!! (WIP) CoverageKind::Mappings (unused)

Author: Zalathar

compiler/rustc_codegen_llvm/src/coverageinfo/map_data.rs

@@ -140,7 +140,7 @@ impl<'tcx> FunctionCoverage<'tcx> {
         self.add_mappings(CovTerm::Zero, code_regions);
     }
 
-    fn add_mappings(&mut self, kind: CovTerm, code_regions: &[CodeRegion]) {
+    pub(crate) fn add_mappings(&mut self, kind: CovTerm, code_regions: &[CodeRegion]) {
         // There's no need to sort the regions by filename before grouping here,
         // because the result is the same either way.
         for regions_for_file in code_regions.group_by(|a, b| a.file_name == b.file_name) {

compiler/rustc_codegen_llvm/src/coverageinfo/mod.rs

@@ -141,6 +141,9 @@ impl<'tcx> CoverageInfoBuilderMethods<'tcx> for Builder<'_, '_, 'tcx> {
             CoverageKind::Unreachable => {
                 func_coverage.add_unreachable_regions(code_regions);
             }
+            CoverageKind::Mappings { kind } => {
+                func_coverage.add_mappings(kind, code_regions);
+            }
         }
     }
 }

compiler/rustc_middle/src/mir/coverage.rs

@@ -76,6 +76,9 @@ pub enum CoverageKind {
         rhs: CovTerm,
     },
     Unreachable,
+    Mappings {
+        kind: CovTerm,
+    },
 }
 
 impl Debug for CoverageKind {
@@ -95,6 +98,7 @@ impl Debug for CoverageKind {
                 rhs,
             ),
             Unreachable => write!(fmt, "Unreachable"),
+            Mappings { kind } => fmt.debug_struct("Mappings").field("kind", kind).finish(),
         }
     }
 }

compiler/rustc_mir_transform/src/coverage/query.rs

@@ -69,6 +69,7 @@ impl CoverageVisitor {
                 self.update_from_term(rhs);
             }
             CoverageKind::Unreachable => {}
+            CoverageKind::Mappings { kind } => self.update_from_term(kind),
         }
     }
 }