#!/usr/bin/env bash
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
################################################################################
#
# This script builds NSS with gyp and ninja.
#
# This build system is still under development.  It does not yet support all
# the features or platforms that NSS supports.

set -e

cwd=$(cd $(dirname $0); pwd -P)
source "$cwd"/coreconf/nspr.sh
source "$cwd"/coreconf/sanitizers.sh

# Usage info
show_help()
{
    cat "$cwd"/help.txt
}

run_verbose()
{
    if [ "$verbose" = 1 ]; then
        echo "$@"
        exec 3>&1
    else
        exec 3>/dev/null
    fi
    "$@" 1>&3 2>&3
    exec 3>&-
}

if [ -n "$CCC" ] && [ -z "$CXX" ]; then
    export CXX="$CCC"
fi

opt_build=0
build_64=0
clean=0
rebuild_gyp=0
rebuild_nspr=0
target=Debug
verbose=0
fuzz=0
fuzz_tls=0
fuzz_oss=0
no_local_nspr=0
armhf=0

gyp_params=(--depth="$cwd" --generator-output=".")
nspr_params=()
ninja_params=()

# try to guess sensible defaults
arch=$(python "$cwd"/coreconf/detect_host_arch.py)
if [ "$arch" = "x64" -o "$arch" = "aarch64" ]; then
    build_64=1
elif [ "$arch" = "arm" ]; then
    armhf=1
fi

# parse command line arguments
while [ $# -gt 0 ]; do
    case $1 in
        -c) clean=1 ;;
        --gyp|-g) rebuild_gyp=1 ;;
        --nspr) nspr_clean; rebuild_nspr=1 ;;
        -j) ninja_params+=(-j "$2"); shift ;;
        -v) ninja_params+=(-v); verbose=1 ;;
        --test) gyp_params+=(-Dtest_build=1) ;;
        --fuzz) fuzz=1 ;;
        --fuzz=oss) fuzz=1; fuzz_oss=1 ;;
        --fuzz=tls) fuzz=1; fuzz_tls=1 ;;
        --scan-build) enable_scanbuild  ;;
        --scan-build=?*) enable_scanbuild "${1#*=}" ;;
        --opt|-o) opt_build=1 ;;
        -m32|--m32) build_64=0 ;;
        --asan) enable_sanitizer asan ;;
        --msan) enable_sanitizer msan ;;
        --ubsan) enable_ubsan ;;
        --ubsan=?*) enable_ubsan "${1#*=}" ;;
        --sancov) enable_sancov ;;
        --sancov=?*) enable_sancov "${1#*=}" ;;
        --pprof) gyp_params+=(-Duse_pprof=1) ;;
        --ct-verif) gyp_params+=(-Dct_verif=1) ;;
        --disable-tests) gyp_params+=(-Ddisable_tests=1) ;;
        --no-zdefs) gyp_params+=(-Dno_zdefs=1) ;;
        --system-sqlite) gyp_params+=(-Duse_system_sqlite=1) ;;
        --with-nspr=?*) set_nspr_path "${1#*=}"; no_local_nspr=1 ;;
        --system-nspr) set_nspr_path "/usr/include/nspr/:"; no_local_nspr=1 ;;
        *) show_help; exit 2 ;;
    esac
    shift
done

if [ "$opt_build" = 1 ]; then
    target=Release
else
    target=Debug
fi
if [ "$build_64" = 1 ]; then
    nspr_params+=(--enable-64bit)
elif [ ! "$armhf" = 1 ]; then
    gyp_params+=(-Dtarget_arch=ia32)
fi
if [ "$fuzz" = 1 ]; then
    source "$cwd"/coreconf/fuzz.sh
fi

# set paths
target_dir="$cwd"/out/$target
mkdir -p "$target_dir"
dist_dir="$cwd"/../dist
dist_dir=$(mkdir -p "$dist_dir"; cd "$dist_dir"; pwd -P)
gyp_params+=(-Dnss_dist_dir="$dist_dir")

# -c = clean first
if [ "$clean" = 1 ]; then
    nspr_clean
    rm -rf "$cwd"/out
    rm -rf "$dist_dir"
fi

# This saves a canonical representation of arguments that we are passing to gyp
# or the NSPR build so that we can work out if a rebuild is needed.
# Caveat: This can fail for arguments that are position-dependent.
# e.g., "-e 2 -f 1" and "-e 1 -f 2" canonicalize the same.
check_config()
{
    local newconf="$1".new oldconf="$1"
    shift
    mkdir -p $(dirname "$newconf")
    echo CC="$CC" >"$newconf"
    echo CCC="$CCC" >>"$newconf"
    echo CXX="$CXX" >>"$newconf"
    for i in "$@"; do echo $i; done | sort >>"$newconf"

    # Note: The following diff fails if $oldconf isn't there as well, which
    # happens if we don't have a previous successful build.
    ! diff -q "$newconf" "$oldconf" >/dev/null 2>&1
}

gyp_config="$cwd"/out/gyp_config
nspr_config="$cwd"/out/$target/nspr_config

# If we don't have a build directory make sure that we rebuild.
if [ ! -d "$target_dir" ]; then
    rebuild_nspr=1
    rebuild_gyp=1
elif [ ! -d "$dist_dir"/$target ]; then
    rebuild_nspr=1
fi

# Update NSPR ${C,CXX,LD}FLAGS.
nspr_set_flags $sanitizer_flags

if check_config "$nspr_config" "${nspr_params[@]}" \
                 nspr_cflags="$nspr_cflags" \
                 nspr_cxxflags="$nspr_cxxflags" \
                 nspr_ldflags="$nspr_ldflags"; then
    rebuild_nspr=1
fi

# Forward sanitizer flags.
if [ ! -z "$sanitizer_flags" ]; then
    gyp_params+=(-Dsanitizer_flags="$sanitizer_flags")
fi

if check_config "$gyp_config" "${gyp_params[@]}"; then
    rebuild_gyp=1
fi

# save the chosen target
mkdir -p "$dist_dir"
echo $target > "$dist_dir"/latest

if [[ "$rebuild_nspr" = 1 && "$no_local_nspr" = 0 ]]; then
    nspr_build "${nspr_params[@]}"
    mv -f "$nspr_config".new "$nspr_config"
fi
if [ "$rebuild_gyp" = 1 ]; then
    if ! hash gyp 2> /dev/null; then
        echo "Please install gyp" 1>&2
        exit 1
    fi
    # These extra arguments aren't used in determining whether to rebuild.
    obj_dir="$dist_dir"/$target
    gyp_params+=(-Dnss_dist_obj_dir=$obj_dir)
    if [ "$no_local_nspr" = 0 ]; then
        set_nspr_path "$obj_dir/include/nspr:$obj_dir/lib"
    fi

    run_verbose run_scanbuild gyp -f ninja "${gyp_params[@]}" "$cwd"/nss.gyp

    mv -f "$gyp_config".new "$gyp_config"
fi

# Run ninja.
if hash ninja 2>/dev/null; then
    ninja=ninja
elif hash ninja-build 2>/dev/null; then
    ninja=ninja-build
else
    echo "Please install ninja" 1>&2
    exit 1
fi
run_scanbuild $ninja -C "$target_dir" "${ninja_params[@]}"