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test_reducible_check.py
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test_reducible_check.py
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from typing import Mapping, Sequence, cast
from abc_cfg import compute_cfg_from_all_succs, is_reducible
import syntax
import source
import pytest
# global variables are bad :(
syntax.set_arch('rv64')
@pytest.mark.parametrize("all_succs", [
{"_start": ["if_cond"], "if_cond": ["if_then", "if_else"], "if_then": [
"if_join"], "if_else": ["if_join"], "if_join": []}, # diamond
{
"_start": ["for_cond"],
"for_cond": ["for_body", "for_join"], # loop header
"for_body": ["for_step"],
"for_step": ["for_cond"],
"for_join": [],
},
# small infinite loop
{"_start": ["a"], "a": ["b"], "b": ["a"]},
# nested loop
{
"_start": ["outer_for_cond"],
"outer_for_cond": ["outer_for_body", "outer_for_join"],
"outer_for_body": ["inner_for_cond"],
"inner_for_cond": ["inner_for_body", "inner_for_join"],
"inner_for_body": ["inner_for_step"],
"inner_for_step": ["inner_for_cond"],
"inner_for_join": ["outer_for_step"],
"outer_for_step": ["outer_for_cond"],
"outer_for_join": [],
},
# sequential loops
{
"_start": ["for1_cond"],
"for1_cond": ["for1_body", "for1_join"], # loop header
"for1_body": ["for1_step"],
"for1_step": ["for1_cond"],
"for1_join": ["for2_cond"],
"for2_cond": ["for2_body", "for2_join"], # loop header
"for2_body": ["for2_step"],
"for2_step": ["for2_cond"],
"for2_join": [],
},
# self loop
{
"_start": ["loop_header_and_latch"],
"loop_header_and_latch": ["loop_header_and_latch", "exit"],
"exit": []
},
# single loop break
# for (; cond1; step) { if (cond2) break; }
{
"_start": ["for_cond"],
"for_cond": ["for_body", "for_join"],
"for_body": ["for_body_if_cond"],
"for_body_if_cond": ["for_body_if_then", "for_body_if_join"],
"for_body_if_then": ["for_join"],
"for_body_if_join": ["for_step"],
"for_step": ["for_cond"],
"for_join": []
},
# TODO: continue
# for (; cond1; step) { if (cond2) continue; }
{
"_start": ["for_cond"],
"for_cond": ["for_body", "for_join"],
"for_body": ["for_body_if_cond"],
"for_body_if_cond": ["for_body_if_then", "for_body_if_join"],
"for_body_if_then": ["for_body_if_join"],
"for_body_if_join": ["for_step"],
"for_step": ["for_cond"],
"for_join": []
},
# weird example that still forms one loop!
{
"_start": ["for_cond"],
"for_cond": ["for_body", "for_join"],
"for_body": ["for_cond"],
"for_join": ["nasty_jump"],
"nasty_jump": ["for_body"],
},
# inner loop breaks to outer loop body
{
"_start": ["outer_for_cond"],
"outer_for_cond": ["outer_for_body", "outer_for_join"],
"outer_for_body": ["inner_for_cond"],
"inner_for_cond": ["inner_for_body", "inner_for_join"],
"inner_for_body": ["inner_for_body_if_cond"],
"inner_for_body_if_cond": ["inner_for_body_if_then", "inner_for_body_if_join"],
"inner_for_body_if_then": ["inner_for_join"], # break
"inner_for_body_if_join": ["inner_for_step"],
"inner_for_step": ["inner_for_cond"],
"inner_for_join": ["outer_for_step"],
"outer_for_step": ["outer_for_cond"],
"outer_for_join": [],
},
# inner loop breaks out of both loops
{
"_start": ["outer_for_cond"],
"outer_for_cond": ["outer_for_body", "outer_for_join"],
"outer_for_body": ["inner_for_cond"],
"inner_for_cond": ["inner_for_body", "inner_for_join"],
"inner_for_body": ["inner_for_body_if_cond"],
"inner_for_body_if_cond": ["inner_for_body_if_then", "inner_for_body_if_join"],
"inner_for_body_if_then": ["outer_for_join"], # break
"inner_for_body_if_join": ["inner_for_step"],
"inner_for_step": ["inner_for_cond"],
"inner_for_join": ["outer_for_step"],
"outer_for_step": ["outer_for_cond"],
"outer_for_join": [],
},
])
def test_is_reducible(all_succs: Mapping[source.NodeName, Sequence[source.NodeName]]) -> None:
assert is_reducible(compute_cfg_from_all_succs(
all_succs, source.NodeName("_start")))
@pytest.mark.parametrize("all_succs", [
# textbook example
{
"_start": ["A", "B"],
"A": ["B"],
"B": ["A"],
},
# skip loop header
{
"_start": ["normal", "skipper"],
"skipper": ["for_body"],
"normal": ["for_cond"],
"for_cond": ["for_body", "for_join"],
"for_body": ["for_cond"],
"for_join": []
},
# jump between loop bodies (ie skip the second loop header)
# sequential loops
{
"_start": ["for1_cond"],
"for1_cond": ["for1_body", "for1_join"], # loop header
"for1_body": ["for1_step", "for2_body"],
"for1_step": ["for1_cond"],
"for1_join": ["for2_cond"],
"for2_cond": ["for2_body", "for2_join"], # loop header
"for2_body": ["for2_step"],
"for2_step": ["for2_cond"],
"for2_join": [],
},
# jump to header of inner loop from outside both loop
{
"_start": ["outer_for_cond", "skipper"],
"skipper": ["inner_for_cond"],
"outer_for_cond": ["outer_for_body", "outer_for_join"],
"outer_for_body": ["inner_for_cond"],
"inner_for_cond": ["inner_for_body", "inner_for_join"],
"inner_for_body": ["inner_for_step"],
"inner_for_step": ["inner_for_cond"],
"inner_for_join": ["outer_for_step"],
"outer_for_step": ["outer_for_cond"],
"outer_for_join": [],
},
# skip inner loop header, from outer loop body
{
"_start": ["outer_for_cond"],
"outer_for_cond": ["outer_for_body", "outer_for_join"],
# if we just have a jump to the inner for body, it's equivalent to a
# do while loop
"outer_for_body": ["inner_for_body", "inner_for_cond"],
"inner_for_cond": ["inner_for_body", "inner_for_join"],
"inner_for_body": ["inner_for_step"],
"inner_for_step": ["inner_for_cond"],
"inner_for_join": ["outer_for_step"],
"outer_for_step": ["outer_for_cond"],
"outer_for_join": [],
},
])
def test_is_not_reducible(all_succs: Mapping[source.NodeName, Sequence[source.NodeName]]) -> None:
assert not is_reducible(
compute_cfg_from_all_succs(all_succs, source.NodeName("_start")))
with open('examples/kernel_CFunctions.txt') as f:
kernel_C = syntax.parse_and_install_all(f, None)
@pytest.mark.slow
@pytest.mark.parametrize('unsafe_func', (f for f in kernel_C[1].values() if f.entry is not None))
def test_kernel_functions_all_reducible(unsafe_func: syntax.Function) -> None:
""" we haven't checked manually """
func = source.convert_function(unsafe_func)
assert is_reducible(func.cfg)
if __name__ == "__main__":
from dot_graph import viz_successor_graph
viz_successor_graph({
"_start": ["outer_for_cond"],
"outer_for_cond": ["outer_for_body", "outer_for_join"],
"outer_for_body": ["inner_for_body"],
"inner_for_cond": ["inner_for_body", "inner_for_join"],
"inner_for_body": ["inner_for_step"],
"inner_for_step": ["inner_for_cond"],
"inner_for_join": ["outer_for_step"],
"outer_for_step": ["outer_for_cond"],
"outer_for_join": [],
})