1 files changed, 69 insertions, 0 deletions
diff --git a/compiler/rustc_codegen_gcc/src/coverageinfo.rs b/compiler/rustc_codegen_gcc/src/coverageinfo.rs
new file mode 100644
index 00000000000..872fc2472e2
--- /dev/null
+++ b/compiler/rustc_codegen_gcc/src/coverageinfo.rs
@@ -0,0 +1,69 @@
+use gccjit::RValue;
+use rustc_codegen_ssa::traits::{CoverageInfoBuilderMethods, CoverageInfoMethods};
+use rustc_hir::def_id::DefId;
+use rustc_middle::mir::coverage::{
+    CodeRegion,
+    CounterValueReference,
+    ExpressionOperandId,
+    InjectedExpressionId,
+    Op,
+};
+use rustc_middle::ty::Instance;
+
+use crate::builder::Builder;
+use crate::context::CodegenCx;
+
+impl<'a, 'gcc, 'tcx> CoverageInfoBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
+    fn set_function_source_hash(
+        &mut self,
+        _instance: Instance<'tcx>,
+        _function_source_hash: u64,
+    ) -> bool {
+        unimplemented!();
+    }
+
+    fn add_coverage_counter(&mut self, _instance: Instance<'tcx>, _id: CounterValueReference, _region: CodeRegion) -> bool {
+        // TODO(antoyo)
+        false
+    }
+
+    fn add_coverage_counter_expression(&mut self, _instance: Instance<'tcx>, _id: InjectedExpressionId, _lhs: ExpressionOperandId, _op: Op, _rhs: ExpressionOperandId, _region: Option<CodeRegion>) -> bool {
+        // TODO(antoyo)
+        false
+    }
+
+    fn add_coverage_unreachable(&mut self, _instance: Instance<'tcx>, _region: CodeRegion) -> bool {
+        // TODO(antoyo)
+        false
+    }
+}
+
+impl<'gcc, 'tcx> CoverageInfoMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
+    fn coverageinfo_finalize(&self) {
+        // TODO(antoyo)
+    }
+
+    fn get_pgo_func_name_var(&self, _instance: Instance<'tcx>) -> RValue<'gcc> {
+        unimplemented!();
+    }
+
+    /// Functions with MIR-based coverage are normally codegenned _only_ if
+    /// called. LLVM coverage tools typically expect every function to be
+    /// defined (even if unused), with at least one call to LLVM intrinsic
+    /// `instrprof.increment`.
+    ///
+    /// Codegen a small function that will never be called, with one counter
+    /// that will never be incremented.
+    ///
+    /// For used/called functions, the coverageinfo was already added to the
+    /// `function_coverage_map` (keyed by function `Instance`) during codegen.
+    /// But in this case, since the unused function was _not_ previously
+    /// codegenned, collect the coverage `CodeRegion`s from the MIR and add
+    /// them. The first `CodeRegion` is used to add a single counter, with the
+    /// same counter ID used in the injected `instrprof.increment` intrinsic
+    /// call. Since the function is never called, all other `CodeRegion`s can be
+    /// added as `unreachable_region`s.
+    fn define_unused_fn(&self, _def_id: DefId) {
+        unimplemented!();
+    }
+}