/*
 * Copyright (c) 2018, Red Hat, Inc. and/or its affiliates.
 *
 * 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.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#include "gc/shenandoah/c1/shenandoahLRBBarrierSetC1.hpp"

#ifdef ASSERT
#define __ gen->lir(__FILE__, __LINE__)->
#else
#define __ gen->lir()->
#endif

void ShenandoahLRBBarrierSetC1::store_at_resolved(LIRAccess& access, LIR_Opr value) {
  if (access.is_oop()) {
    if (ShenandoahSATBBarrier) {
      pre_barrier(access.gen(), access.access_emit_info(), access.decorators(), access.resolved_addr(), LIR_OprFact::illegalOpr /* pre_val */);
    }
    enqueue_barrier(access.gen(), value, access.access_emit_info(), access.decorators());
  }
  ShenandoahBaseBarrierSetC1::store_at_resolved(access, value);
}

void ShenandoahLRBBarrierSetC1::load_at_resolved(LIRAccess& access, LIR_Opr result) {
  if (access.is_oop()) {
    LIRGenerator* gen = access.gen();
    LIR_Opr result_tmp = gen->new_register(T_OBJECT);
    ShenandoahBaseBarrierSetC1::load_at_resolved(access, result_tmp);
    result_tmp = write_barrier(access.gen(), result_tmp, access.access_emit_info(),
                               true /*access.needs_null_check()*/);
    gen->lir()->move(result_tmp, result);
  } else {
    ShenandoahBaseBarrierSetC1::load_at_resolved(access, result);
  }
  if (ShenandoahKeepAliveBarrier) {
    DecoratorSet decorators = access.decorators();
    bool is_weak = (decorators & ON_WEAK_OOP_REF) != 0;
    bool is_phantom = (decorators & ON_PHANTOM_OOP_REF) != 0;
    bool is_anonymous = (decorators & ON_UNKNOWN_OOP_REF) != 0;
    LIRGenerator *gen = access.gen();
    if (access.is_oop() && (is_weak || is_phantom || is_anonymous)) {
      // Register the value in the referent field with the pre-barrier
      LabelObj *Lcont_anonymous;
      if (is_anonymous) {
        Lcont_anonymous = new LabelObj();
        generate_referent_check(access, Lcont_anonymous);
      }
      pre_barrier(access.gen(), access.access_emit_info(), access.decorators(), LIR_OprFact::illegalOpr /* addr_opr */,
                  result /* pre_val */);
      if (is_anonymous) {
        __ branch_destination(Lcont_anonymous->label());
      }
    }
  }
}

LIR_Opr ShenandoahLRBBarrierSetC1::atomic_cmpxchg_at_resolved(LIRAccess& access, LIRItem& cmp_value, LIRItem& new_value) {
  if (access.is_oop()) {
    if (ShenandoahSATBBarrier) {
      pre_barrier(access.gen(), access.access_emit_info(), access.decorators(), access.resolved_addr(),
                  LIR_OprFact::illegalOpr /* pre_val */);
    }
    enqueue_barrier(access.gen(), new_value.result(), access.access_emit_info(), access.decorators());
  }
  return ShenandoahBaseBarrierSetC1::atomic_cmpxchg_at_resolved(access, cmp_value, new_value);
}

LIR_Opr ShenandoahLRBBarrierSetC1::atomic_xchg_at_resolved(LIRAccess& access, LIRItem& value) {
  if (access.is_oop()) {
    if (ShenandoahSATBBarrier) {
      pre_barrier(access.gen(), access.access_emit_info(), access.decorators(), access.resolved_addr(),
                  LIR_OprFact::illegalOpr /* pre_val */);
    }
    enqueue_barrier(access.gen(), value.result(), access.access_emit_info(), access.decorators());
  }
  LIR_Opr result = ShenandoahBaseBarrierSetC1::atomic_xchg_at_resolved(access, value);
  if (access.is_oop()) {
    result = write_barrier(access.gen(), result, access.access_emit_info(), true);
  }
  return result;
}