#!/bin/bash

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

##################
# Initialization
##################

set -o errexit

MYPWD="`pwd`"
MINIX_ROOT=
MINIX_LLVM_DIR=
GOLD_DEST_DIR=
DEFAULT_LLVM_ROOT=
EXITCODE=0

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="${MINIX_ROOT}/minix/llvm"
   GOLD_DEST_DIR="${MINIX_ROOT}/minix/llvm/bin"
   DEFAULT_LLVM_ROOT="${MINIX_ROOT}/../../llvm-apps"
}

# Make sure we are running from the right directory
check_current_dir

# LLVM ROOT is the bridging connection from minix branch to the llvm-apps branch
if [ "${ROOT}" == "" ]; then
	
	echo "\${ROOT} is not set."
	echo "Please specify the path to the \"llvm-apps\" repository..."
	echo "Default value: ${DEFAULT_LLVM_ROOT} . "
	echo "If this is correct, press ENTER. Otherwise please enter the path."
	if [ "$INTERACTIVE" = "no" ]; then
		response=""
	else
		read response
	fi

	if [ "" == "${response}" ]; then
		ROOT=${DEFAULT_LLVM_ROOT}
	else
		ROOT=${response}
	fi
fi	
echo "LLVM root directory is set to :"
echo "  ${ROOT}"

# Persist the LLVM ROOT path information
[ -f ${MINIX_LLVM_DIR}/common.inc ] || cp ${MINIX_LLVM_DIR}/common.inc.default ${MINIX_LLVM_DIR}/common.inc
ROOT_1=`echo ${ROOT} | sed "s/\\\//\\\\\\\\\//g"`
sed -i "s/ROOT=.*$/ROOT=\"${ROOT_1}\"/g" ${MINIX_LLVM_DIR}/common.inc
. ${MINIX_LLVM_DIR}/minix.inc

# Configure llvm-apps
cp ${ROOT}/conf/common.overrides.llvm-minix.inc ${ROOT}/common.overrides.llvm.inc
MINIX_ROOT_1=`readlink -f ${MINIX_ROOT}`
echo "_MINIX_ROOT=\"${MINIX_ROOT_1}\"" > ${ROOT}/common.overrides.minix.inc

if [ ! -d ${ROOT}/.tmp ]; then
	mkdir ${ROOT}/.tmp 2>/dev/null || true
fi

# Set default values for essential variables
: ${JOBS=1}
: ${GEN_GOLD_PLUGIN="yes"}
: ${REBUILD_MINIX="yes"}

########################
# Generate Gold Plugin
########################

if [ "${GEN_GOLD_PLUGIN}" == "yes" ] && [ -f "${MYPWD}/.gold_generated" ]; then
	echo "It is found that Gold plugin has already been generated. Would you like to re-generate? [y | n]"
	if [ "$INTERACTIVE" == "no" ]; then
		response=n
	else
		read response
	fi
	if [ "y" == "$response" ] || [ "Y" == "$response" ]; then
		echo "Gold shall be regenerated."
	else
		GEN_GOLD_PLUGIN="no"
	fi
fi

if [ "${GEN_GOLD_PLUGIN}" == "yes" ]; then
        ${MINIX_LLVM_DIR}/generate_gold_plugin.sh 
	if [ ! -f "${GOLD_DEST_DIR}/libLTO.so" ] || [ ! -f "${GOLD_DEST_DIR}/LLVMgold.so" ]; then 
                echo "Failure: generate_gold_plugin.sh"
		exit 1
        fi

       	echo "Finished generating gold plugin."
        touch "${MYPWD}/.gold_generated"
else
	echo "Gold plugin generation: NO"
fi

########################
# Build Minix
########################
if [ "${REBUILD_MINIX}" == "yes" ]; then

	echo "Building Minix..."
	echo "CC:$CC"
	echo "CXX:$CXX"
	echo "JOBS:$JOBS"
	echo 
	cd ${MINIX_ROOT}
	BUILDVARS="-V MKBITCODE=yes" ./releasetools/x86_hdimage.sh
	EXITCODE=$?
	cd ${MYPWD}
	if [ "$EXITCODE" != "0" ]; then
        	echo "Error: Failed building Minix source code."
	        exit $EXITCODE
	else
		echo "Completed building Minix source code."
		exit $EXITCODE
	fi
else
	echo "Building Minix: NO"
fi

# Reconfigure llvm-apps
MINIX_TOOLS_DIR=$(readlink -f ${MINIX_ROOT}/../obj.i386/tooldir.*)
echo "MINIX_TOOLS_DIR=\"${MINIX_TOOLS_DIR}\"" >> ${ROOT}/common.overrides.minix.inc