1# Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
2# Copyright (c) 2009 The Hewlett-Packard Development Company
3# Copyright (c) 2013 Advanced Micro Devices, Inc.
4# All rights reserved.
5#
6# Redistribution and use in source and binary forms, with or without
7# modification, are permitted provided that the following conditions are
8# met: redistributions of source code must retain the above copyright
9# notice, this list of conditions and the following disclaimer;
10# redistributions in binary form must reproduce the above copyright
11# notice, this list of conditions and the following disclaimer in the
12# documentation and/or other materials provided with the distribution;
13# neither the name of the copyright holders nor the names of its
14# contributors may be used to endorse or promote products derived from
15# this software without specific prior written permission.
16#
17# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29from slicc.ast.ExprAST import ExprAST
30from slicc.symbols import Type, Var
31
32class VarExprAST(ExprAST):
33    def __init__(self, slicc, var):
34        super(VarExprAST, self).__init__(slicc)
35        self._var = var
36
37    def __repr__(self):
38        return "[VarExprAST: %r]" % self._var
39
40    @property
41    def name(self):
42        return str(self._var)
43
44    @property
45    def var(self):
46        var = self.symtab.find(self._var, Var)
47        if not var:
48            self.error("Unrecognized variable: %s", self._var)
49        return var
50
51    def assertType(self, type_ident):
52        expected_type = self.symtab.find(type_ident, Type)
53
54        if not expected_type:
55            self.error("There must be a type '%s' declared in this scope",
56                       type_ident)
57
58        if self.var.type != expected_type:
59            self.error("Incorrect type: " + \
60                       "'%s' is expected to be type '%s' not '%s'",
61                       self.var.ident, expected_type, self.var.type)
62
63    def generate(self, code):
64        fix = code.nofix()
65        code("${{self.var.code}}")
66        code.fix(fix)
67        return self.var.type
68