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#!/usr/bin/python3
# Copyright 2025 Google LLC
#
# 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.
import sys
import atheris
import ast, gast
def TestOneInput(data):
fdp = atheris.FuzzedDataProvider(data)
source = fdp.ConsumeUnicodeNoSurrogates(sys.maxsize)
try:
tree = gast.parse(source)
except: # catch it all
return
# Any valid tree should be processable
try:
gtree = gast.ast_to_gast(tree)
except RecursionError:
pass
gast.dump(gtree)
for node in gast.walk(gtree):
if isinstance(node, gast.AST):
node_copy = type(node)(**dict(gast.iter_fields(node)))
gast.copy_location(node_copy, node)
gast.fix_missing_locations(node_copy)
if isinstance(node, (gast.AsyncFunctionDef, gast.FunctionDef, gast.ClassDef, gast.Module)):
gast.get_docstring(node)
gast.get_source_segment(source, node)
list(gast.iter_child_nodes(node))
list(gast.iter_fields(node))
try:
gast.literal_eval(node)
except ValueError:
...
gast.increment_lineno(gtree)
gcode = gast.unparse(gtree)
gtree2 = gast.parse(gcode)
gcode2 = gast.unparse(gtree2)
if gcode != gcode2:
raise RuntimeError(gcode, gcode2)
tree2 = gast.gast_to_ast(gtree)
gtree3 = gast.ast_to_gast(tree2)
gcode3 = gast.unparse(gtree3)
if gcode2 != gcode3:
raise RuntimeError(gcode2, gcode3)
gast.dump(gtree3, indent=4, include_attributes=True)
def main():
atheris.instrument_all()
atheris.Setup(sys.argv, TestOneInput, enable_python_coverage=True)
atheris.Fuzz()
if __name__ == "__main__":
main()
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