1 /*
2 * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 *
22 */
23
24 #ifndef SHARE_GC_SHENANDOAH_C2_SHENANDOAHBARRIERSETC2_HPP
25 #define SHARE_GC_SHENANDOAH_C2_SHENANDOAHBARRIERSETC2_HPP
26
27 #include "gc/shared/c2/barrierSetC2.hpp"
28 #include "gc/shenandoah/c2/shenandoahSupport.hpp"
29 #include "utilities/growableArray.hpp"
30
31 class ShenandoahBarrierSetC2State : public ResourceObj {
32 private:
33 GrowableArray<ShenandoahEnqueueBarrierNode*>* _enqueue_barriers;
34 GrowableArray<ShenandoahLoadReferenceBarrierNode*>* _load_reference_barriers;
35
36 public:
37 ShenandoahBarrierSetC2State(Arena* comp_arena);
38
39 int enqueue_barriers_count() const;
40 ShenandoahEnqueueBarrierNode* enqueue_barrier(int idx) const;
41 void add_enqueue_barrier(ShenandoahEnqueueBarrierNode* n);
42 void remove_enqueue_barrier(ShenandoahEnqueueBarrierNode * n);
43
44 int load_reference_barriers_count() const;
45 ShenandoahLoadReferenceBarrierNode* load_reference_barrier(int idx) const;
46 void add_load_reference_barrier(ShenandoahLoadReferenceBarrierNode* n);
47 void remove_load_reference_barrier(ShenandoahLoadReferenceBarrierNode * n);
48 };
49
50 class ShenandoahBarrierSetC2 : public BarrierSetC2 {
51 private:
52 void shenandoah_eliminate_wb_pre(Node* call, PhaseIterGVN* igvn) const;
53
54 bool satb_can_remove_pre_barrier(GraphKit* kit, PhaseTransform* phase, Node* adr,
55 BasicType bt, uint adr_idx) const;
56 void satb_write_barrier_pre(GraphKit* kit, bool do_load,
57 Node* obj,
58 Node* adr,
59 uint alias_idx,
60 Node* val,
61 const TypeOopPtr* val_type,
62 Node* pre_val,
63 BasicType bt) const;
64
65 void shenandoah_write_barrier_pre(GraphKit* kit,
66 bool do_load,
67 Node* obj,
68 Node* adr,
69 uint alias_idx,
70 Node* val,
71 const TypeOopPtr* val_type,
72 Node* pre_val,
73 BasicType bt) const;
74
75 Node* shenandoah_enqueue_barrier(GraphKit* kit, Node* val) const;
76 Node* shenandoah_storeval_barrier(GraphKit* kit, Node* obj) const;
77
78 void insert_pre_barrier(GraphKit* kit, Node* base_oop, Node* offset,
79 Node* pre_val, bool need_mem_bar) const;
80
81 static bool clone_needs_barrier(Node* src, PhaseGVN& gvn);
82
83 protected:
84 virtual Node* load_at_resolved(C2Access& access, const Type* val_type) const;
85 virtual Node* store_at_resolved(C2Access& access, C2AccessValue& val) const;
86 virtual Node* atomic_cmpxchg_val_at_resolved(C2AtomicAccess& access, Node* expected_val,
87 Node* new_val, const Type* val_type) const;
88 virtual Node* atomic_cmpxchg_bool_at_resolved(C2AtomicAccess& access, Node* expected_val,
89 Node* new_val, const Type* value_type) const;
90 virtual Node* atomic_xchg_at_resolved(C2AtomicAccess& access, Node* new_val, const Type* val_type) const;
91
92 public:
93 static ShenandoahBarrierSetC2* bsc2();
94
95 static bool is_shenandoah_wb_pre_call(Node* call);
96 static bool is_shenandoah_lrb_call(Node* call);
97 static bool is_shenandoah_marking_if(PhaseTransform *phase, Node* n);
98 static bool is_shenandoah_state_load(Node* n);
99 static bool has_only_shenandoah_wb_pre_uses(Node* n);
100
101 ShenandoahBarrierSetC2State* state() const;
102
103 static const TypeFunc* write_ref_field_pre_entry_Type();
104 static const TypeFunc* shenandoah_clone_barrier_Type();
105 static const TypeFunc* shenandoah_load_reference_barrier_Type();
106 virtual bool has_load_barriers() const { return true; }
107
108 // This is the entry-point for the backend to perform accesses through the Access API.
109 virtual void clone_at_expansion(PhaseMacroExpand* phase, ArrayCopyNode* ac) const;
110
111 // These are general helper methods used by C2
112 virtual bool array_copy_requires_gc_barriers(BasicType type) const;
113
114 // Support for GC barriers emitted during parsing
115 virtual bool is_gc_barrier_node(Node* node) const;
116 virtual Node* step_over_gc_barrier(Node* c) const;
117 virtual bool expand_barriers(Compile* C, PhaseIterGVN& igvn) const;
118 virtual bool optimize_loops(PhaseIdealLoop* phase, LoopOptsMode mode, VectorSet& visited, Node_Stack& nstack, Node_List& worklist) const;
119 virtual bool strip_mined_loops_expanded(LoopOptsMode mode) const { return mode == LoopOptsShenandoahExpand || mode == LoopOptsShenandoahPostExpand; }
120 virtual bool is_gc_specific_loop_opts_pass(LoopOptsMode mode) const { return mode == LoopOptsShenandoahExpand || mode == LoopOptsShenandoahPostExpand; }
121
122 // Support for macro expanded GC barriers
123 virtual void register_potential_barrier_node(Node* node) const;
124 virtual void unregister_potential_barrier_node(Node* node) const;
125 virtual void eliminate_gc_barrier(PhaseMacroExpand* macro, Node* node) const;
126 virtual void enqueue_useful_gc_barrier(Unique_Node_List &worklist, Node* node) const;
127 virtual void eliminate_useless_gc_barriers(Unique_Node_List &useful) const;
128 virtual void add_users_to_worklist(Unique_Node_List* worklist) const;
129
130 // Allow barrier sets to have shared state that is preserved across a compilation unit.
131 // This could for example comprise macro nodes to be expanded during macro expansion.
132 virtual void* create_barrier_state(Arena* comp_arena) const;
133 // If the BarrierSetC2 state has kept macro nodes in its compilation unit state to be
134 // expanded later, then now is the time to do so.
135 virtual bool expand_macro_nodes(PhaseMacroExpand* macro) const;
136
137 #ifdef ASSERT
138 virtual void verify_gc_barriers(bool post_parse) const;
139 #endif
140
141 virtual Node* ideal_node(PhaseGVN* phase, Node* n, bool can_reshape) const;
142
143 Node* arraycopy_load_reference_barrier(PhaseGVN *phase, Node* v);
144
145 };
146
147 #endif // SHARE_GC_SHENANDOAH_C2_SHENANDOAHBARRIERSETC2_HPP