/**
* Returns the host configuration trimmed to the same fragments as the input configuration. If the
* input is null, returns the top-level host configuration.
*
* <p>For static configurations, this unconditionally returns the (sole) top-level configuration.
*
* <p>This may only be called after {@link #setTopLevelHostConfiguration} has set the correct host
* configuration at the top-level.
*/
public BuildConfiguration getHostConfiguration(BuildConfiguration config) {
if (config == null || !config.useDynamicConfigurations()) {
return topLevelHostConfiguration;
}
// TODO(bazel-team): have the fragment classes be those required by the consuming target's
// transitive closure. This isn't the same as the input configuration's fragment classes -
// the latter may be a proper subset of the former.
//
// ConfigurationFactory.getConfiguration provides the reason why: if a declared required
// fragment is evaluated and returns null, it never gets added to the configuration. So if we
// use the configuration's fragments as the source of truth, that excludes required fragments
// that never made it in.
//
// If we're just trimming an existing configuration, this is no big deal (if the original
// configuration doesn't need the fragment, the trimmed one doesn't either). But this method
// trims a host configuration to the same scope as a target configuration. Since their options
// are different, the host instance may actually be able to produce the fragment. So it's
// wrong and potentially dangerous to unilaterally exclude it.
Set<Class<? extends BuildConfiguration.Fragment>> fragmentClasses = config.fragmentClasses();
BuildConfiguration hostConfig = hostConfigurationCache.get(fragmentClasses);
if (hostConfig != null) {
return hostConfig;
}
BuildConfiguration trimmedConfig =
topLevelHostConfiguration.clone(fragmentClasses, ruleClassProvider);
hostConfigurationCache.put(fragmentClasses, trimmedConfig);
return trimmedConfig;
}
private void visitRule(
Rule rule,
AspectDefinition aspect,
AspectParameters aspectParameters,
ListMultimap<Attribute, LabelAndConfiguration> labelMap,
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;
try {
toTarget = getTarget(label);
} catch (NoSuchThingException e) {
throw new IllegalStateException(
"not found: " + label + " from " + rule + " in " + attribute.getName());
}
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, aspectParameters, attribute, toTarget, rule))) {
outgoingEdges.put(entry.getKey(), dependency);
}
}
}
}
/**
* Returns the host configuration trimmed to the same fragments as the input configuration. If the
* input is null, returns the top-level host configuration.
*
* <p>For static configurations, this unconditionally returns the (sole) top-level configuration.
*
* <p>This may only be called after {@link #setTopLevelHostConfiguration} has set the correct host
* configuration at the top-level.
*/
public BuildConfiguration getHostConfiguration(BuildConfiguration config) {
if (config == null || !config.useDynamicConfigurations()) {
return topLevelHostConfiguration;
}
Set<Class<? extends BuildConfiguration.Fragment>> fragmentClasses = config.fragmentClasses();
BuildConfiguration hostConfig = hostConfigurationCache.get(fragmentClasses);
if (hostConfig != null) {
return hostConfig;
}
BuildConfiguration trimmedConfig =
topLevelHostConfiguration.clone(fragmentClasses, ruleClassProvider);
hostConfigurationCache.put(fragmentClasses, trimmedConfig);
return trimmedConfig;
}
@Override
@Nullable
public BuildConfiguration createConfigurations(
ConfigurationFactory configurationFactory,
Cache<String, BuildConfiguration> cache,
PackageProviderForConfigurations packageProvider,
BuildOptions buildOptions,
EventHandler eventHandler,
boolean performSanityCheck)
throws InvalidConfigurationException {
// Target configuration
BuildConfiguration targetConfiguration =
configurationFactory.getConfiguration(packageProvider, buildOptions, false, cache);
if (targetConfiguration == null) {
return null;
}
BuildConfiguration dataConfiguration = targetConfiguration;
// Host configuration
// Note that this passes in the dataConfiguration, not the target
// configuration. This is intentional.
BuildConfiguration hostConfiguration =
getHostConfigurationFromRequest(
configurationFactory, packageProvider, dataConfiguration, buildOptions, cache);
if (hostConfiguration == null) {
return null;
}
ListMultimap<SplitTransition<?>, BuildConfiguration> splitTransitionsTable =
ArrayListMultimap.create();
for (SplitTransition<BuildOptions> transition : buildOptions.getPotentialSplitTransitions()) {
List<BuildOptions> splitOptionsList = transition.split(buildOptions);
// While it'd be clearer to condition the below on "if (!splitOptionsList.empty())",
// IosExtension.ExtensionSplitArchTransition defaults to a single-value split. If we failed
// that case then no builds would work, whether or not they're iOS builds (since iOS
// configurations are unconditionally loaded). Once we have dynamic configuraiton support
// for split transitions, this will all go away.
if (splitOptionsList.size() > 1 && targetConfiguration.useDynamicConfigurations()) {
throw new InvalidConfigurationException(
"dynamic configurations don't yet support split transitions");
}
for (BuildOptions splitOptions : splitOptionsList) {
BuildConfiguration splitConfig =
configurationFactory.getConfiguration(packageProvider, splitOptions, false, cache);
splitTransitionsTable.put(transition, splitConfig);
}
}
if (packageProvider.valuesMissing()) {
return null;
}
// Sanity check that the implicit labels are all in the transitive closure of explicit ones.
// This also registers all targets in the cache entry and validates them on subsequent requests.
Set<Label> reachableLabels = new HashSet<>();
if (performSanityCheck) {
// We allow the package provider to be null for testing.
for (Map.Entry<String, Label> entry : buildOptions.getAllLabels().entries()) {
Label label = entry.getValue();
try {
collectTransitiveClosure(packageProvider, reachableLabels, label);
} catch (NoSuchThingException e) {
eventHandler.handle(Event.error(e.getMessage()));
throw new InvalidConfigurationException(
String.format("Failed to load required %s target: '%s'", entry.getKey(), label));
}
}
if (packageProvider.valuesMissing()) {
return null;
}
sanityCheckImplicitLabels(reachableLabels, targetConfiguration);
sanityCheckImplicitLabels(reachableLabels, hostConfiguration);
}
BuildConfiguration result =
setupTransitions(
targetConfiguration, dataConfiguration, hostConfiguration, splitTransitionsTable);
result.reportInvalidOptions(eventHandler);
return result;
}