| // 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.analysis; |
| |
| import com.google.auto.value.AutoValue; |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.base.Preconditions; |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.collect.ImmutableMap; |
| import com.google.common.collect.ImmutableSet; |
| import com.google.devtools.build.lib.analysis.AspectCollection.AspectCycleOnPathException; |
| import com.google.devtools.build.lib.analysis.config.BuildConfiguration; |
| import com.google.devtools.build.lib.analysis.config.ConfigMatchingProvider; |
| import com.google.devtools.build.lib.analysis.config.HostTransition; |
| import com.google.devtools.build.lib.analysis.config.TransitionResolver; |
| import com.google.devtools.build.lib.analysis.config.transitions.ConfigurationTransition; |
| import com.google.devtools.build.lib.analysis.config.transitions.NoTransition; |
| import com.google.devtools.build.lib.analysis.config.transitions.NullTransition; |
| import com.google.devtools.build.lib.analysis.config.transitions.TransitionFactory; |
| import com.google.devtools.build.lib.causes.Cause; |
| import com.google.devtools.build.lib.cmdline.Label; |
| import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder; |
| import com.google.devtools.build.lib.events.Location; |
| import com.google.devtools.build.lib.packages.Aspect; |
| import com.google.devtools.build.lib.packages.AspectClass; |
| import com.google.devtools.build.lib.packages.AspectDescriptor; |
| import com.google.devtools.build.lib.packages.Attribute; |
| import com.google.devtools.build.lib.packages.Attribute.LateBoundDefault; |
| import com.google.devtools.build.lib.packages.AttributeMap; |
| import com.google.devtools.build.lib.packages.AttributeTransitionData; |
| import com.google.devtools.build.lib.packages.BuildType; |
| import com.google.devtools.build.lib.packages.ConfiguredAttributeMapper; |
| import com.google.devtools.build.lib.packages.EnvironmentGroup; |
| import com.google.devtools.build.lib.packages.InputFile; |
| import com.google.devtools.build.lib.packages.OutputFile; |
| import com.google.devtools.build.lib.packages.PackageGroup; |
| import com.google.devtools.build.lib.packages.Rule; |
| import com.google.devtools.build.lib.packages.RuleClass; |
| import com.google.devtools.build.lib.packages.Target; |
| import com.google.devtools.build.lib.syntax.EvalException; |
| import com.google.devtools.build.lib.util.OrderedSetMultimap; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.LinkedHashSet; |
| import java.util.List; |
| import java.util.Map; |
| import javax.annotation.Nullable; |
| |
| /** |
| * Resolver for dependencies between configured targets. |
| * |
| * <p>Includes logic to derive the right configurations depending on transition type. |
| */ |
| public abstract class DependencyResolver { |
| |
| /** |
| * A kind of dependency. |
| * |
| * <p>Usually an attribute, but other special-cased kinds exist, for example, for visibility or |
| * toolchains. |
| */ |
| public interface DependencyKind { |
| |
| /** |
| * The attribute through which a dependency arises. |
| * |
| * <p>Returns {@code null} for visibility, the dependency pointing from an output file to its |
| * generating rule and toolchain dependencies. |
| */ |
| @Nullable |
| Attribute getAttribute(); |
| |
| /** |
| * The aspect owning the attribute through which the dependency arises. |
| * |
| * <p>Should only be called for dependency kinds representing an attribute. |
| */ |
| @Nullable |
| AspectClass getOwningAspect(); |
| } |
| |
| /** A dependency caused by something that's not an attribute. Special cases enumerated below. */ |
| private static final class NonAttributeDependencyKind implements DependencyKind { |
| private final String name; |
| |
| private NonAttributeDependencyKind(String name) { |
| this.name = name; |
| } |
| |
| @Override |
| public Attribute getAttribute() { |
| return null; |
| } |
| |
| @Nullable |
| @Override |
| public AspectClass getOwningAspect() { |
| throw new IllegalStateException(); |
| } |
| |
| @Override |
| public String toString() { |
| return String.format("%s(%s)", getClass().getSimpleName(), this.name); |
| } |
| } |
| |
| /** A dependency for visibility. */ |
| public static final DependencyKind VISIBILITY_DEPENDENCY = |
| new NonAttributeDependencyKind("VISIBILITY"); |
| |
| /** The dependency on the rule that creates a given output file. */ |
| public static final DependencyKind OUTPUT_FILE_RULE_DEPENDENCY = |
| new NonAttributeDependencyKind("OUTPUT_FILE"); |
| |
| /** A dependency on a resolved toolchain. */ |
| public static final DependencyKind TOOLCHAIN_DEPENDENCY = |
| new NonAttributeDependencyKind("TOOLCHAIN"); |
| |
| /** A dependency through an attribute, either that of an aspect or the rule itself. */ |
| @AutoValue |
| public abstract static class AttributeDependencyKind implements DependencyKind { |
| @Override |
| public abstract Attribute getAttribute(); |
| |
| @Override |
| @Nullable |
| public abstract AspectClass getOwningAspect(); |
| |
| public static AttributeDependencyKind forRule(Attribute attribute) { |
| return new AutoValue_DependencyResolver_AttributeDependencyKind(attribute, null); |
| } |
| |
| public static AttributeDependencyKind forAspect(Attribute attribute, AspectClass owningAspect) { |
| return new AutoValue_DependencyResolver_AttributeDependencyKind( |
| attribute, Preconditions.checkNotNull(owningAspect)); |
| } |
| } |
| |
| /** |
| * What we know about a dependency edge after factoring in the properties of the configured target |
| * that the edge originates from, but not the properties of target it points to. |
| */ |
| @AutoValue |
| abstract static class PartiallyResolvedDependency { |
| public abstract Label getLabel(); |
| |
| public abstract ConfigurationTransition getTransition(); |
| |
| public abstract ImmutableList<Aspect> getPropagatingAspects(); |
| |
| static PartiallyResolvedDependency of( |
| Label label, ConfigurationTransition transition, ImmutableList<Aspect> propagatingAspects) { |
| return new AutoValue_DependencyResolver_PartiallyResolvedDependency( |
| label, transition, propagatingAspects); |
| } |
| } |
| |
| /** |
| * Returns ids for dependent nodes of a given node, sorted by attribute. Note that some |
| * dependencies do not have a corresponding attribute here, and we use the null attribute to |
| * represent those edges. |
| * |
| * <p>If {@code aspect} is null, returns the dependent nodes of the configured target node |
| * representing the given target and configuration, otherwise that of the aspect node accompanying |
| * the aforementioned configured target node for the specified aspect. |
| * |
| * <p>The values are not simply labels because this also implements the first step of applying |
| * configuration transitions, namely, split transitions. This needs to be done before the labels |
| * are resolved because late bound attributes depend on the configuration. A good example for this |
| * is @{code :cc_toolchain}. |
| * |
| * <p>The long-term goal is that most configuration transitions be applied here. However, in order |
| * to do that, we first have to eliminate transitions that depend on the rule class of the |
| * dependency. |
| * |
| * @param node the target/configuration being evaluated |
| * @param hostConfig the configuration this target would use if it was evaluated as a host tool. |
| * This is needed to support {@link LateBoundDefault#useHostConfiguration()}. |
| * @param aspect the aspect applied to this target (if any) |
| * @param configConditions resolver for config_setting labels |
| * @param toolchainContext the toolchain context for this target |
| * @param trimmingTransitionFactory the transition factory used to trim rules (note: this is a |
| * temporary feature; see the corresponding methods in ConfiguredRuleClassProvider) |
| * @return a mapping of each attribute in this rule or aspects to its dependent nodes |
| */ |
| public final OrderedSetMultimap<DependencyKind, Dependency> dependentNodeMap( |
| TargetAndConfiguration node, |
| BuildConfiguration hostConfig, |
| @Nullable Aspect aspect, |
| ImmutableMap<Label, ConfigMatchingProvider> configConditions, |
| @Nullable ToolchainContext toolchainContext, |
| @Nullable TransitionFactory<Rule> trimmingTransitionFactory) |
| throws EvalException, InterruptedException, InconsistentAspectOrderException { |
| NestedSetBuilder<Cause> rootCauses = NestedSetBuilder.stableOrder(); |
| OrderedSetMultimap<DependencyKind, Dependency> outgoingEdges = |
| dependentNodeMap( |
| node, |
| hostConfig, |
| aspect != null ? ImmutableList.of(aspect) : ImmutableList.<Aspect>of(), |
| configConditions, |
| toolchainContext, |
| rootCauses, |
| trimmingTransitionFactory); |
| if (!rootCauses.isEmpty()) { |
| throw new IllegalStateException(rootCauses.build().toList().iterator().next().toString()); |
| } |
| return outgoingEdges; |
| } |
| |
| /** |
| * Returns ids for dependent nodes of a given node, sorted by attribute. Note that some |
| * dependencies do not have a corresponding attribute here, and we use the null attribute to |
| * represent those edges. |
| * |
| * <p>If {@code aspects} is empty, returns the dependent nodes of the configured target node |
| * representing the given target and configuration. |
| * |
| * <p>Otherwise {@code aspects} represents an aspect path. The function returns dependent nodes of |
| * the entire path applied to given target and configuration. These are the depenent nodes of the |
| * last aspect in the path. |
| * |
| * <p>This also implements the first step of applying configuration transitions, namely, split |
| * transitions. This needs to be done before the labels are resolved because late bound attributes |
| * depend on the configuration. A good example for this is @{code :cc_toolchain}. |
| * |
| * <p>The long-term goal is that most configuration transitions be applied here. However, in order |
| * to do that, we first have to eliminate transitions that depend on the rule class of the |
| * dependency. |
| * |
| * @param node the target/configuration being evaluated |
| * @param hostConfig the configuration this target would use if it was evaluated as a host tool. |
| * This is needed to support {@link LateBoundDefault#useHostConfiguration()}. |
| * @param aspects the aspects applied to this target (if any) |
| * @param configConditions resolver for config_setting labels |
| * @param toolchainContext the toolchain context for this target |
| * @param trimmingTransitionFactory the transition factory used to trim rules (note: this is a |
| * temporary feature; see the corresponding methods in ConfiguredRuleClassProvider) |
| * @param rootCauses collector for dep labels that can't be (loading phase) loaded |
| * @return a mapping of each attribute in this rule or aspects to its dependent nodes |
| */ |
| public final OrderedSetMultimap<DependencyKind, Dependency> dependentNodeMap( |
| TargetAndConfiguration node, |
| BuildConfiguration hostConfig, |
| Iterable<Aspect> aspects, |
| ImmutableMap<Label, ConfigMatchingProvider> configConditions, |
| @Nullable ToolchainContext toolchainContext, |
| NestedSetBuilder<Cause> rootCauses, |
| @Nullable TransitionFactory<Rule> trimmingTransitionFactory) |
| throws EvalException, InterruptedException, InconsistentAspectOrderException { |
| Target target = node.getTarget(); |
| BuildConfiguration config = node.getConfiguration(); |
| OrderedSetMultimap<DependencyKind, Label> outgoingLabels = OrderedSetMultimap.create(); |
| |
| // TODO(bazel-team): Figure out a way to implement the below (and partiallyResolveDependencies) |
| // using |
| // LabelVisitationUtils. |
| Rule fromRule = null; |
| ConfiguredAttributeMapper attributeMap = null; |
| if (target instanceof OutputFile) { |
| Preconditions.checkNotNull(config); |
| visitTargetVisibility(node, outgoingLabels); |
| Rule rule = ((OutputFile) target).getGeneratingRule(); |
| outgoingLabels.put(OUTPUT_FILE_RULE_DEPENDENCY, rule.getLabel()); |
| } else if (target instanceof InputFile) { |
| visitTargetVisibility(node, outgoingLabels); |
| } else if (target instanceof EnvironmentGroup) { |
| visitTargetVisibility(node, outgoingLabels); |
| } else if (target instanceof Rule) { |
| fromRule = (Rule) target; |
| attributeMap = ConfiguredAttributeMapper.of(fromRule, configConditions); |
| visitRule(node, hostConfig, aspects, attributeMap, toolchainContext, outgoingLabels); |
| } else if (target instanceof PackageGroup) { |
| outgoingLabels.putAll(VISIBILITY_DEPENDENCY, ((PackageGroup) target).getIncludes()); |
| } else { |
| throw new IllegalStateException(target.getLabel().toString()); |
| } |
| |
| Map<Label, Target> targetMap = getTargets(outgoingLabels, target, rootCauses); |
| if (targetMap == null) { |
| // Dependencies could not be resolved. Try again when they are loaded by Skyframe. |
| return OrderedSetMultimap.create(); |
| } |
| |
| OrderedSetMultimap<DependencyKind, PartiallyResolvedDependency> partiallyResolvedDeps = |
| partiallyResolveDependencies( |
| outgoingLabels, fromRule, attributeMap, toolchainContext, aspects); |
| |
| OrderedSetMultimap<DependencyKind, Dependency> outgoingEdges = |
| fullyResolveDependencies( |
| partiallyResolvedDeps, targetMap, node.getConfiguration(), trimmingTransitionFactory); |
| |
| return outgoingEdges; |
| } |
| |
| /** |
| * Factor in the properties of the current rule into the dependency edge calculation. |
| * |
| * <p>The target of the dependency edges depends on two things: the rule that depends on them and |
| * the type of target they depend on. This function takes the rule into account. Accordingly, it |
| * should <b>NOT</b> get the {@link Target} instances representing the targets of the dependency |
| * edges as an argument. |
| */ |
| private OrderedSetMultimap<DependencyKind, PartiallyResolvedDependency> |
| partiallyResolveDependencies( |
| OrderedSetMultimap<DependencyKind, Label> outgoingLabels, |
| @Nullable Rule fromRule, |
| ConfiguredAttributeMapper attributeMap, |
| @Nullable ToolchainContext toolchainContext, |
| Iterable<Aspect> aspects) { |
| OrderedSetMultimap<DependencyKind, PartiallyResolvedDependency> partiallyResolvedDeps = |
| OrderedSetMultimap.create(); |
| |
| for (Map.Entry<DependencyKind, Label> entry : outgoingLabels.entries()) { |
| Label toLabel = entry.getValue(); |
| |
| if (entry.getKey() == TOOLCHAIN_DEPENDENCY) { |
| // This dependency is a toolchain. Its package has not been loaded and therefore we can't |
| // determine which aspects and which rule configuration transition we should use, so just |
| // use sensible defaults. Not depending on their package makes the error message reporting |
| // a missing toolchain a bit better. |
| // TODO(lberki): This special-casing is weird. Find a better way to depend on toolchains. |
| partiallyResolvedDeps.put( |
| TOOLCHAIN_DEPENDENCY, |
| PartiallyResolvedDependency.of( |
| toLabel, |
| // TODO(jcater): Replace this with a proper transition for the execution platform. |
| HostTransition.INSTANCE, |
| ImmutableList.of())); |
| continue; |
| } |
| |
| if (entry.getKey() == VISIBILITY_DEPENDENCY) { |
| partiallyResolvedDeps.put( |
| VISIBILITY_DEPENDENCY, |
| PartiallyResolvedDependency.of(toLabel, NullTransition.INSTANCE, ImmutableList.of())); |
| continue; |
| } |
| |
| if (entry.getKey() == OUTPUT_FILE_RULE_DEPENDENCY) { |
| partiallyResolvedDeps.put( |
| OUTPUT_FILE_RULE_DEPENDENCY, |
| PartiallyResolvedDependency.of(toLabel, NoTransition.INSTANCE, ImmutableList.of())); |
| continue; |
| } |
| |
| Attribute attribute = entry.getKey().getAttribute(); |
| ImmutableList.Builder<Aspect> propagatingAspects = ImmutableList.builder(); |
| propagatingAspects.addAll(attribute.getAspects(fromRule)); |
| collectPropagatingAspects( |
| aspects, attribute.getName(), entry.getKey().getOwningAspect(), propagatingAspects); |
| |
| Label executionPlatformLabel = null; |
| if (toolchainContext != null && toolchainContext.executionPlatform() != null) { |
| executionPlatformLabel = toolchainContext.executionPlatform().label(); |
| } |
| AttributeTransitionData attributeTransitionData = |
| AttributeTransitionData.builder() |
| .attributes(attributeMap) |
| .executionPlatform(executionPlatformLabel) |
| .build(); |
| ConfigurationTransition attributeTransition = |
| attribute.getTransitionFactory().create(attributeTransitionData); |
| partiallyResolvedDeps.put( |
| entry.getKey(), |
| PartiallyResolvedDependency.of(toLabel, attributeTransition, propagatingAspects.build())); |
| } |
| return partiallyResolvedDeps; |
| } |
| |
| /** |
| * Factor in the properties of the target where the dependency points to in the dependency edge |
| * calculation. |
| * |
| * <p>The target of the dependency edges depends on two things: the rule that depends on them and |
| * the type of target they depend on. This function takes the rule into account. Accordingly, it |
| * should <b>NOT</b> get the {@link Rule} instance representing the rule whose dependencies are |
| * being calculated as an argument or its attributes and it should <b>NOT</b> do anything with the |
| * keys of {@code partiallyResolvedDeps} other than passing them on to the output map. |
| */ |
| private OrderedSetMultimap<DependencyKind, Dependency> fullyResolveDependencies( |
| OrderedSetMultimap<DependencyKind, PartiallyResolvedDependency> partiallyResolvedDeps, |
| Map<Label, Target> targetMap, |
| BuildConfiguration originalConfiguration, |
| @Nullable TransitionFactory<Rule> trimmingTransitionFactory) |
| throws InconsistentAspectOrderException { |
| OrderedSetMultimap<DependencyKind, Dependency> outgoingEdges = OrderedSetMultimap.create(); |
| |
| for (Map.Entry<DependencyKind, PartiallyResolvedDependency> entry : |
| partiallyResolvedDeps.entries()) { |
| PartiallyResolvedDependency dep = entry.getValue(); |
| |
| Target toTarget = targetMap.get(dep.getLabel()); |
| if (toTarget == null) { |
| // Dependency pointing to non-existent target. This error was reported in getTargets(), so |
| // we can just ignore this dependency. |
| continue; |
| } |
| |
| ConfigurationTransition transition = |
| TransitionResolver.evaluateTransition( |
| originalConfiguration, dep.getTransition(), toTarget, trimmingTransitionFactory); |
| |
| AspectCollection requiredAspects = |
| filterPropagatingAspects(dep.getPropagatingAspects(), toTarget); |
| |
| outgoingEdges.put( |
| entry.getKey(), |
| Dependency.withTransitionAndAspects(dep.getLabel(), transition, requiredAspects)); |
| } |
| return outgoingEdges; |
| } |
| |
| private void visitRule( |
| TargetAndConfiguration node, |
| BuildConfiguration hostConfig, |
| Iterable<Aspect> aspects, |
| ConfiguredAttributeMapper attributeMap, |
| @Nullable ToolchainContext toolchainContext, |
| OrderedSetMultimap<DependencyKind, Label> outgoingLabels) |
| throws EvalException { |
| Preconditions.checkArgument(node.getTarget() instanceof Rule, node); |
| BuildConfiguration ruleConfig = Preconditions.checkNotNull(node.getConfiguration(), node); |
| Rule rule = (Rule) node.getTarget(); |
| |
| attributeMap.validateAttributes(); |
| |
| visitTargetVisibility(node, outgoingLabels); |
| resolveAttributes(outgoingLabels, rule, attributeMap, aspects, ruleConfig, hostConfig); |
| |
| // Add the rule's visibility labels (which may come from the rule or from package defaults). |
| addExplicitDeps(outgoingLabels, rule, "visibility", rule.getVisibility().getDependencyLabels()); |
| |
| // Add package default constraints when the rule doesn't explicitly declare them. |
| // |
| // Note that this can have subtle implications for constraint semantics. For example: say that |
| // package defaults declare compatibility with ':foo' and rule R declares compatibility with |
| // ':bar'. Does that mean that R is compatible with [':foo', ':bar'] or just [':bar']? In other |
| // words, did R's author intend to add additional compatibility to the package defaults or to |
| // override them? More severely, what if package defaults "restrict" support to just [':baz']? |
| // Should R's declaration signify [':baz'] + ['bar'], [ORIGINAL_DEFAULTS] + ['bar'], or |
| // something else? |
| // |
| // Rather than try to answer these questions with possibly confusing logic, we take the |
| // simple approach of assigning the rule's "restriction" attribute to the rule-declared value if |
| // it exists, else the package defaults value (and likewise for "compatibility"). This may not |
| // always provide what users want, but it makes it easy for them to understand how rule |
| // declarations and package defaults intermix (and how to refactor them to get what they want). |
| // |
| // An alternative model would be to apply the "rule declaration" / "rule class defaults" |
| // relationship, i.e. the rule class' "compatibility" and "restriction" declarations are merged |
| // to generate a set of default environments, then the rule's declarations are independently |
| // processed on top of that. This protects against obscure coupling behavior between |
| // declarations from wildly different places (e.g. it offers clear answers to the examples posed |
| // above). But within the scope of a single package it seems better to keep the model simple and |
| // make the user responsible for resolving ambiguities. |
| if (!rule.isAttributeValueExplicitlySpecified(RuleClass.COMPATIBLE_ENVIRONMENT_ATTR)) { |
| addExplicitDeps( |
| outgoingLabels, |
| rule, |
| RuleClass.COMPATIBLE_ENVIRONMENT_ATTR, |
| rule.getPackage().getDefaultCompatibleWith()); |
| } |
| if (!rule.isAttributeValueExplicitlySpecified(RuleClass.RESTRICTED_ENVIRONMENT_ATTR)) { |
| addExplicitDeps( |
| outgoingLabels, |
| rule, |
| RuleClass.RESTRICTED_ENVIRONMENT_ATTR, |
| rule.getPackage().getDefaultRestrictedTo()); |
| } |
| |
| if (toolchainContext != null) { |
| outgoingLabels.putAll(TOOLCHAIN_DEPENDENCY, toolchainContext.resolvedToolchainLabels()); |
| } |
| |
| if (!rule.isAttributeValueExplicitlySpecified(RuleClass.APPLICABLE_LICENSES_ATTR)) { |
| addExplicitDeps( |
| outgoingLabels, |
| rule, |
| RuleClass.APPLICABLE_LICENSES_ATTR, |
| rule.getPackage().getDefaultApplicableLicenses()); |
| } |
| } |
| |
| private void resolveAttributes( |
| OrderedSetMultimap<DependencyKind, Label> outgoingLabels, |
| Rule rule, |
| ConfiguredAttributeMapper attributeMap, |
| Iterable<Aspect> aspects, |
| BuildConfiguration ruleConfig, |
| BuildConfiguration hostConfig) { |
| Label ruleLabel = rule.getLabel(); |
| for (AttributeDependencyKind dependencyKind : getAttributes(rule, aspects)) { |
| Attribute attribute = dependencyKind.getAttribute(); |
| if (!attribute.getCondition().apply(attributeMap) |
| // Not only is resolving CONFIG_SETTING_DEPS_ATTRIBUTE deps here wasteful, since the only |
| // place they're used is in ConfiguredTargetFunction.getConfigConditions, but it actually |
| // breaks trimming as shown by |
| // FeatureFlagManualTrimmingTest#featureFlagInUnusedSelectBranchButNotInTransitiveConfigs_DoesNotError |
| // because it resolves a dep that trimming (correctly) doesn't account for because it's |
| // part of an unchosen select() branch. |
| || attribute.getName().equals(RuleClass.CONFIG_SETTING_DEPS_ATTRIBUTE)) { |
| continue; |
| } |
| |
| if (attribute.getType() == BuildType.OUTPUT |
| || attribute.getType() == BuildType.OUTPUT_LIST |
| || attribute.getType() == BuildType.NODEP_LABEL |
| || attribute.getType() == BuildType.NODEP_LABEL_LIST) { |
| // These types invoke visitLabels() so that they are reported in "bazel query" but do not |
| // create a dependency. Maybe it's better to remove that, but then the labels() query |
| // function would need to be rethought. |
| continue; |
| } |
| |
| Object attributeValue; |
| if (attribute.isImplicit()) { |
| // Since the attributes that come from aspects do not appear in attributeMap, we have to |
| // get their values from somewhere else. This incidentally means that aspects attributes |
| // are not configurable. It would be nice if that wasn't the case, but we'd have to revamp |
| // how attribute mapping works, which is a large chunk of work. |
| attributeValue = |
| dependencyKind.getOwningAspect() == null |
| ? attributeMap.get(attribute.getName(), attribute.getType()) |
| : attribute.getDefaultValue(rule); |
| } else if (attribute.isLateBound()) { |
| attributeValue = |
| resolveLateBoundDefault(rule, attributeMap, attribute, ruleConfig, hostConfig); |
| } else if (attributeMap.has(attribute.getName())) { |
| // This condition is false for aspect attributes that do not give rise to dependencies |
| // because attributes that come from aspects do not appear in attributeMap (see the |
| // comment in the case that handles implicit attributes) |
| attributeValue = attributeMap.get(attribute.getName(), attribute.getType()); |
| } else { |
| continue; |
| } |
| |
| if (attributeValue == null) { |
| continue; |
| } |
| |
| List<Label> labels = new ArrayList<>(); |
| attribute |
| .getType() |
| .visitLabels( |
| (depLabel, ctx) -> { |
| labels.add(ruleLabel.resolveRepositoryRelative(depLabel)); |
| }, |
| attributeValue, |
| null); |
| |
| outgoingLabels.putAll(dependencyKind, labels); |
| } |
| } |
| |
| @VisibleForTesting(/* used to test LateBoundDefaults' default values */ ) |
| public static <FragmentT> Object resolveLateBoundDefault( |
| Rule rule, |
| AttributeMap attributeMap, |
| Attribute attribute, |
| BuildConfiguration ruleConfig, |
| BuildConfiguration hostConfig) { |
| Preconditions.checkState(!attribute.getTransitionFactory().isSplit()); |
| @SuppressWarnings("unchecked") |
| LateBoundDefault<FragmentT, ?> lateBoundDefault = |
| (LateBoundDefault<FragmentT, ?>) attribute.getLateBoundDefault(); |
| BuildConfiguration attributeConfig = |
| lateBoundDefault.useHostConfiguration() ? hostConfig : ruleConfig; |
| |
| Class<FragmentT> fragmentClass = lateBoundDefault.getFragmentClass(); |
| // TODO(b/65746853): remove this when nothing uses it anymore |
| if (BuildConfiguration.class.equals(fragmentClass)) { |
| return lateBoundDefault.resolve(rule, attributeMap, fragmentClass.cast(attributeConfig)); |
| } |
| if (Void.class.equals(fragmentClass)) { |
| return lateBoundDefault.resolve(rule, attributeMap, null); |
| |
| } |
| @SuppressWarnings("unchecked") |
| FragmentT fragment = |
| fragmentClass.cast( |
| attributeConfig.getFragment( |
| (Class<? extends BuildConfiguration.Fragment>) fragmentClass)); |
| if (fragment == null) { |
| return null; |
| } |
| return lateBoundDefault.resolve(rule, attributeMap, fragment); |
| } |
| |
| /** |
| * Adds new dependencies to the given rule under the given attribute name |
| * |
| * @param attrName the name of the attribute to add dependency labels to |
| * @param labels the dependencies to add |
| */ |
| private void addExplicitDeps( |
| OrderedSetMultimap<DependencyKind, Label> outgoingLabels, |
| Rule rule, |
| String attrName, |
| Collection<Label> labels) { |
| if (!rule.isAttrDefined(attrName, BuildType.LABEL_LIST) |
| && !rule.isAttrDefined(attrName, BuildType.NODEP_LABEL_LIST)) { |
| return; |
| } |
| Attribute attribute = rule.getRuleClassObject().getAttributeByName(attrName); |
| outgoingLabels.putAll(AttributeDependencyKind.forRule(attribute), labels); |
| } |
| |
| /** |
| * Collects the aspects from {@code aspectPath} that need to be propagated along the attribute |
| * {@code attributeName}. |
| * |
| * <p>It can happen that some of the aspects cannot be propagated if the dependency doesn't have a |
| * provider that's required by them. These will be filtered out after the rule class of the |
| * dependency is known. |
| */ |
| private static void collectPropagatingAspects( |
| Iterable<Aspect> aspectPath, |
| String attributeName, |
| @Nullable AspectClass aspectOwningAttribute, |
| ImmutableList.Builder<Aspect> filteredAspectPath) { |
| for (Aspect aspect : aspectPath) { |
| if (aspect.getAspectClass().equals(aspectOwningAttribute)) { |
| // Do not propagate over the aspect's own attributes. |
| continue; |
| } |
| |
| if (aspect.getDefinition().propagateAlong(attributeName)) { |
| filteredAspectPath.add(aspect); |
| } |
| } |
| } |
| |
| /** Returns the attributes that should be visited for this rule/aspect combination. */ |
| private List<AttributeDependencyKind> getAttributes(Rule rule, Iterable<Aspect> aspects) { |
| ImmutableList.Builder<AttributeDependencyKind> result = ImmutableList.builder(); |
| // If processing aspects, aspect attribute names may conflict with the attribute names of |
| // rules they attach to. If this occurs, the highest-level aspect attribute takes precedence. |
| LinkedHashSet<String> aspectProcessedAttributes = new LinkedHashSet<>(); |
| |
| for (Aspect aspect : aspects) { |
| for (Attribute attribute : aspect.getDefinition().getAttributes().values()) { |
| if (!aspectProcessedAttributes.contains(attribute.getName())) { |
| result.add(AttributeDependencyKind.forAspect(attribute, aspect.getAspectClass())); |
| aspectProcessedAttributes.add(attribute.getName()); |
| } |
| } |
| } |
| List<Attribute> ruleDefs = rule.getRuleClassObject().getAttributes(); |
| for (Attribute attribute : ruleDefs) { |
| if (!aspectProcessedAttributes.contains(attribute.getName())) { |
| result.add(AttributeDependencyKind.forRule(attribute)); |
| } |
| } |
| return result.build(); |
| } |
| |
| /** |
| * Filter the set of aspects that are to be propagated according to the dependency type and the |
| * set of advertised providers of the dependency. |
| */ |
| private AspectCollection filterPropagatingAspects(ImmutableList<Aspect> aspects, Target toTarget) |
| throws InconsistentAspectOrderException { |
| if (toTarget instanceof OutputFile) { |
| aspects = |
| aspects.stream() |
| .filter(aspect -> aspect.getDefinition().applyToGeneratingRules()) |
| .collect(ImmutableList.toImmutableList()); |
| toTarget = ((OutputFile) toTarget).getGeneratingRule(); |
| } |
| |
| if (!(toTarget instanceof Rule) || aspects.isEmpty()) { |
| return AspectCollection.EMPTY; |
| } |
| |
| Rule toRule = (Rule) toTarget; |
| ImmutableList.Builder<Aspect> filteredAspectPath = ImmutableList.builder(); |
| ImmutableSet.Builder<AspectDescriptor> visibleAspects = ImmutableSet.builder(); |
| |
| for (Aspect aspect : aspects) { |
| if (aspect |
| .getDefinition() |
| .getRequiredProviders() |
| .isSatisfiedBy(toRule.getRuleClassObject().getAdvertisedProviders())) { |
| filteredAspectPath.add(aspect); |
| visibleAspects.add(aspect.getDescriptor()); |
| } |
| } |
| try { |
| return AspectCollection.create(filteredAspectPath.build(), visibleAspects.build()); |
| } catch (AspectCycleOnPathException e) { |
| throw new InconsistentAspectOrderException(toTarget, e); |
| } |
| } |
| |
| private void visitTargetVisibility( |
| TargetAndConfiguration node, OrderedSetMultimap<DependencyKind, Label> outgoingLabels) { |
| Target target = node.getTarget(); |
| outgoingLabels.putAll(VISIBILITY_DEPENDENCY, target.getVisibility().getDependencyLabels()); |
| } |
| |
| /** |
| * Hook for the error case when an invalid package group reference is found. |
| * |
| * @param node the package group node with the includes attribute |
| * @param label the invalid reference |
| */ |
| protected abstract void invalidPackageGroupReferenceHook(TargetAndConfiguration node, |
| Label label); |
| |
| /** |
| * Returns the targets for the given labels. |
| * |
| * <p>Returns null if any targets are not ready to be returned at this moment because of missing |
| * Skyframe dependencies. If getTargets returns null once or more during a {@link |
| * #dependentNodeMap} call, the results of that call will be incomplete. As is usual in these |
| * situation, the caller must return control to Skyframe and wait for the SkyFunction to be |
| * restarted, at which point the requested dependencies will be available. |
| */ |
| protected abstract Map<Label, Target> getTargets( |
| OrderedSetMultimap<DependencyKind, Label> labelMap, |
| Target fromTarget, |
| NestedSetBuilder<Cause> rootCauses) |
| throws InterruptedException; |
| |
| /** |
| * Signals an inconsistency on aspect path: an aspect occurs twice on the path and |
| * the second occurrence sees a different set of aspects. |
| * |
| * {@see AspectCycleOnPathException} |
| */ |
| public class InconsistentAspectOrderException extends Exception { |
| private final Location location; |
| |
| public InconsistentAspectOrderException(Target target, AspectCycleOnPathException e) { |
| super(String.format("%s (when propagating to %s)", e.getMessage(), target.getLabel())); |
| this.location = target.getLocation(); |
| } |
| |
| public Location getLocation() { |
| return location; |
| } |
| } |
| } |
