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Remove confusing use_polonius
flag and do less cloning
#126023
Conversation
The `use_polonius` flag is both redundant and confusing since every function it's propagated to also checks if `all_facts` is `Some`, the true test of whether to generate Polonius facts for Polonius or for external consumers. This PR makes that path clearer by simply doing away with the argument and handling the logic in precisely two places: where facts are populated (check for `Some`), and where `all_facts` are initialised. It also delays some statements until after that check to avoid the miniscule performance penalty of executing them when Polonius is disabled. This also addresses @lqd's concern in rust-lang#125652 by reducing the size of what is cloned out of Polonius facts to just the facts being added, as opposed to the entire vector of potential inputs, and added descriptive comments. *Reviewer note*: the comments in [add_extra_drop_facts](https://github.com/rust-lang/rust/blob/85f90a461262f7ca37a6e629933d455fa9c3ee48/compiler/rustc_borrowck/src/type_check/liveness/trace.rs#L219) should be inspected by a reviewer, in particular the one on L#259 in this PR, which should be trivial for someone with the right background knowledge. I also included some minor lints I found on the way there that I couldn't help myself from addressing.
I'm going to reroll because I'm not familiar with this part of the compiler. r? compiler |
Ping @nikomatsakis ready for review if you have the time (this is not super important, but you asked me to ping you without a scope so I am) |
Sorry, was gonna review this but I got hella distracted. If Niko can review it, great, otherwise you can bounce it back to me and bother me until I review it. r? nikomatsakis |
@bors r |
☀️ Test successful - checks-actions |
Finished benchmarking commit (d49994b): comparison URL. Overall result: ❌ regressions - no action needed@rustbot label: -perf-regression Instruction countThis is a highly reliable metric that was used to determine the overall result at the top of this comment.
Max RSS (memory usage)This benchmark run did not return any relevant results for this metric. CyclesResults (secondary 8.0%)This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
Binary sizeResults (secondary -0.0%)This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
Bootstrap: 692.369s -> 693.26s (0.13%) |
Update Rust toolchain from nightly-2024-06-24 to nightly-2024-06-25 without any other source changes. This is an automatically generated pull request. If any of the CI checks fail, manual intervention is required. In such a case, review the changes at https://github.com/rust-lang/rust from rust-lang@bcf94de up to rust-lang@6b0f4b5. The log for this commit range is: rust-lang@6b0f4b5ec3 Auto merge of rust-lang#126914 - compiler-errors:rollup-zx0hchm, r=compiler-errors rust-lang@16bd6e25e1 Rollup merge of rust-lang#126911 - oli-obk:do_not_count_errors, r=compiler-errors rust-lang@59c258f51f Rollup merge of rust-lang#126909 - onur-ozkan:add-kobzol, r=matthiaskrgr rust-lang@85eb835a14 Rollup merge of rust-lang#126904 - GrigorenkoPV:nonzero-fixme, r=joboet rust-lang@a7721a0373 Rollup merge of rust-lang#126899 - GrigorenkoPV:suggest-const-block, r=davidtwco rust-lang@9ce2a070b3 Rollup merge of rust-lang#126682 - Zalathar:coverage-attr, r=lcnr rust-lang@49bdf460a2 Rollup merge of rust-lang#126673 - oli-obk:dont_rely_on_err_reporting, r=compiler-errors rust-lang@46e43984d1 Rollup merge of rust-lang#126413 - matthiaskrgr:crshmsg, r=oli-obk rust-lang@ed460d2eaa Rollup merge of rust-lang#125575 - dingxiangfei2009:derive-smart-ptr, r=davidtwco rust-lang@c77dc28f87 Rollup merge of rust-lang#125082 - kpreid:const-uninit, r=dtolnay rust-lang@faa28be2f1 Rollup merge of rust-lang#124712 - Enselic:deprecate-inline-threshold, r=pnkfelix rust-lang@00e5f5886a Rollup merge of rust-lang#124460 - long-long-float:show-notice-about-enum-with-debug, r=pnkfelix rust-lang@d8d5732456 Auto merge of rust-lang#126784 - scottmcm:smaller-terminator, r=compiler-errors rust-lang@13fca73f49 Replace `MaybeUninit::uninit_array()` with array repeat expression. rust-lang@5a3e2a4e92 Auto merge of rust-lang#126523 - joboet:the_great_big_tls_refactor, r=Mark-Simulacrum rust-lang@45261ff2ec add @Kobzol to bootstrap team for triagebot rust-lang@84474a25a4 Small fixme in core now that NonZero is generic rust-lang@50a02ed789 std: fix wasm builds rust-lang@8fc6b3de19 Separate the mir body lifetime from the other lifetimes rust-lang@1c4d0ced58 Separate the lifetimes of the `BorrowckInferCtxt` from the other borrowed items rust-lang@d371d17496 Auto merge of rust-lang#126900 - matthiaskrgr:rollup-24ah97b, r=matthiaskrgr rust-lang@8ffb5f936a compiletest: make the crash test error message abit more informative rust-lang@a80ee9159b Rollup merge of rust-lang#126882 - estebank:multiline-order, r=WaffleLapkin rust-lang@8bfde609e2 Rollup merge of rust-lang#126414 - ChrisDenton:target-known, r=Nilstrieb rust-lang@94b9ea417d Rollup merge of rust-lang#126213 - zachs18:atomicbool-u8-i8-from-ptr-alignment, r=Nilstrieb rust-lang@9d24ecc37b Rollup merge of rust-lang#125241 - Veykril:tool-rust-analyzer, r=davidtwco rust-lang@ba5ec1fc5c Suggest inline const blocks for array initialization rust-lang@06c072f158 Auto merge of rust-lang#126788 - GuillaumeGomez:migrate-rustdoc-tests-syntax, r=fmease,oli-obk rust-lang@1852141219 coverage: Bless coverage attribute tests rust-lang@b7c057c9b2 coverage: Always error on `#[coverage(..)]` in unexpected places rust-lang@a000fa8b54 coverage: Tighten validation of `#[coverage(off)]` and `#[coverage(on)]` rust-lang@b5dfeba0e1 coverage: Forbid multiple `#[coverage(..)]` attributes rust-lang@6909feab8e Allow numbers in rustdoc tests commands rust-lang@4e258bb4c3 Fix tidy issue for rustdoc tests commands rust-lang@51fedf65ff Remove commands duplication between `compiletest` and `tests/rustdoc` rust-lang@1b67035579 Update `tests/rustdoc` to new test syntax rust-lang@d3ec92e16e Move `tests/rustdoc` testsuite to `//@` syntax rust-lang@2c243d9570 Auto merge of rust-lang#126891 - matthiaskrgr:rollup-p6dl1gk, r=matthiaskrgr rust-lang@b94d2754b5 Rollup merge of rust-lang#126888 - compiler-errors:oops-debug-printing, r=dtolnay rust-lang@9892b3e9fe Rollup merge of rust-lang#126854 - devnexen:std_unix_os_fallback_upd, r=Mark-Simulacrum rust-lang@3108dfaced Rollup merge of rust-lang#126849 - workingjubilee:correctly-classify-arm-low-dregs, r=Amanieu rust-lang@dcace866f0 Rollup merge of rust-lang#126845 - rust-lang:cargo_update, r=Mark-Simulacrum rust-lang@21850f5bd8 Rollup merge of rust-lang#126807 - devnexen:copy_file_macos_simpl, r=Mark-Simulacrum rust-lang@b24e3df0df Rollup merge of rust-lang#126754 - compiler-errors:use-rustfmt, r=calebcartwright rust-lang@ad0531ae0d Rollup merge of rust-lang#126455 - surechen:fix_126222, r=estebank rust-lang@7babf99ea9 Rollup merge of rust-lang#126298 - heiher:loongarch64-musl-ci, r=Mark-Simulacrum rust-lang@9a591ea1ce Rollup merge of rust-lang#126177 - carbotaniuman:unsafe_attr_errors, r=jieyouxu rust-lang@25446c25fc Remove stray println from rustfmt rust-lang@d49994b060 Auto merge of rust-lang#126023 - amandasystems:you-dropped-this-again, r=nikomatsakis rust-lang@a23917cfd0 Add hard error and migration lint for unsafe attrs rust-lang@284437d434 Special case when a code line only has multiline span starts rust-lang@f1be59fa72 SmartPointer derive-macro rust-lang@a426d6fdf0 Implement use<> formatting in rustfmt rust-lang@16fef40896 Promote loongarch64-unknown-linux-musl to Tier 2 with host tools rust-lang@03d73fa6ba ci: Add support for dist-loongarch64-musl rust-lang@fc50acae90 fix build rust-lang@bd9ce3e074 std::unix::os::home_dir: fallback's optimisation. rust-lang@0d8f734172 compiler: Fix arm32 asm issues by hierarchically sorting reg classes rust-lang@e8b5ba1111 For [E0308]: mismatched types, when expr is in an arm's body, not add semicolon ';' at the end of it. rust-lang@990535723d cargo update rust-lang@b28efb11af Save 2 pointers in `TerminatorKind` (96 → 80 bytes) rust-lang@65530ba100 std::unix::fs: copy simplification for apple. rust-lang@339015920d Add `rust_analyzer` as a predefined tool rust-lang@3f2f8438b4 Ensure we don't accidentally succeed when we want to report an error rust-lang@32f9b8bf76 std: rename module for clarity rust-lang@35f050b8da std: update TLS module documentation rust-lang@b2f29edc81 std: use the `c_int` from `core::ffi` instead of `libc` rust-lang@d70f071392 std: simplify `#[cfg]`s for TLS rust-lang@d630f5da7a Show notice about "never used" for enum rust-lang@f3facf1175 std: refactor the TLS implementation rust-lang@f5f067bf9d Deprecate no-op codegen option `-Cinline-threshold=...` rust-lang@651ff643ae Fix typo in `-Cno-stack-check` deprecation warning rust-lang@3af624272a rustc_codegen_ssa: Remove unused ModuleConfig::inline_threshold rust-lang@34e6ea1446 Tier 2 std support must always be known rust-lang@2d4cb7aa5a Update docs for AtomicU8/I8. rust-lang@7885c7b7b2 Update safety docs for AtomicBool::from_ptr. rust-lang@7b5b7a7010 Remove confusing `use_polonius` flag and do less cloning Co-authored-by: tautschnig <1144736 [email protected]>
The
use_polonius
flag is both redundant and confusing since every function it's propagated to also checks ifall_facts
isSome
, the true test of whether to generate Polonius facts for Polonius or for external consumers. This PR makes that path clearer by simply doing away with the argument and handling the logic in precisely two places: where facts are populated (check forSome
), and whereall_facts
are initialised. It also delays some statements until after that check to avoid the miniscule performance penalty of executing them when Polonius is disabled.This also addresses @lqd's concern in #125652 by reducing the size of what is cloned out of Polonius facts to just the facts being added, as opposed to the entire vector of potential inputs, and added descriptive comments.
Reviewer note: the comments in
add_extra_drop_facts
should be inspected by a reviewer, in particular the one on L#259 in this PR, which should be trivial for someone with the right background knowledge to address.I also included some lints I found on the way there that I couldn't help myself from addressing.