--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/python/asmnodes.py	Sun Jun 09 16:06:49 2013 +0200
@@ -0,0 +1,57 @@
+
+""" Assembler AST nodes """
+
+class ANode:
+    def __eq__(self, other):
+        return self.__repr__() == other.__repr__()
+
+class ALabel(ANode):
+    def __init__(self, name):
+        self.name = name
+    def __repr__(self):
+        return '{0}:'.format(self.name)
+
+class AInstruction(ANode):
+    def __init__(self, opcode, operands):
+        self.opcode = opcode
+        self.operands = operands
+    def __repr__(self):
+        ops = ', '.join(map(str, self.operands))
+        return '{0} {1}'.format(self.opcode, ops)
+
+class AExpression(ANode):
+    def __add__(self, other):
+        assert isinstance(other, AExpression)
+        return ABinop('+', self, other)
+    def __mul__(self, other):
+        assert isinstance(other, AExpression)
+        return ABinop('*', self, other)
+
+class ABinop(AExpression):
+    def __init__(self, op, arg1, arg2):
+        self.op = op
+        self.arg1 = arg1
+        self.arg2 = arg2
+    def __repr__(self):
+        return '{0} {1} {2}'.format(self.op, self.arg1, self.arg2)
+
+class AUnop(AExpression):
+    def __init__(self, op, arg):
+        self.op = op
+        self.arg = arg
+    def __repr__(self):
+        return '{0} {1}'.format(self.op, self.arg)
+
+class ASymbol(AExpression):
+    def __init__(self, name):
+        self.name = name
+    def __repr__(self):
+        return self.name
+
+class ANumber(AExpression):
+    def __init__(self, n):
+        assert type(n) is int
+        self.n = n
+    def __repr__(self):
+        return '{0}'.format(self.n)
+