| /* |
| * This file is part of the Jikes RVM project (http://jikesrvm.org). |
| * |
| * This file is licensed to You under the Common Public License (CPL); |
| * You may not use this file except in compliance with the License. You |
| * may obtain a copy of the License at |
| * |
| * http://www.opensource.org/licenses/cpl1.0.php |
| * |
| * See the COPYRIGHT.txt file distributed with this work for information |
| * regarding copyright ownership. |
| */ |
| package org.vmutil.options; |
| |
| import org.vmmagic.pragma.Uninterruptible; |
| import org.vmmagic.unboxed.Extent; |
| |
| /** |
| * A memory option that stores values as a whole number of pages. |
| */ |
| public class PagesOption extends Option { |
| // values |
| protected int defaultValue; |
| protected int value; |
| |
| /** |
| * Create a new pages option. |
| * |
| * @param set The option set this option belongs to. |
| * @param name The space separated name for the option. |
| * @param desc The purpose of the option |
| * @param defaultPages The default value of the option. |
| */ |
| protected PagesOption(OptionSet set, String name, String desc, int defaultPages) { |
| super(set, PAGES_OPTION, name, desc); |
| this.value = this.defaultValue = defaultPages; |
| } |
| |
| /** |
| * Read the current value of the option in pages. |
| * |
| * @return The option value. |
| */ |
| @Uninterruptible |
| public int getPages() { |
| return this.value; |
| } |
| |
| /** |
| * Read the current value of the option in bytes. |
| * |
| * @return The option value. |
| */ |
| @Uninterruptible |
| public Extent getBytes() { |
| return set.pagesToBytes(this.value); |
| } |
| |
| /** |
| * Read the default value of the option in bytes. |
| * |
| * @return The default value. |
| */ |
| @Uninterruptible |
| public Extent getDefaultBytes() { |
| return set.pagesToBytes(this.defaultValue); |
| } |
| |
| /** |
| * Read the default value of the option in pages. |
| * |
| * @return The default value. |
| */ |
| @Uninterruptible |
| public int getDefaultPages() { |
| return this.defaultValue; |
| } |
| |
| /** |
| * Update the value of the option, echoing the change if logChanges is set. |
| * A warning is raised if the value is not a whole multiple of pages, and |
| * then the validate method is called to allow subclasses to perform any |
| * additional validation. |
| * |
| * @param value The new value for the option. |
| */ |
| public void setBytes(Extent value) { |
| int pages = set.bytesToPages(value); |
| warnIf(value.NE(set.pagesToBytes(pages)), "Value rounded up to a whole number of pages"); |
| setPages(pages); |
| } |
| |
| /** |
| * Update the value of the option, echoing the change if logChanges is set. |
| * The validate method is called to allow subclasses to perform any additional |
| * validation. |
| * |
| * @param pages The new value for the option. |
| */ |
| public void setPages(int pages) { |
| this.value = pages; |
| validate(); |
| set.logChange(this); |
| } |
| |
| /** |
| * Modify the default value of the option. |
| * |
| * @param value The new default value for the option. |
| */ |
| public void setDefaultPages(int value) { |
| this.value = this.defaultValue = value; |
| } |
| } |