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# Copyright 2015 the V8 project authors. All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import("//build/config/v8_target_cpu.gni")
declare_args() {
# The v8 snapshot needs to be built by code that is compiled with a
# toolchain that matches the bit-width of the target CPU, but runs on
# the host.
v8_snapshot_toolchain = ""
}
# Try to infer the appropriate snapshot toolchain for the v8_current_cpu
# where possible.
#
# Assume that v8_target_cpu (and hence v8_current_cpu) has been validated
# as supported on the current host CPU and OS in v8_target_cpu.gni. The
# logic below is complicated enough without also needing to do input
# validation.
#
# There are test cases for this code posted as an attachment to
# https://crbug.com/625353.
#
# TODO(GYP): Currently only regular (non-cross) compiles, and cross-compiles
# from x64 hosts to Intel, ARM, or MIPS targets, are implemented. Add support
# for the other supported configurations.
if (v8_snapshot_toolchain == "") {
if (current_os == host_os && current_cpu == host_cpu) {
# This is not a cross-compile, so build the snapshot with the current
# toolchain.
v8_snapshot_toolchain = current_toolchain
} else if (current_os == host_os && current_cpu == "x86" &&
host_cpu == "x64") {
# This is an x64 -> x86 cross-compile, but x64 hosts can usually run x86
# binaries built for the same OS, so build the snapshot with the current
# toolchain here, too.
v8_snapshot_toolchain = current_toolchain
} else if (current_os == host_os && host_cpu == "arm64" &&
current_cpu == "arm") {
# Trying to compile 32-bit arm on arm64. Good luck!
v8_snapshot_toolchain = current_toolchain
} else if (host_cpu == "x64" &&
(v8_current_cpu == "mips" || v8_current_cpu == "mips64")) {
# We don't support snapshot generation for big-endian targets,
# therefore snapshots will need to be built using native mksnapshot
# in combination with qemu
v8_snapshot_toolchain = current_toolchain
} else if (host_cpu == "x64") {
# This is a cross-compile from an x64 host to either a non-Intel target
# cpu or a different target OS. Clang will always be used by default on the
# host, unless this is a ChromeOS build, in which case the same toolchain
# (Clang or GCC) will be used for target and host by default.
if (is_chromeos && !is_clang) {
_clang = ""
} else {
_clang = "clang_"
}
if (v8_current_cpu == "x64" || v8_current_cpu == "x86") {
_cpus = v8_current_cpu
} else if (v8_current_cpu == "arm64" || v8_current_cpu == "mips64el" ||
v8_current_cpu == "riscv64") {
if (is_win && v8_current_cpu == "arm64") {
# set _cpus to blank for Windows ARM64 so host_toolchain could be
# selected as snapshot toolchain later.
_cpus = ""
} else {
_cpus = "x64_v8_${v8_current_cpu}"
}
} else if (v8_current_cpu == "arm" || v8_current_cpu == "mipsel") {
_cpus = "x86_v8_${v8_current_cpu}"
} else {
# This branch should not be reached; leave _cpus blank so the assert
# below will fail.
_cpus = ""
}
if (_cpus != "") {
v8_snapshot_toolchain = "//build/toolchain/${host_os}:${_clang}${_cpus}"
} else if (is_win && v8_current_cpu == "arm64") {
# cross compile Windows arm64 with host toolchain.
v8_snapshot_toolchain = host_toolchain
}
}
}
assert(v8_snapshot_toolchain != "",
"Do not know how to build a snapshot for $current_toolchain " +
"on $host_os $host_cpu")
# We reuse the snapshot toolchain for building torque and other generators to
# avoid building v8_libbase on the host more than once. On mips with big endian,
# the snapshot toolchain is the target toolchain and, hence, can't be used.
v8_generator_toolchain = v8_snapshot_toolchain
if (host_cpu == "x64" &&
(v8_current_cpu == "mips" || v8_current_cpu == "mips64")) {
v8_generator_toolchain = "//build/toolchain/linux:clang_x64"
}
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