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comparison graal/Compiler/src/com/sun/c1x/ir/ArrayLength.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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2506:4a3bf8a5bf41 2507:9ec15d6914ca
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 }