ActionDeclAST.py revision 6657 
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
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22# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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27
28from m5.util import code_formatter
29
30from slicc.ast.DeclAST import DeclAST
31from slicc.symbols import Action, Type, Var
32
33class ActionDeclAST(DeclAST):
34    def __init__(self, slicc, ident, pairs, statement_list):
35        super(ActionDeclAST, self).__init__(slicc, pairs)
36        self.ident = ident
37        self.statement_list = statement_list
38
39    def __repr__(self):
40        return "[ActionDecl: %r]" % (self.ident)
41
42    def generate(self):
43        resources = {}
44        if self.statement_list:
45            # Add new local vars
46            self.symtab.pushFrame()
47
48            addr_type = self.symtab.find("Address", Type)
49
50            if addr_type is None:
51                self.error("Type 'Address' not declared.")
52
53            var = Var(self.symtab, "address", self.location, addr_type,
54                      "addr", self.pairs)
55            self.symtab.newSymbol(var)
56
57            # Do not allows returns in actions
58            code = code_formatter()
59            self.statement_list.generate(code, None)
60            self.pairs["c_code"] = str(code)
61
62            self.statement_list.findResources(resources)
63
64            self.symtab.popFrame()
65
66        machine = self.symtab.state_machine
67        if machine is None:
68            self.error("Action declaration not part of a machine.")
69
70        action = Action(self.symtab, self.ident, resources, self.location,
71                        self.pairs)
72        machine.addAction(action)
73