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comparison graal/GraalCompiler/src/com/sun/c1x/alloc/Range.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/alloc/Range.java@9ec15d6914ca
children
comparison
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2508:fea94949e0a2 2509:16b9a8b5ad39
1 /*
2 * Copyright (c) 2009, 2010, 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.alloc;
24
25
26 /**
27 * Represents a range of integers from a start (inclusive) to an end (exclusive.
28 *
29 * @author Thomas Wuerthinger
30 */
31 public final class Range {
32
33 public static final Range EndMarker = new Range(Integer.MAX_VALUE, Integer.MAX_VALUE, null);
34
35 /**
36 * The start of the range, inclusive.
37 */
38 public int from;
39
40 /**
41 * The end of the range, exclusive.
42 */
43 public int to;
44
45 /**
46 * A link to allow the range to be put into a singly linked list.
47 */
48 public Range next;
49
50 boolean intersects(Range r) {
51 return intersectsAt(r) != -1;
52 }
53
54
55 /**
56 * Creates a new range.
57 *
58 * @param from the start of the range, inclusive
59 * @param to the end of the range, exclusive
60 * @param next link to the next range in a linked list
61 */
62 Range(int from, int to, Range next) {
63 this.from = from;
64 this.to = to;
65 this.next = next;
66 }
67
68 int intersectsAt(Range r2) {
69 Range r1 = this;
70
71 assert r2 != null : "null ranges not allowed";
72 assert r1 != EndMarker && r2 != EndMarker : "empty ranges not allowed";
73
74 do {
75 if (r1.from < r2.from) {
76 if (r1.to <= r2.from) {
77 r1 = r1.next;
78 if (r1 == EndMarker) {
79 return -1;
80 }
81 } else {
82 return r2.from;
83 }
84 } else {
85 if (r2.from < r1.from) {
86 if (r2.to <= r1.from) {
87 r2 = r2.next;
88 if (r2 == EndMarker) {
89 return -1;
90 }
91 } else {
92 return r1.from;
93 }
94 } else { // r1.from() == r2.from()
95 if (r1.from == r1.to) {
96 r1 = r1.next;
97 if (r1 == EndMarker) {
98 return -1;
99 }
100 } else {
101 if (r2.from == r2.to) {
102 r2 = r2.next;
103 if (r2 == EndMarker) {
104 return -1;
105 }
106 } else {
107 return r1.from;
108 }
109 }
110 }
111 }
112 } while (true);
113 }
114
115 @Override
116 public String toString() {
117 return "[" + from + ", " + to + "]";
118 }
119 }