src/hotspot/share/gc/z/zBarrierSet.cpp

/*
 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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#include "precompiled.hpp"
#include "gc/z/zBarrierSet.hpp"
#include "gc/z/zBarrierSetAssembler.hpp"
#include "gc/z/zGlobals.hpp"
#include "gc/z/zHeap.inline.hpp"
#include "gc/z/zThreadLocalData.hpp"
#include "runtime/thread.hpp"
#ifdef COMPILER1
#include "gc/z/c1/zBarrierSetC1.hpp"
#endif
#ifdef COMPILER2
#include "gc/z/c2/zBarrierSetC2.hpp"
#endif

class ZBarrierSetC1;
class ZBarrierSetC2;

ZBarrierSet::ZBarrierSet() :
    BarrierSet(make_barrier_set_assembler<ZBarrierSetAssembler>(),
               COMPILER1_PRESENT( make_barrier_set_c1<ZBarrierSetC1>() ) NOT_COMPILER1(NULL),
               COMPILER2_PRESENT( make_barrier_set_c2<ZBarrierSetC2>() ) NOT_COMPILER2(NULL),
               BarrierSet::FakeRtti(BarrierSet::ZBarrierSet)) {}

ZBarrierSetAssembler* ZBarrierSet::assembler() {
  BarrierSetAssembler* const bsa = BarrierSet::barrier_set()->barrier_set_assembler();
  return reinterpret_cast<ZBarrierSetAssembler*>(bsa);
}

bool ZBarrierSet::barrier_needed(DecoratorSet decorators, BasicType type) {
  assert((decorators & AS_RAW) == 0, "Unexpected decorator");
  assert((decorators & AS_NO_KEEPALIVE) == 0, "Unexpected decorator");
  //assert((decorators & ON_UNKNOWN_OOP_REF) == 0, "Unexpected decorator");

  if (type == T_OBJECT || type == T_ARRAY) {
    assert((decorators & (IN_HEAP | IN_NATIVE)) != 0, "Where is reference?");
    // Barrier needed even when IN_NATIVE, to allow concurrent scanning.
    return true;
  }

  // Barrier not needed
  return false;
}

void ZBarrierSet::on_thread_create(Thread* thread) {
  // Create thread local data
  ZThreadLocalData::create(thread);
}

void ZBarrierSet::on_thread_destroy(Thread* thread) {
  // Destroy thread local data
  ZThreadLocalData::destroy(thread);
}

void ZBarrierSet::on_thread_attach(JavaThread* thread) {
  // Set thread local address bad mask
  ZThreadLocalData::set_address_bad_mask(thread, ZAddressBadMask);
}

void ZBarrierSet::on_thread_detach(JavaThread* thread) {
  // Flush and free any remaining mark stacks
  ZHeap::heap()->mark_flush_and_free(thread);
}