| /* |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| package org.apache.flex.abc.semantics; |
| |
| |
| /** |
| * A OneOperandInstruction is an instruction that is known to have only one |
| * operand. |
| */ |
| public class OneOperandInstruction extends Instruction |
| { |
| /** |
| * Construct a OneOperandInstruction. |
| * |
| * @param opcode - the instruction's opcode. |
| * @param operand - the instruction's operand. |
| */ |
| public OneOperandInstruction(int opcode, Object operand) |
| { |
| super(opcode); |
| this.operand = operand; |
| } |
| |
| /** |
| * Construct a OneOperandInstruction whose operand is to be filled in later. |
| * |
| * @param opcode - the instruction's opcode. Must be one of the approved |
| * opcodes. |
| */ |
| public OneOperandInstruction(int opcode) |
| { |
| super(opcode); |
| assert (isTargetableInstruction()) : String.format("Invalid deferred operand type %s", super.toString()); |
| } |
| |
| /** |
| * The instruction's operand. |
| */ |
| public Object operand; |
| |
| @Override |
| public String toString() |
| { |
| return String.format("%s[%s]", super.toString(), this.operand); |
| } |
| |
| @Override |
| public int getOperandCount() |
| { |
| return 1; |
| } |
| |
| @Override |
| public boolean hasOperands() |
| { |
| return true; |
| } |
| |
| @Override |
| public Object getOperand(int index) |
| { |
| assert index == 0 : String.format("%s only has one operand, requested %d", super.toString(), index); |
| return this.operand; |
| } |
| |
| /** |
| * Get the target of a branch instruction. |
| * |
| * @return the target label, or null if not present. |
| */ |
| @Override |
| public Label getTarget() |
| { |
| return this.operand instanceof Label ? (Label)this.operand : null; |
| } |
| |
| /** |
| * Set the target of a branch instruction. |
| * |
| * @param target - the AET Label this instruction targets. |
| */ |
| @Override |
| public void setTarget(Label target) |
| { |
| assert this.operand == null : String.format("%s target already set", this); |
| this.operand = target; |
| } |
| } |