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195 lines
8.1 KiB
Python
195 lines
8.1 KiB
Python
#!/usr/bin/python3
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# Extract information from C headers.
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# Copyright (C) 2018-2023 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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import collections
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import os.path
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import re
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import subprocess
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import tempfile
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def compute_c_consts(sym_data, cc):
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"""Compute the values of some C constants.
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The first argument is a list whose elements are either strings
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(preprocessor directives, or the special string 'START' to
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indicate this function should insert its initial boilerplate text
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in the output there) or pairs of strings (a name and a C
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expression for the corresponding value). Preprocessor directives
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in the middle of the list may be used to select which constants
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end up being evaluated using which expressions.
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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('void\ndummy (void)\n{')
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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('asm ("/* @@@name@@@%s@@@value@@@%%0@@@end@@@ */" '
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': : \"i\" ((long int) (%s)));'
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% (name, value))
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out_lines.append('}')
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out_lines.append('')
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out_text = '\n'.join(out_lines)
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with tempfile.TemporaryDirectory() as temp_dir:
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c_file_name = os.path.join(temp_dir, 'test.c')
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s_file_name = os.path.join(temp_dir, 'test.s')
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with open(c_file_name, 'w') as c_file:
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c_file.write(out_text)
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# Compilation has to be from stdin to avoid the temporary file
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# name being written into the generated dependencies.
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cmd = ('%s -S -o %s -x c - < %s' % (cc, s_file_name, c_file_name))
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subprocess.check_call(cmd, shell=True)
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consts = {}
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with open(s_file_name, 'r') as s_file:
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for line in s_file:
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match = re.search('@@@name@@@([^@]*)'
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'@@@value@@@[^0-9Xxa-fA-F-]*'
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'([0-9Xxa-fA-F-]+).*@@@end@@@', line)
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if match:
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if (match.group(1) in consts
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and match.group(2) != consts[match.group(1)]):
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raise ValueError('duplicate constant %s'
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% match.group(1))
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consts[match.group(1)] = match.group(2)
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return consts
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def list_macros(source_text, cc):
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"""List the preprocessor macros defined by the given source code.
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The return value is a pair of dicts, the first one mapping macro
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names to their expansions and the second one mapping macro names
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to lists of their arguments, or to None for object-like macros.
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"""
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with tempfile.TemporaryDirectory() as temp_dir:
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c_file_name = os.path.join(temp_dir, 'test.c')
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i_file_name = os.path.join(temp_dir, 'test.i')
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with open(c_file_name, 'w') as c_file:
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c_file.write(source_text)
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cmd = ('%s -E -dM -o %s %s' % (cc, i_file_name, c_file_name))
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subprocess.check_call(cmd, shell=True)
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macros_exp = {}
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macros_args = {}
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with open(i_file_name, 'r') as i_file:
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for line in i_file:
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match = re.fullmatch('#define ([0-9A-Za-z_]+)(.*)\n', line)
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if not match:
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raise ValueError('bad -dM output line: %s' % line)
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name = match.group(1)
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value = match.group(2)
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if value.startswith(' '):
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value = value[1:]
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args = None
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elif value.startswith('('):
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match = re.fullmatch(r'\((.*?)\) (.*)', value)
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if not match:
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raise ValueError('bad -dM output line: %s' % line)
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args = match.group(1).split(',')
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value = match.group(2)
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else:
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raise ValueError('bad -dM output line: %s' % line)
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if name in macros_exp:
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raise ValueError('duplicate macro: %s' % line)
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macros_exp[name] = value
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macros_args[name] = args
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return macros_exp, macros_args
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def compute_macro_consts(source_text, cc, macro_re, exclude_re=None):
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"""Compute the integer constant values of macros defined by source_text.
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Macros must match the regular expression macro_re, and if
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exclude_re is defined they must not match exclude_re. Values are
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computed with compute_c_consts.
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"""
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macros_exp, macros_args = list_macros(source_text, cc)
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macros_set = {m for m in macros_exp
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if (macros_args[m] is None
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and re.fullmatch(macro_re, m)
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and (exclude_re is None
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or not re.fullmatch(exclude_re, m)))}
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sym_data = [source_text, 'START']
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sym_data.extend(sorted((m, m) for m in macros_set))
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return compute_c_consts(sym_data, cc)
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def compare_macro_consts(source_1, source_2, cc, macro_re, exclude_re=None,
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allow_extra_1=False, allow_extra_2=False):
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"""Compare the values of macros defined by two different sources.
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The sources would typically be includes of a glibc header and a
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kernel header. If allow_extra_1, the first source may define
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extra macros (typically if the kernel headers are older than the
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version glibc has taken definitions from); if allow_extra_2, the
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second source may define extra macros (typically if the kernel
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headers are newer than the version glibc has taken definitions
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from). Return 1 if there were any differences other than those
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allowed, 0 if the macro values were the same apart from any
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allowed differences.
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"""
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macros_1 = compute_macro_consts(source_1, cc, macro_re, exclude_re)
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macros_2 = compute_macro_consts(source_2, cc, macro_re, exclude_re)
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if macros_1 == macros_2:
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return 0
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print('First source:\n%s\n' % source_1)
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print('Second source:\n%s\n' % source_2)
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ret = 0
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for name, value in sorted(macros_1.items()):
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if name not in macros_2:
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print('Only in first source: %s' % name)
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if not allow_extra_1:
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ret = 1
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elif macros_1[name] != macros_2[name]:
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print('Different values for %s: %s != %s'
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% (name, macros_1[name], macros_2[name]))
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ret = 1
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for name in sorted(macros_2.keys()):
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if name not in macros_1:
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print('Only in second source: %s' % name)
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if not allow_extra_2:
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ret = 1
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return ret
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CompileResult = collections.namedtuple("CompileResult", "returncode output")
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def compile_c_snippet(snippet, cc, extra_cc_args=''):
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"""Compile and return whether the SNIPPET can be build with CC along
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EXTRA_CC_ARGS compiler flags. Return a CompileResult with RETURNCODE
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being 0 for success, or the failure value and the compiler output.
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"""
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with tempfile.TemporaryDirectory() as temp_dir:
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c_file_name = os.path.join(temp_dir, 'test.c')
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obj_file_name = os.path.join(temp_dir, 'test.o')
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with open(c_file_name, 'w') as c_file:
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c_file.write(snippet + '\n')
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cmd = cc.split() + extra_cc_args.split() + ['-c', '-o', obj_file_name,
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c_file_name]
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r = subprocess.run(cmd, check=False, stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT)
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return CompileResult(r.returncode, r.stdout)
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