coverage: Remove unhelpful code for handling multiple files per function

Functions currently can't have mappings in multiple files, and if that ever
changes (e.g. to properly support expansion regions), this code will need to be
completely overhauled anyway.

2 files changed, 7 insertions, 8 deletions

diff --git a/compiler/rustc_middle/src/mir/coverage.rs b/compiler/rustc_middle/src/mir/coverage.rs
index 4a876dc1228..11a4e7f89a7 100644
--- a/compiler/rustc_middle/src/mir/coverage.rs
+++ b/compiler/rustc_middle/src/mir/coverage.rs
@@ -4,7 +4,7 @@ use std::fmt::{self, Debug, Formatter};
 
 use rustc_index::IndexVec;
 use rustc_macros::{HashStable, TyDecodable, TyEncodable, TypeFoldable, TypeVisitable};
-use rustc_span::{Span, Symbol};
+use rustc_span::Span;
 
 rustc_index::newtype_index! {
     /// Used by [`CoverageKind::BlockMarker`] to mark blocks during THIR-to-MIR
@@ -158,7 +158,6 @@ impl Debug for CoverageKind {
 #[derive(Clone, TyEncodable, TyDecodable, Hash, HashStable, PartialEq, Eq, PartialOrd, Ord)]
 #[derive(TypeFoldable, TypeVisitable)]
 pub struct SourceRegion {
-    pub file_name: Symbol,
     pub start_line: u32,
     pub start_col: u32,
     pub end_line: u32,
@@ -167,11 +166,8 @@ pub struct SourceRegion {
 
 impl Debug for SourceRegion {
     fn fmt(&self, fmt: &mut Formatter<'_>) -> fmt::Result {
-        write!(
-            fmt,
-            "{}:{}:{} - {}:{}",
-            self.file_name, self.start_line, self.start_col, self.end_line, self.end_col
-        )
+        let &Self { start_line, start_col, end_line, end_col } = self;
+        write!(fmt, "{start_line}:{start_col} - {end_line}:{end_col}")
     }
 }
 
@@ -246,6 +242,7 @@ pub struct Mapping {
 #[derive(TyEncodable, TyDecodable, Hash, HashStable, TypeFoldable, TypeVisitable)]
 pub struct FunctionCoverageInfo {
     pub function_source_hash: u64,
+    pub body_span: Span,
     pub num_counters: usize,
     pub mcdc_bitmap_bits: usize,
     pub expressions: IndexVec<ExpressionId, Expression>,
diff --git a/compiler/rustc_middle/src/mir/pretty.rs b/compiler/rustc_middle/src/mir/pretty.rs
index d0f93c19e44..f0e2b7a376c 100644
--- a/compiler/rustc_middle/src/mir/pretty.rs
+++ b/compiler/rustc_middle/src/mir/pretty.rs
@@ -596,8 +596,10 @@ fn write_function_coverage_info(
     function_coverage_info: &coverage::FunctionCoverageInfo,
     w: &mut dyn io::Write,
 ) -> io::Result<()> {
-    let coverage::FunctionCoverageInfo { expressions, mappings, .. } = function_coverage_info;
+    let coverage::FunctionCoverageInfo { body_span, expressions, mappings, .. } =
+        function_coverage_info;
 
+    writeln!(w, "{INDENT}coverage body span: {body_span:?}")?;
     for (id, expression) in expressions.iter_enumerated() {
         writeln!(w, "{INDENT}coverage {id:?} => {expression:?};")?;
     }