FuncDeclAST.py revision 6999:f226c098c393 
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
24# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28from slicc.ast.DeclAST import DeclAST
29from slicc.symbols import Func, Type
30
31class FuncDeclAST(DeclAST):
32    def __init__(self, slicc, return_type, ident, formals, pairs, statements):
33        super(FuncDeclAST, self).__init__(slicc, pairs)
34
35        self.return_type = return_type
36        self.ident = ident
37        self.formals = formals
38        self.statements = statements
39
40    def __repr__(self):
41        return "[FuncDecl: %s]" % self.ident
42
43    def files(self, parent=None):
44        if "external" in self or self.statements is None:
45            return set()
46
47        if parent:
48            ident = "%s_%s" % (parent, self.ident)
49        else:
50            ident = self.ident
51        return set(("%s.cc" % ident,))
52
53    def generate(self):
54        types = []
55        params = []
56        void_type = self.symtab.find("void", Type)
57
58        # Generate definition code
59        self.symtab.pushFrame()
60
61        # Lookup return type
62        return_type = self.return_type.type
63
64        # Generate function header
65        for formal in self.formals:
66            # Lookup parameter types
67            type, ident = formal.generate()
68            types.append(type)
69            params.append(ident)
70
71        body = self.slicc.codeFormatter()
72        if self.statements is None:
73            self["external"] = "yes"
74        else:
75            rtype = self.statements.generate(body, return_type)
76
77        self.symtab.popFrame()
78
79        machine = self.state_machine
80        func = Func(self.symtab, self.ident, self.location, return_type,
81                    types, params, str(body), self.pairs, machine)
82
83        if machine is not None:
84            machine.addFunc(func)
85        else:
86            self.symtab.newSymbol(func)
87