NativeMethod.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
 * 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).
 *
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 * 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 8157892 8157977
 * @summary Verify file name, line number and bci of native methods
 * @run main NativeMethod
 */

import java.lang.StackWalker.Option;
import java.lang.StackWalker.StackFrame;
import java.lang.reflect.Method;
import java.util.List;
import java.util.stream.Collectors;

public class NativeMethod {
    public static void main(String... args) throws Exception {
        new NativeMethod().test();
    }

    private final StackWalker walker;
    NativeMethod() {
        this.walker = StackWalker.getInstance(Option.SHOW_REFLECT_FRAMES);
    }

    void test() throws Exception {
        // invoke via reflection that includes native methods
        Method m = NativeMethod.class.getDeclaredMethod("walk");
        m.invoke(this);
    }

    void walk() {
        List<StackFrame> nativeFrames = walker.walk(s ->
            s.filter(StackFrame::isNativeMethod)
             .collect(Collectors.toList())
        );

        assertTrue(nativeFrames.size() > 0, "native frame not found");
        for (StackFrame f : nativeFrames) {
            assertTrue(f.getFileName() != null, "source file expected to be found");
            assertTrue(f.getLineNumber() < 0, "line number expected to be unavailable");
            assertTrue(f.getByteCodeIndex() < 0, "bci expected to be unavailable");
        }

    }

    private static void assertTrue(boolean value, String msg) {
        if (value != true)
            throw new AssertionError(msg);
    }
}