# 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 (current_toolchain == "//build/toolchain/linux:clang_x64_v8_riscv64") { v8_target_cpu = "riscv64" } 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 }