sdc-plugin/sdc_writer.cc

/*
 *  yosys -- Yosys Open SYnthesis Suite
 *
 *  Copyright (C) 2020  The Symbiflow Authors
 *
 *  Permission to use, copy, modify, and/or distribute this software for any
 *  purpose with or without fee is hereby granted, provided that the above
 *  copyright notice and this permission notice appear in all copies.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include "sdc_writer.h"

USING_YOSYS_NAMESPACE

void SdcWriter::AddFalsePath(FalsePath false_path) {
    false_paths_.push_back(false_path);
}

void SdcWriter::WriteSdc(Clocks& clocks, std::ostream& file) {
    WriteClocks(clocks, file);
    WriteFalsePaths(file);
}

void SdcWriter::WriteClocks(Clocks& clocks, std::ostream& file) {
    for (auto clock : clocks.GetClocks()) {
	auto clock_wires = clock.GetClockWires();
	// FIXME: Input port nets are not found in VPR
	if (std::all_of(clock_wires.begin(), clock_wires.end(),
	                [&](RTLIL::Wire* wire) { return wire->port_input; })) {
	    continue;
	}
	file << "create_clock -period " << clock.Period();
	file << " -waveform {" << clock.RisingEdge() << " "
	     << clock.FallingEdge() << "}";
	for (auto clock_wire : clock_wires) {
	    if (clock_wire->port_input) {
		continue;
	    }
	    file << " " << Clock::ClockWireName(clock_wire);
	}
	file << std::endl;
    }
}

void SdcWriter::WriteFalsePaths(std::ostream& file) {
    for (auto path : false_paths_) {
	file << "set_false_path";
	if (!path.from_pin.empty()) {
	    file << " -from " << path.from_pin;
	}
	if (!path.to_pin.empty()) {
	    file << " -to " << path.to_pin;
	}
	file << std::endl;
    }
}