| /* |
| * Copyright (c) 2018, 2020, Red Hat, Inc. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "c1/c1_LIRAssembler.hpp" |
| #include "c1/c1_MacroAssembler.hpp" |
| #include "gc/shenandoah/shenandoahBarrierSet.hpp" |
| #include "gc/shenandoah/shenandoahBarrierSetAssembler.hpp" |
| #include "gc/shenandoah/c1/shenandoahBarrierSetC1.hpp" |
| |
| #define __ masm->masm()-> |
| |
| void LIR_OpShenandoahCompareAndSwap::emit_code(LIR_Assembler* masm) { |
| Register addr = _addr->as_register_lo(); |
| Register newval = _new_value->as_register(); |
| Register cmpval = _cmp_value->as_register(); |
| Register tmp1 = _tmp1->as_register(); |
| Register tmp2 = _tmp2->as_register(); |
| Register result = result_opr()->as_register(); |
| |
| ShenandoahBarrierSet::assembler()->iu_barrier(masm->masm(), newval, rscratch2); |
| |
| if (UseCompressedOops) { |
| __ encode_heap_oop(tmp1, cmpval); |
| cmpval = tmp1; |
| __ encode_heap_oop(tmp2, newval); |
| newval = tmp2; |
| } |
| |
| ShenandoahBarrierSet::assembler()->cmpxchg_oop(masm->masm(), addr, cmpval, newval, /*acquire*/ true, /*release*/ true, /*is_cae*/ false, result); |
| |
| if (UseBarriersForVolatile) { |
| // The membar here is necessary to prevent reordering between the |
| // release store in the CAS above and a subsequent volatile load. |
| // However for !UseBarriersForVolatile, C1 inserts a full barrier before |
| // volatile loads which means we don't need an additional barrier |
| // here (see LIRGenerator::volatile_field_load()). |
| __ membar(__ AnyAny); |
| } |
| } |
| |
| #undef __ |
| |
| #ifdef ASSERT |
| #define __ gen->lir(__FILE__, __LINE__)-> |
| #else |
| #define __ gen->lir()-> |
| #endif |
| |
| LIR_Opr ShenandoahBarrierSetC1::atomic_cmpxchg_at_resolved(LIRAccess& access, LIRItem& cmp_value, LIRItem& new_value) { |
| BasicType bt = access.type(); |
| if (access.is_oop()) { |
| LIRGenerator *gen = access.gen(); |
| if (ShenandoahSATBBarrier) { |
| pre_barrier(gen, access.access_emit_info(), access.decorators(), access.resolved_addr(), |
| LIR_OprFact::illegalOpr /* pre_val */); |
| } |
| if (ShenandoahCASBarrier) { |
| cmp_value.load_item(); |
| new_value.load_item(); |
| |
| LIR_Opr t1 = gen->new_register(T_OBJECT); |
| LIR_Opr t2 = gen->new_register(T_OBJECT); |
| LIR_Opr addr = access.resolved_addr()->as_address_ptr()->base(); |
| LIR_Opr result = gen->new_register(T_INT); |
| |
| __ append(new LIR_OpShenandoahCompareAndSwap(addr, cmp_value.result(), new_value.result(), t1, t2, result)); |
| return result; |
| } |
| } |
| return BarrierSetC1::atomic_cmpxchg_at_resolved(access, cmp_value, new_value); |
| } |
| |
| LIR_Opr ShenandoahBarrierSetC1::atomic_xchg_at_resolved(LIRAccess& access, LIRItem& value) { |
| LIRGenerator* gen = access.gen(); |
| BasicType type = access.type(); |
| |
| LIR_Opr result = gen->new_register(type); |
| value.load_item(); |
| LIR_Opr value_opr = value.result(); |
| |
| if (access.is_oop()) { |
| value_opr = iu_barrier(access.gen(), value_opr, access.access_emit_info(), access.decorators()); |
| } |
| |
| assert(type == T_INT || type == T_OBJECT || type == T_ARRAY LP64_ONLY( || type == T_LONG ), "unexpected type"); |
| LIR_Opr tmp = gen->new_register(T_INT); |
| __ xchg(access.resolved_addr(), value_opr, result, tmp); |
| |
| if (access.is_oop()) { |
| result = load_reference_barrier(access.gen(), result, LIR_OprFact::addressConst(0)); |
| LIR_Opr tmp = gen->new_register(type); |
| __ move(result, tmp); |
| result = tmp; |
| if (ShenandoahSATBBarrier) { |
| pre_barrier(access.gen(), access.access_emit_info(), access.decorators(), LIR_OprFact::illegalOpr, |
| result /* pre_val */); |
| } |
| } |
| |
| return result; |
| } |