Make mangled_names.test and update_cc_test_checks.py work with Python 2.

    from pipes import quote as shell_quote

def add_update_script_substition(name, python_exe=config.python_executable,

                                 extra_args=''):

def add_update_script_substition(name, extra_args=''):

    script_path = os.path.join(config.llvm_src_root, 'utils', name + '.py')

    assert os.path.isfile(script_path)

    config.substitutions.append(

        ('%' + name, "'%s' %s %s" % (python_exe, script_path, extra_args)))

        ('%' + name, "'%s' %s %s" % (

            config.python_executable, script_path, extra_args)))

config.test_format = lit.formats.ShTest(execute_external=False)

#!/usr/bin/env python3

#!/usr/bin/env python

'''A utility to update LLVM IR CHECK lines in C/C++ FileCheck test files.

Example RUN lines in .c/.cc test files:

% utils/update_cc_test_checks.py --clang=release/bin/clang /tmp/c/a.cc

'''

from __future__ import print_function

import argparse

import collections

import distutils.spawn

def get_line2spell_and_mangled(args, clang_args):

  ret = {}

  # Use clang's JSON AST dump to get the mangled name

  json_dump_args = [args.clang, *clang_args, '-fsyntax-only', '-o', '-']

  json_dump_args = [args.clang] + clang_args + ['-fsyntax-only', '-o', '-']

  if '-cc1' not in json_dump_args:

    # For tests that invoke %clang instead if %clang_cc1 we have to use

    # -Xclang -ast-dump=json instead:

    json_dump_args.append('-Xclang')

  json_dump_args.append('-ast-dump=json')

  common.debug('Running', ' '.join(json_dump_args))

  status = subprocess.run(json_dump_args, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

  if status.returncode != 0:

  popen = subprocess.Popen(json_dump_args, stdout=subprocess.PIPE,

                           stderr=subprocess.PIPE, universal_newlines=True)

  stdout, stderr = popen.communicate()

  if popen.returncode != 0:

    sys.stderr.write('Failed to run ' + ' '.join(json_dump_args) + '\n')

    sys.stderr.write(status.stderr.decode())

    sys.stderr.write(status.stdout.decode())

    sys.stderr.write(stderr)

    sys.stderr.write(stdout)

    sys.exit(2)

  # Parse the clang JSON and add all children of type FunctionDecl.

    mangled = node.get('mangledName', spell)

    ret[int(line)-1] = (spell, mangled)

  ast = json.loads(status.stdout.decode())

  ast = json.loads(stdout)

  if ast['kind'] != 'TranslationUnitDecl':

    common.error('Clang AST dump JSON format changed?')

    sys.exit(2)