1 /*
2 * Copyright (c) 2016, 2023, 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.
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23 */
24
25 #ifndef SHARE_OPTO_ARRAYCOPYNODE_HPP
26 #define SHARE_OPTO_ARRAYCOPYNODE_HPP
27
28 #include "gc/shared/c2/barrierSetC2.hpp"
29 #include "opto/callnode.hpp"
30
31 class GraphKit;
32
33 class ArrayCopyNode : public CallNode {
34 private:
35
36 // What kind of arraycopy variant is this?
37 enum {
38 None, // not set yet
39 ArrayCopy, // System.arraycopy()
40 CloneInst, // A clone of instances
41 CloneArray, // A clone of arrays that don't require a barrier
42 // - depends on GC - some need to treat oop arrays separately
43 CloneOopArray, // An oop array clone that requires GC barriers
44 CopyOf, // Arrays.copyOf()
45 CopyOfRange // Arrays.copyOfRange()
46 } _kind;
47
48 #ifndef PRODUCT
49 static const char* _kind_names[CopyOfRange+1];
50 #endif
51 // Is the alloc obtained with
52 // AllocateArrayNode::Ideal_array_allocation() tightly coupled
53 // (arraycopy follows immediately the allocation)?
54 // We cache the result of LibraryCallKit::tightly_coupled_allocation
55 // here because it's much easier to find whether there's a tightly
56 // couple allocation at parse time than at macro expansion time. At
57 // macro expansion time, for every use of the allocation node we
58 // would need to figure out whether it happens after the arraycopy (and
59 // can be ignored) or between the allocation and the arraycopy. At
60 // parse time, it's straightforward because whatever happens after
61 // the arraycopy is not parsed yet so doesn't exist when
62 // LibraryCallKit::tightly_coupled_allocation() is called.
63 bool _alloc_tightly_coupled;
64 bool _has_negative_length_guard;
65
66 bool _arguments_validated;
67
68 static const TypeFunc* arraycopy_type() {
69 const Type** fields = TypeTuple::fields(ParmLimit - TypeFunc::Parms);
70 fields[Src] = TypeInstPtr::BOTTOM;
71 fields[SrcPos] = TypeInt::INT;
72 fields[Dest] = TypeInstPtr::BOTTOM;
73 fields[DestPos] = TypeInt::INT;
74 fields[Length] = TypeInt::INT;
75 fields[SrcLen] = TypeInt::INT;
76 fields[DestLen] = TypeInt::INT;
77 fields[SrcKlass] = TypeKlassPtr::BOTTOM;
78 fields[DestKlass] = TypeKlassPtr::BOTTOM;
79 const TypeTuple *domain = TypeTuple::make(ParmLimit, fields);
80
81 // create result type (range)
82 fields = TypeTuple::fields(0);
83
84 const TypeTuple *range = TypeTuple::make(TypeFunc::Parms+0, fields);
85
86 return TypeFunc::make(domain, range);
87 }
88
89 ArrayCopyNode(Compile* C, bool alloc_tightly_coupled, bool has_negative_length_guard);
90
91 intptr_t get_length_if_constant(PhaseGVN *phase) const;
92 int get_count(PhaseGVN *phase) const;
93 static const TypeAryPtr* get_address_type(PhaseGVN* phase, const TypePtr* atp, Node* n);
94
95 Node* try_clone_instance(PhaseGVN *phase, bool can_reshape, int count);
96 bool prepare_array_copy(PhaseGVN *phase, bool can_reshape,
97 Node*& adr_src, Node*& base_src, Node*& adr_dest, Node*& base_dest,
98 BasicType& copy_type, const Type*& value_type, bool& disjoint_bases);
99 void array_copy_test_overlap(GraphKit& kit,
100 bool disjoint_bases, int count,
101 Node*& backward_ctl);
102 void array_copy_forward(GraphKit& kit, bool can_reshape,
103 const TypeAryPtr* atp_src, const TypeAryPtr* atp_dest,
104 Node* adr_src, Node* base_src, Node* adr_dest, Node* base_dest,
105 BasicType copy_type, const Type* value_type, int count);
106 void array_copy_backward(GraphKit& kit, bool can_reshape,
107 const TypeAryPtr* atp_src, const TypeAryPtr* atp_dest,
108 Node* adr_src, Node* base_src, Node* adr_dest, Node* base_dest,
109 BasicType copy_type, const Type* value_type, int count);
110 bool finish_transform(PhaseGVN *phase, bool can_reshape,
111 Node* ctl, Node *mem);
112 void copy(GraphKit& kit, const TypeAryPtr* atp_src, const TypeAryPtr* atp_dest, int i,
113 Node* base_src, Node* base_dest, Node* adr_src, Node* adr_dest,
114 BasicType copy_type, const Type* value_type);
115
116 static bool may_modify_helper(const TypeOopPtr* t_oop, Node* n, PhaseValues* phase, CallNode*& call);
117 public:
118 static Node* load(BarrierSetC2* bs, PhaseGVN *phase, Node*& ctl, MergeMemNode* mem, Node* addr, const TypePtr* adr_type, const Type *type, BasicType bt);
119 private:
120 void store(BarrierSetC2* bs, PhaseGVN *phase, Node*& ctl, MergeMemNode* mem, Node* addr, const TypePtr* adr_type, Node* val, const Type *type, BasicType bt);
121
122 public:
123
124 enum {
125 Src = TypeFunc::Parms,
126 SrcPos,
127 Dest,
128 DestPos,
129 Length,
130 SrcLen,
131 DestLen,
132 SrcKlass,
133 DestKlass,
134 ParmLimit
135 };
136
137 // Results from escape analysis for non escaping inputs
138 const TypeOopPtr* _src_type;
139 const TypeOopPtr* _dest_type;
140
141 static ArrayCopyNode* make(GraphKit* kit, bool may_throw,
142 Node* src, Node* src_offset,
143 Node* dest, Node* dest_offset,
144 Node* length,
145 bool alloc_tightly_coupled,
146 bool has_negative_length_guard,
147 Node* src_klass = nullptr, Node* dest_klass = nullptr,
148 Node* src_length = nullptr, Node* dest_length = nullptr);
149
150 void connect_outputs(GraphKit* kit, bool deoptimize_on_exception = false);
151
152 bool is_arraycopy() const { assert(_kind != None, "should bet set"); return _kind == ArrayCopy; }
153 bool is_arraycopy_validated() const { assert(_kind != None, "should bet set"); return _kind == ArrayCopy && _arguments_validated; }
154 bool is_clone_inst() const { assert(_kind != None, "should bet set"); return _kind == CloneInst; }
155 // is_clone_array - true for all arrays when using GCs that has no barriers
156 bool is_clone_array() const { assert(_kind != None, "should bet set"); return _kind == CloneArray; }
157 // is_clone_oop_array is used when oop arrays need GC barriers
158 bool is_clone_oop_array() const { assert(_kind != None, "should bet set"); return _kind == CloneOopArray; }
159 // is_clonebasic - is true for any type of clone that doesn't need a writebarrier.
160 bool is_clonebasic() const { assert(_kind != None, "should bet set"); return _kind == CloneInst || _kind == CloneArray; }
161 bool is_copyof() const { assert(_kind != None, "should bet set"); return _kind == CopyOf; }
162 bool is_copyof_validated() const { assert(_kind != None, "should bet set"); return _kind == CopyOf && _arguments_validated; }
163 bool is_copyofrange() const { assert(_kind != None, "should bet set"); return _kind == CopyOfRange; }
164 bool is_copyofrange_validated() const { assert(_kind != None, "should bet set"); return _kind == CopyOfRange && _arguments_validated; }
165
166 void set_arraycopy(bool validated) { assert(_kind == None, "shouldn't bet set yet"); _kind = ArrayCopy; _arguments_validated = validated; }
167 void set_clone_inst() { assert(_kind == None, "shouldn't bet set yet"); _kind = CloneInst; }
168 void set_clone_array() { assert(_kind == None, "shouldn't bet set yet"); _kind = CloneArray; }
169 void set_clone_oop_array() { assert(_kind == None, "shouldn't bet set yet"); _kind = CloneOopArray; }
170 void set_copyof(bool validated) { assert(_kind == None, "shouldn't bet set yet"); _kind = CopyOf; _arguments_validated = validated; }
171 void set_copyofrange(bool validated) { assert(_kind == None, "shouldn't bet set yet"); _kind = CopyOfRange; _arguments_validated = validated; }
172
173 virtual int Opcode() const;
174 virtual uint size_of() const; // Size is bigger
175 virtual bool guaranteed_safepoint() { return false; }
176 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
177
178 virtual bool may_modify(const TypeOopPtr* t_oop, PhaseValues* phase);
179
180 bool is_alloc_tightly_coupled() const { return _alloc_tightly_coupled; }
181
182 bool has_negative_length_guard() const { return _has_negative_length_guard; }
183
184 static bool may_modify(const TypeOopPtr* t_oop, MemBarNode* mb, PhaseValues* phase, ArrayCopyNode*& ac);
185
186 static int get_partial_inline_vector_lane_count(BasicType type, int const_len);
187
188 bool modifies(intptr_t offset_lo, intptr_t offset_hi, PhaseValues* phase, bool must_modify) const;
189
190 #ifndef PRODUCT
191 virtual void dump_spec(outputStream *st) const;
192 virtual void dump_compact_spec(outputStream* st) const;
193 #endif
194 };
195 #endif // SHARE_OPTO_ARRAYCOPYNODE_HPP