#! /usr/bin/env bash
# Copyright (C) 2016 Sebastian Pipping <sebastian@pipping.org>
# Licensed under MIT license

set -e
set -o nounset


ANNOUNCE() {
    local open='\e[1m'
    local close='\e[0m'

    echo -e -n "${open}" >&2
    echo -n "# $*" >&2
    echo -e "${close}" >&2
}


WARNING() {
    local open='\e[1;33m'
    local close='\e[0m'

    echo -e -n "${open}" >&2
    echo -n "WARNING: $*" >&2
    echo -e "${close}" >&2
}


RUN() {
    ANNOUNCE "$@"
    env "$@"
}


populate_environment() {
    : ${LD:=ld}
    : ${MAKE:=make}

    case "${QA_COMPILER}" in
        clang)
            : ${CC:=clang}
            : ${CXX:=clang++}
            ;;
        gcc)
            : ${CC:=gcc}
            : ${CXX:=g++}
            ;;
    esac

    : ${BASE_COMPILE_FLAGS:="-pipe -Wall -Wextra -pedantic -Wno-overlength-strings -Wno-long-long"}
    : ${BASE_LINK_FLAGS:=}

    if [[ ${QA_COMPILER} = clang ]]; then
        case "${QA_SANITIZER}" in
            address)
                # http://clang.llvm.org/docs/AddressSanitizer.html
                BASE_COMPILE_FLAGS+=" -g -fsanitize=address -fno-omit-frame-pointer"
                BASE_LINK_FLAGS+=" -g -Wc,-fsanitize=address"  # "-Wc," is for libtool
                ;;
            memory)
                # http://clang.llvm.org/docs/MemorySanitizer.html
                BASE_COMPILE_FLAGS+=" -fsanitize=memory -fno-omit-frame-pointer -g -O2 -fsanitize-memory-track-origins -fsanitize-blacklist=$PWD/memory-sanitizer-blacklist.txt"
                ;;
            undefined)
                # http://clang.llvm.org/docs/UndefinedBehaviorSanitizer.html
                BASE_COMPILE_FLAGS+=" -fsanitize=undefined"
                export UBSAN_OPTIONS=print_stacktrace=1
                ;;
        esac
    fi


    if [[ ${QA_COMPILER} = gcc ]]; then
        case "${QA_PROCESSOR}" in
            egypt) BASE_COMPILE_FLAGS+=" -fdump-rtl-expand" ;;
            gcov) BASE_COMPILE_FLAGS+=" --coverage -O0" ;;
        esac
    fi


    CFLAGS="-std=c99 ${BASE_COMPILE_FLAGS} ${CFLAGS:-}"
    CXXFLAGS="-std=c++98 ${BASE_COMPILE_FLAGS} ${CXXFLAGS:-}"
    LDFLAGS="${BASE_LINK_FLAGS} ${LDFLAGS:-}"
}


run_configure() {
    RUN CC="${CC}" CFLAGS="${CFLAGS}" \
            CXX="${CXX}" CXXFLAGS="${CXXFLAGS}" \
            LD="${LD}" LDFLAGS="${LDFLAGS}" \
            ./configure "$@" \
        || { RUN cat config.log ; false ; }
}


run_compile() {
    RUN "${MAKE}" \
            CFLAGS="${CFLAGS} -Werror" \
            CXXFLAGS="${CXXFLAGS} -Werror" \
            clean all
}


run_tests() {
    case "${QA_PROCESSOR}" in
        egypt) return 0 ;;
    esac

    RUN "${MAKE}" \
            CFLAGS="${CFLAGS} -Werror" \
            CXXFLAGS="${CXXFLAGS} -Werror" \
            check run-xmltest
}


run_processor() {
    if [[ ${QA_COMPILER} != gcc ]]; then
        return 0
    fi

    case "${QA_PROCESSOR}" in
    egypt)
        local DOT_FORMAT="${DOT_FORMAT:-svg}"
        local o="callgraph.${DOT_FORMAT}"
        ANNOUNCE "egypt ...... | dot ...... > ${o}"
        find -name '*.expand' \
                | sort \
                | xargs -r egypt \
                | unflatten -c 20 \
                | dot -T${DOT_FORMAT} -Grankdir=LR \
                > "${o}"
        ;;
    gcov)
        for gcov_dir in lib xmlwf ; do
        (
            cd "${gcov_dir}" || exit 1
            for gcda_file in $(find . -name '*.gcda' | sort) ; do
                RUN gcov -s .libs/ ${gcda_file}
            done
        )
        done

        RUN find -name '*.gcov' | sort
        ;;
    esac
}


run() {
    populate_environment
    dump_config

    run_configure
    run_compile
    run_tests
    run_processor
}


dump_config() {
    cat <<EOF
Configuration:
  QA_COMPILER=${QA_COMPILER}
  QA_PROCESSOR=${QA_PROCESSOR}  # GCC only
  QA_SANITIZER=${QA_SANITIZER}  # Clang only

  CFLAGS=${CFLAGS}
  CXXFLAGS=${CXXFLAGS}
  LDFLAGS=${LDFLAGS}

  CC=${CC}
  CXX=${CXX}
  LD=${LD}
  MAKE=${MAKE}

EOF
}


process_config() {
    case "${QA_COMPILER:=gcc}" in
        clang|gcc) ;;
        *) usage; exit 1 ;;
    esac


    if [[ ${QA_COMPILER} != gcc && -n ${QA_PROCESSOR:-} ]]; then
        WARNING "QA_COMPILER=${QA_COMPILER} is not 'gcc' -- ignoring QA_PROCESSOR=${QA_PROCESSOR}"
    fi

    case "${QA_PROCESSOR:=gcov}" in
        egypt|gcov) ;;
        *) usage; exit 1 ;;
    esac


    if [[ ${QA_COMPILER} != clang && -n ${QA_SANITIZER:-} ]]; then
        WARNING "QA_COMPILER=${QA_COMPILER} is not 'clang' -- ignoring QA_SANITIZER=${QA_SANITIZER}" >&2
    fi

    case "${QA_SANITIZER:=address}" in
        address|memory|undefined) ;;
        *) usage; exit 1 ;;
    esac
}


usage() {
    cat <<"EOF"
Usage:
  $ ./qa.sh [ARG ..]

Environment variables
  QA_COMPILER=(clang|gcc)                  # default: gcc
  QA_PROCESSOR=(egypt|gcov)                # default: gcov
  QA_SANITIZER=(address|memory|undefined)  # default: address

EOF
}


main() {
    if [[ ${1:-} = --help ]]; then
        usage; exit 0
    fi

    process_config

    run
}


main "$@"