def test_unreachable_jumps():
start_ast = [
parser.LabelStmt("start"),
parser.AssignOp(src="inbox", dst="emp"),
parser.JumpOp("label_a"),
parser.LabelStmt("label_a"),
parser.JumpOp("label_b"),
parser.LabelStmt("label_b"),
parser.JumpOp("label_c"),
parser.LabelStmt("label_c"),
parser.JumpOp("label_z"),
parser.JumpOp("start"),
parser.LabelStmt("label_z")
]
expected_ast = [
parser.AssignOp(src="inbox", dst="emp"),
# the indented part is needed in this test.
# when run from `hrmc`, it'd be optimized
# because of the previous 'jump compression' optimization,
# but we are not using an optimized ast here.
parser.JumpOp("label_a"),
parser.LabelStmt("label_a"),
parser.JumpOp("label_b"),
parser.LabelStmt("label_b"),
parser.JumpOp("label_c"),
parser.LabelStmt("label_c"),
parser.JumpOp("_hrm_unreachable"),
parser.LabelStmt("_hrm_unreachable")
]
ast = remove_unreachable_code(start_ast)
assert ast == expected_ast
def test_convert_jmpthenlabel_check():
code = [
p.LabelStmt("alreadySorted"),
p.AssignOp(src="inbox", dst="emp"),
p.IfOp("neg", [p.JumpOp("alreadySorted")], []),
p.IfOp("ez", [p.JumpOp("alreadySorted")],
[p.AssignOp(src="0", dst="emp")])
]
expected_ast = [
p.LabelStmt("alreadySorted"),
p.AssignOp(src="inbox", dst="emp"),
p.JumpCondOp(condition="jneg", label_name="alreadySorted"),
# pass
# p.JumpOp("_hrm_endif_1"),
# p.LabelStmt("_hrm_endif_1"),
p.JumpCondOp(condition="jez", label_name="alreadySorted"),
p.AssignOp(src="0", dst="emp")
# p.JumpOp("_hrm_unreachable"),
# p.LabelStmt("_hrm_unreachable")
]
result_ast = conversion.convert_ifnz_to_ifez(code)
result_ast = conversion.convert_iftojump(result_ast)
result_ast = conversion.compress_jumps(result_ast)
result_ast = conversion.remove_unreachable_code(result_ast)
ast = conversion.fix_jmp_then_label(result_ast)
assert ast == expected_ast
def test_no_duplicated_labels_on_same_point():
start_ast = [
parser.AssignOp(src="inbox", dst="emp"),
parser.JumpOp("skip"),
parser.LabelStmt("comehere"),
parser.OutboxOp(),
parser.LabelStmt("skip"),
parser.JumpOp("comehere")
]
ast = remove_unreachable_code(start_ast)
comehere_counter = sum(1 for ast_item in ast \
if type(ast_item) == parser.LabelStmt \
and ast_item.label_name == "comehere")
assert comehere_counter == 1
start_ast = [
parser.AssignOp(src="inbox", dst="emp"),
parser.JumpOp("comehere"),
parser.LabelStmt("comehere"),
parser.OutboxOp(),
parser.LabelStmt("skip"),
parser.JumpOp("comehere")
]
ast = remove_unreachable_code(start_ast)
comehere_counter = sum(1 for ast_item in ast \
if type(ast_item) == parser.LabelStmt \
and ast_item.label_name == "comehere")
assert comehere_counter == 1
start_ast = [
parser.AssignOp(src="inbox", dst="emp"),
parser.JumpCondOp("comehere", "jez"),
parser.JumpOp("comehere"),
parser.LabelStmt("comehere"),
parser.OutboxOp(),
parser.LabelStmt("skip"),
parser.JumpOp("comehere")
]
ast = remove_unreachable_code(start_ast)
comehere_counter = sum(1 for ast_item in ast \
if type(ast_item) == parser.LabelStmt \
and ast_item.label_name == "comehere")
assert comehere_counter == 1
def test_dont_optimize_jumps_2():
start_ast = [
parser.JumpOp(label_name="start"),
parser.LabelStmt("start"),
parser.AssignOp(src="inbox", dst="emp"),
parser.JumpOp("start")
]
ast = remove_unreachable_code(start_ast)
assert ast == start_ast
def test_endless_program_1():
start_ast = [
parser.LabelStmt("label"),
parser.AssignOp("inbox", "emp"),
parser.JumpOp("label")
]
ast = remove_unreachable_code(start_ast)
assert start_ast == ast
def test_still_reachable():
start_ast = [
parser.JumpOp("skip"),
parser.LabelStmt("ahah"),
parser.OutboxOp(),
parser.LabelStmt("skip"),
parser.JumpOp("ahah")
]
ast = remove_unreachable_code(start_ast)
assert ast == start_ast
def test_jcond_no_jump_in_false():
start_ast = [
parser.AssignOp("inbox", "emp"),
parser.JumpCondOp(condition="ez", label_name="truebranch"),
parser.OutboxOp(),
parser.LabelStmt("truebranch"),
parser.AddOp("tmp")
]
ast = remove_unreachable_code(start_ast)
assert ast == start_ast
def test_no_operation_ignored_in_nonlooping_code():
start_ast = [
parser.JumpCondOp("_hrm_1", "jez"),
parser.IncrOp("a_field"),
parser.JumpOp("the_fence"),
parser.LabelStmt("_hrm_1"),
parser.IncrOp("b_field"),
parser.LabelStmt("the_fence"),
parser.IncrOp("c_field")
]
ast = remove_unreachable_code(start_ast)
assert parser.IncrOp("b_field") in start_ast
assert parser.IncrOp("b_field") in ast
def test_dont_keep_only_last_label_on_instruction():
start_ast = [
parser.AssignOp(src='inbox', dst='emp'),
parser.JumpCondOp(label_name='_hrm_1', condition='jez'),
parser.OutboxOp(),
parser.JumpOp(label_name="_hrm_endif_1"),
parser.LabelStmt("_hrm_1"),
parser.LabelStmt("_hrm_endif_1"),
parser.AssignOp(src="inbox", dst="emp")
]
ast = remove_unreachable_code(start_ast)
assert parser.LabelStmt("_hrm_endif_1") in ast
assert parser.LabelStmt("_hrm_1") in ast
def test_dont_remove_series_of_jumps():
start_ast = [
parser.JumpOp("jump1"),
parser.LabelStmt("jump1"),
parser.JumpOp("jump2"),
parser.LabelStmt("jump2"),
parser.JumpOp("jump3"),
parser.LabelStmt("jump3"),
parser.JumpOp("jump4"),
parser.LabelStmt("jump4"),
parser.AssignOp("inbox", "emp")
]
ast = remove_unreachable_code(start_ast)
assert ast == start_ast
def test_unreachable_condjumps():
start_ast = [
parser.AssignOp(src="inbox", dst="emp"),
parser.JumpCondOp("_hrm_1", "jez"),
parser.OutboxOp(),
parser.LabelStmt("_hrm_1"),
parser.LabelStmt("_hrm_endif_1")
]
expected_ast = [
parser.AssignOp(src="inbox", dst="emp"),
parser.JumpCondOp("_hrm_unreachable", "jez"),
parser.OutboxOp(),
parser.LabelStmt("_hrm_unreachable")
]
ast = remove_unreachable_code(start_ast)
assert ast == expected_ast
def test_skip_operation():
start_ast = [
parser.AssignOp("inbox", "emp"),
parser.JumpOp("label"),
parser.OutboxOp(),
parser.LabelStmt("label"),
parser.AddOp("tmp")
]
expected_ast = [
parser.AssignOp("inbox", "emp"),
parser.JumpOp("label"),
parser.LabelStmt("label"),
parser.AddOp("tmp")
]
ast = remove_unreachable_code(start_ast)
assert ast == expected_ast
def calculate_optimized_ast(fhandle, args):
result_ast = p.parse_it(fhandle)
checker.perform_label_checks(result_ast)
checker.perform_variable_checks(result_ast)
result_ast = conversion.convert_ifnz_to_ifez(result_ast)
result_ast = conversion.convert_iftojump(result_ast)
if not args.no_jump_compression:
result_ast = conversion.compress_jumps(result_ast)
if not args.no_unreachable:
result_ast = conversion.remove_unreachable_code(result_ast)
if not args.no_jmp_then_label:
unchanged = False
while not unchanged:
new_ast = conversion.fix_jmp_then_label(result_ast)
unchanged = new_ast == result_ast
result_ast = new_ast
return result_ast
def test_unreachable_jump_to_lone_label_in_jcond_false_path():
start_ast = [
parser.LabelStmt("start"),
parser.AssignOp(src="inbox", dst="emp"),
parser.JumpCondOp(condition="ez", label_name="isZero"),
parser.JumpOp("loneLabel"),
parser.LabelStmt("isZero"),
parser.OutboxOp(),
parser.JumpOp("start"),
parser.LabelStmt("loneLabel")
]
expected_ast = [
parser.LabelStmt("start"),
parser.AssignOp(src="inbox", dst="emp"),
parser.JumpCondOp(condition="ez", label_name="isZero"),
parser.JumpOp("_hrm_unreachable"),
parser.LabelStmt("isZero"),
parser.OutboxOp(),
parser.JumpOp("start"),
parser.LabelStmt("_hrm_unreachable")
]
ast = remove_unreachable_code(start_ast)
assert ast == expected_ast
def test_single_operation():
start_ast = [parser.OutboxOp()]
ast = remove_unreachable_code(start_ast)
assert start_ast == ast