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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.skyframe;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.LinkedHashMultimap;
import com.google.common.collect.Multimap;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
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.NoSuchTargetException;
import com.google.devtools.build.lib.packages.Rule;
import com.google.devtools.build.lib.packages.Target;
import com.google.devtools.build.lib.skyframe.TransitiveTraversalFunction.DummyAccumulator;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import com.google.devtools.build.skyframe.ValueOrException2;
import java.util.Map.Entry;
/**
* This class is like {@link TransitiveTargetFunction}, but the values it returns do not contain
* {@link NestedSet}s. It should be used only when the side-effects of {@link
* TransitiveTargetFunction} are desired (i.e., loading transitive targets and their packages, and
* emitting error events).
*/
public class TransitiveTraversalFunction extends TransitiveBaseTraversalFunction<DummyAccumulator> {
@Override
SkyKey getKey(Label label) {
return TransitiveTraversalValue.key(label);
}
@Override
DummyAccumulator processTarget(Label label, TargetAndErrorIfAny targetAndErrorIfAny) {
return DummyAccumulator.INSTANCE;
}
@Override
void processDeps(DummyAccumulator processedTargets, EventHandler eventHandler,
TargetAndErrorIfAny targetAndErrorIfAny,
Iterable<Entry<SkyKey, ValueOrException2<NoSuchPackageException, NoSuchTargetException>>>
depEntries) {
Target target = targetAndErrorIfAny.getTarget();
for (Entry<SkyKey, ValueOrException2<NoSuchPackageException, NoSuchTargetException>> entry :
depEntries) {
Label depLabel = (Label) entry.getKey().argument();
TransitiveTraversalValue transitiveTraversalValue;
try {
transitiveTraversalValue = (TransitiveTraversalValue) entry.getValue().get();
if (transitiveTraversalValue == null) {
continue;
}
} catch (NoSuchPackageException | NoSuchTargetException e) {
maybeReportErrorAboutMissingEdge(target, depLabel, e, eventHandler);
continue;
}
if (transitiveTraversalValue.getErrorLoadingTarget() != null) {
maybeReportErrorAboutMissingEdge(target, depLabel,
transitiveTraversalValue.getErrorLoadingTarget(), eventHandler);
}
}
}
@Override
SkyValue computeSkyValue(TargetAndErrorIfAny targetAndErrorIfAny,
DummyAccumulator processedTargets) {
NoSuchTargetException errorLoadingTarget = targetAndErrorIfAny.getErrorLoadingTarget();
return errorLoadingTarget == null
? TransitiveTraversalValue.SUCCESSFUL_TRANSITIVE_TRAVERSAL_VALUE
: TransitiveTraversalValue.unsuccessfulTransitiveTraversal(errorLoadingTarget);
}
@Override
protected Iterable<SkyKey> getStrictLabelAspectKeys(Target target, Environment env) {
return ImmutableSet.of();
}
@Override
protected Iterable<SkyKey> getConservativeLabelAspectKeys(Target target) {
if (!(target instanceof Rule)) {
return ImmutableSet.of();
}
Rule rule = (Rule) target;
Multimap<Attribute, Label> attibuteMap = LinkedHashMultimap.create();
for (Attribute attribute : rule.getTransitions(Rule.NO_NODEP_ATTRIBUTES).keys()) {
for (Class<? extends AspectFactory<?, ?, ?>> aspectFactory : attribute.getAspects()) {
AspectDefinition.addAllAttributesOfAspect(rule, attibuteMap,
AspectFactory.Util.create(aspectFactory).getDefinition(), Rule.ALL_DEPS);
}
}
ImmutableSet.Builder<SkyKey> depKeys = new ImmutableSet.Builder<>();
for (Label label : attibuteMap.values()) {
depKeys.add(getKey(label));
}
return depKeys.build();
}
/**
* Because {@link TransitiveTraversalFunction} is invoked only when its side-effects are desired,
* this value accumulator has nothing to keep track of.
*/
static class DummyAccumulator {
static final DummyAccumulator INSTANCE = new DummyAccumulator();
private DummyAccumulator() {}
}
}
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