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// 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.skyframe;
import static com.google.devtools.build.lib.skyframe.SkyFunctions.TRANSITIVE_TARGET;
import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.base.Predicates;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.events.ExtendedEventHandler;
import com.google.devtools.build.lib.pkgcache.PackageProvider;
import com.google.devtools.build.lib.skyframe.AspectValue.AspectKey;
import com.google.devtools.build.skyframe.CycleInfo;
import com.google.devtools.build.skyframe.SkyKey;
/**
* Reports cycles between {@link ConfiguredTargetValue}s. Similar to
* {@link TransitiveTargetCycleReporter}, these indicate cycles between targets, but during the
* analysis phase. In the current target-parsing, loading, analysis, and execution phase
* distinction, such cycles can only occur due to the presence of a specific configuration (if
* such a cycle occurs regardless of the configuration, then it would have been caught during the
* target parsing or loading phase).
*/
class ConfiguredTargetCycleReporter extends AbstractLabelCycleReporter {
private static final Predicate<SkyKey> IS_CONFIGURED_TARGET_SKY_KEY =
Predicates.or(
SkyFunctions.isSkyFunction(SkyFunctions.CONFIGURED_TARGET),
SkyFunctions.isSkyFunction(SkyFunctions.ASPECT));
private static final Predicate<SkyKey> IS_TRANSITIVE_TARGET_SKY_KEY =
SkyFunctions.isSkyFunction(TRANSITIVE_TARGET);
private final TransitiveTargetCycleReporter targetReporter;
ConfiguredTargetCycleReporter(PackageProvider packageProvider) {
super(packageProvider);
targetReporter = new TransitiveTargetCycleReporter(packageProvider);
}
@Override
protected boolean canReportCycle(SkyKey topLevelKey, CycleInfo cycleInfo) {
if (!IS_CONFIGURED_TARGET_SKY_KEY.apply(topLevelKey)) {
return false;
}
Iterable<SkyKey> cycleKeys = Iterables.concat(cycleInfo.getPathToCycle(), cycleInfo.getCycle());
// The top-level key should be a ConfiguredTargetValue key, but cycles and paths to it can
// travel through TransitiveTargetValue keys because ConfiguredTargetFunction visits
// visits TransitiveTargetFunction as a part of dynamic configuration computation.
return Iterables.all(cycleKeys,
Predicates.<SkyKey>or(IS_CONFIGURED_TARGET_SKY_KEY, IS_TRANSITIVE_TARGET_SKY_KEY));
}
@Override
protected String getAdditionalMessageAboutCycle(
ExtendedEventHandler eventHandler, SkyKey topLevelKey, CycleInfo cycleInfo) {
if (Iterables.all(cycleInfo.getCycle(), IS_TRANSITIVE_TARGET_SKY_KEY)) {
// The problem happened strictly in loading, so delegate the explanation to
// TransitiveTargetCycleReporter.
Iterable<SkyKey> pathAsTargetKeys = Iterables.transform(cycleInfo.getPathToCycle(),
new Function<SkyKey, SkyKey>() {
@Override
public SkyKey apply(SkyKey key) {
return asTransitiveTargetKey(key);
}
});
return targetReporter.getAdditionalMessageAboutCycle(eventHandler,
asTransitiveTargetKey(topLevelKey),
new CycleInfo(pathAsTargetKeys, cycleInfo.getCycle()));
} else {
return "\nThis cycle occurred because of a configuration option";
}
}
private SkyKey asTransitiveTargetKey(SkyKey key) {
return IS_TRANSITIVE_TARGET_SKY_KEY.apply(key)
? key
: TransitiveTargetKey.of(((ConfiguredTargetKey) key.argument()).getLabel());
}
@Override
public String prettyPrint(SkyKey key) {
if (SkyFunctions.isSkyFunction(SkyFunctions.CONFIGURED_TARGET).apply(key)) {
return ((ConfiguredTargetKey) key.argument()).prettyPrint();
} else if (SkyFunctions.isSkyFunction(SkyFunctions.ASPECT).apply(key)) {
return ((AspectKey) key.argument()).prettyPrint();
} else {
return getLabel(key).toString();
}
}
@Override
public Label getLabel(SkyKey key) {
if (SkyFunctions.isSkyFunction(SkyFunctions.CONFIGURED_TARGET).apply(key)) {
return ((ConfiguredTargetKey) key.argument()).getLabel();
} else if (SkyFunctions.isSkyFunction(SkyFunctions.ASPECT).apply(key)) {
return ((AspectKey) key.argument()).getLabel();
} else if (SkyFunctions.isSkyFunction(TRANSITIVE_TARGET).apply(key)) {
return ((TransitiveTargetKey) key).getLabel();
} else {
throw new UnsupportedOperationException();
}
}
}
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