def _switch(h):
# No shadowstack manipulation here (no usage of gc references)
sscopy = sscopy_detach_shadow_stack()
gcrootfinder.sscopy = sscopy
if not sscopy:
return _c.null_handle
h = _c.switch(h)
sscopy_attach_shadow_stack(sscopy)
return h
def _switch(h):
# No shadowstack manipulation here (no usage of gc references)
sscopy = sscopy_detach_shadow_stack()
gcrootfinder.sscopy = sscopy
if not sscopy:
return _c.null_handle
h = _c.switch(h)
sscopy_attach_shadow_stack(sscopy)
return h
def switch(suspstack):
# suspstack has a handle to target, i.e. where to switch to
ll_assert(suspstack != gcrootfinder.oldsuspstack,
"stacklet: invalid use")
gcrootfinder.newsuspstack = suspstack
h = llop.gc_shadowstackref_context(llmemory.Address, suspstack)
h = llmemory.cast_adr_to_ptr(h, _c.handle)
prepare_old_suspstack()
h = _c.switch(h)
return get_result_suspstack(h)
def _switch_callback():
# Here, we just closed the stack. Get the stack anchor, store
# it in the gcrootfinder.suspstack.anchor, and switch to this
# suspstack with stacklet_switch(). If this call fails, then we
# are just returning NULL.
oldanchor = gcrootfinder.suspstack.anchor
_stack_just_closed()
h = _consume_suspstack(gcrootfinder.suspstack)
#
# gcrootfinder.suspstack.anchor is left with the anchor of the
# previous place (i.e. before the call to switch()).
h2 = _c.switch(h)
#
if not h2: # MemoryError: restore
gcrootfinder.suspstack.anchor = oldanchor
gcrootfinder.suspstack.handle = h
return h2
def _switch_callback():
# Here, we just closed the stack. Get the stack anchor, store
# it in the gcrootfinder.suspstack.anchor, and switch to this
# suspstack with stacklet_switch(). If this call fails, then we
# are just returning NULL.
oldanchor = gcrootfinder.suspstack.anchor
_stack_just_closed()
h = _consume_suspstack(gcrootfinder.suspstack)
#
# gcrootfinder.suspstack.anchor is left with the anchor of the
# previous place (i.e. before the call to switch()).
h2 = _c.switch(h)
#
if not h2: # MemoryError: restore
gcrootfinder.suspstack.anchor = oldanchor
gcrootfinder.suspstack.handle = h
return h2
def f():
switch(rffi.cast(handle, 0))
def f():
switch(rffi.cast(handle, 0))
def switch(h):
h = _c.switch(h)
if not h:
raise MemoryError
return h
def switch(h):
h = _c.switch(h)
if not h:
raise MemoryError
return h
