test/langtools/tools/javac/defaultMethods/BadClassfile.java

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/*
 * @test
 * @bug 8025087
 * @summary Verify that pre-JDK8 classfiles with default and/or static methods
 *          are refused correctly.
 * @modules jdk.compiler/com.sun.tools.javac.api
 *          jdk.compiler/com.sun.tools.javac.code
 *          jdk.compiler/com.sun.tools.javac.comp
 *          jdk.compiler/com.sun.tools.javac.jvm
 *          jdk.compiler/com.sun.tools.javac.main
 *          jdk.compiler/com.sun.tools.javac.util
 * @build BadClassfile
 * @run main BadClassfile
 */

import java.lang.classfile.*;
import com.sun.tools.javac.api.JavacTaskImpl;
import com.sun.tools.javac.code.ClassFinder.BadClassFile;
import com.sun.tools.javac.code.Symbol;
import com.sun.tools.javac.code.Symtab;
import com.sun.tools.javac.jvm.Target;
import com.sun.tools.javac.util.Assert;
import com.sun.tools.javac.util.JCDiagnostic;
import java.io.File;
import java.util.Arrays;
import java.util.Objects;
import javax.tools.JavaCompiler;
import javax.tools.ToolProvider;

public class BadClassfile {
    public static void main(String... args) throws Exception {
        test("BadClassfile$DefaultMethodTest", "compiler.misc.invalid.default.interface");
        test("BadClassfile$StaticMethodTest", "compiler.misc.invalid.static.interface");
    }

    private static void test(String classname, String expected) throws Exception {
        File classfile = new File(System.getProperty("test.classes", "."), classname + ".class");
        ClassModel cf = ClassFile.of().parse(classfile.toPath());
        ClassFile.of().transformClass(cf, ClassTransform.dropping(ce -> ce instanceof ClassFileVersion)
                .andThen(ClassTransform.endHandler(classBuilder -> classBuilder.withVersion(Target.JDK1_7.majorVersion, Target.JDK1_7.minorVersion))));
        JavaCompiler c = ToolProvider.getSystemJavaCompiler();
        JavacTaskImpl task = (JavacTaskImpl) c.getTask(null, null, null, Arrays.asList("-classpath", System.getProperty("test.classes", ".")), null, null);
        Symtab syms = Symtab.instance(task.getContext());

        task.ensureEntered();

        try {
            Symbol clazz = com.sun.tools.javac.main.JavaCompiler.instance(task.getContext()).resolveIdent(syms.unnamedModule, classname);

            clazz.complete();
        } catch (BadClassFile f) {
            JCDiagnostic embeddedDiag = (JCDiagnostic) f.getDiagnostic().getArgs()[1];
            assertEquals(expected, embeddedDiag.getCode());
            assertEquals(Integer.toString(Target.JDK1_7.majorVersion), embeddedDiag.getArgs()[0]);
            assertEquals(Integer.toString(Target.JDK1_7.minorVersion), embeddedDiag.getArgs()[1]);
        }
    }

    private static void assertEquals(Object expected, Object actual) {
        Assert.check(Objects.equals(expected, actual),
                     "expected: " + expected + ", but was: " + actual);
    }

    interface DefaultMethodTest {
        default void test() { }
    }
    interface StaticMethodTest {
        static void test() { }
    }
}