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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.rules.cpp;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.analysis.TransitiveInfoCollection;
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;
/**
* Provides generic functionality for collecting the .dwo artifacts produced by any target
* that compiles C++ files. Supports both transitive and "only direct outputs" collection.
* Provides accessors for both PIC and non-PIC compilation modes.
*/
public class DwoArtifactsCollector {
/**
* The .dwo files collected by this target in non-PIC compilation mode (i.e. myobject.dwo).
*/
private final NestedSet<Artifact> dwoArtifacts;
/**
* The .dwo files collected by this target in PIC compilation mode (i.e. myobject.pic.dwo).
*/
private final NestedSet<Artifact> picDwoArtifacts;
/** Instantiates a "real" collector on meaningful data. */
private DwoArtifactsCollector(
CcCompilationOutputs compilationOutputs,
Iterable<TransitiveInfoCollection> deps,
boolean generateDwo,
boolean ltoBackendArtifactsUsePic,
Iterable<LtoBackendArtifacts> ltoBackendArtifacts) {
Preconditions.checkNotNull(compilationOutputs);
Preconditions.checkNotNull(deps);
// Note: .dwo collection works fine with any order, but tests may assume a
// specific order for readability / simplicity purposes. See
// DebugInfoPackagingTest for details.
NestedSetBuilder<Artifact> dwoBuilder = NestedSetBuilder.compileOrder();
NestedSetBuilder<Artifact> picDwoBuilder = NestedSetBuilder.compileOrder();
dwoBuilder.addAll(compilationOutputs.getDwoFiles());
picDwoBuilder.addAll(compilationOutputs.getPicDwoFiles());
// If we are generating .dwo, add any generated for LtoBackendArtifacts.
if (generateDwo && ltoBackendArtifacts != null) {
for (LtoBackendArtifacts ltoBackendArtifact : ltoBackendArtifacts) {
Artifact dwoFile = ltoBackendArtifact.getDwoFile();
if (ltoBackendArtifactsUsePic) {
picDwoBuilder.add(dwoFile);
} else {
dwoBuilder.add(dwoFile);
}
}
}
for (TransitiveInfoCollection info : deps) {
CppDebugFileProvider provider = info.getProvider(CppDebugFileProvider.class);
if (provider != null) {
dwoBuilder.addTransitive(provider.getTransitiveDwoFiles());
picDwoBuilder.addTransitive(provider.getTransitivePicDwoFiles());
}
}
dwoArtifacts = dwoBuilder.build();
picDwoArtifacts = picDwoBuilder.build();
}
/**
* Instantiates an empty collector.
*/
private DwoArtifactsCollector() {
dwoArtifacts = NestedSetBuilder.<Artifact>emptySet(Order.COMPILE_ORDER);
picDwoArtifacts = NestedSetBuilder.<Artifact>emptySet(Order.COMPILE_ORDER);
}
/**
* Returns a new instance that collects direct outputs and transitive dependencies.
*
* @param compilationOutputs the {@code CcCompilationOutputs} for the owning target
* @param deps which of the target's transitive info collections should be visited
*/
public static DwoArtifactsCollector transitiveCollector(
CcCompilationOutputs compilationOutputs,
Iterable<TransitiveInfoCollection> deps,
boolean generateDwo,
boolean ltoBackendArtifactsUsePic,
Iterable<LtoBackendArtifacts> ltoBackendArtifacts) {
return new DwoArtifactsCollector(
compilationOutputs,
deps,
generateDwo,
ltoBackendArtifactsUsePic,
ltoBackendArtifacts);
}
/**
* Returns a new instance that collects direct outputs only.
*
* @param compilationOutputs the output {@code CcCompilationOutputs} for the owning target
*/
public static DwoArtifactsCollector directCollector(
CcCompilationOutputs compilationOutputs,
boolean generateDwo,
boolean ltoBackendArtifactsUsePic,
Iterable<LtoBackendArtifacts> ltoBackendArtifacts) {
return new DwoArtifactsCollector(
compilationOutputs,
ImmutableList.<TransitiveInfoCollection>of(),
generateDwo,
ltoBackendArtifactsUsePic,
ltoBackendArtifacts);
}
/**
* Returns a new instance that doesn't collect anything (its artifact sets are empty).
*/
public static DwoArtifactsCollector emptyCollector() {
return new DwoArtifactsCollector();
}
/**
* Returns the .dwo files applicable to non-PIC compilation mode (i.e. myobject.dwo).
*/
public NestedSet<Artifact> getDwoArtifacts() {
return dwoArtifacts;
}
/**
* Returns the .dwo files applicable to PIC compilation mode (i.e. myobject.pic.dwo).
*/
public NestedSet<Artifact> getPicDwoArtifacts() {
return picDwoArtifacts;
}
}
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