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 /* Soot - a J*va Optimization Framework
  * Copyright (C) 1997 Clark Verbrugge
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
/*
 * Modified by the Sable Research Group and others 1997-1999.  
 * See the 'credits' file distributed with Soot for the complete list of
 * contributors.  (Soot is distributed at http://www.sable.mcgill.ca/soot)
 */
package soot.coffi;
Instruction subclasses are used to represent parsed bytecode; each bytecode operation has a corresponding subclass of Instruction.

Each subclass is derived from one of

  • Instruction
  • Instruction_noargs (an Instruction with no embedded arguments)
  • Instruction_byte (an Instruction with a single byte data argument)
  • Instruction_bytevar (a byte argument specifying a local variable)
  • Instruction_byteindex (a byte argument specifying a constant pool index)
  • Instruction_int (an Instruction with a single short data argument)
  • Instruction_intvar (a short argument specifying a local variable)
  • Instruction_intindex (a short argument specifying a constant pool index)
  • Instruction_intbranch (a short argument specifying a code offset)
  • Instruction_longbranch (an int argument specifying a code offset)

   public int arg_i;
   public Instruction_intindex(byte c) { super(c); }
   public String toString(cp_info constant_pool[]) {
      return super.toString(constant_pool) +  + "[" +
         constant_pool[].toString(constant_pool) + "]";
   }
   public int nextOffset(int curr) { return curr+3; }
   public void markCPRefs(boolean[] refs) { refs[] = true; }
   public void redirectCPRefs(short redirect[]) {  = redirect[]; }
   public int parse(byte bc[],int index) {
       = getShort(bc,index);
      return index+2;
   }
   public int compile(byte bc[],int index) {
      bc[index++] = ;
      shortToBytes((short),bc,index);
      return index+2;
   }
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