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1 /* |
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2 * Copyright (c) 2009, 2019, 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 package invokespecial; |
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26 |
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27 import java.lang.reflect.Method; |
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28 import java.lang.reflect.Modifier; |
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29 |
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30 public class Checker extends shared.Checker { |
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31 |
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32 public Checker(Class staticTargetClass, Class dynamicTargetClass) { |
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33 super(staticTargetClass, dynamicTargetClass); |
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34 } |
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35 |
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36 public String check (Class callerClass) { |
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37 // If objectref is null, the invokespecial instruction throws a NullPointerException. |
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38 if (dynamicTargetClass == null) { |
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39 return "java.lang.NullPointerException"; |
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40 } |
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41 |
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42 // TODO: find a citation from spec for this case |
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43 Method resolvedMethod; |
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44 try { |
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45 // May throw VerifyError |
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46 resolvedMethod = getMethodInHierarchy(staticTargetClass); |
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47 } catch (Throwable e) { |
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48 return e.getClass().getName(); |
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49 } |
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50 |
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51 if (resolvedMethod == null) { |
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52 return "java.lang.NoSuchMethodError"; |
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53 } |
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54 |
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55 // If: |
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56 // - the resolved method is protected (4.7) |
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57 // - it is a member of a superclass of the current class |
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58 // - the method is not declared in the same run-time package (5.3) as the current class |
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59 // then: |
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60 // the class of objectref must be either the current class or a subclass of the |
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61 // current class. |
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62 |
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63 if (Modifier.isProtected(resolvedMethod.getModifiers())) { |
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64 Method methodInSuperclass = getMethodInHierarchy(resolvedMethod.getDeclaringClass().getSuperclass()); |
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65 |
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66 if (methodInSuperclass != null) { |
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67 String resolvedMethodPkg = getClassPackageName(resolvedMethod.getDeclaringClass()); |
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68 String methodInSuperclassPkg = getClassPackageName(methodInSuperclass.getDeclaringClass()); |
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69 |
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70 if (!resolvedMethodPkg.equals(methodInSuperclassPkg)) { |
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71 //TODO: clarify this |
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72 // if (callerClass == methodInSuperclass.getDeclaringClass()) { |
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73 // return "java.lang.IllegalAccessError"; |
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74 // } |
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75 } |
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76 } |
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77 } |
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78 |
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79 /* |
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80 * The resolved method is selected for invocation unless all of |
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81 * the following conditions are true: |
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82 * * TODO: The ACC_SUPER flag (see Table 4.1, "Class access and property |
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83 * modifiers") is set for the current class. |
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84 * * The class of the resolved method is a superclass of the |
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85 * current class - assumed by construction procedure |
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86 * |
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87 * * The resolved method is not an instance initialization method (3.9). |
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88 */ |
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89 if (!"<init>".equals(methodName)) { |
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90 /* |
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91 * Let C be the direct superclass of the current class: |
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92 * * If C contains a declaration for an instance method with the same |
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93 * name and descriptor as the resolved method, then this method will be |
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94 * invoked. The lookup procedure terminates. |
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95 * * Otherwise, if C has a superclass, this same lookup procedure is |
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96 * performed recursively using the direct superclass of C. The method to |
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97 * be invoked is the result of the recursive invocation of this lookup |
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98 * procedure. |
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99 * * Otherwise, an AbstractMethodError is raised. |
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100 * TODO: so far, sometimes NSME is thrown |
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101 */ |
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102 Class klass = dynamicTargetClass.getSuperclass(); |
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103 |
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104 while (klass != Object.class) { |
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105 Method method = getDeclaredMethod(klass); |
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106 |
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107 if (method != null) { |
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108 /* |
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109 * If the resolved method is a class (static) method, the |
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110 * invokespecial instruction throws an IncompatibleClassChangeError. |
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111 */ |
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112 if (Modifier.isStatic(method.getModifiers())) { |
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113 return "java.lang.IncompatibleClassChangeError"; |
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114 } |
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115 |
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116 // Check access rights |
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117 if ( checkAccess(method, callerClass) |
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118 // && !( |
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119 // Modifier.isProtected(method.getModifiers()) |
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120 // && ( |
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121 // staticTargetClass.isAssignableFrom(callerClass) |
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122 // || getClassPackageName(staticTargetClass).equals(getClassPackageName(callerClass)) |
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123 // ) |
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124 // |
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125 // ) |
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126 ) |
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127 { |
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128 return String.format("%s.%s" |
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129 , method.getDeclaringClass().getSimpleName() |
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130 , methodName |
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131 ); |
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132 } else { |
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133 // IAE is thrown when located method can't be accessed from the call site |
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134 return "java.lang.IllegalAccessError"; |
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135 } |
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136 } |
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137 |
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138 klass = klass.getSuperclass(); |
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139 } |
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140 |
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141 return "java.lang.AbstractMethodError"; |
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142 } else { |
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143 // The resolved method is an instance initialization method (3.9). |
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144 } |
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145 |
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146 // TODO: change |
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147 return "---"; |
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148 } |
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149 } |