Implement missing shims for Windows

[RalfJung]

Here we track shims that Miri currently only implements for Linux and macOS targets, but not for Windows.

If you run into this, try cargo miri test --target x86_64-unknown-linux-gnu. This works even on a Windows host (without installing anything extra) and interprets programs on a well-supported Linux target.

• File system access (Windows file system shims are missing #3482)
• Threading
• std::thread::sleep
• std::sync
• Console functions (Windows console API shims are missing #2652)

[mbyt]

Miri is great project, thanks!

I am trying to use miri on a regression test on windows, which uses fs::read_to_string. When doing so, I get an error

can't call foreign function `CreateFileW` on OS `windows`

To my understanding from this issue is that file system access is still not implemented for windows (it was added for Unix platforms 2019 in #923.

Is there a workaround for reading a regression reference in windows, such that miri does not complain (unfortunately I cannot use include_str! as it takes a string literal as argument)?

[parasyte]

@mbyt You may get further along with miri just by running it under WSL. There are other issues you may run into, especially if there is any FFI outside of what std does. (That's #2365)

[RalfJung]

@mbyt you can run Miri with --target x86_64-unknown-linux-gnu. This works on Windows without WSL and without installing anything extra. Miri can then use its Linux support for file system access to emulate what the program does, and it should largely work for accessing Windows file systems as well. Please report an issue (a new issue) if it does not.

[RalfJung]

Since most of the small things are done now, I'll close this issue in favor of one that is specifically about file system access: #3482.