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// 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.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.analysis.Aspect;
import com.google.devtools.build.lib.analysis.ConfiguredAspectFactory;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.SkylarkProviderValidationUtil;
import com.google.devtools.build.lib.events.Location;
import com.google.devtools.build.lib.packages.AspectParameters;
import com.google.devtools.build.lib.rules.SkylarkRuleClassFunctions.SkylarkAspect;
import com.google.devtools.build.lib.rules.SkylarkRuleContext;
import com.google.devtools.build.lib.syntax.ClassObject.SkylarkClassObject;
import com.google.devtools.build.lib.syntax.Environment;
import com.google.devtools.build.lib.syntax.EvalException;
import com.google.devtools.build.lib.syntax.EvalExceptionWithStackTrace;
import com.google.devtools.build.lib.syntax.Mutability;
/**
* A factory for aspects that are defined in Skylark.
*/
public class SkylarkAspectFactory implements ConfiguredAspectFactory {
private final String name;
private final SkylarkAspect skylarkAspect;
public SkylarkAspectFactory(String name, SkylarkAspect skylarkAspect) {
this.name = name;
this.skylarkAspect = skylarkAspect;
}
@Override
public Aspect create(ConfiguredTarget base, RuleContext ruleContext, AspectParameters parameters)
throws InterruptedException {
try (Mutability mutability = Mutability.create("aspect")) {
SkylarkRuleContext skylarkRuleContext;
try {
skylarkRuleContext = new SkylarkRuleContext(ruleContext);
} catch (EvalException e) {
ruleContext.ruleError(e.getMessage());
return null;
}
Environment env =
Environment.builder(mutability)
.setSkylark()
.setGlobals(skylarkAspect.getFuncallEnv().getGlobals())
.setEventHandler(ruleContext.getAnalysisEnvironment().getEventHandler())
.build(); // NB: loading phase functions are not available: this is analysis already,
// so we do *not* setLoadingPhase().
Object aspectSkylarkObject;
try {
aspectSkylarkObject =
skylarkAspect
.getImplementation()
.call(
ImmutableList.<Object>of(base, skylarkRuleContext),
ImmutableMap.<String, Object>of(),
/*ast=*/ null,
env);
if (ruleContext.hasErrors()) {
return null;
} else if (!(aspectSkylarkObject instanceof SkylarkClassObject)) {
ruleContext.ruleError("Aspect implementation doesn't return a struct");
return null;
}
Aspect.Builder builder = new Aspect.Builder(name);
SkylarkClassObject struct = (SkylarkClassObject) aspectSkylarkObject;
Location loc = struct.getCreationLoc();
for (String key : struct.getKeys()) {
builder.addSkylarkTransitiveInfo(key, struct.getValue(key), loc);
}
Aspect aspect = builder.build();
SkylarkProviderValidationUtil.checkOrphanArtifacts(ruleContext);
return aspect;
} catch (EvalException e) {
addAspectToStackTrace(base, e);
ruleContext.ruleError("\n" + e.print());
return null;
}
}
}
private void addAspectToStackTrace(ConfiguredTarget base, EvalException e) {
if (e instanceof EvalExceptionWithStackTrace) {
((EvalExceptionWithStackTrace) e)
.registerPhantomFuncall(
String.format("%s(...)", name),
base.getTarget().getAssociatedRule().getLocation(),
skylarkAspect.getImplementation());
}
}
}
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