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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2017 Robert Ou <rqou@robertou.com>
*
* 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 "kernel/yosys.h"
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
struct RecoverReducePass : public ScriptPass
{
RecoverReducePass() : ScriptPass("recover_reduce", "recovers $reduce_* from gates") {}
virtual void help() YS_OVERRIDE
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" recover_reduce [options]\n");
log("\n");
log("recovers $reduce_* from gates\n");
log("\n");
log("Reconstructs $reduce_* elements (e.g. larger gates) given a netlist of gates.");
log("This pass is intended to be used as part of a circuit reverse-engineering workflow.\n");
log("\n");
log("\n");
log("The following commands are executed by this command:\n");
help_script();
log("\n");
}
bool one_pass, no_final_abc;
virtual void clear_flags() YS_OVERRIDE
{
one_pass = false;
no_final_abc = false;
}
virtual void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
{
clear_flags();
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++)
{
if (args[argidx] == "-one_pass") {
one_pass = true;
continue;
}
if (args[argidx] == "-no_final_abc") {
no_final_abc = true;
continue;
}
break;
}
extra_args(args, argidx, design);
log_header(design, "Executing recover_reduce.\n");
log_push();
run_script(design, "", "");
log_pop();
}
virtual void script() YS_OVERRIDE
{
if (!one_pass)
{
// Certain structures such as counters seem to work better if we extract only AND
// and then run a general extract pass.
// XXX: Why is that? Does this work in general?
run("abc -g AND");
run("recover_reduce_core");
}
run("abc -g AND,OR,XOR");
run("recover_reduce_core");
if (!no_final_abc)
run("abc");
run("clean");
}
} RecoverReducePass;
PRIVATE_NAMESPACE_END
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