From: Clifford Wolf <clifford@clifford.at>
Date: Sun, 4 Nov 2018 13:41:28 +0000 (+0100)
Subject: Add proper error message for when smtbmc "append" fails
X-Git-Tag: yosys-0.9~421
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=d0acea4f2e6c98f09246584c2ac0903acc254093;p=yosys.git

Add proper error message for when smtbmc "append" fails

Signed-off-by: Clifford Wolf <clifford@clifford.at>
---

diff --git a/backends/smt2/smtbmc.py b/backends/smt2/smtbmc.py
index 6af2a5ac1..b944ee004 100644
--- a/backends/smt2/smtbmc.py
+++ b/backends/smt2/smtbmc.py
@@ -1259,7 +1259,11 @@ elif covermode:
                     smt_assert_antecedent("(|%s_t| s%d s%d)" % (topmod, i-1, i))
                     smt_assert_consequent(get_constr_expr(constr_assumes, i))
                 print_msg("Re-solving with appended steps..")
-                assert smt_check_sat() == "sat"
+                if smt_check_sat() == "unsat":
+                    print("%s Cannot appended steps without violating assumptions!" % smt.timestamp())
+                    found_failed_assert = True
+                    retstatus = False
+                    break
 
             reached_covers = smt.bv2bin(smt.get("(covers_%d s%d)" % (coveridx, step)))
             assert len(reached_covers) == len(cover_desc)
@@ -1377,7 +1381,11 @@ else:  # not tempind, covermode
                             smt_assert_antecedent("(|%s_h| s%d)" % (topmod, i))
                             smt_assert_antecedent("(|%s_t| s%d s%d)" % (topmod, i-1, i))
                             smt_assert_consequent(get_constr_expr(constr_assumes, i))
-                            assert smt_check_sat() == "sat"
+                    print_msg("Re-solving with appended steps..")
+                    if smt_check_sat() == "unsat":
+                        print("%s Cannot appended steps without violating assumptions!" % smt.timestamp())
+                        retstatus = False
+                        break
                     print_anyconsts(step)
                     for i in range(step, last_check_step+1):
                         print_failed_asserts(i)