def try_cast_gcref_to_instance(Class, gcref):
# Before translation, unwraps the RPython instance contained in a _GcRef.
# After translation, it is a type-check performed by the GC.
if we_are_translated():
from rpython.rtyper.lltypesystem.rclass import OBJECTPTR
from rpython.rtyper.annlowlevel import cast_base_ptr_to_instance
from rpython.rtyper.lltypesystem import rclass
if _is_rpy_instance(gcref):
objptr = lltype.cast_opaque_ptr(OBJECTPTR, gcref)
if objptr.typeptr: # may be NULL, e.g. in rdict's dummykeyobj
clsptr = _get_llcls_from_cls(Class)
if rclass.ll_isinstance(objptr, clsptr):
return cast_base_ptr_to_instance(Class, objptr)
return None
else:
if isinstance(gcref._x, Class):
return gcref._x
return None
def instanceOf(self, instbox, clsbox):
adr = clsbox.getaddr()
bounding_class = llmemory.cast_adr_to_ptr(adr, rclass.CLASSTYPE)
real_instance = instbox.getref(rclass.OBJECTPTR)
return rclass.ll_isinstance(real_instance, bounding_class)
