1 /*
   2  * Copyright (c) 2020, Red Hat, Inc. 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 #include "precompiled.hpp"
  26 #include "gc_implementation/shenandoah/heuristics/shenandoahAdaptiveHeuristics.hpp"
  27 #include "gc_implementation/shenandoah/heuristics/shenandoahAggressiveHeuristics.hpp"
  28 #include "gc_implementation/shenandoah/heuristics/shenandoahCompactHeuristics.hpp"
  29 #include "gc_implementation/shenandoah/heuristics/shenandoahStaticHeuristics.hpp"
  30 #include "gc_implementation/shenandoah/mode/shenandoahIUMode.hpp"
  31 #include "gc_implementation/shenandoah/shenandoahLogging.hpp"
  32 
  33 void ShenandoahIUMode::initialize_flags() const {
  34   if (FLAG_IS_CMDLINE(ClassUnloadingWithConcurrentMark) && ClassUnloading) {
  35     log_warning(gc)("Shenandoah I-U mode sets -XX:-ClassUnloadingWithConcurrentMark; see JDK-8261341 for details");
  36   }
  37   FLAG_SET_DEFAULT(ClassUnloadingWithConcurrentMark, false);
  38 
  39   if (FLAG_IS_DEFAULT(ShenandoahStoreValEnqueueBarrier)) {
  40     FLAG_SET_DEFAULT(ShenandoahStoreValEnqueueBarrier, true);
  41   }
  42   if (FLAG_IS_DEFAULT(ShenandoahSATBBarrier)) {
  43     FLAG_SET_DEFAULT(ShenandoahSATBBarrier, false);
  44   }
  45 
  46   SHENANDOAH_ERGO_ENABLE_FLAG(ExplicitGCInvokesConcurrent);
  47   SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahImplicitGCInvokesConcurrent);
  48 
  49   // Final configuration checks
  50   SHENANDOAH_CHECK_FLAG_SET(ShenandoahLoadRefBarrier);
  51   SHENANDOAH_CHECK_FLAG_UNSET(ShenandoahSATBBarrier);
  52   SHENANDOAH_CHECK_FLAG_SET(ShenandoahStoreValEnqueueBarrier);
  53   SHENANDOAH_CHECK_FLAG_SET(ShenandoahCASBarrier);
  54   SHENANDOAH_CHECK_FLAG_SET(ShenandoahCloneBarrier);
  55 }
  56 
  57 ShenandoahHeuristics* ShenandoahIUMode::initialize_heuristics() const {
  58   if (ShenandoahGCHeuristics != NULL) {
  59     if (strcmp(ShenandoahGCHeuristics, "aggressive") == 0) {
  60       return new ShenandoahAggressiveHeuristics();
  61     } else if (strcmp(ShenandoahGCHeuristics, "static") == 0) {
  62       return new ShenandoahStaticHeuristics();
  63     } else if (strcmp(ShenandoahGCHeuristics, "adaptive") == 0) {
  64       return new ShenandoahAdaptiveHeuristics();
  65     } else if (strcmp(ShenandoahGCHeuristics, "compact") == 0) {
  66       return new ShenandoahCompactHeuristics();
  67     } else {
  68       vm_exit_during_initialization("Unknown -XX:ShenandoahGCHeuristics option");
  69     }
  70   }
  71   ShouldNotReachHere();
  72   return NULL;
  73 }