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
|
// Copyright 2015 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.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.packages.AspectParameters;
import com.google.devtools.build.lib.rules.SkylarkRuleClassFunctions.SkylarkAspect;
import com.google.devtools.build.lib.skyframe.AspectValue.SkylarkAspectLoadingKey;
import com.google.devtools.build.lib.skyframe.SkylarkImportLookupFunction.SkylarkImportFailedException;
import com.google.devtools.build.lib.syntax.Type.ConversionException;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.build.skyframe.SkyFunction;
import com.google.devtools.build.skyframe.SkyFunctionException;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import javax.annotation.Nullable;
/**
* SkyFunction to load aspects from Skylark extensions and calculate their values.
*
* Used for loading top-level aspects. At top level, in
* {@link com.google.devtools.build.lib.analysis.BuildView}, we cannot invoke two SkyFunctions
* one after another, so BuildView calls this function to do the work.
*/
public class ToplevelSkylarkAspectFunction implements SkyFunction {
@Nullable
@Override
public SkyValue compute(SkyKey skyKey, Environment env)
throws LoadSkylarkAspectFunctionException, InterruptedException {
SkylarkAspectLoadingKey aspectLoadingKey = (SkylarkAspectLoadingKey) skyKey.argument();
String skylarkValueName = aspectLoadingKey.getSkylarkValueName();
PathFragment extensionFile = aspectLoadingKey.getExtensionFile();
// Find label corresponding to skylark file, if one exists.
ImmutableMap<PathFragment, Label> labelLookupMap;
try {
labelLookupMap =
SkylarkImportLookupFunction.labelsForAbsoluteImports(ImmutableSet.of(extensionFile), env);
} catch (SkylarkImportFailedException e) {
throw new LoadSkylarkAspectFunctionException(e, skyKey);
}
if (labelLookupMap == null) {
return null;
}
SkylarkAspect skylarkAspect = null;
try {
skylarkAspect = AspectFunction.loadSkylarkAspect(
env, labelLookupMap.get(extensionFile), skylarkValueName);
} catch (ConversionException e) {
throw new LoadSkylarkAspectFunctionException(e, skyKey);
}
if (skylarkAspect == null) {
return null;
}
SkyKey aspectKey =
AspectValue.key(
aspectLoadingKey.getTargetLabel(),
aspectLoadingKey.getTargetConfiguration(),
skylarkAspect.getAspectClass(),
AspectParameters.EMPTY);
return env.getValue(aspectKey);
}
@Nullable
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
/**
* Exceptions thrown from ToplevelSkylarkAspectFunction.
*/
public class LoadSkylarkAspectFunctionException extends SkyFunctionException {
public LoadSkylarkAspectFunctionException(Exception cause, SkyKey childKey) {
super(cause, childKey);
}
public LoadSkylarkAspectFunctionException(Exception cause) {
super(cause, Transience.PERSISTENT);
}
}
}
|
