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coverage: Explicitly note that counter/expression IDs are function-local

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Zalathar
2023-10-18 12:44:47 +11:00
parent 753caf292c
commit 33da0978ac
2 changed files with 17 additions and 0 deletions
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10
compiler/rustc_middle/src/mir/coverage.rs
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@@ -9,6 +9,11 @@ use std::fmt::{self, Debug, Formatter};
rustc_index::newtype_index! {
/// ID of a coverage counter. Values ascend from 0.
///
/// Before MIR inlining, counter IDs are local to their enclosing function.
/// After MIR inlining, coverage statements may have been inlined into
/// another function, so use the statement's source-scope to find which
/// function/instance its IDs are meaningful for.
///
/// Note that LLVM handles counter IDs as `uint32_t`, so there is no need
/// to use a larger representation on the Rust side.
#[derive(HashStable)]
@@ -24,6 +29,11 @@ impl CounterId {
rustc_index::newtype_index! {
/// ID of a coverage-counter expression. Values ascend from 0.
///
/// Before MIR inlining, expression IDs are local to their enclosing function.
/// After MIR inlining, coverage statements may have been inlined into
/// another function, so use the statement's source-scope to find which
/// function/instance its IDs are meaningful for.
///
/// Note that LLVM handles expression IDs as `uint32_t`, so there is no need
/// to use a larger representation on the Rust side.
#[derive(HashStable)]