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from rpython.rlib import rgc
from rpython.rlib.rweaklist import RWeakListMixin
from rpython.rtyper.lltypesystem import lltype, llmemory, rffi
class HideRevealRWeakList:
"""Slow implementation of HideReveal: uses a RWeakListMixin."""
def __init__(self):
class GlobGcrefs(RWeakListMixin):
pass
glob_gcrefs = GlobGcrefs()
glob_gcrefs.initialize()
def hide_object(PTR, obj):
# XXX leaks if we call this function often on the same object
index = glob_gcrefs.add_handle(obj)
return rffi.cast(PTR, index + 1)
def reveal_object(Class, addr):
index = rffi.cast(lltype.Signed, addr) - 1
return glob_gcrefs.fetch_handle(index)
self.hide_object = hide_object
self.reveal_object = reveal_object
def _freeze_(self):
return True
class HideRevealCast:
"""Fast implementation of HideReveal: just a cast."""
def __init__(self):
def hide_object(PTR, obj):
gcref = rgc.cast_instance_to_gcref(obj)
raw = rgc.hide_nonmovable_gcref(gcref)
return rffi.cast(PTR, raw)
def reveal_object(Class, raw_ptr):
addr = rffi.cast(llmemory.Address, raw_ptr)
gcref = rgc.reveal_gcref(addr)
return rgc.try_cast_gcref_to_instance(Class, gcref)
self.hide_object = hide_object
self.reveal_object = reveal_object
def _freeze_(self):
return True
def make_hide_reveal():
hide_reveal_slow = HideRevealRWeakList()
hide_reveal_fast = HideRevealCast()
def hide_reveal():
if rgc.must_split_gc_address_space():
return hide_reveal_slow
else:
return hide_reveal_fast
return hide_reveal
hide_reveal1 = make_hide_reveal() # for ccallback.py
hide_reveal2 = make_hide_reveal() # for handles.py
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