| /* |
| * Copyright (c) 2016, 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 jdk.vm.ci.code; |
| |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| /** |
| * An immutable ordered list of registers. Only required because Java lacks immutable arrays. |
| */ |
| public final class RegisterArray implements Iterable<Register> { |
| |
| private final Register[] registers; |
| private int hash; |
| |
| public RegisterArray(Register... registers) { |
| this.registers = registers; |
| } |
| |
| public RegisterArray(Collection<Register> registers) { |
| this.registers = registers.toArray(new Register[registers.size()]); |
| } |
| |
| /** |
| * Gets the number of registers. |
| */ |
| public int size() { |
| return registers.length; |
| } |
| |
| /** |
| * Gets the register at a given index. |
| * |
| * @param index the index of the register to retrieve |
| */ |
| public Register get(int index) { |
| return registers[index]; |
| } |
| |
| public void addTo(Collection<Register> collection) { |
| collection.addAll(Arrays.asList(registers)); |
| } |
| |
| /** |
| * Gets an immutable view of the registers as a list. |
| */ |
| public List<Register> asList() { |
| return Collections.unmodifiableList(Arrays.asList(registers)); |
| } |
| |
| /** |
| * Gets a copy of the registers as an array. |
| */ |
| public Register[] toArray() { |
| return registers.clone(); |
| } |
| |
| public Iterator<Register> iterator() { |
| return Arrays.asList(registers).iterator(); |
| } |
| |
| @Override |
| public int hashCode() { |
| if (hash == 0 && registers.length > 0) { |
| hash = Arrays.hashCode(registers); |
| } |
| return hash; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj instanceof RegisterArray) { |
| return Arrays.equals(registers, ((RegisterArray) obj).registers); |
| } |
| return false; |
| } |
| |
| @Override |
| public String toString() { |
| return Arrays.toString(registers); |
| } |
| } |