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 }