The `backtrace-rs` crate can use this to implement
`Frame::symbol_address`, which is used to skip frames
above the call to `Backtrace::capture` on the stack.
The function pointer will not be useable for comparison purposes if the
function is generic, as CTFE creates a new function pointer for each
cast of a (monomorphized) generic function. However, this already
affects code running under Miri, and isn't a problem for `backtrace-rs`
(which only casts a non-generic function).
I've added logic to allow `MiriFrame` to have either 4 or 5 fields - if
a 5th field is present, we write the function pointer to it.
add bors notification jobs
There are probably ways to simplify this... I just copied this from the Rust repo and expanded the anchors and adjusted the `needs` thing. Hopefully this unblocks Miri PR landing.
Add a dummy actions template to enable it on CI
I already had a complete template to transition from Travis and Appveyor.
Since actions will not run on repo haven't enabled it before.
I have this dummy template first to enable it on default branch.
We should address a few todo here, merge it and I will send another patch
to complete the migration.
check that all syscall arguments are scalars
`@m-ou-se` do you think this check makes sense?
The `abi` of a layout contains everything needed for the calling convention (as far as I know), so this should ensure that all the ignored arguments are passed like integers and do not otherwise mess up argument passing.
The one thing I am not sure about is what happens when more arguments are passed than fit in registers. The `syscall` man page says that all calling conventions support at least 6 arguments, except for "mips/o32" where it says that
```
[1] The mips/o32 system call convention passes arguments 5 through 8 on the user stack.
```
If we assume that passing these extra arguments to futex is legal even with that calling convention, that would mean that those user stack arguments are just silently ignored as well, which seems plausible to me -- but I know very little about calling conventions.
Implement futex_wait and futex_wake.
Fixes https://github.com/rust-lang/rust/issues/77406 and fixes#1562.
This makes std's park(), park_timeout(), and unpark() work. That means std::sync::Once is usable again and the test pass again with the latest rustc.
This also makes parking_lot work.
