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annotate truffle/com.oracle.truffle.dsl.processor/src/com/oracle/truffle/dsl/processor/parser/MethodSpecParser.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
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1 /*
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2 * Copyright (c) 2012, 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.parser;
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24
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25 import com.oracle.truffle.dsl.processor.java.ElementUtils;
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26 import static com.oracle.truffle.dsl.processor.java.ElementUtils.hasError;
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27 import com.oracle.truffle.dsl.processor.java.model.CodeVariableElement;
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28 import com.oracle.truffle.dsl.processor.model.MethodSpec;
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29 import com.oracle.truffle.dsl.processor.model.Parameter;
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30 import com.oracle.truffle.dsl.processor.model.ParameterSpec;
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31 import com.oracle.truffle.dsl.processor.model.Template;
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32 import com.oracle.truffle.dsl.processor.model.TemplateMethod;
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33 import java.util.ArrayList;
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34 import java.util.Collections;
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35 import java.util.List;
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36 import javax.lang.model.element.AnnotationMirror;
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37 import javax.lang.model.element.ExecutableElement;
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38 import javax.lang.model.element.VariableElement;
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39 import javax.lang.model.type.ArrayType;
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40 import javax.lang.model.type.TypeKind;
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41 import javax.lang.model.type.TypeMirror;
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42
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43 public final class MethodSpecParser {
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44
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45 private boolean emitErrors = true;
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46 private boolean useVarArgs = false;
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47
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48 private final Template template;
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49
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50 public MethodSpecParser(Template template) {
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51 this.template = template;
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52 }
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53
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54 public Template getTemplate() {
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55 return template;
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56 }
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57
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58 public boolean isEmitErrors() {
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59 return emitErrors;
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60 }
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61
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62 public boolean isUseVarArgs() {
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63 return useVarArgs;
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64 }
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65
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66 public void setEmitErrors(boolean emitErrors) {
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67 this.emitErrors = emitErrors;
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68 }
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69
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70 public void setUseVarArgs(boolean useVarArgs) {
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71 this.useVarArgs = useVarArgs;
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72 }
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73
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74 public TemplateMethod parse(MethodSpec methodSpecification, ExecutableElement method, AnnotationMirror annotation, int naturalOrder) {
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75 if (methodSpecification == null) {
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76 return null;
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77 }
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78
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79 methodSpecification.applyTypeDefinitions("types");
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80
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81 String id = method.getSimpleName().toString();
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82 TypeMirror returnType = method.getReturnType();
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83 return parseImpl(methodSpecification, naturalOrder, id, method, annotation, returnType, method.getParameters());
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84 }
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85
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86 public TemplateMethod parseImpl(MethodSpec methodSpecification, int naturalOrder, String id, ExecutableElement method, AnnotationMirror annotation, TypeMirror returnType,
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87 List<? extends VariableElement> parameterTypes) {
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88 ParameterSpec returnTypeSpec = methodSpecification.getReturnType();
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89 Parameter returnTypeMirror = matchParameter(returnTypeSpec, new CodeVariableElement(returnType, "returnType"), -1, -1);
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90 if (returnTypeMirror == null) {
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91 if (isEmitErrors() && method != null) {
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92 TemplateMethod invalidMethod = new TemplateMethod(id, naturalOrder, template, methodSpecification, method, annotation, returnTypeMirror, Collections.<Parameter> emptyList());
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93 String expectedReturnType = returnTypeSpec.toSignatureString(true);
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94 String actualReturnType = ElementUtils.getSimpleName(returnType);
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95
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96 String message = String.format("The provided return type \"%s\" does not match expected return type \"%s\".\nExpected signature: \n %s", actualReturnType, expectedReturnType,
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97 methodSpecification.toSignatureString(method.getSimpleName().toString()));
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98 invalidMethod.addError(message);
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99 return invalidMethod;
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100 } else {
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101 return null;
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102 }
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103 }
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104
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105 List<Parameter> parameters = parseParameters(methodSpecification, parameterTypes, isUseVarArgs() && method != null ? method.isVarArgs() : false);
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106 if (parameters == null) {
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107 if (isEmitErrors() && method != null) {
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108 TemplateMethod invalidMethod = new TemplateMethod(id, naturalOrder, template, methodSpecification, method, annotation, returnTypeMirror, Collections.<Parameter> emptyList());
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109 String message = String.format("Method signature %s does not match to the expected signature: \n%s", createActualSignature(method),
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110 methodSpecification.toSignatureString(method.getSimpleName().toString()));
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111 invalidMethod.addError(message);
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112 return invalidMethod;
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113 } else {
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114 return null;
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115 }
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116 }
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117
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118 return new TemplateMethod(id, naturalOrder, template, methodSpecification, method, annotation, returnTypeMirror, parameters);
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119 }
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120
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121 private static String createActualSignature(ExecutableElement method) {
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122 StringBuilder b = new StringBuilder("(");
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123 String sep = "";
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124 if (method != null) {
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125 for (VariableElement var : method.getParameters()) {
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126 b.append(sep);
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127 b.append(ElementUtils.getSimpleName(var.asType()));
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128 sep = ", ";
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129 }
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130 }
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131 b.append(")");
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132 return b.toString();
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133 }
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134
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135 /*
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136 * Parameter parsing tries to parse required arguments starting from offset 0 with increasing
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137 * offset until it finds a signature end that matches the required specification. If there is no
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138 * end matching the required arguments, parsing fails. Parameters prior to the parsed required
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139 * ones are cut and used to parse the optional parameters.
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140 */
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141 private static List<Parameter> parseParameters(MethodSpec spec, List<? extends VariableElement> parameterTypes, boolean varArgs) {
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142 List<Parameter> parsedRequired = null;
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143 int offset = 0;
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144 for (; offset <= parameterTypes.size(); offset++) {
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145 List<VariableElement> parameters = new ArrayList<>();
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146 parameters.addAll(parameterTypes.subList(offset, parameterTypes.size()));
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147 parsedRequired = parseParametersRequired(spec, parameters, varArgs);
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148 if (parsedRequired != null) {
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149 break;
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150 }
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151 }
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152
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153 if (parsedRequired == null) {
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154 return null;
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155 }
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156
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157 if (parsedRequired.isEmpty() && offset == 0) {
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158 offset = parameterTypes.size();
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159 }
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160 List<? extends VariableElement> potentialOptionals = parameterTypes.subList(0, offset);
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161 List<Parameter> parsedOptionals = parseParametersOptional(spec, potentialOptionals);
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162 if (parsedOptionals == null) {
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163 return null;
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164 }
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165
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166 List<Parameter> finalParameters = new ArrayList<>();
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167 finalParameters.addAll(parsedOptionals);
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168 finalParameters.addAll(parsedRequired);
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169 return finalParameters;
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170 }
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171
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172 private static List<Parameter> parseParametersOptional(MethodSpec spec, List<? extends VariableElement> types) {
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173 List<Parameter> parsedParams = new ArrayList<>();
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174
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175 int typeStartIndex = 0;
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176 List<ParameterSpec> specifications = spec.getOptional();
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177 outer: for (int specIndex = 0; specIndex < specifications.size(); specIndex++) {
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178 ParameterSpec specification = specifications.get(specIndex);
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179 for (int typeIndex = typeStartIndex; typeIndex < types.size(); typeIndex++) {
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180 VariableElement variable = types.get(typeIndex);
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181 Parameter optionalParam = matchParameter(specification, variable, -1, -1);
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182 if (optionalParam != null) {
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183 parsedParams.add(optionalParam);
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184 typeStartIndex = typeIndex + 1;
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185 continue outer;
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186 }
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187 }
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188 }
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189
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190 if (typeStartIndex < types.size()) {
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191 // not enough types found
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192 return null;
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193 }
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194 return parsedParams;
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195 }
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196
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197 private static List<Parameter> parseParametersRequired(MethodSpec spec, List<VariableElement> types, boolean typeVarArgs) {
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198 List<Parameter> parsedParams = new ArrayList<>();
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199 List<ParameterSpec> specifications = spec.getRequired();
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200 boolean specVarArgs = spec.isVariableRequiredParameters();
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201 int typeIndex = 0;
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202 int specificationIndex = 0;
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203
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diff changeset
204 ParameterSpec specification;
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205 while ((specification = nextSpecification(specifications, specificationIndex, specVarArgs)) != null) {
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206 VariableElement actualType = nextActualType(types, typeIndex, typeVarArgs);
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207 if (actualType == null) {
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208 if (spec.isIgnoreAdditionalSpecifications()) {
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209 break;
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210 }
2db61eddcb97 Truffle-DSL: argument syntax support for guards
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211 return null;
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212 }
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213
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214 int typeVarArgsIndex = typeVarArgs ? typeIndex - types.size() + 1 : -1;
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215 int specVarArgsIndex = specVarArgs ? specificationIndex - specifications.size() + 1 : -1;
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216
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217 if (typeVarArgsIndex >= 0 && specVarArgsIndex >= 0) {
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218 // both specifications and types have a variable number of arguments
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diff changeset
219 // we would get into an endless loop if we would continue
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diff changeset
220 break;
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parents:
diff changeset
221 }
2db61eddcb97 Truffle-DSL: argument syntax support for guards
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diff changeset
222
2db61eddcb97 Truffle-DSL: argument syntax support for guards
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diff changeset
223 Parameter resolvedParameter = matchParameter(specification, actualType, specVarArgsIndex, typeVarArgsIndex);
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diff changeset
224 if (resolvedParameter == null) {
2db61eddcb97 Truffle-DSL: argument syntax support for guards
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225 return null;
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diff changeset
226 }
2db61eddcb97 Truffle-DSL: argument syntax support for guards
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diff changeset
227 parsedParams.add(resolvedParameter);
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228 typeIndex++;
2db61eddcb97 Truffle-DSL: argument syntax support for guards
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diff changeset
229 specificationIndex++;
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230 }
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diff changeset
231
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232 // consume randomly ordered annotated parameters
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diff changeset
233 VariableElement variable;
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diff changeset
234 while ((variable = nextActualType(types, typeIndex, typeVarArgs)) != null) {
62c43fcf5be2 Truffle-DSL: implement @Cached and fixes for the new guard expression syntax.
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diff changeset
235 Parameter matchedParamter = matchAnnotatedParameter(spec, variable);
62c43fcf5be2 Truffle-DSL: implement @Cached and fixes for the new guard expression syntax.
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diff changeset
236 if (matchedParamter == null) {
62c43fcf5be2 Truffle-DSL: implement @Cached and fixes for the new guard expression syntax.
Christian Humer <christian.humer@gmail.com>
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diff changeset
237 break;
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Christian Humer <christian.humer@gmail.com>
parents: 19283
diff changeset
238 }
62c43fcf5be2 Truffle-DSL: implement @Cached and fixes for the new guard expression syntax.
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diff changeset
239 parsedParams.add(matchedParamter);
62c43fcf5be2 Truffle-DSL: implement @Cached and fixes for the new guard expression syntax.
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diff changeset
240 typeIndex++;
62c43fcf5be2 Truffle-DSL: implement @Cached and fixes for the new guard expression syntax.
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diff changeset
241 }
62c43fcf5be2 Truffle-DSL: implement @Cached and fixes for the new guard expression syntax.
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parents: 19283
diff changeset
242
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243 if (typeIndex < types.size()) {
2db61eddcb97 Truffle-DSL: argument syntax support for guards
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diff changeset
244 if (spec.isIgnoreAdditionalParameters()) {
2db61eddcb97 Truffle-DSL: argument syntax support for guards
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diff changeset
245 return parsedParams;
2db61eddcb97 Truffle-DSL: argument syntax support for guards
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parents:
diff changeset
246 } else {
2db61eddcb97 Truffle-DSL: argument syntax support for guards
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247 return null;
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parents:
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248 }
2db61eddcb97 Truffle-DSL: argument syntax support for guards
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diff changeset
249 }
2db61eddcb97 Truffle-DSL: argument syntax support for guards
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parents:
diff changeset
250
2db61eddcb97 Truffle-DSL: argument syntax support for guards
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diff changeset
251 return parsedParams;
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parents:
diff changeset
252 }
2db61eddcb97 Truffle-DSL: argument syntax support for guards
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parents:
diff changeset
253
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254 private static Parameter matchAnnotatedParameter(MethodSpec spec, VariableElement variable) {
19289
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diff changeset
255 for (ParameterSpec parameterSpec : spec.getAnnotations()) {
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diff changeset
256 if (parameterSpec.matches(variable)) {
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diff changeset
257 Parameter matchedParameter = matchParameter(parameterSpec, variable, -1, -1);
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diff changeset
258 if (matchedParameter != null) {
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diff changeset
259 matchedParameter.setLocalName(variable.getSimpleName().toString());
62c43fcf5be2 Truffle-DSL: implement @Cached and fixes for the new guard expression syntax.
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diff changeset
260 return matchedParameter;
62c43fcf5be2 Truffle-DSL: implement @Cached and fixes for the new guard expression syntax.
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parents: 19283
diff changeset
261 }
62c43fcf5be2 Truffle-DSL: implement @Cached and fixes for the new guard expression syntax.
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parents: 19283
diff changeset
262 }
62c43fcf5be2 Truffle-DSL: implement @Cached and fixes for the new guard expression syntax.
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diff changeset
263 }
62c43fcf5be2 Truffle-DSL: implement @Cached and fixes for the new guard expression syntax.
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parents: 19283
diff changeset
264 return null;
62c43fcf5be2 Truffle-DSL: implement @Cached and fixes for the new guard expression syntax.
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parents: 19283
diff changeset
265 }
62c43fcf5be2 Truffle-DSL: implement @Cached and fixes for the new guard expression syntax.
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diff changeset
266
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267 private static ParameterSpec nextSpecification(List<ParameterSpec> specifications, int specIndex, boolean varArgs) {
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268 if (varArgs && specIndex >= specifications.size() - 1 && !specifications.isEmpty()) {
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parents:
diff changeset
269 return specifications.get(specifications.size() - 1);
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parents:
diff changeset
270 } else if (specIndex < specifications.size()) {
2db61eddcb97 Truffle-DSL: argument syntax support for guards
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diff changeset
271 return specifications.get(specIndex);
2db61eddcb97 Truffle-DSL: argument syntax support for guards
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parents:
diff changeset
272 } else {
2db61eddcb97 Truffle-DSL: argument syntax support for guards
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diff changeset
273 return null;
2db61eddcb97 Truffle-DSL: argument syntax support for guards
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parents:
diff changeset
274 }
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275 }
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276
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277 private static VariableElement nextActualType(List<VariableElement> types, int typeIndex, boolean varArgs) {
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278 if (varArgs && typeIndex >= types.size() - 1 && !types.isEmpty()) {
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279 // unpack varargs array argument
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280 VariableElement actualType = types.get(types.size() - 1);
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281 if (actualType.asType().getKind() == TypeKind.ARRAY) {
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282 actualType = new CodeVariableElement(((ArrayType) actualType.asType()).getComponentType(), actualType.getSimpleName().toString());
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283 }
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284 return actualType;
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285 } else if (typeIndex < types.size()) {
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286 return types.get(typeIndex);
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287 } else {
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288 return null;
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289 }
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290 }
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291
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292 private static Parameter matchParameter(ParameterSpec specification, VariableElement variable, int specificationIndex, int varArgsIndex) {
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293 TypeMirror resolvedType = variable.asType();
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294 if (hasError(resolvedType)) {
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295 return null;
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296 }
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297
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298 if (!specification.matches(variable)) {
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299 return null;
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300 }
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301
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302 return new Parameter(specification, variable, specificationIndex, varArgsIndex);
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303 }
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304 }