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comparison graal/GraalCompiler/src/com/sun/c1x/ir/UnsafeCast.java @ 2509:16b9a8b5ad39

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Renamings Runtime=>GraalRuntime and Compiler=>GraalCompiler
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:50:44 +0200
parents graal/Compiler/src/com/sun/c1x/ir/UnsafeCast.java@9ec15d6914ca
children
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2508:fea94949e0a2 2509:16b9a8b5ad39
1 /*
2 * Copyright (c) 2010, 2011, 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 package com.sun.c1x.ir;
24
25 import com.sun.c1x.debug.*;
26 import com.sun.cri.bytecode.*;
27 import com.sun.cri.ci.*;
28 import com.sun.cri.ri.*;
29
30 /**
31 * The {@code UnsafeCast} instruction represents a {@link Bytecodes#UNSAFE_CAST}.
32 *
33 * @author Doug Simon
34 */
35 public final class UnsafeCast extends Instruction {
36
37 public final RiType toType;
38
39 /**
40 * The instruction that produced the value being unsafe cast.
41 */
42 private Value value;
43
44 /**
45 * Denotes if this is a redundant cast at the machine level. That is the source
46 * and the destination kind are implemented by the same machine kind.
47 */
48 public final boolean redundant;
49
50 /**
51 * Creates a new UnsafeCast instruction.
52 *
53 * @param toType the the being cast to
54 * @param value the value being cast
55 */
56 public UnsafeCast(RiType toType, Value value, boolean redundant) {
57 super(toType.kind().stackKind());
58 this.toType = toType;
59 this.value = value;
60 this.redundant = redundant;
61 }
62
63 /**
64 * Gets the first non-redundant value derived from this value. If this
65 * value is not {@linkplain #redundant}, then it is returned. Otherwise,
66 * the first value found by following {@link #value()} that is not an
67 * unsafe cast or is not redundant is returned.
68 */
69 public Value nonRedundantReplacement() {
70 if (!redundant) {
71 return this;
72 }
73 if (!(value instanceof UnsafeCast)) {
74 return value;
75 }
76 return ((UnsafeCast) value).nonRedundantReplacement();
77 }
78
79 /**
80 * Gets the instruction that produced the value being unsafe cast.
81 */
82 public Value value() {
83 return value;
84 }
85
86 @Override
87 public RiType declaredType() {
88 return toType;
89 }
90
91 @Override
92 public RiType exactType() {
93 return declaredType().exactType();
94 }
95
96 @Override
97 public void accept(ValueVisitor v) {
98 v.visitUnsafeCast(this);
99 }
100
101 /**
102 * Iterates over the input values to this instruction.
103 * @param closure the closure to apply
104 */
105 @Override
106 public void inputValuesDo(ValueClosure closure) {
107 value = closure.apply(value);
108 }
109
110 @Override
111 public void print(LogStream out) {
112 out.print("unsafe_cast(").
113 print(value).
114 print(") ").
115 print(CiUtil.toJavaName(toType));
116 }
117 }