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# -*- coding: utf-8 -*-
# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
# See for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
""" This module is responsible for to parse a compiler invocation. """
import re
import os
import collections
__all__ = ['split_command', 'classify_source', 'compiler_language']
# Ignored compiler options map for compilation database creation.
# The map is used in `split_command` method. (Which does ignore and classify
# parameters.) Please note, that these are not the only parameters which
# might be ignored.
# Keys are the option name, value number of options to skip
# compiling only flag, ignored because the creator of compilation
# database will explicitly set it.
'-c': 0,
# preprocessor macros, ignored because would cause duplicate entries in
# the output (the only difference would be these flags). this is actual
# finding from users, who suffered longer execution time caused by the
# duplicates.
'-MD': 0,
'-MMD': 0,
'-MG': 0,
'-MP': 0,
'-MF': 1,
'-MT': 1,
'-MQ': 1,
# linker options, ignored because for compilation database will contain
# compilation commands only. so, the compiler would ignore these flags
# anyway. the benefit to get rid of them is to make the output more
# readable.
'-static': 0,
'-shared': 0,
'-s': 0,
'-rdynamic': 0,
'-l': 1,
'-L': 1,
'-u': 1,
'-z': 1,
'-T': 1,
'-Xlinker': 1
# Known C/C++ compiler executable name patterns
def split_command(command):
""" Returns a value when the command is a compilation, None otherwise.
The value on success is a named tuple with the following attributes:
files: list of source files
flags: list of compile options
compiler: string value of 'c' or 'c++' """
# the result of this method
result = collections.namedtuple('Compilation',
['compiler', 'flags', 'files'])
result.compiler = compiler_language(command)
result.flags = []
result.files = []
# quit right now, if the program was not a C/C++ compiler
if not result.compiler:
return None
# iterate on the compile options
args = iter(command[1:])
for arg in args:
# quit when compilation pass is not involved
if arg in {'-E', '-S', '-cc1', '-M', '-MM', '-###'}:
return None
# ignore some flags
elif arg in IGNORED_FLAGS:
count = IGNORED_FLAGS[arg]
for _ in range(count):
elif re.match(r'^-(l|L|Wl,).+', arg):
# some parameters could look like filename, take as compile option
elif arg in {'-D', '-I'}:
result.flags.extend([arg, next(args)])
# parameter which looks source file is taken...
elif re.match(r'^[^-].+', arg) and classify_source(arg):
# and consider everything else as compile option.
# do extra check on number of source files
return result if result.files else None
def classify_source(filename, c_compiler=True):
""" Return the language from file name extension. """
mapping = {
'.c': 'c' if c_compiler else 'c++',
'.i': 'c-cpp-output' if c_compiler else 'c++-cpp-output',
'.ii': 'c++-cpp-output',
'.m': 'objective-c',
'.mi': 'objective-c-cpp-output',
'.mm': 'objective-c++',
'.mii': 'objective-c++-cpp-output',
'.C': 'c++',
'.cc': 'c++',
'.CC': 'c++',
'.cp': 'c++',
'.cpp': 'c++',
'.cxx': 'c++',
'.c++': 'c++',
'.C++': 'c++',
'.txx': 'c++'
__, extension = os.path.splitext(os.path.basename(filename))
return mapping.get(extension)
def compiler_language(command):
""" A predicate to decide the command is a compiler call or not.
Returns 'c' or 'c++' when it match. None otherwise. """
cplusplus = re.compile(r'^(.+)(\+\+)(-.+|)$')
if command:
executable = os.path.basename(command[0])
if any(pattern.match(executable) for pattern in COMPILER_PATTERNS):
return 'c++' if cplusplus.match(executable) else 'c'
return None