annotate graal/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/LanguageRegistrationProcessor.java @ 21481:bb51b9a142b3

Enforcing public, one parameter constructor for each TruffleLanguage by annotation processor and required call to super.
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Mon, 25 May 2015 12:26:53 +0200
parents 99942eac9c6d
children f5b49d881909 b1530a6cce8c
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1 /*
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2 * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.truffle.dsl.processor;
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24
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25 import com.oracle.truffle.api.TruffleLanguage;
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26 import com.oracle.truffle.api.TruffleLanguage.Registration;
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27 import com.oracle.truffle.api.dsl.ExpectError;
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28 import java.io.IOException;
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29 import java.io.OutputStream;
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30 import java.util.List;
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31 import java.util.Map;
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32 import java.util.Properties;
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33 import java.util.Set;
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34 import javax.annotation.processing.AbstractProcessor;
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35 import javax.annotation.processing.RoundEnvironment;
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36 import javax.annotation.processing.SupportedAnnotationTypes;
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37 import javax.lang.model.SourceVersion;
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38 import javax.lang.model.element.AnnotationMirror;
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39 import javax.lang.model.element.AnnotationValue;
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40 import javax.lang.model.element.Element;
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41 import javax.lang.model.element.ElementKind;
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42 import javax.lang.model.element.ExecutableElement;
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43 import javax.lang.model.element.Modifier;
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44 import javax.lang.model.element.TypeElement;
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45 import javax.lang.model.type.TypeMirror;
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46 import javax.tools.Diagnostic.Kind;
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47 import javax.tools.FileObject;
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48 import javax.tools.StandardLocation;
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49
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50 @SupportedAnnotationTypes("com.oracle.truffle.api.*")
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51 public final class LanguageRegistrationProcessor extends AbstractProcessor {
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52 @Override
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53 public SourceVersion getSupportedSourceVersion() {
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54 return SourceVersion.latest();
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55 }
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56
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57 private void createProviderFile(TypeElement language, Registration annotation) {
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58 String filename = "META-INF/truffle/language";
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59 try {
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60 FileObject file = processingEnv.getFiler().createResource(StandardLocation.CLASS_OUTPUT, "", filename, language);
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61 Properties p = new Properties();
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62 String className = processingEnv.getElementUtils().getBinaryName(language).toString();
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63 p.setProperty("name", annotation.name());
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64 p.setProperty("className", className);
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65 String[] mimes = annotation.mimeType();
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66 for (int i = 0; i < mimes.length; i++) {
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67 p.setProperty("mimeType." + i, mimes[i]);
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68 }
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69 try (OutputStream os = file.openOutputStream()) {
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70 p.store(os, "Generated by " + LanguageRegistrationProcessor.class.getName());
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71 }
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72 } catch (IOException e) {
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73 processingEnv.getMessager().printMessage(Kind.ERROR, e.getMessage(), language);
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74 }
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75 }
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76
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77 @Override
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78 public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
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79 for (Element e : roundEnv.getElementsAnnotatedWith(Registration.class)) {
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80 Registration annotation = e.getAnnotation(Registration.class);
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81 if (annotation != null && e.getKind() == ElementKind.CLASS) {
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82 if (!e.getModifiers().contains(Modifier.PUBLIC)) {
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83 emitError("Registered language class must be public", e);
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84 continue;
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85 }
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86 if (e.getEnclosingElement().getKind() != ElementKind.PACKAGE && !e.getModifiers().contains(Modifier.STATIC)) {
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87 emitError("Registered language inner-class must be static", e);
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88 continue;
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89 }
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90 TypeMirror truffleLang = processingEnv.getElementUtils().getTypeElement(TruffleLanguage.class.getName()).asType();
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91 if (!processingEnv.getTypeUtils().isAssignable(e.asType(), truffleLang)) {
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92 emitError("Registered language class must subclass TruffleLanguage", e);
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93 continue;
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94 }
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95 boolean found = false;
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96 for (Element mem : e.getEnclosedElements()) {
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97 if (mem.getKind() != ElementKind.CONSTRUCTOR) {
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98 continue;
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99 }
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100 ExecutableElement ee = (ExecutableElement) mem;
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101 if (ee.getParameters().size() != 1) {
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102 continue;
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103 }
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104 if (!ee.getModifiers().contains(Modifier.PUBLIC)) {
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105 continue;
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106 }
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107 TypeMirror env = processingEnv.getElementUtils().getTypeElement(TruffleLanguage.Env.class.getCanonicalName()).asType();
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108 if (processingEnv.getTypeUtils().isSameType(ee.getParameters().get(0).asType(), env)) {
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109 found = true;
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110 break;
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111 }
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112 }
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113 if (!found) {
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114 emitError("Language must have a public constructor accepting TruffleLanguage.Env as parameter", e);
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115 continue;
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116 }
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117 assertNoErrorExpected(e);
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118 createProviderFile((TypeElement) e, annotation);
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119 }
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120 }
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121
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122 return true;
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123 }
21481
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124
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125 void assertNoErrorExpected(Element e) {
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126 TypeElement eee = processingEnv.getElementUtils().getTypeElement(ExpectError.class.getName());
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127 for (AnnotationMirror am : e.getAnnotationMirrors()) {
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128 if (am.getAnnotationType().asElement().equals(eee)) {
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129 processingEnv.getMessager().printMessage(Kind.ERROR, "Expected an error, but none found!", e);
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130 }
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131 }
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132 }
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133
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134 void emitError(String msg, Element e) {
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135 TypeElement eee = processingEnv.getElementUtils().getTypeElement(ExpectError.class.getName());
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136 for (AnnotationMirror am : e.getAnnotationMirrors()) {
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137 if (am.getAnnotationType().asElement().equals(eee)) {
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138 Map<? extends ExecutableElement, ? extends AnnotationValue> vals = am.getElementValues();
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139 if (vals.size() == 1) {
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140 AnnotationValue av = vals.values().iterator().next();
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141 if (av.getValue() instanceof List) {
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142 List<?> arr = (List<?>) av.getValue();
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143 for (Object o : arr) {
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144 if (o instanceof AnnotationValue) {
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145 AnnotationValue ov = (AnnotationValue) o;
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146 if (msg.equals(ov.getValue())) {
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147 return;
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148 }
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149 }
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150 }
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151 }
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152 }
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153 }
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154 }
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155 processingEnv.getMessager().printMessage(Kind.ERROR, msg, e);
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156 }
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157 }