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/*

 * @test

 * @bug 8038455

 * @summary Ensure that Symbols for members (methods and fields) are dropped across annotation

 *          processing rounds. ClassSymbols need to be kept.

 * @library /tools/javac/lib

 * @build JavacTestingAbstractProcessor MethodsDroppedBetweenRounds

 * @compile/process -processor MethodsDroppedBetweenRounds MethodsDroppedBetweenRounds.java

 */

import java.lang.ref.WeakReference;

import java.util.*;

import javax.annotation.processing.*;

import javax.lang.model.element.*;

import javax.lang.model.util.ElementFilter;

public class MethodsDroppedBetweenRounds extends JavacTestingAbstractProcessor {

    private static TypeElement currentClassSymbol;

    private static WeakReference<ExecutableElement> keptMethod = null;

    public boolean process(Set<? extends TypeElement> annos,RoundEnvironment rEnv) {

        if (keptMethod != null) {

            //force GC:

            List<byte[]> hold = new ArrayList<>();

            try {

                while (true)

                    hold.add(new byte[1024 * 1024 * 1024]);

            } catch (OutOfMemoryError err) { }

            hold.clear();

            if (keptMethod.get() != null) {

                throw new IllegalStateException("Holds method across rounds.");

            }

        }

        TypeElement currentClass = elements.getTypeElement("MethodsDroppedBetweenRounds");

        if (currentClassSymbol != null && currentClassSymbol != currentClass) {

            throw new IllegalStateException("Different ClassSymbols across rounds");

        }

        ExecutableElement method = ElementFilter.methodsIn(currentClass.getEnclosedElements()).get(0);

        keptMethod = new WeakReference<>(method);

        return true;

    }

}