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# Copyright 2018 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
"""Tests for reaching_definitions module."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from tensorflow.contrib.autograph.pyct import anno
from tensorflow.contrib.autograph.pyct import cfg
from tensorflow.contrib.autograph.pyct import parser
from tensorflow.contrib.autograph.pyct import qual_names
from tensorflow.contrib.autograph.pyct import transformer
from tensorflow.contrib.autograph.pyct.static_analysis import activity
from tensorflow.contrib.autograph.pyct.static_analysis import reaching_definitions
from tensorflow.python.platform import test
class DefinitionInfoTest(test.TestCase):
def _parse_and_analyze(self, test_fn):
node, source = parser.parse_entity(test_fn)
entity_info = transformer.EntityInfo(
source_code=source,
source_file=None,
namespace={},
arg_values=None,
arg_types=None,
owner_type=None)
node = qual_names.resolve(node)
node = activity.resolve(node, entity_info)
graphs = cfg.build(node)
node = reaching_definitions.resolve(node, entity_info, graphs,
reaching_definitions.Definition)
return node
def assertHasDefs(self, node, num):
defs = anno.getanno(node, anno.Static.DEFINITIONS)
self.assertEqual(len(defs), num)
for r in defs:
self.assertIsInstance(r, reaching_definitions.Definition)
def assertHasDefinedIn(self, node, expected):
defined_in = anno.getanno(node, anno.Static.DEFINED_VARS_IN)
defined_in_str = set(str(v) for v in defined_in)
if not expected:
expected = ()
if not isinstance(expected, tuple):
expected = (expected,)
self.assertSetEqual(defined_in_str, set(expected))
def assertSameDef(self, first, second):
self.assertHasDefs(first, 1)
self.assertHasDefs(second, 1)
self.assertIs(
anno.getanno(first, anno.Static.DEFINITIONS)[0],
anno.getanno(second, anno.Static.DEFINITIONS)[0])
def assertNotSameDef(self, first, second):
self.assertHasDefs(first, 1)
self.assertHasDefs(second, 1)
self.assertIsNot(
anno.getanno(first, anno.Static.DEFINITIONS)[0],
anno.getanno(second, anno.Static.DEFINITIONS)[0])
def test_conditional(self):
def test_fn(a, b):
a = []
if b:
a = []
return a
node = self._parse_and_analyze(test_fn)
fn_body = node.body[0].body
self.assertHasDefs(fn_body[0].targets[0], 1)
self.assertHasDefs(fn_body[1].test, 1)
self.assertHasDefs(fn_body[1].body[0].targets[0], 1)
self.assertHasDefs(fn_body[2].value, 2)
self.assertHasDefinedIn(fn_body[1], ('a', 'b'))
def test_while(self):
def test_fn(a):
max(a)
while True:
a = a
a = a
return a
node = self._parse_and_analyze(test_fn)
fn_body = node.body[0].body
self.assertHasDefs(fn_body[0].value.args[0], 1)
self.assertHasDefs(fn_body[1].body[0].targets[0], 1)
self.assertHasDefs(fn_body[1].body[1].targets[0], 1)
self.assertHasDefs(fn_body[1].body[1].value, 1)
# The loop does have an invariant test, but the CFG doesn't know that.
self.assertHasDefs(fn_body[1].body[0].value, 2)
self.assertHasDefs(fn_body[2].value, 2)
def test_while_else(self):
def test_fn(x, i):
y = 0
while x:
x += i
if i:
break
else:
y = 1
return x, y
node = self._parse_and_analyze(test_fn)
fn_body = node.body[0].body
self.assertHasDefs(fn_body[0].targets[0], 1)
self.assertHasDefs(fn_body[1].test, 2)
self.assertHasDefs(fn_body[1].body[0].target, 1)
self.assertHasDefs(fn_body[1].body[1].test, 1)
self.assertHasDefs(fn_body[1].orelse[0].targets[0], 1)
self.assertHasDefs(fn_body[2].value.elts[0], 2)
self.assertHasDefs(fn_body[2].value.elts[1], 2)
def test_for_else(self):
def test_fn(x, i):
y = 0
for i in x:
x += i
if i:
break
else:
continue
else:
y = 1
return x, y
node = self._parse_and_analyze(test_fn)
fn_body = node.body[0].body
self.assertHasDefs(fn_body[0].targets[0], 1)
self.assertHasDefs(fn_body[1].target, 1)
self.assertHasDefs(fn_body[1].body[0].target, 1)
self.assertHasDefs(fn_body[1].body[1].test, 1)
self.assertHasDefs(fn_body[1].orelse[0].targets[0], 1)
self.assertHasDefs(fn_body[2].value.elts[0], 2)
self.assertHasDefs(fn_body[2].value.elts[1], 2)
def test_nested_functions(self):
def test_fn(a, b):
a = []
if b:
a = []
def foo():
return a
foo()
return a
node = self._parse_and_analyze(test_fn)
fn_body = node.body[0].body
def_of_a_in_if = fn_body[1].body[0].targets[0]
self.assertHasDefs(fn_body[0].targets[0], 1)
self.assertHasDefs(fn_body[1].test, 1)
self.assertHasDefs(def_of_a_in_if, 1)
self.assertHasDefs(fn_body[2].value, 2)
inner_fn_body = fn_body[1].body[1].body
self.assertSameDef(inner_fn_body[0].value, def_of_a_in_if)
def test_nested_functions_isolation(self):
def test_fn(a):
a = 0
def child():
a = 1
return a
child()
return a
node = self._parse_and_analyze(test_fn)
fn_body = node.body[0].body
parent_return = fn_body[3]
child_return = fn_body[1].body[1]
# The assignment `a = 1` makes `a` local to `child`.
self.assertNotSameDef(parent_return.value, child_return.value)
def test_function_call_in_with(self):
def foo(_):
pass
def test_fn(a):
with foo(a):
return a
node = self._parse_and_analyze(test_fn)
fn_body = node.body[0].body
self.assertHasDefs(fn_body[0].items[0].context_expr.func, 0)
self.assertHasDefs(fn_body[0].items[0].context_expr.args[0], 1)
def test_mutation_subscript(self):
def test_fn(a):
l = []
l[0] = a
return l
node = self._parse_and_analyze(test_fn)
fn_body = node.body[0].body
creation = fn_body[0].targets[0]
mutation = fn_body[1].targets[0].value
use = fn_body[2].value
self.assertSameDef(creation, mutation)
self.assertSameDef(creation, use)
def test_replacement(self):
def foo(a):
return a
def test_fn(a):
a = foo(a)
return a
node = self._parse_and_analyze(test_fn)
fn_body = node.body[0].body
param = node.body[0].args.args[0]
source = fn_body[0].value.args[0]
target = fn_body[0].targets[0]
retval = fn_body[1].value
self.assertSameDef(param, source)
self.assertNotSameDef(source, target)
self.assertSameDef(target, retval)
if __name__ == '__main__':
test.main()
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