C--

A compiler written in Ocaml for programming language C-- (C minus minus)

Requirements

Install Ocaml: https://ocaml.org/learn/tutorials/up_and_running.html.

Instructions

Generate Ocaml lexer and parser for compiler

make cmm && make tac

To compile file (running this command will create new file with the same name with .tac at the end)

./cmm [filename]

To run compiled file (.tac file)

./tac [filename]

You can also use this command to compile and run file at the same time

python compile_cmm.py [filename]

Features

Sample cmm files are contained in examples directory.

• Simple mathematical calculations and operators: addition, subtraction, multiplication, division, and, or.
• Conditional statement: if - else.
• Loop: while loop.

Expressions

Declare and return varibles/values.

x = 1;
return 1;

return (1 + 2) - 3 * 4 / 2;

a = 1 + 2;
b = a * 3;
c = (b + 1) / 2 + a;
return (c - 1);

Conditional statement

If-else statement

a = 5;
if (a < 10)
{
  b = 1;
}
else
{
  b = 2;
}

return b;

if ((1 < 2) && ((5 < 8) || (2 < 1)))
{
  if ((2 < 1) && (0 <= 1))
  {
    b = 1;
  }
  else
  {
    b = 2;
  }
}
else
{
  b = 3;
}
return b;

Loop

While loop

n = 5;
fact = 1;
while (n >= 1)
{
  fact = fact * n;
  n = n - 1;
}
return fact;