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,
23# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28from slicc.ast.StatementAST import StatementAST
29
30class ReturnStatementAST(StatementAST):
31    def __init__(self, slicc, expr_ast):
32        super(ReturnStatementAST, self).__init__(slicc)
33
34        self.expr_ast = expr_ast
35
36    def __repr__(self):
37        return "[ReturnStatementAST: %r]" % self.expr_ast
38
39    def generate(self, code, return_type):
40        actual_type, ecode = self.expr_ast.inline(True)
41        code('return $ecode;')
42
43        # Is return valid here?
44        if return_type is None:
45            self.error("Invalid 'return' statement")
46
47        # The return type must match
48        if actual_type != "OOD" and return_type != actual_type:
49            self.expr_ast.error("Return type miss-match, expected return " +
50                                "type is '%s', actual is '%s'",
51                                return_type, actual_type)
52
53    def findResources(self, resources):
54        self.expr_ast.findResources(resources)
55