diff options
| -rw-r--r-- | compiler/rustc_lint/src/levels.rs | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/compiler/rustc_lint/src/levels.rs b/compiler/rustc_lint/src/levels.rs index eef342d4b07..b5b9312df63 100644 --- a/compiler/rustc_lint/src/levels.rs +++ b/compiler/rustc_lint/src/levels.rs @@ -28,8 +28,12 @@ use crate::errors::{ UnknownToolInScopedLint, }; +/// Collection of lint levels for the whole crate. +/// This is used by AST-based lints, which do not +/// wait until we have built HIR to be emitted. #[derive(Debug)] struct LintLevelSets { + /// Linked list of specifications. list: IndexVec<LintStackIndex, LintSet>, } @@ -40,12 +44,19 @@ rustc_index::newtype_index! { } } +/// Specifications found at this position in the stack. This map only represents the lints +/// found for one set of attributes (like `shallow_lint_levels_on` does). +/// +/// We store the level specifications as a linked list. +/// Each `LintSet` represents a set of attributes on the same AST node. +/// The `parent` forms a linked list that matches the AST tree. +/// This way, walking the linked list is equivalent to walking the AST bottom-up +/// to find the specifications for a given lint. #[derive(Debug)] struct LintSet { // -A,-W,-D flags, a `Symbol` for the flag itself and `Level` for which // flag. specs: FxHashMap<LintId, LevelAndSource>, - parent: LintStackIndex, } |