Mercurial > hg > graal-jvmci-8

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

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2507
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
1 /*
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
2 * Copyright (c) 2010, 2011, Oracle and/or its affiliates. All rights reserved.
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
4 *
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
5 * This code is free software; you can redistribute it and/or modify it
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
6 * under the terms of the GNU General Public License version 2 only, as
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
7 * published by the Free Software Foundation.
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
8 *
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
9 * This code is distributed in the hope that it will be useful, but WITHOUT
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
12 * version 2 for more details (a copy is included in the LICENSE file that
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
13 * accompanied this code).
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
14 *
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
15 * You should have received a copy of the GNU General Public License version
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
16 * 2 along with this work; if not, write to the Free Software Foundation,
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
18 *
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
20 * or visit www.oracle.com if you need additional information or have any
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
21 * questions.
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
22 */
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
23 package com.sun.c1x.ir;
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
24
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
25 import com.sun.c1x.debug.*;
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
26 import com.sun.cri.bytecode.*;
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
27 import com.sun.cri.ci.*;
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
28 import com.sun.cri.ri.*;
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
29
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
30 /**
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
31 * The {@code UnsafeCast} instruction represents a {@link Bytecodes#UNSAFE_CAST}.
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
32 *
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
33 * @author Doug Simon
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
34 */
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
35 public final class UnsafeCast extends Instruction {
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
36
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
37 public final RiType toType;
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
38
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
39 /**
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
40 * The instruction that produced the value being unsafe cast.
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
41 */
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
42 private Value value;
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
43
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
44 /**
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
45 * Denotes if this is a redundant cast at the machine level. That is the source
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
46 * and the destination kind are implemented by the same machine kind.
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
47 */
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
48 public final boolean redundant;
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
49
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
50 /**
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
51 * Creates a new UnsafeCast instruction.
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
52 *
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
53 * @param toType the the being cast to
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
54 * @param value the value being cast
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
55 */
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
56 public UnsafeCast(RiType toType, Value value, boolean redundant) {
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
57 super(toType.kind().stackKind());
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
58 this.toType = toType;
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
59 this.value = value;
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
60 this.redundant = redundant;
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
61 }
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
62
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
63 /**
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
64 * Gets the first non-redundant value derived from this value. If this
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
65 * value is not {@linkplain #redundant}, then it is returned. Otherwise,
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
66 * the first value found by following {@link #value()} that is not an
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
67 * unsafe cast or is not redundant is returned.
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
68 */
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
69 public Value nonRedundantReplacement() {
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
70 if (!redundant) {
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
71 return this;
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
72 }
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
73 if (!(value instanceof UnsafeCast)) {
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
74 return value;
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
75 }
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
76 return ((UnsafeCast) value).nonRedundantReplacement();
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
77 }
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
78
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
79 /**
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
80 * Gets the instruction that produced the value being unsafe cast.
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
81 */
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
82 public Value value() {
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
83 return value;
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
84 }
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
85
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
86 @Override
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
87 public RiType declaredType() {
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
88 return toType;
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
89 }
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
90
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
91 @Override
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
92 public RiType exactType() {
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
93 return declaredType().exactType();
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
94 }
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
95
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
96 @Override
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
97 public void accept(ValueVisitor v) {
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
98 v.visitUnsafeCast(this);
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
99 }
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
100
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
101 /**
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
102 * Iterates over the input values to this instruction.
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
103 * @param closure the closure to apply
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
104 */
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
105 @Override
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
106 public void inputValuesDo(ValueClosure closure) {
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
107 value = closure.apply(value);
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
108 }
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
109
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
110 @Override
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
111 public void print(LogStream out) {
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
112 out.print("unsafe_cast(").
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
113 print(value).
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
114 print(") ").
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
115 print(CiUtil.toJavaName(toType));
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
116 }
9ec15d6914ca Pull over of compiler from maxine repository.
Thomas Wuerthinger <thomas@wuerthinger.net>
parents:
diff changeset
117 }