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 java.lang.invoke.MethodHandles;
  28 import java.lang.invoke.MethodType;
  29 import jdk.dynalink.CallSiteDescriptor;
  30 import jdk.dynalink.DynamicLinker;
  31 import jdk.dynalink.DynamicLinkerFactory;
  32 import jdk.dynalink.Operation;
  33 import jdk.dynalink.StandardNamespace;
  34 import jdk.dynalink.StandardOperation;
  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     private static final Operation GET_METHOD = StandardOperation.GET.withNamespace(StandardNamespace.METHOD);
  42     @Test
  43     public void testLinkedCallSiteLocation() throws Throwable {
  44         final StackTraceElement[] lastLinked = new StackTraceElement[1];
  45 
  46         final GuardingDynamicLinker testLinker =
  47                 (r, s) -> { lastLinked[0] = DynamicLinker.getLinkedCallSiteLocation(); return null; };
  48 
  49         final DynamicLinkerFactory factory = new DynamicLinkerFactory();
  50         factory.setPrioritizedLinker(testLinker);
  51         final DynamicLinker linker = factory.createLinker();
  52         final SimpleRelinkableCallSite callSite = new SimpleRelinkableCallSite(
  53                 new CallSiteDescriptor(
  54                         MethodHandles.lookup(),
  55                         GET_METHOD.named("foo"),
  56                         MethodType.methodType(void.class, Object.class)));
  57         linker.link(callSite);
  58 
  59         // Test initial linking
  60         callSite.dynamicInvoker().invoke(new TestClass1()); final int l1 = getLineNumber();
  61         assertLocation(lastLinked[0], l1);
  62 
  63         // Test relinking
  64         callSite.dynamicInvoker().invoke(new TestClass2()); final int l2 = getLineNumber();
  65         assertLocation(lastLinked[0], l2);
  66     }
  67 
  68     private void assertLocation(final StackTraceElement frame, final int lineNumber) {
  69         Assert.assertNotNull(frame);
  70         Assert.assertEquals(frame.getLineNumber(), lineNumber);
  71         Assert.assertEquals(frame.getClassName(), this.getClass().getName());
  72     }
  73 
  74     private static int getLineNumber() {
  75         return StackWalker.getInstance().walk(s -> s.skip(1).findFirst().get().getLineNumber());
  76     }
  77 
  78     public static class TestClass1 {
  79         public void foo() {
  80         }
  81     }
  82 
  83     public static class TestClass2 {
  84         public void foo() {
  85         }
  86     }
  87 }