618 lines
21 KiB
Python
618 lines
21 KiB
Python
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import types
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import weakref
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from .lock import allocate_lock
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from .error import CDefError, VerificationError, VerificationMissing
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# type qualifiers
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Q_CONST = 0x01
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Q_RESTRICT = 0x02
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Q_VOLATILE = 0x04
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def qualify(quals, replace_with):
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if quals & Q_CONST:
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replace_with = ' const ' + replace_with.lstrip()
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if quals & Q_VOLATILE:
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replace_with = ' volatile ' + replace_with.lstrip()
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if quals & Q_RESTRICT:
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# It seems that __restrict is supported by gcc and msvc.
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# If you hit some different compiler, add a #define in
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# _cffi_include.h for it (and in its copies, documented there)
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replace_with = ' __restrict ' + replace_with.lstrip()
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return replace_with
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class BaseTypeByIdentity(object):
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is_array_type = False
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is_raw_function = False
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def get_c_name(self, replace_with='', context='a C file', quals=0):
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result = self.c_name_with_marker
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assert result.count('&') == 1
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# some logic duplication with ffi.getctype()... :-(
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replace_with = replace_with.strip()
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if replace_with:
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if replace_with.startswith('*') and '&[' in result:
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replace_with = '(%s)' % replace_with
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elif not replace_with[0] in '[(':
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replace_with = ' ' + replace_with
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replace_with = qualify(quals, replace_with)
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result = result.replace('&', replace_with)
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if '$' in result:
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raise VerificationError(
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"cannot generate '%s' in %s: unknown type name"
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% (self._get_c_name(), context))
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return result
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def _get_c_name(self):
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return self.c_name_with_marker.replace('&', '')
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def has_c_name(self):
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return '$' not in self._get_c_name()
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def is_integer_type(self):
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return False
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def get_cached_btype(self, ffi, finishlist, can_delay=False):
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try:
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BType = ffi._cached_btypes[self]
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except KeyError:
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BType = self.build_backend_type(ffi, finishlist)
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BType2 = ffi._cached_btypes.setdefault(self, BType)
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assert BType2 is BType
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return BType
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def __repr__(self):
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return '<%s>' % (self._get_c_name(),)
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def _get_items(self):
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return [(name, getattr(self, name)) for name in self._attrs_]
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class BaseType(BaseTypeByIdentity):
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def __eq__(self, other):
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return (self.__class__ == other.__class__ and
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self._get_items() == other._get_items())
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def __ne__(self, other):
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return not self == other
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def __hash__(self):
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return hash((self.__class__, tuple(self._get_items())))
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class VoidType(BaseType):
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_attrs_ = ()
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def __init__(self):
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self.c_name_with_marker = 'void&'
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def build_backend_type(self, ffi, finishlist):
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return global_cache(self, ffi, 'new_void_type')
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void_type = VoidType()
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class BasePrimitiveType(BaseType):
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def is_complex_type(self):
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return False
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class PrimitiveType(BasePrimitiveType):
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_attrs_ = ('name',)
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ALL_PRIMITIVE_TYPES = {
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'char': 'c',
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'short': 'i',
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'int': 'i',
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'long': 'i',
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'long long': 'i',
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'signed char': 'i',
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'unsigned char': 'i',
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'unsigned short': 'i',
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'unsigned int': 'i',
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'unsigned long': 'i',
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'unsigned long long': 'i',
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'float': 'f',
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'double': 'f',
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'long double': 'f',
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'float _Complex': 'j',
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'double _Complex': 'j',
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'_Bool': 'i',
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# the following types are not primitive in the C sense
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'wchar_t': 'c',
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'char16_t': 'c',
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'char32_t': 'c',
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'int8_t': 'i',
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'uint8_t': 'i',
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'int16_t': 'i',
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'uint16_t': 'i',
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'int32_t': 'i',
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'uint32_t': 'i',
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'int64_t': 'i',
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'uint64_t': 'i',
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'int_least8_t': 'i',
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'uint_least8_t': 'i',
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'int_least16_t': 'i',
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'uint_least16_t': 'i',
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'int_least32_t': 'i',
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'uint_least32_t': 'i',
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'int_least64_t': 'i',
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'uint_least64_t': 'i',
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'int_fast8_t': 'i',
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'uint_fast8_t': 'i',
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'int_fast16_t': 'i',
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'uint_fast16_t': 'i',
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'int_fast32_t': 'i',
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'uint_fast32_t': 'i',
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'int_fast64_t': 'i',
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'uint_fast64_t': 'i',
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'intptr_t': 'i',
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'uintptr_t': 'i',
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'intmax_t': 'i',
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'uintmax_t': 'i',
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'ptrdiff_t': 'i',
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'size_t': 'i',
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'ssize_t': 'i',
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}
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def __init__(self, name):
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assert name in self.ALL_PRIMITIVE_TYPES
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self.name = name
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self.c_name_with_marker = name + '&'
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def is_char_type(self):
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return self.ALL_PRIMITIVE_TYPES[self.name] == 'c'
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def is_integer_type(self):
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return self.ALL_PRIMITIVE_TYPES[self.name] == 'i'
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def is_float_type(self):
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return self.ALL_PRIMITIVE_TYPES[self.name] == 'f'
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def is_complex_type(self):
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return self.ALL_PRIMITIVE_TYPES[self.name] == 'j'
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def build_backend_type(self, ffi, finishlist):
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return global_cache(self, ffi, 'new_primitive_type', self.name)
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class UnknownIntegerType(BasePrimitiveType):
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_attrs_ = ('name',)
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def __init__(self, name):
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self.name = name
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self.c_name_with_marker = name + '&'
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def is_integer_type(self):
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return True
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def build_backend_type(self, ffi, finishlist):
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raise NotImplementedError("integer type '%s' can only be used after "
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"compilation" % self.name)
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class UnknownFloatType(BasePrimitiveType):
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_attrs_ = ('name', )
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def __init__(self, name):
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self.name = name
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self.c_name_with_marker = name + '&'
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def build_backend_type(self, ffi, finishlist):
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raise NotImplementedError("float type '%s' can only be used after "
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"compilation" % self.name)
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class BaseFunctionType(BaseType):
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_attrs_ = ('args', 'result', 'ellipsis', 'abi')
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def __init__(self, args, result, ellipsis, abi=None):
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self.args = args
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self.result = result
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self.ellipsis = ellipsis
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self.abi = abi
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#
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reprargs = [arg._get_c_name() for arg in self.args]
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if self.ellipsis:
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reprargs.append('...')
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reprargs = reprargs or ['void']
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replace_with = self._base_pattern % (', '.join(reprargs),)
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if abi is not None:
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replace_with = replace_with[:1] + abi + ' ' + replace_with[1:]
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self.c_name_with_marker = (
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self.result.c_name_with_marker.replace('&', replace_with))
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class RawFunctionType(BaseFunctionType):
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# Corresponds to a C type like 'int(int)', which is the C type of
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# a function, but not a pointer-to-function. The backend has no
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# notion of such a type; it's used temporarily by parsing.
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_base_pattern = '(&)(%s)'
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is_raw_function = True
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def build_backend_type(self, ffi, finishlist):
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raise CDefError("cannot render the type %r: it is a function "
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"type, not a pointer-to-function type" % (self,))
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def as_function_pointer(self):
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return FunctionPtrType(self.args, self.result, self.ellipsis, self.abi)
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class FunctionPtrType(BaseFunctionType):
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_base_pattern = '(*&)(%s)'
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def build_backend_type(self, ffi, finishlist):
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result = self.result.get_cached_btype(ffi, finishlist)
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args = []
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for tp in self.args:
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args.append(tp.get_cached_btype(ffi, finishlist))
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abi_args = ()
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if self.abi == "__stdcall":
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if not self.ellipsis: # __stdcall ignored for variadic funcs
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try:
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abi_args = (ffi._backend.FFI_STDCALL,)
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except AttributeError:
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pass
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return global_cache(self, ffi, 'new_function_type',
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tuple(args), result, self.ellipsis, *abi_args)
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def as_raw_function(self):
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return RawFunctionType(self.args, self.result, self.ellipsis, self.abi)
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class PointerType(BaseType):
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_attrs_ = ('totype', 'quals')
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def __init__(self, totype, quals=0):
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self.totype = totype
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self.quals = quals
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extra = qualify(quals, " *&")
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if totype.is_array_type:
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extra = "(%s)" % (extra.lstrip(),)
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self.c_name_with_marker = totype.c_name_with_marker.replace('&', extra)
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def build_backend_type(self, ffi, finishlist):
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BItem = self.totype.get_cached_btype(ffi, finishlist, can_delay=True)
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return global_cache(self, ffi, 'new_pointer_type', BItem)
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voidp_type = PointerType(void_type)
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def ConstPointerType(totype):
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return PointerType(totype, Q_CONST)
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const_voidp_type = ConstPointerType(void_type)
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class NamedPointerType(PointerType):
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_attrs_ = ('totype', 'name')
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def __init__(self, totype, name, quals=0):
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PointerType.__init__(self, totype, quals)
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self.name = name
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self.c_name_with_marker = name + '&'
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class ArrayType(BaseType):
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_attrs_ = ('item', 'length')
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is_array_type = True
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def __init__(self, item, length):
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self.item = item
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self.length = length
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#
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if length is None:
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brackets = '&[]'
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elif length == '...':
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brackets = '&[/*...*/]'
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else:
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brackets = '&[%s]' % length
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self.c_name_with_marker = (
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self.item.c_name_with_marker.replace('&', brackets))
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def length_is_unknown(self):
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return isinstance(self.length, str)
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def resolve_length(self, newlength):
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return ArrayType(self.item, newlength)
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def build_backend_type(self, ffi, finishlist):
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if self.length_is_unknown():
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raise CDefError("cannot render the type %r: unknown length" %
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(self,))
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self.item.get_cached_btype(ffi, finishlist) # force the item BType
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BPtrItem = PointerType(self.item).get_cached_btype(ffi, finishlist)
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return global_cache(self, ffi, 'new_array_type', BPtrItem, self.length)
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char_array_type = ArrayType(PrimitiveType('char'), None)
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class StructOrUnionOrEnum(BaseTypeByIdentity):
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_attrs_ = ('name',)
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forcename = None
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def build_c_name_with_marker(self):
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name = self.forcename or '%s %s' % (self.kind, self.name)
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self.c_name_with_marker = name + '&'
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def force_the_name(self, forcename):
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self.forcename = forcename
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self.build_c_name_with_marker()
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def get_official_name(self):
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assert self.c_name_with_marker.endswith('&')
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return self.c_name_with_marker[:-1]
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class StructOrUnion(StructOrUnionOrEnum):
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fixedlayout = None
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completed = 0
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partial = False
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packed = 0
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def __init__(self, name, fldnames, fldtypes, fldbitsize, fldquals=None):
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self.name = name
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self.fldnames = fldnames
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self.fldtypes = fldtypes
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self.fldbitsize = fldbitsize
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self.fldquals = fldquals
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self.build_c_name_with_marker()
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def anonymous_struct_fields(self):
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if self.fldtypes is not None:
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for name, type in zip(self.fldnames, self.fldtypes):
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if name == '' and isinstance(type, StructOrUnion):
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yield type
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def enumfields(self, expand_anonymous_struct_union=True):
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fldquals = self.fldquals
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if fldquals is None:
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fldquals = (0,) * len(self.fldnames)
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|
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for name, type, bitsize, quals in zip(self.fldnames, self.fldtypes,
|
||
|
|
self.fldbitsize, fldquals):
|
||
|
|
if (name == '' and isinstance(type, StructOrUnion)
|
||
|
|
and expand_anonymous_struct_union):
|
||
|
|
# nested anonymous struct/union
|
||
|
|
for result in type.enumfields():
|
||
|
|
yield result
|
||
|
|
else:
|
||
|
|
yield (name, type, bitsize, quals)
|
||
|
|
|
||
|
|
def force_flatten(self):
|
||
|
|
# force the struct or union to have a declaration that lists
|
||
|
|
# directly all fields returned by enumfields(), flattening
|
||
|
|
# nested anonymous structs/unions.
|
||
|
|
names = []
|
||
|
|
types = []
|
||
|
|
bitsizes = []
|
||
|
|
fldquals = []
|
||
|
|
for name, type, bitsize, quals in self.enumfields():
|
||
|
|
names.append(name)
|
||
|
|
types.append(type)
|
||
|
|
bitsizes.append(bitsize)
|
||
|
|
fldquals.append(quals)
|
||
|
|
self.fldnames = tuple(names)
|
||
|
|
self.fldtypes = tuple(types)
|
||
|
|
self.fldbitsize = tuple(bitsizes)
|
||
|
|
self.fldquals = tuple(fldquals)
|
||
|
|
|
||
|
|
def get_cached_btype(self, ffi, finishlist, can_delay=False):
|
||
|
|
BType = StructOrUnionOrEnum.get_cached_btype(self, ffi, finishlist,
|
||
|
|
can_delay)
|
||
|
|
if not can_delay:
|
||
|
|
self.finish_backend_type(ffi, finishlist)
|
||
|
|
return BType
|
||
|
|
|
||
|
|
def finish_backend_type(self, ffi, finishlist):
|
||
|
|
if self.completed:
|
||
|
|
if self.completed != 2:
|
||
|
|
raise NotImplementedError("recursive structure declaration "
|
||
|
|
"for '%s'" % (self.name,))
|
||
|
|
return
|
||
|
|
BType = ffi._cached_btypes[self]
|
||
|
|
#
|
||
|
|
self.completed = 1
|
||
|
|
#
|
||
|
|
if self.fldtypes is None:
|
||
|
|
pass # not completing it: it's an opaque struct
|
||
|
|
#
|
||
|
|
elif self.fixedlayout is None:
|
||
|
|
fldtypes = [tp.get_cached_btype(ffi, finishlist)
|
||
|
|
for tp in self.fldtypes]
|
||
|
|
lst = list(zip(self.fldnames, fldtypes, self.fldbitsize))
|
||
|
|
extra_flags = ()
|
||
|
|
if self.packed:
|
||
|
|
if self.packed == 1:
|
||
|
|
extra_flags = (8,) # SF_PACKED
|
||
|
|
else:
|
||
|
|
extra_flags = (0, self.packed)
|
||
|
|
ffi._backend.complete_struct_or_union(BType, lst, self,
|
||
|
|
-1, -1, *extra_flags)
|
||
|
|
#
|
||
|
|
else:
|
||
|
|
fldtypes = []
|
||
|
|
fieldofs, fieldsize, totalsize, totalalignment = self.fixedlayout
|
||
|
|
for i in range(len(self.fldnames)):
|
||
|
|
fsize = fieldsize[i]
|
||
|
|
ftype = self.fldtypes[i]
|
||
|
|
#
|
||
|
|
if isinstance(ftype, ArrayType) and ftype.length_is_unknown():
|
||
|
|
# fix the length to match the total size
|
||
|
|
BItemType = ftype.item.get_cached_btype(ffi, finishlist)
|
||
|
|
nlen, nrest = divmod(fsize, ffi.sizeof(BItemType))
|
||
|
|
if nrest != 0:
|
||
|
|
self._verification_error(
|
||
|
|
"field '%s.%s' has a bogus size?" % (
|
||
|
|
self.name, self.fldnames[i] or '{}'))
|
||
|
|
ftype = ftype.resolve_length(nlen)
|
||
|
|
self.fldtypes = (self.fldtypes[:i] + (ftype,) +
|
||
|
|
self.fldtypes[i+1:])
|
||
|
|
#
|
||
|
|
BFieldType = ftype.get_cached_btype(ffi, finishlist)
|
||
|
|
if isinstance(ftype, ArrayType) and ftype.length is None:
|
||
|
|
assert fsize == 0
|
||
|
|
else:
|
||
|
|
bitemsize = ffi.sizeof(BFieldType)
|
||
|
|
if bitemsize != fsize:
|
||
|
|
self._verification_error(
|
||
|
|
"field '%s.%s' is declared as %d bytes, but is "
|
||
|
|
"really %d bytes" % (self.name,
|
||
|
|
self.fldnames[i] or '{}',
|
||
|
|
bitemsize, fsize))
|
||
|
|
fldtypes.append(BFieldType)
|
||
|
|
#
|
||
|
|
lst = list(zip(self.fldnames, fldtypes, self.fldbitsize, fieldofs))
|
||
|
|
ffi._backend.complete_struct_or_union(BType, lst, self,
|
||
|
|
totalsize, totalalignment)
|
||
|
|
self.completed = 2
|
||
|
|
|
||
|
|
def _verification_error(self, msg):
|
||
|
|
raise VerificationError(msg)
|
||
|
|
|
||
|
|
def check_not_partial(self):
|
||
|
|
if self.partial and self.fixedlayout is None:
|
||
|
|
raise VerificationMissing(self._get_c_name())
|
||
|
|
|
||
|
|
def build_backend_type(self, ffi, finishlist):
|
||
|
|
self.check_not_partial()
|
||
|
|
finishlist.append(self)
|
||
|
|
#
|
||
|
|
return global_cache(self, ffi, 'new_%s_type' % self.kind,
|
||
|
|
self.get_official_name(), key=self)
|
||
|
|
|
||
|
|
|
||
|
|
class StructType(StructOrUnion):
|
||
|
|
kind = 'struct'
|
||
|
|
|
||
|
|
|
||
|
|
class UnionType(StructOrUnion):
|
||
|
|
kind = 'union'
|
||
|
|
|
||
|
|
|
||
|
|
class EnumType(StructOrUnionOrEnum):
|
||
|
|
kind = 'enum'
|
||
|
|
partial = False
|
||
|
|
partial_resolved = False
|
||
|
|
|
||
|
|
def __init__(self, name, enumerators, enumvalues, baseinttype=None):
|
||
|
|
self.name = name
|
||
|
|
self.enumerators = enumerators
|
||
|
|
self.enumvalues = enumvalues
|
||
|
|
self.baseinttype = baseinttype
|
||
|
|
self.build_c_name_with_marker()
|
||
|
|
|
||
|
|
def force_the_name(self, forcename):
|
||
|
|
StructOrUnionOrEnum.force_the_name(self, forcename)
|
||
|
|
if self.forcename is None:
|
||
|
|
name = self.get_official_name()
|
||
|
|
self.forcename = '$' + name.replace(' ', '_')
|
||
|
|
|
||
|
|
def check_not_partial(self):
|
||
|
|
if self.partial and not self.partial_resolved:
|
||
|
|
raise VerificationMissing(self._get_c_name())
|
||
|
|
|
||
|
|
def build_backend_type(self, ffi, finishlist):
|
||
|
|
self.check_not_partial()
|
||
|
|
base_btype = self.build_baseinttype(ffi, finishlist)
|
||
|
|
return global_cache(self, ffi, 'new_enum_type',
|
||
|
|
self.get_official_name(),
|
||
|
|
self.enumerators, self.enumvalues,
|
||
|
|
base_btype, key=self)
|
||
|
|
|
||
|
|
def build_baseinttype(self, ffi, finishlist):
|
||
|
|
if self.baseinttype is not None:
|
||
|
|
return self.baseinttype.get_cached_btype(ffi, finishlist)
|
||
|
|
#
|
||
|
|
if self.enumvalues:
|
||
|
|
smallest_value = min(self.enumvalues)
|
||
|
|
largest_value = max(self.enumvalues)
|
||
|
|
else:
|
||
|
|
import warnings
|
||
|
|
try:
|
||
|
|
# XXX! The goal is to ensure that the warnings.warn()
|
||
|
|
# will not suppress the warning. We want to get it
|
||
|
|
# several times if we reach this point several times.
|
||
|
|
__warningregistry__.clear()
|
||
|
|
except NameError:
|
||
|
|
pass
|
||
|
|
warnings.warn("%r has no values explicitly defined; "
|
||
|
|
"guessing that it is equivalent to 'unsigned int'"
|
||
|
|
% self._get_c_name())
|
||
|
|
smallest_value = largest_value = 0
|
||
|
|
if smallest_value < 0: # needs a signed type
|
||
|
|
sign = 1
|
||
|
|
candidate1 = PrimitiveType("int")
|
||
|
|
candidate2 = PrimitiveType("long")
|
||
|
|
else:
|
||
|
|
sign = 0
|
||
|
|
candidate1 = PrimitiveType("unsigned int")
|
||
|
|
candidate2 = PrimitiveType("unsigned long")
|
||
|
|
btype1 = candidate1.get_cached_btype(ffi, finishlist)
|
||
|
|
btype2 = candidate2.get_cached_btype(ffi, finishlist)
|
||
|
|
size1 = ffi.sizeof(btype1)
|
||
|
|
size2 = ffi.sizeof(btype2)
|
||
|
|
if (smallest_value >= ((-1) << (8*size1-1)) and
|
||
|
|
largest_value < (1 << (8*size1-sign))):
|
||
|
|
return btype1
|
||
|
|
if (smallest_value >= ((-1) << (8*size2-1)) and
|
||
|
|
largest_value < (1 << (8*size2-sign))):
|
||
|
|
return btype2
|
||
|
|
raise CDefError("%s values don't all fit into either 'long' "
|
||
|
|
"or 'unsigned long'" % self._get_c_name())
|
||
|
|
|
||
|
|
def unknown_type(name, structname=None):
|
||
|
|
if structname is None:
|
||
|
|
structname = '$%s' % name
|
||
|
|
tp = StructType(structname, None, None, None)
|
||
|
|
tp.force_the_name(name)
|
||
|
|
tp.origin = "unknown_type"
|
||
|
|
return tp
|
||
|
|
|
||
|
|
def unknown_ptr_type(name, structname=None):
|
||
|
|
if structname is None:
|
||
|
|
structname = '$$%s' % name
|
||
|
|
tp = StructType(structname, None, None, None)
|
||
|
|
return NamedPointerType(tp, name)
|
||
|
|
|
||
|
|
|
||
|
|
global_lock = allocate_lock()
|
||
|
|
_typecache_cffi_backend = weakref.WeakValueDictionary()
|
||
|
|
|
||
|
|
def get_typecache(backend):
|
||
|
|
# returns _typecache_cffi_backend if backend is the _cffi_backend
|
||
|
|
# module, or type(backend).__typecache if backend is an instance of
|
||
|
|
# CTypesBackend (or some FakeBackend class during tests)
|
||
|
|
if isinstance(backend, types.ModuleType):
|
||
|
|
return _typecache_cffi_backend
|
||
|
|
with global_lock:
|
||
|
|
if not hasattr(type(backend), '__typecache'):
|
||
|
|
type(backend).__typecache = weakref.WeakValueDictionary()
|
||
|
|
return type(backend).__typecache
|
||
|
|
|
||
|
|
def global_cache(srctype, ffi, funcname, *args, **kwds):
|
||
|
|
key = kwds.pop('key', (funcname, args))
|
||
|
|
assert not kwds
|
||
|
|
try:
|
||
|
|
return ffi._typecache[key]
|
||
|
|
except KeyError:
|
||
|
|
pass
|
||
|
|
try:
|
||
|
|
res = getattr(ffi._backend, funcname)(*args)
|
||
|
|
except NotImplementedError as e:
|
||
|
|
raise NotImplementedError("%s: %r: %s" % (funcname, srctype, e))
|
||
|
|
# note that setdefault() on WeakValueDictionary is not atomic
|
||
|
|
# and contains a rare bug (http://bugs.python.org/issue19542);
|
||
|
|
# we have to use a lock and do it ourselves
|
||
|
|
cache = ffi._typecache
|
||
|
|
with global_lock:
|
||
|
|
res1 = cache.get(key)
|
||
|
|
if res1 is None:
|
||
|
|
cache[key] = res
|
||
|
|
return res
|
||
|
|
else:
|
||
|
|
return res1
|
||
|
|
|
||
|
|
def pointer_cache(ffi, BType):
|
||
|
|
return global_cache('?', ffi, 'new_pointer_type', BType)
|
||
|
|
|
||
|
|
def attach_exception_info(e, name):
|
||
|
|
if e.args and type(e.args[0]) is str:
|
||
|
|
e.args = ('%s: %s' % (name, e.args[0]),) + e.args[1:]
|