[LLVMdev] vmkit java annotations

[Alexandru Ionut Diaconescu]

Hello everyone,

I am able to work very well with annotations in C/C++, by using
__attribute__((annotate("MYANNOTATION"))) static int a; . Inside the LLVM
bytecode I have @llvm.global.annotations and @llvm.var.annotation.

However, I was trying to test annotations also in Java, with VMKit. These
are the commands that I run:

javac -Xlint -g -O Main.java
../Release+Asserts/bin/vmjc Main
../Release+Asserts/bin/j3 Main
../../llvm_new/Release+Asserts/bin/llvm-dis < Main.bc > Main_assembly

My small program is :

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.reflect.Method;

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@interface Red {
    String info() default "";
}


class Annotated {
    @Red(info = "AWESOME")
    public void foo(String myParam) {
        System.out.println("This is " + myParam);
    }
}


class TestAnnotationParser {
    public void parse(Class clazz) throws Exception {
        Method[] methods = clazz.getMethods();



    for (Method method : methods) {
        if (method.isAnnotationPresent(Red.class)) {
            Red test = method.getAnnotation(Red.class);
            String info = test.info();

            if ("AWESOME".equals(info)) {
                 System.out.println("info is awesome!");
                 // try to invoke the method with param
                 method.invoke(
                    Annotated.class.newInstance(),
                    info
                 );
            }
        }
    }
}


}


public class Main {
    public static void main(String[] args) throws Exception {
        TestAnnotationParser parser = new TestAnnotationParser();
        parser.parse(Annotated.class);
    }
}


However, I cannot find the annotations in the bytecode. It is something
that I did wrong?

Thank you in advance !
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