Quick usage guide in the docs/ folder.
- 2021-02:
- Thanks for the pull requests
- Note: libclang-xx-dev must be installed for stddef and other reasons.
- bump to libclang-11
- 2018-01-03: master branch works with libclang-5.0 HEAD, python clang from pypi, python3
- 2017-05-01: master branch works with libclang-4.0 HEAD
On Ubuntu, libclang libraries are installed with versions.
This library tries to load a few different versions to help you out. (__init__.py)
But if you encounter a version compatibility issue, you might have to fix the problem
using one of the following solutions:
- Install libclang-11-dev to get libclang.so (maybe)
- OR create a link to libclang-11.so.1 named libclang.so
- OR hardcode a call to clang.cindex.Config.load_library_file('libclang-10.so.1') in your code
Stable Distribution is available through PyPi at https://pypi.python.org/pypi/ctypeslib2/
sudo pip install ctypeslib2
See the LLVM Clang instructions at http://apt.llvm.org/ or use your distribution's packages.
import ctypeslib
py_module = ctypeslib.translate('''int i = 12;''')
print(py_module.i) # Prints 12
py_module2 = ctypeslib.translate('''struct coordinates { int i ; int y; };''')
print(py_module.struct_coordinates) # <class 'struct_coordinates'>
print(py_module.struct_coordinates(1,2)) # <struct_coordinates object at 0xabcde12345>
Look at test/test_example_script.py for more advanced Library usage
Source file:
$ cat t.c
struct my_bitfield {
long a:3;
long b:4;
unsigned long long c:3;
unsigned long long d:3;
long f:2;
};
Run c-to-python script:
clang2py t.c
Output:
# -*- coding: utf-8 -*-
#
# TARGET arch is: []
# WORD_SIZE is: 8
# POINTER_SIZE is: 8
# LONGDOUBLE_SIZE is: 16
#
import ctypes
class struct_my_bitfield(ctypes.Structure):
_pack_ = True # source:False
_fields_ = [
('a', ctypes.c_int64, 3),
('b', ctypes.c_int64, 4),
('c', ctypes.c_int64, 3),
('d', ctypes.c_int64, 3),
('f', ctypes.c_int64, 2),
('PADDING_0', ctypes.c_int64, 49)]
__all__ = \
['struct_my_bitfield']
Source file:
$ cat test-stdbool.c
#include <stdbool.h>
typedef struct s_foo {
bool bar1;
bool bar2;
bool bar3;
} foo;
Run c-to-python script (with any relevant include folder):
clang2py --clang-args="-I/usr/include/clang/4.0/include" test-stdbool.c
Output:
# -*- coding: utf-8 -*-
#
# TARGET arch is: ['-I/usr/include/clang/4.0/include']
# WORD_SIZE is: 8
# POINTER_SIZE is: 8
# LONGDOUBLE_SIZE is: 16
#
import ctypes
class struct_s_foo(ctypes.Structure):
_pack_ = True # source:False
_fields_ = [
('bar1', ctypes.c_bool),
('bar2', ctypes.c_bool),
('bar3', ctypes.c_bool),]
foo = struct_s_foo
__all__ = ['struct_s_foo', 'foo']
clang2py test/data/test-record.c
This outputs:
# ...
class struct_Node2(Structure):
_pack_ = True # source:False
_fields_ = [
('m1', ctypes.c_ubyte),
('PADDING_0', ctypes.c_ubyte * 7),
('m2', POINTER_T(struct_Node)),]
# ...
The PADDING_0 field is added to force the ctypes memory Structure to align fields offset with the definition given by the clang compiler.
The pack attribute forces the alignment on 0 bytes, to ensure all fields are as defined by this library, and not per the compiler used by the host python binary
The objective of this, is to be able to produce cross-architecture python code, that can read memory structures from a different architecture (like reading a memory dump from a different architecture)
usage: clang2py [-h] [-c] [-d] [--debug] [-e] [-k TYPEKIND] [-i] [-l DLL]
[-m module] [--nm NM] [-o OUTPUT] [-p DLL] [-q]
[-r EXPRESSION] [-s SYMBOL] [-t TARGET] [-v] [-V] [-w W] [-x]
[--show-ids SHOWIDS] [--max-depth N] [--clang-args CLANG_ARGS]
files [files ...]
Version 2.3.0. Generate python code from C headers
positional arguments:
files source filenames. stdin is not supported
optional arguments:
-h, --help show this help message and exit
-c, --comments include source doxygen-style comments
-d, --doc include docstrings containing C prototype and source
file location
--debug setLevel to DEBUG
-e, --show-definition-location
include source file location in comments
-k TYPEKIND, --kind TYPEKIND
kind of type descriptions to include: a = Alias, c =
Class, d = Variable, e = Enumeration, f = Function, m
= Macro, #define s = Structure, t = Typedef, u = Union
default = 'cdefstu'
-i, --includes include declaration defined outside of the sourcefiles
-l DLL, --include-library DLL
library to search for exported functions. Add multiple
times if required
-m module, --module module
Python module(s) containing symbols which will be
imported instead of generated
--nm NM nm program to use to extract symbols from libraries
-o OUTPUT, --output OUTPUT
output filename (if not specified, standard output
will be used)
-p DLL, --preload DLL
dll to be loaded before all others (to resolve
symbols)
-q, --quiet Shut down warnings and below
-r EXPRESSION, --regex EXPRESSION
regular expression for symbols to include (if neither
symbols nor expressions are specified,everything will
be included)
-s SYMBOL, --symbol SYMBOL
symbol to include (if neither symbols nor expressions
are specified,everything will be included)
-t TARGET, --target TARGET
target architecture (default: x86_64-Linux)
-v, --verbose verbose output
-V, --version show program's version number and exit
-w W add all standard windows dlls to the searched dlls
list
-x, --exclude-includes
Parse object in sources files only. Ignore includes
--show-ids SHOWIDS Don't compute cursor IDs (very slow)
--max-depth N Limit cursor expansion to depth N
--clang-args CLANG_ARGS
clang options, in quotes: --clang-args="-std=c99
-Wall"
Cross-architecture: You can pass target modifiers to clang. For example, try
--clang-args="-target x86_64" or "-target i386-linux" to change the target CPU
arch.
- clang2py is a script that calls ctypeslib/ctypeslib/clang2py.py
- clang2py.py is mostly the old xml2py.py module forked to use libclang.
- clang2py.py calls ctypeslib/ctypeslib/codegen/codegenerator.py
- codegenerator.py calls ctypeslib/ctypeslib/codegen/clangparser.py
- clangparser.py uses libclang's python binding to access the clang internal representation of the C source code.
- It then translate each child of the AST tree to python objects as listed in typedesc.
- codegenerator.py then uses these python object to generate ctypes-based python source code.
Because clang is capable to handle different target architecture, this fork {is/should be} able to produce cross-platform memory representation if needed.
This fork of ctypeslib is mainly about using the libclang1>=3.7 python bindings to generate python code from C source code, instead of gccxml.
the original ctypeslib contains these packages:
ctypeslib.codegen- a code generatorctypeslib.contrib- various contributed modulesctypeslib.util- assorted small helper functionsctypeslib.test- unittests
This fork of ctypeslib is heavily patched for clang.
- https://github.com/trolldbois/ctypeslib is based on rev77594 of the original ctypeslib.
- git-svn-id: http://svn.python.org/projects/ctypes/trunk/ctypeslib@775946015fed2-1504-0410-9fe1-9d1591cc4771
The original ctypeslib is written by
- author="Thomas Heller",
- author_email="theller@ctypes.org",