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// Copyright 2014 Google Inc. 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.query2.output;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multimaps;
import com.google.devtools.build.lib.events.EventHandler;
import com.google.devtools.build.lib.packages.AspectDefinition;
import com.google.devtools.build.lib.packages.AspectFactory;
import com.google.devtools.build.lib.packages.Attribute;
import com.google.devtools.build.lib.packages.NoSuchPackageException;
import com.google.devtools.build.lib.packages.NoSuchThingException;
import com.google.devtools.build.lib.packages.Package;
import com.google.devtools.build.lib.packages.PackageIdentifier;
import com.google.devtools.build.lib.packages.Rule;
import com.google.devtools.build.lib.packages.Target;
import com.google.devtools.build.lib.pkgcache.PackageProvider;
import com.google.devtools.build.lib.syntax.Label;
import com.google.devtools.build.lib.util.BinaryPredicate;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import javax.annotation.Nullable;
/** Utility class that determines additional dependencies of a target from its aspects. */
public class AspectResolver {
private final PackageProvider packageProvider;
private final EventHandler eventHandler;
public AspectResolver(PackageProvider packageProvider, EventHandler eventHandler) {
this.packageProvider = packageProvider;
this.eventHandler = eventHandler;
}
/**
* Compute additional dependencies of target from aspects. This method is going to load direct
* deps of target to determine their types. Returns map of attributes and corresponding label
* values.
*/
Map<Attribute, Collection<Label>> computeAspectDependenciesWithAttributes(Target target)
throws InterruptedException {
Map<Attribute, Collection<Label>> aspectDependencies = new LinkedHashMap<>();
if (target instanceof Rule) {
Multimap<Attribute, Label> transitions =
((Rule) target).getTransitions(Rule.NO_NODEP_ATTRIBUTES);
for (Entry<Attribute, Label> entry : transitions.entries()) {
Target toTarget;
try {
toTarget = packageProvider.getTarget(eventHandler, entry.getValue());
Map<Attribute, Collection<Label>> deps = Multimaps.asMap(
AspectDefinition.visitAspectsIfRequired(target, entry.getKey(), toTarget));
aspectDependencies.putAll(deps);
} catch (NoSuchThingException e) {
// Do nothing. One of target direct deps has an error. The dependency on the BUILD file
// (or one of the files included in it) will be reported in the query result of :BUILD.
}
}
}
return aspectDependencies;
}
/**
* Compute additional dependencies of target from aspects. This method is going to load direct
* deps of target to determine their types. Returns set of labels.
*/
Set<Label> computeAspectDependencies(Target target) throws InterruptedException {
Set<Label> labels = new LinkedHashSet<Label>();
for (Collection<Label> labelCollection :
computeAspectDependenciesWithAttributes(target).values()) {
labels.addAll(labelCollection);
}
return labels;
}
/** The way aspect dependencies for a BUILD file are calculated. */
enum BuildFileDependencyMode {
/** Return all the subincluded files that may affect the package. */
SUBINCLUDE {
@Override
protected Collection<Label> getDependencies(Package pkg) {
return pkg.getSubincludeLabels();
}
},
/** Return all Skylark files that may affect the package. */
SKYLARK {
@Override
protected Collection<Label> getDependencies(Package pkg) {
return pkg.getSkylarkFileDependencies();
}
};
protected abstract Collection<Label> getDependencies(Package pkg);
};
Set<Label> computeBuildFileDependencies(Package pkg, BuildFileDependencyMode mode)
throws InterruptedException {
Set<Label> result = new LinkedHashSet<>();
result.addAll(mode.getDependencies(pkg));
Set<PackageIdentifier> dependentPackages = new LinkedHashSet<>();
// First compute with packages can possibly affect the aspect attributes of this package:
// Iterate over all rules...
for (Target target : pkg.getTargets()) {
if (!(target instanceof Rule)) {
continue;
}
// ...figure out which direct dependencies can possibly have aspects attached to them...
Multimap<Attribute, Label> depsWithPossibleAspects = ((Rule) target).getTransitions(
new BinaryPredicate<Rule, Attribute>() {
@Override
public boolean apply(@Nullable Rule rule, @Nullable Attribute attribute) {
for (Class<? extends AspectFactory<?, ?, ?>> aspectFactory : attribute.getAspects()) {
if (!AspectFactory.Util.create(aspectFactory).getDefinition()
.getAttributes().isEmpty()) {
return true;
}
}
return false;
}
});
// ...and add the package of the aspect.
for (Label depLabel : depsWithPossibleAspects.values()) {
dependentPackages.add(depLabel.getPackageIdentifier());
}
}
// Then add all the subinclude labels of the packages thus found to the result.
for (PackageIdentifier packageIdentifier : dependentPackages) {
try {
result.add(Label.create(packageIdentifier, "BUILD"));
Package dependentPackage = packageProvider.getPackage(eventHandler, packageIdentifier);
result.addAll(mode.getDependencies(dependentPackage));
} catch (NoSuchPackageException e) {
// If the package is not found, just add its BUILD file, which is already done above.
// Hopefully this error is not raised when there is a syntax error in a subincluded file
// or something.
} catch (Label.SyntaxException e) {
throw new IllegalStateException(e);
}
}
return result;
}
}
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