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coverage: Overhaul validation of the #[coverage(..)] attribute #126682

Merged
merged 4 commits into from
Jun 24, 2024
Merged

coverage: Overhaul validation of the #[coverage(..)] attribute #126682

merged 4 commits into from
Jun 24, 2024

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Zalathar
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@Zalathar Zalathar commented Jun 19, 2024 •
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This PR makes sweeping changes to how the (currently-unstable) coverage attribute is validated:

  • Multiple coverage attributes on the same item/expression are now treated as an error.
  • The attribute must always be #[coverage(off)] or #[coverage(on)], and the error messages for this are more consistent.
    • A trailing comma is still allowed after off/on, since that's part of the normal attribute syntax.
  • Some places that silently ignored a coverage attribute now produce an error instead.
    • These cases were all clearly bugs.
  • Some places that ignored a coverage attribute (with a warning) now produce an error instead.
    • These were originally added as lints, but I don't think it makes much sense to knowingly allow new attributes to be used in meaningless places.
    • Some of these errors might soon disappear, if it's easy to extend recursive coverage attributes to things like modules and impl blocks.

One of the goals of this PR is to lay a more solid foundation for making the coverage attribute recursive, so that it applies to all nested functions/closures instead of just the one it is directly attached to.

Fixes #126658.

This PR incorporates #126659, which adds more tests for validation of the coverage attribute.

@rustbot label +A-code-coverage

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rustbot commented Jun 19, 2024

r? @lcnr

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@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. A-code-coverage Area: Source-based code coverage (-Cinstrument-coverage) labels Jun 19, 2024
@Zalathar Zalathar mentioned this pull request Jun 19, 2024
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lcnr commented Jun 20, 2024

r? compiler

@rustbot rustbot assigned oli-obk and unassigned lcnr Jun 20, 2024
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tests/ui/coverage-attr/word-only.rs Outdated Show resolved Hide resolved
compiler/rustc_parse/src/validate_attr.rs Outdated Show resolved Hide resolved
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lcnr commented Jun 20, 2024

r? @lcnr 😅 sorry for the ping oli

@rustbot rustbot assigned lcnr and unassigned oli-obk Jun 20, 2024
@Zalathar Zalathar force-pushed the coverage-attr branch 2 times, most recently from 435eb30 to 01954ad Compare June 20, 2024 07:17
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Tweaked test comments (diff).

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Switched to checking the off/on syntax in validate_attr (diff).

I think the error messages are a bit worse, but it's better integrated into the existing attribute syntax-checking, so I'm content to leave further improvements for later.

@Zalathar Zalathar force-pushed the coverage-attr branch 2 times, most recently from 9ea27b1 to 1f4c57b Compare June 21, 2024 00:26
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Addressed nit (diff).

(I haven't been able to construct a test that actually requires the is_word check, since #[coverage(off(foo))] seems to be rejected even without it, but I'll err on the side of caution and leave it in.)

@Zalathar
coverage: Forbid multiple #[coverage(..)] attributes
b5dfeba 
It might make sense to allow this in the future, if we add values that aren't
mutually exclusive, but for now having multiple coverage attributes on one item
is useless.
@Zalathar
coverage: Tighten validation of #[coverage(off)] and #[coverage(on)]
a000fa8
@Zalathar
coverage: Always error on #[coverage(..)] in unexpected places
b7c057c 
This upgrades some warnings to errors, and also catches cases where the
attribute was silently ignored.
@Zalathar
coverage: Bless coverage attribute tests
1852141
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Rebased after conflict; no changes.

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lcnr commented Jun 24, 2024

thanks

@bors r+ rollup

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bors commented Jun 24, 2024

📌 Commit 1852141 has been approved by lcnr

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jun 24, 2024
@compiler-errors compiler-errors mentioned this pull request Jun 24, 2024
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bors added a commit to rust-lang-ci/rust that referenced this pull request Jun 24, 2024
@bors
Auto merge of rust-lang#126914 - compiler-errors:rollup-zx0hchm, r=co…
6b0f4b5 
…mpiler-errors

Rollup of 11 pull requests

Successful merges:

 - rust-lang#124460 (Show notice about  "never used" of Debug for enum)
 - rust-lang#124712 (Deprecate no-op codegen option `-Cinline-threshold=...`)
 - rust-lang#125082 (Remove `MaybeUninit::uninit_array()` and replace it with inline const blocks.)
 - rust-lang#125575 (SmartPointer derive-macro)
 - rust-lang#126413 (compiletest: make the crash test error message abit more informative)
 - rust-lang#126673 (Ensure we don't accidentally succeed when we want to report an error)
 - rust-lang#126682 (coverage: Overhaul validation of the `#[coverage(..)]` attribute)
 - rust-lang#126899 (Suggest inline const blocks for array initialization)
 - rust-lang#126904 (Small fixme in core now that NonZero is generic)
 - rust-lang#126909 (add `@kobzol` to bootstrap team for triagebot)
 - rust-lang#126911 (Split the lifetimes of `MirBorrowckCtxt`)

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 9ce2a07 into rust-lang:master Jun 24, 2024
6 checks passed
@rustbot rustbot added this to the 1.81.0 milestone Jun 24, 2024
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Jun 24, 2024
@rust-timer
Unrolled build for rust-lang#126682
aafafa9 
Rollup merge of rust-lang#126682 - Zalathar:coverage-attr, r=lcnr

coverage: Overhaul validation of the `#[coverage(..)]` attribute

This PR makes sweeping changes to how the (currently-unstable) coverage attribute is validated:
- Multiple coverage attributes on the same item/expression are now treated as an error.
- The attribute must always be `#[coverage(off)]` or `#[coverage(on)]`, and the error messages for this are more consistent.
  -  A trailing comma is still allowed after off/on, since that's part of the normal attribute syntax.
- Some places that silently ignored a coverage attribute now produce an error instead.
  - These cases were all clearly bugs.
- Some places that ignored a coverage attribute (with a warning) now produce an error instead.
  - These were originally added as lints, but I don't think it makes much sense to knowingly allow new attributes to be used in meaningless places.
  - Some of these errors might soon disappear, if it's easy to extend recursive coverage attributes to things like modules and impl blocks.

---

One of the goals of this PR is to lay a more solid foundation for making the coverage attribute recursive, so that it applies to all nested functions/closures instead of just the one it is directly attached to.

Fixes rust-lang#126658.

This PR incorporates rust-lang#126659, which adds more tests for validation of the coverage attribute.

`@rustbot` label +A-code-coverage
@Zalathar Zalathar deleted the coverage-attr branch June 25, 2024 01:07
jaisnan pushed a commit to jaisnan/rust-dev that referenced this pull request Jul 29, 2024
@github-actions @tautschnig
Automatic toolchain upgrade to nightly-2024-06-25 (rust-lang#3292)
1491dd6 
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+tautschnig@users.noreply.github.com>
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Inconsistent handling of #[coverage(..)] attributes that are malformed or misplaced
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