| // 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.query2.query.aspectresolvers; |
| |
| import com.google.common.collect.ImmutableMultimap; |
| import com.google.common.collect.LinkedListMultimap; |
| import com.google.common.collect.Multimap; |
| import com.google.devtools.build.lib.cmdline.Label; |
| import com.google.devtools.build.lib.cmdline.LabelSyntaxException; |
| import com.google.devtools.build.lib.cmdline.PackageIdentifier; |
| import com.google.devtools.build.lib.events.ExtendedEventHandler; |
| import com.google.devtools.build.lib.packages.Aspect; |
| import com.google.devtools.build.lib.packages.AspectDefinition; |
| import com.google.devtools.build.lib.packages.Attribute; |
| import com.google.devtools.build.lib.packages.DependencyFilter; |
| 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.Rule; |
| import com.google.devtools.build.lib.packages.Target; |
| import com.google.devtools.build.lib.pkgcache.PackageProvider; |
| import java.util.LinkedHashSet; |
| import java.util.Set; |
| |
| /** |
| * An aspect resolver that returns only those aspects that are possibly active given the rule |
| * classes of direct dependencies. |
| * |
| * <p>Needs to load the packages that contain dependencies through attributes with aspects. |
| */ |
| public class PreciseAspectResolver implements AspectResolver { |
| private final PackageProvider packageProvider; |
| private final ExtendedEventHandler eventHandler; |
| |
| public PreciseAspectResolver(PackageProvider packageProvider, ExtendedEventHandler eventHandler) { |
| this.packageProvider = packageProvider; |
| this.eventHandler = eventHandler; |
| } |
| |
| @Override |
| public ImmutableMultimap<Attribute, Label> computeAspectDependencies( |
| Target target, DependencyFilter dependencyFilter) throws InterruptedException { |
| if (!(target instanceof Rule)) { |
| return ImmutableMultimap.of(); |
| } |
| Rule rule = (Rule) target; |
| if (!rule.hasAspects()) { |
| return ImmutableMultimap.of(); |
| } |
| Multimap<Attribute, Label> result = LinkedListMultimap.create(); |
| Multimap<Attribute, Label> transitions = |
| rule.getTransitions(DependencyFilter.NO_NODEP_ATTRIBUTES); |
| for (Attribute attribute : transitions.keySet()) { |
| for (Aspect aspect : attribute.getAspects(rule)) { |
| if (hasDepThatSatisfies(aspect, transitions.get(attribute))) { |
| AspectDefinition.forEachLabelDepFromAllAttributesOfAspect( |
| rule, aspect, dependencyFilter, result::put); |
| } |
| } |
| } |
| return ImmutableMultimap.copyOf(result); |
| } |
| |
| private boolean hasDepThatSatisfies(Aspect aspect, Iterable<Label> labelDeps) |
| throws InterruptedException { |
| for (Label toLabel : labelDeps) { |
| Target toTarget; |
| try { |
| toTarget = packageProvider.getTarget(eventHandler, toLabel); |
| } catch (NoSuchThingException e) { |
| // Do nothing interesting. 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. |
| continue; |
| } |
| if (!(toTarget instanceof Rule)) { |
| continue; |
| } |
| if (AspectDefinition.satisfies( |
| aspect, ((Rule) toTarget).getRuleClassObject().getAdvertisedProviders())) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public Set<Label> computeBuildFileDependencies(Package pkg) throws InterruptedException { |
| Set<Label> result = new LinkedHashSet<>(); |
| result.addAll(pkg.getSkylarkFileDependencies()); |
| |
| 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().values()) { |
| |
| if (!(target instanceof Rule)) { |
| continue; |
| } |
| |
| // ...figure out which direct dependencies can possibly have aspects attached to them... |
| Multimap<Attribute, Label> depsWithPossibleAspects = |
| ((Rule) target) |
| .getTransitions( |
| (Rule rule, Attribute attribute) -> { |
| for (Aspect aspectWithParameters : attribute.getAspects(rule)) { |
| if (!aspectWithParameters.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 labels of all the bzl files loaded by the packages found. |
| for (PackageIdentifier packageIdentifier : dependentPackages) { |
| try { |
| result.add(Label.create(packageIdentifier, "BUILD")); |
| Package dependentPackage = packageProvider.getPackage(eventHandler, packageIdentifier); |
| result.addAll(dependentPackage.getSkylarkFileDependencies()); |
| } 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 (LabelSyntaxException e) { |
| throw new IllegalStateException(e); |
| } |
| } |
| |
| return result; |
| } |
| } |