code refactoring for Vivado, sv2v, and yosys compatibility

hw/syn/yosys/sv2v.sh

@@ -0,0 +1,57 @@
+#!/bin/bash
+
+# this script uses sv2v and yosys tools to run.
+# sv2v: https://github.com/zachjs/sv2v
+# yosys: http://www.clifford.at/yosys/
+
+# exit when any command fails
+set -e
+
+source=""
+includes=()
+macro_args=""
+output_file=out.v
+
+usage() { echo "$0 usage:" && grep " .)\ #" $0; exit 0; }
+[ $# -eq 0 ] && usage
+while getopts "o:I:D:h" arg; do
+    case $arg in
+    s) # source
+        source=${OPTARG}
+        ;;
+    o) # output-file
+        output_file=${OPTARG}
+        ;;
+    I) # include directory
+        includes+=(${OPTARG})
+        ;;
+    D) # macro definition
+        macro_args="$macro_args -D${OPTARG}"
+        ;;
+    h | *) 
+      usage
+      exit 0
+      ;;
+  esac
+done
+
+# process include paths
+inc_args=""
+for dir in "${includes[@]}" 
+do
+	inc_args="$inc_args -I$dir"
+done
+
+# process source files
+file_args=$source
+for dir in "${includes[@]}" 
+do
+    for file in $(find $dir -maxdepth 1 -name '*.v' -o -name '*.sv' -type f) 
+    do
+        echo "file: $file"
+        file_args="$file_args $file"
+    done
+done
+
+# system-verilog to verilog conversion
+sv2v $macro_args $inc_args $file_args -v -w $output_file