308 lines
11 KiB
Python
308 lines
11 KiB
Python
|
#
|
||
|
|
# DEPRECATED: implementation for ffi.verify()
|
||
|
|
#
|
||
|
|
import sys, os, binascii, shutil, io
|
||
|
|
from . import __version_verifier_modules__
|
||
|
|
from . import ffiplatform
|
||
|
|
from .error import VerificationError
|
||
|
|
|
||
|
|
if sys.version_info >= (3, 3):
|
||
|
|
import importlib.machinery
|
||
|
|
def _extension_suffixes():
|
||
|
|
return importlib.machinery.EXTENSION_SUFFIXES[:]
|
||
|
|
else:
|
||
|
|
import imp
|
||
|
|
def _extension_suffixes():
|
||
|
|
return [suffix for suffix, _, type in imp.get_suffixes()
|
||
|
|
if type == imp.C_EXTENSION]
|
||
|
|
|
||
|
|
|
||
|
|
if sys.version_info >= (3,):
|
||
|
|
NativeIO = io.StringIO
|
||
|
|
else:
|
||
|
|
class NativeIO(io.BytesIO):
|
||
|
|
def write(self, s):
|
||
|
|
if isinstance(s, unicode):
|
||
|
|
s = s.encode('ascii')
|
||
|
|
super(NativeIO, self).write(s)
|
||
|
|
|
||
|
|
|
||
|
|
class Verifier(object):
|
||
|
|
|
||
|
|
def __init__(self, ffi, preamble, tmpdir=None, modulename=None,
|
||
|
|
ext_package=None, tag='', force_generic_engine=False,
|
||
|
|
source_extension='.c', flags=None, relative_to=None, **kwds):
|
||
|
|
if ffi._parser._uses_new_feature:
|
||
|
|
raise VerificationError(
|
||
|
|
"feature not supported with ffi.verify(), but only "
|
||
|
|
"with ffi.set_source(): %s" % (ffi._parser._uses_new_feature,))
|
||
|
|
self.ffi = ffi
|
||
|
|
self.preamble = preamble
|
||
|
|
if not modulename:
|
||
|
|
flattened_kwds = ffiplatform.flatten(kwds)
|
||
|
|
vengine_class = _locate_engine_class(ffi, force_generic_engine)
|
||
|
|
self._vengine = vengine_class(self)
|
||
|
|
self._vengine.patch_extension_kwds(kwds)
|
||
|
|
self.flags = flags
|
||
|
|
self.kwds = self.make_relative_to(kwds, relative_to)
|
||
|
|
#
|
||
|
|
if modulename:
|
||
|
|
if tag:
|
||
|
|
raise TypeError("can't specify both 'modulename' and 'tag'")
|
||
|
|
else:
|
||
|
|
key = '\x00'.join(['%d.%d' % sys.version_info[:2],
|
||
|
|
__version_verifier_modules__,
|
||
|
|
preamble, flattened_kwds] +
|
||
|
|
ffi._cdefsources)
|
||
|
|
if sys.version_info >= (3,):
|
||
|
|
key = key.encode('utf-8')
|
||
|
|
k1 = hex(binascii.crc32(key[0::2]) & 0xffffffff)
|
||
|
|
k1 = k1.lstrip('0x').rstrip('L')
|
||
|
|
k2 = hex(binascii.crc32(key[1::2]) & 0xffffffff)
|
||
|
|
k2 = k2.lstrip('0').rstrip('L')
|
||
|
|
modulename = '_cffi_%s_%s%s%s' % (tag, self._vengine._class_key,
|
||
|
|
k1, k2)
|
||
|
|
suffix = _get_so_suffixes()[0]
|
||
|
|
self.tmpdir = tmpdir or _caller_dir_pycache()
|
||
|
|
self.sourcefilename = os.path.join(self.tmpdir, modulename + source_extension)
|
||
|
|
self.modulefilename = os.path.join(self.tmpdir, modulename + suffix)
|
||
|
|
self.ext_package = ext_package
|
||
|
|
self._has_source = False
|
||
|
|
self._has_module = False
|
||
|
|
|
||
|
|
def write_source(self, file=None):
|
||
|
|
"""Write the C source code. It is produced in 'self.sourcefilename',
|
||
|
|
which can be tweaked beforehand."""
|
||
|
|
with self.ffi._lock:
|
||
|
|
if self._has_source and file is None:
|
||
|
|
raise VerificationError(
|
||
|
|
"source code already written")
|
||
|
|
self._write_source(file)
|
||
|
|
|
||
|
|
def compile_module(self):
|
||
|
|
"""Write the C source code (if not done already) and compile it.
|
||
|
|
This produces a dynamic link library in 'self.modulefilename'."""
|
||
|
|
with self.ffi._lock:
|
||
|
|
if self._has_module:
|
||
|
|
raise VerificationError("module already compiled")
|
||
|
|
if not self._has_source:
|
||
|
|
self._write_source()
|
||
|
|
self._compile_module()
|
||
|
|
|
||
|
|
def load_library(self):
|
||
|
|
"""Get a C module from this Verifier instance.
|
||
|
|
Returns an instance of a FFILibrary class that behaves like the
|
||
|
|
objects returned by ffi.dlopen(), but that delegates all
|
||
|
|
operations to the C module. If necessary, the C code is written
|
||
|
|
and compiled first.
|
||
|
|
"""
|
||
|
|
with self.ffi._lock:
|
||
|
|
if not self._has_module:
|
||
|
|
self._locate_module()
|
||
|
|
if not self._has_module:
|
||
|
|
if not self._has_source:
|
||
|
|
self._write_source()
|
||
|
|
self._compile_module()
|
||
|
|
return self._load_library()
|
||
|
|
|
||
|
|
def get_module_name(self):
|
||
|
|
basename = os.path.basename(self.modulefilename)
|
||
|
|
# kill both the .so extension and the other .'s, as introduced
|
||
|
|
# by Python 3: 'basename.cpython-33m.so'
|
||
|
|
basename = basename.split('.', 1)[0]
|
||
|
|
# and the _d added in Python 2 debug builds --- but try to be
|
||
|
|
# conservative and not kill a legitimate _d
|
||
|
|
if basename.endswith('_d') and hasattr(sys, 'gettotalrefcount'):
|
||
|
|
basename = basename[:-2]
|
||
|
|
return basename
|
||
|
|
|
||
|
|
def get_extension(self):
|
||
|
|
ffiplatform._hack_at_distutils() # backward compatibility hack
|
||
|
|
if not self._has_source:
|
||
|
|
with self.ffi._lock:
|
||
|
|
if not self._has_source:
|
||
|
|
self._write_source()
|
||
|
|
sourcename = ffiplatform.maybe_relative_path(self.sourcefilename)
|
||
|
|
modname = self.get_module_name()
|
||
|
|
return ffiplatform.get_extension(sourcename, modname, **self.kwds)
|
||
|
|
|
||
|
|
def generates_python_module(self):
|
||
|
|
return self._vengine._gen_python_module
|
||
|
|
|
||
|
|
def make_relative_to(self, kwds, relative_to):
|
||
|
|
if relative_to and os.path.dirname(relative_to):
|
||
|
|
dirname = os.path.dirname(relative_to)
|
||
|
|
kwds = kwds.copy()
|
||
|
|
for key in ffiplatform.LIST_OF_FILE_NAMES:
|
||
|
|
if key in kwds:
|
||
|
|
lst = kwds[key]
|
||
|
|
if not isinstance(lst, (list, tuple)):
|
||
|
|
raise TypeError("keyword '%s' should be a list or tuple"
|
||
|
|
% (key,))
|
||
|
|
lst = [os.path.join(dirname, fn) for fn in lst]
|
||
|
|
kwds[key] = lst
|
||
|
|
return kwds
|
||
|
|
|
||
|
|
# ----------
|
||
|
|
|
||
|
|
def _locate_module(self):
|
||
|
|
if not os.path.isfile(self.modulefilename):
|
||
|
|
if self.ext_package:
|
||
|
|
try:
|
||
|
|
pkg = __import__(self.ext_package, None, None, ['__doc__'])
|
||
|
|
except ImportError:
|
||
|
|
return # cannot import the package itself, give up
|
||
|
|
# (e.g. it might be called differently before installation)
|
||
|
|
path = pkg.__path__
|
||
|
|
else:
|
||
|
|
path = None
|
||
|
|
filename = self._vengine.find_module(self.get_module_name(), path,
|
||
|
|
_get_so_suffixes())
|
||
|
|
if filename is None:
|
||
|
|
return
|
||
|
|
self.modulefilename = filename
|
||
|
|
self._vengine.collect_types()
|
||
|
|
self._has_module = True
|
||
|
|
|
||
|
|
def _write_source_to(self, file):
|
||
|
|
self._vengine._f = file
|
||
|
|
try:
|
||
|
|
self._vengine.write_source_to_f()
|
||
|
|
finally:
|
||
|
|
del self._vengine._f
|
||
|
|
|
||
|
|
def _write_source(self, file=None):
|
||
|
|
if file is not None:
|
||
|
|
self._write_source_to(file)
|
||
|
|
else:
|
||
|
|
# Write our source file to an in memory file.
|
||
|
|
f = NativeIO()
|
||
|
|
self._write_source_to(f)
|
||
|
|
source_data = f.getvalue()
|
||
|
|
|
||
|
|
# Determine if this matches the current file
|
||
|
|
if os.path.exists(self.sourcefilename):
|
||
|
|
with open(self.sourcefilename, "r") as fp:
|
||
|
|
needs_written = not (fp.read() == source_data)
|
||
|
|
else:
|
||
|
|
needs_written = True
|
||
|
|
|
||
|
|
# Actually write the file out if it doesn't match
|
||
|
|
if needs_written:
|
||
|
|
_ensure_dir(self.sourcefilename)
|
||
|
|
with open(self.sourcefilename, "w") as fp:
|
||
|
|
fp.write(source_data)
|
||
|
|
|
||
|
|
# Set this flag
|
||
|
|
self._has_source = True
|
||
|
|
|
||
|
|
def _compile_module(self):
|
||
|
|
# compile this C source
|
||
|
|
tmpdir = os.path.dirname(self.sourcefilename)
|
||
|
|
outputfilename = ffiplatform.compile(tmpdir, self.get_extension())
|
||
|
|
try:
|
||
|
|
same = ffiplatform.samefile(outputfilename, self.modulefilename)
|
||
|
|
except OSError:
|
||
|
|
same = False
|
||
|
|
if not same:
|
||
|
|
_ensure_dir(self.modulefilename)
|
||
|
|
shutil.move(outputfilename, self.modulefilename)
|
||
|
|
self._has_module = True
|
||
|
|
|
||
|
|
def _load_library(self):
|
||
|
|
assert self._has_module
|
||
|
|
if self.flags is not None:
|
||
|
|
return self._vengine.load_library(self.flags)
|
||
|
|
else:
|
||
|
|
return self._vengine.load_library()
|
||
|
|
|
||
|
|
# ____________________________________________________________
|
||
|
|
|
||
|
|
_FORCE_GENERIC_ENGINE = False # for tests
|
||
|
|
|
||
|
|
def _locate_engine_class(ffi, force_generic_engine):
|
||
|
|
if _FORCE_GENERIC_ENGINE:
|
||
|
|
force_generic_engine = True
|
||
|
|
if not force_generic_engine:
|
||
|
|
if '__pypy__' in sys.builtin_module_names:
|
||
|
|
force_generic_engine = True
|
||
|
|
else:
|
||
|
|
try:
|
||
|
|
import _cffi_backend
|
||
|
|
except ImportError:
|
||
|
|
_cffi_backend = '?'
|
||
|
|
if ffi._backend is not _cffi_backend:
|
||
|
|
force_generic_engine = True
|
||
|
|
if force_generic_engine:
|
||
|
|
from . import vengine_gen
|
||
|
|
return vengine_gen.VGenericEngine
|
||
|
|
else:
|
||
|
|
from . import vengine_cpy
|
||
|
|
return vengine_cpy.VCPythonEngine
|
||
|
|
|
||
|
|
# ____________________________________________________________
|
||
|
|
|
||
|
|
_TMPDIR = None
|
||
|
|
|
||
|
|
def _caller_dir_pycache():
|
||
|
|
if _TMPDIR:
|
||
|
|
return _TMPDIR
|
||
|
|
result = os.environ.get('CFFI_TMPDIR')
|
||
|
|
if result:
|
||
|
|
return result
|
||
|
|
filename = sys._getframe(2).f_code.co_filename
|
||
|
|
return os.path.abspath(os.path.join(os.path.dirname(filename),
|
||
|
|
'__pycache__'))
|
||
|
|
|
||
|
|
def set_tmpdir(dirname):
|
||
|
|
"""Set the temporary directory to use instead of __pycache__."""
|
||
|
|
global _TMPDIR
|
||
|
|
_TMPDIR = dirname
|
||
|
|
|
||
|
|
def cleanup_tmpdir(tmpdir=None, keep_so=False):
|
||
|
|
"""Clean up the temporary directory by removing all files in it
|
||
|
|
called `_cffi_*.{c,so}` as well as the `build` subdirectory."""
|
||
|
|
tmpdir = tmpdir or _caller_dir_pycache()
|
||
|
|
try:
|
||
|
|
filelist = os.listdir(tmpdir)
|
||
|
|
except OSError:
|
||
|
|
return
|
||
|
|
if keep_so:
|
||
|
|
suffix = '.c' # only remove .c files
|
||
|
|
else:
|
||
|
|
suffix = _get_so_suffixes()[0].lower()
|
||
|
|
for fn in filelist:
|
||
|
|
if fn.lower().startswith('_cffi_') and (
|
||
|
|
fn.lower().endswith(suffix) or fn.lower().endswith('.c')):
|
||
|
|
try:
|
||
|
|
os.unlink(os.path.join(tmpdir, fn))
|
||
|
|
except OSError:
|
||
|
|
pass
|
||
|
|
clean_dir = [os.path.join(tmpdir, 'build')]
|
||
|
|
for dir in clean_dir:
|
||
|
|
try:
|
||
|
|
for fn in os.listdir(dir):
|
||
|
|
fn = os.path.join(dir, fn)
|
||
|
|
if os.path.isdir(fn):
|
||
|
|
clean_dir.append(fn)
|
||
|
|
else:
|
||
|
|
os.unlink(fn)
|
||
|
|
except OSError:
|
||
|
|
pass
|
||
|
|
|
||
|
|
def _get_so_suffixes():
|
||
|
|
suffixes = _extension_suffixes()
|
||
|
|
if not suffixes:
|
||
|
|
# bah, no C_EXTENSION available. Occurs on pypy without cpyext
|
||
|
|
if sys.platform == 'win32':
|
||
|
|
suffixes = [".pyd"]
|
||
|
|
else:
|
||
|
|
suffixes = [".so"]
|
||
|
|
|
||
|
|
return suffixes
|
||
|
|
|
||
|
|
def _ensure_dir(filename):
|
||
|
|
dirname = os.path.dirname(filename)
|
||
|
|
if dirname and not os.path.isdir(dirname):
|
||
|
|
os.makedirs(dirname)
|