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 protected:
66 // Is this node dependent on a range check?
67 const bool _range_check_dependency;
68 virtual uint cmp(const Node &n) const;
69 virtual uint size_of() const;
70
71 public:
72 CastIINode(Node* n, const Type* t, bool carry_dependency = false, bool range_check_dependency = false)
73 : ConstraintCastNode(n, t, carry_dependency), _range_check_dependency(range_check_dependency) {
74 init_class_id(Class_CastII);
75 }
76 virtual int Opcode() const;
77 virtual uint ideal_reg() const { return Op_RegI; }
78 virtual const Type* Value(PhaseGVN* phase) const;
79 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
80 const bool has_range_check() { return _range_check_dependency; }
81 #ifndef PRODUCT
82 virtual void dump_spec(outputStream* st) const;
83 #endif
84 };
85
86 //------------------------------CastPPNode-------------------------------------
87 // cast pointer to pointer (different type)
88 class CastPPNode: public ConstraintCastNode {
89 public:
90 CastPPNode (Node *n, const Type *t, bool carry_dependency = false)
91 : ConstraintCastNode(n, t, carry_dependency) {
92 }
93 virtual int Opcode() const;
94 virtual uint ideal_reg() const { return Op_RegP; }
95 };
96
97 //------------------------------CheckCastPPNode--------------------------------
98 // for _checkcast, cast pointer to pointer (different type), without JOIN,
99 class CheckCastPPNode: public ConstraintCastNode {
100 public:
101 CheckCastPPNode(Node *c, Node *n, const Type *t, bool carry_dependency = false)
102 : ConstraintCastNode(n, t, carry_dependency) {
103 init_class_id(Class_CheckCastPP);
104 init_req(0, c);
105 }
106
107 virtual Node* Identity(PhaseGVN* phase);
108 virtual const Type* Value(PhaseGVN* phase) const;
109 virtual int Opcode() const;
110 virtual uint ideal_reg() const { return Op_RegP; }
111 };
112
113
114 //------------------------------CastX2PNode-------------------------------------
115 // convert a machine-pointer-sized integer to a raw pointer
116 class CastX2PNode : public Node {
117 public:
118 CastX2PNode( Node *n ) : Node(NULL, n) {}
119 virtual int Opcode() const;
120 virtual const Type* Value(PhaseGVN* phase) const;
121 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
122 virtual Node* Identity(PhaseGVN* phase);
123 virtual uint ideal_reg() const { return Op_RegP; }
124 virtual const Type *bottom_type() const { return TypeRawPtr::BOTTOM; }
125 };
126
127 //------------------------------CastP2XNode-------------------------------------
128 // Used in both 32-bit and 64-bit land.
129 // Used for card-marks and unsafe pointer math.
130 class CastP2XNode : public Node {
131 public:
132 CastP2XNode( Node *ctrl, Node *n ) : Node(ctrl, n) {}
133 virtual int Opcode() const;
134 virtual const Type* Value(PhaseGVN* phase) const;
135 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
136 virtual Node* Identity(PhaseGVN* phase);
137 virtual uint ideal_reg() const { return Op_RegX; }
138 virtual const Type *bottom_type() const { return TypeX_X; }
139 // Return false to keep node from moving away from an associated card mark.
140 virtual bool depends_only_on_test() const { return false; }
141 };
142
143
144
145 #endif // SHARE_VM_OPTO_CASTNODE_HPP