1 /*
2 * Copyright (c) 2016, 2024, 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.
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24
25 #ifndef SHARE_VM_OPTO_INLINETYPENODE_HPP
26 #define SHARE_VM_OPTO_INLINETYPENODE_HPP
27
28 #include "gc/shared/c2/barrierSetC2.hpp"
29 #include "opto/connode.hpp"
30 #include "opto/loopnode.hpp"
31 #include "opto/node.hpp"
32
33 class GraphKit;
34
35 //------------------------------InlineTypeNode-------------------------------------
36 // Node representing an inline type in C2 IR
37 class InlineTypeNode : public TypeNode {
38 protected:
39 InlineTypeNode(ciInlineKlass* vk, Node* oop, bool null_free)
40 : TypeNode(TypeInstPtr::make(null_free ? TypePtr::NotNull : TypePtr::BotPTR, vk), Values + vk->nof_declared_nonstatic_fields()) {
41 init_class_id(Class_InlineType);
42 init_req(Oop, oop);
43 Compile::current()->add_inline_type(this);
44 _is_larval = false;
45 }
46
47 enum { Control, // Control input.
48 Oop, // Oop to heap allocated buffer.
49 IsBuffered, // True if inline type is heap allocated (or nullptr), false otherwise.
50 IsInit, // Needs to be checked for nullptr before using the field values.
51 Values // Nodes corresponding to values of the inline type's fields.
52 // Nodes are connected in increasing order of the index of the field they correspond to.
53 };
54
55 bool _is_larval;
56
57 virtual uint hash() const { return TypeNode::hash() + _is_larval; }
58 // Don't GVN larvals because the inputs might be updated
59 virtual bool cmp(const Node &n) const { return TypeNode::cmp(n) && !(n.isa_InlineType()->_is_larval || _is_larval); }
60 virtual uint size_of() const { return sizeof(*this); }
61
62 // Get the klass defining the field layout of the inline type
63 ciInlineKlass* inline_klass() const { return type()->inline_klass(); }
64
65 void make_scalar_in_safepoint(PhaseIterGVN* igvn, Unique_Node_List& worklist, SafePointNode* sfpt);
66
67 const TypePtr* field_adr_type(Node* base, int offset, ciInstanceKlass* holder, DecoratorSet decorators, PhaseGVN& gvn) const;
68
69 // Checks if the inline type fields are all set to default values
70 bool is_default(PhaseGVN* gvn) const;
71
72 // Checks if the inline type oop is an allocated buffer with larval state
73 bool is_larval(PhaseGVN* gvn) const;
74
75 // Checks if the inline type is loaded from memory and if so returns the oop
76 Node* is_loaded(PhaseGVN* phase, ciInlineKlass* vk = nullptr, Node* base = nullptr, int holder_offset = 0);
77
78 // Initialize the inline type fields with the inputs or outputs of a MultiNode
79 void initialize_fields(GraphKit* kit, MultiNode* multi, uint& base_input, bool in, bool null_free, Node* null_check_region, GrowableArray<ciType*>& visited);
80
81 InlineTypeNode* adjust_scalarization_depth_impl(GraphKit* kit, GrowableArray<ciType*>& visited);
82
83 static InlineTypeNode* make_default_impl(PhaseGVN& gvn, ciInlineKlass* vk, GrowableArray<ciType*>& visited, bool is_larval = false);
84 static InlineTypeNode* make_from_oop_impl(GraphKit* kit, Node* oop, ciInlineKlass* vk, bool null_free, GrowableArray<ciType*>& visited, bool is_larval = false);
85 static InlineTypeNode* make_null_impl(PhaseGVN& gvn, ciInlineKlass* vk, GrowableArray<ciType*>& visited, bool transform = true);
86 static InlineTypeNode* make_from_flat_impl(GraphKit* kit, ciInlineKlass* vk, Node* obj, Node* ptr, ciInstanceKlass* holder, int holder_offset, DecoratorSet decorators, GrowableArray<ciType*>& visited);
87
88 public:
89 // Create with default field values
90 static InlineTypeNode* make_default(PhaseGVN& gvn, ciInlineKlass* vk, bool is_larval = false);
91 // Create uninitialized
92 static InlineTypeNode* make_uninitialized(PhaseGVN& gvn, ciInlineKlass* vk, bool null_free = true);
93 // Create and initialize by loading the field values from an oop
94 static InlineTypeNode* make_from_oop(GraphKit* kit, Node* oop, ciInlineKlass* vk, bool null_free = true, bool is_larval = false);
95 // Create and initialize by loading the field values from a flat field or array
96 static InlineTypeNode* make_from_flat(GraphKit* kit, ciInlineKlass* vk, Node* obj, Node* ptr, ciInstanceKlass* holder = nullptr, int holder_offset = 0, DecoratorSet decorators = IN_HEAP | MO_UNORDERED);
97 // Create and initialize with the inputs or outputs of a MultiNode (method entry or call)
98 static InlineTypeNode* make_from_multi(GraphKit* kit, MultiNode* multi, ciInlineKlass* vk, uint& base_input, bool in, bool null_free = true);
99 // Create with null field values
100 static InlineTypeNode* make_null(PhaseGVN& gvn, ciInlineKlass* vk, bool transform = true);
101
102 // Returns the constant oop of the default inline type allocation
103 static Node* default_oop(PhaseGVN& gvn, ciInlineKlass* vk);
104
105 // Support for control flow merges
106 bool has_phi_inputs(Node* region);
107 InlineTypeNode* clone_with_phis(PhaseGVN* gvn, Node* region, SafePointNode* map = nullptr, bool is_init = false);
108 InlineTypeNode* merge_with(PhaseGVN* gvn, const InlineTypeNode* other, int pnum, bool transform);
109 void add_new_path(Node* region);
110
111 // Get oop for heap allocated inline type (may be TypePtr::NULL_PTR)
112 Node* get_oop() const { return in(Oop); }
113 void set_oop(PhaseGVN& gvn, Node* oop) { set_req_X(Oop, oop, &gvn); }
114 Node* get_is_init() const { return in(IsInit); }
115 void set_is_init(PhaseGVN& gvn, bool init = true) { set_req_X(IsInit, gvn.intcon(init ? 1 : 0), &gvn); }
116 Node* get_is_buffered() const { return in(IsBuffered); }
117 void set_is_buffered(PhaseGVN& gvn, bool buffered = true) { set_req_X(IsBuffered, gvn.intcon(buffered ? 1 : 0), &gvn); }
118
119 void set_is_larval(bool is_larval) { _is_larval = is_larval; }
120 bool is_larval() const { return _is_larval; }
121
122 // Inline type fields
123 uint field_count() const { return req() - Values; }
124 Node* field_value(uint index) const;
125 Node* field_value_by_offset(int offset, bool recursive = false) const;
126 void set_field_value(uint index, Node* value);
127 void set_field_value_by_offset(int offset, Node* value);
128 int field_offset(uint index) const;
129 uint field_index(int offset) const;
130 ciType* field_type(uint index) const;
131 bool field_is_flat(uint index) const;
132 bool field_is_null_free(uint index) const;
133
134 // Replace InlineTypeNodes in debug info at safepoints with SafePointScalarObjectNodes
135 void make_scalar_in_safepoints(PhaseIterGVN* igvn, bool allow_oop = true);
136
137 // Store the inline type as a flat (headerless) representation
138 void store_flat(GraphKit* kit, Node* base, Node* ptr, ciInstanceKlass* holder, int holder_offset, DecoratorSet decorators) const;
139 // Store the field values to memory
140 void store(GraphKit* kit, Node* base, Node* ptr, ciInstanceKlass* holder, int holder_offset = 0, int offset = -1, DecoratorSet decorators = C2_TIGHTLY_COUPLED_ALLOC | IN_HEAP | MO_UNORDERED) const;
141 // Initialize the inline type by loading its field values from memory
142 void load(GraphKit* kit, Node* base, Node* ptr, ciInstanceKlass* holder, GrowableArray<ciType*>& visited, int holder_offset = 0, DecoratorSet decorators = IN_HEAP | MO_UNORDERED);
143 // Make sure that inline type is fully scalarized
144 InlineTypeNode* adjust_scalarization_depth(GraphKit* kit);
145
146 // Allocates the inline type (if not yet allocated)
147 InlineTypeNode* buffer(GraphKit* kit, bool safe_for_replace = true, bool must_init = true);
148 bool is_allocated(PhaseGVN* phase) const;
149
150 void replace_call_results(GraphKit* kit, CallNode* call, Compile* C);
151
152 // Allocate all non-flat inline type fields
153 Node* allocate_fields(GraphKit* kit);
154
155 Node* tagged_klass(PhaseGVN& gvn) {
156 return tagged_klass(inline_klass(), gvn);
157 }
158 static Node* tagged_klass(ciInlineKlass* vk, PhaseGVN& gvn);
159 // Pass inline type as fields at a call or return
160 void pass_fields(GraphKit* kit, Node* n, uint& base_input, bool in, bool null_free = true);
161
162 InlineTypeNode* make_larval(GraphKit* kit, bool allocate) const;
163 InlineTypeNode* finish_larval(GraphKit* kit) const;
164
165 // Allocation optimizations
166 void remove_redundant_allocations(PhaseIdealLoop* phase);
167
168 InlineTypeNode* clone_if_required(PhaseGVN* gvn, SafePointNode* map, bool safe_for_replace = true);
169
170 virtual const Type* Value(PhaseGVN* phase) const;
171
172 virtual Node* Ideal(PhaseGVN* phase, bool can_reshape);
173
174 virtual int Opcode() const;
175
176 NOT_PRODUCT(void dump_spec(outputStream* st) const;)
177 };
178
179 #endif // SHARE_VM_OPTO_INLINETYPENODE_HPP