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1 /*
2  * Copyright (C) 2016 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package art;
18 
19 import java.lang.reflect.InvocationTargetException;
20 import java.lang.reflect.Method;
21 import java.util.Base64;
22 
23 public class Test984 {
24 
25   static class Transform {
26     // This method must be 'static' so that when we try to invoke it through a j.l.r.Method we will
27     // simply use the jmethodID directly and not do any lookup in any receiver object.
sayHi(Runnable r)28     public static void sayHi(Runnable r) {
29       System.out.println("hello");
30       r.run();
31       System.out.println("goodbye");
32     }
33   }
34   // static class Transform {
35   //   public static void sayHi(Runnable r) {
36   //     System.out.println("Hello - Transformed");
37   //     r.run();
38   //     System.out.println("Goodbye - Transformed");
39   //   }
40   // }
41   private static final byte[] CLASS_BYTES = Base64.getDecoder().decode(
42     "yv66vgAAADQAKAoACAARCQASABMIABQKABUAFgsAFwAYCAAZBwAbBwAeAQAGPGluaXQ+AQADKClW" +
43     "AQAEQ29kZQEAD0xpbmVOdW1iZXJUYWJsZQEABXNheUhpAQAXKExqYXZhL2xhbmcvUnVubmFibGU7" +
44     "KVYBAApTb3VyY2VGaWxlAQAMVGVzdDk4NC5qYXZhDAAJAAoHAB8MACAAIQEAE0hlbGxvIC0gVHJh" +
45     "bnNmb3JtZWQHACIMACMAJAcAJQwAJgAKAQAVR29vZGJ5ZSAtIFRyYW5zZm9ybWVkBwAnAQAVYXJ0" +
46     "L1Rlc3Q5ODQkVHJhbnNmb3JtAQAJVHJhbnNmb3JtAQAMSW5uZXJDbGFzc2VzAQAQamF2YS9sYW5n" +
47     "L09iamVjdAEAEGphdmEvbGFuZy9TeXN0ZW0BAANvdXQBABVMamF2YS9pby9QcmludFN0cmVhbTsB" +
48     "ABNqYXZhL2lvL1ByaW50U3RyZWFtAQAHcHJpbnRsbgEAFShMamF2YS9sYW5nL1N0cmluZzspVgEA" +
49     "EmphdmEvbGFuZy9SdW5uYWJsZQEAA3J1bgEAC2FydC9UZXN0OTg0ACAABwAIAAAAAAACAAAACQAK" +
50     "AAEACwAAAB0AAQABAAAABSq3AAGxAAAAAQAMAAAABgABAAAABQAJAA0ADgABAAsAAAA7AAIAAQAA" +
51     "ABeyAAISA7YABCq5AAUBALIAAhIGtgAEsQAAAAEADAAAABIABAAAAAcACAAIAA4ACQAWAAoAAgAP" +
52     "AAAAAgAQAB0AAAAKAAEABwAaABwACA==");
53   private static final byte[] DEX_BYTES = Base64.getDecoder().decode(
54     "ZGV4CjAzNQB/mxSMAAAAAAAAAAAAAAAAAAAAAAAAAAA8BAAAcAAAAHhWNBIAAAAAAAAAAHgDAAAX" +
55     "AAAAcAAAAAoAAADMAAAAAwAAAPQAAAABAAAAGAEAAAUAAAAgAQAAAQAAAEgBAADUAgAAaAEAAGgB" +
56     "AABwAQAAhwEAAJwBAAC1AQAAxAEAAOgBAAAIAgAAHwIAADMCAABJAgAAXQIAAHECAAB/AgAAigIA" +
57     "AI0CAACRAgAAngIAAKQCAACpAgAAsgIAALcCAAC+AgAAAwAAAAQAAAAFAAAABgAAAAcAAAAIAAAA" +
58     "CQAAAAoAAAALAAAADgAAAA4AAAAJAAAAAAAAAA8AAAAJAAAAyAIAAA8AAAAJAAAA0AIAAAgABAAS" +
59     "AAAAAAAAAAAAAAAAAAEAFQAAAAQAAgATAAAABQAAAAAAAAAGAAAAFAAAAAAAAAAAAAAABQAAAAAA" +
60     "AAAMAAAAaAMAADwDAAAAAAAABjxpbml0PgAVR29vZGJ5ZSAtIFRyYW5zZm9ybWVkABNIZWxsbyAt" +
61     "IFRyYW5zZm9ybWVkABdMYXJ0L1Rlc3Q5ODQkVHJhbnNmb3JtOwANTGFydC9UZXN0OTg0OwAiTGRh" +
62     "bHZpay9hbm5vdGF0aW9uL0VuY2xvc2luZ0NsYXNzOwAeTGRhbHZpay9hbm5vdGF0aW9uL0lubmVy" +
63     "Q2xhc3M7ABVMamF2YS9pby9QcmludFN0cmVhbTsAEkxqYXZhL2xhbmcvT2JqZWN0OwAUTGphdmEv" +
64     "bGFuZy9SdW5uYWJsZTsAEkxqYXZhL2xhbmcvU3RyaW5nOwASTGphdmEvbGFuZy9TeXN0ZW07AAxU" +
65     "ZXN0OTg0LmphdmEACVRyYW5zZm9ybQABVgACVkwAC2FjY2Vzc0ZsYWdzAARuYW1lAANvdXQAB3By" +
66     "aW50bG4AA3J1bgAFc2F5SGkABXZhbHVlAAAAAAEAAAAGAAAAAQAAAAcAAAAFAAcOAAcBAAcOAQgP" +
67     "AQMPAQgPAAEAAQABAAAA2AIAAAQAAABwEAMAAAAOAAMAAQACAAAA3QIAABQAAABiAAAAGwECAAAA" +
68     "biACABAAchAEAAIAYgAAABsBAQAAAG4gAgAQAA4AAAACAACAgATsBQEJhAYAAAICARYYAQIDAhAE" +
69     "CBEXDQACAAAATAMAAFIDAABcAwAAAAAAAAAAAAAAAAAAEAAAAAAAAAABAAAAAAAAAAEAAAAXAAAA" +
70     "cAAAAAIAAAAKAAAAzAAAAAMAAAADAAAA9AAAAAQAAAABAAAAGAEAAAUAAAAFAAAAIAEAAAYAAAAB" +
71     "AAAASAEAAAIgAAAXAAAAaAEAAAEQAAACAAAAyAIAAAMgAAACAAAA2AIAAAEgAAACAAAA7AIAAAAg" +
72     "AAABAAAAPAMAAAQgAAACAAAATAMAAAMQAAABAAAAXAMAAAYgAAABAAAAaAMAAAAQAAABAAAAeAMA" +
73     "AA==");
74 
run()75   public static void run() {
76     doTest();
77   }
78 
79   // The Method that holds an obsolete method pointer. We will fill it in by getting a jmethodID
80   // from a stack with an obsolete method in it. There should be no other ways to obtain an obsolete
81   // jmethodID in ART without unsafe casts.
82   public static Method obsolete_method = null;
83 
doTest()84   public static void doTest() {
85     // Capture the obsolete method.
86     //
87     // NB The obsolete method must be direct so that we will not look in the receiver type to get
88     // the actual method.
89     Transform.sayHi(() -> {
90       System.out.println("transforming calling function");
91       Redefinition.doCommonClassRedefinition(Transform.class, CLASS_BYTES, DEX_BYTES);
92       System.out.println("Retrieving obsolete method from current stack");
93       // This should get the obsolete sayHi method (as the only obsolete method on the current
94       // threads stack).
95       Test984.obsolete_method = getFirstObsoleteMethod984();
96     });
97 
98     // Prove we did actually redefine something.
99     System.out.println("Invoking redefined version of method.");
100     Transform.sayHi(() -> { System.out.println("Not doing anything here"); });
101 
102     System.out.println("invoking obsolete method");
103     try {
104       obsolete_method.invoke(null, (Runnable)() -> {
105         throw new Error("Unexpected code running from invoke of obsolete method!");
106       });
107       throw new Error("Running obsolete method did not throw exception");
108     } catch (Throwable e) {
109       // On newer RI InternalError has been replaced by InvocationTargetException.
110       if (e instanceof InternalError || e.getCause() instanceof InternalError ||
111               e instanceof InvocationTargetException ||
112               e.getCause() instanceof InvocationTargetException) {
113         System.out.println("Caught expected error from attempting to invoke an obsolete method.");
114       } else {
115         System.out.println("Unexpected error type for calling obsolete method! Expected either "
116             + "an InternalError or something that is caused by an InternalError.");
117         throw new Error("Unexpected error caught: ", e);
118       }
119     }
120   }
121 
122   // Gets the first obsolete method on the current threads stack (NB only looks through the first 30
123   // stack frames).
getFirstObsoleteMethod984()124   private static native Method getFirstObsoleteMethod984();
125 }
126