52b1b342ab
This PR implements zero cost `BaseIO` by erasing the `IO.RealWorld` parameter from argument lists and structures. This is a **major breaking change for FFI**. Concretely: - `BaseIO` is defined in terms of `ST IO.RealWorld` - `EIO` (and thus `IO`) is defined in terms of `EST IO.RealWorld` - The opaque `Void` type is introduced and the trivial structure optimization updated to account for it. Furthermore, arguments of type `Void s` are removed from the argument lists of the C functions. - `ST` is redefined as `Void s -> ST.Out s a` where `ST.Out` is a pair of `Void s` and `a` This together has the following major effects on our generated code: - Functions that return `BaseIO`/`ST`/`EIO`/`IO`/`EST` now do not take the dummy world parameter anymore. To account for this FFI code needs to delete the dummy world parameter from the argument lists. - Functions that return `BaseIO`/`ST` now return their wrapped value directly. In particular `BaseIO UInt32` now returns a `uint32_t` instead of a `lean_object*`. To account for this FFI code might have to change the return type and does not need to call `lean_io_result_mk_ok` anymore but can instead just `return` values right away (same with extracting values from `BaseIO` computations. - Functions that return `EIO`/`IO`/`EST` now only return the equivalent of an `Except` node which reduces the allocation size. The `lean_io_result_mk_ok`/`lean_io_result_mk_error` functions were updated to account for this already so no change is required. Besides improving performance by dropping allocation (sizes) we can now also do fun new things such as: ```lean @[extern "malloc"] opaque malloc (size : USize) : BaseIO USize ```
17 lines
560 B
Text
17 lines
560 B
Text
[Compiler.saveMono] size: 12
|
|
def f b a.1 : EST.Out IO.Error lcAny PUnit :=
|
|
jp _jp.2 a _y.3 : EST.Out IO.Error lcAny PUnit :=
|
|
let _x.4 := print a _y.3;
|
|
cases _x.4 : EST.Out IO.Error lcAny PUnit
|
|
| EST.Out.ok a.5 a.6 =>
|
|
let _x.7 := print a a.6;
|
|
return _x.7
|
|
| EST.Out.error a.8 a.9 =>
|
|
return _x.4;
|
|
cases b : EST.Out IO.Error lcAny PUnit
|
|
| Bool.false =>
|
|
let _x.10 := 1;
|
|
goto _jp.2 _x.10 a.1
|
|
| Bool.true =>
|
|
let _x.11 := 0;
|
|
goto _jp.2 _x.11 a.1
|