in functions/source/KeyGen/cffi/recompiler.py [0:0]
def _struct_ctx(self, tp, cname, approxname, named_ptr=None):
type_index = self._typesdict[tp]
reason_for_not_expanding = None
flags = []
if isinstance(tp, model.UnionType):
flags.append("_CFFI_F_UNION")
if tp.fldtypes is None:
flags.append("_CFFI_F_OPAQUE")
reason_for_not_expanding = "opaque"
if (tp not in self.ffi._parser._included_declarations and
(named_ptr is None or
named_ptr not in self.ffi._parser._included_declarations)):
if tp.fldtypes is None:
pass # opaque
elif tp.partial or any(tp.anonymous_struct_fields()):
pass # field layout obtained silently from the C compiler
else:
flags.append("_CFFI_F_CHECK_FIELDS")
if tp.packed:
if tp.packed > 1:
raise NotImplementedError(
"%r is declared with 'pack=%r'; only 0 or 1 are "
"supported in API mode (try to use \"...;\", which "
"does not require a 'pack' declaration)" %
(tp, tp.packed))
flags.append("_CFFI_F_PACKED")
else:
flags.append("_CFFI_F_EXTERNAL")
reason_for_not_expanding = "external"
flags = '|'.join(flags) or '0'
c_fields = []
if reason_for_not_expanding is None:
expand_anonymous_struct_union = not self.target_is_python
enumfields = list(tp.enumfields(expand_anonymous_struct_union))
for fldname, fldtype, fbitsize, fqual in enumfields:
fldtype = self._field_type(tp, fldname, fldtype)
self._check_not_opaque(fldtype,
"field '%s.%s'" % (tp.name, fldname))
# cname is None for _add_missing_struct_unions() only
op = OP_NOOP
if fbitsize >= 0:
op = OP_BITFIELD
size = '%d /* bits */' % fbitsize
elif cname is None or (
isinstance(fldtype, model.ArrayType) and
fldtype.length is None):
size = '(size_t)-1'
else:
size = 'sizeof(((%s)0)->%s)' % (
tp.get_c_name('*') if named_ptr is None
else named_ptr.name,
fldname)
if cname is None or fbitsize >= 0:
offset = '(size_t)-1'
elif named_ptr is not None:
offset = '((char *)&((%s)0)->%s) - (char *)0' % (
named_ptr.name, fldname)
else:
offset = 'offsetof(%s, %s)' % (tp.get_c_name(''), fldname)
c_fields.append(
FieldExpr(fldname, offset, size, fbitsize,
CffiOp(op, self._typesdict[fldtype])))
first_field_index = len(self._lsts["field"])
self._lsts["field"].extend(c_fields)
#
if cname is None: # unknown name, for _add_missing_struct_unions
size = '(size_t)-2'
align = -2
comment = "unnamed"
else:
if named_ptr is not None:
size = 'sizeof(*(%s)0)' % (named_ptr.name,)
align = '-1 /* unknown alignment */'
else:
size = 'sizeof(%s)' % (cname,)
align = 'offsetof(struct _cffi_align_%s, y)' % (approxname,)
comment = None
else:
size = '(size_t)-1'
align = -1
first_field_index = -1
comment = reason_for_not_expanding
self._lsts["struct_union"].append(
StructUnionExpr(tp.name, type_index, flags, size, align, comment,
first_field_index, c_fields))
self._seen_struct_unions.add(tp)