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 protected:
36 // Can this node be removed post CCP or does it carry a required dependency?
37 const bool _carry_dependency;
38 virtual uint cmp( const Node &n ) const;
39 virtual uint size_of() const;
40
41 public:
42 ConstraintCastNode(Node *n, const Type *t, bool carry_dependency)
43 : TypeNode(t,2), _carry_dependency(carry_dependency) {
44 init_class_id(Class_ConstraintCast);
45 init_req(1, n);
46 }
47 virtual Node* Identity(PhaseGVN* phase);
48 virtual const Type* Value(PhaseGVN* phase) const;
49 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
50 virtual int Opcode() const;
51 virtual uint ideal_reg() const = 0;
52 virtual bool depends_only_on_test() const { return !_carry_dependency; }
53 bool carry_dependency() const { return _carry_dependency; }
54 TypeNode* dominating_cast(PhaseTransform *phase) const;
55 static Node* make_cast(int opcode, Node* c, Node *n, const Type *t, bool carry_dependency);
56
57 #ifndef PRODUCT
58 virtual void dump_spec(outputStream *st) const;
59 #endif
60 };
61
62 //------------------------------CastIINode-------------------------------------
63 // cast integer to integer (different range)
64 class CastIINode: public ConstraintCastNode {
65 public:
66 CastIINode(Node *n, const Type *t, bool carry_dependency = false)
67 : ConstraintCastNode(n, t, carry_dependency) {}
68 virtual int Opcode() const;
69 virtual uint ideal_reg() const { return Op_RegI; }
70 virtual const Type* Value(PhaseGVN* phase) const;
71 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
72 };
73
74 //------------------------------CastPPNode-------------------------------------
75 // cast pointer to pointer (different type)
76 class CastPPNode: public ConstraintCastNode {
77 public:
78 CastPPNode (Node *n, const Type *t, bool carry_dependency = false)
79 : ConstraintCastNode(n, t, carry_dependency) {
80 }
81 virtual int Opcode() const;
82 virtual uint ideal_reg() const { return Op_RegP; }
83 };
84
85 //------------------------------CheckCastPPNode--------------------------------
86 // for _checkcast, cast pointer to pointer (different type), without JOIN,
87 class CheckCastPPNode: public ConstraintCastNode {
88 public:
89 CheckCastPPNode(Node *c, Node *n, const Type *t, bool carry_dependency = false)
90 : ConstraintCastNode(n, t, carry_dependency) {
91 init_class_id(Class_CheckCastPP);
92 init_req(0, c);
93 }
94
95 virtual Node* Identity(PhaseGVN* phase);
96 virtual const Type* Value(PhaseGVN* phase) const;
97 virtual int Opcode() const;
98 virtual uint ideal_reg() const { return Op_RegP; }
99 };
100
101
102 //------------------------------CastX2PNode-------------------------------------
103 // convert a machine-pointer-sized integer to a raw pointer
104 class CastX2PNode : public Node {
105 public:
106 CastX2PNode( Node *n ) : Node(NULL, n) {}
107 virtual int Opcode() const;
108 virtual const Type* Value(PhaseGVN* phase) const;
109 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
110 virtual Node* Identity(PhaseGVN* phase);
111 virtual uint ideal_reg() const { return Op_RegP; }
112 virtual const Type *bottom_type() const { return TypeRawPtr::BOTTOM; }
113 };
114
115 //------------------------------CastP2XNode-------------------------------------
116 // Used in both 32-bit and 64-bit land.
117 // Used for card-marks and unsafe pointer math.
118 class CastP2XNode : public Node {
119 public:
120 CastP2XNode( Node *ctrl, Node *n ) : Node(ctrl, n) {}
121 virtual int Opcode() const;
122 virtual const Type* Value(PhaseGVN* phase) const;
123 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
124 virtual Node* Identity(PhaseGVN* phase);
125 virtual uint ideal_reg() const { return Op_RegX; }
126 virtual const Type *bottom_type() const { return TypeX_X; }
127 // Return false to keep node from moving away from an associated card mark.
128 virtual bool depends_only_on_test() const { return false; }
129 };
130
131
132
133 #endif // SHARE_VM_OPTO_CASTNODE_HPP