1 /*

     2  * Copyright (c) 2018, Red Hat, Inc. All rights reserved.

     3  *

     4  * This code is free software; you can redistribute it and/or modify it

     5  * under the terms of the GNU General Public License version 2 only, as

     6  * published by the Free Software Foundation.

     7  *

     8  * This code is distributed in the hope that it will be useful, but WITHOUT

     9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    11  * version 2 for more details (a copy is included in the LICENSE file that

    12  * accompanied this code).

    13  *

    14  * You should have received a copy of the GNU General Public License version

    15  * 2 along with this work; if not, write to the Free Software Foundation,

    16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    17  *

    18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    19  * or visit www.oracle.com if you need additional information or have any

    20  * questions.

    21  *

    22  */

    23 

    24 #include "precompiled.hpp"

    25 #include "c1/c1_LIRAssembler.hpp"

    26 #include "c1/c1_MacroAssembler.hpp"

    27 #include "gc/shenandoah/shenandoahBarrierSet.hpp"

    28 #include "gc/shenandoah/shenandoahBarrierSetAssembler.hpp"

    29 #include "gc/shenandoah/c1/shenandoahBarrierSetC1.hpp"

    30 

    31 void LIR_OpShenandoahCompareAndSwap::emit_code(LIR_Assembler* masm) {

    32   Register addr = _addr->as_register_lo();

    33   Register newval = _new_value->as_register();

    34   Register cmpval = _cmp_value->as_register();

    35   Register tmp1 = _tmp1->as_register();

    36   Register tmp2 = _tmp2->as_register();

    37   ShenandoahBarrierSet::assembler()->cmpxchg_oop(masm->masm(), addr, cmpval, newval, /*acquire*/ false, /*release*/ true, /*weak*/ false, true, tmp1, tmp2);

    38 }

    39 

    40 #ifdef ASSERT

    41 #define __ gen->lir(__FILE__, __LINE__)->

    42 #else

    43 #define __ gen->lir()->

    44 #endif

    45 

    46 LIR_Opr ShenandoahBarrierSetC1::atomic_cmpxchg_at_resolved(LIRAccess& access, LIRItem& cmp_value, LIRItem& new_value) {

    47   BasicType bt = access.type();

    48   if (access.is_oop()) {

    49     LIRGenerator *gen = access.gen();

    50     if (ShenandoahSATBBarrier) {

    51       pre_barrier(gen, access.access_emit_info(), access.decorators(), access.resolved_addr(),

    52                   LIR_OprFact::illegalOpr /* pre_val */);

    53     }

    54     if (ShenandoahCASBarrier) {

    55       cmp_value.load_item();

    56       new_value.load_item();

    57 

    58       LIR_Opr t1 = gen->new_register(T_OBJECT);

    59       LIR_Opr t2 = gen->new_register(T_OBJECT);

    60       LIR_Opr addr = access.resolved_addr()->as_address_ptr()->base();

    61 

    62       __ append(new LIR_OpShenandoahCompareAndSwap(addr, cmp_value.result(), new_value.result(), t1, t2,

    63                                                    LIR_OprFact::illegalOpr));

    64 

    65       LIR_Opr result = gen->new_register(T_INT);

    66       __ cmove(lir_cond_equal, LIR_OprFact::intConst(1), LIR_OprFact::intConst(0),

    67                result, T_INT);

    68       return result;

    69     }

    70   }

    71   return BarrierSetC1::atomic_cmpxchg_at_resolved(access, cmp_value, new_value);

    72 }

    73 

    74 LIR_Opr ShenandoahBarrierSetC1::atomic_xchg_at_resolved(LIRAccess& access, LIRItem& value) {

    75   LIRGenerator* gen = access.gen();

    76   BasicType type = access.type();

    77 

    78   LIR_Opr result = gen->new_register(type);

    79   value.load_item();

    80   LIR_Opr value_opr = value.result();

    81 

    82   if (access.is_oop()) {

    83     value_opr = storeval_barrier(access.gen(), value_opr, access.access_emit_info(), access.decorators());

    84   }

    85 

    86   assert(type == T_INT || type == T_OBJECT || type == T_ARRAY LP64_ONLY( || type == T_LONG ), "unexpected type");

    87   LIR_Opr tmp = gen->new_register(T_INT);

    88   __ xchg(access.resolved_addr(), value_opr, result, tmp);

    89 

    90   if (access.is_oop()) {

    91     if (ShenandoahSATBBarrier) {

    92       pre_barrier(access.gen(), access.access_emit_info(), access.decorators(), LIR_OprFact::illegalOpr,

    93                   result /* pre_val */);

    94     }

    95   }

    96 

    97   return result;

    98 }