/* * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.truffle.dsl.processor; import java.io.IOException; import java.io.OutputStream; import java.util.ArrayList; import java.util.List; import java.util.Properties; import java.util.Set; import javax.annotation.processing.AbstractProcessor; import javax.annotation.processing.RoundEnvironment; import javax.annotation.processing.SupportedAnnotationTypes; import javax.lang.model.SourceVersion; import javax.lang.model.element.Element; import javax.lang.model.element.ElementKind; import javax.lang.model.element.ExecutableElement; import javax.lang.model.element.Modifier; import javax.lang.model.element.TypeElement; import javax.lang.model.type.TypeMirror; import javax.lang.model.util.ElementFilter; import javax.tools.Diagnostic.Kind; import javax.tools.FileObject; import javax.tools.StandardLocation; import com.oracle.truffle.api.TruffleLanguage; import com.oracle.truffle.api.TruffleLanguage.Registration; @SupportedAnnotationTypes("com.oracle.truffle.api.TruffleLanguage.Registration") public final class LanguageRegistrationProcessor extends AbstractProcessor { private final List<TypeElement> registrations = new ArrayList<>(); @Override public SourceVersion getSupportedSourceVersion() { return SourceVersion.latest(); } private void generateFile(List<TypeElement> languages) { String filename = "META-INF/truffle/language"; Properties p = new Properties(); int cnt = 0; for (TypeElement l : languages) { Registration annotation = l.getAnnotation(Registration.class); if (annotation == null) { continue; } String prefix = "language" + ++cnt + "."; String className = processingEnv.getElementUtils().getBinaryName(l).toString(); p.setProperty(prefix + "name", annotation.name()); p.setProperty(prefix + "version", annotation.version()); p.setProperty(prefix + "className", className); String[] mimes = annotation.mimeType(); for (int i = 0; i < mimes.length; i++) { p.setProperty(prefix + "mimeType." + i, mimes[i]); } p.setProperty(prefix + "interactive", Boolean.toString(annotation.interactive())); } if (cnt > 0) { try { FileObject file = processingEnv.getFiler().createResource(StandardLocation.CLASS_OUTPUT, "", filename, languages.toArray(new Element[0])); try (OutputStream os = file.openOutputStream()) { p.store(os, "Generated by " + LanguageRegistrationProcessor.class.getName()); } } catch (IOException e) { processingEnv.getMessager().printMessage(Kind.ERROR, e.getMessage(), languages.get(0)); } } } @Override public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) { if (roundEnv.processingOver()) { generateFile(registrations); registrations.clear(); return true; } for (Element e : roundEnv.getElementsAnnotatedWith(Registration.class)) { Registration annotation = e.getAnnotation(Registration.class); if (annotation != null && e.getKind() == ElementKind.CLASS) { if (!e.getModifiers().contains(Modifier.PUBLIC)) { emitError("Registered language class must be public", e); continue; } if (e.getEnclosingElement().getKind() != ElementKind.PACKAGE && !e.getModifiers().contains(Modifier.STATIC)) { emitError("Registered language inner-class must be static", e); continue; } TypeMirror truffleLang = processingEnv.getTypeUtils().erasure(processingEnv.getElementUtils().getTypeElement(TruffleLanguage.class.getName()).asType()); if (!processingEnv.getTypeUtils().isAssignable(e.asType(), truffleLang)) { emitError("Registered language class must subclass TruffleLanguage", e); continue; } boolean foundConstructor = false; for (ExecutableElement constructor : ElementFilter.constructorsIn(e.getEnclosedElements())) { if (!constructor.getModifiers().contains(Modifier.PUBLIC)) { continue; } if (!constructor.getParameters().isEmpty()) { continue; } foundConstructor = true; break; } Element singletonElement = null; for (Element mem : e.getEnclosedElements()) { if (!mem.getModifiers().contains(Modifier.PUBLIC)) { continue; } if (mem.getKind() != ElementKind.FIELD) { continue; } if (!mem.getModifiers().contains(Modifier.FINAL)) { continue; } if (!"INSTANCE".equals(mem.getSimpleName().toString())) { continue; } if (processingEnv.getTypeUtils().isAssignable(mem.asType(), truffleLang)) { singletonElement = mem; break; } } if (singletonElement != null) { emitWarning("Using a singleton field is deprecated. Please provide a public no-argument constructor instead.", singletonElement); } else { if (!foundConstructor) { emitError("A TruffleLanguage subclass must have a public no argument constructor.", e); } else { assertNoErrorExpected(e); } } registrations.add((TypeElement) e); } } return true; } void assertNoErrorExpected(Element e) { ExpectError.assertNoErrorExpected(processingEnv, e); } void emitError(String msg, Element e) { if (ExpectError.isExpectedError(processingEnv, e, msg)) { return; } processingEnv.getMessager().printMessage(Kind.ERROR, msg, e); } void emitWarning(String msg, Element e) { if (ExpectError.isExpectedError(processingEnv, e, msg)) { return; } processingEnv.getMessager().printMessage(Kind.WARNING, msg, e); } }