mirror of
https://github.com/henrydcase/pqc.git
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73 lines
2.2 KiB
Python
73 lines
2.2 KiB
Python
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"""
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Checks that the implementation does not make use of the `char` type.
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This is ambiguous; compilers can freely choose `signed` or `unsigned` char.
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"""
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import pqclean
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import pycparser
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import os
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import helpers
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def test_char():
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if not(os.path.exists(os.path.join('pycparser', '.git'))):
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helpers.run_subprocess(
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['git', 'submodule', 'update', '--init']
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)
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for scheme in pqclean.Scheme.all_schemes():
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for implementation in scheme.implementations:
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if helpers.permit_test('char', implementation):
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yield check_char, implementation
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def walk_tree(ast):
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if type(ast) is pycparser.c_ast.IdentifierType:
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if ast.names == ['char']:
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yield ast
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for (_, child) in ast.children():
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yield from walk_tree(child) # recursively yield prohibited nodes
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@helpers.skip_windows()
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def check_char(implementation):
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errors = []
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for fname in os.listdir(implementation.path()):
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if not fname.endswith(".c"):
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continue
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tdir, _ = os.path.split(os.path.realpath(__file__))
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ast = pycparser.parse_file(
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os.path.join(implementation.path(), fname),
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use_cpp=True,
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cpp_path='cc', # not all platforms link cpp correctly; cc -E works
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cpp_args=[
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'-E',
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'-std=c99',
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'-nostdinc', # pycparser cannot deal with e.g. __attribute__
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'-I{}'.format(os.path.join(tdir, "../common")),
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# necessary to mock e.g. <stdint.h>
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'-I{}'.format(
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os.path.join(tdir, 'pycparser/utils/fake_libc_include')),
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]
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)
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for node in walk_tree(ast):
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# flatten nodes to a string to easily enforce uniqueness
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err = "\n at {c.file}:{c.line}:{c.column}".format(c=node.coord)
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if err not in errors:
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errors.append(err)
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if errors:
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raise AssertionError(
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"Prohibited use of char without explicit signed/unsigned" +
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"".join(errors)
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)
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if __name__ == '__main__':
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try:
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import nose2
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nose2.main()
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except ImportError:
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import nose
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nose.runmodule()
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