1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
|
// Copyright 2017 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 static com.google.common.collect.ImmutableList.toImmutableList;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Streams;
import com.google.devtools.build.lib.actions.ActionExecutionContext;
import com.google.devtools.build.lib.actions.ActionKeyContext;
import com.google.devtools.build.lib.actions.ActionOwner;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.actions.Artifact.ArtifactExpander;
import com.google.devtools.build.lib.analysis.actions.AbstractFileWriteAction;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.util.Fingerprint;
import com.google.devtools.build.lib.vfs.PathFragment;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
/**
* Action for generating an umbrella header. All the headers are #included in the umbrella header.
*/
@Immutable
public final class UmbrellaHeaderAction extends AbstractFileWriteAction {
private static final String GUID = "62ea2952-bf28-92c3-efb1-e34621646910";
// NOTE: If you add a field here, you'll likely need to add it to the cache key in computeKey().
private final Artifact umbrellaHeader;
private final ImmutableList<Artifact> publicHeaders;
private final ImmutableList<PathFragment> additionalExportedHeaders;
public UmbrellaHeaderAction(
ActionOwner owner,
Artifact umbrellaHeader,
Iterable<Artifact> publicHeaders,
Iterable<PathFragment> additionalExportedHeaders) {
super(
owner,
Streams.stream(publicHeaders).filter(Artifact::isTreeArtifact).collect(toImmutableList()),
umbrellaHeader,
/*makeExecutable=*/ false);
this.umbrellaHeader = umbrellaHeader;
this.publicHeaders = ImmutableList.copyOf(publicHeaders);
this.additionalExportedHeaders = ImmutableList.copyOf(additionalExportedHeaders);
}
@Override
public DeterministicWriter newDeterministicWriter(ActionExecutionContext ctx) {
final ArtifactExpander artifactExpander = ctx.getArtifactExpander();
return new DeterministicWriter() {
@Override
public void writeOutputFile(OutputStream out) throws IOException {
StringBuilder content = new StringBuilder();
HashSet<PathFragment> deduper = new HashSet<>();
for (Artifact artifact : expandedHeaders(artifactExpander, publicHeaders)) {
appendHeader(content, artifact.getExecPath(), deduper);
}
for (PathFragment additionalExportedHeader : additionalExportedHeaders) {
appendHeader(content, additionalExportedHeader, deduper);
}
out.write(content.toString().getBytes(StandardCharsets.ISO_8859_1));
}
};
}
private static Iterable<Artifact> expandedHeaders(ArtifactExpander artifactExpander,
Iterable<Artifact> unexpandedHeaders) {
List<Artifact> expandedHeaders = new ArrayList<>();
for (Artifact unexpandedHeader : unexpandedHeaders) {
if (unexpandedHeader.isTreeArtifact()) {
artifactExpander.expand(unexpandedHeader, expandedHeaders);
} else {
expandedHeaders.add(unexpandedHeader);
}
}
return ImmutableList.copyOf(expandedHeaders);
}
private void appendHeader(StringBuilder content, PathFragment path,
HashSet<PathFragment> deduper) {
if (deduper.contains(path)) {
return;
}
deduper.add(path);
// #include headers. The #import directive is incompatible with J2ObjC segmented headers.
content.append("#include \"").append(path).append("\"");
content.append("\n");
}
@Override
public String getMnemonic() {
return "UmbrellaHeader";
}
@Override
protected void computeKey(ActionKeyContext actionKeyContext, Fingerprint fp) {
fp.addString(GUID);
fp.addPath(umbrellaHeader.getExecPath());
fp.addInt(publicHeaders.size());
for (Artifact artifact : publicHeaders) {
fp.addPath(artifact.getExecPath());
}
fp.addInt(additionalExportedHeaders.size());
for (PathFragment path : additionalExportedHeaders) {
fp.addPath(path);
}
}
}
|
