我试图获取Java程序方法参数的值。我使用ASM来操纵字节码并获取这些值。不过,我遇到了一些问题。
下面是用于操作代码的 visitCode() 方法,它所做的是:
1.创建一个空数组来存储收集的参数。 2.为每个参数加载其值到数组中。 3.将此数组发送到我的代理的 OnMethodEntry 方法(其中将使用这些值)。
下面是用于操作代码的 visitCode() 方法,它所做的是:
1.创建一个空数组来存储收集的参数。 2.为每个参数加载其值到数组中。 3.将此数组发送到我的代理的 OnMethodEntry 方法(其中将使用这些值)。
@Override
public void visitCode() {
int paramLength = paramTypes.length;
// Create array with length equal to number of parameters
mv.visitIntInsn(Opcodes.BIPUSH, paramLength);
mv.visitTypeInsn(Opcodes.ANEWARRAY, "java/lang/Object");
mv.visitVarInsn(Opcodes.ASTORE, paramLength);
// Fill the created array with method parameters
int i = 0;
for (Type tp : paramTypes) {
mv.visitVarInsn(Opcodes.ALOAD, paramLength);
mv.visitIntInsn(Opcodes.BIPUSH, i);
if (tp.equals(Type.BOOLEAN_TYPE) || tp.equals(Type.BYTE_TYPE) || tp.equals(Type.CHAR_TYPE) || tp.equals(Type.SHORT_TYPE) || tp.equals(Type.INT_TYPE))
mv.visitVarInsn(Opcodes.ILOAD, i);
else if (tp.equals(Type.LONG_TYPE)) {
mv.visitVarInsn(Opcodes.LLOAD, i);
i++;
}
else if (tp.equals(Type.FLOAT_TYPE))
mv.visitVarInsn(Opcodes.FLOAD, i);
else if (tp.equals(Type.DOUBLE_TYPE)) {
mv.visitVarInsn(Opcodes.DLOAD, i);
i++;
}
else
mv.visitVarInsn(Opcodes.ALOAD, i);
mv.visitInsn(Opcodes.AASTORE);
i++;
}
// Load id, class name and method name
this.visitLdcInsn(new Integer(this.methodID));
this.visitLdcInsn(this.className);
this.visitLdcInsn(this.methodName);
// Load the array of parameters that we created
this.visitVarInsn(Opcodes.ALOAD, paramLength);
mv.visitMethodInsn(Opcodes.INVOKESTATIC,
"jalen/MethodStats",
"onMethodEntry",
"(ILjava/lang/String;Ljava/lang/String;[Ljava/lang/Object;)V");
super.visitCode();
}
但是,当方法有多个参数时,这种方法不起作用。
获取的类文件显示如下内容:
static void moveDisk(char arg0, char arg1, PrintStream arg2) {
Object[] arrayOfObject = new Object[3]; arrayOfObject[0] = ???; arrayOfObject[1] = ???;
Object localObject;
arrayOfObject[2] = localObject; MethodStats.onMethodEntry(5, "hanoi/TowersOfHanoi", "moveDisk", arrayOfObject);
创建了2个本地对象而不是加载参数。
字节码没有显示任何奇怪的东西:
static void moveDisk(char, char, java.io.PrintStream);
Code:
0: bipush 3
2: anewarray #4 // class java/lang/Object
5: astore_3
6: aload_3
7: bipush 0
9: iload_0
10: aastore
11: aload_3
12: bipush 1
14: iload_1
15: aastore
16: aload_3
17: bipush 2
19: aload_2
20: aastore
21: ldc #118 // int 5
23: ldc #12 // String hanoi/TowersOfHanoi
25: ldc #119 // String moveDisk
27: aload_3
28: invokestatic #19 // Method jalen/MethodStats.onMethodEntry:(ILjava/lang/String;Ljava/lang/String;[Ljava/lang/Object;)V
最后,当使用-noverify选项时,显示的错误信息如下:
param: [Ljava.lang.String;@420e54f3
Exception in thread "Jalen Agent" java.lang.NullPointerException
at hanoi.TowersOfHanoi.solveHanoi(TowersOfHanoi.java)
at hanoi.TowersOfHanoi.main(TowersOfHanoi.java:29)
否则,它就是:Exception in thread "Jalen Agent" java.lang.VerifyError: (class: hanoi/TowersOfHanoi, method: moveDisk signature: (CCLjava/io/PrintStream;)V) Expecting to find object/array on stack
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2442)
at java.lang.Class.getMethod0(Class.java:2685)
at java.lang.Class.getMethod(Class.java:1620)
at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:492)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:484)
通常情况下,这应该能够正常工作,因为我只是从栈帧中加载信息。我还尝试检查静态和非静态方法(如此处解释的堆栈:http://www.artima.com/insidejvm/ed2/jvm8.html),但仍然没有成功。
有任何关于为什么会发生这种情况的想法,或者可能的解决方案吗?
谢谢 :)
编辑:
当装箱原始类型时它现在可以工作了(感谢下面int3的建议 :) )。这里是visitCode()方法的工作代码:
@Override
public void visitCode() {
int paramLength = paramTypes.length;
// Create array with length equal to number of parameters
mv.visitIntInsn(Opcodes.BIPUSH, paramLength);
mv.visitTypeInsn(Opcodes.ANEWARRAY, "java/lang/Object");
mv.visitVarInsn(Opcodes.ASTORE, paramLength);
// Fill the created array with method parameters
int i = 0;
for (Type tp : paramTypes) {
mv.visitVarInsn(Opcodes.ALOAD, paramLength);
mv.visitIntInsn(Opcodes.BIPUSH, i);
if (tp.equals(Type.BOOLEAN_TYPE)) {
mv.visitVarInsn(Opcodes.ILOAD, i);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Boolean", "valueOf", "(Z)Ljava/lang/Boolean;");
}
else if (tp.equals(Type.BYTE_TYPE)) {
mv.visitVarInsn(Opcodes.ILOAD, i);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Byte", "valueOf", "(B)Ljava/lang/Byte;");
}
else if (tp.equals(Type.CHAR_TYPE)) {
mv.visitVarInsn(Opcodes.ILOAD, i);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Character", "valueOf", "(C)Ljava/lang/Character;");
}
else if (tp.equals(Type.SHORT_TYPE)) {
mv.visitVarInsn(Opcodes.ILOAD, i);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Short", "valueOf", "(S)Ljava/lang/Short;");
}
else if (tp.equals(Type.INT_TYPE)) {
mv.visitVarInsn(Opcodes.ILOAD, i);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Integer", "valueOf", "(I)Ljava/lang/Integer;");
}
else if (tp.equals(Type.LONG_TYPE)) {
mv.visitVarInsn(Opcodes.LLOAD, i);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Long", "valueOf", "(J)Ljava/lang/Long;");
i++;
}
else if (tp.equals(Type.FLOAT_TYPE)) {
mv.visitVarInsn(Opcodes.FLOAD, i);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Float", "valueOf", "(F)Ljava/lang/Float;");
}
else if (tp.equals(Type.DOUBLE_TYPE)) {
mv.visitVarInsn(Opcodes.DLOAD, i);
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/Double", "valueOf", "(D)Ljava/lang/Double;");
i++;
}
else
mv.visitVarInsn(Opcodes.ALOAD, i);
mv.visitInsn(Opcodes.AASTORE);
i++;
}
// Load id, class name and method name
this.visitLdcInsn(new Integer(this.methodID));
this.visitLdcInsn(this.className);
this.visitLdcInsn(this.methodName);
// Load the array of parameters that we created
this.visitVarInsn(Opcodes.ALOAD, paramLength);
mv.visitMethodInsn(Opcodes.INVOKESTATIC,
"jalen/MethodStats",
"onMethodEntry",
"(ILjava/lang/String;Ljava/lang/String;[Ljava/lang/Object;)V");
super.visitCode();
}