AssignStatementAST.py revision 6999 
1# Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
2# Copyright (c) 2009 The Hewlett-Packard Development Company
3# All rights reserved.
4#
5# Redistribution and use in source and binary forms, with or without
6# modification, are permitted provided that the following conditions are
7# met: redistributions of source code must retain the above copyright
8# notice, this list of conditions and the following disclaimer;
9# redistributions in binary form must reproduce the above copyright
10# notice, this list of conditions and the following disclaimer in the
11# documentation and/or other materials provided with the distribution;
12# neither the name of the copyright holders nor the names of its
13# contributors may be used to endorse or promote products derived from
14# this software without specific prior written permission.
15#
16# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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26# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28from slicc.ast.StatementAST import StatementAST
29
30class AssignStatementAST(StatementAST):
31    def __init__(self, slicc, lvalue, rvalue):
32        super(AssignStatementAST, self).__init__(slicc)
33        self.lvalue = lvalue
34        self.rvalue = rvalue
35
36    def __repr__(self):
37        return "[AssignStatementAST: %r := %r]" % (self.lvalue, self.rvalue)
38
39    def generate(self, code, return_type):
40        lcode = self.slicc.codeFormatter()
41        rcode = self.slicc.codeFormatter()
42
43        ltype = self.lvalue.generate(lcode)
44        rtype = self.rvalue.generate(rcode)
45
46        code("$lcode = $rcode;")
47
48        if ltype != rtype:
49            # FIXME - beckmann
50            # the following if statement is a hack to allow NetDest
51            # objects to be assigned to Sets this allows for the
52            # previous NetworkMessage Destiantion 'Set class' to
53            # migrate to the new NetworkMessage Destiantion 'NetDest
54            # class'
55            if str(ltype) != "NetDest" and str(rtype) != "Set":
56                self.error("Assignment type mismatch '%s' and '%s'",
57                           ltype, rtype)
58