Struct.__id += 1
self.name = name
- self.members = []
-
- # Eliminate anonymous unions
- for type, name in members:
- if name is not None or isinstance(type, Polymorphic):
- self.members.append((type, name))
- else:
- assert isinstance(type, Union)
- assert type.name is None
- self.members.extend(type.members)
+ self.members = members
def visit(self, visitor, *args, **kwargs):
return visitor.visitStruct(self, *args, **kwargs)
-class Union(Type):
-
- __id = 0
-
- def __init__(self, name, members):
- Type.__init__(self, name)
-
- self.id = Union.__id
- Union.__id += 1
-
- self.name = name
- self.members = members
-
-def Union_(kindExpr, kindTypes, contextLess=True):
+def Union(kindExpr, kindTypes, contextLess=True):
switchTypes = []
for kindCase, kindType, kindMemberName in kindTypes:
switchType = Struct(None, [(kindType, kindMemberName)])
self.types.append(type)
+class ExpanderMixin:
+ '''Mixin class that provides a bunch of methods to expand C expressions
+ from the specifications.'''
+
+ __structs = None
+ __indices = None
+
+ def expand(self, expr):
+ # Expand a C expression, replacing certain variables
+ if not isinstance(expr, basestring):
+ return expr
+ variables = {}
+
+ if self.__structs is not None:
+ variables['self'] = '(%s)' % self.__structs[0]
+ if self.__indices is not None:
+ variables['i'] = self.__indices[0]
+
+ expandedExpr = expr.format(**variables)
+ if expandedExpr != expr and 0:
+ sys.stderr.write(" %r -> %r\n" % (expr, expandedExpr))
+ return expandedExpr
+
+ def visitMember(self, member, structInstance, *args, **kwargs):
+ memberType, memberName = member
+ if memberName is None:
+ # Anonymous structure/union member
+ memberInstance = structInstance
+ else:
+ memberInstance = '(%s).%s' % (structInstance, memberName)
+ self.__structs = (structInstance, self.__structs)
+ try:
+ return self.visit(memberType, memberInstance, *args, **kwargs)
+ finally:
+ _, self.__structs = self.__structs
+
+ def visitElement(self, elementIndex, elementType, *args, **kwargs):
+ self.__indices = (elementIndex, self.__indices)
+ try:
+ return self.visit(elementType, *args, **kwargs)
+ finally:
+ _, self.__indices = self.__indices
+
class Module:
'''A collection of functions.'''