Add optional SEED=n command line option to Makefile, and -S n command line option to test scripts, for deterministic regression tests.

tests/share/generate.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
 
+import argparse
 import sys
 import random
 from contextlib import contextmanager
@@ -21,7 +22,16 @@ def maybe_plus_x(expr):
     else:
         return expr
 
-for idx in range(100):
+parser = argparse.ArgumentParser(formatter_class = argparse.ArgumentDefaultsHelpFormatter)
+parser.add_argument('-S', '--seed',  type = int, help = 'seed for PRNG')
+parser.add_argument('-c', '--count', type = int, default = 100, help = 'number of test cases to generate')
+args = parser.parse_args()
+
+if args.seed is not None:
+    print("PRNG seed: %d" % args.seed)
+    random.seed(args.seed)
+
+for idx in range(args.count):
     with open('temp/uut_%05d.v' % idx, 'w') as f:
         with redirect_stdout(f):
             if random.choice(['bin', 'uni']) == 'bin':

tests/share/run-test.sh

@@ -5,10 +5,22 @@
 
 set -e
 
+OPTIND=1
+count=100
+seed=""    # default to no seed specified
+while getopts "c:S:" opt
+do
+    case "$opt" in
+	c) count="$OPTARG" ;;
+	S) seed="-S $OPTARG" ;;
+    esac
+done
+shift "$((OPTIND-1))"
+
 rm -rf temp
 mkdir -p temp
 echo "generating tests.."
-python3 generate.py
+python3 generate.py -c $count $seed
 
 echo "running tests.."
 for i in $( ls temp/*.ys | sed 's,[^0-9],,g; s,^0*\(.\),\1,g;' ); do