[LLVM17] Adapt to `ExplicitEmulatedTLS` removal.
0d333bf0e3 removed the `ExplicitEmulatedTLS` field from `TargetOptions`.
Before that commit, `TargetMachine::useEmulatedTLS()` fell back to `TheTriple.hasDefaultEmulatedTLS()` if `ExplicitEmulatedTLS` was `false`/unset.
After that commit, `TargetMachine::useEmulatedTLS()` directly returns `Options.EmulatedTLS`, and the fallback to `TheTriple.hasDefaultEmulatedTLS()` was moved to `InitTargetOptionsFromCodeGenFlags`.
Since `rustc` does not use `InitTargetOptionsFromCodeGenFlags` (AFAICT) and instead manually builds `TargetOptions`, this PR initializes `EmulatedTLS` to `TheTriple.hasDefaultEmulatedTLS()`.
(I'm not really familiar with the details of what this option does, or if there are any tests that depend on `hasDefaultEmulatedTLS` being used correctly, so this PR is mostly untested (it does compile against LLVM17, though)).
`@rustbot` label: +llvm-main
Break up long function in trait selection error reporting + clean up nearby code
- Move blocks of code into their own functions
- Replace a few function argument types with their type aliases
- Create "AppendConstMessage" enum to replace a nested `Option`.
Add size asserts for MIR `SourceScopeData` & `VarDebugInfo`
There's vectors of both of these in `mir::Body`, so might as well track them.
(I was pondering adding something to one or the other, so wanted this to see the memory impact.)
Normalize types and consts in MIR opts.
Some passes were using a non-RevealAll param_env, which is needlessly restrictive in mir-opts.
As a drive-by, we normalize all constants, since just normalizing their types is not enough.
Add `intrinsics::transmute_unchecked`
This takes a whole 3 lines in `compiler/` since it lowers to `CastKind::Transmute` in MIR *exactly* the same as the existing `intrinsics::transmute` does, it just doesn't have the fancy checking in `hir_typeck`.
Added to enable experimenting with the request in <https://github.com/rust-lang/rust/pull/106281#issuecomment-1496648190> and because the portable-simd folks might be interested for dependently-sized array-vector conversions.
It also simplifies a couple places in `core`.
See also https://github.com/rust-lang/rust/pull/108442#issuecomment-1474777273, where `CastKind::Transmute` was added having exactly these semantics before the lang meeting (which I wasn't in) independently expressed interest.
Impl `Copy` for most HIR types
This simplifies the invocation of the `arena_types` macro and probably
makes working with HIR nicer in general.
Based on #109588
Fix printing native CPU on cross-compiled compiler.
If `rustc` is cross-compiled from a different host, then the "native" entry in `rustc --print=target-cpus` would not appear. There is a check in the printing code that will avoid printing the "native" entry if the user has passed `--target`. However, that check was comparing the `--target` value with the `LLVM_TARGET_TRIPLE` which is the triple of the host that `rustc` was built on (the "build" target in Rust lingo), not the target it was being built for (the "host" in Rust lingo). This fixes it to use the target that LLVM was built for (which I'm pretty sure this is the correct function to determine that).
This fixes the cpu listing for aarch64-apple-darwin which is built on CI using the x86_64-apple-darwin host.
