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#include "precompiled.hpp"
26#include "opto/narrowptrnode.hpp"
27#include "opto/phaseX.hpp"
28
29Node* DecodeNNode::Identity(PhaseGVN* phase) {
30 const Type *t = phase->type( in(1) );
31 if( t == Type::TOP ) return in(1);
32
33 if (in(1)->is_EncodeP()) {
34 // (DecodeN (EncodeP p)) -> p
35 return in(1)->in(1);
36 }
37 return this;
38}
39
40const Type* DecodeNNode::Value(PhaseGVN* phase) const {
41 const Type *t = phase->type( in(1) );
42 if (t == Type::TOP) return Type::TOP;
43 if (t == TypeNarrowOop::NULL_PTR) return TypePtr::NULL_PTR;
44
45 assert(t->isa_narrowoop(), "only narrowoop here");
46 return t->make_ptr();
47}
48
49Node* EncodePNode::Identity(PhaseGVN* phase) {
50 const Type *t = phase->type( in(1) );
51 if( t == Type::TOP ) return in(1);
52
53 if (in(1)->is_DecodeN()) {
54 // (EncodeP (DecodeN p)) -> p
55 return in(1)->in(1);
56 }
57 return this;
58}
59
60const Type* EncodePNode::Value(PhaseGVN* phase) const {
61 const Type *t = phase->type( in(1) );
62 if (t == Type::TOP) return Type::TOP;
63 if (t == TypePtr::NULL_PTR) return TypeNarrowOop::NULL_PTR;
64
65 assert(t->isa_oop_ptr(), "only oopptr here");
66 return t->make_narrowoop();
67}
68
69
70Node* DecodeNKlassNode::Identity(PhaseGVN* phase) {
71 const Type *t = phase->type( in(1) );
72 if( t == Type::TOP ) return in(1);
73
74 if (in(1)->is_EncodePKlass()) {
75 // (DecodeNKlass (EncodePKlass p)) -> p
76 return in(1)->in(1);
77 }
78 return this;
79}
80
81const Type* DecodeNKlassNode::Value(PhaseGVN* phase) const {
82 const Type *t = phase->type( in(1) );
83 if (t == Type::TOP) return Type::TOP;
84 assert(t != TypeNarrowKlass::NULL_PTR, "null klass?");
85
86 assert(t->isa_narrowklass(), "only narrow klass ptr here");
87 return t->make_ptr();
88}
89
90Node* EncodePKlassNode::Identity(PhaseGVN* phase) {
91 const Type *t = phase->type( in(1) );
92 if( t == Type::TOP ) return in(1);
93
94 if (in(1)->is_DecodeNKlass()) {
95 // (EncodePKlass (DecodeNKlass p)) -> p
96 return in(1)->in(1);
97 }
98 return this;
99}
100
101const Type* EncodePKlassNode::Value(PhaseGVN* phase) const {
102 const Type *t = phase->type( in(1) );
103 if (t == Type::TOP) return Type::TOP;
104 assert (t != TypePtr::NULL_PTR, "null klass?");
105
106 assert(UseCompressedClassPointers && t->isa_klassptr(), "only klass ptr here");
107 return t->make_narrowklass();
108}
109
110