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from rpython.jit.metainterp.heapcache import HeapCache
from rpython.jit.metainterp.resoperation import rop
from rpython.jit.metainterp.history import ConstInt, BoxInt, BasicFailDescr
box1 = "box1"
box2 = "box2"
box3 = "box3"
box4 = "box4"
box5 = "box5"
lengthbox1 = object()
lengthbox2 = object()
lengthbox3 = object()
descr1 = object()
descr2 = object()
descr3 = object()
index1 = ConstInt(0)
index2 = ConstInt(1)
class FakeEffectinfo(object):
EF_ELIDABLE_CANNOT_RAISE = 0 #elidable function (and cannot raise)
EF_LOOPINVARIANT = 1 #special: call it only once per loop
EF_CANNOT_RAISE = 2 #a function which cannot raise
EF_ELIDABLE_CAN_RAISE = 3 #elidable function (but can raise)
EF_CAN_RAISE = 4 #normal function (can raise)
EF_FORCES_VIRTUAL_OR_VIRTUALIZABLE = 5 #can raise and force virtualizables
EF_RANDOM_EFFECTS = 6 #can do whatever
OS_ARRAYCOPY = 0
def __init__(self, extraeffect, oopspecindex, write_descrs_arrays):
self.extraeffect = extraeffect
self.oopspecindex = oopspecindex
self.write_descrs_arrays = write_descrs_arrays
class FakeCallDescr(object):
def __init__(self, extraeffect, oopspecindex=None, write_descrs_arrays=[]):
self.extraeffect = extraeffect
self.oopspecindex = oopspecindex
self.write_descrs_arrays = write_descrs_arrays
def get_extra_info(self):
return FakeEffectinfo(
self.extraeffect, self.oopspecindex,
write_descrs_arrays=self.write_descrs_arrays
)
class TestHeapCache(object):
def test_known_class_box(self):
h = HeapCache()
assert not h.is_class_known(1)
assert not h.is_class_known(2)
h.class_now_known(1)
assert h.is_class_known(1)
assert not h.is_class_known(2)
h.reset()
assert not h.is_class_known(1)
assert not h.is_class_known(2)
def test_nonstandard_virtualizable(self):
h = HeapCache()
assert not h.is_nonstandard_virtualizable(1)
assert not h.is_nonstandard_virtualizable(2)
h.nonstandard_virtualizables_now_known(1)
assert h.is_nonstandard_virtualizable(1)
assert not h.is_nonstandard_virtualizable(2)
h.reset()
assert not h.is_nonstandard_virtualizable(1)
assert not h.is_nonstandard_virtualizable(2)
def test_heapcache_fields(self):
h = HeapCache()
assert h.getfield(box1, descr1) is None
assert h.getfield(box1, descr2) is None
h.setfield(box1, box2, descr1)
assert h.getfield(box1, descr1) is box2
assert h.getfield(box1, descr2) is None
h.setfield(box1, box3, descr2)
assert h.getfield(box1, descr1) is box2
assert h.getfield(box1, descr2) is box3
h.setfield(box1, box3, descr1)
assert h.getfield(box1, descr1) is box3
assert h.getfield(box1, descr2) is box3
h.setfield(box3, box1, descr1)
assert h.getfield(box3, descr1) is box1
assert h.getfield(box1, descr1) is None
assert h.getfield(box1, descr2) is box3
h.reset()
assert h.getfield(box1, descr1) is None
assert h.getfield(box1, descr2) is None
assert h.getfield(box3, descr1) is None
def test_heapcache_read_fields_multiple(self):
h = HeapCache()
h.getfield_now_known(box1, descr1, box2)
h.getfield_now_known(box3, descr1, box4)
assert h.getfield(box1, descr1) is box2
assert h.getfield(box1, descr2) is None
assert h.getfield(box3, descr1) is box4
assert h.getfield(box3, descr2) is None
h.reset()
assert h.getfield(box1, descr1) is None
assert h.getfield(box1, descr2) is None
assert h.getfield(box3, descr1) is None
assert h.getfield(box3, descr2) is None
def test_heapcache_write_fields_multiple(self):
h = HeapCache()
h.setfield(box1, box2, descr1)
assert h.getfield(box1, descr1) is box2
h.setfield(box3, box4, descr1)
assert h.getfield(box3, descr1) is box4
assert h.getfield(box1, descr1) is None # box1 and box3 can alias
h = HeapCache()
h.new(box1)
h.setfield(box1, box2, descr1)
assert h.getfield(box1, descr1) is box2
h.setfield(box3, box4, descr1)
assert h.getfield(box3, descr1) is box4
assert h.getfield(box1, descr1) is None # box1 and box3 can alias
h = HeapCache()
h.new(box1)
h.new(box3)
h.setfield(box1, box2, descr1)
assert h.getfield(box1, descr1) is box2
h.setfield(box3, box4, descr1)
assert h.getfield(box3, descr1) is box4
assert h.getfield(box1, descr1) is box2 # box1 and box3 cannot alias
h.setfield(box1, box3, descr1)
assert h.getfield(box1, descr1) is box3
def test_heapcache_arrays(self):
h = HeapCache()
assert h.getarrayitem(box1, index1, descr1) is None
assert h.getarrayitem(box1, index1, descr2) is None
assert h.getarrayitem(box1, index2, descr1) is None
assert h.getarrayitem(box1, index2, descr2) is None
h.setarrayitem(box1, index1, box2, descr1)
assert h.getarrayitem(box1, index1, descr1) is box2
assert h.getarrayitem(box1, index1, descr2) is None
assert h.getarrayitem(box1, index2, descr1) is None
assert h.getarrayitem(box1, index2, descr2) is None
h.setarrayitem(box1, index2, box4, descr1)
assert h.getarrayitem(box1, index1, descr1) is box2
assert h.getarrayitem(box1, index1, descr2) is None
assert h.getarrayitem(box1, index2, descr1) is box4
assert h.getarrayitem(box1, index2, descr2) is None
h.setarrayitem(box1, index1, box3, descr2)
assert h.getarrayitem(box1, index1, descr1) is box2
assert h.getarrayitem(box1, index1, descr2) is box3
assert h.getarrayitem(box1, index2, descr1) is box4
assert h.getarrayitem(box1, index2, descr2) is None
h.setarrayitem(box1, index1, box3, descr1)
assert h.getarrayitem(box1, index1, descr1) is box3
assert h.getarrayitem(box1, index1, descr2) is box3
assert h.getarrayitem(box1, index2, descr1) is box4
assert h.getarrayitem(box1, index2, descr2) is None
h.setarrayitem(box3, index1, box1, descr1)
assert h.getarrayitem(box3, index1, descr1) is box1
assert h.getarrayitem(box1, index1, descr1) is None
assert h.getarrayitem(box1, index1, descr2) is box3
assert h.getarrayitem(box1, index2, descr1) is box4
assert h.getarrayitem(box1, index2, descr2) is None
h.reset()
assert h.getarrayitem(box1, index1, descr1) is None
assert h.getarrayitem(box1, index1, descr2) is None
assert h.getarrayitem(box3, index1, descr1) is None
def test_heapcache_array_nonconst_index(self):
h = HeapCache()
h.setarrayitem(box1, index1, box2, descr1)
h.setarrayitem(box1, index2, box4, descr1)
assert h.getarrayitem(box1, index1, descr1) is box2
assert h.getarrayitem(box1, index2, descr1) is box4
h.setarrayitem(box1, box2, box3, descr1)
assert h.getarrayitem(box1, index1, descr1) is None
assert h.getarrayitem(box1, index2, descr1) is None
def test_heapcache_read_fields_multiple_array(self):
h = HeapCache()
h.getarrayitem_now_known(box1, index1, box2, descr1)
h.getarrayitem_now_known(box3, index1, box4, descr1)
assert h.getarrayitem(box1, index1, descr1) is box2
assert h.getarrayitem(box1, index1, descr2) is None
assert h.getarrayitem(box3, index1, descr1) is box4
assert h.getarrayitem(box3, index1, descr2) is None
h.reset()
assert h.getarrayitem(box1, index1, descr1) is None
assert h.getarrayitem(box1, index1, descr2) is None
assert h.getarrayitem(box3, index1, descr1) is None
assert h.getarrayitem(box3, index1, descr2) is None
def test_heapcache_write_fields_multiple_array(self):
h = HeapCache()
h.setarrayitem(box1, index1, box2, descr1)
assert h.getarrayitem(box1, index1, descr1) is box2
h.setarrayitem(box3, index1, box4, descr1)
assert h.getarrayitem(box3, index1, descr1) is box4
assert h.getarrayitem(box1, index1, descr1) is None # box1 and box3 can alias
h = HeapCache()
h.new(box1)
h.setarrayitem(box1, index1, box2, descr1)
assert h.getarrayitem(box1, index1, descr1) is box2
h.setarrayitem(box3, index1, box4, descr1)
assert h.getarrayitem(box3, index1, descr1) is box4
assert h.getarrayitem(box1, index1, descr1) is None # box1 and box3 can alias
h = HeapCache()
h.new(box1)
h.new(box3)
h.setarrayitem(box1, index1, box2, descr1)
assert h.getarrayitem(box1, index1, descr1) is box2
h.setarrayitem(box3, index1, box4, descr1)
assert h.getarrayitem(box3, index1, descr1) is box4
assert h.getarrayitem(box1, index1, descr1) is box2 # box1 and box3 cannot alias
h.setarrayitem(box1, index1, box3, descr1)
assert h.getarrayitem(box3, index1, descr1) is box4
assert h.getarrayitem(box1, index1, descr1) is box3 # box1 and box3 cannot alias
def test_length_cache(self):
h = HeapCache()
h.new_array(box1, lengthbox1)
assert h.arraylen(box1) is lengthbox1
assert h.arraylen(box2) is None
h.arraylen_now_known(box2, lengthbox2)
assert h.arraylen(box2) is lengthbox2
def test_invalidate_cache(self):
h = HeapCache()
h.setfield(box1, box2, descr1)
h.setarrayitem(box1, index1, box2, descr1)
h.setarrayitem(box1, index2, box4, descr1)
h.invalidate_caches(rop.INT_ADD, None, [])
h.invalidate_caches(rop.INT_ADD_OVF, None, [])
h.invalidate_caches(rop.SETFIELD_RAW, None, [])
h.invalidate_caches(rop.SETARRAYITEM_RAW, None, [])
assert h.getfield(box1, descr1) is box2
assert h.getarrayitem(box1, index1, descr1) is box2
assert h.getarrayitem(box1, index2, descr1) is box4
h.invalidate_caches(
rop.CALL, FakeCallDescr(FakeEffectinfo.EF_ELIDABLE_CANNOT_RAISE), [])
assert h.getfield(box1, descr1) is box2
assert h.getarrayitem(box1, index1, descr1) is box2
assert h.getarrayitem(box1, index2, descr1) is box4
h.invalidate_caches(rop.GUARD_TRUE, None, [])
assert h.getfield(box1, descr1) is box2
assert h.getarrayitem(box1, index1, descr1) is box2
assert h.getarrayitem(box1, index2, descr1) is box4
h.invalidate_caches(
rop.CALL_LOOPINVARIANT, FakeCallDescr(FakeEffectinfo.EF_LOOPINVARIANT), [])
h.invalidate_caches(
rop.CALL, FakeCallDescr(FakeEffectinfo.EF_RANDOM_EFFECTS), [])
assert h.getfield(box1, descr1) is None
assert h.getarrayitem(box1, index1, descr1) is None
assert h.getarrayitem(box1, index2, descr1) is None
def test_replace_box(self):
h = HeapCache()
h.setfield(box1, box2, descr1)
h.setfield(box1, box3, descr2)
h.setfield(box2, box3, descr3)
h.replace_box(box1, box4)
assert h.getfield(box4, descr1) is box2
assert h.getfield(box4, descr2) is box3
assert h.getfield(box2, descr3) is box3
h.setfield(box4, box3, descr1)
assert h.getfield(box4, descr1) is box3
h = HeapCache()
h.setfield(box1, box2, descr1)
h.setfield(box1, box3, descr2)
h.setfield(box2, box3, descr3)
h.replace_box(box3, box4)
assert h.getfield(box1, descr1) is box2
assert h.getfield(box1, descr2) is box4
assert h.getfield(box2, descr3) is box4
def test_replace_box_twice(self):
h = HeapCache()
h.setfield(box1, box2, descr1)
h.setfield(box1, box3, descr2)
h.setfield(box2, box3, descr3)
h.replace_box(box1, box4)
h.replace_box(box4, box5)
assert h.getfield(box5, descr1) is box2
assert h.getfield(box5, descr2) is box3
assert h.getfield(box2, descr3) is box3
h.setfield(box5, box3, descr1)
assert h.getfield(box4, descr1) is box3
h = HeapCache()
h.setfield(box1, box2, descr1)
h.setfield(box1, box3, descr2)
h.setfield(box2, box3, descr3)
h.replace_box(box3, box4)
h.replace_box(box4, box5)
assert h.getfield(box1, descr1) is box2
assert h.getfield(box1, descr2) is box5
assert h.getfield(box2, descr3) is box5
def test_replace_box_array(self):
h = HeapCache()
h.setarrayitem(box1, index1, box2, descr1)
h.setarrayitem(box1, index1, box3, descr2)
h.arraylen_now_known(box1, lengthbox1)
h.setarrayitem(box2, index2, box1, descr1)
h.setarrayitem(box3, index2, box1, descr2)
h.setarrayitem(box2, index2, box3, descr3)
h.replace_box(box1, box4)
assert h.arraylen(box4) is lengthbox1
assert h.getarrayitem(box4, index1, descr1) is box2
assert h.getarrayitem(box4, index1, descr2) is box3
assert h.getarrayitem(box2, index2, descr1) is box4
assert h.getarrayitem(box3, index2, descr2) is box4
assert h.getarrayitem(box2, index2, descr3) is box3
h.replace_box(lengthbox1, lengthbox2)
assert h.arraylen(box4) is lengthbox2
def test_replace_box_array_twice(self):
h = HeapCache()
h.setarrayitem(box1, index1, box2, descr1)
h.setarrayitem(box1, index1, box3, descr2)
h.arraylen_now_known(box1, lengthbox1)
h.setarrayitem(box2, index2, box1, descr1)
h.setarrayitem(box3, index2, box1, descr2)
h.setarrayitem(box2, index2, box3, descr3)
h.replace_box(box1, box4)
h.replace_box(box4, box5)
assert h.arraylen(box4) is lengthbox1
assert h.getarrayitem(box5, index1, descr1) is box2
assert h.getarrayitem(box5, index1, descr2) is box3
assert h.getarrayitem(box2, index2, descr1) is box5
assert h.getarrayitem(box3, index2, descr2) is box5
assert h.getarrayitem(box2, index2, descr3) is box3
h.replace_box(lengthbox1, lengthbox2)
h.replace_box(lengthbox2, lengthbox3)
assert h.arraylen(box4) is lengthbox3
def test_ll_arraycopy(self):
h = HeapCache()
h.new_array(box1, lengthbox1)
h.setarrayitem(box1, index1, box2, descr1)
h.new_array(box2, lengthbox1)
# Just need the destination box for this call
h.invalidate_caches(
rop.CALL,
FakeCallDescr(FakeEffectinfo.EF_CANNOT_RAISE, FakeEffectinfo.OS_ARRAYCOPY, write_descrs_arrays=[descr1]),
[None, box5, box2, index1, index1, index1]
)
assert h.getarrayitem(box1, index1, descr1) is box2
h.invalidate_caches(
rop.CALL,
FakeCallDescr(FakeEffectinfo.EF_CANNOT_RAISE, FakeEffectinfo.OS_ARRAYCOPY, write_descrs_arrays=[descr1]),
[None, box5, box3, index1, index1, index1]
)
assert h.getarrayitem(box1, index1, descr1) is box2
h.setarrayitem(box4, index1, box2, descr1)
assert h.getarrayitem(box4, index1, descr1) is box2
h.invalidate_caches(
rop.CALL,
FakeCallDescr(FakeEffectinfo.EF_CANNOT_RAISE, FakeEffectinfo.OS_ARRAYCOPY, write_descrs_arrays=[descr1]),
[None, box3, box5, index1, index1, index2]
)
assert h.getarrayitem(box4, index1, descr1) is None
def test_ll_arraycopy_differing_descrs(self):
h = HeapCache()
h.setarrayitem(box1, index1, box2, descr1)
assert h.getarrayitem(box1, index1, descr1) is box2
h.new_array(box2, lengthbox2)
h.invalidate_caches(
rop.CALL,
FakeCallDescr(FakeEffectinfo.EF_CANNOT_RAISE, FakeEffectinfo.OS_ARRAYCOPY, write_descrs_arrays=[descr2]),
[None, box3, box2, index1, index1, index2]
)
assert h.getarrayitem(box1, index1, descr1) is box2
def test_ll_arraycopy_result_propogated(self):
h = HeapCache()
h.setarrayitem(box1, index1, box2, descr1)
h.invalidate_caches(
rop.CALL,
FakeCallDescr(FakeEffectinfo.EF_CANNOT_RAISE, FakeEffectinfo.OS_ARRAYCOPY, write_descrs_arrays=[descr1]),
[None, box1, box3, index1, index1, index2]
)
assert h.getarrayitem(box3, index1, descr1) is box2
def test_ll_arraycopy_dest_new(self):
h = HeapCache()
h.new_array(box1, lengthbox1)
h.setarrayitem(box3, index1, box4, descr1)
h.invalidate_caches(
rop.CALL,
FakeCallDescr(FakeEffectinfo.EF_CANNOT_RAISE, FakeEffectinfo.OS_ARRAYCOPY, write_descrs_arrays=[descr1]),
[None, box2, box1, index1, index1, index2]
)
def test_ll_arraycopy_doesnt_escape_arrays(self):
h = HeapCache()
h.new_array(box1, lengthbox1)
h.new_array(box2, lengthbox2)
h.invalidate_caches(
rop.CALL,
FakeCallDescr(FakeEffectinfo.EF_CANNOT_RAISE, FakeEffectinfo.OS_ARRAYCOPY, write_descrs_arrays=[descr1]),
[None, box2, box1, index1, index1, index2]
)
assert h.is_unescaped(box1)
assert h.is_unescaped(box2)
h.invalidate_caches(
rop.CALL,
FakeCallDescr(FakeEffectinfo.EF_CANNOT_RAISE, FakeEffectinfo.OS_ARRAYCOPY, write_descrs_arrays=[descr1]),
[None, box2, box1, index1, index1, BoxInt()]
)
assert not h.is_unescaped(box1)
assert not h.is_unescaped(box2)
def test_unescaped(self):
h = HeapCache()
assert not h.is_unescaped(box1)
h.new(box2)
assert h.is_unescaped(box2)
h.invalidate_caches(rop.SETFIELD_GC, None, [box2, box1])
assert h.is_unescaped(box2)
h.invalidate_caches(rop.SETFIELD_GC, None, [box1, box2])
assert not h.is_unescaped(box2)
def test_unescaped_testing(self):
h = HeapCache()
h.new(box1)
h.new(box2)
assert h.is_unescaped(box1)
assert h.is_unescaped(box2)
# Putting a virtual inside of another virtual doesn't escape it.
h.invalidate_caches(rop.SETFIELD_GC, None, [box1, box2])
assert h.is_unescaped(box2)
# Reading a field from a virtual doesn't escape it.
h.invalidate_caches(rop.GETFIELD_GC, None, [box1])
assert h.is_unescaped(box1)
# Escaping a virtual transitively escapes anything inside of it.
assert not h.is_unescaped(box3)
h.invalidate_caches(rop.SETFIELD_GC, None, [box3, box1])
assert not h.is_unescaped(box1)
assert not h.is_unescaped(box2)
def test_ops_dont_escape(self):
h = HeapCache()
h.new(box1)
h.new(box2)
assert h.is_unescaped(box1)
assert h.is_unescaped(box2)
h.invalidate_caches(rop.INSTANCE_PTR_EQ, None, [box1, box2])
assert h.is_unescaped(box1)
assert h.is_unescaped(box2)
h.invalidate_caches(rop.INSTANCE_PTR_NE, None, [box1, box2])
assert h.is_unescaped(box1)
assert h.is_unescaped(box2)
def test_circular_virtuals(self):
h = HeapCache()
h.new(box1)
h.new(box2)
h.invalidate_caches(rop.SETFIELD_GC, None, [box1, box2])
h.invalidate_caches(rop.SETFIELD_GC, None, [box2, box1])
h.invalidate_caches(rop.SETFIELD_GC, None, [box3, box1]) # does not crash
def test_unescaped_array(self):
h = HeapCache()
h.new_array(box1, lengthbox1)
assert h.is_unescaped(box1)
h.invalidate_caches(rop.SETARRAYITEM_GC, None, [box1, index1, box2])
assert h.is_unescaped(box1)
h.invalidate_caches(rop.SETARRAYITEM_GC, None, [box2, index1, box1])
assert not h.is_unescaped(box1)
h = HeapCache()
h.new_array(box1, lengthbox1)
h.new(box2)
assert h.is_unescaped(box1)
assert h.is_unescaped(box2)
h.invalidate_caches(rop.SETARRAYITEM_GC, None, [box1, lengthbox2, box2])
assert h.is_unescaped(box1)
assert h.is_unescaped(box2)
h.invalidate_caches(
rop.CALL, FakeCallDescr(FakeEffectinfo.EF_RANDOM_EFFECTS), [box1]
)
assert not h.is_unescaped(box1)
assert not h.is_unescaped(box2)
def test_call_doesnt_invalidate_unescaped_boxes(self):
h = HeapCache()
h.new(box1)
assert h.is_unescaped(box1)
h.setfield(box1, box2, descr1)
h.invalidate_caches(rop.CALL,
FakeCallDescr(FakeEffectinfo.EF_CAN_RAISE),
[]
)
assert h.getfield(box1, descr1) is box2
def test_call_doesnt_invalidate_unescaped_array_boxes(self):
h = HeapCache()
h.new_array(box1, lengthbox1)
assert h.is_unescaped(box1)
h.setarrayitem(box1, index1, box3, descr1)
h.invalidate_caches(rop.CALL,
FakeCallDescr(FakeEffectinfo.EF_CAN_RAISE),
[]
)
assert h.getarrayitem(box1, index1, descr1) is box3
def test_bug_missing_ignored_operations(self):
h = HeapCache()
h.new(box1)
h.new(box2)
h.setfield(box1, box2, descr1)
assert h.getfield(box1, descr1) is box2
h.invalidate_caches(rop.STRSETITEM, None, [])
h.invalidate_caches(rop.UNICODESETITEM, None, [])
h.invalidate_caches(rop.SETFIELD_RAW, None, [])
h.invalidate_caches(rop.SETARRAYITEM_RAW, None, [])
h.invalidate_caches(rop.SETINTERIORFIELD_RAW, None, [])
h.invalidate_caches(rop.RAW_STORE, None, [])
assert h.is_unescaped(box1)
assert h.is_unescaped(box2)
assert h.getfield(box1, descr1) is box2
def test_bug_heap_cache_is_cleared_but_not_is_unescaped_1(self):
# bug if only the getfield() link is cleared (heap_cache) but not
# the is_unescaped() flags: we can do later a GETFIELD(box1) which
# will give us a fresh box3, which is actually equal to box2. This
# box3 is escaped, but box2 is still unescaped. Bug shown e.g. by
# calling some residual code that changes the values on box3: then
# the content of box2 is still cached at the old value.
h = HeapCache()
h.new(box1)
h.new(box2)
h.setfield(box1, box2, descr1)
h.invalidate_caches(rop.SETFIELD_GC, None, [box1, box2])
assert h.getfield(box1, descr1) is box2
h.invalidate_caches(rop.CALL_MAY_FORCE, None, [])
assert not h.is_unescaped(box1)
assert not h.is_unescaped(box2)
assert h.getfield(box1, descr1) is None
def test_bug_heap_cache_is_cleared_but_not_is_unescaped_2(self):
h = HeapCache()
h.new(box1)
h.new(box2)
h.setfield(box1, box2, descr1)
h.invalidate_caches(rop.SETFIELD_GC, None, [box1, box2])
assert h.getfield(box1, descr1) is box2
descr = BasicFailDescr()
class XTra:
oopspecindex = 0
OS_ARRAYCOPY = 42
extraeffect = 5
EF_LOOPINVARIANT = 1
EF_ELIDABLE_CANNOT_RAISE = 2
EF_ELIDABLE_CAN_RAISE = 3
descr.get_extra_info = XTra
h.invalidate_caches(rop.CALL, descr, [])
assert h.is_unescaped(box1)
assert h.is_unescaped(box2)
assert h.getfield(box1, descr1) is box2
def test_is_likely_virtual(self):
h = HeapCache()
h.new(box1)
assert h.is_unescaped(box1)
assert h.is_likely_virtual(box1)
h.reset(reset_virtuals=False)
assert not h.is_unescaped(box1)
assert h.is_likely_virtual(box1)
h._escape(box1)
assert not h.is_unescaped(box1)
assert not h.is_likely_virtual(box1)
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