1 /*
 2  * Copyright (c) 2018, 2025, 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
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24 
25 #include "gc/shared/c1/modRefBarrierSetC1.hpp"
26 #include "utilities/macros.hpp"
27 
28 #ifdef ASSERT
29 #define __ gen->lir(__FILE__, __LINE__)->
30 #else
31 #define __ gen->lir()->
32 #endif
33 
34 void ModRefBarrierSetC1::store_at_resolved(LIRAccess& access, LIR_Opr value) {
35   DecoratorSet decorators = access.decorators();
36   bool is_array = (decorators & IS_ARRAY) != 0;
37   bool on_anonymous = (decorators & ON_UNKNOWN_OOP_REF) != 0;
38 
39   if (access.is_oop()) {
40     pre_barrier(access, access.resolved_addr(),
41                 LIR_OprFact::illegalOpr /* pre_val */, access.patch_emit_info());
42   }
43 
44   BarrierSetC1::store_at_resolved(access, value);
45 
46   if (access.is_oop()) {
47     bool precise = is_array || on_anonymous;
48     LIR_Opr post_addr = precise ? access.resolved_addr() : access.base().opr();
49     post_barrier(access, post_addr, value);
50   }
51 }
52 
53 LIR_Opr ModRefBarrierSetC1::atomic_cmpxchg_at_resolved(LIRAccess& access, LIRItem& cmp_value, LIRItem& new_value) {
54   if (access.is_oop()) {
55     pre_barrier(access, access.resolved_addr(),
56                 LIR_OprFact::illegalOpr /* pre_val */, nullptr);
57   }
58 
59   LIR_Opr result = BarrierSetC1::atomic_cmpxchg_at_resolved(access, cmp_value, new_value);
60 
61   if (access.is_oop()) {
62     post_barrier(access, access.resolved_addr(), new_value.result());
63   }
64 
65   return result;
66 }
67 
68 LIR_Opr ModRefBarrierSetC1::atomic_xchg_at_resolved(LIRAccess& access, LIRItem& value) {
69   if (access.is_oop()) {
70     pre_barrier(access, access.resolved_addr(),
71                 LIR_OprFact::illegalOpr /* pre_val */, nullptr);
72   }
73 
74   LIR_Opr result = BarrierSetC1::atomic_xchg_at_resolved(access, value);
75 
76   if (access.is_oop()) {
77     post_barrier(access, access.resolved_addr(), value.result());
78   }
79 
80   return result;
81 }
82 
83 // This overrides the default to resolve the address into a register,
84 // assuming it will be used by a write barrier anyway.
85 LIR_Opr ModRefBarrierSetC1::resolve_address(LIRAccess& access, bool resolve_in_register) {
86   DecoratorSet decorators = access.decorators();
87   bool needs_patching = (decorators & C1_NEEDS_PATCHING) != 0;
88   bool is_write = (decorators & ACCESS_WRITE) != 0;
89   bool is_array = (decorators & IS_ARRAY) != 0;
90   bool on_anonymous = (decorators & ON_UNKNOWN_OOP_REF) != 0;
91   bool precise = is_array || on_anonymous;
92   resolve_in_register |= !needs_patching && is_write && access.is_oop() && precise;
93   return BarrierSetC1::resolve_address(access, resolve_in_register);
94 }