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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.pkgcache;
import com.google.common.collect.Lists;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.cmdline.ResolvedTargets;
import com.google.devtools.build.lib.cmdline.TargetParsingException;
import com.google.devtools.build.lib.events.EventHandler;
import com.google.devtools.build.lib.packages.Attribute;
import com.google.devtools.build.lib.packages.BuildType;
import com.google.devtools.build.lib.packages.FileTarget;
import com.google.devtools.build.lib.packages.NoSuchThingException;
import com.google.devtools.build.lib.packages.Package;
import com.google.devtools.build.lib.packages.RawAttributeMapper;
import com.google.devtools.build.lib.packages.Rule;
import com.google.devtools.build.lib.packages.RuleClass;
import com.google.devtools.build.lib.packages.Target;
import com.google.devtools.build.lib.util.BinaryPredicate;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
/**
* Implementation of --compile_one_dependency.
*/
final class CompileOneDependencyTransformer {
private final PackageManager pkgManager;
public CompileOneDependencyTransformer(PackageManager pkgManager) {
this.pkgManager = pkgManager;
}
/**
* For each input file in the original result, returns a rule in the same package which has the
* input file as a source.
*/
public ResolvedTargets<Target> transformCompileOneDependency(EventHandler eventHandler,
ResolvedTargets<Target> original) throws TargetParsingException {
if (original.hasError()) {
return original;
}
ResolvedTargets.Builder<Target> builder = ResolvedTargets.builder();
for (Target target : original.getTargets()) {
builder.add(transformCompileOneDependency(eventHandler, target));
}
return builder.build();
}
/**
* Returns a list of rules in the given package sorted by BUILD file order. When
* multiple rules depend on a target, we choose the first match in this list (after
* filtering for preferred dependencies - see below).
*/
private Iterable<Rule> getOrderedRuleList(Package pkg) {
List<Rule> orderedList = Lists.newArrayList();
for (Rule rule : pkg.getTargets(Rule.class)) {
orderedList.add(rule);
}
Collections.sort(orderedList, new Comparator<Rule>() {
@Override
public int compare(Rule o1, Rule o2) {
return Integer.compare(
o1.getLocation().getStartOffset(),
o2.getLocation().getStartOffset());
}
});
return orderedList;
}
private Target transformCompileOneDependency(EventHandler eventHandler, Target target)
throws TargetParsingException {
if (!(target instanceof FileTarget)) {
throw new TargetParsingException("--compile_one_dependency target '" +
target.getLabel() + "' must be a file");
}
Package pkg = target.getPackage();
Iterable<Rule> orderedRuleList = getOrderedRuleList(pkg);
// Consuming rule to return if no "preferred" rules have been found.
Rule fallbackRule = null;
for (Rule rule : orderedRuleList) {
try {
// The call to getSrcTargets here can be removed in favor of the
// rule.getLabels() call below once we update "srcs" for all rules.
if (SrcTargetUtil.getSrcTargets(eventHandler, rule, pkgManager).contains(target)) {
if (rule.getRuleClassObject().isPreferredDependency(target.getName())) {
return rule;
} else if (fallbackRule == null) {
fallbackRule = rule;
}
}
} catch (NoSuchThingException e) {
// Nothing to see here. Move along.
} catch (InterruptedException e) {
throw new TargetParsingException("interrupted");
}
}
Rule result = null;
// For each rule, see if it has directCompileTimeInputAttribute,
// and if so check the targets listed in that attribute match the label.
final BinaryPredicate<Rule, Attribute> directCompileTimeInput =
new BinaryPredicate<Rule, Attribute>() {
@Override
public boolean apply(Rule rule, Attribute attribute) {
return Rule.DIRECT_COMPILE_TIME_INPUT.apply(rule, attribute)
// We don't know which path to follow for configurable attributes, so skip them.
&& !rule.isConfigurableAttribute(attribute.getName());
}
};
for (Rule rule : orderedRuleList) {
if (rule.getLabels(directCompileTimeInput).contains(target.getLabel())) {
if (rule.getRuleClassObject().isPreferredDependency(target.getName())) {
result = rule;
} else if (fallbackRule == null) {
fallbackRule = rule;
}
}
}
if (result == null) {
result = fallbackRule;
}
if (result == null) {
throw new TargetParsingException(
"Couldn't find dependency on target '" + target.getLabel() + "'");
}
try {
// If the rule has source targets, return it.
if (!SrcTargetUtil.getSrcTargets(eventHandler, result, pkgManager).isEmpty()) {
return result;
}
} catch (NoSuchThingException e) {
throw new TargetParsingException(
"Couldn't find dependency on target '" + target.getLabel() + "'");
} catch (InterruptedException e) {
throw new TargetParsingException("interrupted");
}
for (Rule rule : orderedRuleList) {
RawAttributeMapper attributes = RawAttributeMapper.of(rule);
// We don't know which path to follow for configurable attributes, so skip them.
if (attributes.isConfigurable("deps", BuildType.LABEL_LIST)
|| attributes.isConfigurable("srcs", BuildType.LABEL_LIST)) {
continue;
}
RuleClass ruleClass = rule.getRuleClassObject();
if (ruleClass.hasAttr("deps", BuildType.LABEL_LIST) &&
ruleClass.hasAttr("srcs", BuildType.LABEL_LIST)) {
for (Label dep : attributes.get("deps", BuildType.LABEL_LIST)) {
if (dep.equals(result.getLabel())) {
if (!attributes.get("srcs", BuildType.LABEL_LIST).isEmpty()) {
return rule;
}
}
}
}
}
throw new TargetParsingException(
"Couldn't find dependency on target '" + target.getLabel() + "'");
}
}
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