diff options
Diffstat (limited to 'src/main/java/com/google/devtools/build/lib/skyframe/ToplevelSkylarkAspectFunction.java')
-rw-r--r-- | src/main/java/com/google/devtools/build/lib/skyframe/ToplevelSkylarkAspectFunction.java | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/skyframe/ToplevelSkylarkAspectFunction.java b/src/main/java/com/google/devtools/build/lib/skyframe/ToplevelSkylarkAspectFunction.java new file mode 100644 index 0000000000..fabb1bb058 --- /dev/null +++ b/src/main/java/com/google/devtools/build/lib/skyframe/ToplevelSkylarkAspectFunction.java @@ -0,0 +1,85 @@ +// 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.devtools.build.lib.cmdline.PackageIdentifier; +import com.google.devtools.build.lib.packages.AspectParameters; +import com.google.devtools.build.lib.rules.SkylarkRuleClassFunctions.SkylarkAspect; +import com.google.devtools.build.lib.rules.SkylarkRuleClassFunctions.SkylarkAspectClass; +import com.google.devtools.build.lib.skyframe.ASTFileLookupValue.ASTLookupInputException; +import com.google.devtools.build.lib.skyframe.AspectValue.SkylarkAspectLoadingKey; +import com.google.devtools.build.lib.syntax.Type.ConversionException; +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 aftre another, so BuildView call 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(); + PackageIdentifier extensionFile = aspectLoadingKey.getExtensionFile(); + SkylarkAspect skylarkAspect = null; + try { + skylarkAspect = AspectFunction.loadSkylarkAspect(env, extensionFile, skylarkValueName); + } catch (ASTLookupInputException | ConversionException e) { + throw new LoadSkylarkAspectFunctionException(e, skyKey); + } + if (skylarkAspect == null) { + return null; + } + SkyKey aspectKey = + AspectValue.key( + aspectLoadingKey.getTargetLabel(), + aspectLoadingKey.getTargetConfiguration(), + new SkylarkAspectClass(skylarkAspect), + 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); + } + } +} |