def test_nclc_nongc_not_passed_on():
# +--- inputargs: pointer_to_gc
# | v0 <- op_getsubstruct pointer_to_gc 'b'
# +--- exitargs: pointer_to_gc (i.e. the pointer to non-gc doesn't leave the block)
llops = LowLevelOpList()
ptr_a = varoftype(lltype.Ptr(GcA))
v_res = llops.genop("getsubstruct", [ptr_a, model.Constant('b', lltype.Void)],
resulttype=lltype.Ptr(NonGcB))
block = model.Block([ptr_a])
block.operations.extend(llops)
block.closeblock(model.Link([ptr_a], None))
assert not needs_conservative_livevar_calculation(block)
def test_nclc_should_be_true():
# this is testing a block like:
# +--- inputargs: pointer_to_gc
# | v0 <- op_getsubstruct pointer_to_gc 'b'
# +--- exitargs: v0 (i.e. pointer to non-gc)
llops = LowLevelOpList()
ptr_a = varoftype(lltype.Ptr(GcA))
v_res = llops.genop("getsubstruct", [ptr_a, model.Constant('b', lltype.Void)],
resulttype=lltype.Ptr(NonGcB))
block = model.Block([ptr_a])
block.operations.extend(llops)
block.closeblock(model.Link([v_res], None))
assert needs_conservative_livevar_calculation(block)
def test_nclc_ignore_functype():
# +--- inputargs: pointer_to_gc
# | v0 <- op_getfield pointer_to_gc 'c'
# +--- exitargs: v0 (i.e. a pointer to function)
# pointers to functions are 'not gc' but functions are also
# immortal so you don't need to muck around inserting keepalives
# so *they* don't die!
llops = LowLevelOpList()
ptr_a = varoftype(lltype.Ptr(GcA))
v_res = llops.genop("getfield", [ptr_a, model.Constant('c', lltype.Void)],
resulttype=GcA.c)
block = model.Block([ptr_a])
block.operations.extend(llops)
block.closeblock(model.Link([v_res], None))
assert not needs_conservative_livevar_calculation(block)