Mercurial > hg > graal-compiler
view graal/com.oracle.graal.lir/src/com/oracle/graal/lir/alloc/trace/FixedRange.java @ 22591:c8faebfb7aed
TraceRA: clean-up and simplify.
author | Josef Eisl <josef.eisl@jku.at> |
---|---|
date | Mon, 07 Sep 2015 16:03:02 +0200 |
parents | graal/com.oracle.graal.lir/src/com/oracle/graal/lir/alloc/trace/Range.java@576594eb9fb0 |
children |
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/* * Copyright (c) 2015, 2015, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.graal.lir.alloc.trace; /** * Represents a range of integers from a start (inclusive) to an end (exclusive). */ public final class FixedRange { public static final FixedRange EndMarker = new FixedRange(Integer.MAX_VALUE, Integer.MAX_VALUE, null); /** * The start of the range, inclusive. */ public int from; /** * The end of the range, exclusive. */ public int to; /** * A link to allow the range to be put into a singly linked list. */ public FixedRange next; boolean intersects(TraceInterval i) { return intersectsAt(i) != -1; } /** * Creates a new range. * * @param from the start of the range, inclusive * @param to the end of the range, exclusive * @param next link to the next range in a linked list */ FixedRange(int from, int to, FixedRange next) { this.from = from; this.to = to; this.next = next; } int intersectsAt(TraceInterval other) { FixedRange range = this; assert other != null : "null ranges not allowed"; assert range != EndMarker && other != TraceInterval.EndMarker : "empty ranges not allowed"; int intervalFrom = other.from(); int intervalTo = other.to(); do { if (range.from < intervalFrom) { if (range.to <= intervalFrom) { range = range.next; if (range == EndMarker) { return -1; } } else { return intervalFrom; } } else { if (intervalFrom < range.from) { if (intervalTo <= range.from) { return -1; } return range.from; } else { assert range.from == intervalFrom; if (range.from == range.to) { range = range.next; if (range == EndMarker) { return -1; } } else { if (intervalFrom == intervalTo) { return -1; } return range.from; } } } } while (true); } @Override public String toString() { return "[" + from + ", " + to + "]"; } }