lib2def.py
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from __future__ import division, absolute_import, print_function
import re
import sys
import subprocess
__doc__ = """This module generates a DEF file from the symbols in
an MSVC-compiled DLL import library. It correctly discriminates between
data and functions. The data is collected from the output of the program
nm(1).
Usage:
python lib2def.py [libname.lib] [output.def]
or
python lib2def.py [libname.lib] > output.def
libname.lib defaults to python<py_ver>.lib and output.def defaults to stdout
Author: Robert Kern <kernr@mail.ncifcrf.gov>
Last Update: April 30, 1999
"""
__version__ = '0.1a'
py_ver = "%d%d" % tuple(sys.version_info[:2])
DEFAULT_NM = ['nm', '-Cs']
DEF_HEADER = """LIBRARY python%s.dll
;CODE PRELOAD MOVEABLE DISCARDABLE
;DATA PRELOAD SINGLE
EXPORTS
""" % py_ver
# the header of the DEF file
FUNC_RE = re.compile(r"^(.*) in python%s\.dll" % py_ver, re.MULTILINE)
DATA_RE = re.compile(r"^_imp__(.*) in python%s\.dll" % py_ver, re.MULTILINE)
def parse_cmd():
"""Parses the command-line arguments.
libfile, deffile = parse_cmd()"""
if len(sys.argv) == 3:
if sys.argv[1][-4:] == '.lib' and sys.argv[2][-4:] == '.def':
libfile, deffile = sys.argv[1:]
elif sys.argv[1][-4:] == '.def' and sys.argv[2][-4:] == '.lib':
deffile, libfile = sys.argv[1:]
else:
print("I'm assuming that your first argument is the library")
print("and the second is the DEF file.")
elif len(sys.argv) == 2:
if sys.argv[1][-4:] == '.def':
deffile = sys.argv[1]
libfile = 'python%s.lib' % py_ver
elif sys.argv[1][-4:] == '.lib':
deffile = None
libfile = sys.argv[1]
else:
libfile = 'python%s.lib' % py_ver
deffile = None
return libfile, deffile
def getnm(nm_cmd=['nm', '-Cs', 'python%s.lib' % py_ver], shell=True):
"""Returns the output of nm_cmd via a pipe.
nm_output = getnm(nm_cmd = 'nm -Cs py_lib')"""
p = subprocess.Popen(nm_cmd, shell=shell, stdout=subprocess.PIPE,
stderr=subprocess.PIPE, universal_newlines=True)
nm_output, nm_err = p.communicate()
if p.returncode != 0:
raise RuntimeError('failed to run "%s": "%s"' % (
' '.join(nm_cmd), nm_err))
return nm_output
def parse_nm(nm_output):
"""Returns a tuple of lists: dlist for the list of data
symbols and flist for the list of function symbols.
dlist, flist = parse_nm(nm_output)"""
data = DATA_RE.findall(nm_output)
func = FUNC_RE.findall(nm_output)
flist = []
for sym in data:
if sym in func and (sym[:2] == 'Py' or sym[:3] == '_Py' or sym[:4] == 'init'):
flist.append(sym)
dlist = []
for sym in data:
if sym not in flist and (sym[:2] == 'Py' or sym[:3] == '_Py'):
dlist.append(sym)
dlist.sort()
flist.sort()
return dlist, flist
def output_def(dlist, flist, header, file = sys.stdout):
"""Outputs the final DEF file to a file defaulting to stdout.
output_def(dlist, flist, header, file = sys.stdout)"""
for data_sym in dlist:
header = header + '\t%s DATA\n' % data_sym
header = header + '\n' # blank line
for func_sym in flist:
header = header + '\t%s\n' % func_sym
file.write(header)
if __name__ == '__main__':
libfile, deffile = parse_cmd()
if deffile is None:
deffile = sys.stdout
else:
deffile = open(deffile, 'w')
nm_cmd = DEFAULT_NM + [str(libfile)]
nm_output = getnm(nm_cmd, shell=False)
dlist, flist = parse_nm(nm_output)
output_def(dlist, flist, DEF_HEADER, deffile)