mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-22 14:55:26 +00:00
a9d17627d2
Lint against getting pointers from immediately dropped temporaries Fixes #123613 ## Changes: 1. New lint: `dangling_pointers_from_temporaries`. Is a generalization of `temporary_cstring_as_ptr` for more types and more ways to get a temporary. 2. `temporary_cstring_as_ptr` is removed and marked as renamed to `dangling_pointers_from_temporaries`. 3. `clippy::temporary_cstring_as_ptr` is marked as renamed to `dangling_pointers_from_temporaries`. 4. Fixed a false positive[^fp] for when the pointer is not actually dangling because of lifetime extension for function/method call arguments. 5. `core::cell::Cell` is now `rustc_diagnostic_item = "Cell"` ## Questions: - [ ] Instead of manually checking for a list of known methods and diagnostic items, maybe add some sort of annotation to those methods in library and check for the presence of that annotation? https://github.com/rust-lang/rust/pull/128985#issuecomment-2318714312 ## Known limitations: ### False negatives[^fn]: See the comments in `compiler/rustc_lint/src/dangling.rs` 1. Method calls that are not checked for: - `temporary_unsafe_cell.get()` - `temporary_sync_unsafe_cell.get()` 2. Ways to get a temporary that are not recognized: - `owning_temporary.field` - `owning_temporary[index]` 3. No checks for ref-to-ptr conversions: - `&raw [mut] temporary` - `&temporary as *(const|mut) _` - `ptr::from_ref(&temporary)` and friends [^fn]: lint **should** be emitted, but **is not** [^fp]: lint **should not** be emitted, but **is** |
||
|---|---|---|
| .. | ||
| assembly | ||
| auxiliary | ||
| codegen | ||
| codegen-units | ||
| coverage | ||
| coverage-run-rustdoc | ||
| crashes | ||
| debuginfo | ||
| incremental | ||
| mir-opt | ||
| pretty | ||
| run-make | ||
| rustdoc | ||
| rustdoc-gui | ||
| rustdoc-js | ||
| rustdoc-js-std | ||
| rustdoc-json | ||
| rustdoc-ui | ||
| ui | ||
| ui-fulldeps | ||
| COMPILER_TESTS.md | ||