bytecode

I am attempting to use the Java byte code engineering library ASM to perform static analysis. I have the situation where I would like to inspect the variables being assigned to a field. I have MethodVisitor which implements the visitFieldInsn() method. I am specifically looking for the putfield command. That is no problem. The problem is that when I encounter putfield , I want to be able to access the variable that's going to be assigned to the field. Specifically I want to access information about the type of the variable. At the moment I really only need to look at what's at the top of the

Goal Detecting where comparisons between and copies of variables are made Inject code near the line where the operation has happened The purpose of the code: everytime the class is ran make a counter increase General purpose: count the amount of comparisons and copies made after execution with certain parameters 2 options Note: I always have a .java file to begin with 1) Edit java file Find comparisons with regex and inject pieces of code near the line And then compile the class (My application uses JavaCompiler) 2)Use ASM Bytecode engineering Also detecting where the events i want to track

I have calculated the average cyclomatic complexity for each of my class files. I was wondering how I could measure the number of bytecode instructions in each of my class files using Eclipse perhaps? I don't know if you can do that easily from Eclipse, but you can use javap -c to get a disassembly of your class files. Shouldn't be too hard to wrap that in a script if you only care about the number of instructions per method. Example: $ javap -c Test Compiled from "Test.java" public class Test extends java.lang.Object{ public Test(); Code: 0: aload_0 1: invokespecial #1; //Method java/lang

What's the difference between java bytecode astore_1 and astore_2 ? The instructions astore_n , for small values of n , are just shorthand equivalents for astore n . Either version stores what's on top of the stack into local variable n . astore_1 is the same as astore 1 , and astore_2 is the same as astore 2 , except that astore_1 and astore_2 are one byte each, whereas astore is a two-byte instruction. 来源： https://stackoverflow.com/questions/6983641/whats-the-difference-between-java-bytecode-astore-1-and-astore-2

Is it possible to use Byte Buddy to redefine a private method of a class? It seems that the entry point into using Byte Buddy is always sub-classing an existing class. When doing this, it is obviously not possible to redefine a private method of the parent class (at least not in a way that the redefined method is used in the parent class). Consider the following example: public class Foo { public void sayHello() { System.out.println(getHello()); } private String getHello() { return "Hello World!"; } } Foo foo = new ByteBuddy() .subclass(Foo.class) .method(named("getHello")).intercept