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# Copyright 2016 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import("//build/config/sanitizers/sanitizers.gni")
declare_args() {
# This arg is used when we want to tell the JIT-generating v8 code
# that we want to have it generate for an architecture that is different
# than the architecture that v8 will actually run on; we then run the
# code under an emulator. For example, we might run v8 on x86, but
# generate arm code and run that under emulation.
#
# This arg is defined here rather than in the v8 project because we want
# some of the common architecture-specific args (like arm_float_abi or
# mips_arch_variant) to be set to their defaults either if the current_cpu
# applies *or* if the v8_current_cpu applies.
#
# As described below, you can also specify the v8_target_cpu to use
# indirectly by specifying a `custom_toolchain` that contains v8_$cpu in the
# name after the normal toolchain.
#
# For example, `gn gen --args="custom_toolchain=...:clang_x64_v8_arm64"`
# is equivalent to setting --args=`v8_target_cpu="arm64"`. Setting
# `custom_toolchain` is more verbose but makes the toolchain that is
# (effectively) being used explicit.
#
# v8_target_cpu can only be used to target one architecture in a build,
# so if you wish to build multiple copies of v8 that are targeting
# different architectures, you will need to do something more
# complicated involving multiple toolchains along the lines of
# custom_toolchain, above.
v8_target_cpu = ""
}
if (v8_target_cpu == "") {
if (current_toolchain == "//build/toolchain/linux:clang_x64_v8_arm64") {
v8_target_cpu = "arm64"
} else if (current_toolchain == "//build/toolchain/linux:clang_x86_v8_arm") {
v8_target_cpu = "arm"
} else if (current_toolchain ==
"//build/toolchain/linux:clang_x86_v8_mips64el") {
v8_target_cpu = "mips64el"
} else if (current_toolchain ==
"//build/toolchain/linux:clang_x86_v8_mipsel") {
v8_target_cpu = "mipsel"
} else if (is_msan) {
# If we're running under a sanitizer, if we configure v8 to generate
# code that will be run under a simulator, then the generated code
# also gets the benefits of the sanitizer.
v8_target_cpu = "arm64"
} else {
v8_target_cpu = target_cpu
}
}
declare_args() {
# This argument is declared here so that it can be overridden in toolchains.
# It should never be explicitly set by the user.
v8_current_cpu = v8_target_cpu
}
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