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// Copyright 2014 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 com.google.common.base.Function;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.actions.ActionAnalysisMetadata;
import com.google.devtools.build.lib.analysis.ConfiguredRuleClassProvider;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.Dependency;
import com.google.devtools.build.lib.analysis.DependencyResolver.InconsistentAspectOrderException;
import com.google.devtools.build.lib.analysis.TargetAndConfiguration;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
import com.google.devtools.build.lib.analysis.config.BuildOptions;
import com.google.devtools.build.lib.analysis.config.ConfigMatchingProvider;
import com.google.devtools.build.lib.analysis.config.ConfigurationResolver;
import com.google.devtools.build.lib.analysis.config.InvalidConfigurationException;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.packages.Attribute;
import com.google.devtools.build.lib.packages.BuildType;
import com.google.devtools.build.lib.packages.RawAttributeMapper;
import com.google.devtools.build.lib.packages.Rule;
import com.google.devtools.build.lib.packages.RuleClassProvider;
import com.google.devtools.build.lib.skyframe.SkyframeActionExecutor.ConflictException;
import com.google.devtools.build.lib.syntax.EvalException;
import com.google.devtools.build.lib.util.OrderedSetMultimap;
import com.google.devtools.build.skyframe.SkyFunction;
import com.google.devtools.build.skyframe.SkyFunctionException;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
import javax.annotation.Nullable;
/**
* Build a post-processed ConfiguredTarget, vetting it for action conflict issues.
*/
public class PostConfiguredTargetFunction implements SkyFunction {
private static final Function<Dependency, SkyKey> TO_KEYS =
new Function<Dependency, SkyKey>() {
@Override
public SkyKey apply(Dependency input) {
return PostConfiguredTargetValue.key(
ConfiguredTargetKey.of(input.getLabel(), input.getConfiguration()));
}
};
private final SkyframeExecutor.BuildViewProvider buildViewProvider;
private final RuleClassProvider ruleClassProvider;
private final BuildOptions defaultBuildOptions;
public PostConfiguredTargetFunction(
SkyframeExecutor.BuildViewProvider buildViewProvider,
RuleClassProvider ruleClassProvider,
BuildOptions defaultBuildOptions) {
this.buildViewProvider = Preconditions.checkNotNull(buildViewProvider);
this.ruleClassProvider = ruleClassProvider;
this.defaultBuildOptions = defaultBuildOptions;
}
@Nullable
@Override
public SkyValue compute(SkyKey skyKey, Environment env)
throws SkyFunctionException, InterruptedException {
ImmutableMap<ActionAnalysisMetadata, ConflictException> badActions =
PrecomputedValue.BAD_ACTIONS.get(env);
ConfiguredTargetValue ctValue =
(ConfiguredTargetValue) env.getValue((ConfiguredTargetKey) skyKey.argument());
if (env.valuesMissing()) {
return null;
}
for (ActionAnalysisMetadata action : ctValue.getActions()) {
if (badActions.containsKey(action)) {
throw new ActionConflictFunctionException(badActions.get(action));
}
}
ConfiguredTarget ct = ctValue.getConfiguredTarget();
ConfiguredTargetAndData configuredTargetAndData =
ConfiguredTargetAndData.fromConfiguredTargetInSkyframe(ct, env);
if (configuredTargetAndData == null) {
return null;
}
TargetAndConfiguration ctgValue =
new TargetAndConfiguration(
configuredTargetAndData.getTarget(), configuredTargetAndData.getConfiguration());
ImmutableMap<Label, ConfigMatchingProvider> configConditions =
getConfigurableAttributeConditions(ctgValue, env);
if (configConditions == null) {
return null;
}
OrderedSetMultimap<Attribute, Dependency> deps;
try {
BuildConfiguration hostConfiguration =
buildViewProvider
.getSkyframeBuildView()
.getHostConfiguration(configuredTargetAndData.getConfiguration());
SkyframeDependencyResolver resolver =
buildViewProvider.getSkyframeBuildView().createDependencyResolver(env);
// We don't track root causes here - this function is only invoked for successfully analyzed
// targets - as long as we redo the exact same steps here as in ConfiguredTargetFunction, this
// can never fail.
deps =
resolver.dependentNodeMap(
ctgValue,
hostConfiguration,
/*aspect=*/ null,
configConditions,
/*toolchainLabels=*/ ImmutableSet.of(),
defaultBuildOptions,
((ConfiguredRuleClassProvider) ruleClassProvider).getTrimmingTransitionFactory());
if (configuredTargetAndData.getConfiguration() != null) {
deps =
ConfigurationResolver.resolveConfigurations(
env, ctgValue, deps, hostConfiguration, ruleClassProvider, defaultBuildOptions);
}
} catch (EvalException | ConfiguredTargetFunction.DependencyEvaluationException
| InvalidConfigurationException | InconsistentAspectOrderException e) {
throw new PostConfiguredTargetFunctionException(e);
}
env.getValues(Iterables.transform(deps.values(), TO_KEYS));
if (env.valuesMissing()) {
return null;
}
return new PostConfiguredTargetValue(ct);
}
/**
* Returns the configurable attribute conditions necessary to evaluate the given configured
* target, or null if not all dependencies have yet been SkyFrame-evaluated.
*/
@Nullable
private static ImmutableMap<Label, ConfigMatchingProvider> getConfigurableAttributeConditions(
TargetAndConfiguration ctg, Environment env) throws InterruptedException {
if (!(ctg.getTarget() instanceof Rule)) {
return ImmutableMap.of();
}
Rule rule = (Rule) ctg.getTarget();
RawAttributeMapper mapper = RawAttributeMapper.of(rule);
Set<SkyKey> depKeys = new LinkedHashSet<>();
for (Attribute attribute : rule.getAttributes()) {
for (Label label : mapper.getConfigurabilityKeys(attribute.getName(), attribute.getType())) {
if (!BuildType.Selector.isReservedLabel(label)) {
depKeys.add(ConfiguredTargetValue.key(label, ctg.getConfiguration()));
}
}
}
Map<SkyKey, SkyValue> cts = env.getValues(depKeys);
if (env.valuesMissing()) {
return null;
}
Map<Label, ConfigMatchingProvider> conditions = new LinkedHashMap<>();
for (Map.Entry<SkyKey, SkyValue> entry : cts.entrySet()) {
Label label = ((ConfiguredTargetKey) entry.getKey().argument()).getLabel();
ConfiguredTarget ct = ((ConfiguredTargetValue) entry.getValue()).getConfiguredTarget();
conditions.put(label, Preconditions.checkNotNull(
ct.getProvider(ConfigMatchingProvider.class)));
}
return ImmutableMap.copyOf(conditions);
}
@Nullable
@Override
public String extractTag(SkyKey skyKey) {
return Label.print(((ConfiguredTargetKey) skyKey.argument()).getLabel());
}
private static class ActionConflictFunctionException extends SkyFunctionException {
public ActionConflictFunctionException(ConflictException e) {
super(e, Transience.PERSISTENT);
}
}
private static class PostConfiguredTargetFunctionException extends SkyFunctionException {
public PostConfiguredTargetFunctionException(Exception e) {
super(e, Transience.PERSISTENT);
}
}
}
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