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/*
* Fernflower - The Analytical Java Decompiler
* http://www.reversed-java.com
*
* (C) 2008 - 2010, Stiver
*
* This software is NEITHER public domain NOR free software
* as per GNU License. See license.txt for more details.
*
* This software is distributed WITHOUT ANY WARRANTY; without
* even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE.
*/
package org.jetbrains.java.decompiler.code;
import java.io.DataOutputStream;
import java.io.IOException;
public class Instruction implements CodeConstants {
// *****************************************************************************
// public fields
// *****************************************************************************
public int opcode;
public int group = CodeConstants.GROUP_GENERAL;
public boolean wide = false;
public int bytecode_version = BYTECODE_JAVA_LE_4;
// *****************************************************************************
// private fields
// *****************************************************************************
private int[] operands = null;
// *****************************************************************************
// public methods
// *****************************************************************************
public Instruction() {}
public int length() {
return 1;
}
public int operandsCount() {
return (operands==null)?0:operands.length;
}
public int getOperand(int index) {
return operands[index];
}
public Instruction clone() {
return ConstantsUtil.getInstructionInstance(opcode, wide, group, bytecode_version, operands==null?null:(int[])operands.clone());
}
public String toString() {
String res = wide?"@wide ":"";
res+="@"+ConstantsUtil.getName(opcode);
int len = operandsCount();
for(int i=0;i<len;i++) {
int op = operands[i];
if(op<0) {
res+=" -"+Integer.toHexString(-op);
} else {
res+=" "+Integer.toHexString(op);
}
}
return res;
}
public boolean canFallthrough() {
return opcode!=opc_goto && opcode!=opc_goto_w && opcode!=opc_ret &&
!(opcode>=opc_ireturn && opcode<=opc_return) && opcode!=opc_athrow
&& opcode!=opc_jsr && opcode!=opc_tableswitch && opcode!=opc_lookupswitch;
}
public boolean equalsInstruction(Instruction instr) {
if(opcode != instr.opcode || wide != instr.wide
|| operandsCount() != instr.operandsCount()) {
return false;
}
if(operands != null) {
for(int i=0;i<operands.length;i++) {
if(operands[i] != instr.getOperand(i)) {
return false;
}
}
}
return true;
}
// should be overwritten by subclasses
public void initInstruction(InstructionSequence seq) {}
// should be overwritten by subclasses
public void writeToStream(DataOutputStream out, int offset) throws IOException {
out.writeByte(opcode);
}
// *****************************************************************************
// getter and setter methods
// *****************************************************************************
public int[] getOperands() {
return operands;
}
public void setOperands(int[] operands) {
this.operands = operands;
}
}
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