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, access.access_emit_info(), true); 103 if (ShenandoahSATBBarrier) { 104 pre_barrier(access.gen(), access.access_emit_info(), access.decorators(), LIR_OprFact::illegalOpr, 105 result /* pre_val */); 106 } 107 } 108 109 return result; 110 }