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.
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) {
builder.put(attribute, LabelAndConfiguration.of(label, configuration));
}
} else if (attribute.getType() == BuildType.LABEL_LIST) {
List<Label> labelList =
mappedAttributes.contains(attribute.getName())
? attributeMap.get(attribute.getName(), BuildType.LABEL_LIST)
: BuildType.LABEL_LIST.cast(attribute.getDefaultValue(rule));
for (Label label : labelList) {
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, actualConfig);
if (EvalUtils.isNullOrNone(actualValue)) {
continue;
}
try {
if (attribute.getType() == BuildType.LABEL) {
Label label = 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(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) {
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)));
}
}
}
}