1 /*
2 * Copyright (c) 2014, 2019, 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_OPTO_CASTNODE_HPP
26 #define SHARE_OPTO_CASTNODE_HPP
27
28 #include "opto/node.hpp"
29 #include "opto/opcodes.hpp"
30
31
32 //------------------------------ConstraintCastNode-----------------------------
33 // cast to a different range
34 class ConstraintCastNode: public TypeNode {
35 public:
36 enum DependencyType {
37 RegularDependency, // if cast doesn't improve input type, cast can be removed
38 StrongDependency, // leave cast in even if _type doesn't improve input type, can be replaced by stricter dominating cast if one exist
39 UnconditionalDependency // leave cast in unconditionally
40 };
41
42 protected:
43 const DependencyType _dependency;
44 virtual bool cmp( const Node &n ) const;
45 virtual uint size_of() const;
46
47 public:
48 ConstraintCastNode(Node *n, const Type *t, DependencyType dependency)
49 : TypeNode(t,2), _dependency(dependency) {
50 init_class_id(Class_ConstraintCast);
51 init_req(1, n);
52 }
53 virtual Node* Identity(PhaseGVN* phase);
54 virtual const Type* Value(PhaseGVN* phase) const;
55 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
56 virtual int Opcode() const;
57 virtual uint ideal_reg() const = 0;
58 virtual bool depends_only_on_test() const { return _dependency == RegularDependency; }
59 bool carry_dependency() const { return _dependency != RegularDependency; }
60 TypeNode* dominating_cast(PhaseGVN* gvn, PhaseTransform* pt) const;
61 static Node* make_cast(int opcode, Node* c, Node *n, const Type *t, DependencyType dependency);
62 static Node* make(Node* c, Node *n, const Type *t, BasicType bt);
63
64 #ifndef PRODUCT
65 virtual void dump_spec(outputStream *st) const;
66 #endif
67
68 static Node* make_cast_for_type(Node* c, Node* in, const Type* type, DependencyType dependency);
69 };
70
71 //------------------------------CastIINode-------------------------------------
72 // cast integer to integer (different range)
73 class CastIINode: public ConstraintCastNode {
74 protected:
75 // Is this node dependent on a range check?
76 const bool _range_check_dependency;
77 virtual bool cmp(const Node &n) const;
78 virtual uint size_of() const;
79
80 public:
81 CastIINode(Node* n, const Type* t, DependencyType dependency = RegularDependency, bool range_check_dependency = false)
82 : ConstraintCastNode(n, t, dependency), _range_check_dependency(range_check_dependency) {
83 init_class_id(Class_CastII);
84 }
85 CastIINode(Node* ctrl, Node* n, const Type* t, DependencyType dependency = RegularDependency, bool range_check_dependency = false)
86 : ConstraintCastNode(n, t, dependency), _range_check_dependency(range_check_dependency) {
87 init_class_id(Class_CastII);
88 init_req(0, ctrl);
89 }
90 virtual int Opcode() const;
91 virtual uint ideal_reg() const { return Op_RegI; }
92 virtual Node* Identity(PhaseGVN* phase);
93 virtual const Type* Value(PhaseGVN* phase) const;
94 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
95 const bool has_range_check() {
96 #ifdef _LP64
97 return _range_check_dependency;
98 #else
99 assert(!_range_check_dependency, "Should not have range check dependency");
100 return false;
101 #endif
102 }
103
104 #ifndef PRODUCT
105 virtual void dump_spec(outputStream* st) const;
106 #endif
107 };
108
109 class CastLLNode: public ConstraintCastNode {
110 public:
111 CastLLNode(Node* ctrl, Node* n, const Type* t, DependencyType dependency = RegularDependency)
112 : ConstraintCastNode(n, t, dependency) {
113 init_class_id(Class_CastLL);
114 init_req(0, ctrl);
115 }
116 CastLLNode(Node* n, const Type* t, DependencyType dependency = RegularDependency)
117 : ConstraintCastNode(n, t, dependency){
118 init_class_id(Class_CastLL);
119 }
120
121 virtual int Opcode() const;
122 virtual uint ideal_reg() const { return Op_RegL; }
123 };
124
125 class CastFFNode: public ConstraintCastNode {
126 public:
127 CastFFNode(Node* n, const Type* t, DependencyType dependency = RegularDependency)
128 : ConstraintCastNode(n, t, dependency){
129 init_class_id(Class_CastFF);
130 }
131 virtual int Opcode() const;
132 virtual uint ideal_reg() const { return in(1)->ideal_reg(); }
133 };
134
135 class CastDDNode: public ConstraintCastNode {
136 public:
137 CastDDNode(Node* n, const Type* t, DependencyType dependency = RegularDependency)
138 : ConstraintCastNode(n, t, dependency){
139 init_class_id(Class_CastDD);
140 }
141 virtual int Opcode() const;
142 virtual uint ideal_reg() const { return in(1)->ideal_reg(); }
143 };
144
145 class CastVVNode: public ConstraintCastNode {
146 public:
147 CastVVNode(Node* n, const Type* t, DependencyType dependency = RegularDependency)
148 : ConstraintCastNode(n, t, dependency){
149 init_class_id(Class_CastVV);
150 }
151 virtual int Opcode() const;
152 virtual uint ideal_reg() const { return in(1)->ideal_reg(); }
153 };
154
155
156 //------------------------------CastPPNode-------------------------------------
157 // cast pointer to pointer (different type)
158 class CastPPNode: public ConstraintCastNode {
159 public:
160 CastPPNode (Node *n, const Type *t, DependencyType dependency = RegularDependency)
161 : ConstraintCastNode(n, t, dependency) {
162 }
163 virtual int Opcode() const;
164 virtual uint ideal_reg() const { return Op_RegP; }
165 };
166
167 //------------------------------CheckCastPPNode--------------------------------
168 // for _checkcast, cast pointer to pointer (different type), without JOIN,
169 class CheckCastPPNode: public ConstraintCastNode {
170 public:
171 CheckCastPPNode(Node *c, Node *n, const Type *t, DependencyType dependency = RegularDependency)
172 : ConstraintCastNode(n, t, dependency) {
173 init_class_id(Class_CheckCastPP);
174 init_req(0, c);
175 }
176
177 virtual Node* Identity(PhaseGVN* phase);
178 virtual const Type* Value(PhaseGVN* phase) const;
179 virtual int Opcode() const;
180 virtual uint ideal_reg() const { return Op_RegP; }
181 bool depends_only_on_test() const { return !type()->isa_rawptr() && ConstraintCastNode::depends_only_on_test(); }
182 };
183
184
185 //------------------------------CastX2PNode-------------------------------------
186 // convert a machine-pointer-sized integer to a raw pointer
187 class CastX2PNode : public Node {
188 public:
189 CastX2PNode( Node *n ) : Node(NULL, n) {}
190 virtual int Opcode() const;
191 virtual const Type* Value(PhaseGVN* phase) const;
192 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
193 virtual Node* Identity(PhaseGVN* phase);
194 virtual uint ideal_reg() const { return Op_RegP; }
195 virtual const Type *bottom_type() const { return TypeRawPtr::BOTTOM; }
196 };
197
198 //------------------------------CastP2XNode-------------------------------------
199 // Used in both 32-bit and 64-bit land.
200 // Used for card-marks and unsafe pointer math.
201 class CastP2XNode : public Node {
202 public:
203 CastP2XNode( Node *ctrl, Node *n ) : Node(ctrl, n) {}
204 virtual int Opcode() const;
205 virtual const Type* Value(PhaseGVN* phase) const;
206 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
207 virtual Node* Identity(PhaseGVN* phase);
208 virtual uint ideal_reg() const { return Op_RegX; }
209 virtual const Type *bottom_type() const { return TypeX_X; }
210 // Return false to keep node from moving away from an associated card mark.
211 virtual bool depends_only_on_test() const { return false; }
212 };
213
214
215
216 #endif // SHARE_OPTO_CASTNODE_HPP