1 /* 2 * Copyright (c) 2018, 2025, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "gc/shared/c1/modRefBarrierSetC1.hpp" 26 #include "utilities/macros.hpp" 27 28 #ifdef ASSERT 29 #define __ gen->lir(__FILE__, __LINE__)-> 30 #else 31 #define __ gen->lir()-> 32 #endif 33 34 void ModRefBarrierSetC1::store_at_resolved(LIRAccess& access, LIR_Opr value) { 35 DecoratorSet decorators = access.decorators(); 36 bool is_array = (decorators & IS_ARRAY) != 0; 37 bool on_anonymous = (decorators & ON_UNKNOWN_OOP_REF) != 0; 38 39 if (access.is_oop()) { 40 pre_barrier(access, access.resolved_addr(), 41 LIR_OprFact::illegalOpr /* pre_val */, access.patch_emit_info()); 42 } 43 44 BarrierSetC1::store_at_resolved(access, value); 45 46 if (access.is_oop()) { 47 bool precise = is_array || on_anonymous; 48 LIR_Opr post_addr = precise ? access.resolved_addr() : access.base().opr(); 49 post_barrier(access, post_addr, value); 50 } 51 } 52 53 LIR_Opr ModRefBarrierSetC1::atomic_cmpxchg_at_resolved(LIRAccess& access, LIRItem& cmp_value, LIRItem& new_value) { 54 if (access.is_oop()) { 55 pre_barrier(access, access.resolved_addr(), 56 LIR_OprFact::illegalOpr /* pre_val */, nullptr); 57 } 58 59 LIR_Opr result = BarrierSetC1::atomic_cmpxchg_at_resolved(access, cmp_value, new_value); 60 61 if (access.is_oop()) { 62 post_barrier(access, access.resolved_addr(), new_value.result()); 63 } 64 65 return result; 66 } 67 68 LIR_Opr ModRefBarrierSetC1::atomic_xchg_at_resolved(LIRAccess& access, LIRItem& value) { 69 if (access.is_oop()) { 70 pre_barrier(access, access.resolved_addr(), 71 LIR_OprFact::illegalOpr /* pre_val */, nullptr); 72 } 73 74 LIR_Opr result = BarrierSetC1::atomic_xchg_at_resolved(access, value); 75 76 if (access.is_oop()) { 77 post_barrier(access, access.resolved_addr(), value.result()); 78 } 79 80 return result; 81 } 82 83 // This overrides the default to resolve the address into a register, 84 // assuming it will be used by a write barrier anyway. 85 LIR_Opr ModRefBarrierSetC1::resolve_address(LIRAccess& access, bool resolve_in_register) { 86 DecoratorSet decorators = access.decorators(); 87 bool needs_patching = (decorators & C1_NEEDS_PATCHING) != 0; 88 bool is_write = (decorators & ACCESS_WRITE) != 0; 89 bool is_array = (decorators & IS_ARRAY) != 0; 90 bool on_anonymous = (decorators & ON_UNKNOWN_OOP_REF) != 0; 91 bool precise = is_array || on_anonymous; 92 resolve_in_register |= !needs_patching && is_write && access.is_oop() && precise; 93 return BarrierSetC1::resolve_address(access, resolve_in_register); 94 }