Allow SkyValues to be marked not "comparable". Such values are not compared for the purpose of change pruning.
--
MOS_MIGRATED_REVID=108203369
diff --git a/src/main/java/com/google/devtools/build/skyframe/BuildingState.java b/src/main/java/com/google/devtools/build/skyframe/BuildingState.java
index 1f72484..d0d2573 100644
--- a/src/main/java/com/google/devtools/build/skyframe/BuildingState.java
+++ b/src/main/java/com/google/devtools/build/skyframe/BuildingState.java
@@ -300,6 +300,9 @@
*/
boolean unchangedFromLastBuild(SkyValue newValue) {
checkFinishedBuildingWhenAboutToSetValue();
+ if (newValue instanceof NotComparableSkyValue) {
+ return false;
+ }
return getLastBuildValue().equals(newValue) && lastBuildDirectDeps.equals(directDeps);
}
diff --git a/src/main/java/com/google/devtools/build/skyframe/NotComparableSkyValue.java b/src/main/java/com/google/devtools/build/skyframe/NotComparableSkyValue.java
new file mode 100644
index 0000000..5cb211b
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/skyframe/NotComparableSkyValue.java
@@ -0,0 +1,18 @@
+// Copyright 2015 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package com.google.devtools.build.skyframe;
+
+/** A SkyValue which, after a fresh evaluation, can never be equal to its last value. */
+public interface NotComparableSkyValue extends SkyValue {
+}
diff --git a/src/main/java/com/google/devtools/build/skyframe/ValueWithMetadata.java b/src/main/java/com/google/devtools/build/skyframe/ValueWithMetadata.java
index 6eab026..b702433 100644
--- a/src/main/java/com/google/devtools/build/skyframe/ValueWithMetadata.java
+++ b/src/main/java/com/google/devtools/build/skyframe/ValueWithMetadata.java
@@ -60,7 +60,7 @@
if (errorInfo == null) {
return transitiveEvents.isEmpty()
? value
- : new ValueWithEvents(value, transitiveEvents);
+ : ValueWithEvents.createValueWithEvents(value, transitiveEvents);
}
return new ErrorInfoValue(errorInfo, value, transitiveEvents);
}
@@ -75,15 +75,24 @@
public abstract NestedSet<TaggedEvents> getTransitiveEvents();
/** Implementation of {@link ValueWithMetadata} for the value case. */
- public static final class ValueWithEvents extends ValueWithMetadata {
+ public static class ValueWithEvents extends ValueWithMetadata {
private final NestedSet<TaggedEvents> transitiveEvents;
- public ValueWithEvents(SkyValue value, NestedSet<TaggedEvents> transitiveEvents) {
+ private ValueWithEvents(SkyValue value, NestedSet<TaggedEvents> transitiveEvents) {
super(Preconditions.checkNotNull(value));
this.transitiveEvents = Preconditions.checkNotNull(transitiveEvents);
}
+ public static ValueWithEvents createValueWithEvents(SkyValue value,
+ NestedSet<TaggedEvents> transitiveEvents) {
+ if (value instanceof NotComparableSkyValue) {
+ return new NotComparableValueWithEvents(value, transitiveEvents);
+ } else {
+ return new ValueWithEvents(value, transitiveEvents);
+ }
+ }
+
@Nullable
@Override
ErrorInfo getErrorInfo() { return null; }
@@ -124,8 +133,21 @@
public String toString() { return value.toString(); }
}
- /** Implementation of {@link ValueWithMetadata} for the error case. */
- private static final class ErrorInfoValue extends ValueWithMetadata {
+ private static final class NotComparableValueWithEvents extends ValueWithEvents
+ implements NotComparableSkyValue {
+ private NotComparableValueWithEvents(SkyValue value,
+ NestedSet<TaggedEvents> transitiveEvents) {
+ super(value, transitiveEvents);
+ }
+ }
+
+ /**
+ * Implementation of {@link ValueWithMetadata} for the error case.
+ *
+ * ErorInfo does not override equals(), so it may as well be marked NotComparableSkyValue.
+ */
+ private static final class ErrorInfoValue extends ValueWithMetadata
+ implements NotComparableSkyValue {
private final ErrorInfo errorInfo;
private final NestedSet<TaggedEvents> transitiveEvents;
@@ -198,7 +220,7 @@
if (value instanceof ValueWithMetadata) {
return (ValueWithMetadata) value;
}
- return new ValueWithEvents(value, NO_EVENTS);
+ return ValueWithEvents.createValueWithEvents(value, NO_EVENTS);
}
@Nullable
