79 rindas
2.2 KiB
Python
79 rindas
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 os
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import pytest
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import helpers
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import pqclean
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import pycparser
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def setup_module():
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if not(os.path.exists(os.path.join('pycparser', '.git'))):
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print("Please run `git submodule update --init`")
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def walk_tree(ast, parent=[]):
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if type(ast) is pycparser.c_ast.IdentifierType:
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if ast.names == ['char']:
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# allow casts in certain function calls
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try:
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if parent[-5].name.name in ['_mm256_set1_epi8']:
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return
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except:
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pass
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yield ast
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for (_, child) in ast.children():
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# recursively yield prohibited nodes
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yield from walk_tree(child, parent=parent + [ast])
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@pytest.mark.parametrize(
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'implementation',
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pqclean.Scheme.all_implementations(),
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ids=str,
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)
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@helpers.skip_windows()
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@helpers.filtered_test
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def test_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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import sys
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pytest.main(sys.argv)
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