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-rw-r--r--backends/btor/btor.cc158
1 files changed, 140 insertions, 18 deletions
diff --git a/backends/btor/btor.cc b/backends/btor/btor.cc
index 58d2a862..a507b120 100644
--- a/backends/btor/btor.cc
+++ b/backends/btor/btor.cc
@@ -17,6 +17,11 @@
*
*/
+// [[CITE]] Btor2 , BtorMC and Boolector 3.0
+// Aina Niemetz, Mathias Preiner, Clifford 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"
@@ -129,16 +134,23 @@ struct BtorWorker
void export_cell(Cell *cell)
{
- log_assert(cell_recursion_guard.count(cell) == 0);
+ 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("$add", "$sub", "$and", "$or", "$xor", "$xnor", "$shl", "$sshl", "$shr", "$sshr", "$shift", "$shiftx",
- "$_AND_", "$_NAND_", "$_OR_", "$_NOR_", "$_XOR_", "$_XNOR_"))
+ if (cell->type.in("$add", "$sub", "$mul", "$and", "$or", "$xor", "$xnor", "$shl", "$sshl", "$shr", "$sshr", "$shift", "$shiftx",
+ "$concat", "$_AND_", "$_NAND_", "$_OR_", "$_NOR_", "$_XOR_", "$_XNOR_"))
{
string btor_op;
if (cell->type == "$add") btor_op = "add";
if (cell->type == "$sub") btor_op = "sub";
+ if (cell->type == "$mul") btor_op = "mul";
if (cell->type.in("$shl", "$sshl")) btor_op = "sll";
if (cell->type == "$shr") btor_op = "srl";
if (cell->type == "$sshr") btor_op = "sra";
@@ -146,6 +158,7 @@ struct BtorWorker
if (cell->type.in("$and", "$_AND_")) btor_op = "and";
if (cell->type.in("$or", "$_OR_")) btor_op = "or";
if (cell->type.in("$xor", "$_XOR_")) btor_op = "xor";
+ if (cell->type == "$concat") btor_op = "concat";
if (cell->type == "$_NAND_") btor_op = "nand";
if (cell->type == "$_NOR_") btor_op = "nor";
if (cell->type.in("$xnor", "$_XNOR_")) btor_op = "xnor";
@@ -214,6 +227,40 @@ struct BtorWorker
goto okay;
}
+ if (cell->type.in("$div", "$mod"))
+ {
+ string btor_op;
+ if (cell->type == "$div") btor_op = "div";
+ if (cell->type == "$mod") btor_op = "rem";
+ log_assert(!btor_op.empty());
+
+ int width = GetSize(cell->getPort("\\Y"));
+ width = std::max(width, GetSize(cell->getPort("\\A")));
+ width = std::max(width, GetSize(cell->getPort("\\B")));
+
+ bool a_signed = cell->hasParam("\\A_SIGNED") ? cell->getParam("\\A_SIGNED").as_bool() : false;
+ bool b_signed = cell->hasParam("\\B_SIGNED") ? cell->getParam("\\B_SIGNED").as_bool() : false;
+
+ int nid_a = get_sig_nid(cell->getPort("\\A"), width, a_signed);
+ int nid_b = get_sig_nid(cell->getPort("\\B"), width, b_signed);
+
+ int sid = get_bv_sid(width);
+ int nid = next_nid++;
+ btorf("%d %c%s %d %d %d\n", nid, a_signed || b_signed ? 's' : 'u', btor_op.c_str(), sid, nid_a, nid_b);
+
+ SigSpec sig = sigmap(cell->getPort("\\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("$_ANDNOT_", "$_ORNOT_"))
{
int sid = get_bv_sid(1);
@@ -304,7 +351,7 @@ struct BtorWorker
if (cell->type == "$lt") btor_op = "lt";
if (cell->type == "$le") btor_op = "lte";
if (cell->type.in("$eq", "$eqx")) btor_op = "eq";
- if (cell->type.in("$ne", "$nex")) btor_op = "ne";
+ if (cell->type.in("$ne", "$nex")) btor_op = "neq";
if (cell->type == "$ge") btor_op = "gte";
if (cell->type == "$gt") btor_op = "gt";
log_assert(!btor_op.empty());
@@ -506,6 +553,18 @@ struct BtorWorker
}
}
+ 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);
+
int sid = get_bv_sid(GetSize(sig_q));
int nid = next_nid++;
@@ -514,15 +573,7 @@ struct BtorWorker
else
btorf("%d state %d %s\n", nid, sid, log_id(symbol));
- 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);
-
- if (!initval.is_fully_undef()) {
- int nid_init_val = get_sig_nid(initval);
+ if (nid_init_val >= 0) {
int nid_init = next_nid++;
if (verbose)
btorf("; initval = %s\n", log_signal(initval));
@@ -575,6 +626,7 @@ struct BtorWorker
{
int abits = cell->getParam("\\ABITS").as_int();
int width = cell->getParam("\\WIDTH").as_int();
+ int nwords = cell->getParam("\\SIZE").as_int();
int rdports = cell->getParam("\\RD_PORTS").as_int();
int wrports = cell->getParam("\\WR_PORTS").as_int();
@@ -601,6 +653,52 @@ struct BtorWorker
int data_sid = get_bv_sid(width);
int bool_sid = get_bv_sid(1);
int sid = get_mem_sid(abits, width);
+
+ Const initdata = cell->getParam("\\INIT");
+ initdata.exts(nwords*width);
+ int nid_init_val = -1;
+
+ if (!initdata.is_fully_undef())
+ {
+ bool constword = true;
+ Const firstword = initdata.extract(0, width);
+
+ for (int i = 1; i < nwords; i++) {
+ Const thisword = initdata.extract(i*width, width);
+ if (thisword != firstword) {
+ constword = false;
+ break;
+ }
+ }
+
+ if (constword)
+ {
+ if (verbose)
+ btorf("; initval = %s\n", log_signal(firstword));
+ nid_init_val = get_sig_nid(firstword);
+ }
+ else
+ {
+ int nid_init_val = next_nid++;
+ btorf("%d state %d\n", nid_init_val, sid);
+
+ for (int i = 0; i < nwords; i++) {
+ Const thisword = initdata.extract(i*width, width);
+ if (thisword.is_fully_undef())
+ continue;
+ Const thisaddr(i, abits);
+ int nid_thisword = get_sig_nid(thisword);
+ int nid_thisaddr = get_sig_nid(thisaddr);
+ 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;
@@ -609,6 +707,12 @@ struct BtorWorker
else
btorf("%d state %d %s\n", nid, sid, log_id(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 (int port = 0; port < wrports; port++)
@@ -776,9 +880,28 @@ struct BtorWorker
else
{
if (bit_cell.count(bit) == 0)
- log_error("No driver for signal bit %s.\n", log_signal(bit));
- export_cell(bit_cell.at(bit));
- log_assert(bit_nid.count(bit));
+ {
+ SigSpec s = bit;
+
+ while (i+GetSize(s) < GetSize(sig) && sig[i+GetSize(s)].wire != nullptr &&
+ bit_cell.count(sig[i+GetSize(s)]) == 0)
+ s.append(sig[i+GetSize(s)]);
+
+ log_warning("No driver for signal %s.\n", log_signal(s));
+
+ int sid = get_bv_sid(GetSize(s));
+ int nid = next_nid++;
+ btorf("%d input %d %s\n", nid, sid);
+ nid_width[nid] = GetSize(s);
+
+ i += GetSize(s)-1;
+ continue;
+ }
+ else
+ {
+ export_cell(bit_cell.at(bit));
+ log_assert(bit_nid.count(bit));
+ }
}
}
@@ -892,9 +1015,8 @@ struct BtorWorker
btorf_push(stringf("output %s", log_id(wire)));
- int sid = get_bv_sid(GetSize(wire));
int nid = get_sig_nid(wire);
- btorf("%d output %d %d %s\n", next_nid++, sid, nid, log_id(wire));
+ btorf("%d output %d %s\n", next_nid++, nid, log_id(wire));
btorf_pop(stringf("output %s", log_id(wire)));
}
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