add `ecx.probe_candidate`
Not yet changing the candidate source to an enum because that would be more involved, but this by itself should already be a significant improvement imo
r? `@BoxyUwU`
Rollup of 5 pull requests
Successful merges:
- #113192 (`assemble_candidates_after_normalizing_self_ty` docs)
- #113251 (Use scoped-tls for SMIR to map between TyCtxt and SMIR datastructures)
- #113282 (Update platform-support.md to improve ARM target descriptions)
- #113296 (add flag for enabling global cache usage for proof trees and printing proof trees on error)
- #113324 (implement `ConstEvaluatable` goals in new solver)
r? `@ghost`
`@rustbot` modify labels: rollup
Replace `mk_const` with `Const::new_x` methods
Part of rust-lang/compiler-team#616. Instead of just havign `Const::new(` and nothing else I did it like this since this is more like how the `mk_x` works for `Ty`, and also another PR of mine will require changing from `Const::new(` to `Const::new_x(` anyway.
r? `@oli-bok`
implement `ConstEvaluatable` goals in new solver
this only supports stable const generics. `feature(generic_const_exprs)` needs to extend that function is non-trivial ways. Leaving this for someone else or some later date.
r? `@BoxyUwU`
add flag for enabling global cache usage for proof trees and printing proof trees on error
This adds a few new things:
- `-Zdump-solver-proof-tree=always/never/on-error`
- `always`/`never` were previosuly specifiable by whether the flag exists or not, th new flag is `on_error` which reruns obligations of fulfillment and selection errors with proof tree generation enabled and prints them out
- `-Zdump-solver-proof-tree-uses-cache`
- allows forcing global cache to be used or unused for all generated proof trees, global cache is enabled by default for `always` so that it accurately represents what happend. This flag currently would affect misc uses of `GenerateProofTree::Yes` which will be added in the future for things like diagnostics logic and rustdoc's auto_trait file. We can fix this when we start using proof tree generation for those use cases if it's desirable.
I also changed the output to go straight to stdout instead of going through `debug!` so that `-Zdump-solver-proof-tree` can be adequately used on `nightly` not just a locally built toolchain.
The idea for `on-error` is that it should hopefully make it easier to quickly figure out "why doesnt this code compile"- you just pass in `-Zdump-solver-proof-tree=on-error` and you'll only get proof trees you care about.
---
r? `@lcnr` `@compiler-errors`
Update platform-support.md to improve ARM target descriptions
Updates the descriptions of the various ARM targets in platform-support.md so they are a little more consistent.
For example, all instances of ARMv7 are changed to ARMv7-A (as opposed to ARMv7-R and ARMv7-M). I also remove the Cortex-Mx CPUs on the thumbv6/7m targets, as most of the other targets refer only to CPU architectures and not specific CPUs (and the list was missing on thumbv8m anyway, so this is more consistent).
`assemble_candidates_after_normalizing_self_ty` docs
I already explained that in different places a few times, should have added that explanation as a doc comment the first time I did so :3
r? `@BoxyUwU`
Remove chalk support from the compiler
Removes chalk (`-Ztrait-solver=chalk`) from the compiler and prunes any dead code resulting from this, mainly:
* Remove the chalk compatibility layer in `compiler/rustc_traits/src/chalk`
* Remove the chalk flag `-Ztrait-solver=chalk` and its `TraitEngine` implementation
* Remove `TypeWellFormedFromEnv` (and its many `bug!()` match arms)
* Remove the chalk migration mode from compiletest
* Remove the `chalkify` UI tests (do we want to keep any of these, but migrate them to `-Ztrait-solver=next`??)
Fulfills rust-lang/types-team#93.
r? `@jackh726`
Upgrade to indexmap 2.0.0
The new version was already added to the tree as an indirect dependency
in #113046, but now our direct dependents are using it too.
Make RPITITs assume/require their parent method's predicates
Removes a FIXME from the `param_env` query where we were manually adding the parent function's predicates to the RPITIT's assumptions.
r? `@spastorino`
lint/ctypes: ext. abi fn-ptr in internal abi fn
Fixes#94223.
- In the improper ctypes lint, instead of skipping functions with internal ABIs, check that the signature doesn't contain any fn-ptr types with external ABIs that aren't FFI-safe.
- When computing the ABI for fn-ptr types, remove an `unwrap` that assumed FFI-safe types in foreign fn-ptr types.
- I'm not certain that this is the correct approach.
Implement selection via new trait solver
Implements selection via the new solver by calling into `assemble_and_evaluate_candidates`, doing a very light-weight "winnow" to choose one candidate over the others, and then re-confirming that candidate outside of the `EvalCtxt` in order to compute the information necessary for the `ImplSource`.
This selection routine is best effort -- if it receives an ambiguous response from the `EvalCtxt`, then it may return ambiguity if the work to re-confirm the goal is not "easy" -- right now, that means everything except for object and impl goals. Since we don't want to reimplement all of the work of the `compute_builtin_*` methods in the solver internals, we bail out if we encounter ambiguity more often than the old solver. This should only barely affect [method selection](f798ada7ba/compiler/rustc_hir_typeck/src/method/probe.rs (L1447)) and not codegen. It can be made more precise later if needed.
r? `@lcnr`
Revert "Suggest `x build library` for a custom toolchain that fails to load `core`"
This reverts commit b913f5593d.
CI builds with profile=nightly, causing different test output.
Making the output depend on the release channel was not a great idea and we have to be more careful with this.
I did not realize that the change could have such effects on test output but it's kinda obvious with hindsight >.<.
This reverts commit b913f5593d.
CI builds with profile=nightly, causing different test output.
Making the output depend on the release channel was not a great idea.
Extend previous checks for external ABI fn-ptrs to use in internal
statics, constants, type aliases and algebraic data types.
Signed-off-by: David Wood <david.wood@huawei.com>
Extend previous commit's support for checking for external fn-ptrs in
internal fn types to report errors for multiple found fn-ptrs.
Signed-off-by: David Wood <david.wood@huawei.com>
Instead of skipping functions with internal ABIs, check that the
signature doesn't contain any fn-ptr types with external ABIs that
aren't FFI-safe.
Signed-off-by: David Wood <david.wood@huawei.com>
