121 lines
4.5 KiB
Python
121 lines
4.5 KiB
Python
#!/usr/bin/python3
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# Produce headers of assembly constants from C expressions.
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# Copyright (C) 2018-2022 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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#
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <https://www.gnu.org/licenses/>.
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# The input to this script looks like:
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# #cpp-directive ...
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# NAME1
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# NAME2 expression ...
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# A line giving just a name implies an expression consisting of just that name.
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import argparse
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import glibcextract
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def gen_test(sym_data):
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"""Generate a test for the values of some C constants.
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The first argument is as for glibcextract.compute_c_consts.
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"""
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out_lines = []
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for arg in sym_data:
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if isinstance(arg, str):
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if arg == 'START':
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out_lines.append('#include <stdint.h>\n'
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'#include <stdio.h>\n'
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'#include <bits/wordsize.h>\n'
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'#if __WORDSIZE == 64\n'
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'typedef uint64_t c_t;\n'
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'# define U(n) UINT64_C (n)\n'
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'#else\n'
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'typedef uint32_t c_t;\n'
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'# define U(n) UINT32_C (n)\n'
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'#endif\n'
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'static int\n'
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'do_test (void)\n'
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'{\n'
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# Compilation test only, using static
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# assertions.
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' return 0;\n'
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'}\n'
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'#include <support/test-driver.c>')
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else:
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out_lines.append(arg)
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continue
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name = arg[0]
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value = arg[1]
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out_lines.append('_Static_assert (U (asconst_%s) == (c_t) (%s), '
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'"value of %s");'
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% (name, value, name))
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return '\n'.join(out_lines)
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def main():
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"""The main entry point."""
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parser = argparse.ArgumentParser(
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description='Produce headers of assembly constants.')
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parser.add_argument('--cc', metavar='CC',
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help='C compiler (including options) to use')
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parser.add_argument('--test', action='store_true',
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help='Generate test case instead of header')
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parser.add_argument('--python', action='store_true',
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help='Generate Python file instead of header')
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parser.add_argument('sym_file',
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help='.sym file to process')
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args = parser.parse_args()
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sym_data = []
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with open(args.sym_file, 'r') as sym_file:
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started = False
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for line in sym_file:
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line = line.strip()
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if line == '':
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continue
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# Pass preprocessor directives through.
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if line.startswith('#'):
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sym_data.append(line)
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continue
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words = line.split(maxsplit=1)
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if not started:
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sym_data.append('START')
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started = True
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# Separator.
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if words[0] == '--':
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continue
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name = words[0]
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value = words[1] if len(words) > 1 else words[0]
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sym_data.append((name, value))
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if not started:
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sym_data.append('START')
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if args.test:
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print(gen_test(sym_data))
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elif args.python:
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consts = glibcextract.compute_c_consts(sym_data, args.cc)
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print('# GENERATED FILE\n'
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'\n'
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'# Constant definitions.\n'
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'# See gen-as-const.py for details.\n')
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print(''.join('%s = %s\n' % c for c in sorted(consts.items())), end='')
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else:
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consts = glibcextract.compute_c_consts(sym_data, args.cc)
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print(''.join('#define %s %s\n' % c for c in sorted(consts.items())), end='')
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if __name__ == '__main__':
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main()
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