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MergedConfiguredTarget.java
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MergedConfiguredTarget.java
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// Copyright 2016 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.configuredtargets;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.actions.ActionAnalysisMetadata;
import com.google.devtools.build.lib.analysis.AnalysisUtils;
import com.google.devtools.build.lib.analysis.ConfiguredAspect;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.DuplicateException;
import com.google.devtools.build.lib.analysis.ExtraActionArtifactsProvider;
import com.google.devtools.build.lib.analysis.OutputGroupInfo;
import com.google.devtools.build.lib.analysis.RequiredConfigFragmentsProvider;
import com.google.devtools.build.lib.analysis.TransitiveInfoProvider;
import com.google.devtools.build.lib.analysis.TransitiveInfoProviderMap;
import com.google.devtools.build.lib.analysis.TransitiveInfoProviderMapBuilder;
import com.google.devtools.build.lib.analysis.test.AnalysisFailure;
import com.google.devtools.build.lib.analysis.test.AnalysisFailureInfo;
import com.google.devtools.build.lib.analysis.test.InstrumentedFilesInfo;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.packages.Info;
import com.google.devtools.build.lib.packages.Provider;
import com.google.devtools.build.lib.starlarkbuildapi.ActionApi;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.function.Consumer;
import net.starlark.java.eval.Dict;
import net.starlark.java.eval.Printer;
/**
* A single dependency with its configured target and aspects merged together.
*
* <p>This is an ephemeral object created only for the analysis of a single configured target. After
* that configured target is analyzed, this is thrown away.
*/
@Immutable
public final class MergedConfiguredTarget extends AbstractConfiguredTarget {
private final ConfiguredTarget base;
private final ImmutableList<ConfiguredAspect> aspects;
/**
* Providers that come from any source that isn't a pure pointer to the base rule's providers.
*
* <p>Examples include providers from aspects and merged providers that appear in both the base
* rule and aspects.
*/
private final TransitiveInfoProviderMap nonBaseProviders;
private MergedConfiguredTarget(
ConfiguredTarget base,
Iterable<ConfiguredAspect> aspects,
TransitiveInfoProviderMap nonBaseProviders) {
super(base.getLabel(), base.getConfigurationKey());
this.base = base;
this.aspects = ImmutableList.copyOf(aspects);
this.nonBaseProviders = nonBaseProviders;
}
@Override
public <P extends TransitiveInfoProvider> P getProvider(Class<P> providerClass) {
AnalysisUtils.checkProvider(providerClass);
P provider = nonBaseProviders.getProvider(providerClass);
if (provider != null) {
return provider;
}
provider = base.getProvider(providerClass);
if (provider != null) {
return provider;
}
if (providerClass.isAssignableFrom(getClass())) {
return providerClass.cast(this);
}
return null;
}
@Override
protected void addExtraStarlarkKeys(Consumer<String> result) {
if (base instanceof AbstractConfiguredTarget) {
((AbstractConfiguredTarget) base).addExtraStarlarkKeys(result);
}
for (int i = 0; i < nonBaseProviders.getProviderCount(); i++) {
Object classAt = nonBaseProviders.getProviderKeyAt(i);
if (classAt instanceof String) {
result.accept((String) classAt);
}
}
result.accept(AbstractConfiguredTarget.ACTIONS_FIELD_NAME);
}
@Override
protected Info rawGetStarlarkProvider(Provider.Key providerKey) {
Info provider = nonBaseProviders.get(providerKey);
if (provider == null) {
provider = base.get(providerKey);
}
return provider;
}
@Override
protected Object rawGetStarlarkProvider(String providerKey) {
if (providerKey.equals(AbstractConfiguredTarget.ACTIONS_FIELD_NAME)) {
ImmutableList.Builder<ActionAnalysisMetadata> actions = ImmutableList.builder();
// Only expose actions which are StarlarkValues.
// TODO(cparsons): Expose all actions to Starlark.
for (ConfiguredAspect aspect : aspects) {
actions.addAll(
aspect.getActions().stream().filter(action -> action instanceof ActionApi).iterator());
}
if (base instanceof RuleConfiguredTarget) {
actions.addAll(
((RuleConfiguredTarget) base)
.getActions().stream().filter(action -> action instanceof ActionApi).iterator());
}
return actions.build();
}
Object provider = nonBaseProviders.get(providerKey);
if (provider == null) {
provider = base.get(providerKey);
}
return provider;
}
/** Creates an instance based on a configured target and a set of aspects. */
public static ConfiguredTarget of(ConfiguredTarget base, Collection<ConfiguredAspect> aspects)
throws DuplicateException {
if (aspects.isEmpty()) {
return base; // If there are no aspects, don't bother with creating a proxy object.
}
TransitiveInfoProviderMapBuilder nonBaseProviders = new TransitiveInfoProviderMapBuilder();
// Merge output group providers.
OutputGroupInfo mergedOutputGroupInfo =
OutputGroupInfo.merge(getAllOutputGroupProviders(base, aspects));
if (mergedOutputGroupInfo != null) {
nonBaseProviders.put(mergedOutputGroupInfo);
}
// Merge analysis failures.
List<NestedSet<AnalysisFailure>> analysisFailures = getAnalysisFailures(base, aspects);
if (!analysisFailures.isEmpty()) {
nonBaseProviders.put(AnalysisFailureInfo.forAnalysisFailureSets(analysisFailures));
}
// Merge extra-actions provider.
ExtraActionArtifactsProvider mergedExtraActionProviders = ExtraActionArtifactsProvider.merge(
getAllProviders(base, aspects, ExtraActionArtifactsProvider.class));
if (mergedExtraActionProviders != null) {
nonBaseProviders.add(mergedExtraActionProviders);
}
// Merge required config fragments provider.
List<RequiredConfigFragmentsProvider> requiredConfigFragmentProviders =
getAllProviders(base, aspects, RequiredConfigFragmentsProvider.class);
if (!requiredConfigFragmentProviders.isEmpty()) {
nonBaseProviders.add(RequiredConfigFragmentsProvider.merge(requiredConfigFragmentProviders));
}
for (ConfiguredAspect aspect : aspects) {
TransitiveInfoProviderMap providers = aspect.getProviders();
for (int i = 0; i < providers.getProviderCount(); ++i) {
Object providerKey = providers.getProviderKeyAt(i);
if (OutputGroupInfo.STARLARK_CONSTRUCTOR.getKey().equals(providerKey)
|| AnalysisFailureInfo.STARLARK_CONSTRUCTOR.getKey().equals(providerKey)
|| ExtraActionArtifactsProvider.class.equals(providerKey)
|| RequiredConfigFragmentsProvider.class.equals(providerKey)) {
continue;
}
if (providerKey instanceof Class<?>) {
@SuppressWarnings("unchecked")
Class<? extends TransitiveInfoProvider> providerClass =
(Class<? extends TransitiveInfoProvider>) providerKey;
if (base.getProvider(providerClass) != null || nonBaseProviders.contains(providerClass)) {
throw new DuplicateException("Provider " + providerKey + " provided twice");
}
nonBaseProviders.put(
providerClass, (TransitiveInfoProvider) providers.getProviderInstanceAt(i));
} else if (providerKey instanceof String) {
String legacyId = (String) providerKey;
if (base.get(legacyId) != null || nonBaseProviders.contains(legacyId)) {
throw new DuplicateException("Provider " + legacyId + " provided twice");
}
nonBaseProviders.put(legacyId, providers.getProviderInstanceAt(i));
} else if (providerKey instanceof Provider.Key) {
Provider.Key key = (Provider.Key) providerKey;
// If InstrumentedFilesInfo is on both the base target and an aspect, ignore the one from
// the base. Otherwise, sharing implementation between a rule which returns
// InstrumentedFilesInfo (e.g. *_library) and a related aspect (e.g. *_proto_library) can
// add an implicit brittle assumption that the underlying rule (e.g. proto_library) does
// not return InstrumentedFilesInfo.
if ((!InstrumentedFilesInfo.STARLARK_CONSTRUCTOR.getKey().equals(key)
&& base.get(key) != null)
|| nonBaseProviders.contains(key)) {
throw new DuplicateException("Provider " + key + " provided twice");
}
nonBaseProviders.put((Info) providers.getProviderInstanceAt(i));
}
}
}
return new MergedConfiguredTarget(base, aspects, nonBaseProviders.build());
}
private static ImmutableList<OutputGroupInfo> getAllOutputGroupProviders(
ConfiguredTarget base, Iterable<ConfiguredAspect> aspects) {
OutputGroupInfo baseProvider = OutputGroupInfo.get(base);
ImmutableList.Builder<OutputGroupInfo> providers = ImmutableList.builder();
if (baseProvider != null) {
providers.add(baseProvider);
}
for (ConfiguredAspect configuredAspect : aspects) {
OutputGroupInfo aspectProvider = OutputGroupInfo.get(configuredAspect);
if (aspectProvider == null) {
continue;
}
providers.add(aspectProvider);
}
return providers.build();
}
private static ImmutableList<NestedSet<AnalysisFailure>> getAnalysisFailures(
ConfiguredTarget base, Iterable<ConfiguredAspect> aspects) {
ImmutableList.Builder<NestedSet<AnalysisFailure>> analysisFailures = ImmutableList.builder();
AnalysisFailureInfo baseFailureInfo = base.get(AnalysisFailureInfo.STARLARK_CONSTRUCTOR);
if (baseFailureInfo != null) {
analysisFailures.add(baseFailureInfo.getCausesNestedSet());
}
for (ConfiguredAspect configuredAspect : aspects) {
AnalysisFailureInfo aspectFailureInfo =
configuredAspect.get(AnalysisFailureInfo.STARLARK_CONSTRUCTOR);
if (aspectFailureInfo != null) {
analysisFailures.add(aspectFailureInfo.getCausesNestedSet());
}
}
return analysisFailures.build();
}
private static <T extends TransitiveInfoProvider> List<T> getAllProviders(
ConfiguredTarget base, Iterable<ConfiguredAspect> aspects, Class<T> providerClass) {
T baseProvider = base.getProvider(providerClass);
List<T> providers = new ArrayList<>();
if (baseProvider != null) {
providers.add(baseProvider);
}
for (ConfiguredAspect configuredAspect : aspects) {
T aspectProvider = configuredAspect.getProvider(providerClass);
if (aspectProvider == null) {
continue;
}
providers.add(aspectProvider);
}
return providers;
}
@Override
public void repr(Printer printer) {
printer.append("<merged target " + getLabel() + ">");
}
@Override
public Dict<String, Object> getProvidersDict() {
return ConfiguredTargetsUtil.getProvidersDict(this, nonBaseProviders);
}
public ConfiguredTarget getBaseConfiguredTarget() {
return base;
}
}