1 /*
2 * Copyright (c) 2018, 2019, Red Hat, Inc. All rights reserved.
3 * Copyright (c) 2020, 2021, Huawei Technologies Co., Ltd. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "c1/c1_LIRAssembler.hpp"
28 #include "c1/c1_MacroAssembler.hpp"
29 #include "gc/shared/gc_globals.hpp"
30 #include "gc/shenandoah/shenandoahBarrierSet.hpp"
31 #include "gc/shenandoah/shenandoahBarrierSetAssembler.hpp"
32 #include "gc/shenandoah/c1/shenandoahBarrierSetC1.hpp"
33
34 #define __ masm->masm()->
35
36 void LIR_OpShenandoahCompareAndSwap::emit_code(LIR_Assembler* masm) {
37 Register addr = _addr->as_register_lo();
38 Register newval = _new_value->as_register();
39 Register cmpval = _cmp_value->as_register();
40 Register tmp1 = _tmp1->as_register();
41 Register tmp2 = _tmp2->as_register();
42 Register result = result_opr()->as_register();
43
44 if (UseCompressedOops) {
45 __ encode_heap_oop(tmp1, cmpval);
46 cmpval = tmp1;
47 __ encode_heap_oop(tmp2, newval);
48 newval = tmp2;
49 }
50
51 ShenandoahBarrierSet::assembler()->cmpxchg_oop(masm->masm(), addr, cmpval, newval, /* acquire */ Assembler::aq,
52 /* release */ Assembler::rl, /* is_cae */ false, result);
53 }
54
55 #undef __
56
57 #ifdef ASSERT
58 #define __ gen->lir(__FILE__, __LINE__)->
59 #else
60 #define __ gen->lir()->
61 #endif
62
63 LIR_Opr ShenandoahBarrierSetC1::atomic_cmpxchg_at_resolved(LIRAccess& access, LIRItem& cmp_value, LIRItem& new_value) {
64 BasicType bt = access.type();
65 if (access.is_oop()) {
66 LIRGenerator *gen = access.gen();
67 if (ShenandoahSATBBarrier) {
68 pre_barrier(gen, access.access_emit_info(), access.decorators(), access.resolved_addr(),
69 LIR_OprFact::illegalOpr /* pre_val */);
70 }
71 if (ShenandoahCASBarrier) {
72 cmp_value.load_item();
73 new_value.load_item();
74
75 LIR_Opr tmp1 = gen->new_register(T_OBJECT);
76 LIR_Opr tmp2 = gen->new_register(T_OBJECT);
77 LIR_Opr addr = access.resolved_addr()->as_address_ptr()->base();
78 LIR_Opr result = gen->new_register(T_INT);
79
80 __ append(new LIR_OpShenandoahCompareAndSwap(addr, cmp_value.result(), new_value.result(), tmp1, tmp2, result));
81
82 if (ShenandoahCardBarrier) {
83 post_barrier(access, access.resolved_addr(), new_value.result());
84 }
85 return result;
86 }
87 }
88
89 return BarrierSetC1::atomic_cmpxchg_at_resolved(access, cmp_value, new_value);
90 }
91
92 LIR_Opr ShenandoahBarrierSetC1::atomic_xchg_at_resolved(LIRAccess& access, LIRItem& value) {
93 LIRGenerator* gen = access.gen();
94 BasicType type = access.type();
95
96 LIR_Opr result = gen->new_register(type);
97 value.load_item();
98 LIR_Opr value_opr = value.result();
99
100 assert(type == T_INT || is_reference_type(type) LP64_ONLY( || type == T_LONG ), "unexpected type");
101 LIR_Opr tmp = gen->new_register(T_INT);
102 __ xchg(access.resolved_addr(), value_opr, result, tmp);
103
104 if (access.is_oop()) {
105 result = load_reference_barrier(access.gen(), result, LIR_OprFact::addressConst(0), access.decorators());
106 LIR_Opr tmp_opr = gen->new_register(type);
107 __ move(result, tmp_opr);
108 result = tmp_opr;
109 if (ShenandoahSATBBarrier) {
110 pre_barrier(access.gen(), access.access_emit_info(), access.decorators(), LIR_OprFact::illegalOpr,
111 result /* pre_val */);
112 }
113 if (ShenandoahCardBarrier) {
114 post_barrier(access, access.resolved_addr(), result);
115 }
116 }
117
118 return result;
119 }