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/cardTableBarrierSetC1.hpp" 26 #include "gc/shared/cardTable.hpp" 27 #include "gc/shared/cardTableBarrierSet.hpp" 28 #include "gc/shared/gc_globals.hpp" 29 #include "utilities/macros.hpp" 30 31 #ifdef ASSERT 32 #define __ gen->lir(__FILE__, __LINE__)-> 33 #else 34 #define __ gen->lir()-> 35 #endif 36 37 void CardTableBarrierSetC1::post_barrier(LIRAccess& access, LIR_Opr addr, LIR_Opr new_val) { 38 DecoratorSet decorators = access.decorators(); 39 LIRGenerator* gen = access.gen(); 40 bool in_heap = (decorators & IN_HEAP) != 0; 41 if (!in_heap) { 42 return; 43 } 44 45 BarrierSet* bs = BarrierSet::barrier_set(); 46 CardTableBarrierSet* ctbs = barrier_set_cast<CardTableBarrierSet>(bs); 47 CardTable* ct = ctbs->card_table(); 48 LIR_Const* card_table_base = new LIR_Const(ct->byte_map_base()); 49 SHENANDOAHGC_ONLY(assert(!UseShenandoahGC, "Shenandoah byte_map_base is not constant.");) 50 51 if (addr->is_address()) { 52 LIR_Address* address = addr->as_address_ptr(); 53 // ptr cannot be an object because we use this barrier for array card marks 54 // and addr can point in the middle of an array. 55 LIR_Opr ptr = gen->new_pointer_register(); 56 if (!address->index()->is_valid() && address->disp() == 0) { 57 __ move(address->base(), ptr); 58 } else { 59 assert(address->disp() != max_jint, "lea doesn't support patched addresses!"); 60 __ leal(addr, ptr); 61 } 62 addr = ptr; 63 } 64 assert(addr->is_register(), "must be a register at this point"); 65 66 #ifdef CARDTABLEBARRIERSET_POST_BARRIER_HELPER 67 gen->CardTableBarrierSet_post_barrier_helper(addr, card_table_base); 68 #else 69 LIR_Opr tmp = gen->new_pointer_register(); 70 if (two_operand_lir_form) { 71 LIR_Opr addr_opr = LIR_OprFact::address(new LIR_Address(addr, addr->type())); 72 __ leal(addr_opr, tmp); 73 __ unsigned_shift_right(tmp, CardTable::card_shift(), tmp); 74 } else { 75 __ unsigned_shift_right(addr, CardTable::card_shift(), tmp); 76 } 77 78 LIR_Address* card_addr; 79 if (gen->can_inline_as_constant(card_table_base)) { 80 card_addr = new LIR_Address(tmp, card_table_base->as_jint(), T_BYTE); 81 } else { 82 card_addr = new LIR_Address(tmp, gen->load_constant(card_table_base), T_BYTE); 83 } 84 85 LIR_Opr dirty = LIR_OprFact::intConst(CardTable::dirty_card_val()); 86 if (UseCondCardMark) { 87 LIR_Opr cur_value = gen->new_register(T_INT); 88 __ move(card_addr, cur_value); 89 90 LabelObj* L_already_dirty = new LabelObj(); 91 __ cmp(lir_cond_equal, cur_value, dirty); 92 __ branch(lir_cond_equal, L_already_dirty->label()); 93 __ move(dirty, card_addr); 94 __ branch_destination(L_already_dirty->label()); 95 } else { 96 __ move(dirty, card_addr); 97 } 98 #endif 99 }