在ASM中,可以通过以下步骤找到ALOAD指令中加载的对象的类型:
class AloadClassVisitor extends ClassVisitor {
public AloadClassVisitor(ClassVisitor cv) {
super(ASM7, cv);
}
@Override
public MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {
MethodVisitor mv = super.visitMethod(access, name, descriptor, signature, exceptions);
// 在方法中插入代码
return new AloadMethodVisitor(mv);
}
}
class AloadMethodVisitor extends MethodVisitor {
public AloadMethodVisitor(MethodVisitor mv) {
super(ASM7, mv);
}
@Override
public void visitVarInsn(int opcode, int var) {
if (opcode == ALOAD) {
System.out.println("ALOAD " + var);
// 获取局部变量表中的加载对象的类型
super.visitVarInsn(ALOAD, var);
super.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "getClass", "()Ljava/lang/Class;", false);
super.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Class", "getName", "()Ljava/lang/String;", false);
super.visitLdcInsn("ALOAD Type: ");
super.visitInsn(CONCAT);
super.visitMethodInsn(INVOKESTATIC, "java/lang/String", "valueOf", "(Ljava/lang/Object;)Ljava/lang/String;", false);
super.visitMethodInsn(INVOKESTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;", false);
super.visitInsn(SWAP);
super.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V", false);
}
super.visitVarInsn(opcode, var);
}
}
public static void main(String[] args) throws IOException {
ClassReader cr = new ClassReader("YourClass");
ClassWriter cw = new ClassWriter(cr, ClassWriter.COMPUTE_MAXS);
ClassVisitor cv = new AloadClassVisitor(cw);
cr.accept(cv, ClassReader.EXPAND_FRAMES);
byte[] transformed = cw.toByteArray();
// 将转换后的字节码写回到类文件
try (FileOutputStream fos = new FileOutputStream("YourClass.class")) {
fos.write(transformed);
} catch (IOException e) {
e.printStackTrace();
}
}
以上代码会在每个ALOAD指令处输出加载对象的类型。你可以根据自己的需要进行进一步处理,比如将类型存储到List中进行分析。