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);
 103     LIR_Opr tmp = gen->new_register(type);
 104     __ move(result, tmp);
 105     result = tmp;
 106     if (ShenandoahSATBBarrier) {
 107       pre_barrier(access.gen(), access.access_emit_info(), access.decorators(), LIR_OprFact::illegalOpr,
 108                   result /* pre_val */);
 109     }
 110   }
 111 
 112   return result;
 113 }