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 #define __ masm->masm()->

    32 

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

    34   Register addr = _addr->as_register_lo();

    35   Register newval = _new_value->as_register();

    36   Register cmpval = _cmp_value->as_register();

    37   Register tmp1 = _tmp1->as_register();

    38   Register tmp2 = _tmp2->as_register();

    39   Register result = result_opr()->as_register();

    40 

    41   ShenandoahBarrierSet::assembler()->storeval_barrier(masm->masm(), newval, rscratch2);

    42 

    43   if (UseCompressedOops) {

    44     __ encode_heap_oop(tmp1, cmpval);

    45     cmpval = tmp1;

    46     __ encode_heap_oop(tmp2, newval);

    47     newval = tmp2;

    48   }

    49 

    50   ShenandoahBarrierSet::assembler()->cmpxchg_oop(masm->masm(), addr, cmpval, newval, /*acquire*/ false, /*release*/ true, /*weak*/ false, /*is_cae*/ false, result);

    51 }

    52 

    53 #undef __

    54 

    55 #ifdef ASSERT

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

    57 #else

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

    59 #endif

    60 

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

    62   BasicType bt = access.type();

    63   if (access.is_oop()) {

    64     LIRGenerator *gen = access.gen();

    65     if (ShenandoahSATBBarrier) {

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

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

    68     }

    69     if (ShenandoahCASBarrier) {

    70       cmp_value.load_item();

    71       new_value.load_item();

    72 

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

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

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

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

    77 

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

    79       return result;

    80     }

    81   }

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

    83 }

    84 

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

    86   LIRGenerator* gen = access.gen();

    87   BasicType type = access.type();

    88 

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

    90   value.load_item();

    91   LIR_Opr value_opr = value.result();

    92 

    93   if (access.is_oop()) {

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

    95   }

    96 

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

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

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

   100 

   101   if (access.is_oop()) {

   102     result = load_reference_barrier(access.gen(), result, access.access_emit_info(), true);

   103     if (ShenandoahSATBBarrier) {

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

   105                   result /* pre_val */);

   106     }

   107   }

   108 

   109   return result;

   110 }