MemberExprAST.py revision 8192:be38f7b6ad9e 
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
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26# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28from slicc.ast.ExprAST import ExprAST
29
30class MemberExprAST(ExprAST):
31    def __init__(self, slicc, expr_ast, field):
32        super(MemberExprAST, self).__init__(slicc)
33
34        self.expr_ast = expr_ast
35        self.field = field
36
37    def __repr__(self):
38        return "[MemberExprAST: %r.%r]" % (self.expr_ast, self.field)
39
40    def generate(self, code):
41        return_type, gcode = self.expr_ast.inline(True)
42        fix = code.nofix()
43
44        if str(return_type) == "TBE" or ("interface" in return_type and return_type["interface"] == "AbstractCacheEntry"):
45            code("(*$gcode).m_${{self.field}}")
46        else:
47            code("($gcode).m_${{self.field}}")
48
49        code.fix(fix)
50
51        # Verify that this is a valid field name for this type
52        if self.field not in return_type.data_members:
53            self.error("Invalid object field: " +
54                       "Type '%s' does not have data member %s" % \
55                       (return_type, self.field))
56
57        # Return the type of the field
58        return return_type.data_members[self.field].type
59