1 /*
   2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package jdk.dynalink.test;
  26 
  27 import static jdk.dynalink.StandardOperation.CALL_METHOD;
  28 
  29 import java.lang.invoke.MethodHandles;
  30 import java.lang.invoke.MethodType;
  31 import jdk.dynalink.CallSiteDescriptor;
  32 import jdk.dynalink.DynamicLinker;
  33 import jdk.dynalink.DynamicLinkerFactory;
  34 import jdk.dynalink.NamedOperation;
  35 import jdk.dynalink.linker.GuardingDynamicLinker;
  36 import jdk.dynalink.support.SimpleRelinkableCallSite;
  37 import org.testng.Assert;
  38 import org.testng.annotations.Test;
  39 
  40 public class LinkedCallSiteLocationTest {
  41     @Test
  42     public void testLinkedCallSiteLocation() throws Throwable {
  43         final StackTraceElement[] lastLinked = new StackTraceElement[1];
  44 
  45         final GuardingDynamicLinker testLinker =
  46                 (r, s) -> { lastLinked[0] = DynamicLinker.getLinkedCallSiteLocation(); return null; };
  47 
  48         final DynamicLinkerFactory factory = new DynamicLinkerFactory();
  49         factory.setPrioritizedLinker(testLinker);
  50         final DynamicLinker linker = factory.createLinker();
  51         final SimpleRelinkableCallSite callSite = new SimpleRelinkableCallSite(
  52                 new CallSiteDescriptor(
  53                         MethodHandles.lookup(),
  54                         new NamedOperation(CALL_METHOD, "foo"),
  55                         MethodType.methodType(void.class, Object.class)));
  56         linker.link(callSite);
  57 
  58         // Test initial linking
  59         callSite.dynamicInvoker().invoke(new TestClass1()); final int l1 = getLineNumber();
  60         assertLocation(lastLinked[0], l1);
  61 
  62         // Test relinking
  63         callSite.dynamicInvoker().invoke(new TestClass2()); final int l2 = getLineNumber();
  64         assertLocation(lastLinked[0], l2);
  65     }
  66 
  67     private void assertLocation(final StackTraceElement frame, final int lineNumber) {
  68         Assert.assertNotNull(frame);
  69         Assert.assertEquals(frame.getLineNumber(), lineNumber);
  70         Assert.assertEquals(frame.getClassName(), this.getClass().getName());
  71     }
  72 
  73     private static int getLineNumber() {
  74         return StackWalker.getInstance().walk(s -> s.skip(1).findFirst().get().getLineNumber());
  75     }
  76 
  77     public static class TestClass1 {
  78         public void foo() {
  79         }
  80     }
  81 
  82     public static class TestClass2 {
  83         public void foo() {
  84         }
  85     }
  86 }
--- EOF ---