Enable permissive provenance by default
This completes the plan laid out in https://github.com/rust-lang/miri/issues/2133:
- We use permissive provenance with wildcard pointers by default.
- We print a warning on int2ptr casts. `-Zmiri-permissive-provenance` suppresses the warning; `-Zmiri-strict-provenance` turns it into a hard error.
- Raw pointer tagging is now always enabled, so we remove the `-Zmiri-tag-raw-pointers` flag and the code for untagged pointers. (Passing the flag still works, for compatibility -- but we just ignore it, with a warning.)
We also fix an intptrcast issue:
- Only live allocations are considered when computing the AllocId from an address.
So, finally, Miri has a good story for ptr2int2ptr roundtrips *and* no weird false negatives when doing raw pointer stuff with Stacked Borrows. :-) 🎉 Thanks a lot to everyone who helped with this, in particular `@carbotaniuman` who convinced me this is even possible.
Fixes https://github.com/rust-lang/miri/issues/2133
Fixes https://github.com/rust-lang/miri/issues/1866
Fixes https://github.com/rust-lang/miri/issues/1993
add -Zmiri-report-progress to regularly print a stacktrace of what we are executing
Fixes https://github.com/rust-lang/miri/issues/910
The stacktrace is printed every N basic blocks. I picked the default (1 million) to take a few seconds on my machine, but it can be adjusted by the user.
test that futexes induce appropriate synchronization
This fails when I remove the `validate_lock_acquire` or `validate_lock_release` from `futex_wake`. So finally we got those code paths actually covered in tests. :)
Actually pass through the request for --color=always
https://github.com/rust-lang/miri/pull/2243 actually doesn't work 😂
The suggestion to split on `,` was good but `arg` is actually the whole `--json=diagnostic-rendered-ansi,artifacts,future-incompat
`, and of course I didn't test that change locally and we have no test for this in CI.
Therefore, I would like some guidance on making a test for this because I'm going to rely on this working.
