EnqueueStatementAST.py revision 10155:3b0bcc8c34ca 
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.StatementAST import StatementAST
29from slicc.symbols import Var
30
31class EnqueueStatementAST(StatementAST):
32    def __init__(self, slicc, queue_name, type_ast, lexpr, statements):
33        super(EnqueueStatementAST, self).__init__(slicc)
34
35        self.queue_name = queue_name
36        self.type_ast = type_ast
37        self.latexpr = lexpr
38        self.statements = statements
39
40    def __repr__(self):
41        return "[EnqueueStatementAst: %s %s %s]" % \
42               (self.queue_name, self.type_ast.ident, self.statements)
43
44    def generate(self, code, return_type):
45        code("{")
46        code.indent()
47        self.symtab.pushFrame()
48
49        msg_type = self.type_ast.type
50
51        # Add new local var to symbol table
52        v = Var(self.symtab, "out_msg", self.location, msg_type, "*out_msg",
53                self.pairs)
54        self.symtab.newSymbol(v)
55
56        # Declare message
57        code("${{msg_type.ident}} *out_msg = "\
58             "new ${{msg_type.ident}}(clockEdge());")
59
60        # The other statements
61        t = self.statements.generate(code, None)
62        self.queue_name.assertType("OutPort")
63
64        if self.latexpr != None:
65            ret_type, rcode = self.latexpr.inline(True)
66            code("(${{self.queue_name.var.code}}).enqueue(" \
67                 "out_msg, Cycles($rcode));")
68        else:
69            code("(${{self.queue_name.var.code}}).enqueue(out_msg);")
70
71        # End scope
72        self.symtab.popFrame()
73        code.dedent()
74        code("}")
75
76    def findResources(self, resources):
77        var = self.queue_name.var
78        res_count = int(resources.get(var, 0))
79        resources[var] = str(res_count + 1)
80