#!/bin/bash
#-------------------------------------------------------------------------------------------------------
# Copyright (C) Microsoft. All rights reserved.
# Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
#-------------------------------------------------------------------------------------------------------

LLVM_VERSION="5.0.0"
DEFAULT_COLOR='\033[0m'
ERROR_COLOR='\033[0;31m'
GREEN_COLOR='\033[0;32m'

CC_URL="git://sourceware.org/git/binutils-gdb.git\nhttp://llvm.org/releases/${LLVM_VERSION}/\n"

if [[ $1 == '-y' || $1 == '-Y' ]]; then
    ALWAYS_YES=1
fi

WARN_LICENSE () {
    echo -e "${ERROR_COLOR}"
    echo -e "----------------------------------------------------------------"
    echo -e "${DEFAULT_COLOR}"
    echo -e "This script will download LLVM/CLANG and LLVM Gold Bintools from\n${CC_URL}\n"
    echo "These software are licensed to you by its publisher(s), not Microsoft."
    echo "Microsoft is not responsible for the software."
    echo "Your installation and use of the software is subject to the publisher's terms available here:"
    echo -e "http://llvm.org/docs/DeveloperPolicy.html#license\nhttp://llvm.org/docs/GoldPlugin.html#licensing"
    echo -e "${ERROR_COLOR}"
    echo -e "----------------------------------------------------------------\n"
    echo -e "${GREEN_COLOR}If you don't agree, press Ctrl+C to terminate${DEFAULT_COLOR}"
    WAIT_QUESTION="Hit ENTER to continue (or wait 20 seconds)"
    if [[ $ALWAYS_YES == 1 ]]; then
        echo "$WAIT_QUESTION : Y"
    else
        read -t 20 -p "$WAIT_QUESTION"
    fi

    echo -e "\nWell, this will take some time... [and free memory 2GB+]\n"
}

WARN_PACKAGE () {
    echo -e "\n${GREEN_COLOR}"
    echo -e "----------------------------------------------------------------${DEFAULT_COLOR}"
    echo "This script requires (texinfo texi2html csh gawk automake libtool libtool-bin bison flex ncurses-devel)"
    echo "Automated installation of these requirements is supported with apt-get and yum only."
    echo ""
    echo "If you don't have these packages are installed, press Ctrl+C to terminate"
    echo -e "${GREEN_COLOR}----------------------------------------------------------------"
    echo -e "${DEFAULT_COLOR}"
    WAIT_QUESTION="Hit ENTER to continue (or wait 20 seconds)"
    if [[ $ALWAYS_YES == 1 ]]; then
        echo "$WAIT_QUESTION : Y"
    else
        read -t 20 -p "$WAIT_QUESTION"
    fi
}

DOWNLOAD_HELPER() {
    WGET_CTR=1
    while [ 1 ]; do
        wget --no-dns-cache --tries=3 --retry-connrefused --waitretry=3 $1 >/dev/null 2>&1
        if [[ $? == 0 ]]; then
            break;
        else
            if [[ $WGET_CTR == 3 ]]; then
              echo "Failed to download $1"
              exit 1
            fi
            WGET_CTR=$(($WGET_CTR + 1))
            echo "${WGET_CTR}. try...."
        fi
    done;
}

ROOT=${PWD}/cc-toolchain/
GOLD_PLUGIN=""

if [ ! -d ./cc-toolchain/src/llvm/projects/compiler-rt ]; then
    rm -rf cc-toolchain
    mkdir cc-toolchain
    cd cc-toolchain
    mkdir src
    mkdir bin
    cd src

    if [[ "$OSTYPE" =~ "darwin" ]]; then # osx
        echo "This script is not prepared for OSX"
        exit 0
    else
        WARN_LICENSE

        apt-get -v >/dev/null 2>&1
        if [ $? == 0 ]; then # debian
            apt-get install -y apt-file texinfo texi2html csh gawk automake libtool \
              libtool-bin bison flex libncurses5-dev
            if [ $? != 0 ]; then
                WARN_PACKAGE
            fi
        else
            yum -v >/dev/null 2>&1
            if [ $? == 0 ]; then # redhat
                yum install -y texinfo texi2html csh gawk automake libtool libtool-bin bison flex ncurses-devel
            else
                WARN_PACKAGE
            fi
        fi
    fi

    mkdir lto_utils
    cd lto_utils
    echo "Downloading LLVM Gold Plugin"
    git clone --depth 1 git://sourceware.org/git/binutils-gdb.git binutils >/dev/null 2>&1
    mkdir binutils_compile; cd binutils_compile
    LD_LIBRARY_PATH="${LD_LIBRARY_PATH}:${ROOT}/build/lib/"
    ../binutils/configure --enable-gold --enable-plugins --disable-werror --prefix="${ROOT}/build"
    make -j4
    make install
    if [ $? != 0 ]; then
        exit 1
    fi

    echo -e "\n\n\n\n"
    cd "${ROOT}/src/"

    echo "Downloading LLVM ${LLVM_VERSION}"
    DOWNLOAD_HELPER "http://llvm.org/releases/${LLVM_VERSION}/llvm-${LLVM_VERSION}.src.tar.xz"

    tar xf "llvm-${LLVM_VERSION}.src.tar.xz"
    if [ $? == 0 ]; then
        rm "llvm-${LLVM_VERSION}.src.tar.xz"
        mv "llvm-${LLVM_VERSION}.src" llvm
    else
        exit 1
    fi

    cd llvm/tools/
    echo "Downloading Clang ${LLVM_VERSION}"
    DOWNLOAD_HELPER "http://llvm.org/releases/${LLVM_VERSION}/cfe-${LLVM_VERSION}.src.tar.xz"

    tar xf "cfe-${LLVM_VERSION}.src.tar.xz"
    if [ $? == 0 ]; then
        mv "cfe-${LLVM_VERSION}.src" clang
        rm "cfe-${LLVM_VERSION}.src.tar.xz"
    else
        exit 1
    fi

    mkdir -p ../projects/
    cd ../projects/
    echo "Downloading Compiler-RT ${LLVM_VERSION}"
    DOWNLOAD_HELPER "http://llvm.org/releases/${LLVM_VERSION}/compiler-rt-${LLVM_VERSION}.src.tar.xz"

    tar xf "compiler-rt-${LLVM_VERSION}.src.tar.xz"
    if [ $? == 0 ]; then
        mv "compiler-rt-${LLVM_VERSION}.src" compiler-rt
        rm "compiler-rt-${LLVM_VERSION}.src.tar.xz"
    else
        exit 1
    fi
fi

GOLD_PLUGIN=-DLLVM_BINUTILS_INCDIR="${ROOT}/src/lto_utils/binutils/include"

mkdir -p "${ROOT}/build"
cd "${ROOT}/src/llvm"
mkdir -p build_
cd build_

cmake ../ -DCMAKE_INSTALL_PREFIX="${ROOT}/build" -DCMAKE_BUILD_TYPE=Release ${GOLD_PLUGIN}

if [ $? != 0 ]; then
    cd ..
    rm -rf build_
    mkdir build_
    exit 1
fi

make -j4 install

if [ $? == 0 ]; then
    echo -e "Done!\n./build.sh args are given below;\n\n"
    # Create a local bfd-plugins and copy LLVMgold.so into there.
    mkdir -p "${ROOT}/build/lib/bfd-plugins/"
    cp "${ROOT}/build/lib/LLVMgold.so" "${ROOT}/build/lib/bfd-plugins/"
    echo "--cxx=${ROOT}/build/bin/clang++ --cc=${ROOT}/build/bin/clang"
fi