Mirror of the BLOAT repository
https://www.cs.purdue.edu/homes/hosking/bloat/
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141 lines
3.5 KiB
141 lines
3.5 KiB
/**
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* All files in the distribution of BLOAT (Bytecode Level Optimization and
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* Analysis tool for Java(tm)) are Copyright 1997-2001 by the Purdue
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* Research Foundation of Purdue University. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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package EDU.purdue.cs.bloat.editor;
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/**
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* <tt>Label</tt> is used to label an instruction. <tt>Label</tt>s are used
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* to preserve the location of branch targets. A <tt>Label</tt> consists of an
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* index into the code array and a <tt>boolean</tt> that determines whether or
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* not it starts a basic block.
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*
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* @author Nate Nystrom (<a
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* href="mailto:nystrom@cs.purdue.edu">nystrom@cs.purdue.edu</a>)
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*/
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public class Label {
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public static boolean TRACE = false;
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private int index;
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private boolean startsBlock;
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private String comment; // Comment with Label
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/**
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* Constructor.
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*
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* @param index
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* A unique index for the label. For instance, its offset in the
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* instruction array.
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*/
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public Label(final int index) {
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this(index, false);
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}
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/**
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* Constructor.
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*
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* @param index
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* The index of this label into the instruction array
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* @param startsBlock
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* True if the label is the first instruction in a basic block,
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* false if not.
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*/
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public Label(final int index, final boolean startsBlock) {
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this.index = index;
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this.startsBlock = startsBlock;
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// if(Label.TRACE) {
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// try {
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// throw new Exception("Creating a new label: " + this);
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// } catch(Exception ex) {
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// ex.printStackTrace(System.out);
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// }
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// }
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}
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/**
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* Sets the comment associated with this <tt>Label</tt>.
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*/
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public void setComment(final String comment) {
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this.comment = comment;
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}
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/**
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* Set if the label starts a block.
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*
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* @param startsBlock
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* True if the label starts a block, false if not.
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*/
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public void setStartsBlock(final boolean startsBlock) {
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this.startsBlock = startsBlock;
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}
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/**
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* Check if the label starts a block.
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*
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* @return True if the label starts a block, false if not.
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*/
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public boolean startsBlock() {
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return startsBlock;
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}
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/**
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* Get the index of the label.
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*
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* @return The index of the label.
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*/
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public int index() {
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return index;
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}
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/**
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* Hash the label.
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*
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* @return The hash code.
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*/
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public int hashCode() {
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return index;
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}
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/**
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* Check if an object is equal to this label.
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*
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* @param obj
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* The object to compare against.
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* @return true if equal, false if not.
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*/
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public boolean equals(final Object obj) {
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return ((obj instanceof Label) && (((Label) obj).index == index));
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}
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/**
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* Convert the label to a string.
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*
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* @return A string representation of the label.
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*/
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public String toString() {
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if (comment != null) {
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return "label_" + index + " (" + comment + ")";
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} else {
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return "label_" + index;
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}
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}
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}
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