blob: b6329a7a3cf9b136e87739febffe3b23c61ba34e (
plain)
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
|
// 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.skyframe;
import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.cmdline.PackageIdentifier;
import com.google.devtools.build.lib.events.Event;
import com.google.devtools.build.lib.events.EventHandler;
import com.google.devtools.build.skyframe.CycleInfo;
import com.google.devtools.build.skyframe.CyclesReporter;
import com.google.devtools.build.skyframe.SkyKey;
/**
* Reports cycles of recursive import of Skylark files.
*/
public class SkylarkModuleCycleReporter implements CyclesReporter.SingleCycleReporter {
private static final Predicate<SkyKey> IS_SKYLARK_MODULE_SKY_KEY =
SkyFunctions.isSkyFunction(SkyFunctions.SKYLARK_IMPORTS_LOOKUP);
private static final Predicate<SkyKey> IS_PACKAGE_SKY_KEY =
SkyFunctions.isSkyFunction(SkyFunctions.PACKAGE);
@Override
public boolean maybeReportCycle(SkyKey topLevelKey, CycleInfo cycleInfo, boolean alreadyReported,
EventHandler eventHandler) {
ImmutableList<SkyKey> pathToCycle = cycleInfo.getPathToCycle();
if (pathToCycle.isEmpty()) {
return false;
}
SkyKey lastPathElement = cycleInfo.getPathToCycle().get(pathToCycle.size() - 1);
if (alreadyReported) {
return true;
} else if (Iterables.all(cycleInfo.getCycle(), IS_SKYLARK_MODULE_SKY_KEY)
// The last element of the path to the cycle has to be a PackageFunction.
&& IS_PACKAGE_SKY_KEY.apply(lastPathElement)) {
StringBuilder cycleMessage =
new StringBuilder()
.append(lastPathElement.argument()).append("/BUILD: ")
.append("cycle in referenced extension files: ");
AbstractLabelCycleReporter.printCycle(cycleInfo.getCycle(), cycleMessage,
new Function<SkyKey, String>() {
@Override
public String apply(SkyKey input) {
return ((PackageIdentifier) input.argument()).toString();
}
});
// TODO(bazel-team): it would be nice to pass the Location of the load Statement in the
// BUILD file.
eventHandler.handle(Event.error(null, cycleMessage.toString()));
return true;
}
return false;
}
}
|