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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
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  23 
  24 /*
  25  * @test
  26  * @bug 8147039
  27  * @summary Confirm locals[] always has expected length, even for "dead" locals
  28  * @compile LocalsAndOperands.java
  29  * @run testng/othervm -Xcomp CountLocalSlots
  30  */
  31 
  32 import org.testng.annotations.Test;
  33 import java.lang.StackWalker.StackFrame;
  34 
  35 public class CountLocalSlots {
  36     final static boolean debug = true;
  37 
  38     @Test(dataProvider = "provider", dataProviderClass = LocalsAndOperands.class)
  39     public void countLocalSlots(StackFrame... frames) {
  40         for (StackFrame frame : frames) {
  41             if (debug) {
  42                 System.out.println("Running countLocalSlots");
  43                 LocalsAndOperands.dumpStackWithLocals(frames);
  44             }
  45             // Confirm expected number of locals
  46             String methodName = frame.getMethodName();
  47             Integer expectedObj = (Integer) LocalsAndOperands.Tester.NUM_LOCALS.get(methodName);
  48             if (expectedObj == null) {
  49                 if (!debug) { LocalsAndOperands.dumpStackWithLocals(frames); }
  50                 throw new RuntimeException("No NUM_LOCALS entry for " +
  51                         methodName + "().  Update test?");
  52             }
  53             Object[] locals = (Object[]) LocalsAndOperands.invokeGetLocals(frame);
  54             if (locals.length != expectedObj) {
  55                 if (!debug) { LocalsAndOperands.dumpStackWithLocals(frames); }
  56                 throw new RuntimeException(methodName + "(): number of locals (" +
  57                         locals.length + ") did not match expected (" + expectedObj + ")");
  58             }
  59         }
  60     }
  61 }