1 /*
2 * Copyright (c) 2016, 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.
22 *
23 */
24
25 #ifndef SHARE_VM_OPTO_VALUETYPENODE_HPP
26 #define SHARE_VM_OPTO_VALUETYPENODE_HPP
27
28 #include "opto/node.hpp"
29 #include "opto/connode.hpp"
30
31 class GraphKit;
32
33 class ValueTypeBaseNode : public TypeNode {
34 protected:
35 ValueTypeBaseNode(const Type* t, int nb_fields)
36 : TypeNode(t, nb_fields) {
37 init_class_id(Class_ValueTypeBase);
38 Compile::current()->add_value_type(this);
39 }
40
41 enum { Control, // Control input
42 Oop, // Oop of TypeInstPtr
43 Values // Nodes corresponding to values of the value type's fields.
44 // Nodes are connected in increasing order of the index of the field they correspond to.
45 };
46
47 virtual const TypeInstPtr* value_ptr() const = 0;
48 // Get the klass defining the field layout of the value type
49 virtual ciValueKlass* value_klass() const = 0;
50
51 int make_scalar_in_safepoint(Unique_Node_List& worklist, SafePointNode* sfpt, Node* root, PhaseGVN* gvn);
52
53 // Initialize the value type fields with the inputs or outputs of a MultiNode
54 void initialize(GraphKit* kit, MultiNode* multi, ciValueKlass* vk, int base_offset = 0, int base_input = TypeFunc::Parms+1, bool in = false);
55
56 const TypePtr* field_adr_type(Node* base, int offset, ciInstanceKlass* holder, PhaseGVN& gvn) const;
57
58 public:
59 // Support for control flow merges
60 bool has_phi_inputs(Node* region);
61 ValueTypeBaseNode* clone_with_phis(PhaseGVN* gvn, Node* region);
62 ValueTypeBaseNode* merge_with(PhaseGVN* gvn, const ValueTypeBaseNode* other, int pnum, bool transform);
63 void add_new_path(Node* region);
64
65 // Get oop for heap allocated value type (may be TypePtr::NULL_PTR)
66 Node* get_oop() const { return in(Oop); }
67 void set_oop(Node* oop) { set_req(Oop, oop); }
68
69 // Value type fields
70 uint field_count() const { return req() - Values; }
71 Node* field_value(uint index) const;
72 Node* field_value_by_offset(int offset, bool recursive = false) const;
73 void set_field_value(uint index, Node* value);
74 void set_field_value_by_offset(int offset, Node* value);
75 int field_offset(uint index) const;
76 ciType* field_type(uint index) const;
77 bool field_is_flattened(uint index) const;
78 bool field_is_flattenable(uint index) const;
79
80 // Replace ValueTypeNodes in debug info at safepoints with SafePointScalarObjectNodes
81 void make_scalar_in_safepoints(Node* root, PhaseGVN* gvn);
82
83 // Store the value type as a flattened (headerless) representation
84 void store_flattened(GraphKit* kit, Node* base, Node* ptr, ciInstanceKlass* holder = NULL, int holder_offset = 0) const;
85 // Store the field values to memory
86 void store(GraphKit* kit, Node* base, Node* ptr, ciInstanceKlass* holder, int holder_offset = 0, bool deoptimize_on_exception = false) const;
87 // Initialize the value type by loading its field values from memory
88 void load(GraphKit* kit, Node* base, Node* ptr, ciInstanceKlass* holder, int holder_offset = 0);
89
90 // Allocates the value type (if not yet allocated)
91 ValueTypeBaseNode* allocate(GraphKit* kit, bool deoptimize_on_exception = false);
92 bool is_allocated(PhaseGVN* phase) const;
93
94 void replace_call_results(GraphKit* kit, Node* call, Compile* C);
95 };
96
97 //------------------------------ValueTypeNode-------------------------------------
98 // Node representing a value type in C2 IR
99 class ValueTypeNode : public ValueTypeBaseNode {
100 friend class ValueTypeBaseNode;
101 friend class ValueTypePtrNode;
102 private:
103 ValueTypeNode(ciValueKlass* vk, Node* oop)
104 : ValueTypeBaseNode(TypeValueType::make(vk), Values + vk->nof_declared_nonstatic_fields()) {
105 init_class_id(Class_ValueType);
106 init_req(Oop, oop);
107 }
108
109 // Checks if the value type is loaded from memory and if so returns the oop
110 Node* is_loaded(PhaseGVN* phase, ciValueKlass* vk = NULL, Node* base = NULL, int holder_offset = 0);
111
112 // Checks if the value type fields are all set to default values
113 bool is_default(PhaseGVN& gvn) const;
114
115 const TypeInstPtr* value_ptr() const { return TypeInstPtr::make(TypePtr::BotPTR, value_klass()); }
116 ciValueKlass* value_klass() const { return type()->is_valuetype()->value_klass(); }
117
118 public:
119 // Create uninitialized
120 static ValueTypeNode* make_uninitialized(PhaseGVN& gvn, ciValueKlass* vk);
121 // Create with default field values
122 static ValueTypeNode* make_default(PhaseGVN& gvn, ciValueKlass* vk);
123 // Create and initialize by loading the field values from an oop
124 static ValueTypeNode* make_from_oop(GraphKit* kit, Node* oop, ciValueKlass* vk);
125 // Create and initialize by loading the field values from a flattened field or array
126 static ValueTypeNode* make_from_flattened(GraphKit* kit, ciValueKlass* vk, Node* obj, Node* ptr, ciInstanceKlass* holder = NULL, int holder_offset = 0);
127 // Create and initialize with the inputs or outputs of a MultiNode (method entry or call)
128 static ValueTypeNode* make_from_multi(GraphKit* kit, MultiNode* multi, ciValueKlass* vk, int base_input, bool in);
129
130 // Returns the constant oop of the default value type allocation
131 static Node* default_oop(PhaseGVN& gvn, ciValueKlass* vk);
132
133 // Allocate all non-flattened value type fields
134 Node* allocate_fields(GraphKit* kit);
135
136 Node* tagged_klass(PhaseGVN& gvn);
137 void pass_klass(Node* n, uint pos, const GraphKit& kit);
138 uint pass_fields(Node* call, int base_input, GraphKit& kit, bool assert_allocated = false, ciValueKlass* base_vk = NULL, int base_offset = 0);
139
140 // Allocation optimizations
141 void remove_redundant_allocations(PhaseIterGVN* igvn, PhaseIdealLoop* phase);
142
143 virtual Node* Ideal(PhaseGVN* phase, bool can_reshape);
144 virtual int Opcode() const;
145 };
146
147 //------------------------------ValueTypePtrNode-------------------------------------
148 // Node representing a value type as a pointer in C2 IR
149 class ValueTypePtrNode : public ValueTypeBaseNode {
150 private:
151 const TypeInstPtr* value_ptr() const { return type()->isa_instptr(); }
152 ciValueKlass* value_klass() const { return value_ptr()->value_klass(); }
153
154 ValueTypePtrNode(ciValueKlass* vk, Node* oop)
155 : ValueTypeBaseNode(TypeInstPtr::make(TypePtr::NotNull, vk), Values + vk->nof_declared_nonstatic_fields()) {
156 init_class_id(Class_ValueTypePtr);
157 init_req(Oop, oop);
158 }
159
160 public:
161 // Create and initialize with the values of a ValueTypeNode
162 static ValueTypePtrNode* make_from_value_type(GraphKit* kit, ValueTypeNode* vt, bool deoptimize_on_exception = false);
163 // Create and initialize by loading the field values from an oop
164 static ValueTypePtrNode* make_from_oop(GraphKit* kit, Node* oop);
165
166 virtual int Opcode() const;
167 };
168
169 #endif // SHARE_VM_OPTO_VALUETYPENODE_HPP