1 /* 2 * Copyright (c) 2018, 2019, Red Hat, Inc. All rights reserved. 3 * Copyright (c) 2020, 2021, Huawei Technologies Co., Ltd. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "precompiled.hpp" 27 #include "c1/c1_LIRAssembler.hpp" 28 #include "c1/c1_MacroAssembler.hpp" 29 #include "gc/shared/gc_globals.hpp" 30 #include "gc/shenandoah/shenandoahBarrierSet.hpp" 31 #include "gc/shenandoah/shenandoahBarrierSetAssembler.hpp" 32 #include "gc/shenandoah/c1/shenandoahBarrierSetC1.hpp" 33 34 #define __ masm->masm()-> 35 36 void LIR_OpShenandoahCompareAndSwap::emit_code(LIR_Assembler* masm) { 37 Register addr = _addr->as_register_lo(); 38 Register newval = _new_value->as_register(); 39 Register cmpval = _cmp_value->as_register(); 40 Register tmp1 = _tmp1->as_register(); 41 Register tmp2 = _tmp2->as_register(); 42 Register result = result_opr()->as_register(); 43 44 if (UseCompressedOops) { 45 __ encode_heap_oop(tmp1, cmpval); 46 cmpval = tmp1; 47 __ encode_heap_oop(tmp2, newval); 48 newval = tmp2; 49 } 50 51 ShenandoahBarrierSet::assembler()->cmpxchg_oop(masm->masm(), addr, cmpval, newval, /* acquire */ Assembler::aq, 52 /* release */ Assembler::rl, /* is_cae */ false, result); 53 } 54 55 #undef __ 56 57 #ifdef ASSERT 58 #define __ gen->lir(__FILE__, __LINE__)-> 59 #else 60 #define __ gen->lir()-> 61 #endif 62 63 LIR_Opr ShenandoahBarrierSetC1::atomic_cmpxchg_at_resolved(LIRAccess& access, LIRItem& cmp_value, LIRItem& new_value) { 64 BasicType bt = access.type(); 65 if (access.is_oop()) { 66 LIRGenerator *gen = access.gen(); 67 if (ShenandoahSATBBarrier) { 68 pre_barrier(gen, access.access_emit_info(), access.decorators(), access.resolved_addr(), 69 LIR_OprFact::illegalOpr /* pre_val */); 70 } 71 if (ShenandoahCASBarrier) { 72 cmp_value.load_item(); 73 new_value.load_item(); 74 75 LIR_Opr tmp1 = gen->new_register(T_OBJECT); 76 LIR_Opr tmp2 = gen->new_register(T_OBJECT); 77 LIR_Opr addr = access.resolved_addr()->as_address_ptr()->base(); 78 LIR_Opr result = gen->new_register(T_INT); 79 80 __ append(new LIR_OpShenandoahCompareAndSwap(addr, cmp_value.result(), new_value.result(), tmp1, tmp2, result)); 81 return result; 82 } 83 } 84 return BarrierSetC1::atomic_cmpxchg_at_resolved(access, cmp_value, new_value); 85 } 86 87 LIR_Opr ShenandoahBarrierSetC1::atomic_xchg_at_resolved(LIRAccess& access, LIRItem& value) { 88 LIRGenerator* gen = access.gen(); 89 BasicType type = access.type(); 90 91 LIR_Opr result = gen->new_register(type); 92 value.load_item(); 93 LIR_Opr value_opr = value.result(); 94 95 assert(type == T_INT || is_reference_type(type) LP64_ONLY( || type == T_LONG ), "unexpected type"); 96 LIR_Opr tmp = gen->new_register(T_INT); 97 __ xchg(access.resolved_addr(), value_opr, result, tmp); 98 99 if (access.is_oop()) { 100 result = load_reference_barrier(access.gen(), result, LIR_OprFact::addressConst(0), access.decorators()); 101 LIR_Opr tmp_opr = gen->new_register(type); 102 __ move(result, tmp_opr); 103 result = tmp_opr; 104 if (ShenandoahSATBBarrier) { 105 pre_barrier(access.gen(), access.access_emit_info(), access.decorators(), LIR_OprFact::illegalOpr, 106 result /* pre_val */); 107 } 108 } 109 110 return result; 111 } --- EOF ---