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-rw-r--r--backends/smt2/smt2.cc63
1 files changed, 57 insertions, 6 deletions
diff --git a/backends/smt2/smt2.cc b/backends/smt2/smt2.cc
index ed6f3aff9..aa865e7fa 100644
--- a/backends/smt2/smt2.cc
+++ b/backends/smt2/smt2.cc
@@ -53,6 +53,8 @@ struct Smt2Worker
std::map<int, int> bvsizes;
dict<IdString, char*> ids;
+ bool is_smtlib2_module;
+
const char *get_id(IdString n)
{
if (ids.count(n) == 0) {
@@ -112,9 +114,10 @@ struct Smt2Worker
}
Smt2Worker(RTLIL::Module *module, bool bvmode, bool memmode, bool wiresmode, bool verbose, bool statebv, bool statedt, bool forallmode,
- dict<IdString, int> &mod_stbv_width, dict<IdString, dict<IdString, pair<bool, bool>>> &mod_clk_cache) :
- ct(module->design), sigmap(module), module(module), bvmode(bvmode), memmode(memmode), wiresmode(wiresmode),
- verbose(verbose), statebv(statebv), statedt(statedt), forallmode(forallmode), mod_stbv_width(mod_stbv_width)
+ dict<IdString, int> &mod_stbv_width, dict<IdString, dict<IdString, pair<bool, bool>>> &mod_clk_cache)
+ : ct(module->design), sigmap(module), module(module), bvmode(bvmode), memmode(memmode), wiresmode(wiresmode), verbose(verbose),
+ statebv(statebv), statedt(statedt), forallmode(forallmode), mod_stbv_width(mod_stbv_width),
+ is_smtlib2_module(module->has_attribute(ID::smtlib2_module))
{
pool<SigBit> noclock;
@@ -124,6 +127,9 @@ struct Smt2Worker
memories = Mem::get_all_memories(module);
for (auto &mem : memories)
{
+ if (is_smtlib2_module)
+ log_error("Memory %s.%s not allowed in module with smtlib2_module attribute", get_id(module), mem.memid.c_str());
+
mem.narrow();
mem_dict[mem.memid] = &mem;
for (auto &port : mem.wr_ports)
@@ -893,10 +899,25 @@ struct Smt2Worker
log_id(cell->type), log_id(module), log_id(cell));
}
+ void verify_smtlib2_module()
+ {
+ if (!module->get_blackbox_attribute())
+ log_error("Module %s with smtlib2_module attribute must also have blackbox attribute.\n", log_id(module));
+ if (module->cells().size() > 0)
+ log_error("Module %s with smtlib2_module attribute must not have any cells inside it.\n", log_id(module));
+ for (auto wire : module->wires())
+ if (!wire->port_id)
+ log_error("Wire %s.%s must be input or output since module has smtlib2_module attribute.\n", log_id(module),
+ log_id(wire));
+ }
+
void run()
{
if (verbose) log("=> export logic driving outputs\n");
+ if (is_smtlib2_module)
+ verify_smtlib2_module();
+
pool<SigBit> reg_bits;
for (auto cell : module->cells())
if (cell->type.in(ID($ff), ID($dff), ID($_FF_), ID($_DFF_P_), ID($_DFF_N_))) {
@@ -905,11 +926,24 @@ struct Smt2Worker
reg_bits.insert(bit);
}
+ std::string smtlib2_inputs;
+ if (is_smtlib2_module) {
+ for (auto wire : module->wires()) {
+ if (!wire->port_input)
+ continue;
+ smtlib2_inputs += stringf("(|%s| (|%s_n %s| state))\n", get_id(wire), get_id(module), get_id(wire));
+ }
+ }
+
for (auto wire : module->wires()) {
bool is_register = false;
for (auto bit : SigSpec(wire))
if (reg_bits.count(bit))
is_register = true;
+ bool is_smtlib2_comb_expr = wire->has_attribute(ID::smtlib2_comb_expr);
+ if (is_smtlib2_comb_expr && !is_smtlib2_module)
+ log_error("smtlib2_comb_expr is only valid in a module with the smtlib2_module attribute: wire %s.%s", log_id(module),
+ log_id(wire));
if (wire->port_id || is_register || wire->get_bool_attribute(ID::keep) || (wiresmode && wire->name.isPublic())) {
RTLIL::SigSpec sig = sigmap(wire);
std::vector<std::string> comments;
@@ -924,8 +958,18 @@ struct Smt2Worker
if (GetSize(wire) == 1 && (clock_posedge.count(sig) || clock_negedge.count(sig)))
comments.push_back(stringf("; yosys-smt2-clock %s%s%s\n", get_id(wire),
clock_posedge.count(sig) ? " posedge" : "", clock_negedge.count(sig) ? " negedge" : ""));
+ std::string smtlib2_comb_expr;
+ if (is_smtlib2_comb_expr) {
+ smtlib2_comb_expr =
+ "(let (\n" + smtlib2_inputs + ")\n" + wire->get_string_attribute(ID::smtlib2_comb_expr) + "\n)";
+ if (wire->port_input || !wire->port_output)
+ log_error("smtlib2_comb_expr is only valid on output: wire %s.%s", log_id(module), log_id(wire));
+ if (!bvmode && GetSize(sig) > 1)
+ log_error("smtlib2_comb_expr is unsupported on multi-bit wires when -nobv is specified: wire %s.%s",
+ log_id(module), log_id(wire));
+ }
if (bvmode && GetSize(sig) > 1) {
- std::string sig_bv = get_bv(sig);
+ std::string sig_bv = is_smtlib2_comb_expr ? smtlib2_comb_expr : get_bv(sig);
if (!comments.empty())
decls.insert(decls.end(), comments.begin(), comments.end());
decls.push_back(stringf("(define-fun |%s_n %s| ((state |%s_s|)) (_ BitVec %d) %s)\n",
@@ -936,7 +980,7 @@ struct Smt2Worker
} else {
std::vector<std::string> sig_bool;
for (int i = 0; i < GetSize(sig); i++) {
- sig_bool.push_back(get_bool(sig[i]));
+ sig_bool.push_back(is_smtlib2_comb_expr ? smtlib2_comb_expr : get_bool(sig[i]));
}
if (!comments.empty())
decls.insert(decls.end(), comments.begin(), comments.end());
@@ -964,6 +1008,10 @@ struct Smt2Worker
vector<string> init_list;
for (auto wire : module->wires())
if (wire->attributes.count(ID::init)) {
+ if (is_smtlib2_module)
+ log_error("init attribute not allowed on wires in module with smtlib2_module attribute: wire %s.%s",
+ log_id(module), log_id(wire));
+
RTLIL::SigSpec sig = sigmap(wire);
Const val = wire->attributes.at(ID::init);
val.bits.resize(GetSize(sig), State::Sx);
@@ -1687,7 +1735,10 @@ struct Smt2Backend : public Backend {
for (auto module : sorted_modules)
{
- if (module->get_blackbox_attribute() || module->has_processes_warn())
+ if (module->get_blackbox_attribute() && !module->has_attribute(ID::smtlib2_module))
+ continue;
+
+ if (module->has_processes_warn())
continue;
log("Creating SMT-LIBv2 representation of module %s.\n", log_id(module));
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-31 14:11:34 +0000