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import ctypes
import os
import sys
from os.path import dirname, join, exists, normpath
from shutil import which
from libghdl.version import __version__
def _to_char_p(arg):
return ctypes.c_char_p(arg), len(arg)
def _get_libghdl_name():
"""Get the name of the libghdl library (with version and extension)"""
ver = __version__.replace('-', '_').replace('.', '_')
ext = {'win32': 'dll',
'cygwin': 'dll',
'darwin': 'dylib'}.get(sys.platform, 'so')
return 'libghdl-' + ver + '.' + ext
def _check_libghdl_libdir(libdir, basename):
"""Return libghdl path in :param libdir" if found or None"""
if libdir is None:
return None
# print('libghdl: check in {}'.format(libdir))
res = join(libdir, basename)
if exists(res):
return res
return None
def _check_libghdl_bindir(bindir, basename):
if bindir is None:
return None
return _check_libghdl_libdir(normpath(join(bindir, '..', 'lib')), basename)
def _get_libghdl_path():
"""Locate the directory where the shared library is"""
basename = _get_libghdl_name()
# Try GHDL_PREFIX
r = os.environ.get('GHDL_PREFIX')
if r is not None:
# GHDL_PREFIX is the prefix of the vhdl libraries, so remove the
# last path component.
r = _check_libghdl_libdir(dirname(r), basename)
if r is not None:
return r
# Try VUNIT_GHDL_PATH (path of the ghdl binary when using VUnit).
r = _check_libghdl_bindir (os.environ.get('VUNIT_GHDL_PATH'), basename)
if r is not None:
return r
# Try GHDL (name/path of the ghdl binary)
r = os.environ.get('GHDL', 'ghdl')
r = which(r)
if r is not None:
r = _check_libghdl_bindir(dirname(r), basename)
if r is not None:
return r
# Try within libghdl/ python installation
r = __file__
r = _check_libghdl_bindir(dirname(r), basename)
if r is not None:
return r
# Try when running from the build directory
r = normpath(join(dirname(__file__), '..', '..', 'lib'))
r = _check_libghdl_libdir(r, basename)
if r is not None:
return r
# Failed.
raise Exception('Cannot find libghdl {}'.format(basename))
# Load the shared library
_libghdl_path = _get_libghdl_path()
libghdl = ctypes.CDLL(_libghdl_path)
# Initialize it.
libghdl.libghdl_init()
# Set the prefix in order to locate the vhdl libraries.
libghdl.libghdl__set_exec_prefix(
*_to_char_p(dirname(dirname(_libghdl_path)).encode('utf-8')))
def set_option(opt):
"Set option OPT. Return true iff the option is known and handled"
return libghdl.libghdl__set_option(*_to_char_p(opt)) == 0
def analyze_init():
return libghdl.libghdl__analyze_init()
def analyze_file(fname):
return libghdl.libghdl__analyze_file(*_to_char_p(fname))
def disp_config():
return libghdl.ghdllocal__disp_config_prefixes()
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