913 lines
37 KiB
Python
913 lines
37 KiB
Python
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import sys, imp
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from . import model, ffiplatform
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class VCPythonEngine(object):
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_class_key = 'x'
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_gen_python_module = True
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def __init__(self, verifier):
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self.verifier = verifier
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self.ffi = verifier.ffi
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self._struct_pending_verification = {}
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self._types_of_builtin_functions = {}
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def patch_extension_kwds(self, kwds):
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pass
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def find_module(self, module_name, path, so_suffixes):
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try:
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f, filename, descr = imp.find_module(module_name, path)
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except ImportError:
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return None
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if f is not None:
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f.close()
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# Note that after a setuptools installation, there are both .py
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# and .so files with the same basename. The code here relies on
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# imp.find_module() locating the .so in priority.
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if descr[0] not in so_suffixes:
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return None
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return filename
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def collect_types(self):
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self._typesdict = {}
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self._generate("collecttype")
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def _prnt(self, what=''):
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self._f.write(what + '\n')
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def _gettypenum(self, type):
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# a KeyError here is a bug. please report it! :-)
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return self._typesdict[type]
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def _do_collect_type(self, tp):
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if ((not isinstance(tp, model.PrimitiveType)
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or tp.name == 'long double')
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and tp not in self._typesdict):
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num = len(self._typesdict)
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self._typesdict[tp] = num
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def write_source_to_f(self):
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self.collect_types()
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#
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# The new module will have a _cffi_setup() function that receives
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# objects from the ffi world, and that calls some setup code in
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# the module. This setup code is split in several independent
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# functions, e.g. one per constant. The functions are "chained"
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# by ending in a tail call to each other.
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#
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# This is further split in two chained lists, depending on if we
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# can do it at import-time or if we must wait for _cffi_setup() to
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# provide us with the <ctype> objects. This is needed because we
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# need the values of the enum constants in order to build the
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# <ctype 'enum'> that we may have to pass to _cffi_setup().
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#
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# The following two 'chained_list_constants' items contains
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# the head of these two chained lists, as a string that gives the
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# call to do, if any.
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self._chained_list_constants = ['0', '0']
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#
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prnt = self._prnt
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# first paste some standard set of lines that are mostly '#define'
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prnt(cffimod_header)
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prnt()
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# then paste the C source given by the user, verbatim.
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prnt(self.verifier.preamble)
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prnt()
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#
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# call generate_cpy_xxx_decl(), for every xxx found from
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# ffi._parser._declarations. This generates all the functions.
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self._generate("decl")
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#
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# implement the function _cffi_setup_custom() as calling the
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# head of the chained list.
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self._generate_setup_custom()
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prnt()
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#
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# produce the method table, including the entries for the
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# generated Python->C function wrappers, which are done
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# by generate_cpy_function_method().
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prnt('static PyMethodDef _cffi_methods[] = {')
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self._generate("method")
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prnt(' {"_cffi_setup", _cffi_setup, METH_VARARGS},')
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prnt(' {NULL, NULL} /* Sentinel */')
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prnt('};')
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prnt()
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#
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# standard init.
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modname = self.verifier.get_module_name()
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if sys.version_info >= (3,):
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prnt('static struct PyModuleDef _cffi_module_def = {')
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prnt(' PyModuleDef_HEAD_INIT,')
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prnt(' "%s",' % modname)
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prnt(' NULL,')
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prnt(' -1,')
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prnt(' _cffi_methods,')
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prnt(' NULL, NULL, NULL, NULL')
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prnt('};')
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prnt()
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initname = 'PyInit_%s' % modname
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createmod = 'PyModule_Create(&_cffi_module_def)'
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errorcase = 'return NULL'
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finalreturn = 'return lib'
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else:
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initname = 'init%s' % modname
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createmod = 'Py_InitModule("%s", _cffi_methods)' % modname
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errorcase = 'return'
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finalreturn = 'return'
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prnt('PyMODINIT_FUNC')
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prnt('%s(void)' % initname)
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prnt('{')
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prnt(' PyObject *lib;')
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prnt(' lib = %s;' % createmod)
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prnt(' if (lib == NULL || %s < 0)' % (
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self._chained_list_constants[False],))
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prnt(' %s;' % errorcase)
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prnt(' _cffi_init();')
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prnt(' %s;' % finalreturn)
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prnt('}')
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def load_library(self):
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# XXX review all usages of 'self' here!
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# import it as a new extension module
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try:
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module = imp.load_dynamic(self.verifier.get_module_name(),
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self.verifier.modulefilename)
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except ImportError as e:
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error = "importing %r: %s" % (self.verifier.modulefilename, e)
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raise ffiplatform.VerificationError(error)
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#
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# call loading_cpy_struct() to get the struct layout inferred by
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# the C compiler
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self._load(module, 'loading')
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#
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# the C code will need the <ctype> objects. Collect them in
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# order in a list.
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revmapping = dict([(value, key)
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for (key, value) in self._typesdict.items()])
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lst = [revmapping[i] for i in range(len(revmapping))]
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lst = list(map(self.ffi._get_cached_btype, lst))
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#
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# build the FFILibrary class and instance and call _cffi_setup().
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# this will set up some fields like '_cffi_types', and only then
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# it will invoke the chained list of functions that will really
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# build (notably) the constant objects, as <cdata> if they are
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# pointers, and store them as attributes on the 'library' object.
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class FFILibrary(object):
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_cffi_python_module = module
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_cffi_ffi = self.ffi
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_cffi_dir = []
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def __dir__(self):
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return FFILibrary._cffi_dir + list(self.__dict__)
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library = FFILibrary()
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if module._cffi_setup(lst, ffiplatform.VerificationError, library):
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import warnings
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warnings.warn("reimporting %r might overwrite older definitions"
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% (self.verifier.get_module_name()))
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#
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# finally, call the loaded_cpy_xxx() functions. This will perform
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# the final adjustments, like copying the Python->C wrapper
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# functions from the module to the 'library' object, and setting
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# up the FFILibrary class with properties for the global C variables.
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self._load(module, 'loaded', library=library)
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module._cffi_original_ffi = self.ffi
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module._cffi_types_of_builtin_funcs = self._types_of_builtin_functions
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return library
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def _get_declarations(self):
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return sorted(self.ffi._parser._declarations.items())
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def _generate(self, step_name):
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for name, tp in self._get_declarations():
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kind, realname = name.split(' ', 1)
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try:
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method = getattr(self, '_generate_cpy_%s_%s' % (kind,
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step_name))
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except AttributeError:
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raise ffiplatform.VerificationError(
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"not implemented in verify(): %r" % name)
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try:
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method(tp, realname)
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except Exception as e:
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model.attach_exception_info(e, name)
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raise
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def _load(self, module, step_name, **kwds):
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for name, tp in self._get_declarations():
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kind, realname = name.split(' ', 1)
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method = getattr(self, '_%s_cpy_%s' % (step_name, kind))
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try:
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method(tp, realname, module, **kwds)
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except Exception as e:
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model.attach_exception_info(e, name)
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raise
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def _generate_nothing(self, tp, name):
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pass
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def _loaded_noop(self, tp, name, module, **kwds):
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pass
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# ----------
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def _convert_funcarg_to_c(self, tp, fromvar, tovar, errcode):
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extraarg = ''
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if isinstance(tp, model.PrimitiveType):
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if tp.is_integer_type() and tp.name != '_Bool':
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converter = '_cffi_to_c_int'
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extraarg = ', %s' % tp.name
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else:
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converter = '_cffi_to_c_%s' % (tp.name.replace(' ', '_'),)
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errvalue = '-1'
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#
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elif isinstance(tp, model.PointerType):
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self._convert_funcarg_to_c_ptr_or_array(tp, fromvar,
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tovar, errcode)
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return
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#
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elif isinstance(tp, (model.StructOrUnion, model.EnumType)):
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# a struct (not a struct pointer) as a function argument
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self._prnt(' if (_cffi_to_c((char *)&%s, _cffi_type(%d), %s) < 0)'
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% (tovar, self._gettypenum(tp), fromvar))
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self._prnt(' %s;' % errcode)
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return
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#
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elif isinstance(tp, model.FunctionPtrType):
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converter = '(%s)_cffi_to_c_pointer' % tp.get_c_name('')
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extraarg = ', _cffi_type(%d)' % self._gettypenum(tp)
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errvalue = 'NULL'
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#
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else:
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raise NotImplementedError(tp)
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#
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self._prnt(' %s = %s(%s%s);' % (tovar, converter, fromvar, extraarg))
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self._prnt(' if (%s == (%s)%s && PyErr_Occurred())' % (
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tovar, tp.get_c_name(''), errvalue))
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self._prnt(' %s;' % errcode)
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def _extra_local_variables(self, tp, localvars):
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if isinstance(tp, model.PointerType):
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localvars.add('Py_ssize_t datasize')
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def _convert_funcarg_to_c_ptr_or_array(self, tp, fromvar, tovar, errcode):
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self._prnt(' datasize = _cffi_prepare_pointer_call_argument(')
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self._prnt(' _cffi_type(%d), %s, (char **)&%s);' % (
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self._gettypenum(tp), fromvar, tovar))
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self._prnt(' if (datasize != 0) {')
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self._prnt(' if (datasize < 0)')
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self._prnt(' %s;' % errcode)
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self._prnt(' %s = alloca(datasize);' % (tovar,))
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self._prnt(' memset((void *)%s, 0, datasize);' % (tovar,))
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self._prnt(' if (_cffi_convert_array_from_object('
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'(char *)%s, _cffi_type(%d), %s) < 0)' % (
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tovar, self._gettypenum(tp), fromvar))
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self._prnt(' %s;' % errcode)
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self._prnt(' }')
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def _convert_expr_from_c(self, tp, var, context):
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if isinstance(tp, model.PrimitiveType):
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if tp.is_integer_type():
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return '_cffi_from_c_int(%s, %s)' % (var, tp.name)
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elif tp.name != 'long double':
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return '_cffi_from_c_%s(%s)' % (tp.name.replace(' ', '_'), var)
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else:
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return '_cffi_from_c_deref((char *)&%s, _cffi_type(%d))' % (
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var, self._gettypenum(tp))
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elif isinstance(tp, (model.PointerType, model.FunctionPtrType)):
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return '_cffi_from_c_pointer((char *)%s, _cffi_type(%d))' % (
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var, self._gettypenum(tp))
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elif isinstance(tp, model.ArrayType):
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return '_cffi_from_c_pointer((char *)%s, _cffi_type(%d))' % (
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var, self._gettypenum(model.PointerType(tp.item)))
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elif isinstance(tp, model.StructType):
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if tp.fldnames is None:
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raise TypeError("'%s' is used as %s, but is opaque" % (
|
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tp._get_c_name(), context))
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return '_cffi_from_c_struct((char *)&%s, _cffi_type(%d))' % (
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var, self._gettypenum(tp))
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elif isinstance(tp, model.EnumType):
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return '_cffi_from_c_deref((char *)&%s, _cffi_type(%d))' % (
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var, self._gettypenum(tp))
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else:
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raise NotImplementedError(tp)
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# ----------
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# typedefs: generates no code so far
|
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_generate_cpy_typedef_collecttype = _generate_nothing
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_generate_cpy_typedef_decl = _generate_nothing
|
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_generate_cpy_typedef_method = _generate_nothing
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_loading_cpy_typedef = _loaded_noop
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_loaded_cpy_typedef = _loaded_noop
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# ----------
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# function declarations
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def _generate_cpy_function_collecttype(self, tp, name):
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assert isinstance(tp, model.FunctionPtrType)
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if tp.ellipsis:
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self._do_collect_type(tp)
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else:
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# don't call _do_collect_type(tp) in this common case,
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# otherwise test_autofilled_struct_as_argument fails
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for type in tp.args:
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self._do_collect_type(type)
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self._do_collect_type(tp.result)
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def _generate_cpy_function_decl(self, tp, name):
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assert isinstance(tp, model.FunctionPtrType)
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|
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if tp.ellipsis:
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# cannot support vararg functions better than this: check for its
|
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# exact type (including the fixed arguments), and build it as a
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# constant function pointer (no CPython wrapper)
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self._generate_cpy_const(False, name, tp)
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return
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prnt = self._prnt
|
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numargs = len(tp.args)
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|
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if numargs == 0:
|
||
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argname = 'no_arg'
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elif numargs == 1:
|
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argname = 'arg0'
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|
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else:
|
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|
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argname = 'args'
|
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|
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prnt('static PyObject *')
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||
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prnt('_cffi_f_%s(PyObject *self, PyObject *%s)' % (name, argname))
|
||
|
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prnt('{')
|
||
|
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#
|
||
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context = 'argument of %s' % name
|
||
|
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for i, type in enumerate(tp.args):
|
||
|
|
prnt(' %s;' % type.get_c_name(' x%d' % i, context))
|
||
|
|
#
|
||
|
|
localvars = set()
|
||
|
|
for type in tp.args:
|
||
|
|
self._extra_local_variables(type, localvars)
|
||
|
|
for decl in localvars:
|
||
|
|
prnt(' %s;' % (decl,))
|
||
|
|
#
|
||
|
|
if not isinstance(tp.result, model.VoidType):
|
||
|
|
result_code = 'result = '
|
||
|
|
context = 'result of %s' % name
|
||
|
|
prnt(' %s;' % tp.result.get_c_name(' result', context))
|
||
|
|
else:
|
||
|
|
result_code = ''
|
||
|
|
#
|
||
|
|
if len(tp.args) > 1:
|
||
|
|
rng = range(len(tp.args))
|
||
|
|
for i in rng:
|
||
|
|
prnt(' PyObject *arg%d;' % i)
|
||
|
|
prnt()
|
||
|
|
prnt(' if (!PyArg_ParseTuple(args, "%s:%s", %s))' % (
|
||
|
|
'O' * numargs, name, ', '.join(['&arg%d' % i for i in rng])))
|
||
|
|
prnt(' return NULL;')
|
||
|
|
prnt()
|
||
|
|
#
|
||
|
|
for i, type in enumerate(tp.args):
|
||
|
|
self._convert_funcarg_to_c(type, 'arg%d' % i, 'x%d' % i,
|
||
|
|
'return NULL')
|
||
|
|
prnt()
|
||
|
|
#
|
||
|
|
prnt(' Py_BEGIN_ALLOW_THREADS')
|
||
|
|
prnt(' _cffi_restore_errno();')
|
||
|
|
prnt(' { %s%s(%s); }' % (
|
||
|
|
result_code, name,
|
||
|
|
', '.join(['x%d' % i for i in range(len(tp.args))])))
|
||
|
|
prnt(' _cffi_save_errno();')
|
||
|
|
prnt(' Py_END_ALLOW_THREADS')
|
||
|
|
prnt()
|
||
|
|
#
|
||
|
|
if result_code:
|
||
|
|
prnt(' return %s;' %
|
||
|
|
self._convert_expr_from_c(tp.result, 'result', 'result type'))
|
||
|
|
else:
|
||
|
|
prnt(' Py_INCREF(Py_None);')
|
||
|
|
prnt(' return Py_None;')
|
||
|
|
prnt('}')
|
||
|
|
prnt()
|
||
|
|
|
||
|
|
def _generate_cpy_function_method(self, tp, name):
|
||
|
|
if tp.ellipsis:
|
||
|
|
return
|
||
|
|
numargs = len(tp.args)
|
||
|
|
if numargs == 0:
|
||
|
|
meth = 'METH_NOARGS'
|
||
|
|
elif numargs == 1:
|
||
|
|
meth = 'METH_O'
|
||
|
|
else:
|
||
|
|
meth = 'METH_VARARGS'
|
||
|
|
self._prnt(' {"%s", _cffi_f_%s, %s},' % (name, name, meth))
|
||
|
|
|
||
|
|
_loading_cpy_function = _loaded_noop
|
||
|
|
|
||
|
|
def _loaded_cpy_function(self, tp, name, module, library):
|
||
|
|
if tp.ellipsis:
|
||
|
|
return
|
||
|
|
func = getattr(module, name)
|
||
|
|
setattr(library, name, func)
|
||
|
|
self._types_of_builtin_functions[func] = tp
|
||
|
|
|
||
|
|
# ----------
|
||
|
|
# named structs
|
||
|
|
|
||
|
|
_generate_cpy_struct_collecttype = _generate_nothing
|
||
|
|
def _generate_cpy_struct_decl(self, tp, name):
|
||
|
|
assert name == tp.name
|
||
|
|
self._generate_struct_or_union_decl(tp, 'struct', name)
|
||
|
|
def _generate_cpy_struct_method(self, tp, name):
|
||
|
|
self._generate_struct_or_union_method(tp, 'struct', name)
|
||
|
|
def _loading_cpy_struct(self, tp, name, module):
|
||
|
|
self._loading_struct_or_union(tp, 'struct', name, module)
|
||
|
|
def _loaded_cpy_struct(self, tp, name, module, **kwds):
|
||
|
|
self._loaded_struct_or_union(tp)
|
||
|
|
|
||
|
|
_generate_cpy_union_collecttype = _generate_nothing
|
||
|
|
def _generate_cpy_union_decl(self, tp, name):
|
||
|
|
assert name == tp.name
|
||
|
|
self._generate_struct_or_union_decl(tp, 'union', name)
|
||
|
|
def _generate_cpy_union_method(self, tp, name):
|
||
|
|
self._generate_struct_or_union_method(tp, 'union', name)
|
||
|
|
def _loading_cpy_union(self, tp, name, module):
|
||
|
|
self._loading_struct_or_union(tp, 'union', name, module)
|
||
|
|
def _loaded_cpy_union(self, tp, name, module, **kwds):
|
||
|
|
self._loaded_struct_or_union(tp)
|
||
|
|
|
||
|
|
def _generate_struct_or_union_decl(self, tp, prefix, name):
|
||
|
|
if tp.fldnames is None:
|
||
|
|
return # nothing to do with opaque structs
|
||
|
|
checkfuncname = '_cffi_check_%s_%s' % (prefix, name)
|
||
|
|
layoutfuncname = '_cffi_layout_%s_%s' % (prefix, name)
|
||
|
|
cname = ('%s %s' % (prefix, name)).strip()
|
||
|
|
#
|
||
|
|
prnt = self._prnt
|
||
|
|
prnt('static void %s(%s *p)' % (checkfuncname, cname))
|
||
|
|
prnt('{')
|
||
|
|
prnt(' /* only to generate compile-time warnings or errors */')
|
||
|
|
for fname, ftype, fbitsize in tp.enumfields():
|
||
|
|
if (isinstance(ftype, model.PrimitiveType)
|
||
|
|
and ftype.is_integer_type()) or fbitsize >= 0:
|
||
|
|
# accept all integers, but complain on float or double
|
||
|
|
prnt(' (void)((p->%s) << 1);' % fname)
|
||
|
|
else:
|
||
|
|
# only accept exactly the type declared.
|
||
|
|
try:
|
||
|
|
prnt(' { %s = &p->%s; (void)tmp; }' % (
|
||
|
|
ftype.get_c_name('*tmp', 'field %r'%fname), fname))
|
||
|
|
except ffiplatform.VerificationError as e:
|
||
|
|
prnt(' /* %s */' % str(e)) # cannot verify it, ignore
|
||
|
|
prnt('}')
|
||
|
|
prnt('static PyObject *')
|
||
|
|
prnt('%s(PyObject *self, PyObject *noarg)' % (layoutfuncname,))
|
||
|
|
prnt('{')
|
||
|
|
prnt(' struct _cffi_aligncheck { char x; %s y; };' % cname)
|
||
|
|
prnt(' static Py_ssize_t nums[] = {')
|
||
|
|
prnt(' sizeof(%s),' % cname)
|
||
|
|
prnt(' offsetof(struct _cffi_aligncheck, y),')
|
||
|
|
for fname, ftype, fbitsize in tp.enumfields():
|
||
|
|
if fbitsize >= 0:
|
||
|
|
continue # xxx ignore fbitsize for now
|
||
|
|
prnt(' offsetof(%s, %s),' % (cname, fname))
|
||
|
|
if isinstance(ftype, model.ArrayType) and ftype.length is None:
|
||
|
|
prnt(' 0, /* %s */' % ftype._get_c_name())
|
||
|
|
else:
|
||
|
|
prnt(' sizeof(((%s *)0)->%s),' % (cname, fname))
|
||
|
|
prnt(' -1')
|
||
|
|
prnt(' };')
|
||
|
|
prnt(' return _cffi_get_struct_layout(nums);')
|
||
|
|
prnt(' /* the next line is not executed, but compiled */')
|
||
|
|
prnt(' %s(0);' % (checkfuncname,))
|
||
|
|
prnt('}')
|
||
|
|
prnt()
|
||
|
|
|
||
|
|
def _generate_struct_or_union_method(self, tp, prefix, name):
|
||
|
|
if tp.fldnames is None:
|
||
|
|
return # nothing to do with opaque structs
|
||
|
|
layoutfuncname = '_cffi_layout_%s_%s' % (prefix, name)
|
||
|
|
self._prnt(' {"%s", %s, METH_NOARGS},' % (layoutfuncname,
|
||
|
|
layoutfuncname))
|
||
|
|
|
||
|
|
def _loading_struct_or_union(self, tp, prefix, name, module):
|
||
|
|
if tp.fldnames is None:
|
||
|
|
return # nothing to do with opaque structs
|
||
|
|
layoutfuncname = '_cffi_layout_%s_%s' % (prefix, name)
|
||
|
|
#
|
||
|
|
function = getattr(module, layoutfuncname)
|
||
|
|
layout = function()
|
||
|
|
if isinstance(tp, model.StructOrUnion) and tp.partial:
|
||
|
|
# use the function()'s sizes and offsets to guide the
|
||
|
|
# layout of the struct
|
||
|
|
totalsize = layout[0]
|
||
|
|
totalalignment = layout[1]
|
||
|
|
fieldofs = layout[2::2]
|
||
|
|
fieldsize = layout[3::2]
|
||
|
|
tp.force_flatten()
|
||
|
|
assert len(fieldofs) == len(fieldsize) == len(tp.fldnames)
|
||
|
|
tp.fixedlayout = fieldofs, fieldsize, totalsize, totalalignment
|
||
|
|
else:
|
||
|
|
cname = ('%s %s' % (prefix, name)).strip()
|
||
|
|
self._struct_pending_verification[tp] = layout, cname
|
||
|
|
|
||
|
|
def _loaded_struct_or_union(self, tp):
|
||
|
|
if tp.fldnames is None:
|
||
|
|
return # nothing to do with opaque structs
|
||
|
|
self.ffi._get_cached_btype(tp) # force 'fixedlayout' to be considered
|
||
|
|
|
||
|
|
if tp in self._struct_pending_verification:
|
||
|
|
# check that the layout sizes and offsets match the real ones
|
||
|
|
def check(realvalue, expectedvalue, msg):
|
||
|
|
if realvalue != expectedvalue:
|
||
|
|
raise ffiplatform.VerificationError(
|
||
|
|
"%s (we have %d, but C compiler says %d)"
|
||
|
|
% (msg, expectedvalue, realvalue))
|
||
|
|
ffi = self.ffi
|
||
|
|
BStruct = ffi._get_cached_btype(tp)
|
||
|
|
layout, cname = self._struct_pending_verification.pop(tp)
|
||
|
|
check(layout[0], ffi.sizeof(BStruct), "wrong total size")
|
||
|
|
check(layout[1], ffi.alignof(BStruct), "wrong total alignment")
|
||
|
|
i = 2
|
||
|
|
for fname, ftype, fbitsize in tp.enumfields():
|
||
|
|
if fbitsize >= 0:
|
||
|
|
continue # xxx ignore fbitsize for now
|
||
|
|
check(layout[i], ffi.offsetof(BStruct, fname),
|
||
|
|
"wrong offset for field %r" % (fname,))
|
||
|
|
if layout[i+1] != 0:
|
||
|
|
BField = ffi._get_cached_btype(ftype)
|
||
|
|
check(layout[i+1], ffi.sizeof(BField),
|
||
|
|
"wrong size for field %r" % (fname,))
|
||
|
|
i += 2
|
||
|
|
assert i == len(layout)
|
||
|
|
|
||
|
|
# ----------
|
||
|
|
# 'anonymous' declarations. These are produced for anonymous structs
|
||
|
|
# or unions; the 'name' is obtained by a typedef.
|
||
|
|
|
||
|
|
_generate_cpy_anonymous_collecttype = _generate_nothing
|
||
|
|
|
||
|
|
def _generate_cpy_anonymous_decl(self, tp, name):
|
||
|
|
if isinstance(tp, model.EnumType):
|
||
|
|
self._generate_cpy_enum_decl(tp, name, '')
|
||
|
|
else:
|
||
|
|
self._generate_struct_or_union_decl(tp, '', name)
|
||
|
|
|
||
|
|
def _generate_cpy_anonymous_method(self, tp, name):
|
||
|
|
if not isinstance(tp, model.EnumType):
|
||
|
|
self._generate_struct_or_union_method(tp, '', name)
|
||
|
|
|
||
|
|
def _loading_cpy_anonymous(self, tp, name, module):
|
||
|
|
if isinstance(tp, model.EnumType):
|
||
|
|
self._loading_cpy_enum(tp, name, module)
|
||
|
|
else:
|
||
|
|
self._loading_struct_or_union(tp, '', name, module)
|
||
|
|
|
||
|
|
def _loaded_cpy_anonymous(self, tp, name, module, **kwds):
|
||
|
|
if isinstance(tp, model.EnumType):
|
||
|
|
self._loaded_cpy_enum(tp, name, module, **kwds)
|
||
|
|
else:
|
||
|
|
self._loaded_struct_or_union(tp)
|
||
|
|
|
||
|
|
# ----------
|
||
|
|
# constants, likely declared with '#define'
|
||
|
|
|
||
|
|
def _generate_cpy_const(self, is_int, name, tp=None, category='const',
|
||
|
|
vartp=None, delayed=True, size_too=False):
|
||
|
|
prnt = self._prnt
|
||
|
|
funcname = '_cffi_%s_%s' % (category, name)
|
||
|
|
prnt('static int %s(PyObject *lib)' % funcname)
|
||
|
|
prnt('{')
|
||
|
|
prnt(' PyObject *o;')
|
||
|
|
prnt(' int res;')
|
||
|
|
if not is_int:
|
||
|
|
prnt(' %s;' % (vartp or tp).get_c_name(' i', name))
|
||
|
|
else:
|
||
|
|
assert category == 'const'
|
||
|
|
#
|
||
|
|
if not is_int:
|
||
|
|
if category == 'var':
|
||
|
|
realexpr = '&' + name
|
||
|
|
else:
|
||
|
|
realexpr = name
|
||
|
|
prnt(' i = (%s);' % (realexpr,))
|
||
|
|
prnt(' o = %s;' % (self._convert_expr_from_c(tp, 'i',
|
||
|
|
'variable type'),))
|
||
|
|
assert delayed
|
||
|
|
else:
|
||
|
|
prnt(' if (LONG_MIN <= (%s) && (%s) <= LONG_MAX)' % (name, name))
|
||
|
|
prnt(' o = PyInt_FromLong((long)(%s));' % (name,))
|
||
|
|
prnt(' else if ((%s) <= 0)' % (name,))
|
||
|
|
prnt(' o = PyLong_FromLongLong((long long)(%s));' % (name,))
|
||
|
|
prnt(' else')
|
||
|
|
prnt(' o = PyLong_FromUnsignedLongLong('
|
||
|
|
'(unsigned long long)(%s));' % (name,))
|
||
|
|
prnt(' if (o == NULL)')
|
||
|
|
prnt(' return -1;')
|
||
|
|
if size_too:
|
||
|
|
prnt(' {')
|
||
|
|
prnt(' PyObject *o1 = o;')
|
||
|
|
prnt(' o = Py_BuildValue("On", o1, (Py_ssize_t)sizeof(%s));'
|
||
|
|
% (name,))
|
||
|
|
prnt(' Py_DECREF(o1);')
|
||
|
|
prnt(' if (o == NULL)')
|
||
|
|
prnt(' return -1;')
|
||
|
|
prnt(' }')
|
||
|
|
prnt(' res = PyObject_SetAttrString(lib, "%s", o);' % name)
|
||
|
|
prnt(' Py_DECREF(o);')
|
||
|
|
prnt(' if (res < 0)')
|
||
|
|
prnt(' return -1;')
|
||
|
|
prnt(' return %s;' % self._chained_list_constants[delayed])
|
||
|
|
self._chained_list_constants[delayed] = funcname + '(lib)'
|
||
|
|
prnt('}')
|
||
|
|
prnt()
|
||
|
|
|
||
|
|
def _generate_cpy_constant_collecttype(self, tp, name):
|
||
|
|
is_int = isinstance(tp, model.PrimitiveType) and tp.is_integer_type()
|
||
|
|
if not is_int:
|
||
|
|
self._do_collect_type(tp)
|
||
|
|
|
||
|
|
def _generate_cpy_constant_decl(self, tp, name):
|
||
|
|
is_int = isinstance(tp, model.PrimitiveType) and tp.is_integer_type()
|
||
|
|
self._generate_cpy_const(is_int, name, tp)
|
||
|
|
|
||
|
|
_generate_cpy_constant_method = _generate_nothing
|
||
|
|
_loading_cpy_constant = _loaded_noop
|
||
|
|
_loaded_cpy_constant = _loaded_noop
|
||
|
|
|
||
|
|
# ----------
|
||
|
|
# enums
|
||
|
|
|
||
|
|
def _generate_cpy_enum_decl(self, tp, name, prefix='enum'):
|
||
|
|
if tp.partial:
|
||
|
|
for enumerator in tp.enumerators:
|
||
|
|
self._generate_cpy_const(True, enumerator, delayed=False)
|
||
|
|
return
|
||
|
|
#
|
||
|
|
funcname = '_cffi_e_%s_%s' % (prefix, name)
|
||
|
|
prnt = self._prnt
|
||
|
|
prnt('static int %s(PyObject *lib)' % funcname)
|
||
|
|
prnt('{')
|
||
|
|
for enumerator, enumvalue in zip(tp.enumerators, tp.enumvalues):
|
||
|
|
if enumvalue < 0:
|
||
|
|
prnt(' if ((%s) >= 0 || (long)(%s) != %dL) {' % (
|
||
|
|
enumerator, enumerator, enumvalue))
|
||
|
|
else:
|
||
|
|
prnt(' if ((%s) < 0 || (unsigned long)(%s) != %dUL) {' % (
|
||
|
|
enumerator, enumerator, enumvalue))
|
||
|
|
prnt(' char buf[64];')
|
||
|
|
prnt(' if ((%s) < 0)' % enumerator)
|
||
|
|
prnt(' snprintf(buf, 63, "%%ld", (long)(%s));' % enumerator)
|
||
|
|
prnt(' else')
|
||
|
|
prnt(' snprintf(buf, 63, "%%lu", (unsigned long)(%s));' %
|
||
|
|
enumerator)
|
||
|
|
prnt(' PyErr_Format(_cffi_VerificationError,')
|
||
|
|
prnt(' "enum %s: %s has the real value %s, '
|
||
|
|
'not %s",')
|
||
|
|
prnt(' "%s", "%s", buf, "%d");' % (
|
||
|
|
name, enumerator, enumvalue))
|
||
|
|
prnt(' return -1;')
|
||
|
|
prnt(' }')
|
||
|
|
prnt(' return %s;' % self._chained_list_constants[True])
|
||
|
|
self._chained_list_constants[True] = funcname + '(lib)'
|
||
|
|
prnt('}')
|
||
|
|
prnt()
|
||
|
|
|
||
|
|
_generate_cpy_enum_collecttype = _generate_nothing
|
||
|
|
_generate_cpy_enum_method = _generate_nothing
|
||
|
|
|
||
|
|
def _loading_cpy_enum(self, tp, name, module):
|
||
|
|
if tp.partial:
|
||
|
|
enumvalues = [getattr(module, enumerator)
|
||
|
|
for enumerator in tp.enumerators]
|
||
|
|
tp.enumvalues = tuple(enumvalues)
|
||
|
|
tp.partial_resolved = True
|
||
|
|
|
||
|
|
def _loaded_cpy_enum(self, tp, name, module, library):
|
||
|
|
for enumerator, enumvalue in zip(tp.enumerators, tp.enumvalues):
|
||
|
|
setattr(library, enumerator, enumvalue)
|
||
|
|
|
||
|
|
# ----------
|
||
|
|
# macros: for now only for integers
|
||
|
|
|
||
|
|
def _generate_cpy_macro_decl(self, tp, name):
|
||
|
|
assert tp == '...'
|
||
|
|
self._generate_cpy_const(True, name)
|
||
|
|
|
||
|
|
_generate_cpy_macro_collecttype = _generate_nothing
|
||
|
|
_generate_cpy_macro_method = _generate_nothing
|
||
|
|
_loading_cpy_macro = _loaded_noop
|
||
|
|
_loaded_cpy_macro = _loaded_noop
|
||
|
|
|
||
|
|
# ----------
|
||
|
|
# global variables
|
||
|
|
|
||
|
|
def _generate_cpy_variable_collecttype(self, tp, name):
|
||
|
|
if isinstance(tp, model.ArrayType):
|
||
|
|
tp_ptr = model.PointerType(tp.item)
|
||
|
|
else:
|
||
|
|
tp_ptr = model.PointerType(tp)
|
||
|
|
self._do_collect_type(tp_ptr)
|
||
|
|
|
||
|
|
def _generate_cpy_variable_decl(self, tp, name):
|
||
|
|
if isinstance(tp, model.ArrayType):
|
||
|
|
tp_ptr = model.PointerType(tp.item)
|
||
|
|
self._generate_cpy_const(False, name, tp, vartp=tp_ptr,
|
||
|
|
size_too = (tp.length == '...'))
|
||
|
|
else:
|
||
|
|
tp_ptr = model.PointerType(tp)
|
||
|
|
self._generate_cpy_const(False, name, tp_ptr, category='var')
|
||
|
|
|
||
|
|
_generate_cpy_variable_method = _generate_nothing
|
||
|
|
_loading_cpy_variable = _loaded_noop
|
||
|
|
|
||
|
|
def _loaded_cpy_variable(self, tp, name, module, library):
|
||
|
|
value = getattr(library, name)
|
||
|
|
if isinstance(tp, model.ArrayType): # int a[5] is "constant" in the
|
||
|
|
# sense that "a=..." is forbidden
|
||
|
|
if tp.length == '...':
|
||
|
|
assert isinstance(value, tuple)
|
||
|
|
(value, size) = value
|
||
|
|
BItemType = self.ffi._get_cached_btype(tp.item)
|
||
|
|
length, rest = divmod(size, self.ffi.sizeof(BItemType))
|
||
|
|
if rest != 0:
|
||
|
|
raise ffiplatform.VerificationError(
|
||
|
|
"bad size: %r does not seem to be an array of %s" %
|
||
|
|
(name, tp.item))
|
||
|
|
tp = tp.resolve_length(length)
|
||
|
|
# 'value' is a <cdata 'type *'> which we have to replace with
|
||
|
|
# a <cdata 'type[N]'> if the N is actually known
|
||
|
|
if tp.length is not None:
|
||
|
|
BArray = self.ffi._get_cached_btype(tp)
|
||
|
|
value = self.ffi.cast(BArray, value)
|
||
|
|
setattr(library, name, value)
|
||
|
|
return
|
||
|
|
# remove ptr=<cdata 'int *'> from the library instance, and replace
|
||
|
|
# it by a property on the class, which reads/writes into ptr[0].
|
||
|
|
ptr = value
|
||
|
|
delattr(library, name)
|
||
|
|
def getter(library):
|
||
|
|
return ptr[0]
|
||
|
|
def setter(library, value):
|
||
|
|
ptr[0] = value
|
||
|
|
setattr(type(library), name, property(getter, setter))
|
||
|
|
type(library)._cffi_dir.append(name)
|
||
|
|
|
||
|
|
# ----------
|
||
|
|
|
||
|
|
def _generate_setup_custom(self):
|
||
|
|
prnt = self._prnt
|
||
|
|
prnt('static int _cffi_setup_custom(PyObject *lib)')
|
||
|
|
prnt('{')
|
||
|
|
prnt(' return %s;' % self._chained_list_constants[True])
|
||
|
|
prnt('}')
|
||
|
|
|
||
|
|
cffimod_header = r'''
|
||
|
|
#include <Python.h>
|
||
|
|
#include <stddef.h>
|
||
|
|
|
||
|
|
#ifdef MS_WIN32
|
||
|
|
#include <malloc.h> /* for alloca() */
|
||
|
|
typedef __int8 int8_t;
|
||
|
|
typedef __int16 int16_t;
|
||
|
|
typedef __int32 int32_t;
|
||
|
|
typedef __int64 int64_t;
|
||
|
|
typedef unsigned __int8 uint8_t;
|
||
|
|
typedef unsigned __int16 uint16_t;
|
||
|
|
typedef unsigned __int32 uint32_t;
|
||
|
|
typedef unsigned __int64 uint64_t;
|
||
|
|
typedef unsigned char _Bool;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if PY_MAJOR_VERSION < 3
|
||
|
|
# undef PyCapsule_CheckExact
|
||
|
|
# undef PyCapsule_GetPointer
|
||
|
|
# define PyCapsule_CheckExact(capsule) (PyCObject_Check(capsule))
|
||
|
|
# define PyCapsule_GetPointer(capsule, name) \
|
||
|
|
(PyCObject_AsVoidPtr(capsule))
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if PY_MAJOR_VERSION >= 3
|
||
|
|
# define PyInt_FromLong PyLong_FromLong
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define _cffi_from_c_double PyFloat_FromDouble
|
||
|
|
#define _cffi_from_c_float PyFloat_FromDouble
|
||
|
|
#define _cffi_from_c_long PyInt_FromLong
|
||
|
|
#define _cffi_from_c_ulong PyLong_FromUnsignedLong
|
||
|
|
#define _cffi_from_c_longlong PyLong_FromLongLong
|
||
|
|
#define _cffi_from_c_ulonglong PyLong_FromUnsignedLongLong
|
||
|
|
|
||
|
|
#define _cffi_to_c_double PyFloat_AsDouble
|
||
|
|
#define _cffi_to_c_float PyFloat_AsDouble
|
||
|
|
|
||
|
|
#define _cffi_from_c_int(x, type) \
|
||
|
|
(((type)-1) > 0 ? /* unsigned */ \
|
||
|
|
(sizeof(type) < sizeof(long) ? PyInt_FromLong(x) : \
|
||
|
|
sizeof(type) == sizeof(long) ? PyLong_FromUnsignedLong(x) : \
|
||
|
|
PyLong_FromUnsignedLongLong(x)) \
|
||
|
|
: (sizeof(type) <= sizeof(long) ? PyInt_FromLong(x) : \
|
||
|
|
PyLong_FromLongLong(x)))
|
||
|
|
|
||
|
|
#define _cffi_to_c_int(o, type) \
|
||
|
|
(sizeof(type) == 1 ? (((type)-1) > 0 ? _cffi_to_c_u8(o) \
|
||
|
|
: _cffi_to_c_i8(o)) : \
|
||
|
|
sizeof(type) == 2 ? (((type)-1) > 0 ? _cffi_to_c_u16(o) \
|
||
|
|
: _cffi_to_c_i16(o)) : \
|
||
|
|
sizeof(type) == 4 ? (((type)-1) > 0 ? _cffi_to_c_u32(o) \
|
||
|
|
: _cffi_to_c_i32(o)) : \
|
||
|
|
sizeof(type) == 8 ? (((type)-1) > 0 ? _cffi_to_c_u64(o) \
|
||
|
|
: _cffi_to_c_i64(o)) : \
|
||
|
|
(Py_FatalError("unsupported size for type " #type), 0))
|
||
|
|
|
||
|
|
#define _cffi_to_c_i8 \
|
||
|
|
((int(*)(PyObject *))_cffi_exports[1])
|
||
|
|
#define _cffi_to_c_u8 \
|
||
|
|
((int(*)(PyObject *))_cffi_exports[2])
|
||
|
|
#define _cffi_to_c_i16 \
|
||
|
|
((int(*)(PyObject *))_cffi_exports[3])
|
||
|
|
#define _cffi_to_c_u16 \
|
||
|
|
((int(*)(PyObject *))_cffi_exports[4])
|
||
|
|
#define _cffi_to_c_i32 \
|
||
|
|
((int(*)(PyObject *))_cffi_exports[5])
|
||
|
|
#define _cffi_to_c_u32 \
|
||
|
|
((unsigned int(*)(PyObject *))_cffi_exports[6])
|
||
|
|
#define _cffi_to_c_i64 \
|
||
|
|
((long long(*)(PyObject *))_cffi_exports[7])
|
||
|
|
#define _cffi_to_c_u64 \
|
||
|
|
((unsigned long long(*)(PyObject *))_cffi_exports[8])
|
||
|
|
#define _cffi_to_c_char \
|
||
|
|
((int(*)(PyObject *))_cffi_exports[9])
|
||
|
|
#define _cffi_from_c_pointer \
|
||
|
|
((PyObject *(*)(char *, CTypeDescrObject *))_cffi_exports[10])
|
||
|
|
#define _cffi_to_c_pointer \
|
||
|
|
((char *(*)(PyObject *, CTypeDescrObject *))_cffi_exports[11])
|
||
|
|
#define _cffi_get_struct_layout \
|
||
|
|
((PyObject *(*)(Py_ssize_t[]))_cffi_exports[12])
|
||
|
|
#define _cffi_restore_errno \
|
||
|
|
((void(*)(void))_cffi_exports[13])
|
||
|
|
#define _cffi_save_errno \
|
||
|
|
((void(*)(void))_cffi_exports[14])
|
||
|
|
#define _cffi_from_c_char \
|
||
|
|
((PyObject *(*)(char))_cffi_exports[15])
|
||
|
|
#define _cffi_from_c_deref \
|
||
|
|
((PyObject *(*)(char *, CTypeDescrObject *))_cffi_exports[16])
|
||
|
|
#define _cffi_to_c \
|
||
|
|
((int(*)(char *, CTypeDescrObject *, PyObject *))_cffi_exports[17])
|
||
|
|
#define _cffi_from_c_struct \
|
||
|
|
((PyObject *(*)(char *, CTypeDescrObject *))_cffi_exports[18])
|
||
|
|
#define _cffi_to_c_wchar_t \
|
||
|
|
((wchar_t(*)(PyObject *))_cffi_exports[19])
|
||
|
|
#define _cffi_from_c_wchar_t \
|
||
|
|
((PyObject *(*)(wchar_t))_cffi_exports[20])
|
||
|
|
#define _cffi_to_c_long_double \
|
||
|
|
((long double(*)(PyObject *))_cffi_exports[21])
|
||
|
|
#define _cffi_to_c__Bool \
|
||
|
|
((_Bool(*)(PyObject *))_cffi_exports[22])
|
||
|
|
#define _cffi_prepare_pointer_call_argument \
|
||
|
|
((Py_ssize_t(*)(CTypeDescrObject *, PyObject *, char **))_cffi_exports[23])
|
||
|
|
#define _cffi_convert_array_from_object \
|
||
|
|
((int(*)(char *, CTypeDescrObject *, PyObject *))_cffi_exports[24])
|
||
|
|
#define _CFFI_NUM_EXPORTS 25
|
||
|
|
|
||
|
|
typedef struct _ctypedescr CTypeDescrObject;
|
||
|
|
|
||
|
|
static void *_cffi_exports[_CFFI_NUM_EXPORTS];
|
||
|
|
static PyObject *_cffi_types, *_cffi_VerificationError;
|
||
|
|
|
||
|
|
static int _cffi_setup_custom(PyObject *lib); /* forward */
|
||
|
|
|
||
|
|
static PyObject *_cffi_setup(PyObject *self, PyObject *args)
|
||
|
|
{
|
||
|
|
PyObject *library;
|
||
|
|
int was_alive = (_cffi_types != NULL);
|
||
|
|
if (!PyArg_ParseTuple(args, "OOO", &_cffi_types, &_cffi_VerificationError,
|
||
|
|
&library))
|
||
|
|
return NULL;
|
||
|
|
Py_INCREF(_cffi_types);
|
||
|
|
Py_INCREF(_cffi_VerificationError);
|
||
|
|
if (_cffi_setup_custom(library) < 0)
|
||
|
|
return NULL;
|
||
|
|
return PyBool_FromLong(was_alive);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void _cffi_init(void)
|
||
|
|
{
|
||
|
|
PyObject *module = PyImport_ImportModule("_cffi_backend");
|
||
|
|
PyObject *c_api_object;
|
||
|
|
|
||
|
|
if (module == NULL)
|
||
|
|
return;
|
||
|
|
|
||
|
|
c_api_object = PyObject_GetAttrString(module, "_C_API");
|
||
|
|
if (c_api_object == NULL)
|
||
|
|
return;
|
||
|
|
if (!PyCapsule_CheckExact(c_api_object)) {
|
||
|
|
Py_DECREF(c_api_object);
|
||
|
|
PyErr_SetNone(PyExc_ImportError);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
memcpy(_cffi_exports, PyCapsule_GetPointer(c_api_object, "cffi"),
|
||
|
|
_CFFI_NUM_EXPORTS * sizeof(void *));
|
||
|
|
Py_DECREF(c_api_object);
|
||
|
|
}
|
||
|
|
|
||
|
|
#define _cffi_type(num) ((CTypeDescrObject *)PyList_GET_ITEM(_cffi_types, num))
|
||
|
|
|
||
|
|
/**********/
|
||
|
|
'''
|