| // Copyright 2019 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.ImmutableMap; |
| import com.google.devtools.build.lib.actions.Artifact; |
| import com.google.devtools.build.lib.util.Fingerprint; |
| import com.google.devtools.build.lib.vfs.PathFragment; |
| import java.util.Map; |
| import javax.annotation.Nullable; |
| |
| /** Wrapper around a map of bitcode files for purposes of caching its fingerprint. */ |
| final class BitcodeFiles { |
| |
| private final ImmutableMap<PathFragment, Artifact> files; |
| @Nullable private volatile byte[] fingerprint = null; |
| |
| BitcodeFiles(Map<PathFragment, Artifact> files) { |
| this.files = ImmutableMap.copyOf(files); |
| } |
| |
| @Nullable |
| Artifact lookup(PathFragment path) { |
| return files.get(path); |
| } |
| |
| Iterable<Artifact> getFiles() { |
| return files.values(); |
| } |
| |
| void addToFingerprint(Fingerprint fp) { |
| if (fingerprint == null) { |
| synchronized (this) { |
| if (fingerprint == null) { |
| fingerprint = computeFingerprint(); |
| } |
| } |
| } |
| fp.addBytes(fingerprint); |
| } |
| |
| private byte[] computeFingerprint() { |
| Fingerprint fp = new Fingerprint(); |
| for (PathFragment path : files.keySet()) { |
| fp.addPath(path); |
| } |
| return fp.digestAndReset(); |
| } |
| } |