mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-09 23:00:07 +00:00
195 lines
8.1 KiB
Python
195 lines
8.1 KiB
Python
#!/usr/bin/python3
|
|
# Extract information from C headers.
|
|
# Copyright (C) 2018-2024 Free Software Foundation, Inc.
|
|
# This file is part of the GNU C Library.
|
|
#
|
|
# The GNU C Library is free software; you can redistribute it and/or
|
|
# modify it under the terms of the GNU Lesser General Public
|
|
# License as published by the Free Software Foundation; either
|
|
# version 2.1 of the License, or (at your option) any later version.
|
|
#
|
|
# The GNU C Library is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
# Lesser General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU Lesser General Public
|
|
# License along with the GNU C Library; if not, see
|
|
# <https://www.gnu.org/licenses/>.
|
|
|
|
import collections
|
|
import os.path
|
|
import re
|
|
import subprocess
|
|
import tempfile
|
|
|
|
|
|
def compute_c_consts(sym_data, cc):
|
|
"""Compute the values of some C constants.
|
|
|
|
The first argument is a list whose elements are either strings
|
|
(preprocessor directives, or the special string 'START' to
|
|
indicate this function should insert its initial boilerplate text
|
|
in the output there) or pairs of strings (a name and a C
|
|
expression for the corresponding value). Preprocessor directives
|
|
in the middle of the list may be used to select which constants
|
|
end up being evaluated using which expressions.
|
|
|
|
"""
|
|
out_lines = []
|
|
for arg in sym_data:
|
|
if isinstance(arg, str):
|
|
if arg == 'START':
|
|
out_lines.append('void\ndummy (void)\n{')
|
|
else:
|
|
out_lines.append(arg)
|
|
continue
|
|
name = arg[0]
|
|
value = arg[1]
|
|
out_lines.append('asm ("/* @@@name@@@%s@@@value@@@%%0@@@end@@@ */" '
|
|
': : \"i\" ((long int) (%s)));'
|
|
% (name, value))
|
|
out_lines.append('}')
|
|
out_lines.append('')
|
|
out_text = '\n'.join(out_lines)
|
|
with tempfile.TemporaryDirectory() as temp_dir:
|
|
c_file_name = os.path.join(temp_dir, 'test.c')
|
|
s_file_name = os.path.join(temp_dir, 'test.s')
|
|
with open(c_file_name, 'w') as c_file:
|
|
c_file.write(out_text)
|
|
# Compilation has to be from stdin to avoid the temporary file
|
|
# name being written into the generated dependencies.
|
|
cmd = ('%s -S -o %s -x c - < %s' % (cc, s_file_name, c_file_name))
|
|
subprocess.check_call(cmd, shell=True)
|
|
consts = {}
|
|
with open(s_file_name, 'r') as s_file:
|
|
for line in s_file:
|
|
match = re.search('@@@name@@@([^@]*)'
|
|
'@@@value@@@[^0-9Xxa-fA-F-]*'
|
|
'([0-9Xxa-fA-F-]+).*@@@end@@@', line)
|
|
if match:
|
|
if (match.group(1) in consts
|
|
and match.group(2) != consts[match.group(1)]):
|
|
raise ValueError('duplicate constant %s'
|
|
% match.group(1))
|
|
consts[match.group(1)] = match.group(2)
|
|
return consts
|
|
|
|
|
|
def list_macros(source_text, cc):
|
|
"""List the preprocessor macros defined by the given source code.
|
|
|
|
The return value is a pair of dicts, the first one mapping macro
|
|
names to their expansions and the second one mapping macro names
|
|
to lists of their arguments, or to None for object-like macros.
|
|
|
|
"""
|
|
with tempfile.TemporaryDirectory() as temp_dir:
|
|
c_file_name = os.path.join(temp_dir, 'test.c')
|
|
i_file_name = os.path.join(temp_dir, 'test.i')
|
|
with open(c_file_name, 'w') as c_file:
|
|
c_file.write(source_text)
|
|
cmd = ('%s -E -dM -o %s %s' % (cc, i_file_name, c_file_name))
|
|
subprocess.check_call(cmd, shell=True)
|
|
macros_exp = {}
|
|
macros_args = {}
|
|
with open(i_file_name, 'r') as i_file:
|
|
for line in i_file:
|
|
match = re.fullmatch('#define ([0-9A-Za-z_]+)(.*)\n', line)
|
|
if not match:
|
|
raise ValueError('bad -dM output line: %s' % line)
|
|
name = match.group(1)
|
|
value = match.group(2)
|
|
if value.startswith(' '):
|
|
value = value[1:]
|
|
args = None
|
|
elif value.startswith('('):
|
|
match = re.fullmatch(r'\((.*?)\) (.*)', value)
|
|
if not match:
|
|
raise ValueError('bad -dM output line: %s' % line)
|
|
args = match.group(1).split(',')
|
|
value = match.group(2)
|
|
else:
|
|
raise ValueError('bad -dM output line: %s' % line)
|
|
if name in macros_exp:
|
|
raise ValueError('duplicate macro: %s' % line)
|
|
macros_exp[name] = value
|
|
macros_args[name] = args
|
|
return macros_exp, macros_args
|
|
|
|
|
|
def compute_macro_consts(source_text, cc, macro_re, exclude_re=None):
|
|
"""Compute the integer constant values of macros defined by source_text.
|
|
|
|
Macros must match the regular expression macro_re, and if
|
|
exclude_re is defined they must not match exclude_re. Values are
|
|
computed with compute_c_consts.
|
|
|
|
"""
|
|
macros_exp, macros_args = list_macros(source_text, cc)
|
|
macros_set = {m for m in macros_exp
|
|
if (macros_args[m] is None
|
|
and re.fullmatch(macro_re, m)
|
|
and (exclude_re is None
|
|
or not re.fullmatch(exclude_re, m)))}
|
|
sym_data = [source_text, 'START']
|
|
sym_data.extend(sorted((m, m) for m in macros_set))
|
|
return compute_c_consts(sym_data, cc)
|
|
|
|
|
|
def compare_macro_consts(source_1, source_2, cc, macro_re, exclude_re=None,
|
|
allow_extra_1=False, allow_extra_2=False):
|
|
"""Compare the values of macros defined by two different sources.
|
|
|
|
The sources would typically be includes of a glibc header and a
|
|
kernel header. If allow_extra_1, the first source may define
|
|
extra macros (typically if the kernel headers are older than the
|
|
version glibc has taken definitions from); if allow_extra_2, the
|
|
second source may define extra macros (typically if the kernel
|
|
headers are newer than the version glibc has taken definitions
|
|
from). Return 1 if there were any differences other than those
|
|
allowed, 0 if the macro values were the same apart from any
|
|
allowed differences.
|
|
|
|
"""
|
|
macros_1 = compute_macro_consts(source_1, cc, macro_re, exclude_re)
|
|
macros_2 = compute_macro_consts(source_2, cc, macro_re, exclude_re)
|
|
if macros_1 == macros_2:
|
|
return 0
|
|
print('First source:\n%s\n' % source_1)
|
|
print('Second source:\n%s\n' % source_2)
|
|
ret = 0
|
|
for name, value in sorted(macros_1.items()):
|
|
if name not in macros_2:
|
|
print('Only in first source: %s' % name)
|
|
if not allow_extra_1:
|
|
ret = 1
|
|
elif macros_1[name] != macros_2[name]:
|
|
print('Different values for %s: %s != %s'
|
|
% (name, macros_1[name], macros_2[name]))
|
|
ret = 1
|
|
for name in sorted(macros_2.keys()):
|
|
if name not in macros_1:
|
|
print('Only in second source: %s' % name)
|
|
if not allow_extra_2:
|
|
ret = 1
|
|
return ret
|
|
|
|
CompileResult = collections.namedtuple("CompileResult", "returncode output")
|
|
|
|
def compile_c_snippet(snippet, cc, extra_cc_args=''):
|
|
"""Compile and return whether the SNIPPET can be build with CC along
|
|
EXTRA_CC_ARGS compiler flags. Return a CompileResult with RETURNCODE
|
|
being 0 for success, or the failure value and the compiler output.
|
|
"""
|
|
with tempfile.TemporaryDirectory() as temp_dir:
|
|
c_file_name = os.path.join(temp_dir, 'test.c')
|
|
obj_file_name = os.path.join(temp_dir, 'test.o')
|
|
with open(c_file_name, 'w') as c_file:
|
|
c_file.write(snippet + '\n')
|
|
cmd = cc.split() + extra_cc_args.split() + ['-c', '-o', obj_file_name,
|
|
c_file_name]
|
|
r = subprocess.run(cmd, check=False, stdout=subprocess.PIPE,
|
|
stderr=subprocess.STDOUT)
|
|
return CompileResult(r.returncode, r.stdout)
|