1 /*
2 * Copyright (c) 2014, 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_CASTNODE_HPP
26 #define SHARE_VM_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 ConstraintCastNode (Node *n, const Type *t ): TypeNode(t,2) {
37 init_class_id(Class_ConstraintCast);
38 init_req(1, n);
39 }
40 virtual Node *Identity( PhaseTransform *phase );
41 virtual const Type *Value( PhaseTransform *phase ) const;
42 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
43 virtual int Opcode() const;
44 virtual uint ideal_reg() const = 0;
45 };
46
47 //------------------------------CastIINode-------------------------------------
48 // cast integer to integer (different range)
49 class CastIINode: public ConstraintCastNode {
50 private:
51 // Can this node be removed post CCP or does it carry a required dependency?
52 const bool _carry_dependency;
53
54 protected:
55 virtual uint cmp( const Node &n ) const;
56 virtual uint size_of() const;
57
58 public:
59 CastIINode(Node *n, const Type *t, bool carry_dependency = false)
60 : ConstraintCastNode(n,t), _carry_dependency(carry_dependency) {}
61 virtual int Opcode() const;
62 virtual uint ideal_reg() const { return Op_RegI; }
63 virtual Node *Identity( PhaseTransform *phase );
64 virtual const Type *Value( PhaseTransform *phase ) const;
65 #ifndef PRODUCT
66 virtual void dump_spec(outputStream *st) const;
67 #endif
68 };
69
70 //------------------------------CastPPNode-------------------------------------
71 // cast pointer to pointer (different type)
72 class CastPPNode: public ConstraintCastNode {
73 public:
74 CastPPNode (Node *n, const Type *t ): ConstraintCastNode(n, t) {}
75 virtual int Opcode() const;
76 virtual uint ideal_reg() const { return Op_RegP; }
77 };
78
79 //------------------------------CheckCastPPNode--------------------------------
80 // for _checkcast, cast pointer to pointer (different type), without JOIN,
81 class CheckCastPPNode: public TypeNode {
82 public:
83 CheckCastPPNode( Node *c, Node *n, const Type *t ) : TypeNode(t,2) {
84 init_class_id(Class_CheckCastPP);
85 init_req(0, c);
86 init_req(1, n);
87 }
88
89 virtual Node *Identity( PhaseTransform *phase );
90 virtual const Type *Value( PhaseTransform *phase ) const;
91 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
92 virtual int Opcode() const;
93 virtual uint ideal_reg() const { return Op_RegP; }
94 };
95
96
97 //------------------------------CastX2PNode-------------------------------------
98 // convert a machine-pointer-sized integer to a raw pointer
99 class CastX2PNode : public Node {
100 public:
101 CastX2PNode( Node *n ) : Node(NULL, n) {}
102 virtual int Opcode() const;
103 virtual const Type *Value( PhaseTransform *phase ) const;
104 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
105 virtual Node *Identity( PhaseTransform *phase );
106 virtual uint ideal_reg() const { return Op_RegP; }
107 virtual const Type *bottom_type() const { return TypeRawPtr::BOTTOM; }
108 };
109
110 //------------------------------CastP2XNode-------------------------------------
111 // Used in both 32-bit and 64-bit land.
112 // Used for card-marks and unsafe pointer math.
113 class CastP2XNode : public Node {
114 public:
115 CastP2XNode( Node *ctrl, Node *n ) : Node(ctrl, n) {}
116 virtual int Opcode() const;
117 virtual const Type *Value( PhaseTransform *phase ) const;
118 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
119 virtual Node *Identity( PhaseTransform *phase );
120 virtual uint ideal_reg() const { return Op_RegX; }
121 virtual const Type *bottom_type() const { return TypeX_X; }
122 // Return false to keep node from moving away from an associated card mark.
123 virtual bool depends_only_on_test() const { return false; }
124 };
125
126
127
128 #endif // SHARE_VM_OPTO_CASTNODE_HPP