private Feature(CToolchain.Feature feature) throws InvalidConfigurationException {
this.name = feature.getName();
ImmutableList.Builder<FlagSet> builder = ImmutableList.builder();
for (CToolchain.FlagSet flagSet : feature.getFlagSetList()) {
builder.add(new FlagSet(flagSet));
}
this.flagSets = builder.build();
}
/**
* Constructs the feature configuration from a {@code CToolchain} protocol buffer.
*
* @param toolchain the toolchain configuration as specified by the user.
* @throws InvalidConfigurationException if the configuration has logical errors.
*/
CcToolchainFeatures(CToolchain toolchain) throws InvalidConfigurationException {
// Build up the feature graph.
// First, we build up the map of name -> features in one pass, so that earlier features can
// reference later features in their configuration.
ImmutableList.Builder<Feature> features = ImmutableList.builder();
HashMap<String, Feature> featuresByName = new HashMap<>();
for (CToolchain.Feature toolchainFeature : toolchain.getFeatureList()) {
Feature feature = new Feature(toolchainFeature);
features.add(feature);
if (featuresByName.put(feature.getName(), feature) != null) {
throw new InvalidConfigurationException(
"Invalid toolchain configuration: feature '"
+ feature.getName()
+ "' was specified multiple times.");
}
}
this.features = features.build();
this.featuresByName = ImmutableMap.copyOf(featuresByName);
// Next, we build up all forward references for 'implies' and 'requires' edges.
ImmutableMultimap.Builder<Feature, Feature> implies = ImmutableMultimap.builder();
ImmutableMultimap.Builder<Feature, ImmutableSet<Feature>> requires =
ImmutableMultimap.builder();
// We also store the reverse 'implied by' and 'required by' edges during this pass.
ImmutableMultimap.Builder<Feature, Feature> impliedBy = ImmutableMultimap.builder();
ImmutableMultimap.Builder<Feature, Feature> requiredBy = ImmutableMultimap.builder();
for (CToolchain.Feature toolchainFeature : toolchain.getFeatureList()) {
String name = toolchainFeature.getName();
Feature feature = featuresByName.get(name);
for (CToolchain.FeatureSet requiredFeatures : toolchainFeature.getRequiresList()) {
ImmutableSet.Builder<Feature> allOf = ImmutableSet.builder();
for (String requiredName : requiredFeatures.getFeatureList()) {
Feature required = getFeatureOrFail(requiredName, name);
allOf.add(required);
requiredBy.put(required, feature);
}
requires.put(feature, allOf.build());
}
for (String impliedName : toolchainFeature.getImpliesList()) {
Feature implied = getFeatureOrFail(impliedName, name);
impliedBy.put(implied, feature);
implies.put(feature, implied);
}
}
this.implies = implies.build();
this.requires = requires.build();
this.impliedBy = impliedBy.build();
this.requiredBy = requiredBy.build();
}