D7net
Home
Console
Upload
information
Create File
Create Folder
About
Tools
:
/
proc
/
3
/
cwd
/
opt
/
imh-python
/
lib
/
python2.7
/
site-packages
/
cffi
/
Filename :
api.py
back
Copy
import sys, types from .lock import allocate_lock try: callable except NameError: # Python 3.1 from collections import Callable callable = lambda x: isinstance(x, Callable) try: basestring except NameError: # Python 3.x basestring = str class FFIError(Exception): pass class CDefError(Exception): def __str__(self): try: line = 'line %d: ' % (self.args[1].coord.line,) except (AttributeError, TypeError, IndexError): line = '' return '%s%s' % (line, self.args[0]) class FFI(object): r''' The main top-level class that you instantiate once, or once per module. Example usage: ffi = FFI() ffi.cdef(""" int printf(const char *, ...); """) C = ffi.dlopen(None) # standard library -or- C = ffi.verify() # use a C compiler: verify the decl above is right C.printf("hello, %s!\n", ffi.new("char[]", "world")) ''' def __init__(self, backend=None): """Create an FFI instance. The 'backend' argument is used to select a non-default backend, mostly for tests. """ from . import cparser, model if backend is None: # You need PyPy (>= 2.0 beta), or a CPython (>= 2.6) with # _cffi_backend.so compiled. import _cffi_backend as backend from . import __version__ assert backend.__version__ == __version__, \ "version mismatch, %s != %s" % (backend.__version__, __version__) # (If you insist you can also try to pass the option # 'backend=backend_ctypes.CTypesBackend()', but don't # rely on it! It's probably not going to work well.) self._backend = backend self._lock = allocate_lock() self._parser = cparser.Parser() self._cached_btypes = {} self._parsed_types = types.ModuleType('parsed_types').__dict__ self._new_types = types.ModuleType('new_types').__dict__ self._function_caches = [] self._libraries = [] self._cdefsources = [] self._included_ffis = [] self._windows_unicode = None self._init_once_cache = {} self._cdef_version = None self._embedding = None if hasattr(backend, 'set_ffi'): backend.set_ffi(self) for name in backend.__dict__: if name.startswith('RTLD_'): setattr(self, name, getattr(backend, name)) # with self._lock: self.BVoidP = self._get_cached_btype(model.voidp_type) self.BCharA = self._get_cached_btype(model.char_array_type) if isinstance(backend, types.ModuleType): # _cffi_backend: attach these constants to the class if not hasattr(FFI, 'NULL'): FFI.NULL = self.cast(self.BVoidP, 0) FFI.CData, FFI.CType = backend._get_types() else: # ctypes backend: attach these constants to the instance self.NULL = self.cast(self.BVoidP, 0) self.CData, self.CType = backend._get_types() def cdef(self, csource, override=False, packed=False): """Parse the given C source. This registers all declared functions, types, and global variables. The functions and global variables can then be accessed via either 'ffi.dlopen()' or 'ffi.verify()'. The types can be used in 'ffi.new()' and other functions. If 'packed' is specified as True, all structs declared inside this cdef are packed, i.e. laid out without any field alignment at all. """ self._cdef(csource, override=override, packed=packed) def embedding_api(self, csource, packed=False): self._cdef(csource, packed=packed, dllexport=True) if self._embedding is None: self._embedding = '' def _cdef(self, csource, override=False, **options): if not isinstance(csource, str): # unicode, on Python 2 if not isinstance(csource, basestring): raise TypeError("cdef() argument must be a string") csource = csource.encode('ascii') with self._lock: self._cdef_version = object() self._parser.parse(csource, override=override, **options) self._cdefsources.append(csource) if override: for cache in self._function_caches: cache.clear() finishlist = self._parser._recomplete if finishlist: self._parser._recomplete = [] for tp in finishlist: tp.finish_backend_type(self, finishlist) def dlopen(self, name, flags=0): """Load and return a dynamic library identified by 'name'. The standard C library can be loaded by passing None. Note that functions and types declared by 'ffi.cdef()' are not linked to a particular library, just like C headers; in the library we only look for the actual (untyped) symbols. """ assert isinstance(name, basestring) or name is None with self._lock: lib, function_cache = _make_ffi_library(self, name, flags) self._function_caches.append(function_cache) self._libraries.append(lib) return lib def _typeof_locked(self, cdecl): # call me with the lock! key = cdecl if key in self._parsed_types: return self._parsed_types[key] # if not isinstance(cdecl, str): # unicode, on Python 2 cdecl = cdecl.encode('ascii') # type = self._parser.parse_type(cdecl) really_a_function_type = type.is_raw_function if really_a_function_type: type = type.as_function_pointer() btype = self._get_cached_btype(type) result = btype, really_a_function_type self._parsed_types[key] = result return result def _typeof(self, cdecl, consider_function_as_funcptr=False): # string -> ctype object try: result = self._parsed_types[cdecl] except KeyError: with self._lock: result = self._typeof_locked(cdecl) # btype, really_a_function_type = result if really_a_function_type and not consider_function_as_funcptr: raise CDefError("the type %r is a function type, not a " "pointer-to-function type" % (cdecl,)) return btype def typeof(self, cdecl): """Parse the C type given as a string and return the corresponding <ctype> object. It can also be used on 'cdata' instance to get its C type. """ if isinstance(cdecl, basestring): return self._typeof(cdecl) if isinstance(cdecl, self.CData): return self._backend.typeof(cdecl) if isinstance(cdecl, types.BuiltinFunctionType): res = _builtin_function_type(cdecl) if res is not None: return res if (isinstance(cdecl, types.FunctionType) and hasattr(cdecl, '_cffi_base_type')): with self._lock: return self._get_cached_btype(cdecl._cffi_base_type) raise TypeError(type(cdecl)) def sizeof(self, cdecl): """Return the size in bytes of the argument. It can be a string naming a C type, or a 'cdata' instance. """ if isinstance(cdecl, basestring): BType = self._typeof(cdecl) return self._backend.sizeof(BType) else: return self._backend.sizeof(cdecl) def alignof(self, cdecl): """Return the natural alignment size in bytes of the C type given as a string. """ if isinstance(cdecl, basestring): cdecl = self._typeof(cdecl) return self._backend.alignof(cdecl) def offsetof(self, cdecl, *fields_or_indexes): """Return the offset of the named field inside the given structure or array, which must be given as a C type name. You can give several field names in case of nested structures. You can also give numeric values which correspond to array items, in case of an array type. """ if isinstance(cdecl, basestring): cdecl = self._typeof(cdecl) return self._typeoffsetof(cdecl, *fields_or_indexes)[1] def new(self, cdecl, init=None): """Allocate an instance according to the specified C type and return a pointer to it. The specified C type must be either a pointer or an array: ``new('X *')`` allocates an X and returns a pointer to it, whereas ``new('X[n]')`` allocates an array of n X'es and returns an array referencing it (which works mostly like a pointer, like in C). You can also use ``new('X[]', n)`` to allocate an array of a non-constant length n. The memory is initialized following the rules of declaring a global variable in C: by default it is zero-initialized, but an explicit initializer can be given which can be used to fill all or part of the memory. When the returned <cdata> object goes out of scope, the memory is freed. In other words the returned <cdata> object has ownership of the value of type 'cdecl' that it points to. This means that the raw data can be used as long as this object is kept alive, but must not be used for a longer time. Be careful about that when copying the pointer to the memory somewhere else, e.g. into another structure. """ if isinstance(cdecl, basestring): cdecl = self._typeof(cdecl) return self._backend.newp(cdecl, init) def new_allocator(self, alloc=None, free=None, should_clear_after_alloc=True): """Return a new allocator, i.e. a function that behaves like ffi.new() but uses the provided low-level 'alloc' and 'free' functions. 'alloc' is called with the size as argument. If it returns NULL, a MemoryError is raised. 'free' is called with the result of 'alloc' as argument. Both can be either Python function or directly C functions. If 'free' is None, then no free function is called. If both 'alloc' and 'free' are None, the default is used. If 'should_clear_after_alloc' is set to False, then the memory returned by 'alloc' is assumed to be already cleared (or you are fine with garbage); otherwise CFFI will clear it. """ compiled_ffi = self._backend.FFI() allocator = compiled_ffi.new_allocator(alloc, free, should_clear_after_alloc) def allocate(cdecl, init=None): if isinstance(cdecl, basestring): cdecl = self._typeof(cdecl) return allocator(cdecl, init) return allocate def cast(self, cdecl, source): """Similar to a C cast: returns an instance of the named C type initialized with the given 'source'. The source is casted between integers or pointers of any type. """ if isinstance(cdecl, basestring): cdecl = self._typeof(cdecl) return self._backend.cast(cdecl, source) def string(self, cdata, maxlen=-1): """Return a Python string (or unicode string) from the 'cdata'. If 'cdata' is a pointer or array of characters or bytes, returns the null-terminated string. The returned string extends until the first null character, or at most 'maxlen' characters. If 'cdata' is an array then 'maxlen' defaults to its length. If 'cdata' is a pointer or array of wchar_t, returns a unicode string following the same rules. If 'cdata' is a single character or byte or a wchar_t, returns it as a string or unicode string. If 'cdata' is an enum, returns the value of the enumerator as a string, or 'NUMBER' if the value is out of range. """ return self._backend.string(cdata, maxlen) def buffer(self, cdata, size=-1): """Return a read-write buffer object that references the raw C data pointed to by the given 'cdata'. The 'cdata' must be a pointer or an array. Can be passed to functions expecting a buffer, or directly manipulated with: buf[:] get a copy of it in a regular string, or buf[idx] as a single character buf[:] = ... buf[idx] = ... change the content """ return self._backend.buffer(cdata, size) def from_buffer(self, python_buffer): """Return a <cdata 'char[]'> that points to the data of the given Python object, which must support the buffer interface. Note that this is not meant to be used on the built-in types str, unicode, or bytearray (you can build 'char[]' arrays explicitly) but only on objects containing large quantities of raw data in some other format, like 'array.array' or numpy arrays. """ return self._backend.from_buffer(self.BCharA, python_buffer) def memmove(self, dest, src, n): """ffi.memmove(dest, src, n) copies n bytes of memory from src to dest. Like the C function memmove(), the memory areas may overlap; apart from that it behaves like the C function memcpy(). 'src' can be any cdata ptr or array, or any Python buffer object. 'dest' can be any cdata ptr or array, or a writable Python buffer object. The size to copy, 'n', is always measured in bytes. Unlike other methods, this one supports all Python buffer including byte strings and bytearrays---but it still does not support non-contiguous buffers. """ return self._backend.memmove(dest, src, n) def callback(self, cdecl, python_callable=None, error=None, onerror=None): """Return a callback object or a decorator making such a callback object. 'cdecl' must name a C function pointer type. The callback invokes the specified 'python_callable' (which may be provided either directly or via a decorator). Important: the callback object must be manually kept alive for as long as the callback may be invoked from the C level. """ def callback_decorator_wrap(python_callable): if not callable(python_callable): raise TypeError("the 'python_callable' argument " "is not callable") return self._backend.callback(cdecl, python_callable, error, onerror) if isinstance(cdecl, basestring): cdecl = self._typeof(cdecl, consider_function_as_funcptr=True) if python_callable is None: return callback_decorator_wrap # decorator mode else: return callback_decorator_wrap(python_callable) # direct mode def getctype(self, cdecl, replace_with=''): """Return a string giving the C type 'cdecl', which may be itself a string or a <ctype> object. If 'replace_with' is given, it gives extra text to append (or insert for more complicated C types), like a variable name, or '*' to get actually the C type 'pointer-to-cdecl'. """ if isinstance(cdecl, basestring): cdecl = self._typeof(cdecl) replace_with = replace_with.strip() if (replace_with.startswith('*') and '&[' in self._backend.getcname(cdecl, '&')): replace_with = '(%s)' % replace_with elif replace_with and not replace_with[0] in '[(': replace_with = ' ' + replace_with return self._backend.getcname(cdecl, replace_with) def gc(self, cdata, destructor): """Return a new cdata object that points to the same data. Later, when this new cdata object is garbage-collected, 'destructor(old_cdata_object)' will be called. """ try: gcp = self._backend.gcp except AttributeError: pass else: return gcp(cdata, destructor) # with self._lock: try: gc_weakrefs = self.gc_weakrefs except AttributeError: from .gc_weakref import GcWeakrefs gc_weakrefs = self.gc_weakrefs = GcWeakrefs(self) return gc_weakrefs.build(cdata, destructor) def _get_cached_btype(self, type): assert self._lock.acquire(False) is False # call me with the lock! try: BType = self._cached_btypes[type] except KeyError: finishlist = [] BType = type.get_cached_btype(self, finishlist) for type in finishlist: type.finish_backend_type(self, finishlist) return BType def verify(self, source='', tmpdir=None, **kwargs): """Verify that the current ffi signatures compile on this machine, and return a dynamic library object. The dynamic library can be used to call functions and access global variables declared in this 'ffi'. The library is compiled by the C compiler: it gives you C-level API compatibility (including calling macros). This is unlike 'ffi.dlopen()', which requires binary compatibility in the signatures. """ from .verifier import Verifier, _caller_dir_pycache # # If set_unicode(True) was called, insert the UNICODE and # _UNICODE macro declarations if self._windows_unicode: self._apply_windows_unicode(kwargs) # # Set the tmpdir here, and not in Verifier.__init__: it picks # up the caller's directory, which we want to be the caller of # ffi.verify(), as opposed to the caller of Veritier(). tmpdir = tmpdir or _caller_dir_pycache() # # Make a Verifier() and use it to load the library. self.verifier = Verifier(self, source, tmpdir, **kwargs) lib = self.verifier.load_library() # # Save the loaded library for keep-alive purposes, even # if the caller doesn't keep it alive itself (it should). self._libraries.append(lib) return lib def _get_errno(self): return self._backend.get_errno() def _set_errno(self, errno): self._backend.set_errno(errno) errno = property(_get_errno, _set_errno, None, "the value of 'errno' from/to the C calls") def getwinerror(self, code=-1): return self._backend.getwinerror(code) def _pointer_to(self, ctype): from . import model with self._lock: return model.pointer_cache(self, ctype) def addressof(self, cdata, *fields_or_indexes): """Return the address of a <cdata 'struct-or-union'>. If 'fields_or_indexes' are given, returns the address of that field or array item in the structure or array, recursively in case of nested structures. """ ctype = self._backend.typeof(cdata) if fields_or_indexes: ctype, offset = self._typeoffsetof(ctype, *fields_or_indexes) else: if ctype.kind == "pointer": raise TypeError("addressof(pointer)") offset = 0 ctypeptr = self._pointer_to(ctype) return self._backend.rawaddressof(ctypeptr, cdata, offset) def _typeoffsetof(self, ctype, field_or_index, *fields_or_indexes): ctype, offset = self._backend.typeoffsetof(ctype, field_or_index) for field1 in fields_or_indexes: ctype, offset1 = self._backend.typeoffsetof(ctype, field1, 1) offset += offset1 return ctype, offset def include(self, ffi_to_include): """Includes the typedefs, structs, unions and enums defined in another FFI instance. Usage is similar to a #include in C, where a part of the program might include types defined in another part for its own usage. Note that the include() method has no effect on functions, constants and global variables, which must anyway be accessed directly from the lib object returned by the original FFI instance. """ if not isinstance(ffi_to_include, FFI): raise TypeError("ffi.include() expects an argument that is also of" " type cffi.FFI, not %r" % ( type(ffi_to_include).__name__,)) if ffi_to_include is self: raise ValueError("self.include(self)") with ffi_to_include._lock: with self._lock: self._parser.include(ffi_to_include._parser) self._cdefsources.append('[') self._cdefsources.extend(ffi_to_include._cdefsources) self._cdefsources.append(']') self._included_ffis.append(ffi_to_include) def new_handle(self, x): return self._backend.newp_handle(self.BVoidP, x) def from_handle(self, x): return self._backend.from_handle(x) def set_unicode(self, enabled_flag): """Windows: if 'enabled_flag' is True, enable the UNICODE and _UNICODE defines in C, and declare the types like TCHAR and LPTCSTR to be (pointers to) wchar_t. If 'enabled_flag' is False, declare these types to be (pointers to) plain 8-bit characters. This is mostly for backward compatibility; you usually want True. """ if self._windows_unicode is not None: raise ValueError("set_unicode() can only be called once") enabled_flag = bool(enabled_flag) if enabled_flag: self.cdef("typedef wchar_t TBYTE;" "typedef wchar_t TCHAR;" "typedef const wchar_t *LPCTSTR;" "typedef const wchar_t *PCTSTR;" "typedef wchar_t *LPTSTR;" "typedef wchar_t *PTSTR;" "typedef TBYTE *PTBYTE;" "typedef TCHAR *PTCHAR;") else: self.cdef("typedef char TBYTE;" "typedef char TCHAR;" "typedef const char *LPCTSTR;" "typedef const char *PCTSTR;" "typedef char *LPTSTR;" "typedef char *PTSTR;" "typedef TBYTE *PTBYTE;" "typedef TCHAR *PTCHAR;") self._windows_unicode = enabled_flag def _apply_windows_unicode(self, kwds): defmacros = kwds.get('define_macros', ()) if not isinstance(defmacros, (list, tuple)): raise TypeError("'define_macros' must be a list or tuple") defmacros = list(defmacros) + [('UNICODE', '1'), ('_UNICODE', '1')] kwds['define_macros'] = defmacros def _apply_embedding_fix(self, kwds): # must include an argument like "-lpython2.7" for the compiler def ensure(key, value): lst = kwds.setdefault(key, []) if value not in lst: lst.append(value) # if '__pypy__' in sys.builtin_module_names: if sys.platform == "win32": # we need 'libpypy-c.lib'. Right now, distributions of # pypy contain it as 'include/python27.lib'. You need # to manually copy it back to 'libpypy-c.lib'. XXX Will # be fixed in the next pypy release. pythonlib = "libpypy-c" if hasattr(sys, 'prefix'): ensure('library_dirs', sys.prefix) else: # we need 'libpypy-c.{so,dylib}', which should be by # default located in 'sys.prefix/bin' pythonlib = "pypy-c" if hasattr(sys, 'prefix'): import os ensure('library_dirs', os.path.join(sys.prefix, 'bin')) else: if sys.platform == "win32": template = "python%d%d" if hasattr(sys, 'gettotalrefcount'): template += '_d' else: try: import sysconfig except ImportError: # 2.6 from distutils import sysconfig template = "python%d.%d" if sysconfig.get_config_var('DEBUG_EXT'): template += sysconfig.get_config_var('DEBUG_EXT') pythonlib = (template % (sys.hexversion >> 24, (sys.hexversion >> 16) & 0xff)) if hasattr(sys, 'abiflags'): pythonlib += sys.abiflags ensure('libraries', pythonlib) if sys.platform == "win32": ensure('extra_link_args', '/MANIFEST') def set_source(self, module_name, source, source_extension='.c', **kwds): if hasattr(self, '_assigned_source'): raise ValueError("set_source() cannot be called several times " "per ffi object") if not isinstance(module_name, basestring): raise TypeError("'module_name' must be a string") self._assigned_source = (str(module_name), source, source_extension, kwds) def distutils_extension(self, tmpdir='build', verbose=True): from distutils.dir_util import mkpath from .recompiler import recompile # if not hasattr(self, '_assigned_source'): if hasattr(self, 'verifier'): # fallback, 'tmpdir' ignored return self.verifier.get_extension() raise ValueError("set_source() must be called before" " distutils_extension()") module_name, source, source_extension, kwds = self._assigned_source if source is None: raise TypeError("distutils_extension() is only for C extension " "modules, not for dlopen()-style pure Python " "modules") mkpath(tmpdir) ext, updated = recompile(self, module_name, source, tmpdir=tmpdir, extradir=tmpdir, source_extension=source_extension, call_c_compiler=False, **kwds) if verbose: if updated: sys.stderr.write("regenerated: %r\n" % (ext.sources[0],)) else: sys.stderr.write("not modified: %r\n" % (ext.sources[0],)) return ext def emit_c_code(self, filename): from .recompiler import recompile # if not hasattr(self, '_assigned_source'): raise ValueError("set_source() must be called before emit_c_code()") module_name, source, source_extension, kwds = self._assigned_source if source is None: raise TypeError("emit_c_code() is only for C extension modules, " "not for dlopen()-style pure Python modules") recompile(self, module_name, source, c_file=filename, call_c_compiler=False, **kwds) def emit_python_code(self, filename): from .recompiler import recompile # if not hasattr(self, '_assigned_source'): raise ValueError("set_source() must be called before emit_c_code()") module_name, source, source_extension, kwds = self._assigned_source if source is not None: raise TypeError("emit_python_code() is only for dlopen()-style " "pure Python modules, not for C extension modules") recompile(self, module_name, source, c_file=filename, call_c_compiler=False, **kwds) def compile(self, tmpdir='.', verbose=0, target=None): """The 'target' argument gives the final file name of the compiled DLL. Use '*' to force distutils' choice, suitable for regular CPython C API modules. Use a file name ending in '.*' to ask for the system's default extension for dynamic libraries (.so/.dll/.dylib). The default is '*' when building a non-embedded C API extension, and (module_name + '.*') when building an embedded library. """ from .recompiler import recompile # if not hasattr(self, '_assigned_source'): raise ValueError("set_source() must be called before compile()") module_name, source, source_extension, kwds = self._assigned_source return recompile(self, module_name, source, tmpdir=tmpdir, target=target, source_extension=source_extension, compiler_verbose=verbose, **kwds) def init_once(self, func, tag): # Read _init_once_cache[tag], which is either (False, lock) if # we're calling the function now in some thread, or (True, result). # Don't call setdefault() in most cases, to avoid allocating and # immediately freeing a lock; but still use setdefaut() to avoid # races. try: x = self._init_once_cache[tag] except KeyError: x = self._init_once_cache.setdefault(tag, (False, allocate_lock())) # Common case: we got (True, result), so we return the result. if x[0]: return x[1] # Else, it's a lock. Acquire it to serialize the following tests. with x[1]: # Read again from _init_once_cache the current status. x = self._init_once_cache[tag] if x[0]: return x[1] # Call the function and store the result back. result = func() self._init_once_cache[tag] = (True, result) return result def embedding_init_code(self, pysource): if self._embedding: raise ValueError("embedding_init_code() can only be called once") # fix 'pysource' before it gets dumped into the C file: # - remove empty lines at the beginning, so it starts at "line 1" # - dedent, if all non-empty lines are indented # - check for SyntaxErrors import re match = re.match(r'\s*\n', pysource) if match: pysource = pysource[match.end():] lines = pysource.splitlines() or [''] prefix = re.match(r'\s*', lines[0]).group() for i in range(1, len(lines)): line = lines[i] if line.rstrip(): while not line.startswith(prefix): prefix = prefix[:-1] i = len(prefix) lines = [line[i:]+'\n' for line in lines] pysource = ''.join(lines) # compile(pysource, "cffi_init", "exec") # self._embedding = pysource def def_extern(self, *args, **kwds): raise ValueError("ffi.def_extern() is only available on API-mode FFI " "objects") def _load_backend_lib(backend, name, flags): if name is None: if sys.platform != "win32": return backend.load_library(None, flags) name = "c" # Windows: load_library(None) fails, but this works # (backward compatibility hack only) try: if '.' not in name and '/' not in name: raise OSError("library not found: %r" % (name,)) return backend.load_library(name, flags) except OSError: import ctypes.util path = ctypes.util.find_library(name) if path is None: raise # propagate the original OSError return backend.load_library(path, flags) def _make_ffi_library(ffi, libname, flags): import os backend = ffi._backend backendlib = _load_backend_lib(backend, libname, flags) # def accessor_function(name): key = 'function ' + name tp, _ = ffi._parser._declarations[key] BType = ffi._get_cached_btype(tp) try: value = backendlib.load_function(BType, name) except KeyError as e: raise AttributeError('%s: %s' % (name, e)) library.__dict__[name] = value # def accessor_variable(name): key = 'variable ' + name tp, _ = ffi._parser._declarations[key] BType = ffi._get_cached_btype(tp) read_variable = backendlib.read_variable write_variable = backendlib.write_variable setattr(FFILibrary, name, property( lambda self: read_variable(BType, name), lambda self, value: write_variable(BType, name, value))) # def accessor_constant(name): raise NotImplementedError("non-integer constant '%s' cannot be " "accessed from a dlopen() library" % (name,)) # def accessor_int_constant(name): library.__dict__[name] = ffi._parser._int_constants[name] # accessors = {} accessors_version = [False] # def update_accessors(): if accessors_version[0] is ffi._cdef_version: return # from . import model for key, (tp, _) in ffi._parser._declarations.items(): if not isinstance(tp, model.EnumType): tag, name = key.split(' ', 1) if tag == 'function': accessors[name] = accessor_function elif tag == 'variable': accessors[name] = accessor_variable elif tag == 'constant': accessors[name] = accessor_constant else: for i, enumname in enumerate(tp.enumerators): def accessor_enum(name, tp=tp, i=i): tp.check_not_partial() library.__dict__[name] = tp.enumvalues[i] accessors[enumname] = accessor_enum for name in ffi._parser._int_constants: accessors.setdefault(name, accessor_int_constant) accessors_version[0] = ffi._cdef_version # def make_accessor(name): with ffi._lock: if name in library.__dict__ or name in FFILibrary.__dict__: return # added by another thread while waiting for the lock if name not in accessors: update_accessors() if name not in accessors: raise AttributeError(name) accessors[name](name) # class FFILibrary(object): def __getattr__(self, name): make_accessor(name) return getattr(self, name) def __setattr__(self, name, value): try: property = getattr(self.__class__, name) except AttributeError: make_accessor(name) setattr(self, name, value) else: property.__set__(self, value) def __dir__(self): with ffi._lock: update_accessors() return accessors.keys() # if libname is not None: try: if not isinstance(libname, str): # unicode, on Python 2 libname = libname.encode('utf-8') FFILibrary.__name__ = 'FFILibrary_%s' % libname except UnicodeError: pass library = FFILibrary() return library, library.__dict__ def _builtin_function_type(func): # a hack to make at least ffi.typeof(builtin_function) work, # if the builtin function was obtained by 'vengine_cpy'. import sys try: module = sys.modules[func.__module__] ffi = module._cffi_original_ffi types_of_builtin_funcs = module._cffi_types_of_builtin_funcs tp = types_of_builtin_funcs[func] except (KeyError, AttributeError, TypeError): return None else: with ffi._lock: return ffi._get_cached_btype(tp)