Disabled RTLIL::SigSpec::check() in release builds

[yosys.git] / kernel / rtlil.cc

/*
 *  yosys -- Yosys Open SYnthesis Suite
 *
 *  Copyright (C) 2012  Clifford Wolf <clifford@clifford.at>
 *  
 *  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/compatibility.h"
#include "kernel/rtlil.h"
#include "kernel/log.h"
#include "frontends/verilog/verilog_frontend.h"
#include "backends/ilang/ilang_backend.h"

#include <assert.h>
#include <string.h>
#include <algorithm>

int RTLIL::autoidx = 1;

RTLIL::Const::Const()
{
        flags = RTLIL::CONST_FLAG_NONE;
}

RTLIL::Const::Const(std::string str)
{
        flags = RTLIL::CONST_FLAG_STRING;
        for (int i = str.size()-1; i >= 0; i--) {
                unsigned char ch = str[i];
                for (int j = 0; j < 8; j++) {
                        bits.push_back((ch & 1) != 0 ? RTLIL::S1 : RTLIL::S0);
                        ch = ch >> 1;
                }
        }
}

RTLIL::Const::Const(int val, int width)
{
        flags = RTLIL::CONST_FLAG_NONE;
        for (int i = 0; i < width; i++) {
                bits.push_back((val & 1) != 0 ? RTLIL::S1 : RTLIL::S0);
                val = val >> 1;
        }
}

RTLIL::Const::Const(RTLIL::State bit, int width)
{
        flags = RTLIL::CONST_FLAG_NONE;
        for (int i = 0; i < width; i++)
                bits.push_back(bit);
}

bool RTLIL::Const::operator <(const RTLIL::Const &other) const
{
        if (bits.size() != other.bits.size())
                return bits.size() < other.bits.size();
        for (size_t i = 0; i < bits.size(); i++)
                if (bits[i] != other.bits[i])
                        return bits[i] < other.bits[i];
        return false;
}

bool RTLIL::Const::operator ==(const RTLIL::Const &other) const
{
        return bits == other.bits;
}

bool RTLIL::Const::operator !=(const RTLIL::Const &other) const
{
        return bits != other.bits;
}

bool RTLIL::Const::as_bool() const
{
        for (size_t i = 0; i < bits.size(); i++)
                if (bits[i] == RTLIL::S1)
                        return true;
        return false;
}

int RTLIL::Const::as_int() const
{
        int ret = 0;
        for (size_t i = 0; i < bits.size() && i < 32; i++)
                if (bits[i] == RTLIL::S1)
                        ret |= 1 << i;
        return ret;
}

std::string RTLIL::Const::as_string() const
{
        std::string ret;
        for (size_t i = bits.size(); i > 0; i--)
                switch (bits[i-1]) {
                        case S0: ret += "0"; break;
                        case S1: ret += "1"; break;
                        case Sx: ret += "x"; break;
                        case Sz: ret += "z"; break;
                        case Sa: ret += "-"; break;
                        case Sm: ret += "m"; break;
                }
        return ret;
}

std::string RTLIL::Const::decode_string() const
{
        std::string string;
        std::vector <char> string_chars;
        for (int i = 0; i < int (bits.size()); i += 8) {
                char ch = 0;
                for (int j = 0; j < 8 && i + j < int (bits.size()); j++)
                        if (bits[i + j] == RTLIL::State::S1)
                                ch |= 1 << j;
                if (ch != 0)
                        string_chars.push_back(ch);
        }
        for (int i = int (string_chars.size()) - 1; i >= 0; i--)
                string += string_chars[i];
        return string;
}

bool RTLIL::Selection::selected_module(RTLIL::IdString mod_name) const
{
        if (full_selection)
                return true;
        if (selected_modules.count(mod_name) > 0)
                return true;
        if (selected_members.count(mod_name) > 0)
                return true;
        return false;
}

bool RTLIL::Selection::selected_whole_module(RTLIL::IdString mod_name) const
{
        if (full_selection)
                return true;
        if (selected_modules.count(mod_name) > 0)
                return true;
        return false;
}

bool RTLIL::Selection::selected_member(RTLIL::IdString mod_name, RTLIL::IdString memb_name) const
{
        if (full_selection)
                return true;
        if (selected_modules.count(mod_name) > 0)
                return true;
        if (selected_members.count(mod_name) > 0)
                if (selected_members.at(mod_name).count(memb_name) > 0)
                        return true;
        return false;
}

void RTLIL::Selection::optimize(RTLIL::Design *design)
{
        if (full_selection) {
                selected_modules.clear();
                selected_members.clear();
                return;
        }

        std::vector<RTLIL::IdString> del_list, add_list;

        del_list.clear();
        for (auto mod_name : selected_modules) {
                if (design->modules.count(mod_name) == 0)
                        del_list.push_back(mod_name);
                selected_members.erase(mod_name);
        }
        for (auto mod_name : del_list)
                selected_modules.erase(mod_name);

        del_list.clear();
        for (auto &it : selected_members)
                if (design->modules.count(it.first) == 0)
                        del_list.push_back(it.first);
        for (auto mod_name : del_list)
                selected_members.erase(mod_name);

        for (auto &it : selected_members) {
                del_list.clear();
                for (auto memb_name : it.second)
                        if (design->modules[it.first]->count_id(memb_name) == 0)
                                del_list.push_back(memb_name);
                for (auto memb_name : del_list)
                        it.second.erase(memb_name);
        }

        del_list.clear();
        add_list.clear();
        for (auto &it : selected_members)
                if (it.second.size() == 0)
                        del_list.push_back(it.first);
                else if (it.second.size() == design->modules[it.first]->wires.size() + design->modules[it.first]->memories.size() +
                                design->modules[it.first]->cells.size() + design->modules[it.first]->processes.size())
                        add_list.push_back(it.first);
        for (auto mod_name : del_list)
                selected_members.erase(mod_name);
        for (auto mod_name : add_list) {
                selected_members.erase(mod_name);
                selected_modules.insert(mod_name);
        }

        if (selected_modules.size() == design->modules.size()) {
                full_selection = true;
                selected_modules.clear();
                selected_members.clear();
        }
}

RTLIL::Design::~Design()
{
        for (auto it = modules.begin(); it != modules.end(); it++)
                delete it->second;
}

void RTLIL::Design::check()
{
#ifndef NDEBUG
        for (auto &it : modules) {
                assert(it.first == it.second->name);
                assert(it.first.size() > 0 && (it.first[0] == '\\' || it.first[0] == '$'));
                it.second->check();
        }
#endif
}

void RTLIL::Design::optimize()
{
        for (auto &it : modules)
                it.second->optimize();
        for (auto &it : selection_stack)
                it.optimize(this);
        for (auto &it : selection_vars)
                it.second.optimize(this);
}

bool RTLIL::Design::selected_module(RTLIL::IdString mod_name) const
{
        if (!selected_active_module.empty() && mod_name != selected_active_module)
                return false;
        if (selection_stack.size() == 0)
                return true;
        return selection_stack.back().selected_module(mod_name);
}

bool RTLIL::Design::selected_whole_module(RTLIL::IdString mod_name) const
{
        if (!selected_active_module.empty() && mod_name != selected_active_module)
                return false;
        if (selection_stack.size() == 0)
                return true;
        return selection_stack.back().selected_whole_module(mod_name);
}

bool RTLIL::Design::selected_member(RTLIL::IdString mod_name, RTLIL::IdString memb_name) const
{
        if (!selected_active_module.empty() && mod_name != selected_active_module)
                return false;
        if (selection_stack.size() == 0)
                return true;
        return selection_stack.back().selected_member(mod_name, memb_name);
}

RTLIL::Module::~Module()
{
        for (auto it = wires.begin(); it != wires.end(); it++)
                delete it->second;
        for (auto it = memories.begin(); it != memories.end(); it++)
                delete it->second;
        for (auto it = cells.begin(); it != cells.end(); it++)
                delete it->second;
        for (auto it = processes.begin(); it != processes.end(); it++)
                delete it->second;
}

RTLIL::IdString RTLIL::Module::derive(RTLIL::Design*, std::map<RTLIL::IdString, RTLIL::Const>)
{
        log_error("Module `%s' is used with parameters but is not parametric!\n", id2cstr(name));
}

size_t RTLIL::Module::count_id(RTLIL::IdString id)
{
        return wires.count(id) + memories.count(id) + cells.count(id) + processes.count(id);
}

#ifndef NDEBUG
namespace {
        struct InternalCellChecker
        {
                RTLIL::Module *module;
                RTLIL::Cell *cell;
                std::set<RTLIL::IdString> expected_params, expected_ports;

                InternalCellChecker(RTLIL::Module *module, RTLIL::Cell *cell) : module(module), cell(cell) { }

                void error(int linenr)
                {
                        char *ptr;
                        size_t size;

                        FILE *f = open_memstream(&ptr, &size);
                        ILANG_BACKEND::dump_cell(f, "  ", cell);
                        fputc(0, f);
                        fclose(f);

                        log_error("Found error in internal cell %s%s%s (%s) at %s:%d:\n%s",
                                        module ? module->name.c_str() : "", module ? "." : "",
                                        cell->name.c_str(), cell->type.c_str(), __FILE__, linenr, ptr);
                }

                int param(const char *name)
                {
                        if (cell->parameters.count(name) == 0)
                                error(__LINE__);
                        expected_params.insert(name);
                        return cell->parameters.at(name).as_int();
                }

                int param_bool(const char *name)
                {
                        int v = param(name);
                        if (cell->parameters.at(name).bits.size() > 32)
                                error(__LINE__);
                        if (v != 0 && v != 1)
                                error(__LINE__);
                        return v;
                }

                void param_bits(const char *name, int width)
                {
                        param(name);
                        if (int(cell->parameters.at(name).bits.size()) != width)
                                error(__LINE__);
                }

                void port(const char *name, int width)
                {
                        if (cell->connections.count(name) == 0)
                                error(__LINE__);
                        if (cell->connections.at(name).size() != width)
                                error(__LINE__);
                        expected_ports.insert(name);
                }

                void check_expected(bool check_matched_sign = true)
                {
                        for (auto &para : cell->parameters)
                                if (expected_params.count(para.first) == 0)
                                        error(__LINE__);
                        for (auto &conn : cell->connections)
                                if (expected_ports.count(conn.first) == 0)
                                        error(__LINE__);

                        if (expected_params.count("\\A_SIGNED") != 0 && expected_params.count("\\B_SIGNED") && check_matched_sign) {
                                bool a_is_signed = param("\\A_SIGNED") != 0;
                                bool b_is_signed = param("\\B_SIGNED") != 0;
                                if (a_is_signed != b_is_signed)
                                        error(__LINE__);
                        }
                }

                void check_gate(const char *ports)
                {
                        if (cell->parameters.size() != 0)
                                error(__LINE__);

                        for (const char *p = ports; *p; p++) {
                                char portname[3] = { '\\', *p, 0 };
                                if (cell->connections.count(portname) == 0)
                                        error(__LINE__);
                                if (cell->connections.at(portname).size() != 1)
                                        error(__LINE__);
                        }

                        for (auto &conn : cell->connections) {
                                if (conn.first.size() != 2 || conn.first.at(0) != '\\')
                                        error(__LINE__);
                                if (strchr(ports, conn.first.at(1)) == NULL)
                                        error(__LINE__);
                        }
                }

                void check()
                {
                        if (cell->type[0] != '$' || cell->type.substr(0, 3) == "$__" || cell->type.substr(0, 8) == "$paramod" ||
                                        cell->type.substr(0, 9) == "$verific$" || cell->type.substr(0, 7) == "$array:")
                                return;

                        if (cell->type == "$not" || cell->type == "$pos" || cell->type == "$bu0" || cell->type == "$neg") {
                                param_bool("\\A_SIGNED");
                                port("\\A", param("\\A_WIDTH"));
                                port("\\Y", param("\\Y_WIDTH"));
                                check_expected();
                                return;
                        }

                        if (cell->type == "$and" || cell->type == "$or" || cell->type == "$xor" || cell->type == "$xnor") {
                                param_bool("\\A_SIGNED");
                                param_bool("\\B_SIGNED");
                                port("\\A", param("\\A_WIDTH"));
                                port("\\B", param("\\B_WIDTH"));
                                port("\\Y", param("\\Y_WIDTH"));
                                check_expected();
                                return;
                        }

                        if (cell->type == "$reduce_and" || cell->type == "$reduce_or" || cell->type == "$reduce_xor" ||
                                        cell->type == "$reduce_xnor" || cell->type == "$reduce_bool") {
                                param_bool("\\A_SIGNED");
                                port("\\A", param("\\A_WIDTH"));
                                port("\\Y", param("\\Y_WIDTH"));
                                check_expected();
                                return;
                        }

                        if (cell->type == "$shl" || cell->type == "$shr" || cell->type == "$sshl" || cell->type == "$sshr") {
                                param_bool("\\A_SIGNED");
                                param_bool("\\B_SIGNED");
                                port("\\A", param("\\A_WIDTH"));
                                port("\\B", param("\\B_WIDTH"));
                                port("\\Y", param("\\Y_WIDTH"));
                                check_expected(false);
                                return;
                        }

                        if (cell->type == "$lt" || cell->type == "$le" || cell->type == "$eq" || cell->type == "$ne" ||
                                        cell->type == "$eqx" || cell->type == "$nex" || cell->type == "$ge" || cell->type == "$gt") {
                                param_bool("\\A_SIGNED");
                                param_bool("\\B_SIGNED");
                                port("\\A", param("\\A_WIDTH"));
                                port("\\B", param("\\B_WIDTH"));
                                port("\\Y", param("\\Y_WIDTH"));
                                check_expected();
                                return;
                        }

                        if (cell->type == "$add" || cell->type == "$sub" || cell->type == "$mul" || cell->type == "$div" ||
                                        cell->type == "$mod" || cell->type == "$pow") {
                                param_bool("\\A_SIGNED");
                                param_bool("\\B_SIGNED");
                                port("\\A", param("\\A_WIDTH"));
                                port("\\B", param("\\B_WIDTH"));
                                port("\\Y", param("\\Y_WIDTH"));
                                check_expected(cell->type != "$pow");
                                return;
                        }

                        if (cell->type == "$logic_not") {
                                param_bool("\\A_SIGNED");
                                port("\\A", param("\\A_WIDTH"));
                                port("\\Y", param("\\Y_WIDTH"));
                                check_expected();
                                return;
                        }

                        if (cell->type == "$logic_and" || cell->type == "$logic_or") {
                                param_bool("\\A_SIGNED");
                                param_bool("\\B_SIGNED");
                                port("\\A", param("\\A_WIDTH"));
                                port("\\B", param("\\B_WIDTH"));
                                port("\\Y", param("\\Y_WIDTH"));
                                check_expected(false);
                                return;
                        }

                        if (cell->type == "$slice") {
                                param("\\OFFSET");
                                port("\\A", param("\\A_WIDTH"));
                                port("\\Y", param("\\Y_WIDTH"));
                                if (param("\\OFFSET") + param("\\Y_WIDTH") > param("\\A_WIDTH"))
                                        error(__LINE__);
                                check_expected();
                                return;
                        }

                        if (cell->type == "$concat") {
                                port("\\A", param("\\A_WIDTH"));
                                port("\\B", param("\\B_WIDTH"));
                                port("\\Y", param("\\A_WIDTH") + param("\\B_WIDTH"));
                                check_expected();
                                return;
                        }

                        if (cell->type == "$mux") {
                                port("\\A", param("\\WIDTH"));
                                port("\\B", param("\\WIDTH"));
                                port("\\S", 1);
                                port("\\Y", param("\\WIDTH"));
                                check_expected();
                                return;
                        }

                        if (cell->type == "$pmux" || cell->type == "$safe_pmux") {
                                port("\\A", param("\\WIDTH"));
                                port("\\B", param("\\WIDTH") * param("\\S_WIDTH"));
                                port("\\S", param("\\S_WIDTH"));
                                port("\\Y", param("\\WIDTH"));
                                check_expected();
                                return;
                        }

                        if (cell->type == "$lut") {
                                param("\\LUT");
                                port("\\I", param("\\WIDTH"));
                                port("\\O", 1);
                                check_expected();
                                return;
                        }

                        if (cell->type == "$sr") {
                                param_bool("\\SET_POLARITY");
                                param_bool("\\CLR_POLARITY");
                                port("\\SET", param("\\WIDTH"));
                                port("\\CLR", param("\\WIDTH"));
                                port("\\Q",   param("\\WIDTH"));
                                check_expected();
                                return;
                        }

                        if (cell->type == "$dff") {
                                param_bool("\\CLK_POLARITY");
                                port("\\CLK", 1);
                                port("\\D", param("\\WIDTH"));
                                port("\\Q", param("\\WIDTH"));
                                check_expected();
                                return;
                        }

                        if (cell->type == "$dffsr") {
                                param_bool("\\CLK_POLARITY");
                                param_bool("\\SET_POLARITY");
                                param_bool("\\CLR_POLARITY");
                                port("\\CLK", 1);
                                port("\\SET", param("\\WIDTH"));
                                port("\\CLR", param("\\WIDTH"));
                                port("\\D", param("\\WIDTH"));
                                port("\\Q", param("\\WIDTH"));
                                check_expected();
                                return;
                        }

                        if (cell->type == "$adff") {
                                param_bool("\\CLK_POLARITY");
                                param_bool("\\ARST_POLARITY");
                                param_bits("\\ARST_VALUE", param("\\WIDTH"));
                                port("\\CLK", 1);
                                port("\\ARST", 1);
                                port("\\D", param("\\WIDTH"));
                                port("\\Q", param("\\WIDTH"));
                                check_expected();
                                return;
                        }

                        if (cell->type == "$dlatch") {
                                param_bool("\\EN_POLARITY");
                                port("\\EN", 1);
                                port("\\D", param("\\WIDTH"));
                                port("\\Q", param("\\WIDTH"));
                                check_expected();
                                return;
                        }

                        if (cell->type == "$dlatchsr") {
                                param_bool("\\EN_POLARITY");
                                param_bool("\\SET_POLARITY");
                                param_bool("\\CLR_POLARITY");
                                port("\\EN", 1);
                                port("\\SET", param("\\WIDTH"));
                                port("\\CLR", param("\\WIDTH"));
                                port("\\D", param("\\WIDTH"));
                                port("\\Q", param("\\WIDTH"));
                                check_expected();
                                return;
                        }

                        if (cell->type == "$fsm") {
                                param("\\NAME");
                                param_bool("\\CLK_POLARITY");
                                param_bool("\\ARST_POLARITY");
                                param("\\STATE_BITS");
                                param("\\STATE_NUM");
                                param("\\STATE_NUM_LOG2");
                                param("\\STATE_RST");
                                param_bits("\\STATE_TABLE", param("\\STATE_BITS") * param("\\STATE_NUM"));
                                param("\\TRANS_NUM");
                                param_bits("\\TRANS_TABLE", param("\\TRANS_NUM") * (2*param("\\STATE_NUM_LOG2") + param("\\CTRL_IN_WIDTH") + param("\\CTRL_OUT_WIDTH")));
                                port("\\CLK", 1);
                                port("\\ARST", 1);
                                port("\\CTRL_IN", param("\\CTRL_IN_WIDTH"));
                                port("\\CTRL_OUT", param("\\CTRL_OUT_WIDTH"));
                                check_expected();
                                return;
                        }

                        if (cell->type == "$memrd") {
                                param("\\MEMID");
                                param_bool("\\CLK_ENABLE");
                                param_bool("\\CLK_POLARITY");
                                param_bool("\\TRANSPARENT");
                                port("\\CLK", 1);
                                port("\\ADDR", param("\\ABITS"));
                                port("\\DATA", param("\\WIDTH"));
                                check_expected();
                                return;
                        }

                        if (cell->type == "$memwr") {
                                param("\\MEMID");
                                param_bool("\\CLK_ENABLE");
                                param_bool("\\CLK_POLARITY");
                                param("\\PRIORITY");
                                port("\\CLK", 1);
                                port("\\EN", param("\\WIDTH"));
                                port("\\ADDR", param("\\ABITS"));
                                port("\\DATA", param("\\WIDTH"));
                                check_expected();
                                return;
                        }

                        if (cell->type == "$mem") {
                                param("\\MEMID");
                                param("\\SIZE");
                                param("\\OFFSET");
                                param_bits("\\RD_CLK_ENABLE", param("\\RD_PORTS"));
                                param_bits("\\RD_CLK_POLARITY", param("\\RD_PORTS"));
                                param_bits("\\RD_TRANSPARENT", param("\\RD_PORTS"));
                                param_bits("\\WR_CLK_ENABLE", param("\\WR_PORTS"));
                                param_bits("\\WR_CLK_POLARITY", param("\\WR_PORTS"));
                                port("\\RD_CLK", param("\\RD_PORTS"));
                                port("\\RD_ADDR", param("\\RD_PORTS") * param("\\ABITS"));
                                port("\\RD_DATA", param("\\RD_PORTS") * param("\\WIDTH"));
                                port("\\WR_CLK", param("\\WR_PORTS"));
                                port("\\WR_EN", param("\\WR_PORTS") * param("\\WIDTH"));
                                port("\\WR_ADDR", param("\\WR_PORTS") * param("\\ABITS"));
                                port("\\WR_DATA", param("\\WR_PORTS") * param("\\WIDTH"));
                                check_expected();
                                return;
                        }

                        if (cell->type == "$assert") {
                                port("\\A", 1);
                                port("\\EN", 1);
                                check_expected();
                                return;
                        }

                        if (cell->type == "$_INV_") { check_gate("AY"); return; }
                        if (cell->type == "$_AND_") { check_gate("ABY"); return; }
                        if (cell->type == "$_OR_")  { check_gate("ABY"); return; }
                        if (cell->type == "$_XOR_") { check_gate("ABY"); return; }
                        if (cell->type == "$_MUX_") { check_gate("ABSY"); return; }

                        if (cell->type == "$_SR_NN_") { check_gate("SRQ"); return; }
                        if (cell->type == "$_SR_NP_") { check_gate("SRQ"); return; }
                        if (cell->type == "$_SR_PN_") { check_gate("SRQ"); return; }
                        if (cell->type == "$_SR_PP_") { check_gate("SRQ"); return; }

                        if (cell->type == "$_DFF_N_") { check_gate("DQC"); return; }
                        if (cell->type == "$_DFF_P_") { check_gate("DQC"); return; }

                        if (cell->type == "$_DFF_NN0_") { check_gate("DQCR"); return; }
                        if (cell->type == "$_DFF_NN1_") { check_gate("DQCR"); return; }
                        if (cell->type == "$_DFF_NP0_") { check_gate("DQCR"); return; }
                        if (cell->type == "$_DFF_NP1_") { check_gate("DQCR"); return; }
                        if (cell->type == "$_DFF_PN0_") { check_gate("DQCR"); return; }
                        if (cell->type == "$_DFF_PN1_") { check_gate("DQCR"); return; }
                        if (cell->type == "$_DFF_PP0_") { check_gate("DQCR"); return; }
                        if (cell->type == "$_DFF_PP1_") { check_gate("DQCR"); return; }

                        if (cell->type == "$_DFFSR_NNN_") { check_gate("CSRDQ"); return; }
                        if (cell->type == "$_DFFSR_NNP_") { check_gate("CSRDQ"); return; }
                        if (cell->type == "$_DFFSR_NPN_") { check_gate("CSRDQ"); return; }
                        if (cell->type == "$_DFFSR_NPP_") { check_gate("CSRDQ"); return; }
                        if (cell->type == "$_DFFSR_PNN_") { check_gate("CSRDQ"); return; }
                        if (cell->type == "$_DFFSR_PNP_") { check_gate("CSRDQ"); return; }
                        if (cell->type == "$_DFFSR_PPN_") { check_gate("CSRDQ"); return; }
                        if (cell->type == "$_DFFSR_PPP_") { check_gate("CSRDQ"); return; }

                        if (cell->type == "$_DLATCH_N_") { check_gate("EDQ"); return; }
                        if (cell->type == "$_DLATCH_P_") { check_gate("EDQ"); return; }

                        if (cell->type == "$_DLATCHSR_NNN_") { check_gate("ESRDQ"); return; }
                        if (cell->type == "$_DLATCHSR_NNP_") { check_gate("ESRDQ"); return; }
                        if (cell->type == "$_DLATCHSR_NPN_") { check_gate("ESRDQ"); return; }
                        if (cell->type == "$_DLATCHSR_NPP_") { check_gate("ESRDQ"); return; }
                        if (cell->type == "$_DLATCHSR_PNN_") { check_gate("ESRDQ"); return; }
                        if (cell->type == "$_DLATCHSR_PNP_") { check_gate("ESRDQ"); return; }
                        if (cell->type == "$_DLATCHSR_PPN_") { check_gate("ESRDQ"); return; }
                        if (cell->type == "$_DLATCHSR_PPP_") { check_gate("ESRDQ"); return; }

                        error(__LINE__);
                }
        };
}
#endif

void RTLIL::Module::check()
{
#ifndef NDEBUG
        for (auto &it : wires) {
                assert(it.first == it.second->name);
                assert(it.first.size() > 0 && (it.first[0] == '\\' || it.first[0] == '$'));
                assert(it.second->width >= 0);
                assert(it.second->port_id >= 0);
                for (auto &it2 : it.second->attributes) {
                        assert(it2.first.size() > 0 && (it2.first[0] == '\\' || it2.first[0] == '$'));
                }
        }

        for (auto &it : memories) {
                assert(it.first == it.second->name);
                assert(it.first.size() > 0 && (it.first[0] == '\\' || it.first[0] == '$'));
                assert(it.second->width >= 0);
                assert(it.second->size >= 0);
                for (auto &it2 : it.second->attributes) {
                        assert(it2.first.size() > 0 && (it2.first[0] == '\\' || it2.first[0] == '$'));
                }
        }

        for (auto &it : cells) {
                assert(it.first == it.second->name);
                assert(it.first.size() > 0 && (it.first[0] == '\\' || it.first[0] == '$'));
                assert(it.second->type.size() > 0 && (it.second->type[0] == '\\' || it.second->type[0] == '$'));
                for (auto &it2 : it.second->connections) {
                        assert(it2.first.size() > 0 && (it2.first[0] == '\\' || it2.first[0] == '$'));
                        it2.second.check();
                }
                for (auto &it2 : it.second->attributes) {
                        assert(it2.first.size() > 0 && (it2.first[0] == '\\' || it2.first[0] == '$'));
                }
                for (auto &it2 : it.second->parameters) {
                        assert(it2.first.size() > 0 && (it2.first[0] == '\\' || it2.first[0] == '$'));
                }
                InternalCellChecker checker(this, it.second);
                checker.check();
        }

        for (auto &it : processes) {
                assert(it.first == it.second->name);
                assert(it.first.size() > 0 && (it.first[0] == '\\' || it.first[0] == '$'));
                // FIXME: More checks here..
        }

        for (auto &it : connections) {
                assert(it.first.size() == it.second.size());
                it.first.check();
                it.second.check();
        }

        for (auto &it : attributes) {
                assert(it.first.size() > 0 && (it.first[0] == '\\' || it.first[0] == '$'));
        }
#endif
}

void RTLIL::Module::optimize()
{
}

void RTLIL::Module::cloneInto(RTLIL::Module *new_mod) const
{
        new_mod->name = name;
        new_mod->connections = connections;
        new_mod->attributes = attributes;

        for (auto &it : wires)
                new_mod->wires[it.first] = new RTLIL::Wire(*it.second);

        for (auto &it : memories)
                new_mod->memories[it.first] = new RTLIL::Memory(*it.second);

        for (auto &it : cells)
                new_mod->cells[it.first] = new RTLIL::Cell(*it.second);

        for (auto &it : processes)
                new_mod->processes[it.first] = it.second->clone();

        struct RewriteSigSpecWorker
        {
                RTLIL::Module *mod;
                void operator()(RTLIL::SigSpec &sig)
                {
                        std::vector<RTLIL::SigChunk> chunks = sig.chunks();
                        for (auto &c : chunks)
                                if (c.wire != NULL)
                                        c.wire = mod->wires.at(c.wire->name);
                        sig = chunks;
                }
        };

        RewriteSigSpecWorker rewriteSigSpecWorker;
        rewriteSigSpecWorker.mod = new_mod;
        new_mod->rewrite_sigspecs(rewriteSigSpecWorker);
}

RTLIL::Module *RTLIL::Module::clone() const
{
        RTLIL::Module *new_mod = new RTLIL::Module;
        cloneInto(new_mod);
        return new_mod;
}

void RTLIL::Module::add(RTLIL::Wire *wire)
{
        assert(!wire->name.empty());
        assert(count_id(wire->name) == 0);
        wires[wire->name] = wire;
}

void RTLIL::Module::add(RTLIL::Cell *cell)
{
        assert(!cell->name.empty());
        assert(count_id(cell->name) == 0);
        cells[cell->name] = cell;
}

void RTLIL::Module::remove(RTLIL::Cell *cell)
{
        assert(cells.count(cell->name) != 0);
        cells.erase(cell->name);
        delete cell;
}

static bool fixup_ports_compare(const RTLIL::Wire *a, const RTLIL::Wire *b)
{
        if (a->port_id && !b->port_id)
                return true;
        if (!a->port_id && b->port_id)
                return false;

        if (a->port_id == b->port_id)
                return a->name < b->name;
        return a->port_id < b->port_id;
}

void RTLIL::Module::fixup_ports()
{
        std::vector<RTLIL::Wire*> all_ports;

        for (auto &w : wires)
                if (w.second->port_input || w.second->port_output)
                        all_ports.push_back(w.second);
                else
                        w.second->port_id = 0;

        std::sort(all_ports.begin(), all_ports.end(), fixup_ports_compare);
        for (size_t i = 0; i < all_ports.size(); i++)
                all_ports[i]->port_id = i+1;
}

RTLIL::Wire *RTLIL::Module::addWire(RTLIL::IdString name, int width)
{
        RTLIL::Wire *wire = new RTLIL::Wire;
        wire->name = name;
        wire->width = width;
        add(wire);
        return wire;
}

RTLIL::Cell *RTLIL::Module::addCell(RTLIL::IdString name, RTLIL::IdString type)
{
        RTLIL::Cell *cell = new RTLIL::Cell;
        cell->name = name;
        cell->type = type;
        add(cell);
        return cell;
}

#define DEF_METHOD(_func, _y_size, _type) \
        RTLIL::Cell* RTLIL::Module::add ## _func(RTLIL::IdString name, RTLIL::SigSpec sig_a, RTLIL::SigSpec sig_y, bool is_signed) { \
                RTLIL::Cell *cell = new RTLIL::Cell;                \
                cell->name = name;                                  \
                cell->type = _type;                                 \
                cell->parameters["\\A_SIGNED"] = is_signed;         \
                cell->parameters["\\A_WIDTH"] = sig_a.size();        \
                cell->parameters["\\Y_WIDTH"] = sig_y.size();        \
                cell->connections["\\A"] = sig_a;                   \
                cell->connections["\\Y"] = sig_y;                   \
                add(cell);                                          \
                return cell;                                        \
        } \
        RTLIL::SigSpec RTLIL::Module::_func(RTLIL::IdString name, RTLIL::SigSpec sig_a, bool is_signed) { \
                RTLIL::SigSpec sig_y = addWire(NEW_ID, _y_size);    \
                add ## _func(name, sig_a, sig_y, is_signed);        \
                return sig_y;                                       \
        }
DEF_METHOD(Not,        sig_a.size(), "$not")
DEF_METHOD(Pos,        sig_a.size(), "$pos")
DEF_METHOD(Bu0,        sig_a.size(), "$bu0")
DEF_METHOD(Neg,        sig_a.size(), "$neg")
DEF_METHOD(ReduceAnd,  1, "$reduce_and")
DEF_METHOD(ReduceOr,   1, "$reduce_or")
DEF_METHOD(ReduceXor,  1, "$reduce_xor")
DEF_METHOD(ReduceXnor, 1, "$reduce_xnor")
DEF_METHOD(ReduceBool, 1, "$reduce_bool")
DEF_METHOD(LogicNot,   1, "$logic_not")
#undef DEF_METHOD

#define DEF_METHOD(_func, _y_size, _type) \
        RTLIL::Cell* RTLIL::Module::add ## _func(RTLIL::IdString name, RTLIL::SigSpec sig_a, RTLIL::SigSpec sig_b, RTLIL::SigSpec sig_y, bool is_signed) { \
                RTLIL::Cell *cell = new RTLIL::Cell;                \
                cell->name = name;                                  \
                cell->type = _type;                                 \
                cell->parameters["\\A_SIGNED"] = is_signed;         \
                cell->parameters["\\B_SIGNED"] = is_signed;         \
                cell->parameters["\\A_WIDTH"] = sig_a.size();        \
                cell->parameters["\\B_WIDTH"] = sig_b.size();        \
                cell->parameters["\\Y_WIDTH"] = sig_y.size();        \
                cell->connections["\\A"] = sig_a;                   \
                cell->connections["\\B"] = sig_b;                   \
                cell->connections["\\Y"] = sig_y;                   \
                add(cell);                                          \
                return cell;                                        \
        } \
        RTLIL::SigSpec RTLIL::Module::_func(RTLIL::IdString name, RTLIL::SigSpec sig_a, RTLIL::SigSpec sig_b, bool is_signed) { \
                RTLIL::SigSpec sig_y = addWire(NEW_ID, _y_size);    \
                add ## _func(name, sig_a, sig_b, sig_y, is_signed); \
                return sig_y;                                       \
        }
DEF_METHOD(And,      std::max(sig_a.size(), sig_b.size()), "$and")
DEF_METHOD(Or,       std::max(sig_a.size(), sig_b.size()), "$or")
DEF_METHOD(Xor,      std::max(sig_a.size(), sig_b.size()), "$xor")
DEF_METHOD(Xnor,     std::max(sig_a.size(), sig_b.size()), "$xnor")
DEF_METHOD(Shl,      sig_a.size(), "$shl")
DEF_METHOD(Shr,      sig_a.size(), "$shr")
DEF_METHOD(Sshl,     sig_a.size(), "$sshl")
DEF_METHOD(Sshr,     sig_a.size(), "$sshr")
DEF_METHOD(Lt,       1, "$lt")
DEF_METHOD(Le,       1, "$le")
DEF_METHOD(Eq,       1, "$eq")
DEF_METHOD(Ne,       1, "$ne")
DEF_METHOD(Eqx,      1, "$eqx")
DEF_METHOD(Nex,      1, "$nex")
DEF_METHOD(Ge,       1, "$ge")
DEF_METHOD(Gt,       1, "$gt")
DEF_METHOD(Add,      std::max(sig_a.size(), sig_b.size()), "$add")
DEF_METHOD(Sub,      std::max(sig_a.size(), sig_b.size()), "$sub")
DEF_METHOD(Mul,      std::max(sig_a.size(), sig_b.size()), "$mul")
DEF_METHOD(Div,      std::max(sig_a.size(), sig_b.size()), "$div")
DEF_METHOD(Mod,      std::max(sig_a.size(), sig_b.size()), "$mod")
DEF_METHOD(LogicAnd, 1, "$logic_and")
DEF_METHOD(LogicOr,  1, "$logic_or")
#undef DEF_METHOD

#define DEF_METHOD(_func, _type, _pmux) \
        RTLIL::Cell* RTLIL::Module::add ## _func(RTLIL::IdString name, RTLIL::SigSpec sig_a, RTLIL::SigSpec sig_b, RTLIL::SigSpec sig_s, RTLIL::SigSpec sig_y) { \
                RTLIL::Cell *cell = new RTLIL::Cell;                     \
                cell->name = name;                                       \
                cell->type = _type;                                      \
                cell->parameters["\\WIDTH"] = sig_a.size();               \
                cell->parameters["\\WIDTH"] = sig_b.size();               \
                if (_pmux) cell->parameters["\\S_WIDTH"] = sig_s.size();  \
                cell->connections["\\A"] = sig_a;                        \
                cell->connections["\\B"] = sig_b;                        \
                cell->connections["\\S"] = sig_s;                        \
                cell->connections["\\Y"] = sig_y;                        \
                add(cell);                                               \
                return cell;                                             \
        } \
        RTLIL::SigSpec RTLIL::Module::_func(RTLIL::IdString name, RTLIL::SigSpec sig_a, RTLIL::SigSpec sig_b, RTLIL::SigSpec sig_s) { \
                RTLIL::SigSpec sig_y = addWire(NEW_ID, sig_a.size());     \
                add ## _func(name, sig_a, sig_b, sig_s, sig_y);          \
                return sig_y;                                            \
        }
DEF_METHOD(Mux,      "$mux",        0)
DEF_METHOD(Pmux,     "$pmux",       1)
DEF_METHOD(SafePmux, "$safe_pmux",  1)
#undef DEF_METHOD

#define DEF_METHOD_2(_func, _type, _P1, _P2) \
        RTLIL::Cell* RTLIL::Module::add ## _func(RTLIL::IdString name, RTLIL::SigSpec sig1, RTLIL::SigSpec sig2) { \
                RTLIL::Cell *cell = new RTLIL::Cell;        \
                cell->name = name;                          \
                cell->type = _type;                         \
                cell->connections["\\" #_P1] = sig1;        \
                cell->connections["\\" #_P2] = sig2;        \
                add(cell);                                  \
                return cell;                                \
        } \
        RTLIL::SigSpec RTLIL::Module::_func(RTLIL::IdString name, RTLIL::SigSpec sig1) { \
                RTLIL::SigSpec sig2 = addWire(NEW_ID);      \
                add ## _func(name, sig1, sig2);             \
                return sig2;                                \
        }
#define DEF_METHOD_3(_func, _type, _P1, _P2, _P3) \
        RTLIL::Cell* RTLIL::Module::add ## _func(RTLIL::IdString name, RTLIL::SigSpec sig1, RTLIL::SigSpec sig2, RTLIL::SigSpec sig3) { \
                RTLIL::Cell *cell = new RTLIL::Cell;        \
                cell->name = name;                          \
                cell->type = _type;                         \
                cell->connections["\\" #_P1] = sig1;        \
                cell->connections["\\" #_P2] = sig2;        \
                cell->connections["\\" #_P3] = sig3;        \
                add(cell);                                  \
                return cell;                                \
        } \
        RTLIL::SigSpec RTLIL::Module::_func(RTLIL::IdString name, RTLIL::SigSpec sig1, RTLIL::SigSpec sig2) { \
                RTLIL::SigSpec sig3 = addWire(NEW_ID);      \
                add ## _func(name, sig1, sig2, sig3);       \
                return sig3;                                \
        }
#define DEF_METHOD_4(_func, _type, _P1, _P2, _P3, _P4) \
        RTLIL::Cell* RTLIL::Module::add ## _func(RTLIL::IdString name, RTLIL::SigSpec sig1, RTLIL::SigSpec sig2, RTLIL::SigSpec sig3, RTLIL::SigSpec sig4) { \
                RTLIL::Cell *cell = new RTLIL::Cell;        \
                cell->name = name;                          \
                cell->type = _type;                         \
                cell->connections["\\" #_P1] = sig1;        \
                cell->connections["\\" #_P2] = sig2;        \
                cell->connections["\\" #_P3] = sig3;        \
                cell->connections["\\" #_P4] = sig4;        \
                add(cell);                                  \
                return cell;                                \
        } \
        RTLIL::SigSpec RTLIL::Module::_func(RTLIL::IdString name, RTLIL::SigSpec sig1, RTLIL::SigSpec sig2, RTLIL::SigSpec sig3) { \
                RTLIL::SigSpec sig4 = addWire(NEW_ID);      \
                add ## _func(name, sig1, sig2, sig3, sig4); \
                return sig4;                                \
        }
DEF_METHOD_2(InvGate, "$_INV_", A, Y)
DEF_METHOD_3(AndGate, "$_AND_", A, B, Y)
DEF_METHOD_3(OrGate,  "$_OR_",  A, B, Y)
DEF_METHOD_3(XorGate, "$_XOR_", A, B, Y)
DEF_METHOD_4(MuxGate, "$_MUX_", A, B, S, Y)
#undef DEF_METHOD_2
#undef DEF_METHOD_3
#undef DEF_METHOD_4

RTLIL::Cell* RTLIL::Module::addPow(RTLIL::IdString name, RTLIL::SigSpec sig_a, RTLIL::SigSpec sig_b, RTLIL::SigSpec sig_y, bool a_signed, bool b_signed)
{
        RTLIL::Cell *cell = new RTLIL::Cell;
        cell->name = name;
        cell->type = "$pow";
        cell->parameters["\\A_SIGNED"] = a_signed;
        cell->parameters["\\B_SIGNED"] = b_signed;
        cell->parameters["\\A_WIDTH"] = sig_a.size();
        cell->parameters["\\B_WIDTH"] = sig_b.size();
        cell->parameters["\\Y_WIDTH"] = sig_y.size();
        cell->connections["\\A"] = sig_a;
        cell->connections["\\B"] = sig_b;
        cell->connections["\\Y"] = sig_y;
        add(cell);
        return cell;
}

RTLIL::Cell* RTLIL::Module::addSlice(RTLIL::IdString name, RTLIL::SigSpec sig_a, RTLIL::SigSpec sig_y, RTLIL::Const offset)
{
        RTLIL::Cell *cell = new RTLIL::Cell;
        cell->name = name;
        cell->type = "$slice";
        cell->parameters["\\A_WIDTH"] = sig_a.size();
        cell->parameters["\\Y_WIDTH"] = sig_y.size();
        cell->parameters["\\OFFSET"] = offset;
        cell->connections["\\A"] = sig_a;
        cell->connections["\\Y"] = sig_y;
        add(cell);
        return cell;
}

RTLIL::Cell* RTLIL::Module::addConcat(RTLIL::IdString name, RTLIL::SigSpec sig_a, RTLIL::SigSpec sig_b, RTLIL::SigSpec sig_y)
{
        RTLIL::Cell *cell = new RTLIL::Cell;
        cell->name = name;
        cell->type = "$concat";
        cell->parameters["\\A_WIDTH"] = sig_a.size();
        cell->parameters["\\B_WIDTH"] = sig_b.size();
        cell->connections["\\A"] = sig_a;
        cell->connections["\\B"] = sig_b;
        cell->connections["\\Y"] = sig_y;
        add(cell);
        return cell;
}

RTLIL::Cell* RTLIL::Module::addLut(RTLIL::IdString name, RTLIL::SigSpec sig_i, RTLIL::SigSpec sig_o, RTLIL::Const lut)
{
        RTLIL::Cell *cell = new RTLIL::Cell;
        cell->name = name;
        cell->type = "$lut";
        cell->parameters["\\LUT"] = lut;
        cell->parameters["\\WIDTH"] = sig_i.size();
        cell->connections["\\I"] = sig_i;
        cell->connections["\\O"] = sig_o;
        add(cell);
        return cell;
}

RTLIL::Cell* RTLIL::Module::addAssert(RTLIL::IdString name, RTLIL::SigSpec sig_a, RTLIL::SigSpec sig_en)
{
        RTLIL::Cell *cell = new RTLIL::Cell;
        cell->name = name;
        cell->type = "$assert";
        cell->connections["\\A"] = sig_a;
        cell->connections["\\EN"] = sig_en;
        add(cell);
        return cell;
}

RTLIL::Cell* RTLIL::Module::addSr(RTLIL::IdString name, RTLIL::SigSpec sig_set, RTLIL::SigSpec sig_clr, RTLIL::SigSpec sig_q, bool set_polarity, bool clr_polarity)
{
        RTLIL::Cell *cell = new RTLIL::Cell;
        cell->name = name;
        cell->type = "$sr";
        cell->parameters["\\SET_POLARITY"] = set_polarity;
        cell->parameters["\\CLR_POLARITY"] = clr_polarity;
        cell->parameters["\\WIDTH"] = sig_q.size();
        cell->connections["\\SET"] = sig_set;
        cell->connections["\\CLR"] = sig_clr;
        cell->connections["\\Q"] = sig_q;
        add(cell);
        return cell;
}

RTLIL::Cell* RTLIL::Module::addDff(RTLIL::IdString name, RTLIL::SigSpec sig_clk, RTLIL::SigSpec sig_d,   RTLIL::SigSpec sig_q, bool clk_polarity)
{
        RTLIL::Cell *cell = new RTLIL::Cell;
        cell->name = name;
        cell->type = "$dff";
        cell->parameters["\\CLK_POLARITY"] = clk_polarity;
        cell->parameters["\\WIDTH"] = sig_q.size();
        cell->connections["\\CLK"] = sig_clk;
        cell->connections["\\D"] = sig_d;
        cell->connections["\\Q"] = sig_q;
        add(cell);
        return cell;
}

RTLIL::Cell* RTLIL::Module::addDffsr(RTLIL::IdString name, RTLIL::SigSpec sig_clk, RTLIL::SigSpec sig_set, RTLIL::SigSpec sig_clr,
                RTLIL::SigSpec sig_d, RTLIL::SigSpec sig_q, bool clk_polarity, bool set_polarity, bool clr_polarity)
{
        RTLIL::Cell *cell = new RTLIL::Cell;
        cell->name = name;
        cell->type = "$dffsr";
        cell->parameters["\\CLK_POLARITY"] = clk_polarity;
        cell->parameters["\\SET_POLARITY"] = set_polarity;
        cell->parameters["\\CLR_POLARITY"] = clr_polarity;
        cell->parameters["\\WIDTH"] = sig_q.size();
        cell->connections["\\CLK"] = sig_clk;
        cell->connections["\\SET"] = sig_set;
        cell->connections["\\CLR"] = sig_clr;
        cell->connections["\\D"] = sig_d;
        cell->connections["\\Q"] = sig_q;
        add(cell);
        return cell;
}

RTLIL::Cell* RTLIL::Module::addAdff(RTLIL::IdString name, RTLIL::SigSpec sig_clk, RTLIL::SigSpec sig_arst, RTLIL::SigSpec sig_d, RTLIL::SigSpec sig_q,
                RTLIL::Const arst_value, bool clk_polarity, bool arst_polarity)
{
        RTLIL::Cell *cell = new RTLIL::Cell;
        cell->name = name;
        cell->type = "$adff";
        cell->parameters["\\CLK_POLARITY"] = clk_polarity;
        cell->parameters["\\ARST_POLARITY"] = arst_polarity;
        cell->parameters["\\ARST_VALUE"] = arst_value;
        cell->parameters["\\WIDTH"] = sig_q.size();
        cell->connections["\\CLK"] = sig_clk;
        cell->connections["\\ARST"] = sig_arst;
        cell->connections["\\D"] = sig_d;
        cell->connections["\\Q"] = sig_q;
        add(cell);
        return cell;
}

RTLIL::Cell* RTLIL::Module::addDlatch(RTLIL::IdString name, RTLIL::SigSpec sig_en, RTLIL::SigSpec sig_d, RTLIL::SigSpec sig_q, bool en_polarity)
{
        RTLIL::Cell *cell = new RTLIL::Cell;
        cell->name = name;
        cell->type = "$dlatch";
        cell->parameters["\\EN_POLARITY"] = en_polarity;
        cell->parameters["\\WIDTH"] = sig_q.size();
        cell->connections["\\EN"] = sig_en;
        cell->connections["\\D"] = sig_d;
        cell->connections["\\Q"] = sig_q;
        add(cell);
        return cell;
}

RTLIL::Cell* RTLIL::Module::addDlatchsr(RTLIL::IdString name, RTLIL::SigSpec sig_en, RTLIL::SigSpec sig_set, RTLIL::SigSpec sig_clr,
                RTLIL::SigSpec sig_d, RTLIL::SigSpec sig_q, bool en_polarity, bool set_polarity, bool clr_polarity)
{
        RTLIL::Cell *cell = new RTLIL::Cell;
        cell->name = name;
        cell->type = "$dlatchsr";
        cell->parameters["\\EN_POLARITY"] = en_polarity;
        cell->parameters["\\SET_POLARITY"] = set_polarity;
        cell->parameters["\\CLR_POLARITY"] = clr_polarity;
        cell->parameters["\\WIDTH"] = sig_q.size();
        cell->connections["\\EN"] = sig_en;
        cell->connections["\\SET"] = sig_set;
        cell->connections["\\CLR"] = sig_clr;
        cell->connections["\\D"] = sig_d;
        cell->connections["\\Q"] = sig_q;
        add(cell);
        return cell;
}

RTLIL::Cell* RTLIL::Module::addDffGate(RTLIL::IdString name, RTLIL::SigSpec sig_clk, RTLIL::SigSpec sig_d, RTLIL::SigSpec sig_q, bool clk_polarity)
{
        RTLIL::Cell *cell = new RTLIL::Cell;
        cell->name = name;
        cell->type = stringf("$_DFF_%c_", clk_polarity ? 'P' : 'N');
        cell->connections["\\C"] = sig_clk;
        cell->connections["\\D"] = sig_d;
        cell->connections["\\Q"] = sig_q;
        add(cell);
        return cell;
}

RTLIL::Cell* RTLIL::Module::addDffsrGate(RTLIL::IdString name, RTLIL::SigSpec sig_clk, RTLIL::SigSpec sig_set, RTLIL::SigSpec sig_clr,
                RTLIL::SigSpec sig_d, RTLIL::SigSpec sig_q, bool clk_polarity, bool set_polarity, bool clr_polarity)
{
        RTLIL::Cell *cell = new RTLIL::Cell;
        cell->name = name;
        cell->type = stringf("$_DFFSR_%c%c%c_", clk_polarity ? 'P' : 'N', set_polarity ? 'P' : 'N', clr_polarity ? 'P' : 'N');
        cell->connections["\\C"] = sig_clk;
        cell->connections["\\S"] = sig_set;
        cell->connections["\\R"] = sig_clr;
        cell->connections["\\D"] = sig_d;
        cell->connections["\\Q"] = sig_q;
        add(cell);
        return cell;
}

RTLIL::Cell* RTLIL::Module::addAdffGate(RTLIL::IdString name, RTLIL::SigSpec sig_clk, RTLIL::SigSpec sig_arst, RTLIL::SigSpec sig_d, RTLIL::SigSpec sig_q,
                bool arst_value, bool clk_polarity, bool arst_polarity)
{
        RTLIL::Cell *cell = new RTLIL::Cell;
        cell->name = name;
        cell->type = stringf("$_DFF_%c%c%c_", clk_polarity ? 'P' : 'N', arst_polarity ? 'P' : 'N', arst_value ? '1' : '0');
        cell->connections["\\C"] = sig_clk;
        cell->connections["\\R"] = sig_arst;
        cell->connections["\\D"] = sig_d;
        cell->connections["\\Q"] = sig_q;
        add(cell);
        return cell;
}

RTLIL::Cell* RTLIL::Module::addDlatchGate(RTLIL::IdString name, RTLIL::SigSpec sig_en, RTLIL::SigSpec sig_d, RTLIL::SigSpec sig_q, bool en_polarity)
{
        RTLIL::Cell *cell = new RTLIL::Cell;
        cell->name = name;
        cell->type = stringf("$_DLATCH_%c_", en_polarity ? 'P' : 'N');
        cell->connections["\\E"] = sig_en;
        cell->connections["\\D"] = sig_d;
        cell->connections["\\Q"] = sig_q;
        add(cell);
        return cell;
}

RTLIL::Cell* RTLIL::Module::addDlatchsrGate(RTLIL::IdString name, RTLIL::SigSpec sig_en, RTLIL::SigSpec sig_set, RTLIL::SigSpec sig_clr,
                RTLIL::SigSpec sig_d, RTLIL::SigSpec sig_q, bool en_polarity, bool set_polarity, bool clr_polarity)
{
        RTLIL::Cell *cell = new RTLIL::Cell;
        cell->name = name;
        cell->type = stringf("$_DLATCHSR_%c%c%c_", en_polarity ? 'P' : 'N', set_polarity ? 'P' : 'N', clr_polarity ? 'P' : 'N');
        cell->connections["\\E"] = sig_en;
        cell->connections["\\S"] = sig_set;
        cell->connections["\\R"] = sig_clr;
        cell->connections["\\D"] = sig_d;
        cell->connections["\\Q"] = sig_q;
        add(cell);
        return cell;
}


RTLIL::Wire::Wire()
{
        width = 1;
        start_offset = 0;
        port_id = 0;
        port_input = false;
        port_output = false;
}

RTLIL::Memory::Memory()
{
        width = 1;
        size = 0;
}

void RTLIL::Cell::check()
{
#ifndef NDEBUG
        InternalCellChecker checker(NULL, this);
        checker.check();
#endif
}

RTLIL::SigChunk::SigChunk()
{
        wire = NULL;
        width = 0;
        offset = 0;
}

RTLIL::SigChunk::SigChunk(const RTLIL::Const &value)
{
        wire = NULL;
        data = value;
        width = data.bits.size();
        offset = 0;
}

RTLIL::SigChunk::SigChunk(RTLIL::Wire *wire)
{
        this->wire = wire;
        this->width = wire->width;
        this->offset = 0;
}

RTLIL::SigChunk::SigChunk(RTLIL::Wire *wire, int offset, int width)
{
        this->wire = wire;
        this->width = width;
        this->offset = offset;
}

RTLIL::SigChunk::SigChunk(const std::string &str)
{
        wire = NULL;
        data = RTLIL::Const(str);
        width = data.bits.size();
        offset = 0;
}

RTLIL::SigChunk::SigChunk(int val, int width)
{
        wire = NULL;
        data = RTLIL::Const(val, width);
        this->width = data.bits.size();
        offset = 0;
}

RTLIL::SigChunk::SigChunk(RTLIL::State bit, int width)
{
        wire = NULL;
        data = RTLIL::Const(bit, width);
        this->width = data.bits.size();
        offset = 0;
}

RTLIL::SigChunk::SigChunk(RTLIL::SigBit bit)
{
        wire = bit.wire;
        if (wire == NULL)
                data = RTLIL::Const(bit.data);
        offset = bit.offset;
        width = 1;
}

RTLIL::SigChunk RTLIL::SigChunk::extract(int offset, int length) const
{
        RTLIL::SigChunk ret;
        if (wire) {
                ret.wire = wire;
                ret.offset = this->offset + offset;
                ret.width = length;
        } else {
                for (int i = 0; i < length; i++)
                        ret.data.bits.push_back(data.bits[offset+i]);
                ret.width = length;
        }
        return ret;
}

bool RTLIL::SigChunk::operator <(const RTLIL::SigChunk &other) const
{
        if (wire && other.wire)
                if (wire->name != other.wire->name)
                        return wire->name < other.wire->name;

        if (wire != other.wire)
                return wire < other.wire;

        if (offset != other.offset)
                return offset < other.offset;

        if (width != other.width)
                return width < other.width;

        return data.bits < other.data.bits;
}

bool RTLIL::SigChunk::operator ==(const RTLIL::SigChunk &other) const
{
        if (wire != other.wire || width != other.width || offset != other.offset)
                return false;
        if (data.bits != other.data.bits)
                return false;
        return true;
}

bool RTLIL::SigChunk::operator !=(const RTLIL::SigChunk &other) const
{
        if (*this == other)
                return false;
        return true;
}

RTLIL::SigSpec::SigSpec()
{
        width_ = 0;
}

RTLIL::SigSpec::SigSpec(const RTLIL::Const &value)
{
        chunks_.push_back(RTLIL::SigChunk(value));
        width_ = chunks_.back().width;
        check();
}

RTLIL::SigSpec::SigSpec(const RTLIL::SigChunk &chunk)
{
        chunks_.push_back(chunk);
        width_ = chunks_.back().width;
        check();
}

RTLIL::SigSpec::SigSpec(RTLIL::Wire *wire)
{
        chunks_.push_back(RTLIL::SigChunk(wire));
        width_ = chunks_.back().width;
        check();
}

RTLIL::SigSpec::SigSpec(RTLIL::Wire *wire, int offset, int width)
{
        chunks_.push_back(RTLIL::SigChunk(wire, offset, width));
        width_ = chunks_.back().width;
        check();
}

RTLIL::SigSpec::SigSpec(const std::string &str)
{
        chunks_.push_back(RTLIL::SigChunk(str));
        width_ = chunks_.back().width;
        check();
}

RTLIL::SigSpec::SigSpec(int val, int width)
{
        chunks_.push_back(RTLIL::SigChunk(val, width));
        width_ = width;
        check();
}

RTLIL::SigSpec::SigSpec(RTLIL::State bit, int width)
{
        chunks_.push_back(RTLIL::SigChunk(bit, width));
        width_ = width;
        check();
}

RTLIL::SigSpec::SigSpec(RTLIL::SigBit bit, int width)
{
        if (bit.wire == NULL)
                chunks_.push_back(RTLIL::SigChunk(bit.data, width));
        else
                for (int i = 0; i < width; i++)
                        chunks_.push_back(bit);
        width_ = width;
        check();
}

RTLIL::SigSpec::SigSpec(std::vector<RTLIL::SigChunk> chunks)
{
        width_ = 0;
        for (auto &c : chunks)
                append(c);
        check();
}

RTLIL::SigSpec::SigSpec(std::vector<RTLIL::SigBit> bits)
{
        width_ = 0;
        for (auto &bit : bits)
                append_bit(bit);
        check();
}

RTLIL::SigSpec::SigSpec(std::set<RTLIL::SigBit> bits)
{
        width_ = 0;
        for (auto &bit : bits)
                append_bit(bit);
        check();
}

void RTLIL::SigSpec::pack() const
{
        RTLIL::SigSpec *that = (RTLIL::SigSpec*)this;

        if (that->bits_.empty())
                return;

        log_assert(that->chunks_.empty());

        std::vector<RTLIL::SigBit> old_bits;
        old_bits.swap(that->bits_);

        that->width_ = 0;
        for (auto &bit : old_bits)
                that->append_bit(bit);
}

void RTLIL::SigSpec::unpack() const
{
        RTLIL::SigSpec *that = (RTLIL::SigSpec*)this;

        if (that->chunks_.empty())
                return;

        log_assert(that->bits_.empty());

        that->bits_.reserve(that->width_);
        for (auto &c : that->chunks_)
                for (int i = 0; i < c.width; i++)
                        that->bits_.push_back(RTLIL::SigBit(c, i));

        that->chunks_.clear();
}

bool RTLIL::SigSpec::packed() const
{
        return bits_.empty();
}

void RTLIL::SigSpec::sort()
{
        unpack();
        std::sort(bits_.begin(), bits_.end());
}

void RTLIL::SigSpec::sort_and_unify()
{
        *this = this->to_sigbit_set();
}

void RTLIL::SigSpec::replace(const RTLIL::SigSpec &pattern, const RTLIL::SigSpec &with)
{
        replace(pattern, with, this);
}

void RTLIL::SigSpec::replace(const RTLIL::SigSpec &pattern, const RTLIL::SigSpec &with, RTLIL::SigSpec *other) const
{
        unpack();
        pattern.unpack();
        with.unpack();

        assert(other != NULL);
        assert(width_ == other->width_);
        other->unpack();

        assert(pattern.width_ == with.width_);

        std::map<RTLIL::SigBit, RTLIL::SigBit> pattern_map;
        for (int i = 0; i < SIZE(pattern.bits_); i++)
                if (pattern.bits_[i].wire != NULL)
                        pattern_map[pattern.bits_[i]] = with.bits_[i];

        for (int i = 0; i < SIZE(bits_); i++)
                if (pattern_map.count(bits_[i]))
                        other->bits_[i] = pattern_map.at(bits_[i]);

        other->check();
}

void RTLIL::SigSpec::remove(const RTLIL::SigSpec &pattern)
{
        remove2(pattern, NULL);
}

void RTLIL::SigSpec::remove(const RTLIL::SigSpec &pattern, RTLIL::SigSpec *other) const
{
        RTLIL::SigSpec tmp = *this;
        tmp.remove2(pattern, other);
}

void RTLIL::SigSpec::remove2(const RTLIL::SigSpec &pattern, RTLIL::SigSpec *other)
{
        unpack();

        if (other != NULL) {
                assert(width_ == other->width_);
                other->unpack();
        }

        std::set<RTLIL::SigBit> pattern_bits = pattern.to_sigbit_set();
        std::vector<RTLIL::SigBit> new_bits, new_other_bits;

        for (int i = 0; i < SIZE(bits_); i++) {
                if (bits_[i].wire != NULL && pattern_bits.count(bits_[i]))
                        continue;
                if (other != NULL)
                        new_other_bits.push_back(other->bits_[i]);
                new_bits.push_back(bits_[i]);
        }

        bits_.swap(new_bits);
        width_ = SIZE(bits_);

        if (other != NULL) {
                other->bits_.swap(new_other_bits);
                other->width_ = SIZE(other->bits_);
        }

        check();
}

RTLIL::SigSpec RTLIL::SigSpec::extract(RTLIL::SigSpec pattern, RTLIL::SigSpec *other) const
{
        pack();
        pattern.pack();

        if (other != NULL)
                other->pack();

        assert(other == NULL || width_ == other->width_);

        std::set<RTLIL::SigBit> pat = pattern.to_sigbit_set();
        std::vector<RTLIL::SigBit> bits_match = to_sigbit_vector();
        RTLIL::SigSpec ret;

        if (other) {
                std::vector<RTLIL::SigBit> bits_other = other ? other->to_sigbit_vector() : bits_match;
                for (int i = 0; i < width_; i++)
                        if (bits_match[i].wire && pat.count(bits_match[i]))
                                ret.append_bit(bits_other[i]);
        } else {
                for (int i = 0; i < width_; i++)
                        if (bits_match[i].wire && pat.count(bits_match[i]))
                                ret.append_bit(bits_match[i]);
        }

        ret.check();
        return ret;
}

void RTLIL::SigSpec::replace(int offset, const RTLIL::SigSpec &with)
{
        unpack();
        with.unpack();

        assert(offset >= 0);
        assert(with.width_ >= 0);
        assert(offset+with.width_ <= width_);

        for (int i = 0; i < with.width_; i++)
                bits_.at(offset + i) = with.bits_.at(i);

        check();
}

void RTLIL::SigSpec::remove_const()
{
        unpack();

        std::vector<RTLIL::SigBit> new_bits;
        new_bits.reserve(width_);

        for (auto &bit : bits_)
                if (bit.wire != NULL)
                        new_bits.push_back(bit);

        bits_.swap(new_bits);
        width_ = bits_.size();

        check();
}

void RTLIL::SigSpec::remove(int offset, int length)
{
        unpack();

        assert(offset >= 0);
        assert(length >= 0);
        assert(offset + length <= width_);

        bits_.erase(bits_.begin() + offset, bits_.begin() + offset + length);
        width_ = bits_.size();

        check();
}

RTLIL::SigSpec RTLIL::SigSpec::extract(int offset, int length) const
{
        unpack();
        return std::vector<RTLIL::SigBit>(bits_.begin() + offset, bits_.begin() + offset + length);
}

void RTLIL::SigSpec::append(const RTLIL::SigSpec &signal)
{
        if (signal.width_ == 0)
                return;

        if (width_ == 0) {
                *this = signal;
                return;
        }

        if (packed() != signal.packed()) {
                pack();
                signal.pack();
        }

        if (packed())
                for (auto &other_c : signal.chunks_)
                {
                        auto &my_last_c = chunks_.back();
                        if (my_last_c.wire == NULL && other_c.wire == NULL) {
                                auto &this_data = my_last_c.data.bits;
                                auto &other_data = other_c.data.bits;
                                this_data.insert(this_data.end(), other_data.begin(), other_data.end());
                                my_last_c.width += other_c.width;
                        } else
                        if (my_last_c.wire == other_c.wire && my_last_c.offset + my_last_c.width == other_c.offset) {
                                my_last_c.width += other_c.width;
                        } else
                                chunks_.push_back(other_c);
                }
        else
                bits_.insert(bits_.end(), signal.bits_.begin(), signal.bits_.end());

        width_ += signal.width_;

        check();
}

void RTLIL::SigSpec::append_bit(const RTLIL::SigBit &bit)
{
        if (packed())
        {
                if (chunks_.size() == 0)
                        chunks_.push_back(bit);
                else
                        if (bit.wire == NULL)
                                if (chunks_.back().wire == NULL) {
                                        chunks_.back().data.bits.push_back(bit.data);
                                        chunks_.back().width++;
                                } else
                                        chunks_.push_back(bit);
                        else
                                if (chunks_.back().wire == bit.wire && chunks_.back().offset + chunks_.back().width == bit.offset)
                                        chunks_.back().width++;
                                else
                                        chunks_.push_back(bit);
        }
        else
                bits_.push_back(bit);

        width_++;

        check();
}

void RTLIL::SigSpec::extend(int width, bool is_signed)
{
        pack();

        if (width_ > width)
                remove(width, width_ - width);
        
        if (width_ < width) {
                RTLIL::SigSpec padding = width_ > 0 ? extract(width_ - 1, 1) : RTLIL::SigSpec(RTLIL::State::S0);
                if (!is_signed && padding != RTLIL::SigSpec(RTLIL::State::Sx) && padding != RTLIL::SigSpec(RTLIL::State::Sz) &&
                                padding != RTLIL::SigSpec(RTLIL::State::Sa) && padding != RTLIL::SigSpec(RTLIL::State::Sm))
                        padding = RTLIL::SigSpec(RTLIL::State::S0);
                while (width_ < width)
                        append(padding);
        }
}

void RTLIL::SigSpec::extend_u0(int width, bool is_signed)
{
        pack();

        if (width_ > width)
                remove(width, width_ - width);
        
        if (width_ < width) {
                RTLIL::SigSpec padding = width_ > 0 ? extract(width_ - 1, 1) : RTLIL::SigSpec(RTLIL::State::S0);
                if (!is_signed)
                        padding = RTLIL::SigSpec(RTLIL::State::S0);
                while (width_ < width)
                        append(padding);
        }

}

RTLIL::SigSpec RTLIL::SigSpec::repeat(int num) const
{
        RTLIL::SigSpec sig;
        for (int i = 0; i < num; i++)
                sig.append(*this);
        return sig;
}

void RTLIL::SigSpec::check() const
{
#ifndef NDEBUG
        if (packed())
        {
                int w = 0;
                for (size_t i = 0; i < chunks_.size(); i++) {
                        const RTLIL::SigChunk chunk = chunks_[i];
                        if (chunk.wire == NULL) {
                                if (i > 0)
                                        assert(chunks_[i-1].wire != NULL);
                                assert(chunk.offset == 0);
                                assert(chunk.data.bits.size() == (size_t)chunk.width);
                        } else {
                                if (i > 0 && chunks_[i-1].wire == chunk.wire)
                                        assert(chunk.offset != chunks_[i-1].offset + chunks_[i-1].width);
                                assert(chunk.offset >= 0);
                                assert(chunk.width >= 0);
                                assert(chunk.offset + chunk.width <= chunk.wire->width);
                                assert(chunk.data.bits.size() == 0);
                        }
                        w += chunk.width;
                }
                assert(w == width_);
                assert(bits_.empty());
        }
        else
        {
                assert(width_ == SIZE(bits_));
                assert(chunks_.empty());
        }
#endif
}

bool RTLIL::SigSpec::operator <(const RTLIL::SigSpec &other) const
{
        pack();
        other.pack();

        if (width_ != other.width_)
                return width_ < other.width_;

        RTLIL::SigSpec a = *this, b = other;

        if (a.chunks_.size() != b.chunks_.size())
                return a.chunks_.size() < b.chunks_.size();

        for (size_t i = 0; i < a.chunks_.size(); i++)
                if (a.chunks_[i] != b.chunks_[i])
                        return a.chunks_[i] < b.chunks_[i];

        return false;
}

bool RTLIL::SigSpec::operator ==(const RTLIL::SigSpec &other) const
{
        pack();
        other.pack();

        if (width_ != other.width_)
                return false;

        RTLIL::SigSpec a = *this, b = other;

        if (a.chunks_.size() != b.chunks_.size())
                return false;

        for (size_t i = 0; i < a.chunks_.size(); i++)
                if (a.chunks_[i] != b.chunks_[i])
                        return false;

        return true;
}

bool RTLIL::SigSpec::is_fully_const() const
{
        pack();
        for (auto it = chunks_.begin(); it != chunks_.end(); it++)
                if (it->width > 0 && it->wire != NULL)
                        return false;
        return true;
}

bool RTLIL::SigSpec::is_fully_def() const
{
        pack();
        for (auto it = chunks_.begin(); it != chunks_.end(); it++) {
                if (it->width > 0 && it->wire != NULL)
                        return false;
                for (size_t i = 0; i < it->data.bits.size(); i++)
                        if (it->data.bits[i] != RTLIL::State::S0 && it->data.bits[i] != RTLIL::State::S1)
                                return false;
        }
        return true;
}

bool RTLIL::SigSpec::is_fully_undef() const
{
        pack();
        for (auto it = chunks_.begin(); it != chunks_.end(); it++) {
                if (it->width > 0 && it->wire != NULL)
                        return false;
                for (size_t i = 0; i < it->data.bits.size(); i++)
                        if (it->data.bits[i] != RTLIL::State::Sx && it->data.bits[i] != RTLIL::State::Sz)
                                return false;
        }
        return true;
}

bool RTLIL::SigSpec::has_marked_bits() const
{
        pack();
        for (auto it = chunks_.begin(); it != chunks_.end(); it++)
                if (it->width > 0 && it->wire == NULL) {
                        for (size_t i = 0; i < it->data.bits.size(); i++)
                                if (it->data.bits[i] == RTLIL::State::Sm)
                                        return true;
                }
        return false;
}

bool RTLIL::SigSpec::as_bool() const
{
        pack();
        assert(is_fully_const() && SIZE(chunks_) <= 1);
        if (width_)
                return chunks_[0].data.as_bool();
        return false;
}

int RTLIL::SigSpec::as_int() const
{
        pack();
        assert(is_fully_const() && SIZE(chunks_) <= 1);
        if (width_)
                return chunks_[0].data.as_int();
        return 0;
}

std::string RTLIL::SigSpec::as_string() const
{
        pack();
        std::string str;
        for (size_t i = chunks_.size(); i > 0; i--) {
                const RTLIL::SigChunk &chunk = chunks_[i-1];
                if (chunk.wire != NULL)
                        for (int j = 0; j < chunk.width; j++)
                                str += "?";
                else
                        str += chunk.data.as_string();
        }
        return str;
}

RTLIL::Const RTLIL::SigSpec::as_const() const
{
        pack();
        assert(is_fully_const() && SIZE(chunks_) <= 1);
        if (width_)
                return chunks_[0].data;
        return RTLIL::Const();
}

bool RTLIL::SigSpec::match(std::string pattern) const
{
        pack();
        std::string str = as_string();
        assert(pattern.size() == str.size());

        for (size_t i = 0; i < pattern.size(); i++) {
                if (pattern[i] == ' ')
                        continue;
                if (pattern[i] == '*') {
                        if (str[i] != 'z' && str[i] != 'x')
                                return false;
                        continue;
                }
                if (pattern[i] != str[i])
                        return false;
        }

        return true;
}

std::set<RTLIL::SigBit> RTLIL::SigSpec::to_sigbit_set() const
{
        pack();
        std::set<RTLIL::SigBit> sigbits;
        for (auto &c : chunks_)
                for (int i = 0; i < c.width; i++)
                        sigbits.insert(RTLIL::SigBit(c, i));
        return sigbits;
}

std::vector<RTLIL::SigBit> RTLIL::SigSpec::to_sigbit_vector() const
{
        unpack();
        return bits_;
}

RTLIL::SigBit RTLIL::SigSpec::to_single_sigbit() const
{
        pack();
        log_assert(width_ == 1);
        for (auto &c : chunks_)
                if (c.width)
                        return RTLIL::SigBit(c);
        log_abort();
}

static void sigspec_parse_split(std::vector<std::string> &tokens, const std::string &text, char sep)
{
        size_t start = 0, end = 0;
        while ((end = text.find(sep, start)) != std::string::npos) {
                tokens.push_back(text.substr(start, end - start));
                start = end + 1;
        }
        tokens.push_back(text.substr(start));
}

static int sigspec_parse_get_dummy_line_num()
{
        return 0;
}

bool RTLIL::SigSpec::parse(RTLIL::SigSpec &sig, RTLIL::Module *module, std::string str)
{
        std::vector<std::string> tokens;
        sigspec_parse_split(tokens, str, ',');

        sig = RTLIL::SigSpec();
        for (int tokidx = int(tokens.size())-1; tokidx >= 0; tokidx--)
        {
                std::string netname = tokens[tokidx];
                std::string indices;

                if (netname.size() == 0)
                        continue;

                if ('0' <= netname[0] && netname[0] <= '9') {
                        AST::get_line_num = sigspec_parse_get_dummy_line_num;
                        AST::AstNode *ast = VERILOG_FRONTEND::const2ast(netname);
                        if (ast == NULL)
                                return false;
                        sig.append(RTLIL::Const(ast->bits));
                        delete ast;
                        continue;
                }

                if (module == NULL)
                        return false;

                if (netname[0] != '$' && netname[0] != '\\')
                        netname = "\\" + netname;

                if (module->wires.count(netname) == 0) {
                        size_t indices_pos = netname.size()-1;
                        if (indices_pos > 2 && netname[indices_pos] == ']')
                        {
                                indices_pos--;
                                while (indices_pos > 0 && ('0' <= netname[indices_pos] && netname[indices_pos] <= '9')) indices_pos--;
                                if (indices_pos > 0 && netname[indices_pos] == ':') {
                                        indices_pos--;
                                        while (indices_pos > 0 && ('0' <= netname[indices_pos] && netname[indices_pos] <= '9')) indices_pos--;
                                }
                                if (indices_pos > 0 && netname[indices_pos] == '[') {
                                        indices = netname.substr(indices_pos);
                                        netname = netname.substr(0, indices_pos);
                                }
                        }
                }

                if (module->wires.count(netname) == 0)
                        return false;

                RTLIL::Wire *wire = module->wires.at(netname);
                if (!indices.empty()) {
                        std::vector<std::string> index_tokens;
                        sigspec_parse_split(index_tokens, indices.substr(1, indices.size()-2), ':');
                        if (index_tokens.size() == 1)
                                sig.append(RTLIL::SigSpec(wire, atoi(index_tokens.at(0).c_str())));
                        else {
                                int a = atoi(index_tokens.at(0).c_str());
                                int b = atoi(index_tokens.at(1).c_str());
                                if (a > b) {
                                        int tmp = a;
                                        a = b, b = tmp;
                                }
                                sig.append(RTLIL::SigSpec(wire, a, b-a+1));
                        }
                } else
                        sig.append(wire);
        }

        return true;
}

bool RTLIL::SigSpec::parse_sel(RTLIL::SigSpec &sig, RTLIL::Design *design, RTLIL::Module *module, std::string str)
{
        if (str.empty() || str[0] != '@')
                return parse(sig, module, str);

        str = RTLIL::escape_id(str.substr(1));
        if (design->selection_vars.count(str) == 0)
                return false;

        sig = RTLIL::SigSpec();
        RTLIL::Selection &sel = design->selection_vars.at(str);
        for (auto &it : module->wires)
                if (sel.selected_member(module->name, it.first))
                        sig.append(it.second);

        return true;
}

bool RTLIL::SigSpec::parse_rhs(const RTLIL::SigSpec &lhs, RTLIL::SigSpec &sig, RTLIL::Module *module, std::string str)
{
        if (str == "0") {
                sig = RTLIL::SigSpec(RTLIL::State::S0, lhs.width_);
                return true;
        }

        if (str == "~0") {
                sig = RTLIL::SigSpec(RTLIL::State::S1, lhs.width_);
                return true;
        }

        if (lhs.chunks_.size() == 1) {
                char *p = (char*)str.c_str(), *endptr;
                long long int val = strtoll(p, &endptr, 10);
                if (endptr && endptr != p && *endptr == 0) {
                        sig = RTLIL::SigSpec(val, lhs.width_);
                        return true;
                }
        }

        return parse(sig, module, str);
}

RTLIL::CaseRule::~CaseRule()
{
        for (auto it = switches.begin(); it != switches.end(); it++)
                delete *it;
}

RTLIL::CaseRule *RTLIL::CaseRule::clone() const
{
        RTLIL::CaseRule *new_caserule = new RTLIL::CaseRule;
        new_caserule->compare = compare;
        new_caserule->actions = actions;
        for (auto &it : switches)
                new_caserule->switches.push_back(it->clone());
        return new_caserule;
}

RTLIL::SwitchRule::~SwitchRule()
{
        for (auto it = cases.begin(); it != cases.end(); it++)
                delete *it;
}

RTLIL::SwitchRule *RTLIL::SwitchRule::clone() const
{
        RTLIL::SwitchRule *new_switchrule = new RTLIL::SwitchRule;
        new_switchrule->signal = signal;
        new_switchrule->attributes = attributes;
        for (auto &it : cases)
                new_switchrule->cases.push_back(it->clone());
        return new_switchrule;
        
}

RTLIL::SyncRule *RTLIL::SyncRule::clone() const
{
        RTLIL::SyncRule *new_syncrule = new RTLIL::SyncRule;
        new_syncrule->type = type;
        new_syncrule->signal = signal;
        new_syncrule->actions = actions;
        return new_syncrule;
}

RTLIL::Process::~Process()
{
        for (auto it = syncs.begin(); it != syncs.end(); it++)
                delete *it;
}

RTLIL::Process *RTLIL::Process::clone() const
{
        RTLIL::Process *new_proc = new RTLIL::Process;

        new_proc->name = name;
        new_proc->attributes = attributes;

        RTLIL::CaseRule *rc_ptr = root_case.clone();
        new_proc->root_case = *rc_ptr;
        rc_ptr->switches.clear();
        delete rc_ptr;

        for (auto &it : syncs)
                new_proc->syncs.push_back(it->clone());
        
        return new_proc;
}