Mercurial > hg > graal-jvmci-8
comparison graal/Compiler/src/com/sun/c1x/ir/ArrayLength.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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2506:4a3bf8a5bf41 | 2507:9ec15d6914ca |
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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.debug.*; | |
26 import com.sun.c1x.util.*; | |
27 import com.sun.c1x.value.*; | |
28 import com.sun.cri.bytecode.*; | |
29 import com.sun.cri.ci.*; | |
30 | |
31 /** | |
32 * The {@code ArrayLength} instruction gets the length of an array. | |
33 * | |
34 * @author Ben L. Titzer | |
35 */ | |
36 public final class ArrayLength extends AccessArray { | |
37 | |
38 /** | |
39 * Constructs a new ArrayLength instruction. | |
40 * @param array the instruction producing the array | |
41 * @param newFrameState the state before executing this instruction | |
42 */ | |
43 public ArrayLength(Value array, FrameState newFrameState) { | |
44 super(CiKind.Int, array, newFrameState); | |
45 if (array.isNonNull()) { | |
46 eliminateNullCheck(); | |
47 } | |
48 } | |
49 | |
50 /** | |
51 * Clears the state associated with a null check. | |
52 */ | |
53 @Override | |
54 public void runtimeCheckCleared() { | |
55 if (!needsNullCheck()) { | |
56 clearState(); | |
57 } | |
58 } | |
59 | |
60 /** | |
61 * Checks whether this instruction can cause a trap. | |
62 * @return {@code true} if this instruction can cause a trap | |
63 */ | |
64 @Override | |
65 public boolean canTrap() { | |
66 return needsNullCheck(); | |
67 } | |
68 | |
69 @Override | |
70 public void accept(ValueVisitor v) { | |
71 v.visitArrayLength(this); | |
72 } | |
73 | |
74 @Override | |
75 public int valueNumber() { | |
76 return Util.hash1(Bytecodes.ARRAYLENGTH, array); | |
77 } | |
78 | |
79 @Override | |
80 public boolean valueEqual(Instruction i) { | |
81 if (i instanceof ArrayLength) { | |
82 ArrayLength o = (ArrayLength) i; | |
83 return array == o.array; | |
84 } | |
85 return false; | |
86 } | |
87 | |
88 @Override | |
89 public void print(LogStream out) { | |
90 out.print(array).print(".length"); | |
91 } | |
92 } |