def get_rpy_referents(space, w_obj):
"""Return a list of all the referents, as reported by the GC.
This is likely to contain a lot of GcRefs."""
gcref = unwrap(space, w_obj)
lst = rgc.get_rpy_referents(gcref)
if lst is None:
raise missing_operation(space)
return space.newlist([wrap(space, gcref) for gcref in lst])
def test_get_referents():
class X(object):
__slots__ = ['stuff']
x1 = X()
x1.stuff = X()
x2 = X()
lst = rgc.get_rpy_referents(rgc.cast_instance_to_gcref(x1))
lst2 = [rgc.try_cast_gcref_to_instance(X, x) for x in lst]
assert x1.stuff in lst2
assert x2 not in lst2
def fn():
s = lltype.malloc(S)
s.u = lltype.malloc(U)
gcref1 = lltype.cast_opaque_ptr(llmemory.GCREF, s)
gcref2 = lltype.cast_opaque_ptr(llmemory.GCREF, s.u)
lst = rgc.get_rpy_referents(gcref1)
assert gcref2 in lst
assert gcref1 not in lst
s.u.x = 42
return 0
def fn():
s = lltype.malloc(S)
s.u = lltype.malloc(U)
gcref1 = lltype.cast_opaque_ptr(llmemory.GCREF, s)
gcref2 = lltype.cast_opaque_ptr(llmemory.GCREF, s.u)
lst = rgc.get_rpy_referents(gcref1)
assert gcref2 in lst
assert gcref1 not in lst
s.u.x = 42
return 0
def test_get_referents():
class X(object):
__slots__ = ['stuff']
x1 = X()
x1.stuff = X()
x2 = X()
lst = rgc.get_rpy_referents(rgc.cast_instance_to_gcref(x1))
lst2 = [rgc.try_cast_gcref_to_instance(X, x) for x in lst]
assert x1.stuff in lst2
assert x2 not in lst2
def _list_w_obj_referents(gcref, result_w):
# Get all W_Root reachable directly from gcref, and add them to
# the list 'result_w'. The logic here is not robust against gc
# moves, and may return the same object several times.
seen = {} # map {current_addr: obj}
pending = [gcref]
i = 0
while i < len(pending):
gcrefparent = pending[i]
i += 1
for gcref in rgc.get_rpy_referents(gcrefparent):
key = rgc.cast_gcref_to_int(gcref)
if gcref == seen.get(key, rgc.NULL_GCREF):
continue # already in 'seen'
seen[key] = gcref
w_obj = try_cast_gcref_to_w_root(gcref)
if w_obj is not None:
result_w.append(w_obj)
else:
pending.append(gcref)