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