| // 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.collect.Iterables; |
| import com.google.devtools.build.lib.collect.nestedset.Depset; |
| 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.concurrent.ThreadSafety.Immutable; |
| import com.google.devtools.build.lib.packages.BuiltinProvider; |
| import com.google.devtools.build.lib.packages.NativeInfo; |
| import com.google.devtools.build.lib.starlarkbuildapi.cpp.CcNativeLibraryInfoApi; |
| import java.util.List; |
| import net.starlark.java.eval.EvalException; |
| |
| /** |
| * A target that provides native libraries in the transitive closure of its deps that are needed for |
| * executing C++ code. |
| */ |
| @Immutable |
| public final class CcNativeLibraryInfo extends NativeInfo implements CcNativeLibraryInfoApi { |
| |
| public static final CcNativeLibraryInfo EMPTY = |
| new CcNativeLibraryInfo(NestedSetBuilder.emptySet(Order.LINK_ORDER)); |
| |
| private final NestedSet<LibraryToLink> transitiveCcNativeLibraries; |
| |
| public static final Provider PROVIDER = new Provider(); |
| |
| public CcNativeLibraryInfo(NestedSet<LibraryToLink> transitiveCcNativeLibraries) { |
| this.transitiveCcNativeLibraries = transitiveCcNativeLibraries; |
| } |
| |
| @Override |
| public Provider getProvider() { |
| return PROVIDER; |
| } |
| |
| /** |
| * Collects native libraries in the transitive closure of its deps that are needed for executing |
| * C/C++ code. |
| * |
| * <p>In effect, returns all dynamic library (.so) artifacts provided by the transitive closure. |
| */ |
| public NestedSet<LibraryToLink> getTransitiveCcNativeLibraries() { |
| return transitiveCcNativeLibraries; |
| } |
| |
| /** Merge several CcNativeLibraryInfo objects into one. */ |
| public static CcNativeLibraryInfo merge(List<CcNativeLibraryInfo> providers) { |
| if (providers.isEmpty()) { |
| return EMPTY; |
| } else if (providers.size() == 1) { |
| return Iterables.getOnlyElement(providers); |
| } |
| |
| NestedSetBuilder<LibraryToLink> transitiveCcNativeLibraries = NestedSetBuilder.linkOrder(); |
| for (CcNativeLibraryInfo provider : providers) { |
| transitiveCcNativeLibraries.addTransitive(provider.getTransitiveCcNativeLibraries()); |
| } |
| return new CcNativeLibraryInfo(transitiveCcNativeLibraries.build()); |
| } |
| |
| /** Provider class for {@link CcNativeLibraryInfo} objects */ |
| public static class Provider extends BuiltinProvider<CcNativeLibraryInfo> |
| implements CcNativeLibraryInfoApi.Provider { |
| private Provider() { |
| super(CcNativeLibraryInfoApi.NAME, CcNativeLibraryInfo.class); |
| } |
| |
| @Override |
| public CcNativeLibraryInfo createCcNativeLibraryInfo(Object librariesToLinkObject) |
| throws EvalException { |
| return new CcNativeLibraryInfo( |
| Depset.cast(librariesToLinkObject, LibraryToLink.class, "libraries_to_link")); |
| } |
| } |
| } |