Design suitable data structures and implement pass1 of a two pass asmbler
import java.util.*;
import java.io.*;
class TableRow{
String name;
int index;
int address;
TableRow(String name,int address){
super();
this.name=name;
this.address=address;
this.index=0;
}
TableRow(String name,int index,int address){
this.address=address;
this.name=name;
this.index=index;
}
public void setName(String name) {
this.name=name;
}
public void setIndex(int index) {
this.index=index;
}
public void setAddress(int address) {
this.address=address;
}
public String getName() {
return this.name;
}
public int getIndex() {
return this.index;
}
public int getAddress() {
return this.address;
}
}
class Initialize{
HashMap<String,Integer> AD;
HashMap<String,Integer> IS;
HashMap<String,Integer> CC;
HashMap<String,Integer> RG;
HashMap<String,Integer> DL;
Initialize(){
AD=new HashMap<>();
IS=new HashMap<>();CC=new HashMap<>();
RG=new HashMap<>();
DL=new HashMap<>();
AD.put("START",1);
AD.put("END",2);
AD.put("ORIGIN",3);
AD.put("EQU",4);
AD.put("LTORG",5);
DL.put("DC", 1);
DL.put("DS", 2);
RG.put("AREG", 1);
RG.put("BREG", 2);
RG.put("CREG", 3);
RG.put("DREG", 4);
CC.put("LT", 1);
CC.put("LTE",2);
CC.put("EQ", 3);
CC.put("NEQ",4);
CC.put("GT",5);
CC.put("GTE",6);
IS.put("STOP",0);
IS.put("ADD",1);
IS.put("SUB",2);
IS.put("MULT",3);
IS.put("MOVER",4);
IS.put("MOVEM",5);
IS.put("COMP",6);
IS.put("BC",7);
IS.put("DIV",8);
IS.put("READ", 9);
IS.put("PRINT",10);
}
}
class assembler {
public static void main(String args[]) throws IOException{
BufferedReader br=new BufferedReader(new FileReader("input.txt"));
FileWriter pass1=new FileWriter("pass1.txt");
FileWriter symtab=new FileWriter("symtab.txt");
Initialize in=new Initialize();
int symindex=0;
int index=0;
String line;int flag=0;
while((line=br.readLine())!=null) {
String parts[]=line.split("\\s+");
for(int i=0;i<parts.length;i++) {
parts[i]=parts[i].replaceAll(",","");
if((in.AD.containsKey(parts[i]))==false) {
if((in.CC.containsKey(parts[i]))==false) {
if((in.DL.containsKey(parts[i]))==false){
if((in.IS.containsKey(parts[i]))==false) {
if((in.RG.containsKey(parts[i]))==false) {
symtab.write(parts[i]+"\t"+ +
+symindex+"\n");
}
}
}
}
}
}
}
symtab.close();
br.close();
pass1.close();
}
}
INPUT:
START 100
L1 MOVER AREG, X
MOVEM AREG, Y
ORIGIN L1+3
NEXT ADD AREG, X
SUB BREG, Y
BC LT, L1
ORIGIN NEXT+5
MULT CREG, Z
STOP
X DS 2
Y DS 1
Z DC '9'
END