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#ifndef IVL_PSpec_H
#define IVL_PSpec_H
/*
* Copyright (c) 2006-2014 Stephen Williams <steve@icarus.com>
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
* General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
# include "LineInfo.h"
# include "StringHeap.h"
# include <vector>
class PExpr;
/*
* The PSpecPath is the parse of a specify path, which is in its most
* general form <path> = <delays>. The <delays> are collected into the
* "delays" vector in all cases, and the variety is in the other
* members.
*
* All paths also have a list of source names in the src vector, and a
* list of destination names in the dst vector. These pairs are the
* actual paths.
*
* If the path is a simple path, then:
* condition == nil
* edge == 0
* data_source_expression == nil
*
* If the path is conditional, then conditional == true and condition
* is the condition expression. If the condition expression is nil,
* then this is an ifnone conditional path.
*
* If data_source_expression != nil, then the path is edge sensitive
* and the edge might not be 0.
*
* The full flag is used to verify that only vectors of the same size
* are used in a parallel connection. Icarus always creates a full
* connection between the source and destination. The polarity is for
* informational (display) purposes only. The polarity is either '+',
* '-' or 0.
*/
class PSpecPath : public LineInfo {
public:
PSpecPath(unsigned src_cnt, unsigned dst_cnt, char polarity,
bool full_flag);
~PSpecPath();
void elaborate(class Design*des, class NetScope*scope) const;
void dump(std::ostream&out, unsigned ind) const;
public:
// Condition expression, if present.
bool conditional;
class PExpr* condition;
// Edge specification (-1==negedge, 0 = no edge, 1==posedge)
int edge;
// Is this a full connection.
bool full_flag_;
// What is the polarity of the connection.
char polarity_;
// Ordered set of source nodes of a path
std::vector<perm_string> src;
// Ordered set of destination nodes of a path
std::vector<perm_string> dst;
// Data source expression
class PExpr* data_source_expression;
std::vector<class PExpr*>delays;
};
#endif /* IVL_PSpec_H */
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