| // Copyright 2014 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; |
| |
| import com.google.devtools.build.lib.actions.Artifact; |
| import com.google.devtools.build.lib.analysis.config.BuildConfiguration; |
| import com.google.devtools.build.lib.analysis.configuredtargets.InputFileConfiguredTarget; |
| import com.google.devtools.build.lib.analysis.configuredtargets.PackageGroupConfiguredTarget; |
| import com.google.devtools.build.lib.cmdline.Label; |
| import com.google.devtools.build.lib.collect.nestedset.NestedSet; |
| import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder; |
| import com.google.devtools.build.lib.collect.nestedset.Order; |
| import com.google.devtools.build.lib.packages.RequiredProviders; |
| import com.google.devtools.build.lib.skyframe.BuildConfigurationValue; |
| import com.google.devtools.build.lib.skylarkinterface.Param; |
| import com.google.devtools.build.lib.skylarkinterface.SkylarkCallable; |
| import com.google.devtools.build.lib.skylarkinterface.SkylarkModule; |
| import com.google.devtools.build.lib.skylarkinterface.SkylarkModuleCategory; |
| import com.google.devtools.build.lib.syntax.SkylarkIndexable; |
| import com.google.devtools.build.lib.syntax.SkylarkNestedSet; |
| import javax.annotation.Nullable; |
| |
| /** |
| * Multiple {@link TransitiveInfoProvider}s bundled together. |
| * |
| * <p>Represents the information made available by a {@link ConfiguredTarget} to other ones that |
| * depend on it. For more information about the analysis phase, see {@link |
| * com.google.devtools.build.lib.analysis.RuleConfiguredTargetFactory}. |
| * |
| * <p>Implementations of build rules should <b>not</b> hold on to references to the {@link |
| * TransitiveInfoCollection}s representing their direct prerequisites in order to reduce their |
| * memory footprint (otherwise, the referenced object could refer one of its direct dependencies in |
| * turn, thereby making the size of the objects reachable from a single instance unbounded). |
| * |
| * @see com.google.devtools.build.lib.analysis.RuleConfiguredTargetFactory |
| * @see TransitiveInfoProvider |
| */ |
| @SkylarkModule( |
| name = "Target", |
| category = SkylarkModuleCategory.BUILTIN, |
| doc = |
| "A BUILD target. It is essentially a <code>struct</code> with the following fields:" |
| + "<ul>" |
| + "<li><h3 id=\"modules.Target.label\">label</h3><code><a class=\"anchor\" " |
| + "href=\"Label.html\">Label</a> Target.label</code><br>The identifier of the " |
| + "target.</li>" |
| + "<li><h3 id=\"modules.Target.files\">files</h3><code><a class=\"anchor\" " |
| + "href=\"depset.html\">depset</a> Target.files </code><br>The set of " |
| + "<a class=\"anchor\" href=\"File.html\">File</a>s produced directly by this " |
| + "target.</li>" |
| + "<li><h3 id=\"modules.Target.aspect_ids\">aspect_ids</h3><code><a class=\"anchor\"" |
| + "href=\"list.html\">list</a> Target.aspect_ids </code><br>The list of " |
| + "<a class=\"anchor\" href=\"ctx.html#aspect_id\">aspect_id</a>s applied to this " |
| + "target.</li>" |
| + "<li><h3 id=\"modules.Target.extraproviders\">Extra providers</h3>For rule targets all " |
| + "additional providers provided by this target are accessible as <code>struct</code> " |
| + "fields. These extra providers are defined in the <code>struct</code> returned by the " |
| + "rule implementation function.</li>" |
| + "</ul>" |
| ) |
| public interface TransitiveInfoCollection extends SkylarkIndexable, SkylarkProviderCollection { |
| |
| @SkylarkCallable(name = "output_group", |
| documented = false, // TODO(dslomov): document. |
| parameters = { |
| @Param(name = "group_name", type = String.class, doc = "Output group name", named = true) |
| } |
| ) |
| default SkylarkNestedSet outputGroup(String group) { |
| OutputGroupInfo provider = OutputGroupInfo.get(this); |
| NestedSet<Artifact> result = provider != null |
| ? provider.getOutputGroup(group) |
| : NestedSetBuilder.<Artifact>emptySet(Order.STABLE_ORDER); |
| return SkylarkNestedSet.of(Artifact.class, result); |
| } |
| |
| /** |
| * Returns the transitive information provider requested, or null if the provider is not found. |
| * The provider has to be a TransitiveInfoProvider Java class. |
| */ |
| @Nullable <P extends TransitiveInfoProvider> P getProvider(Class<P> provider); |
| |
| /** |
| * Returns the label associated with this prerequisite. |
| */ |
| Label getLabel(); |
| |
| /** |
| * Returns the {@link BuildConfigurationValue.Key} naming the {@link BuildConfiguration} for which |
| * this transitive info collection is defined. Configuration is defined for all configured targets |
| * with exception of {@link InputFileConfiguredTarget} and {@link PackageGroupConfiguredTarget} |
| * for which it is always <b>null</b>. |
| */ |
| @Nullable |
| BuildConfigurationValue.Key getConfigurationKey(); |
| |
| /** |
| * Checks whether this {@link TransitiveInfoCollection} satisfies given {@link RequiredProviders}. |
| */ |
| default boolean satisfies(RequiredProviders providers) { |
| return providers.isSatisfiedBy( |
| aClass -> getProvider(aClass.asSubclass(TransitiveInfoProvider.class)) != null, |
| id -> this.get(id) != null); |
| } |
| |
| /** |
| * Returns providers that this {@link TransitiveInfoCollection} misses from a given {@link |
| * RequiredProviders}. |
| * |
| * <p>If none are missing, returns {@link RequiredProviders} that accept any set of providers. |
| */ |
| default RequiredProviders missingProviders(RequiredProviders providers) { |
| return providers.getMissing( |
| aClass -> getProvider(aClass.asSubclass(TransitiveInfoProvider.class)) != null, |
| id -> this.get(id) != null); |
| } |
| } |