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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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/*
 * @test
 * @bug 8031744
 * @summary test that the right thing happens when we compile java/lang/annotation/Target.java
 * @library /tools/javac/lib
 * @build JavacTestingAbstractProcessor TestCompileMetaAnnotations
 * @compile -processor TestCompileMetaAnnotations -proc:only -implicit:class ../java/lang/annotation/Target.java
 */

import com.sun.tools.javac.code.Attribute;
import com.sun.tools.javac.code.Symbol;
import com.sun.tools.javac.code.Symbol.ClassSymbol;
import com.sun.tools.javac.code.Symtab;
import com.sun.tools.javac.code.Type;
import com.sun.tools.javac.processing.JavacProcessingEnvironment;
import com.sun.tools.javac.util.Assert;
import com.sun.tools.javac.util.Context;

import java.util.*;
import javax.annotation.processing.*;
import javax.lang.model.element.*;

@SupportedAnnotationTypes({"java.lang.annotation.Target"})
public class TestCompileMetaAnnotations extends JavacTestingAbstractProcessor {
    private int round = 0;

    @Override
    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
        if (round > 0) return false;

        JavacProcessingEnvironment env = (JavacProcessingEnvironment)processingEnv;
        Context ctx = env.getContext();
        Symtab tab = Symtab.instance(ctx);

        // game on!
        Set<? extends Element> elements = roundEnv.getElementsAnnotatedWith(java.lang.annotation.Target.class);
        Assert.check(elements.size() == 1);

        Type predefTargetType = tab.annotationTargetType;
        ClassSymbol predefTarget = (ClassSymbol)predefTargetType.tsym;

        ClassSymbol currentlyCompiling = (ClassSymbol)elements.toArray()[0];
        Type currentyCompilingType = currentlyCompiling.type;

        Attribute.Compound usingPredef = currentlyCompiling.attribute(predefTarget);
        Attribute.Compound usingCurrently = currentlyCompiling.attribute(currentlyCompiling);

        System.err.println("Predef: " + printSymbol(predefTarget));
        System.err.println("Compiling: " + printSymbol(currentlyCompiling));
        System.err.println("Using predef: " + usingPredef + " declared: " + printSymbol(usingPredef.type.tsym));
        System.err.println("Using currently: " + usingCurrently + " declared: " + printSymbol(usingCurrently.type.tsym));

        // Check that the predefined Symbol for @Target matches the Symbol we are currently compiling
        // and matches the tsym for the @Target... annotation on the declaration of
        // java.lang.annotation.Target
        Assert.check(predefTarget == currentlyCompiling);
        Assert.check(currentlyCompiling == usingPredef.type.tsym);
        Assert.check(usingPredef.type.tsym == usingCurrently.type.tsym);

        Assert.check(predefTargetType == currentyCompilingType);

        Assert.checkNonNull(predefTarget.sourcefile);

        round++;
        return true;
    }

    private String printSymbol(Symbol s) {
        return  s.getClass().getName() + "@0x" + Integer.toHexString(s.hashCode());
    }
}