jas.CatchEntry Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jasmin Show documentation

Java Assembler Interface for the Soot framework

There is a newer version: 3.0.3

/**
 * This class
 * is used to build up entries in a catch table.
 * @see Catchtable
 * @author $Author: fqian $
 * @version $Revision: 1.1 $
 */

package jas;

import java.io.*;

public class CatchEntry
{
  Label start_pc, end_pc, handler_pc;
  CP catch_cpe;
  /**
   * Catch entries are created and then added to the Catchtable.
   * @param start Label marking the beginning of the area
   *       where the catch table is active.
   * @param end Label marking the end of the area where the
   *       table is active.
   * @param handler Label marking the entrypoint into the
   *  exception handling routine.
   * @param cat (usually a classCP) informing the VM to direct
   * any exceptions of this (or its subclasses) to the handler.
   * @see Catchtable
   */
  public
  CatchEntry(Label start, Label end, Label handler, CP cat)
  {
    start_pc = start;
    end_pc = end;
    handler_pc = handler;
    catch_cpe = cat;
  }

  void resolve(ClassEnv e)
  { if (catch_cpe != null) e.addCPItem(catch_cpe); }

  void write(ClassEnv e, CodeAttr ce, DataOutputStream out)
    throws IOException, jasError
  {
    start_pc.writeOffset(ce, null, out);
    end_pc.writeOffset(ce, null, out);
    handler_pc.writeOffset(ce, null, out);
    if (catch_cpe != null)
      { out.writeShort(e.getCPIndex(catch_cpe)); }
    else
      { out.writeShort(0); }
  }
}