1 /* 2 * Copyright (c) 2017, 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 "precompiled.hpp" 26 #include "gc/shared/c1CardTableModRefBSCodeGen.hpp" 27 #include "utilities/macros.hpp" 28 29 #ifdef ASSERT 30 #define __ lir_generator->lir(__FILE__, __LINE__)-> 31 #else 32 #define __ lir_generator->lir()-> 33 #endif 34 35 void C1CardTableModRefBSCodeGen::post_barrier(LIRGenerator *lir_generator, C1DecoratorSet decorators, 36 LIR_OprDesc* addr, LIR_OprDesc* new_val) { 37 BarrierSet *bs = Universe::heap()->barrier_set(); 38 CardTableModRefBS* ct = barrier_set_cast<CardTableModRefBS>(bs); 39 assert(sizeof(*(ct->card_table()->byte_map_base())) == sizeof(jbyte), "adjust this code"); 40 LIR_Const* card_table_base = new LIR_Const(ct->card_table()->byte_map_base()); 41 if (addr->is_address()) { 42 LIR_Address* address = addr->as_address_ptr(); 43 // ptr cannot be an object because we use this barrier for array card marks 44 // and addr can point in the middle of an array. 45 LIR_Opr ptr = lir_generator->new_pointer_register(); 46 if (!address->index()->is_valid() && address->disp() == 0) { 47 __ move(address->base(), ptr); 48 } else { 49 assert(address->disp() != max_jint, "lea doesn't support patched addresses!"); 50 __ leal(addr, ptr); 51 } 52 addr = ptr; 53 } 54 assert(addr->is_register(), "must be a register at this point"); 55 56 #ifdef CARDTABLEMODREF_POST_BARRIER_HELPER 57 CardTableModRef_post_barrier_helper(addr, card_table_base); 58 #else 59 LIR_Opr tmp = lir_generator->new_pointer_register(); 60 if (TwoOperandLIRForm) { 61 __ move(addr, tmp); 62 __ unsigned_shift_right(tmp, CardTable::card_shift, tmp); 63 } else { 64 __ unsigned_shift_right(addr, CardTable::card_shift, tmp); 65 } 66 67 LIR_Address* card_addr; 68 if (lir_generator->can_inline_as_constant(card_table_base)) { 69 card_addr = new LIR_Address(tmp, card_table_base->as_jint(), T_BYTE); 70 } else { 71 card_addr = new LIR_Address(tmp, lir_generator->load_constant(card_table_base), T_BYTE); 72 } 73 74 LIR_Opr dirty = LIR_OprFact::intConst(CardTable::dirty_card_val()); 75 if (UseCondCardMark) { 76 LIR_Opr cur_value = lir_generator->new_register(T_INT); 77 if (UseConcMarkSweepGC) { 78 __ membar_storeload(); 79 } 80 __ move(card_addr, cur_value); 81 82 LabelObj* L_already_dirty = new LabelObj(); 83 __ cmp(lir_cond_equal, cur_value, dirty); 84 __ branch(lir_cond_equal, T_BYTE, L_already_dirty->label()); 85 __ move(dirty, card_addr); 86 __ branch_destination(L_already_dirty->label()); 87 } else { 88 if (UseConcMarkSweepGC && CMSPrecleaningEnabled) { 89 __ membar_storestore(); 90 } 91 __ move(dirty, card_addr); 92 } 93 #endif 94 }