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annotate truffle/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/verify/VerifyTruffleProcessor.java @ 22157:dc83cc1f94f2

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Using fully qualified imports
author Jaroslav Tulach <jaroslav.tulach@oracle.com>
date Wed, 16 Sep 2015 11:33:22 +0200
parents 9c8c0937da41
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2014, 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.verify;
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24
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25 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
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26 import com.oracle.truffle.api.nodes.Node.Child;
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27 import com.oracle.truffle.dsl.processor.ExpectError;
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28 import static com.oracle.truffle.dsl.processor.java.ElementUtils.getElementHierarchy;
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29 import java.io.PrintWriter;
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30 import java.io.StringWriter;
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31 import static java.util.Collections.reverse;
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32 import java.util.List;
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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.FilerException;
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36 import javax.annotation.processing.RoundEnvironment;
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37 import javax.annotation.processing.SupportedAnnotationTypes;
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38 import javax.lang.model.SourceVersion;
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39 import javax.lang.model.element.Element;
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40 import javax.lang.model.element.ElementKind;
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41 import javax.lang.model.element.ExecutableElement;
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42 import javax.lang.model.element.Modifier;
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43 import javax.lang.model.element.TypeElement;
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44 import javax.lang.model.element.VariableElement;
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45 import javax.tools.Diagnostic.Kind;
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46
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47 @SupportedAnnotationTypes({"com.oracle.truffle.api.CompilerDirectives.TruffleBoundary", "com.oracle.truffle.api.nodes.Node.Child"})
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48 public class VerifyTruffleProcessor extends AbstractProcessor {
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49 @Override
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50 public SourceVersion getSupportedSourceVersion() {
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51 return SourceVersion.latest();
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52 }
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53
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54 /**
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55 * Node class currently being processed.
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56 */
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57 private Element scope;
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58
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59 public static boolean isEnclosedIn(Element e, Element scopeElement) {
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60 List<Element> elementHierarchy = getElementHierarchy(e);
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61 return elementHierarchy.contains(scopeElement);
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62 }
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63
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64 void errorMessage(Element element, String format, Object... args) {
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65 message(Kind.ERROR, element, format, args);
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66 }
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67
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68 void message(Kind kind, Element element, String format, Object... args) {
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69 if (scope != null && !isEnclosedIn(element, scope)) {
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70 // See https://bugs.eclipse.org/bugs/show_bug.cgi?id=428357#c1
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71 List<Element> elementHierarchy = getElementHierarchy(element);
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72 reverse(elementHierarchy);
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73
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74 StringBuilder str = new StringBuilder();
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75 for (Element e : elementHierarchy) {
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76 if (e.getKind() != ElementKind.PACKAGE) {
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77 str.append(str.length() == 0 ? "" : ".");
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78 str.append(e);
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79 }
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80 }
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81 processingEnv.getMessager().printMessage(kind, String.format(str + ": " + format, args), scope);
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82 } else {
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83 processingEnv.getMessager().printMessage(kind, String.format(format, args), element);
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84 }
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85 }
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86
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87 /**
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88 * Bugs in an annotation processor can cause silent failure so try to report any exception
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89 * throws as errors.
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90 */
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91 private void reportException(Kind kind, Element element, Throwable t) {
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92 StringWriter buf = new StringWriter();
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93 t.printStackTrace(new PrintWriter(buf));
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94 buf.toString();
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95 message(kind, element, "Exception thrown during processing: %s", buf.toString());
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96 }
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97
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98 @Override
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99 public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
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100 if (roundEnv.processingOver()) {
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101 return false;
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102 }
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103
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104 TypeElement virtualFrameType = processingEnv.getElementUtils().getTypeElement("com.oracle.truffle.api.frame.VirtualFrame");
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105
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106 for (Element element : roundEnv.getElementsAnnotatedWith(TruffleBoundary.class)) {
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107 scope = element;
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108 try {
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109 ExecutableElement method = (ExecutableElement) element;
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110
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111 for (VariableElement parameter : method.getParameters()) {
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112 Element paramType = processingEnv.getTypeUtils().asElement(parameter.asType());
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113 if (paramType != null && paramType.equals(virtualFrameType)) {
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114 errorMessage(element, "Method %s cannot be annotated with @%s and have a parameter of type %s", method.getSimpleName(), TruffleBoundary.class.getSimpleName(),
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115 paramType.getSimpleName());
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116 }
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117 }
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118 } catch (Throwable t) {
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119 reportException(isBug367599(t) ? Kind.NOTE : Kind.ERROR, element, t);
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120 } finally {
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121 scope = null;
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122 }
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123 }
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124
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125 for (Element e : roundEnv.getElementsAnnotatedWith(Child.class)) {
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126 if (e.getModifiers().contains(Modifier.FINAL)) {
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127 emitError("@Child field cannot be final", e);
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128 continue;
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129 }
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130 assertNoErrorExpected(e);
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131 }
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132 return false;
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133 }
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134
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135 void assertNoErrorExpected(Element element) {
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136 ExpectError.assertNoErrorExpected(processingEnv, element);
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137 }
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138
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139 void emitError(String message, Element element) {
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140 if (ExpectError.isExpectedError(processingEnv, element, message)) {
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141 return;
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142 }
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143 processingEnv.getMessager().printMessage(Kind.ERROR, message, element);
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144 }
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145
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146 /**
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147 * Determines if a given exception is (most likely) caused by <a
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148 * href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=367599">Bug 367599</a>.
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149 */
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150 public static boolean isBug367599(Throwable t) {
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151 if (t instanceof FilerException) {
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152 for (StackTraceElement ste : t.getStackTrace()) {
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153 if (ste.toString().contains("org.eclipse.jdt.internal.apt.pluggable.core.filer.IdeFilerImpl.create")) {
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154 // See: https://bugs.eclipse.org/bugs/show_bug.cgi?id=367599
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155 return true;
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156 }
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157 }
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158 }
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159 if (t.getCause() != null) {
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160 return isBug367599(t.getCause());
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161 }
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162 return false;
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163 }
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164 }