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 const Type* widen_type(const PhaseGVN* phase, const Type* res, BasicType bt) const;
47
48 public:
49 ConstraintCastNode(Node *n, const Type *t, DependencyType dependency)
50 : TypeNode(t,2), _dependency(dependency) {
51 init_class_id(Class_ConstraintCast);
52 init_req(1, n);
53 }
54 virtual Node* Identity(PhaseGVN* phase);
55 virtual const Type* Value(PhaseGVN* phase) const;
56 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
57 virtual int Opcode() const;
58 virtual uint ideal_reg() const = 0;
59 virtual bool depends_only_on_test() const { return _dependency == RegularDependency; }
60 bool carry_dependency() const { return _dependency != RegularDependency; }
61 TypeNode* dominating_cast(PhaseGVN* gvn, PhaseTransform* pt) const;
62 static Node* make_cast(int opcode, Node* c, Node *n, const Type *t, DependencyType dependency);
63 static Node* make(Node* c, Node *n, const Type *t, DependencyType dependency, BasicType bt);
64
65 #ifndef PRODUCT
66 virtual void dump_spec(outputStream *st) const;
67 #endif
68
69 static Node* make_cast_for_type(Node* c, Node* in, const Type* type, DependencyType dependency);
70
71 Node* optimize_integer_cast(PhaseGVN* phase, BasicType bt);
72 };
73
74 //------------------------------CastIINode-------------------------------------
75 // cast integer to integer (different range)
76 class CastIINode: public ConstraintCastNode {
77 protected:
78 // Is this node dependent on a range check?
79 const bool _range_check_dependency;
80 virtual bool cmp(const Node &n) const;
81 virtual uint size_of() const;
82
83 public:
84 CastIINode(Node* n, const Type* t, DependencyType dependency = RegularDependency, bool range_check_dependency = false)
85 : ConstraintCastNode(n, t, dependency), _range_check_dependency(range_check_dependency) {
86 init_class_id(Class_CastII);
87 }
88 CastIINode(Node* ctrl, Node* n, const Type* t, DependencyType dependency = RegularDependency, bool range_check_dependency = false)
89 : ConstraintCastNode(n, t, dependency), _range_check_dependency(range_check_dependency) {
90 init_class_id(Class_CastII);
91 init_req(0, ctrl);
92 }
93 virtual int Opcode() const;
94 virtual uint ideal_reg() const { return Op_RegI; }
95 virtual Node* Identity(PhaseGVN* phase);
96 virtual const Type* Value(PhaseGVN* phase) const;
97 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
98 const bool has_range_check() {
99 #ifdef _LP64
100 return _range_check_dependency;
101 #else
102 assert(!_range_check_dependency, "Should not have range check dependency");
103 return false;
104 #endif
105 }
106
107 #ifndef PRODUCT
108 virtual void dump_spec(outputStream* st) const;
109 #endif
110 };
111
112 class CastLLNode: public ConstraintCastNode {
113 public:
114 CastLLNode(Node* ctrl, Node* n, const Type* t, DependencyType dependency = RegularDependency)
115 : ConstraintCastNode(n, t, dependency) {
116 init_class_id(Class_CastLL);
117 init_req(0, ctrl);
118 }
119 CastLLNode(Node* n, const Type* t, DependencyType dependency = RegularDependency)
120 : ConstraintCastNode(n, t, dependency){
121 init_class_id(Class_CastLL);
122 }
123
124 virtual const Type* Value(PhaseGVN* phase) const;
125 virtual Node* Ideal(PhaseGVN* phase, bool can_reshape);
126 virtual int Opcode() const;
127 virtual uint ideal_reg() const { return Op_RegL; }
128 };
129
130 class CastFFNode: public ConstraintCastNode {
131 public:
132 CastFFNode(Node* n, const Type* t, DependencyType dependency = RegularDependency)
133 : ConstraintCastNode(n, t, dependency){
134 init_class_id(Class_CastFF);
135 }
136 virtual int Opcode() const;
137 virtual uint ideal_reg() const { return in(1)->ideal_reg(); }
138 };
139
140 class CastDDNode: public ConstraintCastNode {
141 public:
142 CastDDNode(Node* n, const Type* t, DependencyType dependency = RegularDependency)
143 : ConstraintCastNode(n, t, dependency){
144 init_class_id(Class_CastDD);
145 }
146 virtual int Opcode() const;
147 virtual uint ideal_reg() const { return in(1)->ideal_reg(); }
148 };
149
150 class CastVVNode: public ConstraintCastNode {
151 public:
152 CastVVNode(Node* n, const Type* t, DependencyType dependency = RegularDependency)
153 : ConstraintCastNode(n, t, dependency){
154 init_class_id(Class_CastVV);
155 }
156 virtual int Opcode() const;
157 virtual uint ideal_reg() const { return in(1)->ideal_reg(); }
158 };
159
160
161 //------------------------------CastPPNode-------------------------------------
162 // cast pointer to pointer (different type)
163 class CastPPNode: public ConstraintCastNode {
164 public:
165 CastPPNode (Node *n, const Type *t, DependencyType dependency = RegularDependency)
166 : ConstraintCastNode(n, t, dependency) {
167 }
168 virtual int Opcode() const;
169 virtual uint ideal_reg() const { return Op_RegP; }
170 };
171
172 //------------------------------CheckCastPPNode--------------------------------
173 // for _checkcast, cast pointer to pointer (different type), without JOIN,
174 class CheckCastPPNode: public ConstraintCastNode {
175 public:
176 CheckCastPPNode(Node *c, Node *n, const Type *t, DependencyType dependency = RegularDependency)
177 : ConstraintCastNode(n, t, dependency) {
178 init_class_id(Class_CheckCastPP);
179 init_req(0, c);
180 }
181
182 virtual const Type* Value(PhaseGVN* phase) const;
183 virtual int Opcode() const;
184 virtual uint ideal_reg() const { return Op_RegP; }
185 bool depends_only_on_test() const { return !type()->isa_rawptr() && ConstraintCastNode::depends_only_on_test(); }
186 };
187
188
189 //------------------------------CastX2PNode-------------------------------------
190 // convert a machine-pointer-sized integer to a raw pointer
191 class CastX2PNode : public Node {
192 public:
193 CastX2PNode( Node *n ) : Node(NULL, n) {}
194 virtual int Opcode() const;
195 virtual const Type* Value(PhaseGVN* phase) const;
196 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
197 virtual Node* Identity(PhaseGVN* phase);
198 virtual uint ideal_reg() const { return Op_RegP; }
199 virtual const Type *bottom_type() const { return TypeRawPtr::BOTTOM; }
200 };
201
202 //------------------------------CastP2XNode-------------------------------------
203 // Used in both 32-bit and 64-bit land.
204 // Used for card-marks and unsafe pointer math.
205 class CastP2XNode : public Node {
206 public:
207 CastP2XNode( Node *ctrl, Node *n ) : Node(ctrl, n) {}
208 virtual int Opcode() const;
209 virtual const Type* Value(PhaseGVN* phase) const;
210 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
211 virtual Node* Identity(PhaseGVN* phase);
212 virtual uint ideal_reg() const { return Op_RegX; }
213 virtual const Type *bottom_type() const { return TypeX_X; }
214 // Return false to keep node from moving away from an associated card mark.
215 virtual bool depends_only_on_test() const { return false; }
216 };
217
218
219
220 #endif // SHARE_OPTO_CASTNODE_HPP