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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) 1998-2004 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 "StringHeap.h"
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24 # include "svector.h"
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25 # include "verinum.h"
26
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27 class PExpr;
28
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29 /*
30 * This class represents a parsed UDP. This is a much simpler object
31 * then a module or macromodule.
32 *
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33 * - all ports are scalar,
91aad30 Parse UDP primitives all the way to pform.
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34 * - pin 0 (the first port) is always output,
35 * and the remaining pins are input.
36 *
37 * Thus, the ports can be represented as an ordered list of pin names.
38 * If the output port is declared as a register in the Verilog source,
39 * then this is a sequential UDP and the sequential flag is set to true.
40 *
41 * STATE TABLE
42 * Each entry in the state table is given as a string with the same
43 * number of characters as inputs. If the UDP is sequential, a
44 * character is also included at the end of the string to represent
45 * the current output.
46 *
47 * If the UDP is sequential, the "initial" member is taken to be the
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48 * initial value assigned in the source, or 'x' if none is given.
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49 */
50 class PUdp {
51
52 public:
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53 explicit PUdp(perm_string n, unsigned nports);
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54
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55 svector<string>ports;
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56 unsigned find_port(const char*name);
57
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58 bool sequential;
59
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60 svector<string>tinput;
61 svector<char> tcurrent;
62 svector<char> toutput;
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63
64 verinum::V initial;
65
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66 map<string,PExpr*> attributes;
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67
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68 void dump(ostream&out) const;
69
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70 perm_string name_;
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71 private:
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72
73 private: // Not implemented
74 PUdp(const PUdp&);
75 PUdp& operator= (const PUdp&);
76 };
77
78 #endif
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