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

// Copyright 2018 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.lib.rules.cpp;

import com.google.devtools.build.lib.actions.MutableActionGraph.ActionConflictException;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder;
import com.google.devtools.build.lib.analysis.RuleConfiguredTargetFactory;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.Runfiles;
import com.google.devtools.build.lib.analysis.RunfilesProvider;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;

/** Implementation for the {@code fdo_prefetch_hints} rule. */
@Immutable
public final class FdoPrefetchHints implements RuleConfiguredTargetFactory {
  @Override
  public ConfiguredTarget create(RuleContext ruleContext)
      throws RuleErrorException, ActionConflictException {
    CcCommon.checkRuleLoadedThroughMacro(ruleContext);

    FdoInputFile inputFile = FdoInputFile.fromProfileRule(ruleContext);
    if (ruleContext.hasErrors()) {
      return null;
    }

    return new RuleConfiguredTargetBuilder(ruleContext)
        .addNativeDeclaredProvider(new FdoPrefetchHintsProvider(inputFile))
        .addProvider(RunfilesProvider.simple(Runfiles.EMPTY))
        .build();
  }
}