| // Copyright 2015 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. |
| package com.google.devtools.build.lib.analysis.config; |
| |
| import com.google.auto.value.AutoValue; |
| import com.google.devtools.build.lib.analysis.config.transitions.PatchTransition; |
| import com.google.devtools.build.lib.analysis.config.transitions.TransitionFactory; |
| import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec; |
| |
| /** Dynamic transition to the host configuration. */ |
| public final class HostTransition implements PatchTransition { |
| |
| @AutoCodec public static final HostTransition INSTANCE = new HostTransition(); |
| |
| private HostTransition() {} |
| |
| @Override |
| public boolean isHostTransition() { |
| return true; |
| } |
| |
| @Override |
| public BuildOptions patch(BuildOptions options) { |
| if (options.get(CoreOptions.class).isHost) { |
| // If the input already comes from the host configuration, just return the existing values. |
| // |
| // We don't do this just for convenience: if an |
| // {@link com.google.devtools.build.lib.runtime.proto.InvocationPolicyOuterClass.InvocationPolicy} |
| // overrides option defaults, {@link FragmentOptions#getHost} won't honor that policy. That's |
| // because it uses its own options parser that's not aware of the policy. This can create |
| // problems for, e.g., {@link JavaOptions#getHost}, which promotes --host_foo flags to |
| // --foo flags. That works the first time you do it (since both of the original values |
| // were policy-processed). But not subsequent times. |
| // |
| // There are various ways to solve this problem (pass the policy to host options computation, |
| // manually set host.hostFoo = original.hostFoo). But those raise larger questions about the |
| // nature of host/target relationships, so for the time being this is a straightforward |
| // and practical fix. |
| return options.clone(); |
| } else { |
| return options.createHostOptions(); |
| } |
| } |
| |
| /** Returns a {@link TransitionFactory} instance that generates the host transition. */ |
| public static <T> TransitionFactory<T> createFactory() { |
| return new AutoValue_HostTransition_Factory<>(); |
| } |
| |
| /** |
| * Returns {@code true} if the given {@link TransitionFactory} is an instance of the host |
| * transition. |
| */ |
| public static <T> boolean isInstance(TransitionFactory<T> instance) { |
| return instance instanceof Factory; |
| } |
| |
| /** A {@link TransitionFactory} implementation that generates the host transition. */ |
| @AutoValue |
| abstract static class Factory<T> implements TransitionFactory<T> { |
| @Override |
| public PatchTransition create(T unused) { |
| return INSTANCE; |
| } |
| |
| @Override |
| public boolean isHost() { |
| return true; |
| } |
| |
| @Override |
| public boolean isTool() { |
| return true; |
| } |
| } |
| } |