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comparison graal/Compiler/src/com/sun/c1x/ir/TypeCheck.java @ 2507:9ec15d6914ca

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Pull over of compiler from maxine repository.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:43:22 +0200
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1 /*
2 * Copyright (c) 2009, 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.value.*;
26 import com.sun.cri.ci.*;
27 import com.sun.cri.ri.*;
28
29 /**
30 * The {@code TypeCheck} instruction is the base class of casts and instanceof tests.
31 *
32 * @author Ben L. Titzer
33 */
34 public abstract class TypeCheck extends StateSplit {
35
36 final RiType targetClass;
37 public Value targetClassInstruction;
38 Value object;
39
40 /**
41 * Creates a new TypeCheck instruction.
42 * @param targetClass the class which is being casted to or checked against
43 * @param object the instruction which produces the object
44 * @param kind the result type of this instruction
45 * @param stateBefore the state before this instruction is executed
46 */
47 public TypeCheck(RiType targetClass, Value targetClassInstruction, Value object, CiKind kind, FrameState stateBefore) {
48 super(kind, stateBefore);
49 this.targetClass = targetClass;
50 this.targetClassInstruction = targetClassInstruction;
51 this.object = object;
52 }
53
54 /**
55 * Gets the instruction that loads the target class object that is used by this checkcast.
56 * @return the target class instruction
57 */
58 public Value targetClassInstruction() {
59 return targetClassInstruction;
60 }
61
62 /**
63 * Gets the target class, i.e. the class being cast to, or the class being tested against.
64 * @return the target class
65 */
66 public RiType targetClass() {
67 return targetClass;
68 }
69
70 /**
71 * Gets the instruction which produces the object input.
72 * @return the instruction producing the object
73 */
74 public Value object() {
75 return object;
76 }
77
78 /**
79 * Checks whether the target class of this instruction is loaded.
80 * @return {@code true} if the target class is loaded
81 */
82 public boolean isLoaded() {
83 return targetClass != null;
84 }
85
86 /**
87 * Checks whether this instruction can trap.
88 * @return {@code true}, conservatively assuming the cast may fail
89 */
90 @Override
91 public boolean canTrap() {
92 return true;
93 }
94
95 /**
96 * Iterates over the input values to this instruction.
97 * @param closure the closure to apply
98 */
99 @Override
100 public void inputValuesDo(ValueClosure closure) {
101 object = closure.apply(object);
102 targetClassInstruction = closure.apply(targetClassInstruction);
103 }
104
105 /**
106 * Sets this type check operation to be a direct compare.
107 */
108 public void setDirectCompare() {
109 setFlag(Flag.DirectCompare);
110 }
111
112 /**
113 * Checks where this comparison is a direct compare, because the class compared to is a leaf class.
114 * @return {@code true} if this typecheck is a direct compare
115 */
116 public boolean isDirectCompare() {
117 return checkFlag(Flag.DirectCompare);
118 }
119 }