1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.dx.mockito.inline;
import android.os.Build;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.InvocationTargetException;
import java.security.ProtectionDomain;
import java.util.ArrayList;
import dalvik.system.BaseDexClassLoader;
/**
* Interface to the native jvmti agent in agent.cc
*/
class JvmtiAgent {
private static final String AGENT_LIB_NAME = "dexmakerjvmtiagent";
private static final Object lock = new Object();
/** Registered byte code transformers */
private final ArrayList<ClassTransformer> transformers = new ArrayList<>();
private native void nativeRegisterTransformerHook();
/**
* Enable jvmti and load agent.
*
* <p><b>If there are more than agent transforming classes the other agent might remove
* transformations added by this agent.</b>
*
* @throws IOException If jvmti could not be enabled or agent could not be loaded
*/
JvmtiAgent() throws IOException {
// TODO (moltmann@google.com): Replace with proper check for >= P
if (!Build.VERSION.CODENAME.equals("P")) {
throw new IOException("Requires Android P. Build is " + Build.VERSION.CODENAME);
}
Throwable loadJvmtiException = null;
ClassLoader cl = JvmtiAgent.class.getClassLoader();
if (!(cl instanceof BaseDexClassLoader)) {
throw new IOException("Could not load jvmti plugin as JvmtiAgent class was not loaded "
+ "by a BaseDexClassLoader");
}
// Currently Debug.attachJvmtiAgent requires a file in the right directory
File copiedAgent = File.createTempFile("agent", ".so");
copiedAgent.deleteOnExit();
try (InputStream is = new FileInputStream(
((BaseDexClassLoader) cl).findLibrary(AGENT_LIB_NAME))) {
try (OutputStream os = new FileOutputStream(copiedAgent)) {
byte[] buffer = new byte[64 * 1024];
while (true) {
int numRead = is.read(buffer);
if (numRead == -1) {
break;
}
os.write(buffer, 0, numRead);
}
}
}
try {
/*
* TODO (moltmann@google.com): Replace with regular method call once the API becomes
* public
*/
Class.forName("android.os.Debug").getMethod("attachJvmtiAgent", String.class,
String.class).invoke(null, copiedAgent.getAbsolutePath(), null);
} catch (InvocationTargetException e) {
loadJvmtiException = e.getCause();
} catch (IllegalAccessException | ClassNotFoundException | NoSuchMethodException e) {
loadJvmtiException = e;
}
if (loadJvmtiException != null) {
if (loadJvmtiException instanceof IOException) {
throw (IOException)loadJvmtiException;
} else {
throw new IOException("Could not load jvmti plugin",
loadJvmtiException);
}
}
nativeRegisterTransformerHook();
}
private native void nativeUnregisterTransformerHook();
@Override
protected void finalize() throws Throwable {
nativeUnregisterTransformerHook();
}
private native static void nativeAppendToBootstrapClassLoaderSearch(String absolutePath);
/**
* Append the jar to be bootstrap class load. This makes the classes in the jar behave as if
* they are loaded from the BCL. E.g. classes from java.lang can now call the classes in the
* jar.
*
* @param jarStream stream of jar to be added
*/
void appendToBootstrapClassLoaderSearch(InputStream jarStream) throws IOException {
File jarFile = File.createTempFile("mockito-boot", ".jar");
jarFile.deleteOnExit();
byte[] buffer = new byte[64 * 1024];
try (OutputStream os = new FileOutputStream(jarFile)) {
while (true) {
int numRead = jarStream.read(buffer);
if (numRead == -1) {
break;
}
os.write(buffer, 0, numRead);
}
}
nativeAppendToBootstrapClassLoaderSearch(jarFile.getAbsolutePath());
}
/**
* Ask the agent to trigger transformation of some classes. This will extract the byte code of
* the classes and the call back the {@link #addTransformer(ClassTransformer) transformers} for
* each individual class.
*
* @param classes The classes to transform
*
* @throws UnmodifiableClassException If one of the classes can not be transformed
*/
void requestTransformClasses(Class<?>[] classes) throws UnmodifiableClassException {
synchronized (lock) {
try {
nativeRetransformClasses(classes);
} catch (RuntimeException e) {
throw new UnmodifiableClassException(e);
}
}
}
/**
* Register a transformer. These are called for each class when a transformation was triggered
* via {@link #requestTransformClasses(Class[])}.
*
* @param transformer the transformer to add.
*/
void addTransformer(ClassTransformer transformer) {
transformers.add(transformer);
}
// called by JNI
@SuppressWarnings("unused")
public byte[] runTransformers(ClassLoader loader, String className,
Class<?> classBeingRedefined, ProtectionDomain protectionDomain,
byte[] classfileBuffer) throws IllegalClassFormatException {
byte[] transformedByteCode = classfileBuffer;
for (ClassTransformer transformer : transformers) {
transformedByteCode = transformer.transform(classBeingRedefined, transformedByteCode);
}
return transformedByteCode;
}
private native void nativeRetransformClasses(Class<?>[] classes);
}
|
