1 /*
2 * Copyright (c) 2009, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 package invokespecial;
26
27 import java.lang.reflect.Method;
28 import java.lang.reflect.Modifier;
29
30 public class Checker extends shared.Checker {
31
32 public Checker(Class staticTargetClass, Class dynamicTargetClass) {
33 super(staticTargetClass, dynamicTargetClass);
34 }
35
36 public String check (Class callerClass) {
37 /*
38 * If objectref is null, the invokespecial instruction throws a NullPointerException.
39 */
40 if (dynamicTargetClass == null) {
41 return "java.lang.NullPointerException";
42 }
43
44 /*
45 * TODO: find a citiation from spec for this case
46 */
47 Method resolvedMethod;
48 try {
49 // May throw VerifyError
50 resolvedMethod = getMethodInHierarchy(staticTargetClass);
51 } catch (Throwable e) {
52 return e.getClass().getName();
53 }
54
55 if (resolvedMethod == null) {
56 return "java.lang.NoSuchMethodError";
57 }
58
59 /*
60 * If:
61 * - the resolved method is protected (4.7)
62 * - it is a member of a superclass of the current class
63 * - the method is not declared in the same run-time package (5.3) as the current class
64 * then:
65 * the class of objectref must be either the current class or a subclass of the
66 * current class.
67 */
68
69 if (Modifier.isProtected(resolvedMethod.getModifiers())) {
70 Method methodInSuperclass = getMethodInHierarchy(resolvedMethod.getDeclaringClass().getSuperclass());
71
72 if (methodInSuperclass != null) {
73 String resolvedMethodPkg = getClassPackageName(resolvedMethod.getDeclaringClass());
74 String methodInSuperclassPkg = getClassPackageName(methodInSuperclass.getDeclaringClass());
75
76 if (!resolvedMethodPkg.equals(methodInSuperclassPkg)) {
77 //TODO: clarify this
78 // if (callerClass == methodInSuperclass.getDeclaringClass()) {
79 // return "java.lang.IllegalAccessError";
80 // }
81 }
82 }
83 }
84
85 /*
86 * The resolved method is selected for invocation unless all of
87 * the following conditions are true:
88 * * TODO: The ACC_SUPER flag (see Table 4.1, "Class access and property
89 * modifiers") is set for the current class.
90 * * The class of the resolved method is a superclass of the
91 * current class - assumed by construction procedure
92 *
93 * * The resolved method is not an instance initialization method (3.9).
94 */
95 if (!"<init>".equals(methodName)) {
96 /*
97 * Let C be the direct superclass of the current class:
98 * * If C contains a declaration for an instance method with the same
99 * name and descriptor as the resolved method, then this method will be
100 * invoked. The lookup procedure terminates.
101 * * Otherwise, if C has a superclass, this same lookup procedure is
102 * performed recursively using the direct superclass of C. The method to
103 * be invoked is the result of the recursive invocation of this lookup
104 * procedure.
105 * * Otherwise, an AbstractMethodError is raised.
106 * TODO: so far, sometimes NSME is thrown
107 */
108 Class klass = dynamicTargetClass.getSuperclass();
109
110 while (klass != Object.class) {
111 Method method = getDeclaredMethod(klass);
112
113 if (method != null) {
114 /*
115 * If the resolved method is a class (static) method, the
116 * invokespecial instruction throws an IncompatibleClassChangeError.
117 */
118 if (Modifier.isStatic(method.getModifiers())) {
119 return "java.lang.IncompatibleClassChangeError";
120 }
121
122 // Check access rights
123 if ( checkAccess(method, callerClass)
124 // && !(
125 // Modifier.isProtected(method.getModifiers())
126 // && (
127 // staticTargetClass.isAssignableFrom(callerClass)
128 // || getClassPackageName(staticTargetClass).equals(getClassPackageName(callerClass))
129 // )
130 //
131 // )
132 )
133 {
134 return String.format("%s.%s"
135 , method.getDeclaringClass().getSimpleName()
136 , methodName
137 );
138 } else {
139 // IAE is thrown when located method can't be accessed from the call site
140 return "java.lang.IllegalAccessError";
141 }
142 }
143
144 klass = klass.getSuperclass();
145 }
146
147 return "java.lang.AbstractMethodError";
148 } else {
149 // The resolved method is an instance initialization method (3.9).
150 }
151
152 // TODO: change
153 return "---";
154 }
155 }