Dlang dynamic compilation

[Johan Engelen via digitalmars-d-ldc]

On Thursday, 24 November 2016 at 20:00:11 UTC, Ivan Butygin wrote:
> There are a lot of questions how this feature should interact 
> with PGO/coverage analysis/debug info generation.

I would postpone these 3 issues, and just disable them for now if 
it's too much work. Nice topics for future (!) work. :-)
Can @jit functions write to normal global variables? (DMD-style 
coverage is just that; PGO is more involved because LLVM creates 
the IR instructions for that)

> I need some more intelligent way to replace functions with 
> thunks.

Looking at what you've achieved, I think you are more than 
intelligent enough to come up with a great solution! :-)

Upon emitting a call to a function, you can detect that the 
function is "@jit" and instead emit a functionptr call, right?
I think all that's needed is adding that functionality to `DValue 
*call(...)` in gen/toir.cpp. It already has code for indirect 
calls; so probably all you have to do is add a bit of code to 
load from the function pointer that is written to by 
`rtCompileProcess`.

I didn't check but if there isn't already, the functionptr should 
be initialized with the address of a function that errors and 
tells the user that the function is not yet compiled, _or_ a 
function that starts JIT compilation and calls the desired 
function afterwards.

(Hop on Gitter for an easier discussion of things :-)

-Johan