1 /* 2 * Copyright (c) 2018, 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 "asm/macroAssembler.inline.hpp" 27 #include "gc/shared/barrierSet.hpp" 28 #include "gc/shared/cardTable.hpp" 29 #include "gc/shared/cardTableBarrierSet.hpp" 30 #include "gc/shared/cardTableModRefBSCodeGen.hpp" 31 #include "gc/shared/collectedHeap.hpp" 32 #include "runtime/globals.hpp" 33 34 #define __ masm-> 35 36 #ifdef PRODUCT 37 #define BLOCK_COMMENT(str) /* nothing */ 38 #else 39 #define BLOCK_COMMENT(str) __ block_comment(str) 40 #endif 41 42 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":") 43 44 void CardTableModRefBSCodeGen::gen_write_ref_array_post_barrier(MacroAssembler* masm, DecoratorSet decorators, 45 Register addr, Register count, Register tmp) { 46 BLOCK_COMMENT("CardTablePostBarrier"); 47 CardTableBarrierSet* ctbs = barrier_set_cast<CardTableBarrierSet>(bs); 48 CardTable* ct = ctbs->card_table(); 49 assert(sizeof(*ct->byte_map_base()) == sizeof(jbyte), "adjust this code"); 50 51 Label L_cardtable_loop, L_done; 52 53 __ cbz_32(count, L_done); // zero count - nothing to do 54 55 __ add_ptr_scaled_int32(count, addr, count, LogBytesPerHeapOop); 56 __ sub(count, count, BytesPerHeapOop); // last addr 57 58 __ logical_shift_right(addr, addr, CardTable::card_shift); 59 __ logical_shift_right(count, count, CardTable::card_shift); 60 __ sub(count, count, addr); // nb of cards 61 62 // warning: Rthread has not been preserved 63 __ mov_address(tmp, (address) ct->byte_map_base(), symbolic_Relocation::card_table_reference); 64 __ add(addr,tmp, addr); 65 66 Register zero = __ zero_register(tmp); 67 68 __ BIND(L_cardtable_loop); 69 __ strb(zero, Address(addr, 1, post_indexed)); 70 __ subs(count, count, 1); 71 __ b(L_cardtable_loop, ge); 72 __ BIND(L_done); 73 }