blob: 8d1df1f8ea55307e123d10175e6c602fad5e3a72 [file] [log] [blame]
// 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.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.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.RuleTransitionFactory;
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 NonAttributeDependencyKind() {}
@Override
public Attribute getAttribute() {
return null;
}
@Nullable
@Override
public AspectClass getOwningAspect() {
throw new IllegalStateException();
}
}
/** A dependency for visibility. */
public static final DependencyKind VISIBILITY_DEPENDENCY = new NonAttributeDependencyKind();
/** The dependency on the rule that creates a given output file. */
public static final DependencyKind OUTPUT_FILE_RULE_DEPENDENCY = new NonAttributeDependencyKind();
/** A dependency on a resolved toolchain. */
public static final DependencyKind TOOLCHAIN_DEPENDENCY = new NonAttributeDependencyKind();
/** 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 toolchainLabels required toolchain labels
* @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,
ImmutableSet<Label> toolchainLabels,
@Nullable RuleTransitionFactory 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,
toolchainLabels,
rootCauses,
trimmingTransitionFactory);
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.
*
* <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 toolchainLabels required toolchain labels
* @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,
ImmutableSet<Label> toolchainLabels,
NestedSetBuilder<Cause> rootCauses,
@Nullable RuleTransitionFactory trimmingTransitionFactory)
throws EvalException, InterruptedException, InconsistentAspectOrderException {
Target target = node.getTarget();
BuildConfiguration config = node.getConfiguration();
OrderedSetMultimap<DependencyKind, Label> outgoingLabels = OrderedSetMultimap.create();
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) {
visitRule(node, hostConfig, aspects, configConditions, toolchainLabels, outgoingLabels);
} else if (target instanceof PackageGroup) {
outgoingLabels.putAll(VISIBILITY_DEPENDENCY, ((PackageGroup) target).getIncludes());
} else {
throw new IllegalStateException(target.getLabel().toString());
}
Rule fromRule = target instanceof Rule ? (Rule) target : null;
ConfiguredAttributeMapper attributeMap =
fromRule == null ? null : ConfiguredAttributeMapper.of(fromRule, configConditions);
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, 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,
Rule fromRule,
ConfiguredAttributeMapper attributeMap,
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);
ConfigurationTransition attributeTransition =
attribute.hasSplitConfigurationTransition()
? attribute.getSplitTransition(attributeMap)
: attribute.getConfigurationTransition();
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 RuleTransitionFactory 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. Toolchain dependencies always have toTarget == null
// since we do not depend on their package.
continue;
}
ConfigurationTransition transition =
TransitionResolver.evaluateTransition(
originalConfiguration, dep.getTransition(), toTarget, trimmingTransitionFactory);
AspectCollection requiredAspects =
filterPropagatingAspects(dep.getPropagatingAspects(), toTarget);
outgoingEdges.put(
entry.getKey(),
transition == NullTransition.INSTANCE
? Dependency.withNullConfiguration(dep.getLabel())
: Dependency.withTransitionAndAspects(dep.getLabel(), transition, requiredAspects));
}
return outgoingEdges;
}
private void visitRule(
TargetAndConfiguration node,
BuildConfiguration hostConfig,
Iterable<Aspect> aspects,
ImmutableMap<Label, ConfigMatchingProvider> configConditions,
ImmutableSet<Label> toolchainLabels,
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();
ConfiguredAttributeMapper attributeMap = ConfiguredAttributeMapper.of(rule, configConditions);
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());
}
outgoingLabels.putAll(TOOLCHAIN_DEPENDENCY, toolchainLabels);
}
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)) {
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.hasSplitConfigurationTransition());
@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 set of advertised
* providers of the dependency.
*/
private AspectCollection filterPropagatingAspects(Iterable<Aspect> aspects, Target toTarget)
throws InconsistentAspectOrderException {
if (!(toTarget instanceof Rule)) {
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;
}
}
}