def make_a_copy(self, obj, objsize):
# During a full collect, all copied objects might implicitly come
# from the nursery. If they do, we must add the GCFLAG_NO_YOUNG_PTRS.
# If they don't, we count how many times they are copied and when
# some threshold is reached we make the copy a non-movable "external"
# object. The threshold is MAX_SEMISPACE_AGE.
tid = self.header(obj).tid
# XXX the following logic is not doing exactly what is explained
# above: any object without GCFLAG_NO_YOUNG_PTRS has its age not
# incremented. This is accidental: it means that objects that
# are very often modified to point to young objects don't reach
# the 3rd generation. For now I'll leave it this way because
# I'm not sure that it's a bad thing.
if not (tid & GCFLAG_NO_YOUNG_PTRS):
tid |= GCFLAG_NO_YOUNG_PTRS # object comes from the nursery
elif (tid & GCFLAG_AGE_MASK) < GCFLAG_AGE_MAX:
tid += GCFLAG_AGE_ONE
else:
newobj = self.make_a_nonmoving_copy(obj, objsize)
if newobj:
return newobj
tid &= ~GCFLAG_AGE_MASK
# skip GenerationGC.make_a_copy() as we already did the right
# thing about GCFLAG_NO_YOUNG_PTRS
newobj = SemiSpaceGC.make_a_copy(self, obj, objsize)
self.header(newobj).tid = tid
return newobj
def make_a_copy(self, obj, objsize):
# During a full collect, all copied objects might implicitly come
# from the nursery. If they do, we must add the GCFLAG_NO_YOUNG_PTRS.
# If they don't, we count how many times they are copied and when
# some threshold is reached we make the copy a non-movable "external"
# object. The threshold is MAX_SEMISPACE_AGE.
tid = self.header(obj).tid
# XXX the following logic is not doing exactly what is explained
# above: any object without GCFLAG_NO_YOUNG_PTRS has its age not
# incremented. This is accidental: it means that objects that
# are very often modified to point to young objects don't reach
# the 3rd generation. For now I'll leave it this way because
# I'm not sure that it's a bad thing.
if not (tid & GCFLAG_NO_YOUNG_PTRS):
tid |= GCFLAG_NO_YOUNG_PTRS # object comes from the nursery
elif (tid & GCFLAG_AGE_MASK) < GCFLAG_AGE_MAX:
tid += GCFLAG_AGE_ONE
else:
newobj = self.make_a_nonmoving_copy(obj, objsize)
if newobj:
return newobj
tid &= ~GCFLAG_AGE_MASK
# skip GenerationGC.make_a_copy() as we already did the right
# thing about GCFLAG_NO_YOUNG_PTRS
newobj = SemiSpaceGC.make_a_copy(self, obj, objsize)
self.header(newobj).tid = tid
return newobj
def make_a_copy(self, obj, objsize):
newobj = SemiSpaceGC.make_a_copy(self, obj, objsize)
# During a full collect, all copied objects might implicitly come
# from the nursery. In case they do, we must add this flag:
self.header(newobj).tid |= GCFLAG_NO_YOUNG_PTRS
return newobj
def make_a_copy(self, obj, objsize):
newobj = SemiSpaceGC.make_a_copy(self, obj, objsize)
# During a full collect, all copied objects might implicitly come
# from the nursery. In case they do, we must add this flag:
self.header(newobj).tid |= GCFLAG_NO_YOUNG_PTRS
return newobj
