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 virtual Node *Ideal_DU_postCCP( PhaseCCP * );
46 };
47
48 //------------------------------CastIINode-------------------------------------
49 // cast integer to integer (different range)
50 class CastIINode: public ConstraintCastNode {
51 public:
52 CastIINode (Node *n, const Type *t ): ConstraintCastNode(n,t) {}
53 virtual int Opcode() const;
54 virtual uint ideal_reg() const { return Op_RegI; }
55 };
56
57 //------------------------------CastPPNode-------------------------------------
58 // cast pointer to pointer (different type)
59 class CastPPNode: public ConstraintCastNode {
60 public:
61 CastPPNode (Node *n, const Type *t ): ConstraintCastNode(n, t) {}
62 virtual int Opcode() const;
63 virtual uint ideal_reg() const { return Op_RegP; }
64 virtual Node *Ideal_DU_postCCP( PhaseCCP * );
65 };
66
67 //------------------------------CheckCastPPNode--------------------------------
68 // for _checkcast, cast pointer to pointer (different type), without JOIN,
69 class CheckCastPPNode: public TypeNode {
70 public:
71 CheckCastPPNode( Node *c, Node *n, const Type *t ) : TypeNode(t,2) {
72 init_class_id(Class_CheckCastPP);
73 init_req(0, c);
74 init_req(1, n);
75 }
76
77 virtual Node *Identity( PhaseTransform *phase );
78 virtual const Type *Value( PhaseTransform *phase ) const;
79 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
80 virtual int Opcode() const;
81 virtual uint ideal_reg() const { return Op_RegP; }
82 // No longer remove CheckCast after CCP as it gives me a place to hang
83 // the proper address type - which is required to compute anti-deps.
84 //virtual Node *Ideal_DU_postCCP( PhaseCCP * );
85 };
86
87
88 //------------------------------CastX2PNode-------------------------------------
89 // convert a machine-pointer-sized integer to a raw pointer
90 class CastX2PNode : public Node {
91 public:
92 CastX2PNode( Node *n ) : Node(NULL, n) {}
93 virtual int Opcode() const;
94 virtual const Type *Value( PhaseTransform *phase ) const;
95 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
96 virtual Node *Identity( PhaseTransform *phase );
97 virtual uint ideal_reg() const { return Op_RegP; }
98 virtual const Type *bottom_type() const { return TypeRawPtr::BOTTOM; }
99 };
100
101 //------------------------------CastP2XNode-------------------------------------
102 // Used in both 32-bit and 64-bit land.
103 // Used for card-marks and unsafe pointer math.
104 class CastP2XNode : public Node {
105 public:
106 CastP2XNode( Node *ctrl, Node *n ) : Node(ctrl, n) {}
107 virtual int Opcode() const;
108 virtual const Type *Value( PhaseTransform *phase ) const;
109 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
110 virtual Node *Identity( PhaseTransform *phase );
111 virtual uint ideal_reg() const { return Op_RegX; }
112 virtual const Type *bottom_type() const { return TypeX_X; }
113 // Return false to keep node from moving away from an associated card mark.
114 virtual bool depends_only_on_test() const { return false; }
115 };
116
117
118
119 #endif // SHARE_VM_OPTO_CASTNODE_HPP