Commit Graph

1085 Commits

Author SHA1 Message Date
Maybe Waffle
904dd2c398 Bless tidy 2023-03-27 18:58:07 +00:00
Scott McMurray
0439d13176 Refactor: VariantIdx::from_u32(0) -> FIRST_VARIANT
Since structs are always `VariantIdx(0)`, there's a bunch of files where the only reason they had `VariantIdx` or `vec::Idx` imported at all was to get the first variant.

So this uses a constant for that, and adds some doc-comments to `VariantIdx` while I'm there, since it doesn't have any today.
2023-03-25 18:58:25 -07:00
bors
e216300876 Auto merge of #108442 - scottmcm:mir-transmute, r=oli-obk
Add `CastKind::Transmute` to MIR

~~Nothing actually produces it in this commit, so I don't know how to test it, but it also means it shouldn't be possible for it to break anything.~~

Includes lowering `transmute` calls to it, so it's used.

Zulip Conversation: <https://rust-lang.zulipchat.com/#narrow/stream/189540-t-compiler.2Fwg-mir-opt/topic/Good.20first.20isssue/near/321849610>
2023-03-23 18:43:04 +00:00
bors
99c49d95cd Auto merge of #109517 - matthiaskrgr:rollup-m3orqzd, r=matthiaskrgr
Rollup of 7 pull requests

Successful merges:

 - #108541 (Suppress `opaque_hidden_inferred_bound` for nested RPITs)
 - #109137 (resolve: Querify most cstore access methods (subset 2))
 - #109380 (add `known-bug` test for unsoundness issue)
 - #109462 (Make alias-eq have a relation direction (and rename it to alias-relate))
 - #109475 (Simpler checked shifts in MIR building)
 - #109504 (Stabilize `arc_into_inner` and `rc_into_inner`.)
 - #109506 (make param bound vars visibly bound vars with -Zverbose)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
2023-03-23 12:35:05 +00:00
Matthias Krüger
7afed92749
Rollup merge of #109475 - scottmcm:simpler-shifts, r=WaffleLapkin
Simpler checked shifts in MIR building

Doing masking to check unsigned shift amounts is overcomplicated; just comparing the shift directly saves a statement and a temporary, as well as is much easier to read as a human.  And shifting by unsigned is the canonical case -- notably, all the library shifting methods (that don't support every type) take shift RHSs as `u32` -- so we might as well make that simpler since it's easy to do so.

This PR also changes *signed* shift amounts to `IntToInt` casts and then uses the same check as for unsigned.  The bit-masking is a nice trick, but for example LLVM actually canonicalizes it to an unsigned comparison anyway <https://rust.godbolt.org/z/8h59fMGT4> so I don't think it's worth the effort and the extra `Constant`.  (If MIR's `assert` was `assert_nz` then the masking might make sense, but when the `!=` uses another statement I think the comparison is better.)

To review, I suggest looking at 2ee0468c49 first -- that's the interesting code change and has a MIR diff.

My favourite part of the diff:
```diff
-        _20 = BitAnd(_19, const 340282366920938463463374607431768211448_u128); // scope 0 at $DIR/shifts.rs:+2:34: +2:44
-        _21 = Ne(move _20, const 0_u128); // scope 0 at $DIR/shifts.rs:+2:34: +2:44
-        assert(!move _21, "attempt to shift right by `{}`, which would overflow", _19) -> [success: bb3, unwind: bb7]; // scope 0 at $DIR/shifts.rs:+2:34: +2:44
+        _18 = Lt(_17, const 8_u128);     // scope 0 at $DIR/shifts.rs:+2:34: +2:44
+        assert(move _18, "attempt to shift right by `{}`, which would overflow", _17) -> [success: bb3, unwind: bb7]; // scope 0 at $DIR/shifts.rs:+2:34: +2:44
```
2023-03-23 08:35:35 +01:00
Scott McMurray
64cce5fc7d Add CastKind::Transmute to MIR
Updates `interpret`, `codegen_ssa`, and `codegen_cranelift` to consume the new cast instead of the intrinsic.

Includes `CastTransmute` for custom MIR building, to be able to test the extra UB.
2023-03-22 15:15:41 -07:00
Matthias Krüger
2ee07a19b7
Rollup merge of #109378 - MU001999:master, r=scottmcm
Remove Ty::is_region_ptr

Fixes #109372
2023-03-22 22:44:42 +01:00
Scott McMurray
b537e6bc53 Generate simpler MIR for shifts 2023-03-22 13:32:12 -07:00
Vadim Petrochenkov
67a2c5bec8 rustc: Remove unused Session argument from some attribute functions 2023-03-22 13:55:55 +04:00
bors
9bdb4881c7 Auto merge of #109119 - lcnr:trait-system-cleanup, r=compiler-errors
a general type system cleanup

removes the helper functions `traits::fully_solve_X` as they add more complexity then they are worth. It's confusing which of these helpers should be used in which context.

changes the way we deal with overflow to always add depth in `evaluate_predicates_recursively`. It may make sense to actually fully transition to not have `recursion_depth` on obligations but that's probably a bit too much for this PR.

also removes some other small - and imo unnecessary - helpers.

r? types
2023-03-22 05:33:18 +00:00
Michael Goulet
7e6506764b IdentitySubsts::identity_for_item takes Into<DefId> 2023-03-21 15:38:52 +00:00
lcnr
791ce0b7b5 remove some trait solver helpers
they add more complexity then they are worth. It's confusing
which of these helpers should be used in which context.
2023-03-21 09:57:20 +01:00
Andy Wang
f404f33c21
Use builtin_index instead of match
Co-authored-by: Oli Scherer <github35764891676564198441@oli-obk.de>
2023-03-20 16:27:44 +01:00
Andy Wang
8e4e55e524
Support aggregate expressions 2023-03-20 15:25:11 +01:00
Mu42
20dc532085 Remove Ty::is_region_ptr 2023-03-20 15:32:21 +08:00
Joshua Nelson
675c4aa2c1 address review comments 2023-03-18 00:43:37 -05:00
Matthias Krüger
13ff2d42cd
Rollup merge of #108958 - clubby789:unbox-the-hir, r=compiler-errors
Remove box expressions from HIR

After #108516, `#[rustc_box]` is used at HIR->THIR lowering and this is no longer emitted, so it can be removed.

This is based on top of #108471 to help with conflicts, so 43490488ccacd1a822e9c621f5ed6fca99959a0b is the only relevant commit (sorry for all the duplicated pings!)

````@rustbot```` label +S-blocked
2023-03-17 08:42:37 +01:00
bors
511364e787 Auto merge of #108944 - cjgillot:clear-local-info, r=oli-obk
Wrap the whole LocalInfo in ClearCrossCrate.

MIR contains a lot of information about locals. The primary purpose of this information is the quality of borrowck diagnostics.

This PR aims to drop this information after MIR analyses are finished, ie. starting from post-cleanup runtime MIR.
2023-03-16 19:59:56 +00:00
bors
c90eb4825a Auto merge of #108282 - cjgillot:mir-checked-sh, r=tmiasko
Implement checked Shl/Shr at MIR building.

This does not require any special handling by codegen backends,
as the overflow behaviour is entirely determined by the rhs (shift amount).

This allows MIR ConstProp to remove the overflow check for constant shifts.

~There is an existing different behaviour between cg_llvm and cg_clif (cc `@bjorn3).`
I took cg_llvm's one as reference: overflow if `rhs < 0 || rhs > number_of_bits_in_lhs_ty`.~

EDIT: `cg_llvm` and `cg_clif` implement the overflow check differently. This PR uses `cg_llvm`'s implementation based on a `BitAnd` instead of `cg_clif`'s one based on an unsigned comparison.
2023-03-15 21:31:06 +00:00
Camille GILLOT
d31386a52b Make is_block_tail a variant of LocalInfo. 2023-03-14 20:52:42 +01:00
Camille GILLOT
bcb161def7 Wrap the whole LocalInfo in ClearCrossCrate. 2023-03-14 20:52:42 +01:00
clubby789
9afffc5b61 Remove box expressions from HIR 2023-03-14 17:18:26 +00:00
bors
f41927f309 Auto merge of #108820 - cjgillot:ensure-on-disk, r=oli-obk
Ensure value is on the on-disk cache before returning from `ensure()`.

The current logic for `ensure()` a query just checks that the node is green in the dependency graph.
However, a lot of places use `ensure()` to prevent the query from being called later. This is the case before stealing a query result.

If the query is actually green but the value is not available in the on-disk cache, `ensure` would return, but a subsequent call to the full query would run the code, and attempt to read from a stolen value.

This PR conforms the query system to the usage by checking whether the queried value is loadable from disk before returning.

Sadly, I can't manage to craft a proper test...

Should fix all instances of "attempted to read from stolen value".
2023-03-12 14:00:28 +00:00
Matthias Krüger
9668ae5eb8
Rollup merge of #108726 - est31:backticks_matchmaking_tidy, r=Nilstrieb
tidy: enforce comment blocks to have an even number of backticks

After PR #108694, most unmatched backticks in `compiler/` comments have been eliminated. This PR adds a tidy lint to ensure no new unmatched backticks are added, and either addresses the lint in the remaining instances it found, or allows it.

Very often, backtick containing sections wrap around lines, for example:

```Rust
// This function takes a tuple `(Vec<String>,
// Box<[u8]>)` and transforms it into `Vec<u8>`.
```

The lint is implemented to work on top of blocks, counting each line with a `//` into a block, and counting if there are an odd or even number of backticks in the entire block, instead of looking at just a single line.
2023-03-12 08:13:25 +01:00
Camille GILLOT
382cc909d5 Make the check for cache opt-in. 2023-03-11 22:41:01 +00:00
Camille GILLOT
facf1e017d Use ensure for thir_abstract_const. 2023-03-11 22:41:01 +00:00
est31
7e2ecb3cd8 Simplify message paths
This makes it easier to open the messages file while developing on features.

The commit was the result of automatted changes:

for p in compiler/rustc_*; do mv $p/locales/en-US.ftl $p/messages.ftl; rmdir $p/locales; done

for p in compiler/rustc_*; do sed -i "s#\.\./locales/en-US.ftl#../messages.ftl#" $p/src/lib.rs; done
2023-03-11 22:51:57 +01:00
est31
7f4cc178f0 Address the new odd backticks tidy lint in compiler/ 2023-03-11 20:40:18 +01:00
Matthias Krüger
5e449b32b5
Rollup merge of #108902 - lcnr:do-while-sus, r=davidtwco,Nilstrieb
no more do while :<
2023-03-10 21:15:46 +01:00
Camille GILLOT
4462bb54e3 Introduce a no-op PlaceMention statement for let _ =. 2023-03-09 17:45:13 +00:00
lcnr
a5258d1721 no more do while 2023-03-09 12:53:03 +01:00
Matthias Krüger
4e84fbf8a0
Rollup merge of #108856 - Zeegomo:remove-drop-and-rep, r=tmiasko
Remove DropAndReplace terminator

#107844 made DropAndReplace unused, let's remove it completely from the codebase.
2023-03-08 21:26:51 +01:00
Yuki Okushi
fddd861a7d
Rollup merge of #108855 - cbeuw:mir-cast, r=tmiasko
Custom MIR: Support `as` casts

Small changes to support this low hanging fruit

r? `@oli-obk` or `@tmiasko` or `@JakobDegen`
2023-03-07 23:06:25 +09:00
Giacomo Pasini
c5d4e4d907
Remove DropAndReplace terminator
PR 107844 made DropAndReplace unused, let's remove it completely
from the codebase.
2023-03-07 14:25:22 +01:00
Andy Wang
7281cd0c21
Custom MIR: Support as casts 2023-03-07 11:42:34 +01:00
bors
0d439f8181 Auto merge of #108351 - petrochenkov:rmdit, r=cjgillot
rustc_middle: Remove trait `DefIdTree`

This trait was a way to generalize over both `TyCtxt` and `Resolver`, but now `Resolver` has access to `TyCtxt`, so this trait is no longer necessary.
2023-03-05 10:37:02 +00:00
bors
14c54b637b Auto merge of #107844 - Zeegomo:no-drop-and-rep, r=cjgillot
Desugaring of drop and replace at MIR build

This commit desugars the drop and replace deriving from an
assignment at MIR build, avoiding the construction of the
`DropAndReplace` terminator (which will be removed in a following PR).

In order to retain the same error messages for replaces a new
`DesugaringKind::Replace` variant is introduced.

The changes in the borrowck are also useful for future work in moving drop elaboration
before borrowck, as no `DropAndReplace` would be present there anymore.

Notes on test diffs:
*  `tests/ui/borrowck/issue-58776-borrowck-scans-children`: the assignment deriving from the desugaring kills the borrow.
*  `tests/ui/async-await/async-fn-size-uninit-locals.rs`, `tests/mir-opt/issue_41110.test.ElaborateDrops.after.mir`,  `tests/mir-opt/issue_41888.main.ElaborateDrops.after.mir`:  drop elaboration generates (or reads from) a useless drop flag due to an issue with the dataflow analysis. Will be fixed independently by https://github.com/rust-lang/rust/pull/106430.

See https://github.com/rust-lang/rust/pull/104488 for more context
2023-03-05 07:56:26 +00:00
bors
b1719530f4 Auto merge of #108692 - nnethercote:dont-call-temporary_scope-twice, r=cjgillot
Don't call `temporary_scope` twice.

`mirror_expr_inner` calls `temporary_scope`. It then calls `make_mirror_unadjusted` which makes an identical call to `temporary_scope`.

This commit changes the `mirror_expr_inner` to get the `temp_lifetime` out of the expression produced by `make_mirror_unadjusted`, similar to how it currently gets the type.

r? `@cjgillot`
2023-03-04 15:10:04 +00:00
Giacomo Pasini
b3a47d9b6b
Desugars drop and replace at MIR build
This commit desugars the drop and replace deriving from an
assignment at MIR build, avoiding the construction of the
DropAndReplace terminator (which will be removed in a followign PR)

In order to retain the same error messages for replaces a new
DesugaringKind::Replace variant is introduced.
2023-03-03 16:33:11 +01:00
est31
ef658907a5 Match end user facing unmatched backticks in compiler/ 2023-03-03 08:39:36 +01:00
Nicholas Nethercote
6b9c4125a5 Don't call temporary_scope twice.
`mirror_expr_inner` calls `temporary_scope`. It then calls
`make_mirror_unadjusted` which makes an identical call to
`temporary_scope`.

This commit changes the `mirror_expr_inner` to get the `temp_lifetime`
out of the expression produced by `make_mirror_unadjusted`, similar to
how it currently gets the type.
2023-03-03 16:15:23 +11:00
Vadim Petrochenkov
c83553da31 rustc_middle: Remove trait DefIdTree
This trait was a way to generalize over both `TyCtxt` and `Resolver`, but now `Resolver` has access to `TyCtxt`, so this trait is no longer necessary.
2023-03-02 23:46:44 +04:00
Matthias Krüger
c9c9283c6a
Rollup merge of #108516 - clubby789:rustc-box-restrict, r=compiler-errors
Restrict `#[rustc_box]` to `Box::new` calls

Currently, `#[rustc_box]` can be applied to any call expression with a single argument. This PR only allows it to be applied to calls to `Box::new`
2023-03-02 07:24:00 +01:00
clubby789
d845769557 Restrict #[rustc_box] to Box::new calls 2023-03-02 02:42:19 +00:00
Matthias Krüger
78f9bb11fe
Rollup merge of #108550 - clubby789:remove-disjoint, r=compiler-errors
Remove the `capture_disjoint_fields` feature

As best I can tell, this was stabilized for Edition 2021 in #88126 but the feature was never removed.
2023-03-01 01:20:24 +01:00
clubby789
f83ce99c32 Remove the capture_disjoint_fields feature 2023-02-28 01:21:15 +00:00
bors
6290ae92b2 Auto merge of #108487 - cjgillot:no-typeck-mir, r=oli-obk
Avoid invoking typeck from borrowck

This PR attempts to reduce direct dependencies between typeck and MIR-related queries. The goal is to have all the information transit either through THIR or through dedicated queries that avoid depending on the whole `TypeckResults`.

In a first commit, we store the type information that MIR building requires into THIR. This avoids edges between mir_built and typeck.

In the second and third commit, we wrap informations around closures (upvars, kind origin and user-provided signature) to avoid borrowck depending on typeck information.

There should be a single remaining borrowck -> typeck edge in the good path, due to inline consts.
2023-02-27 21:48:10 +00:00
Camille GILLOT
dd582bd7db Implement checked Shl/Shr at MIR building. 2023-02-27 19:25:16 +00:00
bors
f540a25745 Auto merge of #108493 - cjgillot:thir-print, r=compiler-errors
Move THIR printing to rustc_mir_build.

https://github.com/rust-lang/rust/pull/107451 increased the compilation time of `rustc_middle` by 10% = 3s.

As https://github.com/rust-lang/rust/pull/107006 adds quite a lot of code to rustc_middle, I suspect it to be the cause.

This PR moves the THIR printing code to `rustc_mir_build`, where the query provider lives, in order to benefit from higher parallelism when compiling rustc.
2023-02-27 15:07:47 +00:00
Camille GILLOT
380ca0c9e6 Move THIR printing to rustc_mir_build. 2023-02-26 14:31:15 +00:00