1 /*
   2  * Copyright (c) 2018, 2019, 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 #include "precompiled.hpp"
  25 #include "gc/z/zBarrierSet.hpp"
  26 #include "gc/z/zBarrierSetAssembler.hpp"
  27 #include "gc/z/zBarrierSetNMethod.hpp"
  28 #include "gc/z/zGlobals.hpp"
  29 #include "gc/z/zHeap.inline.hpp"
  30 #include "gc/z/zThreadLocalData.hpp"
  31 #include "runtime/thread.hpp"
  32 #include "utilities/macros.hpp"
  33 #ifdef COMPILER1
  34 #include "gc/z/c1/zBarrierSetC1.hpp"
  35 #endif
  36 #ifdef COMPILER2
  37 #include "gc/z/c2/zBarrierSetC2.hpp"
  38 #endif
  39 
  40 class ZBarrierSetC1;
  41 class ZBarrierSetC2;
  42 
  43 static BarrierSetNMethod* make_barrier_set_nmethod() {
  44   // NMethod barriers are only used when class unloading is enabled
  45   if (!ClassUnloading) {
  46     return NULL;
  47   }
  48 
  49   return new ZBarrierSetNMethod();
  50 }
  51 
  52 ZBarrierSet::ZBarrierSet() :
  53     BarrierSet(make_barrier_set_assembler<ZBarrierSetAssembler>(),
  54                make_barrier_set_c1<ZBarrierSetC1>(),
  55                make_barrier_set_c2<ZBarrierSetC2>(),
  56                make_barrier_set_nmethod(),
  57                BarrierSet::FakeRtti(BarrierSet::ZBarrierSet)) {}
  58 
  59 ZBarrierSetAssembler* ZBarrierSet::assembler() {
  60   BarrierSetAssembler* const bsa = BarrierSet::barrier_set()->barrier_set_assembler();
  61   return reinterpret_cast<ZBarrierSetAssembler*>(bsa);
  62 }
  63 
  64 bool ZBarrierSet::barrier_needed(DecoratorSet decorators, BasicType type) {
  65   assert((decorators & AS_RAW) == 0, "Unexpected decorator");
  66   assert((decorators & AS_NO_KEEPALIVE) == 0, "Unexpected decorator");
  67   //assert((decorators & ON_UNKNOWN_OOP_REF) == 0, "Unexpected decorator");
  68 
  69   assert(type != T_VALUETYPE, "Not supported yet");
  70   if (type == T_OBJECT || type == T_ARRAY) {
  71     assert((decorators & (IN_HEAP | IN_NATIVE)) != 0, "Where is reference?");
  72     // Barrier needed even when IN_NATIVE, to allow concurrent scanning.
  73     return true;
  74   }
  75 
  76   // Barrier not needed
  77   return false;
  78 }
  79 
  80 void ZBarrierSet::on_thread_create(Thread* thread) {
  81   // Create thread local data
  82   ZThreadLocalData::create(thread);
  83 }
  84 
  85 void ZBarrierSet::on_thread_destroy(Thread* thread) {
  86   // Destroy thread local data
  87   ZThreadLocalData::destroy(thread);
  88 }
  89 
  90 void ZBarrierSet::on_thread_attach(Thread* thread) {
  91   // Set thread local address bad mask
  92   ZThreadLocalData::set_address_bad_mask(thread, ZAddressBadMask);
  93 }
  94 
  95 void ZBarrierSet::on_thread_detach(Thread* thread) {
  96   // Flush and free any remaining mark stacks
  97   ZHeap::heap()->mark_flush_and_free(thread);
  98 }