| // 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.common.collect.ArrayListMultimap; |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.collect.ImmutableSet; |
| import com.google.common.collect.ListMultimap; |
| import com.google.common.collect.Sets; |
| import com.google.devtools.build.lib.analysis.config.BuildConfiguration; |
| import com.google.devtools.build.lib.analysis.config.ConfigMatchingProvider; |
| import com.google.devtools.build.lib.cmdline.Label; |
| import com.google.devtools.build.lib.collect.ImmutableSortedKeyListMultimap; |
| import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder; |
| import com.google.devtools.build.lib.packages.Aspect; |
| import com.google.devtools.build.lib.packages.AspectClass; |
| import com.google.devtools.build.lib.packages.AspectDefinition; |
| import com.google.devtools.build.lib.packages.Attribute; |
| import com.google.devtools.build.lib.packages.Attribute.LateBoundDefault; |
| import com.google.devtools.build.lib.packages.Attribute.SplitTransition; |
| import com.google.devtools.build.lib.packages.AttributeMap; |
| import com.google.devtools.build.lib.packages.BuildType; |
| import com.google.devtools.build.lib.packages.EnvironmentGroup; |
| import com.google.devtools.build.lib.packages.InputFile; |
| import com.google.devtools.build.lib.packages.NoSuchThingException; |
| 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.syntax.EvalUtils; |
| import com.google.devtools.build.lib.syntax.Type; |
| import com.google.devtools.build.lib.util.Preconditions; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.LinkedHashSet; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.regex.Pattern; |
| import java.util.regex.PatternSyntaxException; |
| |
| 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 { |
| |
| protected DependencyResolver() { |
| } |
| |
| /** |
| * 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. Visibility attributes are only visited if {@code visitVisibility} is |
| * {@code true}. |
| * |
| * <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. |
| */ |
| public final ListMultimap<Attribute, Dependency> dependentNodeMap( |
| TargetAndConfiguration node, |
| BuildConfiguration hostConfig, |
| Aspect aspect, |
| Set<ConfigMatchingProvider> configConditions) |
| throws EvalException, InterruptedException { |
| NestedSetBuilder<Label> rootCauses = NestedSetBuilder.<Label>stableOrder(); |
| ListMultimap<Attribute, Dependency> outgoingEdges = |
| dependentNodeMap(node, hostConfig, aspect, configConditions, rootCauses); |
| if (!rootCauses.isEmpty()) { |
| throw new IllegalStateException(rootCauses.build().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. Visibility attributes are only visited if {@code visitVisibility} is |
| * {@code true}. |
| * |
| * <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. |
| */ |
| public final ListMultimap<Attribute, Dependency> dependentNodeMap( |
| TargetAndConfiguration node, |
| BuildConfiguration hostConfig, |
| Aspect aspect, |
| Set<ConfigMatchingProvider> configConditions, |
| NestedSetBuilder<Label> rootCauses) |
| throws EvalException, InterruptedException { |
| Target target = node.getTarget(); |
| BuildConfiguration config = node.getConfiguration(); |
| ListMultimap<Attribute, Dependency> outgoingEdges = ArrayListMultimap.create(); |
| if (target instanceof OutputFile) { |
| Preconditions.checkNotNull(config); |
| visitTargetVisibility(node, rootCauses, outgoingEdges.get(null)); |
| Rule rule = ((OutputFile) target).getGeneratingRule(); |
| outgoingEdges.put(null, Dependency.withConfiguration(rule.getLabel(), config)); |
| } else if (target instanceof InputFile) { |
| visitTargetVisibility(node, rootCauses, outgoingEdges.get(null)); |
| } else if (target instanceof EnvironmentGroup) { |
| visitTargetVisibility(node, rootCauses, outgoingEdges.get(null)); |
| } else if (target instanceof Rule) { |
| Preconditions.checkNotNull(config); |
| visitTargetVisibility(node, rootCauses, outgoingEdges.get(null)); |
| Rule rule = (Rule) target; |
| ListMultimap<Attribute, LabelAndConfiguration> labelMap = |
| resolveAttributes( |
| rule, |
| aspect != null ? aspect.getDefinition() : null, |
| config, |
| hostConfig, |
| configConditions); |
| visitRule(rule, aspect, labelMap, rootCauses, outgoingEdges); |
| } else if (target instanceof PackageGroup) { |
| visitPackageGroup(node, (PackageGroup) target, rootCauses, outgoingEdges.get(null)); |
| } else { |
| throw new IllegalStateException(target.getLabel().toString()); |
| } |
| return outgoingEdges; |
| } |
| |
| private ListMultimap<Attribute, LabelAndConfiguration> resolveAttributes( |
| Rule rule, AspectDefinition aspect, BuildConfiguration configuration, |
| BuildConfiguration hostConfiguration, Set<ConfigMatchingProvider> configConditions) |
| throws EvalException, InterruptedException { |
| ConfiguredAttributeMapper attributeMap = ConfiguredAttributeMapper.of(rule, configConditions); |
| attributeMap.validateAttributes(); |
| List<Attribute> attributes; |
| if (aspect == null) { |
| attributes = rule.getRuleClassObject().getAttributes(); |
| } else { |
| attributes = new ArrayList<>(); |
| attributes.addAll(rule.getRuleClassObject().getAttributes()); |
| attributes.addAll(aspect.getAttributes().values()); |
| } |
| |
| ImmutableSortedKeyListMultimap.Builder<Attribute, LabelAndConfiguration> result = |
| ImmutableSortedKeyListMultimap.builder(); |
| |
| resolveExplicitAttributes(rule, configuration, attributeMap, result); |
| resolveImplicitAttributes(rule, configuration, attributeMap, attributes, result); |
| resolveLateBoundAttributes(rule, configuration, hostConfiguration, attributeMap, attributes, |
| result); |
| |
| // Add the rule's visibility labels (which may come from the rule or from package defaults). |
| addExplicitDeps(result, rule, "visibility", rule.getVisibility().getDependencyLabels(), |
| configuration); |
| |
| // 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(result, rule, RuleClass.COMPATIBLE_ENVIRONMENT_ATTR, |
| rule.getPackage().getDefaultCompatibleWith(), configuration); |
| } |
| if (!rule.isAttributeValueExplicitlySpecified(RuleClass.RESTRICTED_ENVIRONMENT_ATTR)) { |
| addExplicitDeps(result, rule, RuleClass.RESTRICTED_ENVIRONMENT_ATTR, |
| rule.getPackage().getDefaultRestrictedTo(), configuration); |
| } |
| |
| return result.build(); |
| } |
| |
| /** |
| * Adds new dependencies to the given rule under the given attribute name |
| * |
| * @param result the builder for the attribute --> dependency labels map |
| * @param rule the rule being evaluated |
| * @param attrName the name of the attribute to add dependency labels to |
| * @param labels the dependencies to add |
| * @param configuration the configuration to apply to those dependencies |
| */ |
| private void addExplicitDeps( |
| ImmutableSortedKeyListMultimap.Builder<Attribute, LabelAndConfiguration> result, Rule rule, |
| String attrName, Iterable<Label> labels, BuildConfiguration configuration) { |
| if (!rule.isAttrDefined(attrName, BuildType.LABEL_LIST) |
| && !rule.isAttrDefined(attrName, BuildType.NODEP_LABEL_LIST)) { |
| return; |
| } |
| Attribute attribute = rule.getRuleClassObject().getAttributeByName(attrName); |
| for (Label label : labels) { |
| // The configuration must be the configuration after the first transition step (applying |
| // split configurations). The proper configuration (null) for package groups will be set |
| // later. |
| result.put(attribute, LabelAndConfiguration.of(label, configuration)); |
| } |
| } |
| |
| private void resolveExplicitAttributes(Rule rule, final BuildConfiguration configuration, |
| AttributeMap attributes, |
| final ImmutableSortedKeyListMultimap.Builder<Attribute, LabelAndConfiguration> builder) { |
| attributes.visitLabels( |
| new AttributeMap.AcceptsLabelAttribute() { |
| @Override |
| public void acceptLabelAttribute(Label label, Attribute attribute) { |
| String attributeName = attribute.getName(); |
| if (attributeName.equals("abi_deps")) { |
| // abi_deps is handled specially: we visit only the branch that |
| // needs to be taken based on the configuration. |
| return; |
| } |
| |
| if (attribute.getType() == BuildType.NODEP_LABEL) { |
| return; |
| } |
| |
| if (attribute.isImplicit() || attribute.isLateBound()) { |
| return; |
| } |
| |
| builder.put(attribute, LabelAndConfiguration.of(label, configuration)); |
| } |
| }); |
| |
| // TODO(bazel-team): Remove this in favor of the new configurable attributes. |
| if (attributes.getAttributeDefinition("abi_deps") != null) { |
| Attribute depsAttribute = attributes.getAttributeDefinition("deps"); |
| MakeVariableExpander.Context context = new ConfigurationMakeVariableContext( |
| rule.getPackage(), configuration); |
| String abi = null; |
| try { |
| abi = MakeVariableExpander.expand(attributes.get("abi", Type.STRING), context); |
| } catch (MakeVariableExpander.ExpansionException e) { |
| // Ignore this. It will be handled during the analysis phase. |
| } |
| |
| if (abi != null) { |
| for (Map.Entry<String, List<Label>> entry |
| : attributes.get("abi_deps", BuildType.LABEL_LIST_DICT).entrySet()) { |
| try { |
| if (Pattern.matches(entry.getKey(), abi)) { |
| for (Label label : entry.getValue()) { |
| builder.put(depsAttribute, LabelAndConfiguration.of(label, configuration)); |
| } |
| } |
| } catch (PatternSyntaxException e) { |
| // Ignore this. It will be handled during the analysis phase. |
| } |
| } |
| } |
| } |
| } |
| |
| private void resolveImplicitAttributes(Rule rule, BuildConfiguration configuration, |
| AttributeMap attributeMap, Iterable<Attribute> attributes, |
| ImmutableSortedKeyListMultimap.Builder<Attribute, LabelAndConfiguration> builder) { |
| // 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. |
| Label ruleLabel = rule.getLabel(); |
| ImmutableSet<String> mappedAttributes = ImmutableSet.copyOf(attributeMap.getAttributeNames()); |
| for (Attribute attribute : attributes) { |
| if (!attribute.isImplicit() || !attribute.getCondition().apply(attributeMap)) { |
| continue; |
| } |
| |
| if (attribute.getType() == BuildType.LABEL) { |
| Label label = mappedAttributes.contains(attribute.getName()) |
| ? attributeMap.get(attribute.getName(), BuildType.LABEL) |
| : BuildType.LABEL.cast(attribute.getDefaultValue(rule)); |
| |
| if (label != null) { |
| label = ruleLabel.resolveRepositoryRelative(label); |
| builder.put(attribute, LabelAndConfiguration.of(label, configuration)); |
| } |
| } else if (attribute.getType() == BuildType.LABEL_LIST) { |
| List<Label> labelList; |
| if (mappedAttributes.contains(attribute.getName())) { |
| labelList = new ArrayList<>(); |
| for (Label label : attributeMap.get(attribute.getName(), BuildType.LABEL_LIST)) { |
| labelList.add(label); |
| } |
| } else { |
| labelList = BuildType.LABEL_LIST.cast(attribute.getDefaultValue(rule)); |
| } |
| |
| for (Label label : labelList) { |
| label = ruleLabel.resolveRepositoryRelative(label); |
| builder.put(attribute, LabelAndConfiguration.of(label, configuration)); |
| } |
| } |
| } |
| } |
| |
| private void resolveLateBoundAttributes( |
| Rule rule, |
| BuildConfiguration configuration, |
| BuildConfiguration hostConfiguration, |
| AttributeMap attributeMap, |
| Iterable<Attribute> attributes, |
| ImmutableSortedKeyListMultimap.Builder<Attribute, LabelAndConfiguration> builder) |
| throws EvalException, InterruptedException { |
| for (Attribute attribute : attributes) { |
| if (!attribute.isLateBound() || !attribute.getCondition().apply(attributeMap)) { |
| continue; |
| } |
| |
| List<BuildConfiguration> actualConfigurations = ImmutableList.of(configuration); |
| if (attribute.getConfigurationTransition() instanceof SplitTransition<?>) { |
| Preconditions.checkState(attribute.getConfigurator() == null); |
| // TODO(bazel-team): This ends up applying the split transition twice, both here and in the |
| // visitRule method below - this is not currently a problem, because the configuration graph |
| // never contains nested split transitions, so the second application is idempotent. |
| actualConfigurations = configuration.getSplitConfigurations( |
| (SplitTransition<?>) attribute.getConfigurationTransition()); |
| } |
| |
| for (BuildConfiguration actualConfig : actualConfigurations) { |
| @SuppressWarnings("unchecked") |
| LateBoundDefault<BuildConfiguration> lateBoundDefault = |
| (LateBoundDefault<BuildConfiguration>) attribute.getLateBoundDefault(); |
| if (lateBoundDefault.useHostConfiguration()) { |
| actualConfig = hostConfiguration; |
| } |
| // TODO(bazel-team): This might be too expensive - can we cache this somehow? |
| if (!lateBoundDefault.getRequiredConfigurationFragments().isEmpty()) { |
| if (!actualConfig.hasAllFragments(lateBoundDefault.getRequiredConfigurationFragments())) { |
| continue; |
| } |
| } |
| |
| // TODO(bazel-team): We should check if the implementation tries to access an undeclared |
| // fragment. |
| Object actualValue = lateBoundDefault.getDefault(rule, attributeMap, actualConfig); |
| if (EvalUtils.isNullOrNone(actualValue)) { |
| continue; |
| } |
| try { |
| if (attribute.getType() == BuildType.LABEL) { |
| Label label = rule.getLabel().resolveRepositoryRelative( |
| BuildType.LABEL.cast(actualValue)); |
| builder.put(attribute, LabelAndConfiguration.of(label, actualConfig)); |
| } else if (attribute.getType() == BuildType.LABEL_LIST) { |
| for (Label label : BuildType.LABEL_LIST.cast(actualValue)) { |
| builder.put(attribute, LabelAndConfiguration.of( |
| rule.getLabel().resolveRepositoryRelative(label), |
| actualConfig)); |
| } |
| } else { |
| throw new IllegalStateException( |
| String.format( |
| "Late bound attribute '%s' is not a label or a label list", |
| attribute.getName())); |
| } |
| } catch (ClassCastException e) { // From either of the cast calls above. |
| throw new EvalException( |
| rule.getLocation(), |
| String.format( |
| "When computing the default value of %s, expected '%s', got '%s'", |
| attribute.getName(), |
| attribute.getType(), |
| EvalUtils.getDataTypeName(actualValue, true))); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Converts the given multimap of attributes to labels into a multi map of attributes to |
| * {@link Dependency} objects using the proper configuration transition for each attribute. |
| * |
| * @throws IllegalArgumentException if the {@code node} does not refer to a {@link Rule} instance |
| */ |
| public final Collection<Dependency> resolveRuleLabels( |
| TargetAndConfiguration node, ListMultimap<Attribute, |
| LabelAndConfiguration> labelMap, NestedSetBuilder<Label> rootCauses) { |
| Preconditions.checkArgument(node.getTarget() instanceof Rule); |
| Rule rule = (Rule) node.getTarget(); |
| ListMultimap<Attribute, Dependency> outgoingEdges = ArrayListMultimap.create(); |
| visitRule(rule, labelMap, rootCauses, outgoingEdges); |
| return outgoingEdges.values(); |
| } |
| |
| private void visitPackageGroup(TargetAndConfiguration node, PackageGroup packageGroup, |
| NestedSetBuilder<Label> rootCauses, Collection<Dependency> outgoingEdges) { |
| for (Label label : packageGroup.getIncludes()) { |
| Target target = getTarget(packageGroup, label, rootCauses); |
| if (target == null) { |
| continue; |
| } |
| if (!(target instanceof PackageGroup)) { |
| // Note that this error could also be caught in PackageGroupConfiguredTarget, but since |
| // these have the null configuration, visiting the corresponding target would trigger an |
| // analysis of a rule with a null configuration, which doesn't work. |
| invalidPackageGroupReferenceHook(node, label); |
| continue; |
| } |
| |
| outgoingEdges.add(Dependency.withNullConfiguration(label)); |
| } |
| } |
| |
| private ImmutableSet<Aspect> requiredAspects( |
| Aspect aspect, Attribute attribute, Target target, Rule originalRule) { |
| if (!(target instanceof Rule)) { |
| return ImmutableSet.of(); |
| } |
| |
| Set<Aspect> aspectCandidates = extractAspectCandidates(aspect, attribute, originalRule); |
| RuleClass ruleClass = ((Rule) target).getRuleClassObject(); |
| ImmutableSet.Builder<Aspect> result = ImmutableSet.builder(); |
| for (Aspect candidateClass : aspectCandidates) { |
| if (Sets.difference( |
| candidateClass.getDefinition().getRequiredProviders(), |
| ruleClass.getAdvertisedProviders()) |
| .isEmpty()) { |
| result.add(candidateClass); |
| } |
| } |
| return result.build(); |
| } |
| |
| private static Set<Aspect> extractAspectCandidates( |
| Aspect aspectWithParameters, Attribute attribute, Rule originalRule) { |
| // The order of this set will be deterministic. This is necessary because this order eventually |
| // influences the order in which aspects are merged into the main configured target, which in |
| // turn influences which aspect takes precedence if two emit the same provider (maybe this |
| // should be an error) |
| Set<Aspect> aspectCandidates = new LinkedHashSet<>(); |
| aspectCandidates.addAll(attribute.getAspects(originalRule)); |
| if (aspectWithParameters != null) { |
| for (AspectClass aspect : |
| aspectWithParameters.getDefinition().getAttributeAspects().get(attribute.getName())) { |
| aspectCandidates.add(new Aspect(aspect, aspectWithParameters.getParameters())); |
| } |
| } |
| return aspectCandidates; |
| } |
| |
| private void visitRule(Rule rule, ListMultimap<Attribute, LabelAndConfiguration> labelMap, |
| NestedSetBuilder<Label> rootCauses, ListMultimap<Attribute, Dependency> outgoingEdges) { |
| visitRule(rule, /*aspect=*/ null, labelMap, rootCauses, outgoingEdges); |
| } |
| |
| private void visitRule( |
| Rule rule, |
| Aspect aspect, |
| ListMultimap<Attribute, LabelAndConfiguration> labelMap, |
| NestedSetBuilder<Label> rootCauses, |
| ListMultimap<Attribute, Dependency> outgoingEdges) { |
| Preconditions.checkNotNull(labelMap); |
| for (Map.Entry<Attribute, Collection<LabelAndConfiguration>> entry : |
| labelMap.asMap().entrySet()) { |
| Attribute attribute = entry.getKey(); |
| for (LabelAndConfiguration dep : entry.getValue()) { |
| Label label = dep.getLabel(); |
| BuildConfiguration config = dep.getConfiguration(); |
| |
| Target toTarget = getTarget(rule, label, rootCauses); |
| if (toTarget == null) { |
| continue; |
| } |
| BuildConfiguration.TransitionApplier transitionApplier = config.getTransitionApplier(); |
| if (config.useDynamicConfigurations() && config.isHostConfiguration() |
| && !BuildConfiguration.usesNullConfiguration(toTarget)) { |
| // This condition is needed because resolveLateBoundAttributes may switch config to |
| // the host configuration, which is the only case DependencyResolver applies a |
| // configuration transition outside of this method. We need to reflect that |
| // transition in the results of this method, but config.evaluateTransition is hard-set |
| // to return a NONE transition when the input is a host config. Since the outside |
| // caller originally passed the *original* value of config (before the possible |
| // switch), it can mistakenly interpret the result as a NONE transition from the |
| // original value of config. This condition fixes that. Another fix would be to have |
| // config.evaluateTransition return a HOST transition when the input config is a host, |
| // but since this blemish is specific to DependencyResolver it seems best to keep the |
| // fix here. |
| // TODO(bazel-team): eliminate this special case by passing transitionApplier to |
| // resolveLateBoundAttributes, so that method uses the same interface for transitions. |
| transitionApplier.applyTransition(Attribute.ConfigurationTransition.HOST); |
| } else { |
| config.evaluateTransition(rule, attribute, toTarget, transitionApplier); |
| } |
| for (Dependency dependency : |
| transitionApplier.getDependencies( |
| label, requiredAspects(aspect, attribute, toTarget, rule))) { |
| outgoingEdges.put( |
| entry.getKey(), |
| dependency); |
| } |
| } |
| } |
| } |
| |
| private void visitTargetVisibility(TargetAndConfiguration node, |
| NestedSetBuilder<Label> rootCauses, Collection<Dependency> outgoingEdges) { |
| Target target = node.getTarget(); |
| for (Label label : target.getVisibility().getDependencyLabels()) { |
| Target visibilityTarget = getTarget(target, label, rootCauses); |
| if (visibilityTarget == null) { |
| continue; |
| } |
| if (!(visibilityTarget instanceof PackageGroup)) { |
| // Note that this error could also be caught in |
| // AbstractConfiguredTarget.convertVisibility(), but we have an |
| // opportunity here to avoid dependency cycles that result from |
| // the visibility attribute of a rule referring to a rule that |
| // depends on it (instead of its package) |
| invalidVisibilityReferenceHook(node, label); |
| continue; |
| } |
| |
| // Visibility always has null configuration |
| outgoingEdges.add(Dependency.withNullConfiguration(label)); |
| } |
| } |
| |
| /** |
| * Hook for the error case when an invalid visibility reference is found. |
| * |
| * @param node the node with the visibility attribute |
| * @param label the invalid visibility reference |
| */ |
| protected abstract void invalidVisibilityReferenceHook(TargetAndConfiguration node, Label label); |
| |
| /** |
| * 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); |
| |
| /** |
| * Hook for the error case where a dependency is missing. |
| * |
| * @param from the target referencing the missing target |
| * @param to the missing target |
| * @param e the exception that was thrown, e.g., by {@link #getTarget} |
| */ |
| protected abstract void missingEdgeHook(Target from, Label to, NoSuchThingException e); |
| |
| /** |
| * Returns the target by the given label. |
| * |
| * <p>Returns null if the target is not ready to be returned at this moment. If getTarget returns |
| * null once or more during a {@link #dependentNodeMap} call, the results of that call will be |
| * incomplete. For use within Skyframe, where several iterations may be needed to discover |
| * all dependencies. |
| */ |
| @Nullable |
| protected abstract Target getTarget(Target from, Label label, NestedSetBuilder<Label> rootCauses); |
| } |
