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Attempt #4 Adds FakeAutoCodecProcessor to bazel-distfile.
Change-Id: Ie8dd0aa0ed6234fc3fd2e337fd50f9f7d5c7d2c1 PiperOrigin-RevId: 179607524
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42 changes: 42 additions & 0 deletions
42
...in/java/com/google/devtools/build/lib/skyframe/serialization/autocodec/AutoCodecUtil.java
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| @@ -0,0 +1,42 @@ | ||
| // 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. | ||
|
|
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| package com.google.devtools.build.lib.skyframe.serialization.autocodec; | ||
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| import com.google.common.collect.ImmutableList; | ||
| import java.util.stream.Collectors; | ||
| import javax.lang.model.element.Element; | ||
| import javax.lang.model.element.TypeElement; | ||
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| /** Static utilities for AutoCodec processors. */ | ||
| class AutoCodecUtil { | ||
| // Synthesized classes will have `_AutoCodec` suffix added. | ||
| public static final String GENERATED_CLASS_NAME_SUFFIX = "AutoCodec"; | ||
| static final Class<AutoCodec> ANNOTATION = AutoCodec.class; | ||
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| /** | ||
| * Name of the generated codec class. | ||
| * | ||
| * <p>For {@code Foo.Bar} this is {@code Foo_Bar_AutoCodec}. | ||
| */ | ||
| static String getCodecName(Element element) { | ||
| ImmutableList.Builder<String> classNamesBuilder = new ImmutableList.Builder<>(); | ||
| classNamesBuilder.add(GENERATED_CLASS_NAME_SUFFIX); | ||
| do { | ||
| classNamesBuilder.add(element.getSimpleName().toString()); | ||
| element = element.getEnclosingElement(); | ||
| } while (element instanceof TypeElement); | ||
| return classNamesBuilder.build().reverse().stream().collect(Collectors.joining("_")); | ||
| } | ||
| } |
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114 changes: 114 additions & 0 deletions
114
...om/google/devtools/build/lib/skyframe/serialization/autocodec/FakeAutoCodecProcessor.java
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| Original file line number | Diff line number | Diff line change |
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| // 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. | ||
|
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| package com.google.devtools.build.lib.skyframe.serialization.autocodec; | ||
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| import com.google.auto.service.AutoService; | ||
| import com.google.common.collect.ImmutableSet; | ||
| import com.google.devtools.build.lib.skyframe.serialization.ObjectCodec; | ||
| import com.google.protobuf.CodedInputStream; | ||
| import com.google.protobuf.CodedOutputStream; | ||
| import com.squareup.javapoet.ClassName; | ||
| import com.squareup.javapoet.JavaFile; | ||
| import com.squareup.javapoet.MethodSpec; | ||
| import com.squareup.javapoet.ParameterizedTypeName; | ||
| import com.squareup.javapoet.TypeName; | ||
| import com.squareup.javapoet.TypeSpec; | ||
| import java.io.IOException; | ||
| import java.util.Set; | ||
| import javax.annotation.processing.AbstractProcessor; | ||
| import javax.annotation.processing.ProcessingEnvironment; | ||
| import javax.annotation.processing.Processor; | ||
| import javax.annotation.processing.RoundEnvironment; | ||
| import javax.lang.model.SourceVersion; | ||
| import javax.lang.model.element.Element; | ||
| import javax.lang.model.element.Modifier; | ||
| import javax.lang.model.element.TypeElement; | ||
| import javax.tools.Diagnostic; | ||
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| /** | ||
| * A fake annotation processor for bootstrapping. | ||
| * | ||
| * <p>When bootstrapping, annotation processors inside the Bazel source tree are not available which | ||
| * means that if there are dependencies on generated code, bootstrapping will fail. This processor | ||
| * generates stub code to pass the initial boostrapping phase. | ||
| */ | ||
| @AutoService(Processor.class) | ||
| public class FakeAutoCodecProcessor extends AbstractProcessor { | ||
| private ProcessingEnvironment env; // Captured from `init` method. | ||
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| @Override | ||
| public Set<String> getSupportedAnnotationTypes() { | ||
| return ImmutableSet.of(AutoCodecUtil.ANNOTATION.getCanonicalName()); | ||
| } | ||
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| @Override | ||
| public SourceVersion getSupportedSourceVersion() { | ||
| return SourceVersion.latestSupported(); // Supports all versions of Java. | ||
| } | ||
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| @Override | ||
| public synchronized void init(ProcessingEnvironment processingEnv) { | ||
| super.init(processingEnv); | ||
| this.env = processingEnv; | ||
| } | ||
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| @Override | ||
| public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) { | ||
| for (Element element : roundEnv.getElementsAnnotatedWith(AutoCodecUtil.ANNOTATION)) { | ||
| TypeElement encodedType = (TypeElement) element; | ||
| TypeSpec.Builder codecClassBuilder = | ||
| TypeSpec.classBuilder(AutoCodecUtil.getCodecName(encodedType)) | ||
| .addSuperinterface( | ||
| ParameterizedTypeName.get( | ||
| ClassName.get(ObjectCodec.class), TypeName.get(encodedType.asType()))); | ||
| codecClassBuilder.addMethod( | ||
| MethodSpec.methodBuilder("getEncodedClass") | ||
| .addModifiers(Modifier.PUBLIC) | ||
| .addAnnotation(Override.class) | ||
| .returns( | ||
| ParameterizedTypeName.get( | ||
| ClassName.get(Class.class), TypeName.get(encodedType.asType()))) | ||
| .addStatement("throw new RuntimeException(\"Shouldn't be called.\")") | ||
| .build()); | ||
| codecClassBuilder.addMethod( | ||
| MethodSpec.methodBuilder("serialize") | ||
| .addModifiers(Modifier.PUBLIC) | ||
| .addParameter(TypeName.get(encodedType.asType()), "input") | ||
| .addParameter(CodedOutputStream.class, "codedOut") | ||
| .addAnnotation(Override.class) | ||
| .addStatement("throw new RuntimeException(\"Shouldn't be called.\")") | ||
| .build()); | ||
| codecClassBuilder.addMethod( | ||
| MethodSpec.methodBuilder("deserialize") | ||
| .addModifiers(Modifier.PUBLIC) | ||
| .returns(TypeName.get(encodedType.asType())) | ||
| .addParameter(CodedInputStream.class, "codedIn") | ||
| .addAnnotation(Override.class) | ||
| .addStatement("throw new RuntimeException(\"Shouldn't be called.\")") | ||
| .build()); | ||
| String packageName = | ||
| env.getElementUtils().getPackageOf(encodedType).getQualifiedName().toString(); | ||
| try { | ||
| JavaFile file = JavaFile.builder(packageName, codecClassBuilder.build()).build(); | ||
| file.writeTo(env.getFiler()); | ||
| } catch (IOException e) { | ||
| env.getMessager() | ||
| .printMessage( | ||
| Diagnostic.Kind.ERROR, "Failed to generate output file: " + e.getMessage()); | ||
| } | ||
| } | ||
| return true; | ||
| } | ||
| } |