1 /*
2 * Copyright (c) 2016, 2025, 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
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7 * published by the Free Software Foundation.
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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 *
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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 }
45
46 enum { Control, // Control input.
47 Oop, // Oop to heap allocated buffer.
48 IsBuffered, // True if inline type is heap allocated (or nullptr), false otherwise.
49 IsInit, // Needs to be checked for nullptr before using the field values.
50 Values // Nodes corresponding to values of the inline type's fields.
51 // Nodes are connected in increasing order of the index of the field they correspond to.
52 };
53
54 // Get the klass defining the field layout of the inline type
55 ciInlineKlass* inline_klass() const { return type()->inline_klass(); }
56
57 void make_scalar_in_safepoint(PhaseIterGVN* igvn, Unique_Node_List& worklist, SafePointNode* sfpt);
58 uint add_fields_to_safepoint(Unique_Node_List& worklist, Node_List& null_markers, SafePointNode* sfpt);
59
60 const TypePtr* field_adr_type(Node* base, int offset, ciInstanceKlass* holder, DecoratorSet decorators, PhaseGVN& gvn) const;
61
62 // Checks if the inline type is loaded from memory and if so returns the oop
63 Node* is_loaded(PhaseGVN* phase, ciInlineKlass* vk = nullptr, Node* base = nullptr, int holder_offset = 0);
64
65 // Initialize the inline type fields with the inputs or outputs of a MultiNode
66 void initialize_fields(GraphKit* kit, MultiNode* multi, uint& base_input, bool in, bool null_free, Node* null_check_region, GrowableArray<ciType*>& visited);
67
68 InlineTypeNode* adjust_scalarization_depth_impl(GraphKit* kit, GrowableArray<ciType*>& visited);
69
70 static InlineTypeNode* make_all_zero_impl(PhaseGVN& gvn, ciInlineKlass* vk, GrowableArray<ciType*>& visited);
71 static InlineTypeNode* make_from_oop_impl(GraphKit* kit, Node* oop, ciInlineKlass* vk, GrowableArray<ciType*>& visited);
72 static InlineTypeNode* make_null_impl(PhaseGVN& gvn, ciInlineKlass* vk, GrowableArray<ciType*>& visited, bool transform = true);
73 static InlineTypeNode* make_from_flat_impl(GraphKit* kit, ciInlineKlass* vk, Node* obj, Node* ptr, Node* idx, ciInstanceKlass* holder, int holder_offset, bool atomic, int null_marker_offset, DecoratorSet decorators, GrowableArray<ciType*>& visited);
74
75 void convert_from_payload(GraphKit* kit, BasicType bt, Node* payload, int holder_offset, bool null_free, int null_marker_offset);
76 Node* convert_to_payload(GraphKit* kit, BasicType bt, Node* payload, int holder_offset, bool null_free, int null_marker_offset, int& oop_off_1, int& oop_off_2) const;
77
78 public:
79 // Create with all-zero field values
80 static InlineTypeNode* make_all_zero(PhaseGVN& gvn, ciInlineKlass* vk);
81 // Create uninitialized
82 static InlineTypeNode* make_uninitialized(PhaseGVN& gvn, ciInlineKlass* vk, bool null_free = true);
83 // Create and initialize by loading the field values from an oop
84 static InlineTypeNode* make_from_oop(GraphKit* kit, Node* oop, ciInlineKlass* vk);
85 // Create and initialize by loading the field values from a flat field or array
86 static InlineTypeNode* make_from_flat(GraphKit* kit, ciInlineKlass* vk, Node* obj, Node* ptr, Node* idx, ciInstanceKlass* holder = nullptr, int holder_offset = 0,
87 bool atomic = false, int null_marker_offset = -1, DecoratorSet decorators = IN_HEAP | MO_UNORDERED);
88 // Create and initialize with the inputs or outputs of a MultiNode (method entry or call)
89 static InlineTypeNode* make_from_multi(GraphKit* kit, MultiNode* multi, ciInlineKlass* vk, uint& base_input, bool in, bool null_free = true);
90 // Create with null field values
91 static InlineTypeNode* make_null(PhaseGVN& gvn, ciInlineKlass* vk, bool transform = true);
92
93 // Support for control flow merges
94 bool has_phi_inputs(Node* region);
95 InlineTypeNode* clone_with_phis(PhaseGVN* gvn, Node* region, SafePointNode* map = nullptr, bool is_init = false);
96 InlineTypeNode* merge_with(PhaseGVN* gvn, const InlineTypeNode* other, int pnum, bool transform);
97 void add_new_path(Node* region);
98
99 // Get oop for heap allocated inline type (may be TypePtr::NULL_PTR)
100 Node* get_oop() const { return in(Oop); }
101 void set_oop(PhaseGVN& gvn, Node* oop) { set_req_X(Oop, oop, &gvn); }
102 Node* get_is_init() const { return in(IsInit); }
103 void set_is_init(PhaseGVN& gvn, bool init = true) { set_req_X(IsInit, gvn.intcon(init ? 1 : 0), &gvn); }
104 Node* get_is_buffered() const { return in(IsBuffered); }
105 void set_is_buffered(PhaseGVN& gvn, bool buffered = true) { set_req_X(IsBuffered, gvn.intcon(buffered ? 1 : 0), &gvn); }
106
107 // Checks if the inline type fields are all set to zero
108 bool is_all_zero(PhaseGVN* gvn, bool flat = false) const;
109
110 // Inline type fields
111 uint field_count() const { return req() - Values; }
112 Node* field_value(uint index) const;
113 Node* field_value_by_offset(int offset, bool recursive) const;
114 void set_field_value(uint index, Node* value);
115 void set_field_value_by_offset(int offset, Node* value);
116 int field_offset(uint index) const;
117 uint field_index(int offset) const;
118 ciType* field_type(uint index) const;
119 bool field_is_flat(uint index) const;
120 bool field_is_null_free(uint index) const;
121 bool field_is_volatile(uint index) const;
122 int field_null_marker_offset(uint index) const;
123
124 // Replace InlineTypeNodes in debug info at safepoints with SafePointScalarObjectNodes
125 void make_scalar_in_safepoints(PhaseIterGVN* igvn, bool allow_oop = true);
126
127 // Store the inline type as a flat (headerless) representation
128 void store_flat(GraphKit* kit, Node* base, Node* ptr, Node* idx, ciInstanceKlass* holder, int holder_offset, bool atomic, int null_marker_offset, DecoratorSet decorators) const;
129 // Store the field values to memory
130 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;
131 // Initialize the inline type by loading its field values from memory
132 void load(GraphKit* kit, Node* base, Node* ptr, ciInstanceKlass* holder, GrowableArray<ciType*>& visited, int holder_offset = 0, DecoratorSet decorators = IN_HEAP | MO_UNORDERED);
133 // Make sure that inline type is fully scalarized
134 InlineTypeNode* adjust_scalarization_depth(GraphKit* kit);
135
136 // Allocates the inline type (if not yet allocated)
137 InlineTypeNode* buffer(GraphKit* kit, bool safe_for_replace = true);
138 bool is_allocated(PhaseGVN* phase) const;
139
140 void replace_call_results(GraphKit* kit, CallNode* call, Compile* C);
141 void replace_field_projs(Compile* C, CallNode* call, uint& proj_idx);
142
143 // Allocate all non-flat inline type fields
144 Node* allocate_fields(GraphKit* kit);
145
146 Node* tagged_klass(PhaseGVN& gvn) {
147 return tagged_klass(inline_klass(), gvn);
148 }
149 static Node* tagged_klass(ciInlineKlass* vk, PhaseGVN& gvn);
150 // Pass inline type as fields at a call or return
151 void pass_fields(GraphKit* kit, Node* n, uint& base_input, bool in, bool null_free = true);
152
153 // Allocation optimizations
154 void remove_redundant_allocations(PhaseIdealLoop* phase);
155
156 InlineTypeNode* clone_if_required(PhaseGVN* gvn, SafePointNode* map, bool safe_for_replace = true);
157
158 virtual const Type* Value(PhaseGVN* phase) const;
159
160 virtual Node* Ideal(PhaseGVN* phase, bool can_reshape);
161
162 virtual int Opcode() const;
163 };
164
165 #endif // SHARE_VM_OPTO_INLINETYPENODE_HPP