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 }