SDC: Add set_max_delay command

Signed-off-by: Tomasz Michalak <tmichalak@antmicro.com>

sdc-plugin/set_max_delay.cc

diff --git a/sdc-plugin/set_max_delay.cc b/sdc-plugin/set_max_delay.cc
new file mode 100644
index 0000000..055e342
--- /dev/null
+++ b/sdc-plugin/set_max_delay.cc
@@ -0,0 +1,92 @@
+/*
+ *  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 "set_max_delay.h"
+#include "kernel/log.h"
+#include "sdc_writer.h"
+
+USING_YOSYS_NAMESPACE
+
+void SetMaxDelay::help() {
+    //   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
+    log("\n");
+    log("   set_max_delay [-quiet] [-from <arg>] [-to <arg>] \n");
+    log("\n");
+    log("Specify maximum delay for timing paths\n");
+    log("\n");
+    log("Print the output to stdout too. This is useful when all Yosys is "
+        "executed.\n");
+    log("\n");
+    log("    -quiet\n");
+    log("        Don't print the result of the execution to stdout.\n");
+    log("\n");
+    log("    -from\n");
+    log("        List of start points or clocks.\n");
+    log("\n");
+    log("    -to\n");
+    log("        List of end points or clocks.\n");
+    log("\n");
+}
+
+void SetMaxDelay::execute(std::vector<std::string> args,
+                          RTLIL::Design* design) {
+    RTLIL::Module* top_module = design->top_module();
+    if (top_module == nullptr) {
+	log_cmd_error("No top module detected\n");
+    }
+
+    size_t argidx;
+    bool is_quiet = false;
+    std::string from_pin;
+    std::string to_pin;
+    float max_delay(0.0);
+
+    // Parse command arguments
+    for (argidx = 1; argidx < args.size(); argidx++) {
+	std::string arg = args[argidx];
+	if (arg == "-quiet") {
+	    is_quiet = true;
+	    continue;
+	}
+
+	if (arg == "-from" and argidx + 1 < args.size()) {
+	    from_pin = args[++argidx];
+	    log("From: %s\n", from_pin.c_str());
+	    continue;
+	}
+
+	if (arg == "-to" and argidx + 1 < args.size()) {
+	    to_pin = args[++argidx];
+	    log("To: %s\n", to_pin.c_str());
+	    continue;
+	}
+
+	if (arg.size() > 0 and arg[0] == '-') {
+	    log_cmd_error("Unknown option %s.\n", arg.c_str());
+	}
+
+	max_delay = std::stof(args[argidx]);
+    }
+
+    if (!is_quiet) {
+	std::string msg = (from_pin.empty()) ? "" : "-from " + from_pin;
+	msg += (to_pin.empty()) ? "" : " -to " + to_pin;
+	log("Adding max path delay of %f on path %s\n", max_delay, msg.c_str());
+    }
+    sdc_writer_.SetMaxDelay(TimingPath{
+        .from_pin = from_pin, .to_pin = to_pin, .max_delay = max_delay});
+}

sdc-plugin/set_max_delay.h

diff --git a/sdc-plugin/set_max_delay.h b/sdc-plugin/set_max_delay.h
new file mode 100644
index 0000000..7272839
--- /dev/null
+++ b/sdc-plugin/set_max_delay.h
@@ -0,0 +1,39 @@
+/*
+ *  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.
+ */
+#ifndef _SET_MAX_DELAY_H_
+#define _SET_MAX_DELAY_H_
+
+#include "kernel/register.h"
+#include "kernel/rtlil.h"
+#include "sdc_writer.h"
+
+USING_YOSYS_NAMESPACE
+
+struct SetMaxDelay : public Pass {
+    SetMaxDelay(SdcWriter& sdc_writer)
+        : Pass("set_max_delay", "Specify maximum delay for timing paths"),
+          sdc_writer_(sdc_writer) {}
+
+    void help() override;
+
+    void execute(std::vector<std::string> args, RTLIL::Design* design) override;
+
+    SdcWriter& sdc_writer_;
+};
+
+#endif  //_SET_MAX_DELAY_H_