Add support for macOS + make architecture dependent section smaller

[juniorrantila]

This PR adds support for macOS, where the main difference is that all functions have a leading underscore. I also made the target specific assembly section smaller by combining the yield functions in to one. This is possible since the order of the function arguments are the same.

[0dminnimda]

Since you changed the coroutine_switch_context signature, wouldn't linux version stop working?

[juniorrantila]

Since you changed the coroutine_switch_context signature, wouldn't linux version stop working?

No, it should still work as it did before, since I added an ifdef. I don't have a Linux machine unfortunately, so can't test it, but I'm fairly confident. Feel free to test it though.

[0dminnimda]

I feels like they're too many changes, which don't contribute to adding macos support, like renaming functions, changing their signatures, extracting some operations. Focusing on one chance at a time is much better for pull requests, it's easier to understand for reviewers, it's simpler. So one PR for macos inwhich you literally copy paste things several times, another one for refactoring code, so you don't repeat things so often.

[juniorrantila]

@0dminnimda Not to be bleak, but in its entirety, this PR is just a couple dozen lines. Though, GitHub diffs can be jarring at times, especially when it comes to macros. If you want to read the code, I encourage you to use the commit view instead, it's usually easier to manage and has the added context of commit messages.

Other than that, this is just something I threw together this morning in a recreational programming session. Tsozin has no obligation to merge any of it nor all of it. He could close the PR with "TLDR" as message for all I care. ¯_(ツ)_/¯

I dare you, double dare you @rexim

[rexim]

TLDR is the new LGTM /j

I'll look into this a bit later

[0dminnimda]

it would be cool for this to be merged, that's all

[0dminnimda]

I ran it and it actually does work on linux as well, looking through code (not in diff view 😅), I got your idea! It is neat to reuse the first and second argument of yield() as 1 and 2 args of coroutine_switch_context, this way you only have to add the missing third argument, smart!