1 /*
   2  * Copyright (c) 2013, 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
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test IsMethodCompilableTest
  26  * @bug 8007270
  27  * @library /testlibrary /testlibrary/whitebox
  28  * @build IsMethodCompilableTest
  29  * @run main ClassFileInstaller sun.hotspot.WhiteBox
  30  * @run main/othervm/timeout=600 -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI IsMethodCompilableTest
  31  * @author igor.ignatyev@oracle.com
  32  */
  33 public class IsMethodCompilableTest extends CompilerWhiteBoxTest {
  34     protected static final long PER_METHOD_RECOMPILATION_CUTOFF;
  35 
  36     static {
  37         long tmp = Long.parseLong(
  38                 getVMOption("PerMethodRecompilationCutoff", "400"));
  39         if (tmp == -1) {
  40             PER_METHOD_RECOMPILATION_CUTOFF = -1 /* Inf */;
  41         } else {
  42             PER_METHOD_RECOMPILATION_CUTOFF = 1 + (0xFFFFFFFFL & tmp);
  43         }
  44     }
  45 
  46     public static void main(String[] args) throws Exception {
  47         // to prevent inlining #method into #compile()
  48         WHITE_BOX.setDontInlineMethod(METHOD, true);
  49         new IsMethodCompilableTest().runTest();
  50     }
  51 
  52     protected void test() throws Exception {
  53         if (!WHITE_BOX.isMethodCompilable(METHOD)) {
  54             throw new RuntimeException(METHOD + " must be compilable");
  55         }
  56         System.out.println("PerMethodRecompilationCutoff = "
  57                 + PER_METHOD_RECOMPILATION_CUTOFF);
  58         if (PER_METHOD_RECOMPILATION_CUTOFF == -1) {
  59             System.err.println(
  60                     "Warning: test is not applicable if PerMethodRecompilationCutoff == Inf");
  61             return;
  62         }
  63 
  64         // deoptimze 'PerMethodRecompilationCutoff' times and clear state
  65         for (long i = 0L, n = PER_METHOD_RECOMPILATION_CUTOFF - 1; i < n; ++i) {
  66             compileAndDeoptimaze();
  67         }
  68         if (!WHITE_BOX.isMethodCompilable(METHOD)) {
  69             throw new RuntimeException(METHOD + " is not compilable after "
  70                     + (PER_METHOD_RECOMPILATION_CUTOFF - 1) + " iterations");
  71         }
  72         WHITE_BOX.clearMethodState(METHOD);
  73 
  74         // deoptimze 'PerMethodRecompilationCutoff' + 1 times
  75         long i;
  76         for (i = 0L; i < PER_METHOD_RECOMPILATION_CUTOFF
  77                 && WHITE_BOX.isMethodCompilable(METHOD); ++i) {
  78             compileAndDeoptimaze();
  79         }
  80         if (i != PER_METHOD_RECOMPILATION_CUTOFF) {
  81            throw new RuntimeException(METHOD + " is not compilable after "
  82                    + i + " iterations, but must only after "
  83                    + PER_METHOD_RECOMPILATION_CUTOFF);
  84         }
  85         if (WHITE_BOX.isMethodCompilable(METHOD)) {
  86             throw new RuntimeException(METHOD + " is still compilable after "
  87                     + PER_METHOD_RECOMPILATION_CUTOFF + " iterations");
  88         }
  89         compile();
  90         checkNotCompiled(METHOD);
  91 
  92         WHITE_BOX.clearMethodState(METHOD);
  93         if (!WHITE_BOX.isMethodCompilable(METHOD)) {
  94             throw new RuntimeException(METHOD
  95                     + " is compilable after clearMethodState()");
  96         }
  97         compile();
  98         checkCompiled(METHOD);
  99     }
 100 
 101     private void compileAndDeoptimaze() throws Exception {
 102         compile();
 103         waitBackgroundCompilation(METHOD);
 104         WHITE_BOX.deoptimizeMethod(METHOD);
 105     }
 106 }