#!/bin/bash

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

set -o errexit

MYPWD=`pwd`
MINIX_ROOT=
MINIX_LLVM_DIR=
LLVMPASS=
LLVMARGS=
LLVMPASS_PATHS=
TARGET_MODULES=
MINIX_MODS=

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

function usage()
{
   echo "C=<target Minix module(s)> $0 [<LLVM-pass name> ...]"
   echo 
   echo "Examples:"
   echo "C=pm,vfs ./$0 dummy"
   echo "C=drivers ./$0 dummy"
   echo 
   echo "Additional arguments to the passes may be passed through \${LLVM_PASS_ARGS}."
   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 check_args()
{
   local llvmpass=
   local llvmpass_path=
   local exit_flag=0

   if [ $# -ge 1 ]; then

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

	for p in "$@" ; 
        do
		llvmpass=$p
		# Default value for llvmargs not specified deliberately

		if [ -f "${INSTALL_DIR}/${llvmpass}.so" ]; then
			llvmpass_path="${INSTALL_DIR}/${llvmpass}.so"
		elif [ -f "${MINIX_LLVM_BIN_DIR}/${llvmpass}.so" ]; then
			llvmpass_path="${MINIX_LLVM_BIN_DIR}/${llvmpass}.so"
		else
			llvmpass_path=""
		fi
		if [ "$llvmpass_path" != "" ]; then
			LLVMPASS_PATHS+=" -load=${llvmpass_path}"
		fi
		LLVMPASS_PATHS+=" -${llvmpass}"
	done

	if [ ${exit_flag} == 1 ]; then
		echo "Searched in the following location(s):"
		echo "  ${INSTALL_DIR}" 
		echo "  ${MINIX_LLVM_BIN_DIR}"
		exit 1
	fi

	LLVMARGS=" ${LLVM_PASS_ARGS}"	
  fi
}
  
#Make sure we are running from the root dir of the Minix sources
check_current_dir

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

# Arguments check
check_args "$@"

if [ "$C" == "" ]; then
	C="hello"
fi 

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

: ${OPTFLAGS="-disable-opt -disable-internalize -disable-inlining -load ${MINIX_LLVM_DIR}/bin/weak-alias-module-override.so -weak-alias-module-override"}

# If we are really instrumenting with some pass...
if [ "${LLVMPASS_PATHS}" != "" ]; then
	OPTFLAGS=" ${OPTFLAGS} ${LLVMPASS_PATHS} ${LLVMARGS}"
fi

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 "Build.llvm: Executing with following parameters..."
echo "LLVM pass		:	${LLVMPASS}"
echo "LLVM pass arguments	: 	${LLVMARGS}"
echo "Target Minix modules	:	${MINIX_MODS}"
echo "OPTFLAGS value		:	${OPTFLAGS}"
echo

cd ${MINIX_ROOT}

for m in ${MINIX_MODS}
do 
	echo "Instrumenting $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
	OPTFLAGS=`echo ${OPTFLAGS} | sed -e "s/\ /\\\ /g"`
	OPTFLAGS_PLACEHOLDER="OPTFLAGS.$n=${OPTFLAGS}"
	
	(env "`echo ${OPTFLAGS_PLACEHOLDER}`" MKBITCODE=yes \
	${TOOLDIR}/nbmake-${ARCH} -C $m all install && echo "INFO: $m successfully instrumented." ) || echo "ERROR: Failed instrumenting $m"
	echo 
done

cd ${MYPWD}