1# Copyright 2021 the V8 project authors. All rights reserved. 2# Use of this source code is governed by a BSD-style license that can be 3# found in the LICENSE file. 4 5"""Build rules to choose the v8 target architecture.""" 6 7load("@bazel_skylib//lib:selects.bzl", "selects") 8 9V8CpuTypeInfo = provider( 10 doc = "A singleton provider that specifies the V8 target CPU type", 11 fields = { 12 "value": "The V8 Target CPU selected.", 13 }, 14) 15 16def _host_target_cpu_impl(ctx): 17 allowed_values = ["arm", "arm64", "ia32", "ppc64le", "riscv64", "s390x", "x64", "none"] 18 cpu_type = ctx.build_setting_value 19 if cpu_type in allowed_values: 20 return V8CpuTypeInfo(value = cpu_type) 21 else: 22 fail("Error setting " + str(ctx.label) + ": invalid v8 target cpu '" + 23 cpu_type + "'. Allowed values are " + str(allowed_values)) 24 25v8_target_cpu = rule( 26 implementation = _host_target_cpu_impl, 27 build_setting = config.string(flag = True), 28 doc = "CPU that V8 will generate code for.", 29) 30 31def v8_configure_target_cpu(name, matching_configs): 32 selects.config_setting_group( 33 name = "is_" + name, 34 match_any = matching_configs, 35 ) 36 37 # If v8_target_cpu flag is set to 'name' 38 native.config_setting( 39 name = "v8_host_target_is_" + name, 40 flag_values = { 41 ":v8_target_cpu": name, 42 }, 43 ) 44 45 # Default target if no v8_host_target flag is set. 46 selects.config_setting_group( 47 name = "v8_target_is_" + name, 48 match_all = [ 49 ":v8_host_target_is_none", 50 ":is_" + name, 51 ], 52 ) 53 54 # Select either the default target or the flag. 55 selects.config_setting_group( 56 name = "v8_target_" + name, 57 match_any = [ 58 ":v8_host_target_is_" + name, 59 ":v8_target_is_" + name, 60 ], 61 ) 62