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73 lines
2.7 KiB
C++
73 lines
2.7 KiB
C++
/*
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* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "asm/macroAssembler.inline.hpp"
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#include "gc/shared/barrierSet.hpp"
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#include "gc/shared/cardTable.hpp"
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#include "gc/shared/cardTableBarrierSet.hpp"
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#include "gc/shared/cardTableBarrierSetAssembler.hpp"
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#include "gc/shared/collectedHeap.hpp"
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#include "runtime/globals.hpp"
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#define __ masm->
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#ifdef PRODUCT
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#define BLOCK_COMMENT(str) /* nothing */
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#else
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#define BLOCK_COMMENT(str) __ block_comment(str)
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#endif
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#define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
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void CardTableBarrierSetAssembler::gen_write_ref_array_post_barrier(MacroAssembler* masm, DecoratorSet decorators,
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Register addr, Register count, Register tmp) {
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BLOCK_COMMENT("CardTablePostBarrier");
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CardTableBarrierSet* ctbs = barrier_set_cast<CardTableBarrierSet>(bs);
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CardTable* ct = ctbs->card_table();
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assert(sizeof(*ct->byte_map_base()) == sizeof(jbyte), "adjust this code");
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Label L_cardtable_loop, L_done;
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__ cbz_32(count, L_done); // zero count - nothing to do
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__ add_ptr_scaled_int32(count, addr, count, LogBytesPerHeapOop);
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__ sub(count, count, BytesPerHeapOop); // last addr
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__ logical_shift_right(addr, addr, CardTable::card_shift);
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__ logical_shift_right(count, count, CardTable::card_shift);
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__ sub(count, count, addr); // nb of cards
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// warning: Rthread has not been preserved
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__ mov_address(tmp, (address) ct->byte_map_base(), symbolic_Relocation::card_table_reference);
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__ add(addr,tmp, addr);
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Register zero = __ zero_register(tmp);
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__ BIND(L_cardtable_loop);
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__ strb(zero, Address(addr, 1, post_indexed));
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__ subs(count, count, 1);
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__ b(L_cardtable_loop, ge);
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__ BIND(L_done);
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}
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