The next language we'll be covering is
IL-CPS, whose purpose is to make
control flow explicit in the syntax of the language.
In particular, this language will have the following three properties:
- No implicit control flow -- procedure calls, returns, exceptions, etc. are all represented as jumps.
- All intermediate values are named.
- Continuations are reified as 1st class values.
To explain the second condition, instead of compound expressions like
in CPS form we would use something akin to
let x' = x+y in x'+z.
There are some compilers whose CPS transformation pass only conforms to the first two conditions. This is known as "A-normal form", or "monadic form". Or, very creatively, "2/3rds CPS".