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_NARROWNODE_HPP
26 #define SHARE_VM_OPTO_NARROWNODE_HPP
27
28 #include "opto/node.hpp"
29 #include "opto/opcodes.hpp"
30
31 //------------------------------EncodeNarrowPtr--------------------------------
32 class EncodeNarrowPtrNode : public TypeNode {
33 protected:
34 EncodeNarrowPtrNode(Node* value, const Type* type):
35 TypeNode(type, 2) {
36 init_class_id(Class_EncodeNarrowPtr);
37 init_req(0, NULL);
38 init_req(1, value);
39 }
40 public:
41 virtual uint ideal_reg() const { return Op_RegN; }
42 virtual Node *Ideal_DU_postCCP( PhaseCCP *ccp );
43 };
44
45 //------------------------------EncodeP--------------------------------
46 // Encodes an oop pointers into its compressed form
47 // Takes an extra argument which is the real heap base as a long which
48 // may be useful for code generation in the backend.
49 class EncodePNode : public EncodeNarrowPtrNode {
50 public:
51 EncodePNode(Node* value, const Type* type):
52 EncodeNarrowPtrNode(value, type) {
53 init_class_id(Class_EncodeP);
54 }
55 virtual int Opcode() const;
56 virtual Node *Identity( PhaseTransform *phase );
57 virtual const Type *Value( PhaseTransform *phase ) const;
58 };
59
60 //------------------------------EncodePKlass--------------------------------
61 // Encodes a klass pointer into its compressed form
62 // Takes an extra argument which is the real heap base as a long which
63 // may be useful for code generation in the backend.
64 class EncodePKlassNode : public EncodeNarrowPtrNode {
65 public:
66 EncodePKlassNode(Node* value, const Type* type):
67 EncodeNarrowPtrNode(value, type) {
68 init_class_id(Class_EncodePKlass);
69 }
70 virtual int Opcode() const;
71 virtual Node *Identity( PhaseTransform *phase );
72 virtual const Type *Value( PhaseTransform *phase ) const;
73 };
74
75 //------------------------------DecodeNarrowPtr--------------------------------
76 class DecodeNarrowPtrNode : public TypeNode {
77 protected:
78 DecodeNarrowPtrNode(Node* value, const Type* type):
79 TypeNode(type, 2) {
80 init_class_id(Class_DecodeNarrowPtr);
81 init_req(0, NULL);
82 init_req(1, value);
83 }
84 public:
85 virtual uint ideal_reg() const { return Op_RegP; }
86 };
87
88 //------------------------------DecodeN--------------------------------
89 // Converts a narrow oop into a real oop ptr.
90 // Takes an extra argument which is the real heap base as a long which
91 // may be useful for code generation in the backend.
92 class DecodeNNode : public DecodeNarrowPtrNode {
93 public:
94 DecodeNNode(Node* value, const Type* type):
95 DecodeNarrowPtrNode(value, type) {
96 init_class_id(Class_DecodeN);
97 }
98 virtual int Opcode() const;
99 virtual const Type *Value( PhaseTransform *phase ) const;
100 virtual Node *Identity( PhaseTransform *phase );
101 };
102
103 //------------------------------DecodeNKlass--------------------------------
104 // Converts a narrow klass pointer into a real klass ptr.
105 // Takes an extra argument which is the real heap base as a long which
106 // may be useful for code generation in the backend.
107 class DecodeNKlassNode : public DecodeNarrowPtrNode {
108 public:
109 DecodeNKlassNode(Node* value, const Type* type):
110 DecodeNarrowPtrNode(value, type) {
111 init_class_id(Class_DecodeNKlass);
112 }
113 virtual int Opcode() const;
114 virtual const Type *Value( PhaseTransform *phase ) const;
115 virtual Node *Identity( PhaseTransform *phase );
116 };
117
118 #endif // SHARE_VM_OPTO_NARROWNODE_HPP
119