Kareido

Yet another LLVM example program, inspired by the official one

Prerequisites

• Ruby (tested with 2.3)
• LLVM (eg. brew install llvm on macOS. Tested with 3.8.1)

How to run

$ bundle install

Make a file a.kar like:

extern i32 putchar(i32);
putchar(65);

$ bundle exec kareido compile a.kar   #=> creates a.ll
$ bundle exec kareido exec a.kar      #=> creates a.ll and run it with lli

How to run test

$ bundle exec rake test

The Language

Comment

// this is comment

Number (all numbers are treated as double)

12345
1.3

Unary operators

-x
(Note: unary + (eg. +x) is not supported)

Binary operators

1 + 2
1 - 2
1 * 2
1 / 2   //=> 0.5
1 < 2   //=> true
1 != 1  //=> false

Conditional

if (x == 1) {
  y = 2
}
else {
  y = 3
}

Loop

for (i = 0, y < 3, +1) {
  x *= 5
}

Extern

// only 'i32' or 'double' is supported
extern i32 putchar(i32);

Function

extern i32 putchar(i32);
func add(x, y) {
  return x + y;
  // Note: 0.0 is returned if `return` is omit in a function definition
}
// main
putchar(add(60, 5));

License

MIT