# Copyright 1999-2021 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI="7"

# Patch version
FIREFOX_PATCHSET="firefox-78esr-patches-18.tar.xz"
SPIDERMONKEY_PATCHSET="spidermonkey-78-patches-04.tar.xz"

LLVM_MAX_SLOT=12

PYTHON_COMPAT=( python3_{7..9} )

WANT_AUTOCONF="2.1"

inherit autotools check-reqs flag-o-matic llvm multiprocessing prefix python-any-r1 toolchain-funcs

MY_PN="mozjs"
MY_PV="${PV/_pre*}" # Handle Gentoo pre-releases

MY_MAJOR=$(ver_cut 1)

MOZ_ESR=yes

MOZ_PV=${PV}
MOZ_PV_SUFFIX=
if [[ ${PV} =~ (_(alpha|beta|rc).*)$ ]] ; then
	MOZ_PV_SUFFIX=${BASH_REMATCH[1]}

	# Convert the ebuild version to the upstream Mozilla version
	MOZ_PV="${MOZ_PV/_alpha/a}" # Handle alpha for SRC_URI
	MOZ_PV="${MOZ_PV/_beta/b}"  # Handle beta for SRC_URI
	MOZ_PV="${MOZ_PV%%_rc*}"    # Handle rc for SRC_URI
fi

if [[ -n ${MOZ_ESR} ]] ; then
	# ESR releases have slightly different version numbers
	MOZ_PV="${MOZ_PV}esr"
fi

MOZ_PN="firefox"
MOZ_P="${MOZ_PN}-${MOZ_PV}"
MOZ_PV_DISTFILES="${MOZ_PV}${MOZ_PV_SUFFIX}"
MOZ_P_DISTFILES="${MOZ_PN}-${MOZ_PV_DISTFILES}"

MOZ_SRC_BASE_URI="https://archive.mozilla.org/pub/${MOZ_PN}/releases/${MOZ_PV}"

if [[ ${PV} == *_rc* ]] ; then
	MOZ_SRC_BASE_URI="https://archive.mozilla.org/pub/${MOZ_PN}/candidates/${MOZ_PV}-candidates/build${PV##*_rc}"
fi

PATCH_URIS=(
	https://dev.gentoo.org/~{whissi,polynomial-c,axs}/mozilla/patchsets/${FIREFOX_PATCHSET}
	https://dev.gentoo.org/~{whissi,polynomial-c,axs}/mozilla/patchsets/${SPIDERMONKEY_PATCHSET}
)

SRC_URI="${MOZ_SRC_BASE_URI}/source/${MOZ_P}.source.tar.xz -> ${MOZ_P_DISTFILES}.source.tar.xz
	${PATCH_URIS[@]}"

DESCRIPTION="SpiderMonkey is Mozilla's JavaScript engine written in C and C++"
HOMEPAGE="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonkey"

KEYWORDS="~amd64 ~arm ~arm64 ~mips ~ppc64 ~riscv ~s390 ~x86"

SLOT="78"
LICENSE="MPL-2.0"
IUSE="clang cpu_flags_arm_neon debug +jit lto test"

RESTRICT="!test? ( test )"

BDEPEND="${PYTHON_DEPS}
	>=virtual/rust-1.41.0
	virtual/pkgconfig
	|| (
		(
			sys-devel/llvm:12
			clang? (
				sys-devel/clang:12
				lto? ( =sys-devel/lld-12* )
			)
		)
		(
			sys-devel/llvm:11
			clang? (
				sys-devel/clang:11
				lto? ( =sys-devel/lld-11* )
			)
		)
		(
			sys-devel/llvm:10
			clang? (
				sys-devel/clang:10
				lto? ( =sys-devel/lld-10* )
			)
		)
	)
	lto? (
		!clang? ( sys-devel/binutils[gold] )
	)"

CDEPEND=">=dev-libs/icu-67.1:=
	>=dev-libs/nspr-4.25
	sys-libs/readline:0=
	>=sys-libs/zlib-1.2.3"

DEPEND="${CDEPEND}
	test? (
		$(python_gen_any_dep 'dev-python/six[${PYTHON_USEDEP}]')
	)"

RDEPEND="${CDEPEND}"

S="${WORKDIR}/firefox-${MY_PV}/js/src"

llvm_check_deps() {
	if ! has_version -b "sys-devel/llvm:${LLVM_SLOT}" ; then
		einfo "sys-devel/llvm:${LLVM_SLOT} is missing! Cannot use LLVM slot ${LLVM_SLOT} ..." >&2
		return 1
	fi

	if use clang ; then
		if ! has_version -b "sys-devel/clang:${LLVM_SLOT}" ; then
			einfo "sys-devel/clang:${LLVM_SLOT} is missing! Cannot use LLVM slot ${LLVM_SLOT} ..." >&2
			return 1
		fi

		if use lto ; then
			if ! has_version -b "=sys-devel/lld-${LLVM_SLOT}*" ; then
				einfo "=sys-devel/lld-${LLVM_SLOT}* is missing! Cannot use LLVM slot ${LLVM_SLOT} ..." >&2
				return 1
			fi
		fi
	fi

	einfo "Using LLVM slot ${LLVM_SLOT} to build" >&2
}

python_check_deps() {
	if use test ; then
		has_version "dev-python/six[${PYTHON_USEDEP}]"
	fi
}

pkg_pretend() {
	if use test ; then
		CHECKREQS_DISK_BUILD="7600M"
	else
		CHECKREQS_DISK_BUILD="6400M"
	fi

	check-reqs_pkg_pretend
}

pkg_setup() {
	if [[ ${MERGE_TYPE} != binary ]] ; then
		if use test ; then
			CHECKREQS_DISK_BUILD="7600M"
		else
			CHECKREQS_DISK_BUILD="6400M"
		fi

		check-reqs_pkg_setup

		llvm_pkg_setup

		if use clang && use lto ; then
			local version_lld=$(ld.lld --version 2>/dev/null | awk '{ print $2 }')
			[[ -n ${version_lld} ]] && version_lld=$(ver_cut 1 "${version_lld}")
			[[ -z ${version_lld} ]] && die "Failed to read ld.lld version!"

			# temp fix for https://bugs.gentoo.org/768543
			# we can assume that rust 1.{49,50}.0 always uses llvm 11
			local version_rust=$(rustc -Vv 2>/dev/null | grep -F -- 'release:' | awk '{ print $2 }')
			[[ -n ${version_rust} ]] && version_rust=$(ver_cut 1-2 "${version_rust}")
			[[ -z ${version_rust} ]] && die "Failed to read version from rustc!"

			if ver_test "${version_rust}" -ge "1.49" && ver_test "${version_rust}" -le "1.50" ; then
				local version_llvm_rust="11"
			else
				local version_llvm_rust=$(rustc -Vv 2>/dev/null | grep -F -- 'LLVM version:' | awk '{ print $3 }')
				[[ -n ${version_llvm_rust} ]] && version_llvm_rust=$(ver_cut 1 "${version_llvm_rust}")
				[[ -z ${version_llvm_rust} ]] && die "Failed to read used LLVM version from rustc!"
			fi

			if ver_test "${version_lld}" -ne "${version_llvm_rust}" ; then
				eerror "Rust is using LLVM version ${version_llvm_rust} but ld.lld version belongs to LLVM version ${version_lld}."
				eerror "You will be unable to link ${CATEGORY}/${PN}. To proceed you have the following options:"
				eerror "  - Manually switch rust version using 'eselect rust' to match used LLVM version"
				eerror "  - Switch to dev-lang/rust[system-llvm] which will guarantee matching version"
				eerror "  - Build ${CATEGORY}/${PN} without USE=lto"
				die "LLVM version used by Rust (${version_llvm_rust}) does not match with ld.lld version (${version_lld})!"
			fi
		fi

		python-any-r1_pkg_setup

		# Build system is using /proc/self/oom_score_adj, bug #604394
		addpredict /proc/self/oom_score_adj

		if ! mountpoint -q /dev/shm ; then
			# If /dev/shm is not available, configure is known to fail with
			# a traceback report referencing /usr/lib/pythonN.N/multiprocessing/synchronize.py
			ewarn "/dev/shm is not mounted -- expect build failures!"
		fi

		# Ensure we use C locale when building, bug #746215
		export LC_ALL=C
	fi
}

src_prepare() {
	pushd ../.. &>/dev/null || die

	use lto && rm -v "${WORKDIR}"/firefox-patches/*-LTO-Only-enable-LTO-*.patch

	eapply "${WORKDIR}"/firefox-patches
	eapply "${WORKDIR}"/spidermonkey-patches

	default

	# Make LTO respect MAKEOPTS
	sed -i \
		-e "s/multiprocessing.cpu_count()/$(makeopts_jobs)/" \
		build/moz.configure/lto-pgo.configure \
		|| die "sed failed to set num_cores"

	# sed-in toolchain prefix
	sed -i \
		-e "s/objdump/${CHOST}-objdump/" \
		python/mozbuild/mozbuild/configure/check_debug_ranges.py \
		|| die "sed failed to set toolchain prefix"

	# use prefix shell in wrapper linker scripts, bug #789660
	hprefixify "${S}"/../../build/cargo-{,host-}linker

	einfo "Removing pre-built binaries ..."
	find third_party -type f \( -name '*.so' -o -name '*.o' \) -print -delete || die

	MOZJS_BUILDDIR="${WORKDIR}/build"
	mkdir "${MOZJS_BUILDDIR}" || die

	popd &>/dev/null || die
	eautoconf
}

src_configure() {
	# Show flags set at the beginning
	einfo "Current CFLAGS:    ${CFLAGS}"
	einfo "Current CXXFLAGS:  ${CXXFLAGS}"
	einfo "Current LDFLAGS:   ${LDFLAGS}"
	einfo "Current RUSTFLAGS: ${RUSTFLAGS}"

	local have_switched_compiler=
	if use clang && ! tc-is-clang ; then
		# Force clang
		einfo "Enforcing the use of clang due to USE=clang ..."
		have_switched_compiler=yes
		AR=llvm-ar
		CC=${CHOST}-clang
		CXX=${CHOST}-clang++
		NM=llvm-nm
		RANLIB=llvm-ranlib
	elif ! use clang && ! tc-is-gcc ; then
		# Force gcc
		have_switched_compiler=yes
		einfo "Enforcing the use of gcc due to USE=-clang ..."
		AR=gcc-ar
		CC=${CHOST}-gcc
		CXX=${CHOST}-g++
		NM=gcc-nm
		RANLIB=gcc-ranlib
	fi

	if [[ -n "${have_switched_compiler}" ]] ; then
		# Because we switched active compiler we have to ensure
		# that no unsupported flags are set
		strip-unsupported-flags
	fi

	# Ensure we use correct toolchain
	export HOST_CC="$(tc-getBUILD_CC)"
	export HOST_CXX="$(tc-getBUILD_CXX)"
	tc-export CC CXX LD AR NM OBJDUMP RANLIB PKG_CONFIG

	cd "${MOZJS_BUILDDIR}" || die

	# ../python/mach/mach/mixin/process.py fails to detect SHELL
	export SHELL="${EPREFIX}/bin/bash"

	local -a myeconfargs=(
		--host="${CBUILD:-${CHOST}}"
		--target="${CHOST}"
		--disable-jemalloc
		--disable-optimize
		--disable-strip
		--enable-readline
		--enable-shared-js
		--with-intl-api
		--with-system-icu
		--with-system-nspr
		--with-system-zlib
		--with-toolchain-prefix="${CHOST}-"
		$(use_enable debug)
		$(use_enable jit)
		$(use_enable test tests)
	)

	if ! use x86 && [[ ${CHOST} != armv*h* ]] ; then
		myeconfargs+=( --enable-rust-simd )
	fi

	# Modifications to better support ARM, bug 717344
	if use cpu_flags_arm_neon ; then
		myeconfargs+=( --with-fpu=neon )

		if ! tc-is-clang ; then
			# thumb options aren't supported when using clang, bug 666966
			myeconfargs+=( --with-thumb=yes )
			myeconfargs+=( --with-thumb-interwork=no )
		fi
	fi

	# Tell build system that we want to use LTO
	if use lto ; then
		myeconfargs+=( --enable-lto )

		if use clang ; then
			myeconfargs+=( --enable-linker=lld )
		else
			myeconfargs+=( --enable-linker=gold )
		fi
	fi

	# LTO flag was handled via configure
	filter-flags '-flto*'

	if tc-is-gcc ; then
		if ver_test $(gcc-fullversion) -ge 10 ; then
			einfo "Forcing -fno-tree-loop-vectorize to workaround GCC bug, see bug 758446 ..."
			append-cxxflags -fno-tree-loop-vectorize
		fi
	fi

	# Show flags we will use
	einfo "Build CFLAGS:    ${CFLAGS}"
	einfo "Build CXXFLAGS:  ${CXXFLAGS}"
	einfo "Build LDFLAGS:   ${LDFLAGS}"
	einfo "Build RUSTFLAGS: ${RUSTFLAGS}"

	# Forcing system-icu allows us to skip patching bundled ICU for PPC
	# and other minor arches
	ECONF_SOURCE="${S}" \
		econf \
		${myeconfargs[@]} \
		XARGS="${EPREFIX}/usr/bin/xargs"
}

src_compile() {
	cd "${MOZJS_BUILDDIR}" || die
	default
}

src_test() {
	if "${MOZJS_BUILDDIR}/js/src/js" -e 'print("Hello world!")'; then
		einfo "Smoke-test successful, continuing with full test suite"
	else
		die "Smoke-test failed: did interpreter initialization fail?"
	fi

	local -a KNOWN_TESTFAILURES
	KNOWN_TESTFAILURES+=( non262/Date/reset-time-zone-cache-same-offset.js )
	KNOWN_TESTFAILURES+=( non262/Date/time-zone-path.js )
	KNOWN_TESTFAILURES+=( non262/Date/time-zones-historic.js )
	KNOWN_TESTFAILURES+=( non262/Date/time-zones-imported.js )
	KNOWN_TESTFAILURES+=( non262/Date/toString-localized.js )
	KNOWN_TESTFAILURES+=( non262/Date/toString-localized-posix.js )
	KNOWN_TESTFAILURES+=( non262/Intl/Date/toLocaleString_timeZone.js )
	KNOWN_TESTFAILURES+=( non262/Intl/Date/toLocaleDateString_timeZone.js )
	KNOWN_TESTFAILURES+=( non262/Intl/DateTimeFormat/format.js )
	KNOWN_TESTFAILURES+=( non262/Intl/DateTimeFormat/format_timeZone.js )
	KNOWN_TESTFAILURES+=( non262/Intl/DateTimeFormat/timeZone_backward_links.js )
	KNOWN_TESTFAILURES+=( non262/Intl/DateTimeFormat/tz-environment-variable.js )
	KNOWN_TESTFAILURES+=( non262/Intl/DisplayNames/language.js )
	KNOWN_TESTFAILURES+=( non262/Intl/DisplayNames/region.js )
	KNOWN_TESTFAILURES+=( non262/Intl/Locale/likely-subtags.js )
	KNOWN_TESTFAILURES+=( non262/Intl/Locale/likely-subtags-generated.js )
	KNOWN_TESTFAILURES+=( test262/intl402/Locale/prototype/minimize/removing-likely-subtags-first-adds-likely-subtags.js )

	if use x86 ; then
		KNOWN_TESTFAILURES+=( non262/Date/timeclip.js )
		KNOWN_TESTFAILURES+=( test262/built-ins/Number/prototype/toPrecision/return-values.js )
		KNOWN_TESTFAILURES+=( test262/language/types/number/S8.5_A2.1.js )
		KNOWN_TESTFAILURES+=( test262/language/types/number/S8.5_A2.2.js )
	fi

	if [[ $(tc-endian) == "big" ]] ; then
		KNOWN_TESTFAILURES+=( test262/built-ins/TypedArray/prototype/set/typedarray-arg-set-values-same-buffer-other-type.js )
	fi

	echo "" > "${T}"/known_failures.list || die

	local KNOWN_TESTFAILURE
	for KNOWN_TESTFAILURE in ${KNOWN_TESTFAILURES[@]} ; do
		echo "${KNOWN_TESTFAILURE}" >> "${T}"/known_failures.list
	done

	PYTHONPATH="${S}/tests/lib" \
		${PYTHON} \
		"${S}"/tests/jstests.py -d -s -t 1800 --wpt=disabled --no-progress \
		--exclude-file="${T}"/known_failures.list \
		"${MOZJS_BUILDDIR}"/js/src/js \
		|| die

	if use jit ; then
		KNOWN_TESTFAILURES=()

		echo "" > "${T}"/known_failures.list || die

		for KNOWN_TESTFAILURE in ${KNOWN_TESTFAILURES[@]} ; do
			echo "${KNOWN_TESTFAILURE}" >> "${T}"/known_failures.list
		done

		PYTHONPATH="${S}/tests/lib" \
			${PYTHON} \
			"${S}"/tests/jstests.py -d -s -t 1800 --wpt=disabled --no-progress \
			--exclude-file="${T}"/known_failures.list \
			"${MOZJS_BUILDDIR}"/js/src/js basic \
			|| die
	fi
}

src_install() {
	cd "${MOZJS_BUILDDIR}" || die
	default

	# fix soname links
	pushd "${ED}"/usr/$(get_libdir) &>/dev/null || die
	mv lib${MY_PN}-${MY_MAJOR}.so lib${MY_PN}-${MY_MAJOR}.so.0.0.0 || die
	ln -s lib${MY_PN}-${MY_MAJOR}.so.0.0.0 lib${MY_PN}-${MY_MAJOR}.so.0 || die
	ln -s lib${MY_PN}-${MY_MAJOR}.so.0 lib${MY_PN}-${MY_MAJOR}.so || die
	popd &>/dev/null || die

	# remove unneeded files
	rm \
		"${ED}"/usr/bin/js${MY_MAJOR}-config \
		"${ED}"/usr/$(get_libdir)/libjs_static.ajs \
		|| die

	# fix permissions
	chmod -x \
		"${ED}"/usr/$(get_libdir)/pkgconfig/*.pc \
		"${ED}"/usr/include/mozjs-${MY_MAJOR}/js-config.h \
		|| die
}