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support arbitrary initialization functions in btor2aiger #27

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merged 1 commit into from
Sep 3, 2024
Merged

support arbitrary initialization functions in btor2aiger #27

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2 changes: 2 additions & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
*.o
makefile
catbtor
deps/
build/
44 changes: 34 additions & 10 deletions src/btor2aiger.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -387,7 +387,8 @@ add_state_to_aiger (Btor *btor,
aiger *aig,
BoolectorNode *state,
BoolectorNode *next,
BoolectorNode *init)
BoolectorNode *init,
std::vector<std::pair<uint64_t, uint64_t> > &init_constrains)
{
size_t nbits;
const char *sym;
Expand All @@ -414,18 +415,16 @@ add_state_to_aiger (Btor *btor,

for (size_t i = 0; i < nbits; ++i)
{
if (init_bits && init_bits[i] != 0 && init_bits[i] != 1)
{
/* Note: BTOR2 supports arbitrary initialization functions, but AIGER
* only supports 0/1/undefined. */
die ("Found non-constant initialization");
}
sym = boolector_aig_get_symbol (amgr, state_bits[i]);
if (next_bits)
{
reset_val = init_bits ? init_bits[i] : state_bits[i];
aiger_add_latch (aig, state_bits[i], next_bits[i], sym);
aiger_add_reset (aig, state_bits[i], reset_val);
if (!(init_bits && init_bits[i] != 0 && init_bits[i] != 1)) {
reset_val = init_bits ? init_bits[i] : state_bits[i];
aiger_add_reset (aig, state_bits[i], reset_val);
} else {
init_constrains.push_back(std::make_pair(state_bits[i], init_bits[i]));
}
}
else
{
Expand Down Expand Up @@ -472,11 +471,23 @@ add_bad_to_aiger (Btor *btor,
boolector_aig_free_bits (amgr, bits, nbits);
}

unsigned conj(aiger *aig, unsigned x, unsigned y) {
const unsigned new_var = (aig->maxvar + 1) * 2;
aiger_add_and(aig, new_var, x, y);
return new_var;
};

unsigned eq(aiger *aig, unsigned x, unsigned y) {
return aiger_not(conj(aig, aiger_not(conj(aig, x, y)),
aiger_not(conj(aig, aiger_not(x), aiger_not(y)))));
}

static void
generate_aiger (Btor2Model &model, bool ascii_mode, bool ignore_error)
{
BoolectorAIGMgr *amgr;
aiger *aig;
std::vector<std::pair<uint64_t, uint64_t> > init_constrains;

amgr = boolector_aig_new (model.btor);

Expand All @@ -497,6 +508,7 @@ generate_aiger (Btor2Model &model, bool ascii_mode, bool ignore_error)
for (auto kv : model.init)
{
boolector_aig_bitblast (amgr, kv.second);
boolector_aig_visit (amgr, kv.second, aig_visitor, &aig_visitor_state);
}

for (auto kv : model.next)
Expand All @@ -512,7 +524,8 @@ generate_aiger (Btor2Model &model, bool ascii_mode, bool ignore_error)
aig,
kv.second,
model.get_next (kv.first),
model.get_init (kv.first));
model.get_init (kv.first),
init_constrains);
}

for (BoolectorNode *n : model.constraints)
Expand All @@ -534,6 +547,17 @@ generate_aiger (Btor2Model &model, bool ascii_mode, bool ignore_error)
{
die (err);
}

if (!init_constrains.empty()) {
unsigned init_latch = (aig->maxvar + 1) * 2;
aiger_add_latch(aig, init_latch, 0, "init latch");
aiger_add_reset(aig, init_latch, 1);
for (unsigned i = 0; i < init_constrains.size(); ++i) {
unsigned init_eq = eq(aig, init_constrains[i].first, init_constrains[i].second);
unsigned init = aiger_not(conj(aig, init_latch, aiger_not(init_eq)));
aiger_add_constraint(aig, init, 0);
}
}

aiger_write_to_file (
aig, ascii_mode ? aiger_ascii_mode : aiger_binary_mode, stdout);
Expand Down
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