Make CppLinkAction implement Action.execute() instead of beginExecuti…

…on().

Another step towards removing the continuation-based action execution machinery.

RELNOTES: None.
PiperOrigin-RevId: 490458651
Change-Id: I9133033da1fc529da6375fbe6eded77900884c80

src/main/java/com/google/devtools/build/lib/rules/cpp/CppLinkAction.java

@@ -22,9 +22,7 @@
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Maps;
-import com.google.common.util.concurrent.ListenableFuture;
 import com.google.devtools.build.lib.actions.AbstractAction;
-import com.google.devtools.build.lib.actions.ActionContinuationOrResult;
 import com.google.devtools.build.lib.actions.ActionEnvironment;
 import com.google.devtools.build.lib.actions.ActionExecutionContext;
 import com.google.devtools.build.lib.actions.ActionExecutionException;
@@ -275,15 +273,22 @@ public ImmutableCollection<Artifact> getLinkstampObjectFileInputs() {
   }
 
   @Override
-  @ThreadCompatible
-  public ActionContinuationOrResult beginExecution(ActionExecutionContext actionExecutionContext)
+  public ActionResult execute(ActionExecutionContext actionExecutionContext)
       throws ActionExecutionException, InterruptedException {
     Spawn spawn = createSpawn(actionExecutionContext);
-    SpawnContinuation spawnContinuation =
+    SpawnContinuation continuation =
         actionExecutionContext
             .getContext(SpawnStrategyResolver.class)
             .beginExecution(spawn, actionExecutionContext);
-    return new CppLinkActionContinuation(actionExecutionContext, spawnContinuation);
+
+    try {
+      while (!continuation.isDone()) {
+        continuation = continuation.execute();
+      }
+      return ActionResult.create(continuation.get());
+    } catch (ExecException e) {
+      throw ActionExecutionException.fromExecException(e, CppLinkAction.this);
+    }
   }
 
   private Spawn createSpawn(ActionExecutionContext actionExecutionContext)
@@ -428,36 +433,6 @@ public ResourceSet estimateResourceConsumptionLocal(OS os, int inputs) {
     }
   }
 
-  private final class CppLinkActionContinuation extends ActionContinuationOrResult {
-    private final ActionExecutionContext actionExecutionContext;
-    private final SpawnContinuation spawnContinuation;
-
-    public CppLinkActionContinuation(
-        ActionExecutionContext actionExecutionContext, SpawnContinuation spawnContinuation) {
-      this.actionExecutionContext = actionExecutionContext;
-      this.spawnContinuation = spawnContinuation;
-    }
-
-    @Override
-    public ListenableFuture<?> getFuture() {
-      return spawnContinuation.getFuture();
-    }
-
-    @Override
-    public ActionContinuationOrResult execute()
-        throws ActionExecutionException, InterruptedException {
-      try {
-        SpawnContinuation nextContinuation = spawnContinuation.execute();
-        if (!nextContinuation.isDone()) {
-          return new CppLinkActionContinuation(actionExecutionContext, nextContinuation);
-        }
-        return ActionContinuationOrResult.of(ActionResult.create(nextContinuation.get()));
-      } catch (ExecException e) {
-        throw ActionExecutionException.fromExecException(e, CppLinkAction.this);
-      }
-    }
-  }
-
   @Override
   public Sequence<String> getStarlarkArgv() throws EvalException {
     try {