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112 lines
4.5 KiB
C++
112 lines
4.5 KiB
C++
/*
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* Copyright (c) 2018, 2021, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2018, 2021 SAP SE. 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 "interpreter/interp_masm.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, Register addr,
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Register count, Register preserve) {
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CardTableBarrierSet* ctbs = barrier_set_cast<CardTableBarrierSet>(BarrierSet::barrier_set());
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CardTable* ct = ctbs->card_table();
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assert_different_registers(addr, count, R0);
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Label Lskip_loop, Lstore_loop;
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__ sldi_(count, count, LogBytesPerHeapOop);
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__ beq(CCR0, Lskip_loop); // zero length
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__ addi(count, count, -BytesPerHeapOop);
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__ add(count, addr, count);
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// Use two shifts to clear out those low order two bits! (Cannot opt. into 1.)
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__ srdi(addr, addr, CardTable::card_shift);
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__ srdi(count, count, CardTable::card_shift);
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__ subf(count, addr, count);
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__ add_const_optimized(addr, addr, (address)ct->byte_map_base(), R0);
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__ addi(count, count, 1);
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__ li(R0, 0);
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__ mtctr(count);
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// Byte store loop
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__ bind(Lstore_loop);
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__ stb(R0, 0, addr);
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__ addi(addr, addr, 1);
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__ bdnz(Lstore_loop);
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__ bind(Lskip_loop);
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}
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void CardTableBarrierSetAssembler::card_table_write(MacroAssembler* masm,
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CardTable::CardValue* byte_map_base,
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Register tmp, Register obj) {
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assert_different_registers(obj, tmp, R0);
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__ load_const_optimized(tmp, (address)byte_map_base, R0);
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__ srdi(obj, obj, CardTable::card_shift);
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__ li(R0, CardTable::dirty_card_val());
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__ stbx(R0, tmp, obj);
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}
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void CardTableBarrierSetAssembler::card_write_barrier_post(MacroAssembler* masm, Register store_addr, Register tmp) {
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CardTableBarrierSet* bs = barrier_set_cast<CardTableBarrierSet>(BarrierSet::barrier_set());
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card_table_write(masm, bs->card_table()->byte_map_base(), tmp, store_addr);
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}
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void CardTableBarrierSetAssembler::oop_store_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
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Register base, RegisterOrConstant ind_or_offs, Register val,
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Register tmp1, Register tmp2, Register tmp3,
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MacroAssembler::PreservationLevel preservation_level) {
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bool is_array = (decorators & IS_ARRAY) != 0;
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bool on_anonymous = (decorators & ON_UNKNOWN_OOP_REF) != 0;
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bool precise = is_array || on_anonymous;
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BarrierSetAssembler::store_at(masm, decorators, type,
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base, ind_or_offs, val,
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tmp1, tmp2, tmp3,
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preservation_level);
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// No need for post barrier if storing NULL
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if (val != noreg) {
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if (precise) {
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if (ind_or_offs.is_constant()) {
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__ add_const_optimized(base, base, ind_or_offs.as_constant(), tmp1);
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} else {
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__ add(base, ind_or_offs.as_register(), base);
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}
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}
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card_write_barrier_post(masm, base, tmp1);
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}
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}
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