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# Copyright 2024 The Bazel Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Conversion helper functions to legacy cc_toolchain_config_info."""
load(
"//cc:cc_toolchain_config_lib.bzl",
legacy_action_config = "action_config",
legacy_env_entry = "env_entry",
legacy_env_set = "env_set",
legacy_feature = "feature",
legacy_feature_set = "feature_set",
legacy_flag_set = "flag_set",
legacy_tool = "tool",
legacy_with_feature_set = "with_feature_set",
)
load(
"//cc/toolchains:cc_toolchain_info.bzl",
"ArgsListInfo",
"FeatureInfo",
)
visibility([
"//cc/toolchains/...",
"//tests/rule_based_toolchain/...",
])
# Note that throughout this file, we sort anything for which the order is
# nondeterministic (eg. depset's .to_list(), dictionary iteration).
# This allows our tests to call equals() on the output,
# and *may* provide better caching properties.
def _convert_actions(actions):
return sorted([action.name for action in actions.to_list()])
def convert_feature_constraint(constraint):
return legacy_with_feature_set(
features = sorted([ft.name for ft in constraint.all_of.to_list()]),
not_features = sorted([ft.name for ft in constraint.none_of.to_list()]),
)
def convert_args(args):
"""Converts an ArgsInfo to flag_sets and env_sets.
Args:
args: (ArgsInfo) The args to convert
Returns:
struct(flag_sets = List[flag_set], env_sets = List[env_sets])
"""
actions = _convert_actions(args.actions)
with_features = [
convert_feature_constraint(fc)
for fc in args.requires_any_of
]
flag_sets = []
if args.nested != None:
flag_sets.append(legacy_flag_set(
actions = actions,
with_features = with_features,
flag_groups = [args.nested.legacy_flag_group],
))
env_sets = []
if args.env:
env_sets.append(legacy_env_set(
actions = actions,
with_features = with_features,
env_entries = [
legacy_env_entry(
key = key,
value = value,
)
for key, value in args.env.items()
],
))
return struct(
flag_sets = flag_sets,
env_sets = env_sets,
)
def _convert_args_sequence(args_sequence):
flag_sets = []
env_sets = []
for args in args_sequence:
legacy_args = convert_args(args)
flag_sets.extend(legacy_args.flag_sets)
env_sets.extend(legacy_args.env_sets)
return struct(flag_sets = flag_sets, env_sets = env_sets)
def convert_feature(feature):
if feature.external:
return None
args = _convert_args_sequence(feature.args.args)
return legacy_feature(
name = feature.name,
enabled = feature.enabled,
flag_sets = args.flag_sets,
env_sets = args.env_sets,
implies = sorted([ft.name for ft in feature.implies.to_list()]),
requires = [
legacy_feature_set(sorted([
feature.name
for feature in requirement.features.to_list()
]))
for requirement in feature.requires_any_of
],
provides = [
mutex.name
for mutex in feature.mutually_exclusive
],
)
def convert_tool(tool):
return legacy_tool(
tool = tool.exe,
execution_requirements = list(tool.execution_requirements),
with_features = [
convert_feature_constraint(fc)
for fc in tool.requires_any_of
],
)
def _convert_action_type_config(atc):
implies = sorted([ft.name for ft in atc.implies.to_list()])
if atc.args:
implies.append("implied_by_%s" % atc.action_type.name)
return legacy_action_config(
action_name = atc.action_type.name,
enabled = True,
tools = [convert_tool(tool) for tool in atc.tools],
implies = implies,
)
def convert_toolchain(toolchain):
"""Converts a rule-based toolchain into the legacy providers.
Args:
toolchain: CcToolchainConfigInfo: The toolchain config to convert.
Returns:
A struct containing parameters suitable to pass to
cc_common.create_cc_toolchain_config_info.
"""
features = [convert_feature(feature) for feature in toolchain.features]
features.append(convert_feature(FeatureInfo(
# We reserve names starting with implied_by. This ensures we don't
# conflict with the name of a feature the user creates.
name = "implied_by_always_enabled",
enabled = True,
args = ArgsListInfo(args = toolchain.args),
implies = depset([]),
requires_any_of = [],
mutually_exclusive = [],
external = False,
)))
action_configs = []
for atc in toolchain.action_type_configs.values():
# Action configs don't take in an env like they do a flag set.
# In order to support them, we create a feature with the env that the action
# config will enable, and imply it in the action config.
if atc.args:
features.append(convert_feature(FeatureInfo(
name = "implied_by_%s" % atc.action_type.name,
enabled = False,
args = ArgsListInfo(args = atc.args),
implies = depset([]),
requires_any_of = [],
mutually_exclusive = [],
external = False,
)))
action_configs.append(_convert_action_type_config(atc))
return struct(
features = sorted([ft for ft in features if ft != None], key = lambda ft: ft.name),
action_configs = sorted(action_configs, key = lambda ac: ac.action_name),
)
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