#!/usr/bin/env bash

srcdir=$(cd "$(dirname "$0")"; pwd)
prefix=/usr/local
cc=gcc
cxx=g++
ld=ld
objcopy=objcopy
objdump=objdump
ar=ar
addr2line=addr2line
arch=`uname -m | sed -e 's/i.86/i386/;s/arm.*/arm/;s/ppc64.*/ppc64/'`
host=$arch
cross_prefix=
endian=""
pretty_print_stacks=yes
environ_default=yes
u32_long=

usage() {
    cat <<-EOF
	Usage: $0 [options]

	Options include:
	    --arch=ARCH            architecture to compile for ($arch)
	    --processor=PROCESSOR  processor to compile for ($arch)
	    --cross-prefix=PREFIX  cross compiler prefix
	    --cc=CC		   c compiler to use ($cc)
	    --cxx=CXX		   c++ compiler to use ($cxx)
	    --ld=LD		   ld linker to use ($ld)
	    --prefix=PREFIX        where to install things ($prefix)
	    --endian=ENDIAN        endianness to compile for (little or big, ppc64 only)
	    --[enable|disable]-pretty-print-stacks
	                           enable or disable pretty stack printing (enabled by default)
	    --[enable|disable]-default-environ
	                           enable or disable the generation of a default environ when
	                           no environ is provided by the user (enabled by default)
EOF
    exit 1
}

while [[ "$1" = -* ]]; do
    opt="$1"; shift
    arg=
    if [[ "$opt" = *=* ]]; then
	arg="${opt#*=}"
	opt="${opt%%=*}"
    fi
    case "$opt" in
	--prefix)
	    prefix="$arg"
	    ;;
        --arch)
	    arch="$arg"
	    ;;
        --processor)
	    processor="$arg"
	    ;;
	--cross-prefix)
	    cross_prefix="$arg"
	    ;;
	--endian)
	    endian="$arg"
	    ;;
	--cc)
	    cc="$arg"
	    ;;
	--cxx)
	    cxx="$arg"
	    ;;
	--ld)
	    ld="$arg"
	    ;;
	--enable-pretty-print-stacks)
	    pretty_print_stacks=yes
	    ;;
	--disable-pretty-print-stacks)
	    pretty_print_stacks=no
	    ;;
	--enable-default-environ)
	    environ_default=yes
	    ;;
	--disable-default-environ)
	    environ_default=no
	    ;;
	--help)
	    usage
	    ;;
	*)
	    usage
	    ;;
    esac
done

arch_name=$arch
[ "$arch" = "aarch64" ] && arch="arm64"
[ "$arch_name" = "arm64" ] && arch_name="aarch64"

[ -z "$processor" ] && processor="$arch"

if [ "$processor" = "arm64" ]; then
    processor="cortex-a57"
elif [ "$processor" = "arm" ]; then
    processor="cortex-a15"
fi

if [ "$arch" = "i386" ] || [ "$arch" = "x86_64" ]; then
    testdir=x86
elif [ "$arch" = "arm" ] || [ "$arch" = "arm64" ]; then
    testdir=arm
elif [ "$arch" = "ppc64" ]; then
    testdir=powerpc
    firmware="$testdir/boot_rom.bin"
    if [ "$endian" != "little" ] && [ "$endian" != "big" ]; then
        echo "You must provide endianness (big or little)!"
        usage
    fi
else
    testdir=$arch
fi
if [ ! -d "$srcdir/$testdir" ]; then
    echo "$testdir does not exist!"
    exit 1
fi
if [ -f "$srcdir/$testdir/run" ]; then
    ln -fs "$srcdir/$testdir/run" $testdir-run
fi

# check if uint32_t needs a long format modifier
cat << EOF > lib-test.c
__UINT32_TYPE__
EOF
u32_long=$("$cross_prefix$cc" -E lib-test.c | grep -v '^#' | grep -q long && echo yes)
rm -f lib-test.c

# api/: check for dependent 32 bit libraries and gnu++11 support
if [ "$testdir" = "x86" ]; then
    echo 'int main () {}' > lib-test.c
    if $cc -m32 -o /dev/null -lstdc++ -lpthread -lrt lib-test.c &> /dev/null &&
       $cxx -m32 -o /dev/null -std=gnu++11 lib-test.c &> /dev/null; then
        api=yes
    fi
    rm -f lib-test.c
fi
if [ "$arch" = "x86_64" ]; then
    gtests=yes
fi

# Are we in a separate build tree? If so, link the Makefile
# and shared stuff so that 'make' and run_tests.sh work.
if test ! -e Makefile; then
    echo "linking Makefile..."
    ln -s "$srcdir/Makefile" .

    echo "linking tests..."
    mkdir -p $testdir
    ln -sf "$srcdir/$testdir/run" $testdir/
    ln -sf "$srcdir/$testdir/unittests.cfg" $testdir/
    ln -sf "$srcdir/run_tests.sh"

    echo "linking scripts..."
    ln -sf "$srcdir/scripts"
fi

# link lib/asm for the architecture
rm -f lib/asm
asm="asm-generic"
if [ -d "$srcdir/lib/$arch/asm" ]; then
	asm="$srcdir/lib/$arch/asm"
elif [ -d "$srcdir/lib/$testdir/asm" ]; then
	asm="$srcdir/lib/$testdir/asm"
fi
mkdir -p lib
ln -sf "$asm" lib/asm


# create the config
cat <<EOF > config.mak
SRCDIR=$srcdir
PREFIX=$prefix
HOST=$host
ARCH=$arch
ARCH_NAME=$arch_name
PROCESSOR=$processor
CC=$cross_prefix$cc
CXX=$cross_prefix$cxx
LD=$cross_prefix$ld
OBJCOPY=$cross_prefix$objcopy
OBJDUMP=$cross_prefix$objdump
AR=$cross_prefix$ar
ADDR2LINE=$cross_prefix$addr2line
API=$api
GTESTS=$gtests
TEST_DIR=$testdir
FIRMWARE=$firmware
ENDIAN=$endian
PRETTY_PRINT_STACKS=$pretty_print_stacks
ENVIRON_DEFAULT=$environ_default
ERRATATXT=errata.txt
U32_LONG_FMT=$u32_long
EOF