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package ch.epfl.lamp.fjbg;
import java.util.*;
import java.io.*;
/**
* Code attribute, containing code of methods.
*
* @author Michel Schinz
* @version 1.0
*/
public class JCodeAttribute extends JAttribute {
protected final JCode code;
public JCodeAttribute(FJBGContext context, JClass clazz, JMethod owner) {
super(context, clazz);
this.code = owner.getCode();
assert clazz == owner.getOwner();
}
public JCodeAttribute(FJBGContext context,
JClass clazz,
Object owner,
String name,
int size,
DataInputStream stream)
throws IOException {
super(context, clazz);
stream.readShort(); // skip max stack size
stream.readShort(); // skip max locals
this.code = context.JCode(clazz, (JMethod)owner, stream);
int handlersCount = stream.readShort();
for (int i = 0; i < handlersCount; ++i)
code.addExceptionHandler(code.new ExceptionHandler(stream));
List/*<JAttribute>*/ attributes =
JAttribute.readFrom(context, clazz, owner, stream);
Iterator attrIt = attributes.iterator();
while (attrIt.hasNext())
code.addAttribute((JAttribute)attrIt.next());
assert name.equals(getName());
}
public String getName() { return "Code"; }
protected int getSize() {
int handlersNum = code.getExceptionHandlers().size();
int attrsSize = 0;
Iterator attrsIt = code.getAttributes().iterator();
while (attrsIt.hasNext()) {
JAttribute attr = (JAttribute)attrsIt.next();
attrsSize += attr.getSize() + 6;
}
return 2 // max stack
+ 2 // max locals
+ 4 // code size
+ code.getSize() // code
+ 2 // exception table size
+ 8 * handlersNum // exception table
+ 2 // attributes count
+ attrsSize; // attributes
}
protected void writeContentsTo(DataOutputStream stream) throws IOException {
List/*<JExceptionHandler>*/ handlers = code.getExceptionHandlers();
stream.writeShort(code.getMaxStackSize());
stream.writeShort(code.getOwner().getMaxLocals());
code.writeTo(stream);
stream.writeShort(handlers.size());
Iterator handlerIt = handlers.iterator();
while (handlerIt.hasNext())
((JCode.ExceptionHandler)handlerIt.next()).writeTo(stream);
JAttribute.writeTo(code.getAttributes(), stream);
}
}
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