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// 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.common.base.Preconditions;
import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.analysis.RuleConfiguredTarget.Mode;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
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.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.packages.BuildType;
import com.google.devtools.build.lib.packages.TriState;
import com.google.devtools.build.lib.vfs.PathFragment;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collection;
/**
* Utility functions for use during analysis.
*/
public final class AnalysisUtils {
private AnalysisUtils() {
throw new IllegalStateException(); // utility class
}
/**
* Returns whether link stamping is enabled for a rule.
*
* <p>This returns false for unstampable rule classes and for rules in the
* host configuration. Otherwise it returns the value of the stamp attribute,
* or of the stamp option if the attribute value is -1.
*/
public static boolean isStampingEnabled(RuleContext ruleContext) {
BuildConfiguration config = ruleContext.getConfiguration();
if (config.isHostConfiguration()
|| !ruleContext.attributes().has("stamp", BuildType.TRISTATE)) {
return false;
}
TriState stamp = ruleContext.attributes().get("stamp", BuildType.TRISTATE);
return stamp == TriState.YES || (stamp == TriState.AUTO && config.stampBinaries());
}
// TODO(bazel-team): These need Iterable<? extends TransitiveInfoCollection> because they need to
// be called with Iterable<ConfiguredTarget>. Once the configured target lockdown is complete, we
// can eliminate the "extends" clauses.
/**
* Returns the list of providers of the specified type from a set of transitive info
* collections.
*/
public static <C extends TransitiveInfoProvider> Iterable<C> getProviders(
Iterable<? extends TransitiveInfoCollection> prerequisites, Class<C> provider) {
Collection<C> result = new ArrayList<>();
for (TransitiveInfoCollection prerequisite : prerequisites) {
C prerequisiteProvider = prerequisite.getProvider(provider);
if (prerequisiteProvider != null) {
result.add(prerequisiteProvider);
}
}
return ImmutableList.copyOf(result);
}
/**
* Returns the iterable of collections that have the specified provider.
*/
public static <S extends TransitiveInfoCollection, C extends TransitiveInfoProvider> Iterable<S>
filterByProvider(Iterable<S> prerequisites, final Class<C> provider) {
return Iterables.filter(prerequisites, new Predicate<S>() {
@Override
public boolean apply(S target) {
return target.getProvider(provider) != null;
}
});
}
/**
* Returns the path of the associated manifest file for the path of a Fileset. Works for both
* exec paths and root relative paths.
*/
public static PathFragment getManifestPathFromFilesetPath(PathFragment filesetDir) {
PathFragment manifestDir = filesetDir.replaceName("_" + filesetDir.getBaseName());
PathFragment outputManifestFrag = manifestDir.getRelative("MANIFEST");
return outputManifestFrag;
}
/**
* Returns the middleman artifact on the specified attribute of the specified rule, or an empty
* set if it does not exist.
*/
public static NestedSet<Artifact> getMiddlemanFor(RuleContext rule, String attribute) {
TransitiveInfoCollection prereq = rule.getPrerequisite(attribute, Mode.HOST);
if (prereq == null) {
return NestedSetBuilder.emptySet(Order.STABLE_ORDER);
}
MiddlemanProvider provider = prereq.getProvider(MiddlemanProvider.class);
if (provider == null) {
return NestedSetBuilder.emptySet(Order.STABLE_ORDER);
}
return provider.getMiddlemanArtifact();
}
/**
* Returns a path fragment qualified by the rule name and unique fragment to
* disambiguate artifacts produced from the source file appearing in
* multiple rules.
*
* <p>For example "//pkg:target" -> "pkg/<fragment>/target.
*/
public static PathFragment getUniqueDirectory(Label label, PathFragment fragment) {
return label.getPackageIdentifier().getPathFragment().getRelative(fragment)
.getRelative(label.getName());
}
/**
* Checks that the given provider class either refers to an interface or to a value class.
*/
public static <T extends TransitiveInfoProvider> void checkProvider(Class<T> clazz) {
if (!clazz.isInterface()) {
Preconditions.checkArgument(
Modifier.isFinal(clazz.getModifiers()), "%s has to be final", clazz.getName());
Preconditions.checkArgument(clazz.isAnnotationPresent(Immutable.class),
"%s has to be tagged with @Immutable", clazz.getName());
}
}
}
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