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// 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.rules.test;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.common.eventbus.EventBus;
import com.google.devtools.build.lib.actions.ActionOwner;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.actions.Executor;
import com.google.devtools.build.lib.actions.NotifyOnActionCacheHit;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.actions.AbstractFileWriteAction;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
import com.google.devtools.build.lib.collect.nestedset.Order;
import com.google.devtools.build.lib.events.EventHandler;
import com.google.devtools.build.lib.util.Fingerprint;
import com.google.devtools.build.lib.vfs.PathFragment;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
/**
* Generates baseline (empty) coverage for the given non-test target.
*/
@VisibleForTesting
public final class BaselineCoverageAction extends AbstractFileWriteAction
implements NotifyOnActionCacheHit {
private final Iterable<Artifact> instrumentedFiles;
private BaselineCoverageAction(
ActionOwner owner, Iterable<Artifact> instrumentedFiles, Artifact output) {
super(owner, ImmutableList.<Artifact>of(), output, false);
this.instrumentedFiles = instrumentedFiles;
}
@Override
public String getMnemonic() {
return "BaselineCoverage";
}
@Override
public String computeKey() {
return new Fingerprint()
.addStrings(getInstrumentedFilePathStrings())
.hexDigestAndReset();
}
private Iterable<String> getInstrumentedFilePathStrings() {
List<String> result = new ArrayList<>();
for (Artifact instrumentedFile : instrumentedFiles) {
result.add(instrumentedFile.getExecPathString());
}
return result;
}
@Override
public DeterministicWriter newDeterministicWriter(EventHandler eventHandler,
Executor executor) {
return new DeterministicWriter() {
@Override
public void writeOutputFile(OutputStream out) throws IOException {
PrintWriter writer = new PrintWriter(out);
for (String execPath : getInstrumentedFilePathStrings()) {
writer.write("SF:" + execPath + "\n");
writer.write("end_of_record\n");
}
writer.flush();
}
};
}
@Override
protected void afterWrite(Executor executor) {
notifyAboutBaselineCoverage(executor.getEventBus());
}
@Override
public void actionCacheHit(Executor executor) {
notifyAboutBaselineCoverage(executor.getEventBus());
}
/**
* Notify interested parties about new baseline coverage data.
*/
private void notifyAboutBaselineCoverage(EventBus eventBus) {
Artifact output = Iterables.getOnlyElement(getOutputs());
String ownerString = Label.print(getOwner().getLabel());
eventBus.post(new BaselineCoverageResult(output, ownerString));
}
/**
* Returns collection of baseline coverage artifacts associated with the given target.
* Will always return 0 or 1 elements.
*/
static NestedSet<Artifact> create(RuleContext ruleContext, Iterable<Artifact> instrumentedFiles) {
// Baseline coverage artifacts will still go into "testlogs" directory.
Artifact coverageData = ruleContext.getPackageRelativeArtifact(
new PathFragment(ruleContext.getTarget().getName()).getChild("baseline_coverage.dat"),
ruleContext.getConfiguration().getTestLogsDirectory());
ruleContext.registerAction(new BaselineCoverageAction(
ruleContext.getActionOwner(), instrumentedFiles, coverageData));
return NestedSetBuilder.create(Order.STABLE_ORDER, coverageData);
}
}
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