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 #ifndef SHARE_GC_G1_C1_G1BARRIERSETC1_HPP
26 #define SHARE_GC_G1_C1_G1BARRIERSETC1_HPP
27
28 #include "c1/c1_CodeStubs.hpp"
29 #include "gc/shared/c1/modRefBarrierSetC1.hpp"
30
31 class G1PreBarrierStub: public CodeStub {
32 friend class G1BarrierSetC1;
33 private:
34 bool _do_load;
35 LIR_Opr _addr;
36 LIR_Opr _pre_val;
37 LIR_PatchCode _patch_code;
38 CodeEmitInfo* _info;
39
40 public:
41 // Version that _does_ generate a load of the previous value from addr.
42 // addr (the address of the field to be read) must be a LIR_Address
43 // pre_val (a temporary register) must be a register;
44 G1PreBarrierStub(LIR_Opr addr, LIR_Opr pre_val, LIR_PatchCode patch_code, CodeEmitInfo* info) :
45 _addr(addr), _pre_val(pre_val), _do_load(true),
46 _patch_code(patch_code), _info(info)
47 {
48 assert(_pre_val->is_register(), "should be temporary register");
49 assert(_addr->is_address(), "should be the address of the field");
50 }
51
52 // Version that _does not_ generate load of the previous value; the
53 // previous value is assumed to have already been loaded into pre_val.
54 G1PreBarrierStub(LIR_Opr pre_val) :
55 _addr(LIR_OprFact::illegalOpr), _pre_val(pre_val), _do_load(false),
56 _patch_code(lir_patch_none), _info(NULL)
57 {
58 assert(_pre_val->is_register(), "should be a register");
59 }
60
61 LIR_Opr addr() const { return _addr; }
62 LIR_Opr pre_val() const { return _pre_val; }
63 LIR_PatchCode patch_code() const { return _patch_code; }
64 CodeEmitInfo* info() const { return _info; }
65 bool do_load() const { return _do_load; }
66
67 virtual void emit_code(LIR_Assembler* e);
68 virtual void visit(LIR_OpVisitState* visitor) {
69 if (_do_load) {
70 // don't pass in the code emit info since it's processed in the fast
71 // path
72 if (_info != NULL)
73 visitor->do_slow_case(_info);
74 else
75 visitor->do_slow_case();
76
77 visitor->do_input(_addr);
78 visitor->do_temp(_pre_val);
79 } else {
80 visitor->do_slow_case();
81 visitor->do_input(_pre_val);
82 }
83 }
84 #ifndef PRODUCT
85 virtual void print_name(outputStream* out) const { out->print("G1PreBarrierStub"); }
86 #endif // PRODUCT
87 };
88
89 class G1PostBarrierStub: public CodeStub {
90 friend class G1BarrierSetC1;
91 private:
92 LIR_Opr _addr;
93 LIR_Opr _new_val;
94
95 public:
96 // addr (the address of the object head) and new_val must be registers.
97 G1PostBarrierStub(LIR_Opr addr, LIR_Opr new_val): _addr(addr), _new_val(new_val) { }
98
99 LIR_Opr addr() const { return _addr; }
100 LIR_Opr new_val() const { return _new_val; }
101
102 virtual void emit_code(LIR_Assembler* e);
103 virtual void visit(LIR_OpVisitState* visitor) {
104 // don't pass in the code emit info since it's processed in the fast path
105 visitor->do_slow_case();
106 visitor->do_input(_addr);
107 visitor->do_input(_new_val);
108 }
109 #ifndef PRODUCT
110 virtual void print_name(outputStream* out) const { out->print("G1PostBarrierStub"); }
111 #endif // PRODUCT
112 };
113
114 class CodeBlob;
115
116 class G1BarrierSetC1 : public ModRefBarrierSetC1 {
117 protected:
118 CodeBlob* _pre_barrier_c1_runtime_code_blob;
119 CodeBlob* _post_barrier_c1_runtime_code_blob;
120
121 virtual void pre_barrier(LIRAccess& access, LIR_Opr addr_opr,
122 LIR_Opr pre_val, CodeEmitInfo* info);
123 virtual void post_barrier(LIRAccess& access, LIR_OprDesc* addr, LIR_OprDesc* new_val);
124
125 virtual void load_at_resolved(LIRAccess& access, LIR_Opr result);
126
127 public:
128 G1BarrierSetC1()
129 : _pre_barrier_c1_runtime_code_blob(NULL),
130 _post_barrier_c1_runtime_code_blob(NULL) {}
131
132 CodeBlob* pre_barrier_c1_runtime_code_blob() { return _pre_barrier_c1_runtime_code_blob; }
133 CodeBlob* post_barrier_c1_runtime_code_blob() { return _post_barrier_c1_runtime_code_blob; }
134
135 virtual void generate_c1_runtime_stubs(BufferBlob* buffer_blob);
136 };
137
138 #endif // SHARE_GC_G1_C1_G1BARRIERSETC1_HPP