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// Copyright 2015 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.cpp;
import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.analysis.RuleConfiguredTarget.Mode;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.rules.cpp.LinkerInputs.LibraryToLink;
import com.google.devtools.build.lib.util.FileType;
/**
* A helper class that filters a given list of source files into different buckets - shared
* libraries, static libraries, pic object files, and non-pic object files.
*/
public final class PrecompiledFiles {
/** The Artifacts from srcs. */
private final ImmutableList<Artifact> files;
/**
* Initializes this object with the artifacts obtained from the "srcs" attribute of the given
* rule (this is the most common usage for this class).
*/
public PrecompiledFiles(RuleContext ruleContext) {
this.files = ruleContext.getPrerequisiteArtifacts("srcs", Mode.TARGET).list();
}
public Iterable<Artifact> getLibraries() {
return FileType.filter(files, CppFileTypes.ARCHIVE, CppFileTypes.PIC_ARCHIVE,
CppFileTypes.ALWAYS_LINK_LIBRARY, CppFileTypes.ALWAYS_LINK_PIC_LIBRARY,
CppFileTypes.SHARED_LIBRARY,
CppFileTypes.VERSIONED_SHARED_LIBRARY);
}
public Iterable<Artifact> getSharedLibraries() {
return getSharedLibrariesFrom(files);
}
static Iterable<Artifact> getSharedLibrariesFrom(Iterable<Artifact> collection) {
return FileType.filter(collection, CppFileTypes.SHARED_LIBRARY,
CppFileTypes.VERSIONED_SHARED_LIBRARY);
}
public Iterable<Artifact> getStaticLibraries() {
return FileType.filter(files, CppFileTypes.ARCHIVE, CppFileTypes.ALWAYS_LINK_LIBRARY);
}
public Iterable<LibraryToLink> getPicStaticLibraries() {
return LinkerInputs.opaqueLibrariesToLink(
FileType.filter(files, CppFileTypes.PIC_ARCHIVE,
CppFileTypes.ALWAYS_LINK_PIC_LIBRARY));
}
public Iterable<Artifact> getObjectFiles(final boolean usePic) {
if (usePic) {
return Iterables.filter(files, new Predicate<Artifact>() {
@Override
public boolean apply(Artifact artifact) {
String filename = artifact.getExecPathString();
// For compatibility with existing BUILD files, any ".o" files listed
// in srcs are assumed to be position-independent code, or
// at least suitable for inclusion in shared libraries, unless they
// end with ".nopic.o". (The ".nopic.o" extension is an undocumented
// feature to give users at least some control over this.) Note that
// some target platforms do not require shared library code to be PIC.
return CppFileTypes.PIC_OBJECT_FILE.matches(filename)
|| (CppFileTypes.OBJECT_FILE.matches(filename) && !filename.endsWith(".nopic.o"));
}
});
} else {
return FileType.filter(files, CppFileTypes.OBJECT_FILE);
}
}
}
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