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// Copyright 2017 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.collect.ImmutableList;
import com.google.devtools.build.lib.analysis.configuredtargets.MergedConfiguredTarget;
import com.google.devtools.build.lib.causes.LabelCause;
import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
import com.google.devtools.build.lib.packages.Aspect;
import com.google.devtools.build.lib.packages.AspectDescriptor;
import com.google.devtools.build.lib.packages.Attribute;
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.skyframe.AspectFunction;
import com.google.devtools.build.lib.skyframe.AspectValue;
import com.google.devtools.build.lib.skyframe.ConfiguredTargetAndData;
import com.google.devtools.build.lib.skyframe.ConfiguredTargetValue;
import com.google.devtools.build.lib.util.OrderedSetMultimap;
import com.google.devtools.build.skyframe.SkyFunction;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.ValueOrException2;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import javax.annotation.Nullable;
/**
* Returns the aspects to attach to rule dependencies.
*/
public final class AspectResolver {
/**
* Given a list of {@link Dependency} objects, returns a multimap from the {@link Dependency}s to
* the {@link ConfiguredAspect} instances that should be merged with them.
*
* <p>Returns null if the required aspects are not yet available from Skyframe.
*/
@Nullable
public static OrderedSetMultimap<Dependency, ConfiguredAspect> resolveAspectDependencies(
SkyFunction.Environment env,
Map<SkyKey, ConfiguredTargetAndData> configuredTargetMap,
Iterable<Dependency> deps,
@Nullable NestedSetBuilder<Package> transitivePackages)
throws AspectFunction.AspectCreationException, InterruptedException {
OrderedSetMultimap<Dependency, ConfiguredAspect> result = OrderedSetMultimap.create();
Set<SkyKey> allAspectKeys = new HashSet<>();
for (Dependency dep : deps) {
allAspectKeys.addAll(getAspectKeys(dep).values());
}
Map<SkyKey, ValueOrException2<AspectFunction.AspectCreationException, NoSuchThingException>>
depAspects = env.getValuesOrThrow(allAspectKeys,
AspectFunction.AspectCreationException.class, NoSuchThingException.class);
for (Dependency dep : deps) {
Map<AspectDescriptor, SkyKey> aspectToKeys = getAspectKeys(dep);
for (AspectCollection.AspectDeps depAspect : dep.getAspects().getVisibleAspects()) {
SkyKey aspectKey = aspectToKeys.get(depAspect.getAspect());
AspectValue aspectValue;
try {
// TODO(ulfjack): Catch all thrown AspectCreationException and NoSuchThingException
// instances and merge them into a single Exception to get full root cause data.
aspectValue = (AspectValue) depAspects.get(aspectKey).get();
} catch (NoSuchThingException e) {
throw new AspectFunction.AspectCreationException(
String.format(
"Evaluation of aspect %s on %s failed: %s",
depAspect.getAspect().getAspectClass().getName(),
dep.getLabel(),
e.toString()),
new LabelCause(dep.getLabel(), e.getMessage()));
}
if (aspectValue == null) {
// Dependent aspect has either not been computed yet or is in error.
return null;
}
// Validate that aspect is applicable to "bare" configured target.
ConfiguredTargetAndData associatedTarget =
configuredTargetMap.get(
ConfiguredTargetValue.key(dep.getLabel(), dep.getConfiguration()));
if (!aspectMatchesConfiguredTarget(associatedTarget, aspectValue.getAspect())) {
continue;
}
result.put(dep, aspectValue.getConfiguredAspect());
if (transitivePackages != null) {
transitivePackages.addTransitive(
aspectValue.getTransitivePackagesForPackageRootResolution());
}
}
}
return result;
}
/**
* Merges each direct dependency configured target with the aspects associated with it.
*
* <p>Note that the combination of a configured target and its associated aspects are not
* represented by a Skyframe node. This is because there can possibly be many different
* combinations of aspects for a particular configured target, so it would result in a
* combinatorial explosion of Skyframe nodes.
*/
public static OrderedSetMultimap<Attribute, ConfiguredTargetAndData> mergeAspects(
OrderedSetMultimap<Attribute, Dependency> depValueNames,
Map<SkyKey, ConfiguredTargetAndData> depConfiguredTargetMap,
OrderedSetMultimap<Dependency, ConfiguredAspect> depAspectMap)
throws MergedConfiguredTarget.DuplicateException {
OrderedSetMultimap<Attribute, ConfiguredTargetAndData> result = OrderedSetMultimap.create();
for (Map.Entry<Attribute, Dependency> entry : depValueNames.entries()) {
Dependency dep = entry.getValue();
SkyKey depKey = ConfiguredTargetValue.key(dep.getLabel(), dep.getConfiguration());
ConfiguredTargetAndData depConfiguredTarget = depConfiguredTargetMap.get(depKey);
result.put(
entry.getKey(),
depConfiguredTarget.fromConfiguredTarget(
MergedConfiguredTarget.of(
depConfiguredTarget.getConfiguredTarget(), depAspectMap.get(dep))));
}
return result;
}
private static Map<AspectDescriptor, SkyKey> getAspectKeys(Dependency dep) {
HashMap<AspectDescriptor, SkyKey> result = new HashMap<>();
AspectCollection aspects = dep.getAspects();
for (AspectCollection.AspectDeps aspectDeps : aspects.getVisibleAspects()) {
buildAspectKey(aspectDeps, result, dep);
}
return result;
}
private static AspectValue.AspectKey buildAspectKey(AspectCollection.AspectDeps aspectDeps,
HashMap<AspectDescriptor, SkyKey> result, Dependency dep) {
if (result.containsKey(aspectDeps.getAspect())) {
return (AspectValue.AspectKey) result.get(aspectDeps.getAspect()).argument();
}
ImmutableList.Builder<AspectValue.AspectKey> dependentAspects = ImmutableList.builder();
for (AspectCollection.AspectDeps path : aspectDeps.getDependentAspects()) {
dependentAspects.add(buildAspectKey(path, result, dep));
}
AspectValue.AspectKey aspectKey = AspectValue.createAspectKey(
dep.getLabel(), dep.getConfiguration(),
dependentAspects.build(),
aspectDeps.getAspect(),
dep.getAspectConfiguration(aspectDeps.getAspect()));
result.put(aspectKey.getAspectDescriptor(), aspectKey);
return aspectKey;
}
public static boolean aspectMatchesConfiguredTarget(ConfiguredTargetAndData dep, Aspect aspect) {
if (!aspect.getDefinition().applyToFiles() && !(dep.getTarget() instanceof Rule)) {
return false;
}
if (dep.getTarget().getAssociatedRule() == null) {
// even aspects that 'apply to files' cannot apply to input files.
return false;
}
return dep.getConfiguredTarget().satisfies(aspect.getDefinition().getRequiredProviders());
}
}
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