[v2,6/8] scheck: allow multiple assertions

Commit Message

Luc Van Oostenryck April 12, 2021, 9:21 p.m. UTC

With the SMT solver used here, by default, once an expression is
checked it's kinda consumed by the process and can't be reused
anymore for another check.

So, enable the incremental mode: it allows to call boolecter_sat()
several times.

Note: Another would be, of course, to just AND together all assertions
      and just check this but then we would lost the finer grained
      diagnostic in case of failure.

Signed-off-by: Luc Van Oostenryck <[e-mail]>
---
 scheck.c               | 5 +++--
 validation/scheck/ok.c | 4 ----
 2 files changed, 3 insertions(+), 6 deletions(-)

Patch

diff --git a/scheck.c b/scheck.c
index c64e865136c5..efa5c1c3247b 100644
--- a/scheck.c
+++ b/scheck.c
@@ -252,6 +252,7 @@  static bool check_function(struct entrypoint *ep)
 	int rc = 0;
 
 	boolector_set_opt(btor, BTOR_OPT_MODEL_GEN, 1);
+	boolector_set_opt(btor, BTOR_OPT_INCREMENTAL, 1);
 
 	FOR_EACH_PTR(ep->bbs, bb) {
 		struct instruction *insn;
@@ -274,8 +275,8 @@  static bool check_function(struct entrypoint *ep)
 				ternop(btor, insn);
 				break;
 			case OP_CALL:
-				rc = check_call(btor, insn);
-				goto out;
+				rc &= check_call(btor, insn);
+				break;
 			case OP_RET:
 				goto out;
 			default:
diff --git a/validation/scheck/ok.c b/validation/scheck/ok.c
index 76c04c4f6870..f4a0daabfe9a 100644
--- a/validation/scheck/ok.c
+++ b/validation/scheck/ok.c
@@ -1,10 +1,6 @@ 
 static void ok(int x)
 {
 	__assert((~x) == (~0 - x));	// true but not simplified yet
-}
-
-static void also_ok(int x)
-{
 	__assert_eq(~x, ~0 - x);
 }