InPortDeclAST.py revision 9820:2f9aecba2362 
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
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9# redistributions in binary form must reproduce the above copyright
10# notice, this list of conditions and the following disclaimer in the
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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
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27
28from slicc.ast.DeclAST import DeclAST
29from slicc.ast.TypeAST import TypeAST
30from slicc.symbols import Func, Type, Var
31
32class InPortDeclAST(DeclAST):
33    max_port_rank = 0
34
35    def __init__(self, slicc, ident, msg_type, var_expr, pairs, statements):
36        super(InPortDeclAST, self).__init__(slicc, pairs)
37
38        self.ident = ident
39        self.msg_type = msg_type
40        self.var_expr = var_expr
41        self.statements = statements
42        self.queue_type = TypeAST(slicc, "InPort")
43        if self.pairs.has_key("rank"):
44            InPortDeclAST.max_port_rank = max(self.pairs["rank"],
45                                              InPortDeclAST.max_port_rank)
46
47    def __repr__(self):
48        return "[InPortDecl: %s]" % self.ident
49
50    def generate(self):
51        symtab = self.symtab
52        void_type = symtab.find("void", Type)
53
54        machine = symtab.state_machine
55        if machine is None:
56            self.error("InPort declaration not part of a machine.")
57
58        code = self.slicc.codeFormatter()
59        queue_type = self.var_expr.generate(code)
60        if not queue_type.isInPort:
61            self.error("The inport queue's type must have the 'inport' " + \
62                       "attribute.  Type '%s' does not have this attribute.",
63                       queue_type)
64
65        type = self.queue_type.type
66        in_port = Var(self.symtab, self.ident, self.location, type, str(code),
67                      self.pairs)
68        symtab.newSymbol(in_port)
69
70        symtab.pushFrame()
71        param_types = []
72
73        # Check for Event
74        type = symtab.find("Event", Type)
75        if type is None:
76            self.error("in_port decls require 'Event' enumeration defined")
77        param_types.append(type)
78
79        # Check for Address
80        type = symtab.find("Address", Type)
81        if type is None:
82            self.error("in_port decls require 'Address' type to be defined")
83
84        param_types.append(type)
85
86        if machine.EntryType != None:
87            param_types.append(machine.EntryType)
88        if machine.TBEType != None:
89            param_types.append(machine.TBEType)
90
91        # Add the trigger method - FIXME, this is a bit dirty
92        pairs = { "external" : "yes" }
93        func = Func(self.symtab, "trigger", self.location, void_type,
94                    param_types, [], "", pairs)
95        symtab.newSymbol(func)
96
97        param_types = []
98        # Check for Event2
99        type = symtab.find("Event", Type)
100        if type is None:
101            self.error("in_port decls require 'Event' enumeration")
102
103        param_types.append(type)
104
105        # Check for Address2
106        type = symtab.find("Address", Type)
107        if type is None:
108            self.error("in_port decls require 'Address' type to be defined")
109
110        param_types.append(type)
111
112        if self.statements is not None:
113            rcode = self.slicc.codeFormatter()
114            rcode.indent()
115            rcode.indent()
116            self.statements.generate(rcode, None)
117            in_port["c_code_in_port"] = str(rcode)
118
119        symtab.popFrame()
120
121        # Add port to state machine
122        machine.addInPort(in_port)
123
124        # Include max_rank to be used by StateMachine.py
125        in_port["max_port_rank"] = InPortDeclAST.max_port_rank
126