[LLVMdev] vmkit java annotations

[Harris BAKIRAS]

Hello Alexandru,

No you did nothing wrong.

We are using our own data structure to describe annotations in J3. So it 
is normal that you can not see your Java annotations inside the LLVM 
bytecode produced.
If I remember well, our implementation of annotations do not rely on 
LLVM annotations.

Regards,

Harris Bakiras

On 06/17/2013 02:19 PM, Alexandru Ionut Diaconescu wrote:
> 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 <http://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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