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soot.coffi.Instruction_Iinc Maven / Gradle / Ivy

package soot.coffi;

/*-
 * #%L
 * Soot - a J*va Optimization Framework
 * %%
 * Copyright (C) 1997 Clark Verbrugge
 * %%
 * This program 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 program 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 General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

/**
 * 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)
  • *
* * @author Clark Verbrugge * @see Instruction * @see Instruction_noargs * @see Instruction_byte * @see Instruction_bytevar * @see Instruction_byteindex * @see Instruction_int * @see Instruction_intvar * @see Instruction_intindex * @see Instruction_intbranch * @see Instruction_longbranch * @see Instruction_Unknown */ class Instruction_Iinc extends Instruction_bytevar { public int arg_c; public Instruction_Iinc() { super((byte) ByteCode.IINC); name = "iinc"; } public String toString(cp_info constant_pool[]) { return super.toString(constant_pool) + argsep + arg_c; } public int nextOffset(int curr) { return super.nextOffset(curr) + ((isWide) ? 2 : 1); } public int parse(byte bc[], int index) { index = super.parse(bc, index); if (!isWide) { arg_c = bc[index]; return index + 1; } else { int constbyte1 = (bc[index]) & 0xff; int constbyte2 = (bc[index + 1]) & 0xff; arg_c = (short) ((constbyte1 << 8) | constbyte2); return index + 2; } } public int compile(byte bc[], int index) { index = super.compile(bc, index); bc[index] = (byte) (arg_c & 0xff); return index + 1; } }




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