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91aad30 Parse UDP primitives all the way to pform.
steve authored
1 #ifndef __PUdp_H
2 #define __PUdp_H
3 /*
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4 * Copyright (c) 1998-2011 Stephen Williams (steve@picturel.com)
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5 *
6 * This source code is free software; you can redistribute it
7 * and/or modify it in source code form under the terms of the GNU
8 * General Public License as published by the Free Software
9 * Foundation; either version 2 of the License, or (at your option)
10 * any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
20 */
21
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22 # include <map>
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23 # include "LineInfo.h"
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24 # include "StringHeap.h"
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25 # include "svector.h"
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26 # include "verinum.h"
27
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28 class PExpr;
29
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30 /*
31 * This class represents a parsed UDP. This is a much simpler object
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32 * than a module or macromodule.
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33 *
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34 * - all ports are scalar,
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35 * - pin 0 (the first port) is always output,
36 * and the remaining pins are input.
37 *
38 * Thus, the ports can be represented as an ordered list of pin names.
39 * If the output port is declared as a register in the Verilog source,
40 * then this is a sequential UDP and the sequential flag is set to true.
41 *
42 * STATE TABLE
43 * Each entry in the state table is given as a string with the same
44 * number of characters as inputs. If the UDP is sequential, a
45 * character is also included at the end of the string to represent
46 * the current output.
47 *
48 * If the UDP is sequential, the "initial" member is taken to be the
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49 * initial value assigned in the source, or 'x' if none is given.
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50 */
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51 class PUdp : public LineInfo {
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52
53 public:
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54 explicit PUdp(perm_string n, unsigned nports);
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55
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56 svector<string>ports;
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57 unsigned find_port(const char*name);
58
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59 bool sequential;
60
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61 svector<string>tinput;
62 svector<char> tcurrent;
63 svector<char> toutput;
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64
65 verinum::V initial;
66
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67 map<string,PExpr*> attributes;
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68
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69 void dump(ostream&out) const;
70
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71 perm_string name_;
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72 private:
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73
74 private: // Not implemented
75 PUdp(const PUdp&);
76 PUdp& operator= (const PUdp&);
77 };
78
79 #endif
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