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
191
192
193
|
/*
* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package asmlib;
import java.io.PrintStream;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.atomic.AtomicInteger;
import jdk.internal.org.objectweb.asm.ClassReader;
import jdk.internal.org.objectweb.asm.ClassVisitor;
import jdk.internal.org.objectweb.asm.ClassWriter;
import jdk.internal.org.objectweb.asm.MethodVisitor;
import jdk.internal.org.objectweb.asm.Opcodes;
import java.util.function.Consumer;
import jdk.internal.org.objectweb.asm.Type;
public class Instrumentor {
public static class InstrHelper {
private final MethodVisitor mv;
private final String name;
InstrHelper(MethodVisitor mv, String name) {
this.mv = mv;
this.name = name;
}
public String getName() {
return this.name;
}
public void invokeStatic(String owner, String name, String desc, boolean itf) {
mv.visitMethodInsn(Opcodes.INVOKESTATIC, owner, name, desc, itf);
}
public void invokeSpecial(String owner, String name, String desc) {
mv.visitMethodInsn(Opcodes.INVOKESPECIAL, owner, name, desc, false);
}
public void invokeVirtual(String owner, String name, String desc) {
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, owner, name, desc, false);
}
public void push(int val) {
if (val >= -1 && val <= 5) {
mv.visitInsn(Opcodes.ICONST_0 + val);
} else if (val >= Byte.MIN_VALUE && val <= Byte.MAX_VALUE) {
mv.visitIntInsn(Opcodes.BIPUSH, val);
} else if (val >= Short.MIN_VALUE && val <= Short.MAX_VALUE) {
mv.visitIntInsn(Opcodes.SIPUSH, val);
} else {
mv.visitLdcInsn(val);
}
}
public void push(Object val) {
mv.visitLdcInsn(val);
}
public void println(String s) {
mv.visitFieldInsn(Opcodes.GETSTATIC, Type.getInternalName(System.class), "out", Type.getDescriptor(PrintStream.class));
mv.visitLdcInsn(s);
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(PrintStream.class), "println", Type.getMethodDescriptor(Type.VOID_TYPE, Type.getType(String.class)), false);
}
}
public static Instrumentor instrFor(byte[] classData) {
return new Instrumentor(classData);
}
private final ClassReader cr;
private final ClassWriter output;
private ClassVisitor instrumentingVisitor = null;
private final AtomicInteger matches = new AtomicInteger(0);
private Instrumentor(byte[] classData) {
cr = new ClassReader(classData);
output = new ClassWriter(ClassWriter.COMPUTE_MAXS);
instrumentingVisitor = output;
}
public synchronized Instrumentor addMethodEntryInjection(String methodName, Consumer<InstrHelper> injector) {
instrumentingVisitor = new ClassVisitor(Opcodes.ASM5, instrumentingVisitor) {
@Override
public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
MethodVisitor mv = super.visitMethod(access, name, desc, signature, exceptions);
if (name.equals(methodName)) {
matches.getAndIncrement();
mv = new MethodVisitor(Opcodes.ASM5, mv) {
@Override
public void visitCode() {
injector.accept(new InstrHelper(mv, name));
}
};
}
return mv;
}
};
return this;
}
public synchronized Instrumentor addNativeMethodTrackingInjection(String prefix, Consumer<InstrHelper> injector) {
instrumentingVisitor = new ClassVisitor(Opcodes.ASM5, instrumentingVisitor) {
private final Set<Consumer<ClassVisitor>> wmGenerators = new HashSet<>();
private String className;
@Override
public void visit(int version, int access, String name, String signature, String superName, String[] interfaces) {
this.className = name;
super.visit(version, access, name, signature, superName, interfaces);
}
@Override
public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
if ((access & Opcodes.ACC_NATIVE) != 0) {
matches.getAndIncrement();
String newName = prefix + name;
wmGenerators.add((v)->{
MethodVisitor mv = v.visitMethod(access & ~Opcodes.ACC_NATIVE, name, desc, signature, exceptions);
mv.visitCode();
injector.accept(new InstrHelper(mv, name));
Type[] argTypes = Type.getArgumentTypes(desc);
Type retType = Type.getReturnType(desc);
boolean isStatic = (access & Opcodes.ACC_STATIC) != 0;
if (!isStatic) {
mv.visitIntInsn(Opcodes.ALOAD, 0); // load "this"
}
// load the method parameters
if (argTypes.length > 0) {
int ptr = isStatic ? 0 : 1;
for(Type argType : argTypes) {
mv.visitIntInsn(argType.getOpcode(Opcodes.ILOAD), ptr);
ptr += argType.getSize();
}
}
mv.visitMethodInsn(isStatic ? Opcodes.INVOKESTATIC : Opcodes.INVOKESPECIAL, className, newName, desc, false);
mv.visitInsn(retType.getOpcode(Opcodes.IRETURN));
mv.visitMaxs(1, 1); // dummy call; let ClassWriter to deal with this
mv.visitEnd();
});
return super.visitMethod(access, newName, desc, signature, exceptions);
}
return super.visitMethod(access, name, desc, signature, exceptions);
}
@Override
public void visitEnd() {
wmGenerators.stream().forEach((e) -> {
e.accept(cv);
});
super.visitEnd();
}
};
return this;
}
public synchronized byte[] apply() {
cr.accept(instrumentingVisitor, ClassReader.SKIP_DEBUG + ClassReader.EXPAND_FRAMES);
return matches.get() == 0 ? null : output.toByteArray();
}
}
|
