org.eclipse.jdt.internal.compiler.codegen.ExceptionLabel Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2000, 2009 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.codegen;
import org.eclipse.jdt.core.compiler.CharOperation;
import org.eclipse.jdt.internal.compiler.lookup.TypeBinding;
public class ExceptionLabel extends Label {
public int ranges[] = {POS_NOT_SET,POS_NOT_SET};
public int count = 0; // incremented each time placeStart or placeEnd is called
public TypeBinding exceptionType;
public ExceptionLabel(CodeStream codeStream, TypeBinding exceptionType) {
super(codeStream);
this.exceptionType = exceptionType;
}
public void place() {
// register the handler inside the codeStream then normal place
this.codeStream.registerExceptionHandler(this);
this.position = this.codeStream.getPosition();
}
public void placeEnd() {
int endPosition = this.codeStream.position;
if (this.ranges[this.count-1] == endPosition) { // start == end ?
// discard empty exception handler
this.count--;
} else {
this.ranges[this.count++] = endPosition;
}
}
public void placeStart() {
int startPosition = this.codeStream.position;
if (this.count > 0 && this.ranges[this.count-1] == startPosition) { // start == previous end ?
// reopen current handler
this.count--;
return;
}
// only need to grow on even additions (i.e. placeStart only)
int length;
if (this.count == (length = this.ranges.length)) {
System.arraycopy(this.ranges, 0, this.ranges = new int[length*2], 0, length);
}
this.ranges[this.count++] = startPosition;
}
public String toString() {
String basic = getClass().getName();
basic = basic.substring(basic.lastIndexOf('.')+1);
StringBuffer buffer = new StringBuffer(basic);
buffer.append('@').append(Integer.toHexString(hashCode()));
buffer.append("(type=").append(this.exceptionType == null ? CharOperation.NO_CHAR : this.exceptionType.readableName()); //$NON-NLS-1$
buffer.append(", position=").append(this.position); //$NON-NLS-1$
buffer.append(", ranges = "); //$NON-NLS-1$
if (this.count == 0) {
buffer.append("[]"); //$NON-NLS-1$
} else {
for (int i = 0; i < this.count; i++) {
if ((i & 1) == 0) {
buffer.append("[").append(this.ranges[i]); //$NON-NLS-1$
} else {
buffer.append(",").append(this.ranges[i]).append("]"); //$NON-NLS-1$ //$NON-NLS-2$
}
}
if ((this.count & 1) == 1) {
buffer.append(",?]"); //$NON-NLS-1$
}
}
buffer.append(')');
return buffer.toString();
}
}