1 files changed, 138 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/skyframe/TargetCompletionFunction.java b/src/main/java/com/google/devtools/build/lib/skyframe/TargetCompletionFunction.java
new file mode 100644
index 0000000000..2e4aea9691
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/skyframe/TargetCompletionFunction.java
@@ -0,0 +1,138 @@
+// Copyright 2014 Google Inc. 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.lib.skyframe;
+
+import com.google.common.eventbus.EventBus;
+import com.google.devtools.build.lib.actions.ActionExecutionException;
+import com.google.devtools.build.lib.actions.Artifact;
+import com.google.devtools.build.lib.actions.MissingInputFileException;
+import com.google.devtools.build.lib.analysis.ConfiguredTarget;
+import com.google.devtools.build.lib.analysis.LabelAndConfiguration;
+import com.google.devtools.build.lib.analysis.TargetCompleteEvent;
+import com.google.devtools.build.lib.analysis.TopLevelArtifactContext;
+import com.google.devtools.build.lib.analysis.TopLevelArtifactHelper;
+import com.google.devtools.build.lib.collect.nestedset.NestedSet;
+import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
+import com.google.devtools.build.lib.events.Event;
+import com.google.devtools.build.lib.syntax.Label;
+import com.google.devtools.build.skyframe.SkyFunction;
+import com.google.devtools.build.skyframe.SkyFunctionException;
+import com.google.devtools.build.skyframe.SkyKey;
+import com.google.devtools.build.skyframe.SkyValue;
+import com.google.devtools.build.skyframe.ValueOrException2;
+
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicReference;
+
+import javax.annotation.Nullable;
+
+/**
+ * TargetCompletionFunction builds the artifactsToBuild collection of a {@link ConfiguredTarget}.
+ */
+public final class TargetCompletionFunction implements SkyFunction {
+
+  private final AtomicReference<EventBus> eventBusRef;
+
+  public TargetCompletionFunction(AtomicReference<EventBus> eventBusRef) {
+    this.eventBusRef = eventBusRef;
+  }
+
+  @Nullable
+  @Override
+  public SkyValue compute(SkyKey skyKey, Environment env) throws TargetCompletionFunctionException {
+    LabelAndConfiguration lac = (LabelAndConfiguration) skyKey.argument();
+    ConfiguredTargetValue ctValue = (ConfiguredTargetValue)
+        env.getValue(ConfiguredTargetValue.key(lac.getLabel(), lac.getConfiguration()));
+    TopLevelArtifactContext topLevelContext = PrecomputedValue.TOP_LEVEL_CONTEXT.get(env);
+    if (env.valuesMissing()) {
+      return null;
+    }
+
+    Map<SkyKey, ValueOrException2<MissingInputFileException, ActionExecutionException>> inputDeps =
+        env.getValuesOrThrow(ArtifactValue.mandatoryKeys(
+            TopLevelArtifactHelper.getAllArtifactsToBuild(
+                ctValue.getConfiguredTarget(), topLevelContext)),
+            MissingInputFileException.class, ActionExecutionException.class);
+
+    int missingCount = 0;
+    ActionExecutionException firstActionExecutionException = null;
+    MissingInputFileException missingInputException = null;
+    NestedSetBuilder<Label> rootCausesBuilder = NestedSetBuilder.stableOrder();
+    for (Map.Entry<SkyKey, ValueOrException2<MissingInputFileException,
+        ActionExecutionException>> depsEntry : inputDeps.entrySet()) {
+      Artifact input = ArtifactValue.artifact(depsEntry.getKey());
+      try {
+        depsEntry.getValue().get();
+      } catch (MissingInputFileException e) {
+        missingCount++;
+        if (input.getOwner() != null) {
+          rootCausesBuilder.add(input.getOwner());
+          env.getListener().handle(Event.error(
+              ctValue.getConfiguredTarget().getTarget().getLocation(),
+              String.format("%s: missing input file '%s'",
+                  lac.getLabel(), input.getOwner())));
+        }
+      } catch (ActionExecutionException e) {
+        rootCausesBuilder.addTransitive(e.getRootCauses());
+        if (firstActionExecutionException == null) {
+          firstActionExecutionException = e;
+        }
+      }
+    }
+
+    if (missingCount > 0) {
+      missingInputException = new MissingInputFileException(
+          ctValue.getConfiguredTarget().getTarget().getLocation() + " " + missingCount
+          + " input file(s) do not exist", ctValue.getConfiguredTarget().getTarget().getLocation());
+    }
+
+    NestedSet<Label> rootCauses = rootCausesBuilder.build();
+    if (!rootCauses.isEmpty()) {
+      eventBusRef.get().post(
+          TargetCompleteEvent.createFailed(ctValue.getConfiguredTarget(), rootCauses));
+      if (firstActionExecutionException != null) {
+        throw new TargetCompletionFunctionException(firstActionExecutionException);
+      } else {
+        throw new TargetCompletionFunctionException(missingInputException);
+      }
+    }
+
+    return env.valuesMissing() ? null : new TargetCompletionValue(ctValue.getConfiguredTarget());
+  }
+
+  @Override
+  public String extractTag(SkyKey skyKey) {
+    return Label.print(((LabelAndConfiguration) skyKey.argument()).getLabel());
+  }
+
+  private static final class TargetCompletionFunctionException extends SkyFunctionException {
+
+    private final ActionExecutionException actionException;
+
+    public TargetCompletionFunctionException(ActionExecutionException e) {
+      super(e, Transience.PERSISTENT);
+      this.actionException = e;
+    }
+
+    public TargetCompletionFunctionException(MissingInputFileException e) {
+      super(e, Transience.TRANSIENT);
+      this.actionException = null;
+    }
+
+    @Override
+    public boolean isCatastrophic() {
+      return actionException != null && actionException.isCatastrophe();
+    }
+  }
+}