@Override
public List<Label> resolve(
Rule rule, AttributeMap attributes, BuildConfiguration configuration) {
// action_listeners are special rules; they tell the build system to add extra_actions to
// existing rules. As such they need an edge to every ConfiguredTarget with the limitation
// that they only run on the target configuration and should not operate on
// action_listeners
// and extra_actions themselves (to avoid cycles).
return configuration.getActionListeners();
}
/**
* Scans {@code action_listeners} associated with this build to see if any {@code extra_actions}
* should be added to this configured target. If any action_listeners are present, a partial visit
* of the artifact/action graph is performed (for as long as actions found are owned by this
* {@link ConfiguredTarget}). Any actions that match the {@code action_listener} get an {@code
* extra_action} associated. The output artifacts of the extra_action are reported to the {@link
* AnalysisEnvironment} for bookkeeping.
*/
private ExtraActionArtifactsProvider initializeExtraActions() {
BuildConfiguration configuration = ruleContext.getConfiguration();
if (configuration.isHostConfiguration()) {
return ExtraActionArtifactsProvider.EMPTY;
}
ImmutableList<Artifact> extraActionArtifacts = ImmutableList.of();
NestedSetBuilder<ExtraArtifactSet> builder = NestedSetBuilder.stableOrder();
List<Label> actionListenerLabels = configuration.getActionListeners();
if (!actionListenerLabels.isEmpty()
&& ruleContext.getRule().getAttributeDefinition(":action_listener") != null) {
ExtraActionsVisitor visitor =
new ExtraActionsVisitor(ruleContext, computeMnemonicsToExtraActionMap());
// The action list is modified within the body of the loop by the addExtraAction() call,
// thus the copy
for (Action action :
ImmutableList.copyOf(ruleContext.getAnalysisEnvironment().getRegisteredActions())) {
if (!actionsWithoutExtraAction.contains(action)) {
visitor.addExtraAction(action);
}
}
extraActionArtifacts = visitor.getAndResetExtraArtifacts();
if (!extraActionArtifacts.isEmpty()) {
builder.add(ExtraArtifactSet.of(ruleContext.getLabel(), extraActionArtifacts));
}
}
// Add extra action artifacts from dependencies
for (TransitiveInfoCollection dep : ruleContext.getConfiguredTargetMap().values()) {
ExtraActionArtifactsProvider provider = dep.getProvider(ExtraActionArtifactsProvider.class);
if (provider != null) {
builder.addTransitive(provider.getTransitiveExtraActionArtifacts());
}
}
if (mandatoryStampFiles != null && !mandatoryStampFiles.isEmpty()) {
builder.add(ExtraArtifactSet.of(ruleContext.getLabel(), mandatoryStampFiles));
}
if (extraActionArtifacts.isEmpty() && builder.isEmpty()) {
return ExtraActionArtifactsProvider.EMPTY;
}
return new ExtraActionArtifactsProvider(extraActionArtifacts, builder.build());
}