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1 /* |
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2 * Copyright (c) 2013, 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 |
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24 /* |
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25 * @test |
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26 * @bug 7118412 |
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27 * @summary Shadowing of type-variables vs. member types |
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28 */ |
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29 import java.io.File; |
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30 import java.io.FileWriter; |
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31 import java.io.IOException; |
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32 import java.io.PrintWriter; |
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33 import java.io.StringWriter; |
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34 |
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35 public class ShadowingTest { |
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36 |
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37 // We generate a method "test" that tries to call T.<something, |
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38 // depending on the value of MethodCall>. This controls whether |
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39 // "test" is static or not. |
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40 private enum MethodContext { |
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41 STATIC("static "), |
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42 INSTANCE(""); |
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43 |
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44 public final String methodcontext; |
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45 |
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46 MethodContext(final String methodcontext) { |
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47 this.methodcontext = methodcontext; |
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48 } |
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49 } |
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50 |
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51 // These control whether or not a type parameter, method type |
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52 // parameter, or inner class get declared (and in the case of |
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53 // inner classes, whether it's static or not. |
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54 |
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55 private enum MethodTypeParameterDecl { |
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56 NO(""), |
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57 YES("<T extends Number> "); |
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58 |
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59 public final String tyvar; |
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60 |
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61 MethodTypeParameterDecl(final String tyvar) { |
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62 this.tyvar = tyvar; |
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63 } |
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64 } |
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65 |
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66 private enum InsideDef { |
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67 NONE(""), |
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68 STATIC("static class T { public void inner() {} }\n"), |
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69 INSTANCE("class T { public void inner() {} }\n"); |
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70 |
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71 public final String instancedef; |
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72 |
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73 InsideDef(final String instancedef) { |
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74 this.instancedef = instancedef; |
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75 } |
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76 } |
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77 |
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78 private enum TypeParameterDecl { |
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79 NO(""), |
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80 YES("<T extends Collection>"); |
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81 |
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82 public final String tyvar; |
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83 |
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84 TypeParameterDecl(final String tyvar) { |
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85 this.tyvar = tyvar; |
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86 } |
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87 } |
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88 |
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89 // Represents what method we try to call. This is a way of |
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90 // checking which T we're seeing. |
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91 private enum MethodCall { |
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92 // Method type variables extend Number, so we have intValue |
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93 METHOD_TYPEVAR("intValue"), |
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94 // The inner class declaration has a method called "inner" |
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95 INNER_CLASS("inner"), |
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96 // The class type variables extend Collection, so we call iterator |
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97 TYPEVAR("iterator"), |
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98 // The outer class declaration has a method called "outer" |
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99 OUTER_CLASS("outer"); |
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100 |
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101 public final String methodcall; |
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102 |
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103 MethodCall(final String methodcall) { |
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104 this.methodcall = methodcall; |
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105 } |
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106 |
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107 } |
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108 |
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109 public boolean succeeds(final MethodCall call, |
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110 final MethodTypeParameterDecl mtyvar, |
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111 final MethodContext ctx, |
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112 final InsideDef inside, |
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113 final TypeParameterDecl tyvar) { |
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114 switch(call) { |
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115 // We want to resolve to the method type variable |
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116 case METHOD_TYPEVAR: switch(mtyvar) { |
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117 // If the method type variable exists, then T will |
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118 // resolve to it, and we'll have intValue. |
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119 case YES: return true; |
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120 // Otherwise, this cannot succeed. |
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121 default: return false; |
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122 } |
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123 // We want to resolve to the inner class |
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124 case INNER_CLASS: switch(mtyvar) { |
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125 // The method type parameter will shadow the inner |
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126 // class, so there can't be one. |
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127 case NO: switch(ctx) { |
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128 // If we're not static, then either one should succeed. |
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129 case INSTANCE: switch(inside) { |
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130 case INSTANCE: |
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131 case STATIC: |
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132 return true; |
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133 default: return false; |
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134 } |
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135 case STATIC: switch(inside) { |
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136 // If we are static, and the inner class is |
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137 // static, then we also succeed, because we |
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138 // can't see the type variable. |
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139 case STATIC: return true; |
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140 case INSTANCE: switch(tyvar) { |
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141 // If we're calling from a non-static |
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142 // context, there can't be a class type |
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143 // variable, because that will shadow the |
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144 // static inner class definition. |
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145 case NO: return true; |
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146 default: return false; |
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147 } |
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148 // If the inner class isn't declared, we can't |
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149 // see it. |
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150 default: return false; |
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151 } |
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152 // Can't get here. |
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153 default: return false; |
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154 } |
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155 default: return false; |
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156 } |
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157 // We want to resolve to the class type parameter |
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158 case TYPEVAR: switch(mtyvar) { |
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159 // We can't have a method type parameter, as that would |
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160 // shadow the class type parameter |
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161 case NO: switch(ctx) { |
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162 case INSTANCE: switch(inside) { |
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163 // We have to be in an instance context. If |
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164 // we're static, we can't see the type |
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165 // variable. |
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166 case NONE: switch(tyvar) { |
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167 // Obviously, the type parameter has to be declared. |
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168 case YES: return true; |
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169 default: return false; |
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170 } |
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171 default: return false; |
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172 } |
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173 default: return false; |
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174 } |
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175 default: return false; |
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176 } |
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177 // We want to resolve to the outer class |
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178 case OUTER_CLASS: switch(mtyvar) { |
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179 case NO: switch(inside) { |
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180 case NONE: switch(tyvar) { |
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181 // Basically, nothing else can be declared, or |
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182 // else we can't see it. Even if our context |
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183 // is static, the compiler will complain if |
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184 // non-static T's exist, because they will |
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185 // shadow the outer class. |
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186 case NO: return true; |
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187 default: return false; |
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188 } |
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189 default: return false; |
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190 } |
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191 default: return false; |
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192 } |
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193 } |
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194 return false; |
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195 } |
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196 |
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197 private static final File classesdir = new File("7118412"); |
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198 |
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199 private int errors = 0; |
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200 |
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201 private int dirnum = 0; |
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202 |
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203 private void doTest(final MethodTypeParameterDecl mtyvar, |
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204 final TypeParameterDecl tyvar, |
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205 final InsideDef insidedef, final MethodContext ctx, |
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206 final MethodCall call) |
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207 throws IOException { |
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208 final String content = "import java.util.Collection;\n" + |
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209 "class Test" + tyvar.tyvar + " {\n" + |
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210 " " + insidedef.instancedef + |
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211 " " + ctx.methodcontext + mtyvar.tyvar + "void test(T t) { t." + |
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212 call.methodcall + "(); }\n" + |
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213 "}\n" + |
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214 "class T { void outer() {} }\n"; |
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215 final File dir = new File(classesdir, "" + dirnum); |
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216 final File Test_java = writeFile(dir, "Test.java", content); |
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217 dirnum++; |
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218 if(succeeds(call, mtyvar, ctx, insidedef, tyvar)) { |
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219 if(!assert_compile_succeed(Test_java)) |
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220 System.err.println("Failed file:\n" + content); |
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221 } |
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222 else { |
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223 if(!assert_compile_fail(Test_java)) |
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224 System.err.println("Failed file:\n" + content); |
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225 } |
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226 } |
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227 |
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228 private void run() throws Exception { |
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229 classesdir.mkdir(); |
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230 for(MethodTypeParameterDecl mtyvar : MethodTypeParameterDecl.values()) |
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231 for(TypeParameterDecl tyvar : TypeParameterDecl.values()) |
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232 for(InsideDef insidedef : InsideDef.values()) |
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233 for(MethodContext ctx : MethodContext.values()) |
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234 for(MethodCall methodcall : MethodCall.values()) |
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235 doTest(mtyvar, tyvar, insidedef, ctx, methodcall); |
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236 if (errors != 0) |
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237 throw new Exception("ShadowingTest test failed with " + |
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238 errors + " errors."); |
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239 } |
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240 |
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241 private boolean assert_compile_fail(final File file) { |
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242 final String filename = file.getPath(); |
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243 final String[] args = { filename }; |
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244 final StringWriter sw = new StringWriter(); |
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245 final PrintWriter pw = new PrintWriter(sw); |
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246 final int rc = com.sun.tools.javac.Main.compile(args, pw); |
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247 pw.close(); |
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248 if (rc == 0) { |
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249 System.err.println("Compilation of " + file.getName() + |
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250 " didn't fail as expected."); |
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251 errors++; |
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252 return false; |
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253 } else return true; |
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254 } |
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255 |
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256 private boolean assert_compile_succeed(final File file) { |
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257 final String filename = file.getPath(); |
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258 final String[] args = { filename }; |
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259 final StringWriter sw = new StringWriter(); |
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260 final PrintWriter pw = new PrintWriter(sw); |
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261 final int rc = com.sun.tools.javac.Main.compile(args, pw); |
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262 pw.close(); |
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263 if (rc != 0) { |
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264 System.err.println("Compilation of " + file.getName() + |
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265 " didn't succeed as expected. Output:"); |
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266 System.err.println(sw.toString()); |
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267 errors++; |
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268 return false; |
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269 } else return true; |
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270 } |
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271 |
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272 private File writeFile(final File dir, |
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273 final String path, |
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274 final String body) throws IOException { |
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275 final File f = new File(dir, path); |
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276 f.getParentFile().mkdirs(); |
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277 final FileWriter out = new FileWriter(f); |
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278 out.write(body); |
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279 out.close(); |
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280 return f; |
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281 } |
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282 |
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283 public static void main(String... args) throws Exception { |
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284 new ShadowingTest().run(); |
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285 } |
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286 |
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287 } |