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# Copyright 2021 the V8 project authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Build rules to choose the v8 target architecture."""
load("@bazel_skylib//lib:selects.bzl", "selects")
V8CpuTypeInfo = provider(
doc = "A singleton provider that specifies the V8 target CPU type",
fields = {
"value": "The V8 Target CPU selected.",
},
)
def _host_target_cpu_impl(ctx):
allowed_values = ["arm", "arm64", "ia32", "ppc64le", "riscv64", "s390x", "x64", "none"]
cpu_type = ctx.build_setting_value
if cpu_type in allowed_values:
return V8CpuTypeInfo(value = cpu_type)
else:
fail("Error setting " + str(ctx.label) + ": invalid v8 target cpu '" +
cpu_type + "'. Allowed values are " + str(allowed_values))
v8_target_cpu = rule(
implementation = _host_target_cpu_impl,
build_setting = config.string(flag = True),
doc = "CPU that V8 will generate code for.",
)
def v8_configure_target_cpu(name, matching_configs):
selects.config_setting_group(
name = "is_" + name,
match_any = matching_configs,
)
# If v8_target_cpu flag is set to 'name'
native.config_setting(
name = "v8_host_target_is_" + name,
flag_values = {
":v8_target_cpu": name,
},
)
# Default target if no v8_host_target flag is set.
selects.config_setting_group(
name = "v8_target_is_" + name,
match_all = [
":v8_host_target_is_none",
":is_" + name,
],
)
# Select either the default target or the flag.
selects.config_setting_group(
name = "v8_target_" + name,
match_any = [
":v8_host_target_is_" + name,
":v8_target_is_" + name,
],
)
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