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btor.cc
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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Claire Xenia Wolf <[email protected]>
*
* 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.
*
*/
// [[CITE]] Btor2 , BtorMC and Boolector 3.0
// Aina Niemetz, Mathias Preiner, C. Wolf, Armin Biere
// Computer Aided Verification - 30th International Conference, CAV 2018
// https://cs.stanford.edu/people/niemetz/publication/2018/niemetzpreinerwolfbiere-cav18/
#include "kernel/rtlil.h"
#include "kernel/register.h"
#include "kernel/sigtools.h"
#include "kernel/celltypes.h"
#include "kernel/log.h"
#include "kernel/mem.h"
#include "kernel/json.h"
#include "kernel/yw.h"
#include "kernel/utils.h"
#include <string>
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
struct BtorWorker
{
std::ostream &f;
SigMap sigmap;
RTLIL::Module *module;
bool verbose;
bool single_bad;
bool cover_mode;
bool print_internal_names;
int next_nid = 1;
int initstate_nid = -1;
// <width> => <sid>
dict<int, int> sorts_bv;
// (<address-width>, <data-width>) => <sid>
dict<pair<int, int>, int> sorts_mem;
// SigBit => (<nid>, <bitidx>)
dict<SigBit, pair<int, int>> bit_nid;
// <nid> => <bvwidth>
dict<int, int> nid_width;
// SigSpec => <nid>
dict<SigSpec, int> sig_nid;
// bit to driving cell
dict<SigBit, Cell*> bit_cell;
// nids for constants
dict<Const, int> consts;
// ff inputs that need to be evaluated (<nid>, <ff_cell>)
vector<pair<int, Cell*>> ff_todo;
vector<pair<int, Mem*>> mem_todo;
pool<Cell*> cell_recursion_guard;
vector<int> bad_properties;
dict<SigBit, bool> initbits;
pool<Wire*> statewires;
pool<string> srcsymbols;
vector<Mem> memories;
dict<Cell*, Mem*> mem_cells;
string indent, info_filename;
vector<string> info_lines;
dict<int, int> info_clocks;
struct ywmap_btor_sig {
SigSpec sig;
Cell *cell = nullptr;
ywmap_btor_sig(const SigSpec &sig) : sig(sig) {}
ywmap_btor_sig(Cell *cell) : cell(cell) {}
};
vector<ywmap_btor_sig> ywmap_inputs;
vector<ywmap_btor_sig> ywmap_states;
dict<SigBit, int> ywmap_clock_bits;
dict<SigBit, int> ywmap_clock_inputs;
PrettyJson ywmap_json;
void btorf(const char *fmt, ...) YS_ATTRIBUTE(format(printf, 2, 3))
{
va_list ap;
va_start(ap, fmt);
f << indent << vstringf(fmt, ap);
va_end(ap);
}
void infof(const char *fmt, ...) YS_ATTRIBUTE(format(printf, 2, 3))
{
va_list ap;
va_start(ap, fmt);
info_lines.push_back(vstringf(fmt, ap));
va_end(ap);
}
template<typename T>
string getinfo(T *obj, bool srcsym = false)
{
string infostr = log_id(obj);
if (!srcsym && !print_internal_names && infostr[0] == '$') return "";
if (obj->attributes.count(ID::src)) {
string src = obj->attributes.at(ID::src).decode_string().c_str();
if (srcsym && infostr[0] == '$') {
std::replace(src.begin(), src.end(), ' ', '_');
if (srcsymbols.count(src) || module->count_id("\\" + src)) {
for (int i = 1;; i++) {
string s = stringf("%s-%d", src.c_str(), i);
if (!srcsymbols.count(s) && !module->count_id("\\" + s)) {
src = s;
break;
}
}
}
srcsymbols.insert(src);
infostr = src;
} else {
infostr += " ; " + src;
}
}
return " " + infostr;
}
void ywmap_state(const SigSpec &sig) {
if (ywmap_json.active())
ywmap_states.emplace_back(sig);
}
void ywmap_state(Cell *cell) {
if (ywmap_json.active())
ywmap_states.emplace_back(cell);
}
void ywmap_input(const SigSpec &sig) {
if (ywmap_json.active())
ywmap_inputs.emplace_back(sig);
}
void emit_ywmap_btor_sig(const ywmap_btor_sig &btor_sig) {
if (btor_sig.cell == nullptr) {
if (btor_sig.sig.empty()) {
ywmap_json.value(nullptr);
return;
}
ywmap_json.begin_array();
ywmap_json.compact();
for (auto &chunk : btor_sig.sig.chunks()) {
log_assert(chunk.is_wire());
ywmap_json.begin_object();
ywmap_json.entry("path", witness_path(chunk.wire));
ywmap_json.entry("width", chunk.width);
ywmap_json.entry("offset", chunk.offset);
ywmap_json.end_object();
}
ywmap_json.end_array();
} else {
ywmap_json.begin_object();
ywmap_json.compact();
ywmap_json.entry("path", witness_path(btor_sig.cell));
Mem *mem = mem_cells[btor_sig.cell];
ywmap_json.entry("width", mem->width);
ywmap_json.entry("size", mem->size);
ywmap_json.end_object();
}
}
void btorf_push(const string &id)
{
if (verbose) {
f << indent << stringf(" ; begin %s\n", id.c_str());
indent += " ";
}
}
void btorf_pop(const string &id)
{
if (verbose) {
indent = indent.substr(4);
f << indent << stringf(" ; end %s\n", id.c_str());
}
}
int get_bv_sid(int width)
{
if (sorts_bv.count(width) == 0) {
int nid = next_nid++;
btorf("%d sort bitvec %d\n", nid, width);
sorts_bv[width] = nid;
}
return sorts_bv.at(width);
}
int get_mem_sid(int abits, int dbits)
{
pair<int, int> key(abits, dbits);
if (sorts_mem.count(key) == 0) {
int addr_sid = get_bv_sid(abits);
int data_sid = get_bv_sid(dbits);
int nid = next_nid++;
btorf("%d sort array %d %d\n", nid, addr_sid, data_sid);
sorts_mem[key] = nid;
}
return sorts_mem.at(key);
}
void add_nid_sig(int nid, const SigSpec &sig)
{
if (verbose)
f << indent << stringf("; %d %s\n", nid, log_signal(sig));
for (int i = 0; i < GetSize(sig); i++)
bit_nid[sig[i]] = make_pair(nid, i);
sig_nid[sig] = nid;
nid_width[nid] = GetSize(sig);
}
void export_cell(Cell *cell)
{
if (cell_recursion_guard.count(cell)) {
string cell_list;
for (auto c : cell_recursion_guard)
cell_list += stringf("\n %s", log_id(c));
log_error("Found topological loop while processing cell %s. Active cells:%s\n", log_id(cell), cell_list.c_str());
}
cell_recursion_guard.insert(cell);
btorf_push(log_id(cell));
if (cell->type.in(ID($add), ID($sub), ID($mul), ID($and), ID($or), ID($xor), ID($xnor), ID($shl), ID($sshl), ID($shr), ID($sshr), ID($shift), ID($shiftx),
ID($concat), ID($_AND_), ID($_NAND_), ID($_OR_), ID($_NOR_), ID($_XOR_), ID($_XNOR_)))
{
string btor_op;
if (cell->type == ID($add)) btor_op = "add";
if (cell->type == ID($sub)) btor_op = "sub";
if (cell->type == ID($mul)) btor_op = "mul";
if (cell->type.in(ID($shl), ID($sshl))) btor_op = "sll";
if (cell->type == ID($shr)) btor_op = "srl";
if (cell->type == ID($sshr)) btor_op = "sra";
if (cell->type.in(ID($shift), ID($shiftx))) btor_op = "shift";
if (cell->type.in(ID($and), ID($_AND_))) btor_op = "and";
if (cell->type.in(ID($or), ID($_OR_))) btor_op = "or";
if (cell->type.in(ID($xor), ID($_XOR_))) btor_op = "xor";
if (cell->type == ID($concat)) btor_op = "concat";
if (cell->type == ID($_NAND_)) btor_op = "nand";
if (cell->type == ID($_NOR_)) btor_op = "nor";
if (cell->type.in(ID($xnor), ID($_XNOR_))) btor_op = "xnor";
log_assert(!btor_op.empty());
int width_ay = std::max(GetSize(cell->getPort(ID::A)), GetSize(cell->getPort(ID::Y)));
int width = std::max(width_ay, GetSize(cell->getPort(ID::B)));
bool a_signed = cell->hasParam(ID::A_SIGNED) ? cell->getParam(ID::A_SIGNED).as_bool() : false;
bool b_signed = cell->hasParam(ID::B_SIGNED) ? cell->getParam(ID::B_SIGNED).as_bool() : false;
if (btor_op == "shift" && !b_signed)
btor_op = "srl";
if (cell->type.in(ID($shl), ID($sshl), ID($shr), ID($sshr)))
b_signed = false;
if (cell->type == ID($sshr) && !a_signed)
btor_op = "srl";
int sid = get_bv_sid(width);
int nid;
int nid_a;
if (cell->type.in(ID($shl), ID($shr), ID($shift), ID($shiftx)) && a_signed && width_ay < width) {
// sign-extend A up to the width of Y
int nid_a_padded = get_sig_nid(cell->getPort(ID::A), width_ay, a_signed);
// zero-extend the rest
int zeroes = get_sig_nid(Const(0, width-width_ay));
nid_a = next_nid++;
btorf("%d concat %d %d %d\n", nid_a, sid, zeroes, nid_a_padded);
} else {
nid_a = get_sig_nid(cell->getPort(ID::A), width, a_signed);
}
int nid_b = get_sig_nid(cell->getPort(ID::B), width, b_signed);
if (btor_op == "shift")
{
int nid_r = next_nid++;
btorf("%d srl %d %d %d\n", nid_r, sid, nid_a, nid_b);
int nid_b_neg = next_nid++;
btorf("%d neg %d %d\n", nid_b_neg, sid, nid_b);
int nid_l = next_nid++;
btorf("%d sll %d %d %d\n", nid_l, sid, nid_a, nid_b_neg);
int sid_bit = get_bv_sid(1);
int nid_zero = get_sig_nid(Const(0, width));
int nid_b_ltz = next_nid++;
btorf("%d slt %d %d %d\n", nid_b_ltz, sid_bit, nid_b, nid_zero);
nid = next_nid++;
btorf("%d ite %d %d %d %d%s\n", nid, sid, nid_b_ltz, nid_l, nid_r, getinfo(cell).c_str());
}
else
{
nid = next_nid++;
btorf("%d %s %d %d %d%s\n", nid, btor_op.c_str(), sid, nid_a, nid_b, getinfo(cell).c_str());
}
SigSpec sig = sigmap(cell->getPort(ID::Y));
if (GetSize(sig) < width) {
int sid = get_bv_sid(GetSize(sig));
int nid2 = next_nid++;
btorf("%d slice %d %d %d 0\n", nid2, sid, nid, GetSize(sig)-1);
nid = nid2;
}
add_nid_sig(nid, sig);
goto okay;
}
if (cell->type.in(ID($div), ID($mod), ID($modfloor)))
{
bool a_signed = cell->hasParam(ID::A_SIGNED) ? cell->getParam(ID::A_SIGNED).as_bool() : false;
bool b_signed = cell->hasParam(ID::B_SIGNED) ? cell->getParam(ID::B_SIGNED).as_bool() : false;
string btor_op;
if (cell->type == ID($div)) btor_op = "div";
// "rem" = truncating modulo
if (cell->type == ID($mod)) btor_op = "rem";
// "mod" = flooring modulo
if (cell->type == ID($modfloor)) {
// "umod" doesn't exist because it's the same as "urem"
btor_op = a_signed || b_signed ? "mod" : "rem";
}
log_assert(!btor_op.empty());
int width = GetSize(cell->getPort(ID::Y));
width = std::max(width, GetSize(cell->getPort(ID::A)));
width = std::max(width, GetSize(cell->getPort(ID::B)));
int nid_a = get_sig_nid(cell->getPort(ID::A), width, a_signed);
int nid_b = get_sig_nid(cell->getPort(ID::B), width, b_signed);
int sid = get_bv_sid(width);
int nid = next_nid++;
btorf("%d %c%s %d %d %d%s\n", nid, a_signed || b_signed ? 's' : 'u', btor_op.c_str(), sid, nid_a, nid_b, getinfo(cell).c_str());
SigSpec sig = sigmap(cell->getPort(ID::Y));
if (GetSize(sig) < width) {
int sid = get_bv_sid(GetSize(sig));
int nid2 = next_nid++;
btorf("%d slice %d %d %d 0\n", nid2, sid, nid, GetSize(sig)-1);
nid = nid2;
}
add_nid_sig(nid, sig);
goto okay;
}
if (cell->type.in(ID($_ANDNOT_), ID($_ORNOT_)))
{
int sid = get_bv_sid(1);
int nid_a = get_sig_nid(cell->getPort(ID::A));
int nid_b = get_sig_nid(cell->getPort(ID::B));
int nid1 = next_nid++;
int nid2 = next_nid++;
if (cell->type == ID($_ANDNOT_)) {
btorf("%d not %d %d\n", nid1, sid, nid_b);
btorf("%d and %d %d %d%s\n", nid2, sid, nid_a, nid1, getinfo(cell).c_str());
}
if (cell->type == ID($_ORNOT_)) {
btorf("%d not %d %d\n", nid1, sid, nid_b);
btorf("%d or %d %d %d%s\n", nid2, sid, nid_a, nid1, getinfo(cell).c_str());
}
SigSpec sig = sigmap(cell->getPort(ID::Y));
add_nid_sig(nid2, sig);
goto okay;
}
if (cell->type.in(ID($_OAI3_), ID($_AOI3_)))
{
int sid = get_bv_sid(1);
int nid_a = get_sig_nid(cell->getPort(ID::A));
int nid_b = get_sig_nid(cell->getPort(ID::B));
int nid_c = get_sig_nid(cell->getPort(ID::C));
int nid1 = next_nid++;
int nid2 = next_nid++;
int nid3 = next_nid++;
if (cell->type == ID($_OAI3_)) {
btorf("%d or %d %d %d\n", nid1, sid, nid_a, nid_b);
btorf("%d and %d %d %d\n", nid2, sid, nid1, nid_c);
btorf("%d not %d %d%s\n", nid3, sid, nid2, getinfo(cell).c_str());
}
if (cell->type == ID($_AOI3_)) {
btorf("%d and %d %d %d\n", nid1, sid, nid_a, nid_b);
btorf("%d or %d %d %d\n", nid2, sid, nid1, nid_c);
btorf("%d not %d %d%s\n", nid3, sid, nid2, getinfo(cell).c_str());
}
SigSpec sig = sigmap(cell->getPort(ID::Y));
add_nid_sig(nid3, sig);
goto okay;
}
if (cell->type.in(ID($_OAI4_), ID($_AOI4_)))
{
int sid = get_bv_sid(1);
int nid_a = get_sig_nid(cell->getPort(ID::A));
int nid_b = get_sig_nid(cell->getPort(ID::B));
int nid_c = get_sig_nid(cell->getPort(ID::C));
int nid_d = get_sig_nid(cell->getPort(ID::D));
int nid1 = next_nid++;
int nid2 = next_nid++;
int nid3 = next_nid++;
int nid4 = next_nid++;
if (cell->type == ID($_OAI4_)) {
btorf("%d or %d %d %d\n", nid1, sid, nid_a, nid_b);
btorf("%d or %d %d %d\n", nid2, sid, nid_c, nid_d);
btorf("%d and %d %d %d\n", nid3, sid, nid1, nid2);
btorf("%d not %d %d%s\n", nid4, sid, nid3, getinfo(cell).c_str());
}
if (cell->type == ID($_AOI4_)) {
btorf("%d and %d %d %d\n", nid1, sid, nid_a, nid_b);
btorf("%d and %d %d %d\n", nid2, sid, nid_c, nid_d);
btorf("%d or %d %d %d\n", nid3, sid, nid1, nid2);
btorf("%d not %d %d%s\n", nid4, sid, nid3, getinfo(cell).c_str());
}
SigSpec sig = sigmap(cell->getPort(ID::Y));
add_nid_sig(nid4, sig);
goto okay;
}
if (cell->type.in(ID($lt), ID($le), ID($eq), ID($eqx), ID($ne), ID($nex), ID($ge), ID($gt)))
{
string btor_op;
if (cell->type == ID($lt)) btor_op = "lt";
if (cell->type == ID($le)) btor_op = "lte";
if (cell->type.in(ID($eq), ID($eqx))) btor_op = "eq";
if (cell->type.in(ID($ne), ID($nex))) btor_op = "neq";
if (cell->type == ID($ge)) btor_op = "gte";
if (cell->type == ID($gt)) btor_op = "gt";
log_assert(!btor_op.empty());
int width = 1;
width = std::max(width, GetSize(cell->getPort(ID::A)));
width = std::max(width, GetSize(cell->getPort(ID::B)));
bool a_signed = cell->hasParam(ID::A_SIGNED) ? cell->getParam(ID::A_SIGNED).as_bool() : false;
bool b_signed = cell->hasParam(ID::B_SIGNED) ? cell->getParam(ID::B_SIGNED).as_bool() : false;
int sid = get_bv_sid(1);
int nid_a = get_sig_nid(cell->getPort(ID::A), width, a_signed);
int nid_b = get_sig_nid(cell->getPort(ID::B), width, b_signed);
int nid = next_nid++;
if (cell->type.in(ID($lt), ID($le), ID($ge), ID($gt))) {
btorf("%d %c%s %d %d %d%s\n", nid, a_signed || b_signed ? 's' : 'u', btor_op.c_str(), sid, nid_a, nid_b, getinfo(cell).c_str());
} else {
btorf("%d %s %d %d %d%s\n", nid, btor_op.c_str(), sid, nid_a, nid_b, getinfo(cell).c_str());
}
SigSpec sig = sigmap(cell->getPort(ID::Y));
if (GetSize(sig) > 1) {
int sid = get_bv_sid(GetSize(sig));
int nid2 = next_nid++;
btorf("%d uext %d %d %d\n", nid2, sid, nid, GetSize(sig) - 1);
nid = nid2;
}
add_nid_sig(nid, sig);
goto okay;
}
if (cell->type.in(ID($not), ID($neg), ID($_NOT_), ID($pos)))
{
string btor_op;
if (cell->type.in(ID($not), ID($_NOT_))) btor_op = "not";
if (cell->type == ID($neg)) btor_op = "neg";
int width = std::max(GetSize(cell->getPort(ID::A)), GetSize(cell->getPort(ID::Y)));
bool a_signed = cell->hasParam(ID::A_SIGNED) ? cell->getParam(ID::A_SIGNED).as_bool() : false;
int nid_a = get_sig_nid(cell->getPort(ID::A), width, a_signed);
SigSpec sig = sigmap(cell->getPort(ID::Y));
// the $pos cell just passes through, all other cells need an actual operation applied
int nid = nid_a;
if (cell->type != ID($pos))
{
log_assert(!btor_op.empty());
int sid = get_bv_sid(width);
nid = next_nid++;
btorf("%d %s %d %d%s\n", nid, btor_op.c_str(), sid, nid_a, getinfo(cell).c_str());
}
if (GetSize(sig) < width) {
int sid = get_bv_sid(GetSize(sig));
int nid2 = next_nid++;
btorf("%d slice %d %d %d 0\n", nid2, sid, nid, GetSize(sig)-1);
nid = nid2;
}
add_nid_sig(nid, sig);
goto okay;
}
if (cell->type.in(ID($logic_and), ID($logic_or), ID($logic_not)))
{
string btor_op;
if (cell->type == ID($logic_and)) btor_op = "and";
if (cell->type == ID($logic_or)) btor_op = "or";
if (cell->type == ID($logic_not)) btor_op = "not";
log_assert(!btor_op.empty());
int sid = get_bv_sid(1);
int nid_a = get_sig_nid(cell->getPort(ID::A));
int nid_b = btor_op != "not" ? get_sig_nid(cell->getPort(ID::B)) : 0;
if (GetSize(cell->getPort(ID::A)) > 1) {
int nid_red_a = next_nid++;
btorf("%d redor %d %d\n", nid_red_a, sid, nid_a);
nid_a = nid_red_a;
}
if (btor_op != "not" && GetSize(cell->getPort(ID::B)) > 1) {
int nid_red_b = next_nid++;
btorf("%d redor %d %d\n", nid_red_b, sid, nid_b);
nid_b = nid_red_b;
}
int nid = next_nid++;
if (btor_op != "not")
btorf("%d %s %d %d %d%s\n", nid, btor_op.c_str(), sid, nid_a, nid_b, getinfo(cell).c_str());
else
btorf("%d %s %d %d%s\n", nid, btor_op.c_str(), sid, nid_a, getinfo(cell).c_str());
SigSpec sig = sigmap(cell->getPort(ID::Y));
if (GetSize(sig) > 1) {
int sid = get_bv_sid(GetSize(sig));
int zeros_nid = get_sig_nid(Const(0, GetSize(sig)-1));
int nid2 = next_nid++;
btorf("%d concat %d %d %d\n", nid2, sid, zeros_nid, nid);
nid = nid2;
}
add_nid_sig(nid, sig);
goto okay;
}
if (cell->type.in(ID($reduce_and), ID($reduce_or), ID($reduce_bool), ID($reduce_xor), ID($reduce_xnor)))
{
string btor_op;
if (cell->type == ID($reduce_and)) btor_op = "redand";
if (cell->type.in(ID($reduce_or), ID($reduce_bool))) btor_op = "redor";
if (cell->type.in(ID($reduce_xor), ID($reduce_xnor))) btor_op = "redxor";
log_assert(!btor_op.empty());
int sid = get_bv_sid(1);
int nid_a = get_sig_nid(cell->getPort(ID::A));
int nid = next_nid++;
if (cell->type == ID($reduce_xnor)) {
int nid2 = next_nid++;
btorf("%d %s %d %d%s\n", nid, btor_op.c_str(), sid, nid_a, getinfo(cell).c_str());
btorf("%d not %d %d\n", nid2, sid, nid);
nid = nid2;
} else {
btorf("%d %s %d %d%s\n", nid, btor_op.c_str(), sid, nid_a, getinfo(cell).c_str());
}
SigSpec sig = sigmap(cell->getPort(ID::Y));
if (GetSize(sig) > 1) {
int sid = get_bv_sid(GetSize(sig));
int zeros_nid = get_sig_nid(Const(0, GetSize(sig)-1));
int nid2 = next_nid++;
btorf("%d concat %d %d %d\n", nid2, sid, zeros_nid, nid);
nid = nid2;
}
add_nid_sig(nid, sig);
goto okay;
}
if (cell->type.in(ID($mux), ID($_MUX_), ID($_NMUX_)))
{
SigSpec sig_a = sigmap(cell->getPort(ID::A));
SigSpec sig_b = sigmap(cell->getPort(ID::B));
SigSpec sig_s = sigmap(cell->getPort(ID::S));
SigSpec sig_y = sigmap(cell->getPort(ID::Y));
int nid_a = get_sig_nid(sig_a);
int nid_b = get_sig_nid(sig_b);
int nid_s = get_sig_nid(sig_s);
int sid = get_bv_sid(GetSize(sig_y));
int nid = next_nid++;
if (cell->type == ID($_NMUX_)) {
int tmp = nid;
nid = next_nid++;
btorf("%d ite %d %d %d %d\n", tmp, sid, nid_s, nid_b, nid_a);
btorf("%d not %d %d%s\n", nid, sid, tmp, getinfo(cell).c_str());
} else {
btorf("%d ite %d %d %d %d%s\n", nid, sid, nid_s, nid_b, nid_a, getinfo(cell).c_str());
}
add_nid_sig(nid, sig_y);
goto okay;
}
if (cell->type == ID($pmux))
{
SigSpec sig_a = sigmap(cell->getPort(ID::A));
SigSpec sig_b = sigmap(cell->getPort(ID::B));
SigSpec sig_s = sigmap(cell->getPort(ID::S));
SigSpec sig_y = sigmap(cell->getPort(ID::Y));
int width = GetSize(sig_a);
int sid = get_bv_sid(width);
int nid = get_sig_nid(sig_a);
for (int i = 0; i < GetSize(sig_s); i++) {
int nid_b = get_sig_nid(sig_b.extract(i*width, width));
int nid_s = get_sig_nid(sig_s.extract(i));
int nid2 = next_nid++;
if (i == GetSize(sig_s)-1)
btorf("%d ite %d %d %d %d%s\n", nid2, sid, nid_s, nid_b, nid, getinfo(cell).c_str());
else
btorf("%d ite %d %d %d %d\n", nid2, sid, nid_s, nid_b, nid);
nid = nid2;
}
add_nid_sig(nid, sig_y);
goto okay;
}
if (cell->type.in(ID($dff), ID($ff), ID($anyinit), ID($_DFF_P_), ID($_DFF_N), ID($_FF_)))
{
SigSpec sig_d = sigmap(cell->getPort(ID::D));
SigSpec sig_q = sigmap(cell->getPort(ID::Q));
if ((!info_filename.empty() || ywmap_json.active()) && cell->type.in(ID($dff), ID($_DFF_P_), ID($_DFF_N_)))
{
SigSpec sig_c = sigmap(cell->getPort(cell->type == ID($dff) ? ID::CLK : ID::C));
int nid = get_sig_nid(sig_c);
bool negedge = false;
if (cell->type == ID($_DFF_N_))
negedge = true;
if (cell->type == ID($dff) && !cell->getParam(ID::CLK_POLARITY).as_bool())
negedge = true;
if (!info_filename.empty())
info_clocks[nid] |= negedge ? 2 : 1;
if (ywmap_json.active())
ywmap_clock_bits[sig_c] |= negedge ? 2 : 1;
}
IdString symbol;
if (sig_q.is_wire()) {
Wire *w = sig_q.as_wire();
if (w->port_id == 0) {
statewires.insert(w);
symbol = w->name;
}
}
Const initval;
for (int i = 0; i < GetSize(sig_q); i++)
if (initbits.count(sig_q[i]))
initval.bits().push_back(initbits.at(sig_q[i]) ? State::S1 : State::S0);
else
initval.bits().push_back(State::Sx);
int nid_init_val = -1;
if (!initval.is_fully_undef())
nid_init_val = get_sig_nid(initval, -1, false, true);
int sid = get_bv_sid(GetSize(sig_q));
int nid = next_nid++;
if (symbol.empty() || (!print_internal_names && symbol[0] == '$'))
btorf("%d state %d\n", nid, sid);
else
btorf("%d state %d %s\n", nid, sid, log_id(symbol));
if (cell->get_bool_attribute(ID(clk2fflogic)))
ywmap_state(cell->getPort(ID::D)); // For a clk2fflogic FF the named signal is the D input not the Q output
else
ywmap_state(sig_q);
if (nid_init_val >= 0) {
int nid_init = next_nid++;
if (verbose)
btorf("; initval = %s\n", log_signal(initval));
btorf("%d init %d %d %d\n", nid_init, sid, nid, nid_init_val);
}
ff_todo.push_back(make_pair(nid, cell));
add_nid_sig(nid, sig_q);
goto okay;
}
if (cell->type.in(ID($anyconst), ID($anyseq)))
{
SigSpec sig_y = sigmap(cell->getPort(ID::Y));
int sid = get_bv_sid(GetSize(sig_y));
int nid = next_nid++;
btorf("%d state %d%s\n", nid, sid, getinfo(cell).c_str());
ywmap_state(sig_y);
if (cell->type == ID($anyconst)) {
int nid2 = next_nid++;
btorf("%d next %d %d %d\n", nid2, sid, nid, nid);
}
add_nid_sig(nid, sig_y);
goto okay;
}
if (cell->type == ID($initstate))
{
SigSpec sig_y = sigmap(cell->getPort(ID::Y));
if (initstate_nid < 0)
{
int sid = get_bv_sid(1);
int one_nid = get_sig_nid(State::S1);
int zero_nid = get_sig_nid(State::S0);
initstate_nid = next_nid++;
btorf("%d state %d%s\n", initstate_nid, sid, getinfo(cell).c_str());
btorf("%d init %d %d %d\n", next_nid++, sid, initstate_nid, one_nid);
btorf("%d next %d %d %d\n", next_nid++, sid, initstate_nid, zero_nid);
ywmap_state(sig_y);
}
add_nid_sig(initstate_nid, sig_y);
goto okay;
}
if (cell->is_mem_cell())
{
Mem *mem = mem_cells[cell];
int abits = ceil_log2(mem->size);
bool asyncwr = false;
bool syncwr = false;
for (auto &port : mem->wr_ports) {
if (port.clk_enable)
syncwr = true;
else
asyncwr = true;
}
if (asyncwr && syncwr)
log_error("Memory %s.%s has mixed async/sync write ports.\n",
log_id(module), log_id(mem->memid));
for (auto &port : mem->rd_ports) {
if (port.clk_enable)
log_error("Memory %s.%s has sync read ports. Please use memory_nordff to convert them first.\n",
log_id(module), log_id(mem->memid));
}
int data_sid = get_bv_sid(mem->width);
int bool_sid = get_bv_sid(1);
int sid = get_mem_sid(abits, mem->width);
int nid_init_val = -1;
if (!mem->inits.empty())
{
Const initdata = mem->get_init_data();
bool constword = true;
Const firstword = initdata.extract(0, mem->width);
for (int i = 1; i < mem->size; i++) {
Const thisword = initdata.extract(i*mem->width, mem->width);
if (thisword != firstword) {
constword = false;
break;
}
}
// If not fully defined, undef bits should be able to take a
// different value for each address so we can't initialise from
// one value (and btor2parser doesn't like it)
if (constword && firstword.is_fully_def())
{
if (verbose)
btorf("; initval = %s\n", log_signal(firstword));
nid_init_val = get_sig_nid(firstword, -1, false, true);
}
else
{
nid_init_val = next_nid++;
btorf("%d state %d\n", nid_init_val, sid);
ywmap_state(nullptr);
for (int i = 0; i < mem->size; i++) {
Const thisword = initdata.extract(i*mem->width, mem->width);
if (thisword.is_fully_undef())
continue;
Const thisaddr(i, abits);
int nid_thisword = get_sig_nid(thisword, -1, false, true);
int nid_thisaddr = get_sig_nid(thisaddr, -1, false, true);
int last_nid_init_val = nid_init_val;
nid_init_val = next_nid++;
if (verbose)
btorf("; initval[%d] = %s\n", i, log_signal(thisword));
btorf("%d write %d %d %d %d\n", nid_init_val, sid, last_nid_init_val, nid_thisaddr, nid_thisword);
}
}
}
int nid = next_nid++;
int nid_head = nid;
if (mem->memid[0] == '$')
btorf("%d state %d\n", nid, sid);
else
btorf("%d state %d %s\n", nid, sid, log_id(mem->memid));
ywmap_state(cell);
if (nid_init_val >= 0)
{
int nid_init = next_nid++;
btorf("%d init %d %d %d\n", nid_init, sid, nid, nid_init_val);
}
if (asyncwr)
{
for (auto &port : mem->wr_ports)
{
SigSpec wa = port.addr;
wa.extend_u0(abits);
int wa_nid = get_sig_nid(wa);
int wd_nid = get_sig_nid(port.data);
int we_nid = get_sig_nid(port.en);
int nid2 = next_nid++;
btorf("%d read %d %d %d\n", nid2, data_sid, nid_head, wa_nid);
int nid3 = next_nid++;
btorf("%d not %d %d\n", nid3, data_sid, we_nid);
int nid4 = next_nid++;
btorf("%d and %d %d %d\n", nid4, data_sid, nid2, nid3);
int nid5 = next_nid++;
btorf("%d and %d %d %d\n", nid5, data_sid, wd_nid, we_nid);
int nid6 = next_nid++;
btorf("%d or %d %d %d\n", nid6, data_sid, nid5, nid4);
int nid7 = next_nid++;
btorf("%d write %d %d %d %d\n", nid7, sid, nid_head, wa_nid, nid6);
int nid8 = next_nid++;
btorf("%d redor %d %d\n", nid8, bool_sid, we_nid);
int nid9 = next_nid++;
btorf("%d ite %d %d %d %d\n", nid9, sid, nid8, nid7, nid_head);
nid_head = nid9;
}
}
for (auto &port : mem->rd_ports)
{
SigSpec ra = port.addr;
ra.extend_u0(abits);
int ra_nid = get_sig_nid(ra);
int rd_nid = next_nid++;
btorf("%d read %d %d %d\n", rd_nid, data_sid, nid_head, ra_nid);
add_nid_sig(rd_nid, port.data);
}
if (!asyncwr)
{
mem_todo.push_back(make_pair(nid, mem));
}
else
{
int nid2 = next_nid++;
btorf("%d next %d %d %d\n", nid2, sid, nid, nid_head);
}
goto okay;
}
if (cell->type.in(ID($dffe), ID($sdff), ID($sdffe), ID($sdffce)) || cell->type.str().substr(0, 6) == "$_SDFF" || (cell->type.str().substr(0, 6) == "$_DFFE" && cell->type.str().size() == 10)) {
log_error("Unsupported cell type %s for cell %s.%s -- please run `dffunmap` before `write_btor`.\n",
log_id(cell->type), log_id(module), log_id(cell));
}
if (cell->type.in(ID($adff), ID($adffe), ID($aldff), ID($aldffe), ID($dffsr), ID($dffsre)) || cell->type.str().substr(0, 5) == "$_DFF" || cell->type.str().substr(0, 7) == "$_ALDFF") {
log_error("Unsupported cell type %s for cell %s.%s -- please run `async2sync; dffunmap` or `clk2fflogic` before `write_btor`.\n",
log_id(cell->type), log_id(module), log_id(cell));
}
if (cell->type.in(ID($sr), ID($dlatch), ID($adlatch), ID($dlatchsr)) || cell->type.str().substr(0, 8) == "$_DLATCH" || cell->type.str().substr(0, 5) == "$_SR_") {
log_error("Unsupported cell type %s for cell %s.%s -- please run `clk2fflogic` before `write_btor`.\n",
log_id(cell->type), log_id(module), log_id(cell));
}
log_error("Unsupported cell type %s for cell %s.%s.\n",
log_id(cell->type), log_id(module), log_id(cell));
okay:
btorf_pop(log_id(cell));
cell_recursion_guard.erase(cell);
}
int get_sig_nid(SigSpec sig, int to_width = -1, bool is_signed = false, bool is_init = false)
{
int nid = -1;
sigmap.apply(sig);
for (auto bit : sig)
if (bit == State::Sx)
goto has_undef_bits;
if (0)
{
has_undef_bits:
SigSpec sig_mask_undef, sig_noundef;
int first_undef = -1;
for (int i = 0; i < GetSize(sig); i++)
if (sig[i] == State::Sx) {
if (first_undef < 0)
first_undef = i;
sig_mask_undef.append(State::S1);
sig_noundef.append(State::S0);
} else {
sig_mask_undef.append(State::S0);
sig_noundef.append(sig[i]);
}
if (to_width < 0 || first_undef < to_width)
{
int sid = get_bv_sid(GetSize(sig));
int nid_input = next_nid++;