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 import static art.Redefinition.doCommonClassRedefinition;
18 
19 import java.util.Base64;
20 import java.util.function.Consumer;
21 import java.lang.reflect.Method;
22 
23 public class Main {
24 
25   // import java.util.function.Consumer;
26   // class Transform {
27   //   public void sayHi(int recur, Consumer<String> reporter, Runnable r) {
28   //     reporter.accept("Hello" + recur + " - transformed");
29   //     if (recur == 1) {
30   //       r.run();
31   //       sayHi(recur - 1, reporter, r);
32   //     } else if (recur != 0) {
33   //       sayHi(recur - 1, reporter, r);
34   //     }
35   //     reporter.accept("Goodbye" + recur + " - transformed");
36   //   }
37   // }
38   private static final byte[] CLASS_BYTES = Base64.getDecoder().decode(
39     "yv66vgAAADQAMwoADgAaBwAbCgACABoIABwKAAIAHQoAAgAeCAAfCgACACALACEAIgsAIwAkCgAN" +
40     "ACUIACYHACcHACgBAAY8aW5pdD4BAAMoKVYBAARDb2RlAQAPTGluZU51bWJlclRhYmxlAQAFc2F5" +
41     "SGkBADUoSUxqYXZhL3V0aWwvZnVuY3Rpb24vQ29uc3VtZXI7TGphdmEvbGFuZy9SdW5uYWJsZTsp" +
42     "VgEADVN0YWNrTWFwVGFibGUBAAlTaWduYXR1cmUBAEkoSUxqYXZhL3V0aWwvZnVuY3Rpb24vQ29u" +
43     "c3VtZXI8TGphdmEvbGFuZy9TdHJpbmc7PjtMamF2YS9sYW5nL1J1bm5hYmxlOylWAQAKU291cmNl" +
44     "RmlsZQEADlRyYW5zZm9ybS5qYXZhDAAPABABABdqYXZhL2xhbmcvU3RyaW5nQnVpbGRlcgEABUhl" +
45     "bGxvDAApACoMACkAKwEADiAtIHRyYW5zZm9ybWVkDAAsAC0HAC4MAC8AMAcAMQwAMgAQDAATABQB" +
46     "AAdHb29kYnllAQAJVHJhbnNmb3JtAQAQamF2YS9sYW5nL09iamVjdAEABmFwcGVuZAEALShMamF2" +
47     "YS9sYW5nL1N0cmluZzspTGphdmEvbGFuZy9TdHJpbmdCdWlsZGVyOwEAHChJKUxqYXZhL2xhbmcv" +
48     "U3RyaW5nQnVpbGRlcjsBAAh0b1N0cmluZwEAFCgpTGphdmEvbGFuZy9TdHJpbmc7AQAbamF2YS91" +
49     "dGlsL2Z1bmN0aW9uL0NvbnN1bWVyAQAGYWNjZXB0AQAVKExqYXZhL2xhbmcvT2JqZWN0OylWAQAS" +
50     "amF2YS9sYW5nL1J1bm5hYmxlAQADcnVuACAADQAOAAAAAAACAAAADwAQAAEAEQAAAB0AAQABAAAA" +
51     "BSq3AAGxAAAAAQASAAAABgABAAAAAgABABMAFAACABEAAACfAAQABAAAAGEsuwACWbcAAxIEtgAF" +
52     "G7YABhIHtgAFtgAIuQAJAgAbBKAAFS25AAoBACobBGQsLbYAC6cAEBuZAAwqGwRkLC22AAssuwAC" +
53     "WbcAAxIMtgAFG7YABhIHtgAFtgAIuQAJAgCxAAAAAgASAAAAIgAIAAAABAAeAAUAIwAGACkABwA1" +
54     "AAgAOQAJAEIACwBgAAwAFQAAAAQAAjUMABYAAAACABcAAQAYAAAAAgAZ");
55   private static final byte[] DEX_BYTES = Base64.getDecoder().decode(
56     "ZGV4CjAzNQA7uevryhDgvad3G3EACTdspZGfNKv2i3kkBQAAcAAAAHhWNBIAAAAAAAAAAGwEAAAf" +
57     "AAAAcAAAAAkAAADsAAAABgAAABABAAAAAAAAAAAAAAkAAABYAQAAAQAAAKABAABkAwAAwAEAAMoC" +
58     "AADaAgAA3gIAAOICAADlAgAA7QIAAPECAAD6AgAAAQMAAAQDAAAHAwAACwMAAA8DAAAcAwAAOwMA" +
59     "AE8DAABlAwAAeQMAAJQDAACyAwAA0QMAAOEDAADkAwAA6gMAAO4DAAD2AwAA/gMAABIEAAAXBAAA" +
60     "HgQAACgEAAAIAAAADAAAAA0AAAAOAAAADwAAABAAAAARAAAAEwAAABUAAAAJAAAABQAAAAAAAAAK" +
61     "AAAABgAAAKgCAAALAAAABgAAALACAAAVAAAACAAAAAAAAAAWAAAACAAAALgCAAAXAAAACAAAAMQC" +
62     "AAABAAMABAAAAAEABAAcAAAAAwADAAQAAAAEAAMAGwAAAAYAAwAEAAAABgABABkAAAAGAAIAGQAA" +
63     "AAYAAAAdAAAABwAFABgAAAABAAAAAAAAAAMAAAAAAAAAFAAAAJACAABbBAAAAAAAAAEAAABHBAAA" +
64     "AQABAAEAAAAvBAAABAAAAHAQAgAAAA4ABgAEAAQAAAA0BAAAUAAAACIABgBwEAQAAAAbAQcAAABu" +
65     "IAYAEAAMAG4gBQAwAAwAGwEAAAAAbiAGABAADABuEAcAAAAMAHIgCAAEABIQMwMpAHIQAwAFANgA" +
66     "A/9uQAEAAlQiAAYAcBAEAAAAGwEGAAAAbiAGABAADABuIAUAMAAMABsBAAAAAG4gBgAQAAwAbhAH" +
67     "AAAADAByIAgABAAOADgD4f/YAAP/bkABAAJUKNoAAAAAAAAAAAEAAAAAAAAAAQAAAMABAAABAAAA" +
68     "AAAAAAEAAAAFAAAAAwAAAAAABwAEAAAAAQAAAAMADiAtIHRyYW5zZm9ybWVkAAIoSQACKVYAATwA" +
69     "Bjxpbml0PgACPjsAB0dvb2RieWUABUhlbGxvAAFJAAFMAAJMSQACTEwAC0xUcmFuc2Zvcm07AB1M" +
70     "ZGFsdmlrL2Fubm90YXRpb24vU2lnbmF0dXJlOwASTGphdmEvbGFuZy9PYmplY3Q7ABRMamF2YS9s" +
71     "YW5nL1J1bm5hYmxlOwASTGphdmEvbGFuZy9TdHJpbmc7ABlMamF2YS9sYW5nL1N0cmluZ0J1aWxk" +
72     "ZXI7ABxMamF2YS91dGlsL2Z1bmN0aW9uL0NvbnN1bWVyAB1MamF2YS91dGlsL2Z1bmN0aW9uL0Nv" +
73     "bnN1bWVyOwAOVHJhbnNmb3JtLmphdmEAAVYABFZJTEwAAlZMAAZhY2NlcHQABmFwcGVuZAASZW1p" +
74     "dHRlcjogamFjay00LjI0AANydW4ABXNheUhpAAh0b1N0cmluZwAFdmFsdWUAAgAHDgAEAwAAAAcO" +
75     "AR4PPDxdAR4PGS0AAgIBHhwHFwEXEhcDFxAXBRcPFwIAAAEBAICABMgDAQHgAwAAAA8AAAAAAAAA" +
76     "AQAAAAAAAAABAAAAHwAAAHAAAAACAAAACQAAAOwAAAADAAAABgAAABABAAAFAAAACQAAAFgBAAAG" +
77     "AAAAAQAAAKABAAADEAAAAQAAAMABAAABIAAAAgAAAMgBAAAGIAAAAQAAAJACAAABEAAABAAAAKgC" +
78     "AAACIAAAHwAAAMoCAAADIAAAAgAAAC8EAAAEIAAAAQAAAEcEAAAAIAAAAQAAAFsEAAAAEAAAAQAA" +
79     "AGwEAAA=");
80 
81   // A class that we can use to keep track of the output of this test.
82   private static class TestWatcher implements Consumer<String> {
83     private StringBuilder sb;
TestWatcher()84     public TestWatcher() {
85       sb = new StringBuilder();
86     }
87 
88     @Override
accept(String s)89     public void accept(String s) {
90       sb.append(s);
91       sb.append('\n');
92     }
93 
getOutput()94     public String getOutput() {
95       return sb.toString();
96     }
97 
clear()98     public void clear() {
99       sb = new StringBuilder();
100     }
101   }
102 
main(String[] args)103   public static void main(String[] args) {
104     doTest(new Transform());
105   }
106 
107   private static boolean retry = false;
108 
doTest(Transform t)109   public static void doTest(Transform t) {
110     final TestWatcher reporter = new TestWatcher();
111     Method say_hi_method;
112     // Figure out if we can even JIT at all.
113     final boolean has_jit = hasJit();
114     try {
115       say_hi_method = Transform.class.getDeclaredMethod(
116           "sayHi", int.class, Consumer.class, Runnable.class);
117     } catch (Exception e) {
118       System.out.println("Unable to find methods!");
119       e.printStackTrace(System.out);
120       return;
121     }
122     // Makes sure the stack is the way we want it for the test and does the redefinition. It will
123     // set the retry boolean to true if we need to go around again due to jit code being GCd.
124     Runnable do_redefinition = () -> {
125       if (has_jit && Main.isInterpretedFunction(say_hi_method, true)) {
126         // Try again. We are not running the right jitted methods/cannot redefine them now.
127         retry = true;
128       } else {
129         // Actually do the redefinition. The stack looks good.
130         retry = false;
131         reporter.accept("transforming calling function");
132         doCommonClassRedefinition(Transform.class, CLASS_BYTES, DEX_BYTES);
133       }
134     };
135     do {
136       // Run ensureJitCompiled here since it might get GCd
137       ensureJitCompiled(Transform.class, "sayHi");
138       // Clear output.
139       reporter.clear();
140       t.sayHi(2, reporter, () -> { reporter.accept("Not doing anything here"); });
141       t.sayHi(2, reporter, do_redefinition);
142       t.sayHi(2, reporter, () -> { reporter.accept("Not doing anything here"); });
143     } while(retry);
144     System.out.println(reporter.getOutput());
145   }
146 
hasJit()147   private static native boolean hasJit();
148 
isInterpretedFunction(Method m, boolean require_deoptimizable)149   private static native boolean isInterpretedFunction(Method m, boolean require_deoptimizable);
150 
ensureJitCompiled(Class c, String name)151   private static native void ensureJitCompiled(Class c, String name);
152 }
153