aiger: check supported modes and aigbmc fixes

sbysrc/sby_engine_aiger.py

@@ -28,16 +28,25 @@ def run(mode, task, engine_idx, engine):
     for o, a in opts:
         task.error("Unexpected AIGER engine options.")
 
+    status_2 = "UNKNOWN"
+
     if solver_args[0] == "suprove":
+        if mode not in ["live", "prove"]:
+            task.error("The aiger solver 'suprove' is only supported in live and prove modes.")
         if mode == "live" and (len(solver_args) == 1 or solver_args[1][0] != "+"):
             solver_args.insert(1, "+simple_liveness")
         solver_cmd = " ".join([task.exe_paths["suprove"]] + solver_args[1:])
 
     elif solver_args[0] == "avy":
+        if mode != "prove":
+            task.error("The aiger solver 'avy' is only supported in prove mode.")
         solver_cmd = " ".join([task.exe_paths["avy"], "--cex", "-"] + solver_args[1:])
 
     elif solver_args[0] == "aigbmc":
-        solver_cmd = " ".join([task.exe_paths["aigbmc"]] + solver_args[1:])
+        if mode != "bmc":
+            task.error("The aiger solver 'aigbmc' is only supported in bmc mode.")
+        solver_cmd = " ".join([task.exe_paths["aigbmc"], str(task.opt_depth - 1)] + solver_args[1:])
+        status_2 = "PASS"  # aigbmc outputs status 2 when BMC passes
 
     else:
         task.error(f"Invalid solver command {solver_args[0]}.")
@@ -76,7 +85,7 @@ def run(mode, task, engine_idx, engine):
             print(line, file=aiw_file)
             if line == "0": proc_status = "PASS"
             if line == "1": proc_status = "FAIL"
-            if line == "2": proc_status = "UNKNOWN"
+            if line == "2": proc_status = status_2
 
         return None
 

sbysrc/sby_mode_bmc.py

@@ -39,6 +39,10 @@ def run(task):
             import sby_engine_abc
             sby_engine_abc.run("bmc", task, engine_idx, engine)
 
+        elif engine[0] == "aiger":
+            import sby_engine_aiger
+            sby_engine_aiger.run("bmc", task, engine_idx, engine)
+
         elif engine[0] == "btor":
             import sby_engine_btor
             sby_engine_btor.run("bmc", task, engine_idx, engine)

tests/unsorted/bmc_len.sby

@@ -0,0 +1,36 @@
+[tasks]
+smtbmc_pass: smtbmc pass
+smtbmc_fail: smtbmc fail
+aigbmc_pass: aigbmc pass
+aigbmc_fail: aigbmc fail
+btormc_pass: btormc pass
+btormc_fail: btormc fail
+abc_pass: abc pass
+abc_fail: abc fail
+
+[options]
+mode bmc
+pass: expect pass
+fail: expect fail
+pass: depth 5
+fail: depth 6
+
+[engines]
+smtbmc: smtbmc boolector
+aigbmc: aiger aigbmc
+btormc: btor btormc
+abc: abc bmc3
+
+[script]
+read -formal top.sv
+prep -top top
+
+[file top.sv]
+module top(input clk);
+    reg [7:0] counter = 0;
+
+    always @(posedge clk) begin
+        counter <= counter + 1;
+        assert (counter < 4);
+    end
+endmodule