#!/bin/bash

############################
#
# Author: Koustubha Bhat
# Date  : 3-April-2014
# VU University, Amsterdam.
#
############################

set -o errexit

MYPWD=`pwd`
MINIX_ROOT=
MINIX_LLVM_DIR=
TARGET_MODULES=
MINIX_MODS=
STATIC_LIBS=
LDFLAGS_PLACEHOLDER=" "

# Set default values to essential variables.
: ${GENERATE_MAP="no"}
: ${C="servers,drivers"}

function usage()
{
   echo "C=<target Minix module> $0 [<static library name>]"
   echo 
   echo "Examples:"
   echo "C=pm,vfs ./$0 dummy"
   echo "C=drivers ./$0 dummy"
   echo 
}

function check_current_dir()
{
   #Make sure we are running from the root dir of the Minix sources
   if [ -d ./minix/drivers ] && [ -d ./minix/servers ] ; then
        MINIX_ROOT="${MYPWD}"
   elif [ -d ../../minix/drivers ] && [ -d ../../minix/servers ]; then
        MINIX_ROOT="${MYPWD}/../.."
   else
        echo "Please run the script from either of the following locations:"
        echo "> Root of the Minix sources."
        echo "          OR"
        echo "> minix/llvm directory of the Minix sources."
        exit 1
   fi

   MINIX_LLVM_DIR="${MINIX_ROOT}/minix/llvm"
}

function find_static_libs()
{
	local stat_libs_llvmapps=
	local stat_libs_minix=
	local install_dir_save=

	stat_libs_llvmapps=`build_llvm_libs $*`
	
	install_dir_save=${INSTALL_DIR}

	INSTALL_DIR=${MINIX_LLVM_BIN_DIR}
	stat_libs_minix=`build_llvm_libs $*`

	INSTALL_DIR=${install_dir_save}

	echo "${stat_libs_llvmapps} ${stat_libs_minix}"
}

#Make sure we are running from the right directory
check_current_dir

# Arguments check
if [ "$1" == "--help" ] || [ "$1" == "-h" ]; then
	usage
        exit 1
fi

# set up the bridge to llvm-apps repository and initialize
. ${MINIX_LLVM_DIR}/minix.inc
. ${ROOT}/apps/scripts/include/configure.llvm.inc

echo "LLVM root directory is set to :"
echo "	${ROOT}"
echo ".so and .bcc binaries of LLVM passes set to be picked up from:"
echo "	${INSTALL_DIR}"
echo " 	     and"
echo "  ${MINIX_LLVM_BIN_DIR}"
echo 

# Picking up the selected modules

if [ "${GENERATE_MAP}" != "" ] && [[ ${GENERATE_MAP} =~ [yY][eE][sS] ]]; then
	generate_modules_map
fi 

STATIC_LIBS=`find_static_libs $*`

TARGET_MODULES=`echo $C | sed -e "s/,/ /g"`

for m in ${TARGET_MODULES}
do
	for p in `get_modules_path $m`
	do 
		MINIX_MODS="${MINIX_MODS} $p"
	done 
done

# Show info
echo "relink.llvm: Executing with following parameters..."
echo "LIBRARIES                 :       $*"
echo "Target Minix modules      :       ${MINIX_MODS}"
echo

cd ${MINIX_ROOT}	

for m in ${MINIX_MODS}
do 
	echo "Relinking $m ..."
	n=`get_module_name $m`
	if [ "" == "$n" ]; then
		echo "Error: Couldn't fetch the module name for $m"
		continue
	fi
	clean_module $n $m "relink"
	if [ "${STATIC_LIBS}"!="" ]; then
		STATIC_LIBS=`echo ${STATIC_LIBS} | sed -e "s/\ /\\\ /g"`
		LDFLAGS_PLACEHOLDER="BITCODE_LD_FLAGS_1ST.$n=${STATIC_LIBS}"
	fi

	env "`echo ${LDFLAGS_PLACEHOLDER}`" MKBITCODE=yes \
	${TOOLDIR}/nbmake-${ARCH} -C $m
	echo 
done

cd ${MYPWD}