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/* FJBG -- Fast Java Bytecode Generator
* Copyright 2002-2013 LAMP/EPFL
* @author Michel Schinz
*/
package ch.epfl.lamp.fjbg;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
/**
* Exceptions attribute
* This table is used by compilers to indicate which Exceptions a method
* is declared to throw. See section 2.6.4 of the JVM specification.
*
* @author Stephane Micheloud
* @version 1.0
*/
public class JExceptionsAttribute extends JAttribute {
/** Constant pool of the current classfile. */
private JConstantPool pool;
protected int[] indexTable;
protected int count;
public JExceptionsAttribute(FJBGContext context,
JClass clazz,
JMethod owner) {
super(context, clazz);
this.pool = clazz.pool;
this.count = 0;
this.indexTable = new int[8]; // some size > count
assert clazz == owner.getOwner();
}
public JExceptionsAttribute(FJBGContext context,
JClass clazz,
Object owner, //JMethod
String name,
int size,
DataInputStream stream)
throws IOException {
super(context, clazz, name);
this.pool = clazz.pool;
this.count = stream.readShort();
this.indexTable = new int[count];
for (int i = 0; i < count; ++i)
indexTable[i] = stream.readShort();
assert name.equals(getName());
}
public void addEntry(int classIndex) {
if (count >= indexTable.length) {
int[] newIT = new int[indexTable.length * 2];
System.arraycopy(indexTable, 0, newIT, 0, indexTable.length);
indexTable = newIT;
}
indexTable[count++] = classIndex;
}
public String getName() { return "Exceptions"; }
// Follows javap output format for Exceptions attribute.
/*@Override*/ public String toString() {
StringBuffer buf = new StringBuffer(" Exceptions: ");
for (int i = 0; i < indexTable.length; ++i) {
buf.append("\n throws ");
buf.append(JClass.toExternalName(pool.lookupClass(indexTable[i])));
}
buf.append("\n");
return buf.toString();
}
protected int getSize() {
return 2 + indexTable.length * 2;
}
protected void writeContentsTo(DataOutputStream stream) throws IOException {
stream.writeShort(count);
for (int i = 0; i < count; ++i)
stream.writeShort(indexTable[i]);
}
}
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