Roll-foward of commit 351475627b9e94e5afdf472cbf465f49c433a25e which was rolled back in commit 1250fdac4c7769cfa200af8b4f9b061024356fea. There was nothing wrong with that change.

--
MOS_MIGRATED_REVID=119756383

2 files changed, 29 insertions, 23 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/analysis/RuleContext.java b/src/main/java/com/google/devtools/build/lib/analysis/RuleContext.java
index f77a271926..57e680824e 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/RuleContext.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/RuleContext.java
@@ -158,6 +158,7 @@ public final class RuleContext extends TargetContext
 
   private RuleContext(
       Builder builder,
+      AttributeMap attributes,
       ListMultimap<String, ConfiguredTarget> targetMap,
       ListMultimap<String, ConfiguredFilesetEntry> filesetEntryMap,
       Set<ConfigMatchingProvider> configConditions,
@@ -172,8 +173,7 @@ public final class RuleContext extends TargetContext
     this.targetMap = targetMap;
     this.filesetEntryMap = filesetEntryMap;
     this.configConditions = configConditions;
-    this.attributes =
-        ConfiguredAttributeMapper.of(builder.rule, configConditions);
+    this.attributes = attributes;
     this.features = getEnabledFeatures();
     this.ruleClassNameForLogging = ruleClassNameForLogging;
     this.aspectAttributes = aspectAttributes;
@@ -1330,11 +1330,14 @@ public final class RuleContext extends TargetContext
       Preconditions.checkNotNull(prerequisiteMap);
       Preconditions.checkNotNull(configConditions);
       Preconditions.checkNotNull(visibility);
+      AttributeMap attributes = ConfiguredAttributeMapper.of(rule, configConditions);
+      validateAttributes(attributes);
       ListMultimap<String, ConfiguredTarget> targetMap = createTargetMap();
       ListMultimap<String, ConfiguredFilesetEntry> filesetEntryMap =
           createFilesetEntryMap(rule, configConditions);
       return new RuleContext(
           this,
+          attributes,
           targetMap,
           filesetEntryMap,
           configConditions,
@@ -1343,6 +1346,10 @@ public final class RuleContext extends TargetContext
           aspectAttributes != null ? aspectAttributes : ImmutableMap.<String, Attribute>of());
     }
 
+    private void validateAttributes(AttributeMap attributes) {
+      rule.getRuleClassObject().checkAttributesNonEmpty(rule, reporter, attributes);
+    }
+
     Builder setVisibility(NestedSet<PackageSpecification> visibility) {
       this.visibility = visibility;
       return this;
diff --git a/src/main/java/com/google/devtools/build/lib/packages/RuleClass.java b/src/main/java/com/google/devtools/build/lib/packages/RuleClass.java
index 9accac3899..ed2ad3064c 100644
--- a/src/main/java/com/google/devtools/build/lib/packages/RuleClass.java
+++ b/src/main/java/com/google/devtools/build/lib/packages/RuleClass.java
@@ -1401,7 +1401,6 @@ public final class RuleClass {
       boolean explicit = attributeValues.isAttributeExplicitlySpecified(attributeName);
       setRuleAttributeValue(rule, eventHandler, attr, nativeAttributeValue, explicit);
       definedAttrIndices.set(attrIndex);
-      checkAttrValNonEmpty(rule, eventHandler, attributeValue, attr);
     }
     return definedAttrIndices;
   }
@@ -1457,7 +1456,6 @@ public final class RuleClass {
         attrsWithComputedDefaults.add(attr);
       } else {
         Object defaultValue = getAttributeNoncomputedDefaultValue(attr, pkgBuilder);
-        checkAttrValNonEmpty(rule, eventHandler, defaultValue, attr);
         rule.setAttributeValue(attr, defaultValue, /*explicit=*/ false);
         checkAllowedValues(rule, attr, eventHandler);
       }
@@ -1500,26 +1498,27 @@ public final class RuleClass {
         /*explicit=*/false);
   }
 
-  private void checkAttrValNonEmpty(
-      Rule rule, EventHandler eventHandler, Object attributeValue, Attribute attr) {
-    if (!attr.isNonEmpty()) {
-      return;
-    }
-
-    boolean isEmpty = false;
-
-    if (attributeValue instanceof SkylarkList) {
-      isEmpty = ((SkylarkList) attributeValue).isEmpty();
-    } else if (attributeValue instanceof List<?>) {
-      isEmpty = ((List<?>) attributeValue).isEmpty();
-    } else if (attributeValue instanceof Map<?, ?>) {
-      isEmpty = ((Map<?, ?>) attributeValue).isEmpty();
-    }
+  public void checkAttributesNonEmpty(
+      Rule rule, RuleErrorConsumer ruleErrorConsumer, AttributeMap attributes) {
+    for (String attributeName : attributes.getAttributeNames()) {
+      Attribute attr = attributes.getAttributeDefinition(attributeName);
+      if (!attr.isNonEmpty()) {
+        continue;
+      }
+      Object attributeValue = attributes.get(attributeName, attr.getType());
+
+      boolean isEmpty = false;
+      if (attributeValue instanceof SkylarkList) {
+        isEmpty = ((SkylarkList) attributeValue).isEmpty();
+      } else if (attributeValue instanceof List<?>) {
+        isEmpty = ((List<?>) attributeValue).isEmpty();
+      } else if (attributeValue instanceof Map<?, ?>) {
+        isEmpty = ((Map<?, ?>) attributeValue).isEmpty();
+      }
 
-    if (isEmpty) {
-      rule.reportError(rule.getLabel() + ": non empty attribute '" + attr.getName()
-          + "' in '" + name + "' rule '" + rule.getLabel() + "' has to have at least one value",
-          eventHandler);
+      if (isEmpty) {
+        ruleErrorConsumer.attributeError(attr.getName(), "attribute must be non empty");
+      }
     }
   }