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-rw-r--r--backends/smt2/smt2.cc23
1 files changed, 19 insertions, 4 deletions
diff --git a/backends/smt2/smt2.cc b/backends/smt2/smt2.cc
index 1525d32f..3d872c63 100644
--- a/backends/smt2/smt2.cc
+++ b/backends/smt2/smt2.cc
@@ -470,14 +470,17 @@ struct Smt2Worker
if (verbose) log("=> export logic driving asserts\n");
- vector<int> assert_list;
+ vector<int> assert_list, assume_list;
for (auto cell : module->cells())
- if (cell->type == "$assert") {
+ if (cell->type.in("$assert", "$assume")) {
string name_a = get_bool(cell->getPort("\\A"));
string name_en = get_bool(cell->getPort("\\EN"));
decls.push_back(stringf("(define-fun |%s#%d| ((state |%s_s|)) Bool (or %s (not %s))) ; %s\n",
log_id(module), idcounter, log_id(module), name_a.c_str(), name_en.c_str(), log_id(cell)));
- assert_list.push_back(idcounter++);
+ if (cell->type == "$assert")
+ assert_list.push_back(idcounter++);
+ else
+ assume_list.push_back(idcounter++);
}
for (int iter = 1; !registers.empty(); iter++)
@@ -510,6 +513,15 @@ struct Smt2Worker
decls.push_back(stringf("(define-fun |%s_a| ((state |%s_s|)) Bool %s)\n",
log_id(module), log_id(module), assert_expr.c_str()));
+ string assume_expr = assume_list.empty() ? "true" : "(and";
+ if (!assume_list.empty()) {
+ for (int i : assume_list)
+ assume_expr += stringf(" (|%s#%d| state)", log_id(module), i);
+ assume_expr += ")";
+ }
+ decls.push_back(stringf("(define-fun |%s_u| ((state |%s_s|)) Bool %s)\n",
+ log_id(module), log_id(module), assume_expr.c_str()));
+
string init_expr = init_list.empty() ? "true" : "(and";
if (!init_list.empty()) {
for (auto &str : init_list)
@@ -550,7 +562,7 @@ struct Smt2Backend : public Backend {
log("\n");
log("Write a SMT-LIBv2 [1] description of the current design. For a module with name\n");
log("'<mod>' this will declare the sort '<mod>_s' (state of the module) and the\n");
- log("functions '<mod>_t' (transition), '<mod>_a' (asserts), and '<mod>_i' (init).\n");
+ log("functions operating on that state.\n");
log("\n");
log("The '<mod>_s' sort represents a module state. Additional '<mod>_n' functions\n");
log("are provided that can be used to access the values of the signals in the module.\n");
@@ -565,6 +577,9 @@ struct Smt2Backend : public Backend {
log("The '<mod>_a' function evaluates to 'true' when the given state satisfies\n");
log("the asserts in the module.\n");
log("\n");
+ log("The '<mod>_u' function evaluates to 'true' when the given state satisfies\n");
+ log("the assumptions in the module.\n");
+ log("\n");
log("The '<mod>_i' function evaluates to 'true' when the given state conforms\n");
log("to the initial state.\n");
log("\n");