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package org.graalvm.compiler.lir.alloc.lsra;

Represents a range of integers from a start (inclusive) to an end (exclusive.
/** * Represents a range of integers from a start (inclusive) to an end (exclusive. */
public final class Range {
The start of the range, inclusive.
/** * The start of the range, inclusive. */
public int from;
The end of the range, exclusive.
/** * The end of the range, exclusive. */
public int to;
A link to allow the range to be put into a singly linked list.
/** * A link to allow the range to be put into a singly linked list. */
public Range next; boolean intersects(Range r) { return intersectsAt(r) != -1; }
Creates a new range.
Params:
  • from – the start of the range, inclusive
  • to – the end of the range, exclusive
  • next – link to the next range in a linked list
/** * 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 */
Range(int from, int to, Range next) { this.from = from; this.to = to; this.next = next; } public boolean isEndMarker() { assert from != Integer.MAX_VALUE || (to == Integer.MAX_VALUE && next == null); return from == Integer.MAX_VALUE; } int intersectsAt(Range other) { Range r1 = this; Range r2 = other; assert r2 != null : "null ranges not allowed"; assert !r1.isEndMarker() && !r2.isEndMarker() : "empty ranges not allowed"; do { if (r1.from < r2.from) { if (r1.to <= r2.from) { r1 = r1.next; if (r1.isEndMarker()) { return -1; } } else { return r2.from; } } else { if (r2.from < r1.from) { if (r2.to <= r1.from) { r2 = r2.next; if (r2.isEndMarker()) { return -1; } } else { return r1.from; } } else { // r1.from() == r2.from() if (r1.from == r1.to) { r1 = r1.next; if (r1.isEndMarker()) { return -1; } } else { if (r2.from == r2.to) { r2 = r2.next; if (r2.isEndMarker()) { return -1; } } else { return r1.from; } } } } } while (true); } @Override public String toString() { return "[" + from + ", " + to + "]"; } }