ActionDeclAST.py revision 11025 
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.DeclAST import DeclAST
29from slicc.symbols import Action, Type, Var
30
31class ActionDeclAST(DeclAST):
32    def __init__(self, slicc, ident, pairs, statement_list):
33        super(ActionDeclAST, self).__init__(slicc, pairs)
34        self.ident = ident
35        self.statement_list = statement_list
36
37    def __repr__(self):
38        return "[ActionDecl: %r]" % (self.ident)
39
40    def generate(self):
41        resources = {}
42
43        machine = self.symtab.state_machine
44        if machine is None:
45            self.error("Action declaration not part of a machine.")
46
47        if self.statement_list:
48            # Add new local vars
49            self.symtab.pushFrame()
50
51            addr_type = self.symtab.find("Addr", Type)
52
53            if addr_type is None:
54                self.error("Type 'Addr' not declared.")
55
56            var = Var(self.symtab, "address", self.location, addr_type,
57                      "addr", self.pairs)
58            self.symtab.newSymbol(var)
59
60            if machine.TBEType != None:
61                var = Var(self.symtab, "tbe", self.location, machine.TBEType,
62                      "m_tbe_ptr", self.pairs)
63                self.symtab.newSymbol(var)
64
65            if machine.EntryType != None:
66                var = Var(self.symtab, "cache_entry", self.location,
67                          machine.EntryType, "m_cache_entry_ptr", self.pairs)
68                self.symtab.newSymbol(var)
69
70            # Do not allows returns in actions
71            code = self.slicc.codeFormatter()
72            self.statement_list.generate(code, None)
73            self.pairs["c_code"] = str(code)
74
75            self.statement_list.findResources(resources)
76
77            self.symtab.popFrame()
78
79        action = Action(self.symtab, self.ident, resources, self.location,
80                        self.pairs)
81        machine.addAction(action)
82