1 /*
2 * Copyright (c) 2018, 2021, Red Hat, Inc. 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_SHENANDOAH_C2_SHENANDOAHBARRIERSETC2_HPP
26 #define SHARE_GC_SHENANDOAH_C2_SHENANDOAHBARRIERSETC2_HPP
27
28 #include "shenandoahBarrierSetC2.hpp"
29 #include "gc/shared/c2/barrierSetC2.hpp"
30 #include "utilities/growableArray.hpp"
31
32 static const uint8_t ShenandoahBarrierStrong = 1 << 0;
33 static const uint8_t ShenandoahBarrierWeak = 1 << 1;
34 static const uint8_t ShenandoahBarrierPhantom = 1 << 2;
35 static const uint8_t ShenandoahBarrierNative = 1 << 3;
36 static const uint8_t ShenandoahBarrierElided = 1 << 4;
37 static const uint8_t ShenandoahBarrierSATB = 1 << 5;
38 static const uint8_t ShenandoahBarrierCardMark = 1 << 6;
39 static const uint8_t ShenandoahBarrierCardMarkNotNull = 1 << 7;
40
41 class ShenandoahBarrierStubC2;
42
43 class ShenandoahBarrierSetC2State : public BarrierSetC2State {
44 GrowableArray<ShenandoahBarrierStubC2*>* _stubs;
45 int _stubs_start_offset;
46
47 public:
48 explicit ShenandoahBarrierSetC2State(Arena* comp_arena);
49
50 bool needs_liveness_data(const MachNode* mach) const override;
51 bool needs_livein_data() const override;
52
53 GrowableArray<ShenandoahBarrierStubC2*>* stubs() {
54 return _stubs;
55 }
56
57 void set_stubs_start_offset(int offset) {
58 _stubs_start_offset = offset;
59 }
60
61 int stubs_start_offset() {
62 return _stubs_start_offset;
63 }};
64
65 class ShenandoahBarrierSetC2 : public BarrierSetC2 {
66
67 static bool clone_needs_barrier(Node* src, PhaseGVN& gvn);
68
69 protected:
70 virtual Node* load_at_resolved(C2Access& access, const Type* val_type) const;
71 virtual Node* store_at_resolved(C2Access& access, C2AccessValue& val) const;
72 virtual Node* atomic_cmpxchg_val_at_resolved(C2AtomicParseAccess& access, Node* expected_val,
73 Node* new_val, const Type* val_type) const;
74 virtual Node* atomic_cmpxchg_bool_at_resolved(C2AtomicParseAccess& access, Node* expected_val,
75 Node* new_val, const Type* value_type) const;
76 virtual Node* atomic_xchg_at_resolved(C2AtomicParseAccess& access, Node* new_val, const Type* val_type) const;
77
78 public:
79 static ShenandoahBarrierSetC2* bsc2();
80
81 static bool is_shenandoah_clone_call(Node* call);
82
83 ShenandoahBarrierSetC2State* state() const;
84
85 static const TypeFunc* clone_barrier_Type();
86
87 // This is the entry-point for the backend to perform accesses through the Access API.
88 virtual void clone_at_expansion(PhaseMacroExpand* phase, ArrayCopyNode* ac) const;
89
90 // These are general helper methods used by C2
91 virtual bool array_copy_requires_gc_barriers(bool tightly_coupled_alloc, BasicType type, bool is_clone, bool is_clone_instance, ArrayCopyPhase phase) const;
92
93 // Support for GC barriers emitted during parsing
94 virtual bool is_gc_barrier_node(Node* node) const;
95 virtual bool expand_barriers(Compile* C, PhaseIterGVN& igvn) const;
96
97 // Support for macro expanded GC barriers
98 virtual void eliminate_gc_barrier(PhaseMacroExpand* macro, Node* node) const;
99 virtual void eliminate_gc_barrier_data(Node* node) const;
100
101 // Allow barrier sets to have shared state that is preserved across a compilation unit.
102 // This could for example comprise macro nodes to be expanded during macro expansion.
103 virtual void* create_barrier_state(Arena* comp_arena) const;
104
105 #ifdef ASSERT
106 virtual void verify_gc_barriers(Compile* compile, CompilePhase phase) const;
107 #endif
108
109 int estimate_stub_size() const /* override */;
110 void emit_stubs(CodeBuffer& cb) const /* override */;
111 void late_barrier_analysis() const /* override*/ {
112 compute_liveness_at_stubs();
113 }
114
115 };
116
117 class ShenandoahBarrierStubC2 : public BarrierStubC2 {
118 protected:
119 explicit ShenandoahBarrierStubC2(const MachNode* node) : BarrierStubC2(node) {}
120 void register_stub();
121 public:
122 virtual void emit_code(MacroAssembler& masm) = 0;
123 };
124
125 class ShenandoahLoadRefBarrierStubC2 : public ShenandoahBarrierStubC2 {
126 Register _obj;
127 Register _addr;
128 Register _tmp1;
129 Register _tmp2;
130 Register _tmp3;
131 bool _narrow;
132 ShenandoahLoadRefBarrierStubC2(const MachNode* node, Register obj, Register addr, Register tmp1, Register tmp2, Register tmp3, bool narrow) :
133 ShenandoahBarrierStubC2(node), _obj(obj), _addr(addr), _tmp1(tmp1), _tmp2(tmp2), _tmp3(tmp3), _narrow(narrow) {}
134 public:
135 static bool needs_barrier(const MachNode* node) {
136 return (node->barrier_data() & (ShenandoahBarrierStrong | ShenandoahBarrierWeak | ShenandoahBarrierPhantom | ShenandoahBarrierNative)) != 0;
137 }
138 static ShenandoahLoadRefBarrierStubC2* create(const MachNode* node, Register obj, Register addr, Register tmp1, Register tmp2, Register tmp3, bool narrow);
139 void emit_code(MacroAssembler& masm) override;
140 };
141
142 class ShenandoahSATBBarrierStubC2 : public ShenandoahBarrierStubC2 {
143 Register _addr;
144 Register _preval;
145 Register _tmp;
146 ShenandoahSATBBarrierStubC2(const MachNode* node, Register addr, Register preval, Register tmp) :
147 ShenandoahBarrierStubC2(node), _addr(addr), _preval(preval), _tmp(tmp) {}
148
149 public:
150 static bool needs_barrier(const MachNode* node) {
151 return (node->barrier_data() & ShenandoahBarrierSATB) != 0;
152 }
153 static ShenandoahSATBBarrierStubC2* create(const MachNode* node, Register addr, Register preval, Register tmp = noreg);
154
155 void emit_code(MacroAssembler& masm) override;
156 };
157
158 class ShenandoahCASBarrierSlowStubC2 : public ShenandoahBarrierStubC2 {
159 Register _addr_reg;
160 Address _addr;
161 Register _expected;
162 Register _new_val;
163 Register _result;
164 Register _tmp1;
165 Register _tmp2;
166 bool _cae;
167 bool _acquire;
168 bool _release;
169 bool _weak;
170
171 explicit ShenandoahCASBarrierSlowStubC2(const MachNode* node, Register addr_reg, Address addr, Register expected, Register new_val, Register result, Register tmp1, Register tmp2, bool cae, bool acquire, bool release, bool weak) :
172 ShenandoahBarrierStubC2(node),
173 _addr_reg(addr_reg), _addr(addr), _expected(expected), _new_val(new_val), _result(result), _tmp1(tmp1), _tmp2(tmp2), _cae(cae), _acquire(acquire), _release(release), _weak(weak) {}
174
175 public:
176 static ShenandoahCASBarrierSlowStubC2* create(const MachNode* node, Register addr, Register expected, Register new_val, Register result, Register tmp, bool cae, bool acquire, bool release, bool weak);
177 static ShenandoahCASBarrierSlowStubC2* create(const MachNode* node, Address addr, Register expected, Register new_val, Register result, Register tmp1, Register tmp2, bool cae);
178 void emit_code(MacroAssembler& masm) override;
179 };
180
181 class ShenandoahCASBarrierMidStubC2 : public ShenandoahBarrierStubC2 {
182 ShenandoahCASBarrierSlowStubC2* _slow_stub;
183 Register _expected;
184 Register _result;
185 Register _tmp;
186 bool _cae;
187 ShenandoahCASBarrierMidStubC2(const MachNode* node, ShenandoahCASBarrierSlowStubC2* slow_stub, Register expected, Register result, Register tmp, bool cae) :
188 ShenandoahBarrierStubC2(node), _slow_stub(slow_stub), _expected(expected), _result(result), _tmp(tmp), _cae(cae) {}
189 public:
190 static ShenandoahCASBarrierMidStubC2* create(const MachNode* node, ShenandoahCASBarrierSlowStubC2* slow_stub, Register expected, Register result, Register tmp, bool cae);
191 void emit_code(MacroAssembler& masm) override;
192 };
193
194 #endif // SHARE_GC_SHENANDOAH_C2_SHENANDOAHBARRIERSETC2_HPP