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https://github.com/steveicarus/iverilog.git
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Lars-Peter Clausen
85c58d0a7a
Drive strengths and delays are often handled as a pair of drive values and a rise/fall/decay triple. Add small helper types to carry these groups and use them in the continuous assignment and gate/UDP elaboration paths. Use the same helper types when propagating drive and delay values through netlist links. Also add helpers for dumping the values in debug output. This keeps the behavior consistent and fixes one small bug where some of the debug dumps printed the pointer value for the delays, rather than the actual delay values. Signed-off-by: Lars-Peter Clausen <[email protected]>
67 lines
1.9 KiB
C++
67 lines
1.9 KiB
C++
#ifndef IVL_PDelays_H
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#define IVL_PDelays_H
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/*
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* Copyright (c) 1999-2026 Stephen Williams ([email protected])
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*
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* This source code is free software; you can redistribute it
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* and/or modify it in source code form under the terms of the GNU
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* General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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# include <string>
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# include <list>
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# include <iostream>
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class Design;
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class NetScope;
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class NetExpr;
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class PExpr;
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struct delay_exprs_t;
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/*
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* Various PForm objects can carry delays. These delays include rise,
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* fall and decay times. This class arranges to carry the triplet.
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*/
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class PDelays {
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public:
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PDelays();
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~PDelays();
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/* Set the delay expressions. If the delete_flag is true, then
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this object takes ownership of the expressions, and will
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delete it in the destructor. */
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void set_delay(PExpr*);
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void set_delays(const std::list<PExpr*>*del, bool delete_flag=true);
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unsigned delay_count() const;
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void eval_delays(Design*des, NetScope*scope, delay_exprs_t &delays,
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bool as_nets_flag =false) const;
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void dump_delays(std::ostream&out) const;
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private:
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PExpr* delay_[3];
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bool delete_flag_;
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private: // not implemented
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PDelays(const PDelays&);
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PDelays& operator= (const PDelays&);
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};
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std::ostream& operator << (std::ostream&o, const PDelays&);
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#endif /* IVL_PDelays_H */
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