diff options
Diffstat (limited to 'compiler/rustc_middle/src/mir/coverage.rs')
| -rw-r--r-- | compiler/rustc_middle/src/mir/coverage.rs | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/compiler/rustc_middle/src/mir/coverage.rs b/compiler/rustc_middle/src/mir/coverage.rs index db578854fdc..08d377a8695 100644 --- a/compiler/rustc_middle/src/mir/coverage.rs +++ b/compiler/rustc_middle/src/mir/coverage.rs @@ -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)] |