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// Copyright 2014 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.skyframe;
import com.google.devtools.build.lib.analysis.DependencyResolver;
import com.google.devtools.build.lib.analysis.TargetAndConfiguration;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
import com.google.devtools.build.lib.events.Event;
import com.google.devtools.build.lib.packages.BuildFileContainsErrorsException;
import com.google.devtools.build.lib.packages.NoSuchPackageException;
import com.google.devtools.build.lib.packages.NoSuchTargetException;
import com.google.devtools.build.lib.packages.NoSuchThingException;
import com.google.devtools.build.lib.packages.Package;
import com.google.devtools.build.lib.packages.Target;
import com.google.devtools.build.lib.packages.TargetUtils;
import com.google.devtools.build.skyframe.SkyFunction.Environment;
import com.google.devtools.build.skyframe.SkyKey;
import javax.annotation.Nullable;
/**
* A dependency resolver for use within Skyframe. Loads packages lazily when possible.
*/
public final class SkyframeDependencyResolver extends DependencyResolver {
private final Environment env;
public SkyframeDependencyResolver(Environment env) {
this.env = env;
}
@Override
protected void invalidVisibilityReferenceHook(TargetAndConfiguration value, Label label) {
env.getListener().handle(
Event.error(TargetUtils.getLocationMaybe(value.getTarget()), String.format(
"Label '%s' in visibility attribute does not refer to a package group", label)));
}
@Override
protected void invalidPackageGroupReferenceHook(TargetAndConfiguration value, Label label) {
env.getListener().handle(
Event.error(TargetUtils.getLocationMaybe(value.getTarget()), String.format(
"label '%s' does not refer to a package group", label)));
}
@Override
protected void missingEdgeHook(Target from, Label to, NoSuchThingException e) {
if (e instanceof NoSuchTargetException) {
NoSuchTargetException nste = (NoSuchTargetException) e;
if (to.equals(nste.getLabel())) {
env.getListener().handle(
Event.error(
TargetUtils.getLocationMaybe(from),
TargetUtils.formatMissingEdge(from, to, e)));
}
} else if (e instanceof NoSuchPackageException) {
NoSuchPackageException nspe = (NoSuchPackageException) e;
if (nspe.getPackageId().equals(to.getPackageIdentifier())) {
env.getListener().handle(
Event.error(
TargetUtils.getLocationMaybe(from),
TargetUtils.formatMissingEdge(from, to, e)));
}
}
}
@Nullable
@Override
protected Target getTarget(Target from, Label label, NestedSetBuilder<Label> rootCauses) {
SkyKey key = PackageValue.key(label.getPackageIdentifier());
PackageValue packageValue;
try {
packageValue = (PackageValue) env.getValueOrThrow(key, NoSuchPackageException.class);
} catch (NoSuchPackageException e) {
rootCauses.add(label);
missingEdgeHook(from, label, e);
return null;
}
if (packageValue == null) {
return null;
}
Package pkg = packageValue.getPackage();
try {
Target target = pkg.getTarget(label.getName());
if (pkg.containsErrors()) {
NoSuchPackageException e =
new BuildFileContainsErrorsException(label.getPackageIdentifier());
missingEdgeHook(from, label, e);
if (target != null) {
rootCauses.add(label);
return target;
} else {
return null;
}
}
return target;
} catch (NoSuchTargetException e) {
rootCauses.add(label);
missingEdgeHook(from, label, e);
return null;
}
}
}
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