Makefile: Add support for generating C array at compile time

Generating C array at compile time based on details provided by
objects.mk is a very useful feature which will help us compile
only a subset of drivers or modules.

We add a bash script (carray.sh) which takes array details and
object/variable list from command-line to generate a C source
containing array of object/variable pointers. We also extend
top-level makefile to use carray.sh whenever specified through
objects.mk.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>

scripts/carray.sh

@@ -0,0 +1,77 @@
+#!/bin/bash
+
+function usage()
+{
+	echo "Usage:"
+	echo " $0 [options]"
+	echo "Options:"
+	echo "     -h                   Display help or usage"
+	echo "     -i <input_config>    Input config file"
+	echo "     -l <variable_list>   List of variables in the array (Optional)"
+	exit 1;
+}
+
+# Command line options
+CONFIG_FILE=""
+VAR_LIST=""
+
+while getopts "hi:l:" o; do
+	case "${o}" in
+	h)
+		usage
+		;;
+	i)
+		CONFIG_FILE=${OPTARG}
+		;;
+	l)
+		VAR_LIST=${OPTARG}
+		;;
+	*)
+		usage
+		;;
+	esac
+done
+shift $((OPTIND-1))
+
+if [ -z "${CONFIG_FILE}" ]; then
+	echo "Must specify input config file"
+	usage
+fi
+
+if [ ! -f "${CONFIG_FILE}" ]; then
+	echo "The input config file should be a present"
+	usage
+fi
+
+TYPE_HEADER=`cat ${CONFIG_FILE} | awk '{ if ($1 == "HEADER:") { printf $2; exit 0; } }'`
+if [ -z "${TYPE_HEADER}" ]; then
+	echo "Must specify HEADER: in input config file"
+	usage
+fi
+
+TYPE_NAME=`cat ${CONFIG_FILE} | awk '{ if ($1 == "TYPE:") { printf $2; for (i=3; i<=NF; i++) printf " %s", $i; exit 0; } }'`
+if [ -z "${TYPE_NAME}" ]; then
+	echo "Must specify TYPE: in input config file"
+	usage
+fi
+
+ARRAY_NAME=`cat ${CONFIG_FILE} | awk '{ if ($1 == "NAME:") { printf $2; exit 0; } }'`
+if [ -z "${ARRAY_NAME}" ]; then
+	echo "Must specify NAME: in input config file"
+	usage
+fi
+
+printf "#include <%s>\n\n" "${TYPE_HEADER}"
+
+for VAR in ${VAR_LIST}; do
+	printf "extern %s %s;\n" "${TYPE_NAME}" "${VAR}"
+done
+printf "\n"
+
+printf "%s *%s[] = {\n" "${TYPE_NAME}" "${ARRAY_NAME}"
+for VAR in ${VAR_LIST}; do
+	printf "\t&%s,\n" "${VAR}"
+done
+printf "};\n\n"
+
+printf "unsigned long %s_size = sizeof(%s) / sizeof(%s *);\n" "${ARRAY_NAME}" "${ARRAY_NAME}" "${TYPE_NAME}"