1 /*
   2  * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 
  25 package org.graalvm.compiler.replacements.processor;
  26 
  27 import java.util.ArrayList;
  28 import java.util.HashSet;
  29 import java.util.List;
  30 import java.util.Set;
  31 
  32 import javax.annotation.processing.RoundEnvironment;
  33 import javax.lang.model.SourceVersion;
  34 import javax.lang.model.element.AnnotationMirror;
  35 import javax.lang.model.element.Element;
  36 import javax.lang.model.element.TypeElement;
  37 import javax.tools.Diagnostic.Kind;
  38 
  39 import org.graalvm.compiler.processor.AbstractProcessor;
  40 
  41 /**
  42  * Processor for annotation types in the {@code org.graalvm.compiler.replacements} name space.
  43  */
  44 public class ReplacementsAnnotationProcessor extends AbstractProcessor {
  45 
  46     private List<AnnotationHandler> handlers;
  47 
  48     @Override
  49     public SourceVersion getSupportedSourceVersion() {
  50         return SourceVersion.latest();
  51     }
  52 
  53     @Override
  54     public boolean doProcess(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
  55         if (!roundEnv.processingOver()) {
  56             PluginGenerator generator = new PluginGenerator();
  57             for (AnnotationHandler handler : getHandlers()) {
  58                 TypeElement annotationClass = getTypeElementOrNull(handler.annotationTypeName);
  59                 if (annotationClass != null) {
  60                     for (Element e : roundEnv.getElementsAnnotatedWith(annotationClass)) {
  61                         AnnotationMirror annotationMirror = getAnnotation(e, annotationClass.asType());
  62                         handler.process(e, annotationMirror, generator);
  63                     }
  64                 } else {
  65                     Set<? extends Element> roots = roundEnv.getRootElements();
  66                     String message = String.format("Processor %s disabled as %s is not resolvable on the compilation class path", handler.getClass().getName(), handler.annotationTypeName);
  67                     if (roots.isEmpty()) {
  68                         env().getMessager().printMessage(Kind.WARNING, message);
  69                     } else {
  70                         env().getMessager().printMessage(Kind.WARNING, message, roots.iterator().next());
  71                     }
  72                 }
  73             }
  74             generator.generateAll(this);
  75         }
  76         return false;
  77     }
  78 
  79     public List<AnnotationHandler> getHandlers() {
  80         if (handlers == null) {
  81             handlers = new ArrayList<>();
  82             handlers.add(new ClassSubstitutionHandler(this));
  83             handlers.add(new MethodSubstitutionHandler(this));
  84             handlers.add(new NodeIntrinsicHandler(this));
  85             handlers.add(new FoldHandler(this));
  86         }
  87         return handlers;
  88     }
  89 
  90     @Override
  91     public Set<String> getSupportedAnnotationTypes() {
  92         Set<String> annotationTypes = new HashSet<>();
  93         for (AnnotationHandler handler : getHandlers()) {
  94             annotationTypes.add(handler.annotationTypeName);
  95         }
  96         return annotationTypes;
  97     }
  98 }