EnqueueStatementAST.py revision 6657:ef5fae93a3b2 
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.StatementAST import StatementAST
29from slicc.symbols import Var
30
31class EnqueueStatementAST(StatementAST):
32    def __init__(self, slicc, queue_name, type_ast, pairs, statements):
33        super(EnqueueStatementAST, self).__init__(slicc, pairs)
34
35        self.queue_name = queue_name
36        self.type_ast = type_ast
37        self.statements = statements
38
39    def __repr__(self):
40        return "[EnqueueStatementAst: %s %s %s]" % \
41               (self.queue_name, self.type_ast.ident, self.statements)
42
43    def generate(self, code, return_type):
44        code("{")
45        code.indent()
46        self.symtab.pushFrame()
47
48        msg_type = self.type_ast.type
49
50        # Add new local var to symbol table
51        v = Var(self.symtab, "out_msg", self.location, msg_type, "out_msg",
52                self.pairs)
53        self.symtab.newSymbol(v)
54
55        # Declare message
56        code("${{msg_type.ident}} out_msg;")
57
58        # The other statements
59        t = self.statements.generate(code, None)
60
61        self.queue_name.assertType("OutPort")
62
63        args = [ "out_msg" ]
64        if "latency" in self:
65            latency = self["latency"]
66            try:
67                # see if this is an integer
68                latency = int(latency)
69                args.append("%s" % latency)
70            except ValueError:
71                # if not, it should be a member
72                args.append("m_%s" % latency)
73
74        args = ", ".join(args)
75        code('(${{self.queue_name.var.code}}).enqueue($args);')
76
77
78        # End scope
79        self.symtab.popFrame()
80        code.dedent()
81        code("}")
82
83    def findResources(self, resources):
84        var = self.queue_name.var
85        res_count = int(resources.get(var, 0))
86        resources[var] = str(res_count + 1)
87