System_Software_And_Operating_System_Laboratory/05.Machine_Code.java at master · vtucs/System_Software_And_Operating_System_Laboratory · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
/*
5. Design, develop and implement a C/Java program to generate the machine code using
Triples for the statement A = -B * (C +D) whose intermediate code in three-address
form:
T1 = -B
T2 = C + D
T3 = T1 + T2
A = T3
*/

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner;

class MachineCode {
    public static void main(String[] args) throws IOException {
        File file = new File("input.txt");
        Scanner scanner = new Scanner(file);
        PrintWriter printWriter = new PrintWriter("output.txt");
        while (scanner.hasNextLine()) {
            String[] fields = scanner.nextLine().split(" ");
            if (fields.length == 2) {
                printWriter.println(String.format("LD R0, %s", fields[1]));
                printWriter.println(String.format("ST %s, R0", fields[0]));
            } else if (fields.length == 4) {
                printWriter.println(String.format("LD R0, %s", fields[1]));
                switch (fields[2]) {
                    case "+":
                        printWriter.println(String.format("ADD R0, %s", fields[3]));
                        break;
                    case "-":
                        printWriter.println(String.format("SUB R0, %s", fields[3]));
                        break;
                    case "*":
                        printWriter.println(String.format("MUL R0, %s", fields[3]));
                        break;
                    case "/":
                        printWriter.println(String.format("DIV R0, %s", fields[3]));
                        break;
                    default:
                        printWriter.println("Unsupported Operator");
                }
                printWriter.println(String.format("ST %s, R0", fields[0]));
            }
        }
        printWriter.close();
    }
}

/*
>>> cat input.txt
T1 -B
T2 C + D
T3 T1 + T2
A T3

>>> cat output.txt
LD R0, -B
ST T1, R0
LD R0, C
ADD R0, D
ST T2, R0
LD R0, T1
ADD R0, T2
ST T3, R0
LD R0, T3
ST A, R0
*/