Compiler Milestone | Course Project CS335 .

The goal of this project was to implement a compilation toolchain, where the input is in Java language and the output is x86_64 code. And test the correctness and execution of the generated assembly code using the GNU assembler invoked using as or gcc.

Instructions to run

1. Go to the src directory. Run the following command to remove previous generated files and compile the required ones:

   foo@bar:~$ make clean

   foo@bar:~$ make

   final is the executable.

2. For the command line executions, write

   foo@bar:~$ ./final −h

   This will show you all the commands which can be given along with ./final

   • -i: For getting the input file, as -i=”FileName”
   • -o: For obtaining the output file, as -o=”FileName”
   • -h: will show all the commands and there uses to the user
   • -v: will show the version of the program
   • −−verbose: it will tell, what all has happened through the execution of final.
   

3. To run the program, use the following command, where Source File is test.java and the output dot file is out.dot

   foo@bar:~$ ./final −i ="test.java" −o="out.dot"

4. To print the graph, use following command, where the dot file is out.dot and the graph will be in graph.ps

   foo@bar:~$ dot −Tps −o graph . ps out . dot

5. The symbol table, 3AC dump and the x86 64 assembly code can be found in file SymbolTable.csv, 3ac.txt and out.s respectively in src directory

6. Running the below command will test the out.s

   foo@bar:~$ gcc −no−pie out.s && ./a.out

Features Implemented

• PRIMITIVE TYPES
• MULTIDIMENSIONAL ARRAYS (ANY DIMENSION)
• BASIC OPERATORS
• METHOD DECLARATION AND INVOCATION
• FUNCTIONS, RECURSION AND CONTROL FLOW (IF-ELSE, FOR, WHILE)
• CLASSES AND OBJECTS
• SUPPORT FOR PRINTLN

Procedure

Example

Input.java

public class Example1 {
    int x = 1 + 20/4;
    int y  = x << 2;
    int k = y+1;
    public int setX(int k2){
      this.x = k2;
      return k2;
    }
    Example1(int a, int b) {
        this.x = a;
        this.y = b;
    }
    public int viewX(Example1 pp) {
        return pp.x;
    }

  
    public static void main() {
        int arr[] = new int[10];
        Example1 a = new Example1(29,3);
        Example1 b = new Example1(5, 10);
        int temp = a.setX(1000);
        int c = b.x;
        a.x = 1;
        int d = a.k;
        int m = viewX(a);
        println_m();
    }
  }

Output

1

Compiled Successfully...

:Slightly Smiling Face: 😄