True
else:
# The entry might be a dead weakref still holding a strong
# reference to the value; for this case, we clear the old
# value from the entry, if any.
entries[i].value = NULLVALUE
return False
def ll_everused(entries, i):
return bool(entries[i].key)
entrymeths = {
'allocate': lltype.typeMethod(rdict._ll_malloc_entries),
'delete': rdict._ll_free_entries,
'valid': ll_valid,
'everused': ll_everused,
'hash': rdict.ll_hash_from_cache,
'no_direct_compare': True,
}
WEAKDICTENTRYARRAY = lltype.GcArray(WEAKDICTENTRY,
adtmeths=entrymeths,
hints={'weakarray': 'key'})
# NB. the 'hints' is not used so far ^^^
@jit.dont_look_inside
def ll_new_weakdict():
d = lltype.malloc(WEAKDICT)
d.entries = WEAKDICT.entries.TO.allocate(rdict.DICT_INITSIZE)
d.num_items = 0
d.resize_counter = rdict.DICT_INITSIZE * 2
return d
@jit.dont_look_inside
def ll_get(d, llkey):
hash = compute_identity_hash(llkey)
i = rdict.ll_dict_lookup(d, llkey, hash) & rdict.MASK
#llop.debug_print(lltype.Void, i, 'get', hex(hash),
# ll_debugrepr(d.entries[i].key),
# ll_debugrepr(d.entries[i].value))
# NB. ll_valid() above was just called at least on entry i, so if
# it is an invalid entry with a dead weakref, the value was reset
# to NULLVALUE.
return d.entries[i].value
@jit.dont_look_inside
def ll_set(d, llkey, llvalue):
if llvalue:
ll_set_nonnull(d, llkey, llvalue)
else:
ll_set_null(d, llkey)
@jit.dont_look_inside
def ll_set_nonnull(d, llkey, llvalue):
hash = compute_identity_hash(llkey)
keyref = weakref_create(llkey) # GC effects here, before the rest
i = rdict.ll_dict_lookup(d, llkey, hash) & rdict.MASK
everused = d.entries.everused(i)
d.entries[i].key = keyref
d.entries[i].value = llvalue
d.entries[i].f_hash = hash
#llop.debug_print(lltype.Void, i, 'stored', hex(hash),
# ll_debugrepr(llkey),
# ll_debugrepr(llvalue))
if not everused:
d.resize_counter -= 3
if d.resize_counter <= 0:
#llop.debug_print(lltype.Void, 'RESIZE')
ll_weakdict_resize(d)
@jit.dont_look_inside
def ll_set_null(d, llkey):
hash = compute_identity_hash(llkey)
i = rdict.ll_dict_lookup(d, llkey, hash) & rdict.MASK
if d.entries.everused(i):
# If the entry was ever used, clean up its key and value.
# We don't store a NULL value, but a dead weakref, because
# the entry must still be marked as everused().
d.entries[i].key = llmemory.dead_wref
d.entries[i].value = NULLVALUE
#llop.debug_print(lltype.Void, i, 'zero')
def ll_update_num_items(d):
entries = d.entries
num_items = 0
for i in range(len(entries)):
if entries.valid(i):
num_items += 1
d.num_items = num_items
def ll_weakdict_resize(d):
# first set num_items to its correct, up-to-date value
ll_update_num_items(d)
rdict.ll_dict_resize(d)
def ll_keyeq(d, weakkey1, realkey2):
# only called by ll_dict_lookup() with the first arg coming from an
# entry.key, and the 2nd arg being the argument to ll_dict_lookup().
if not weakkey1:
assert bool(realkey2)
return False
return weakref_deref(rclass.OBJECTPTR, weakkey1) == realkey2
@jit.dont_look_inside
def ll_length(d):
# xxx slow, but it's only for debugging
ll_update_num_items(d)
#llop.debug_print(lltype.Void, 'length:', d.num_items)
return d.num_items
dictmeths = {
'll_get': ll_get,
'll_set': ll_set,
'keyeq': ll_keyeq,
'paranoia': False,
}
WEAKDICT = lltype.GcStruct("weakkeydict",
("num_items", lltype.Signed),
("resize_counter", lltype.Signed),
("entries", lltype.Ptr(WEAKDICTENTRYARRAY)),
adtmeths=dictmeths)
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