coverage: Detach #[coverage(..)] from codegen attribute handling

Author: Zalathar

compiler/rustc_codegen_ssa/src/codegen_attrs.rs

@@ -124,22 +124,6 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: LocalDefId) -> CodegenFnAttrs {
                         .emit();
                 }
             }
-            sym::coverage => {
-                let inner = attr.meta_item_list();
-                match inner.as_deref() {
-                    Some([item]) if item.has_name(sym::off) => {
-                        codegen_fn_attrs.flags |= CodegenFnAttrFlags::NO_COVERAGE;
-                    }
-                    Some([item]) if item.has_name(sym::on) => {
-                        // Allow #[coverage(on)] for being explicit, maybe also in future to enable
-                        // coverage on a smaller scope within an excluded larger scope.
-                    }
-                    Some(_) | None => {
-                        tcx.dcx()
-                            .span_delayed_bug(attr.span, "unexpected value of coverage attribute");
-                    }
-                }
-            }
             sym::rustc_std_internal_symbol => {
                 codegen_fn_attrs.flags |= CodegenFnAttrFlags::RUSTC_STD_INTERNAL_SYMBOL
             }
@@ -584,7 +568,6 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: LocalDefId) -> CodegenFnAttrs {
     }
 
     if codegen_fn_attrs.flags.contains(CodegenFnAttrFlags::NAKED) {
-        codegen_fn_attrs.flags |= CodegenFnAttrFlags::NO_COVERAGE;
         codegen_fn_attrs.inline = InlineAttr::Never;
     }
 

compiler/rustc_middle/src/middle/codegen_fn_attrs.rs

@@ -87,10 +87,7 @@ bitflags::bitflags! {
         /// #[cmse_nonsecure_entry]: with a TrustZone-M extension, declare a
         /// function as an entry function from Non-Secure code.
         const CMSE_NONSECURE_ENTRY      = 1 << 13;
-        /// `#[coverage(off)]`: indicates that the function should be ignored by
-        /// the MIR `InstrumentCoverage` pass and not added to the coverage map
-        /// during codegen.
-        const NO_COVERAGE               = 1 << 14;
+        // (Bit 14 was used for `#[coverage(off)]`, but is now unused.)
         /// `#[used(linker)]`:
         /// indicates that neither LLVM nor the linker will eliminate this function.
         const USED_LINKER               = 1 << 15;

compiler/rustc_middle/src/query/mod.rs

@@ -572,6 +572,14 @@ rustc_queries! {
         separate_provide_extern
     }
 
+    /// Checks for `#[coverage(off)]` or `#[coverage(on)]`.
+    ///
+    /// Returns `false` if `#[coverage(off)]` was found, or `true` if
+    /// either `#[coverage(on)]` or no coverage attribute was found.
+    query coverage_attr_on(key: LocalDefId) -> bool {
+        desc { |tcx| "checking for `#[coverage(..)]` on `{}`", tcx.def_path_str(key) }
+    }
+
     /// Summarizes coverage IDs inserted by the `InstrumentCoverage` MIR pass
     /// (for compiler option `-Cinstrument-coverage`), after MIR optimizations
     /// have had a chance to potentially remove some of them.

compiler/rustc_mir_transform/src/coverage/query.rs

@@ -6,11 +6,13 @@ use rustc_middle::query::TyCtxtAt;
 use rustc_middle::ty::{self, TyCtxt};
 use rustc_middle::util::Providers;
 use rustc_span::def_id::LocalDefId;
+use rustc_span::sym;
 
 /// Registers query/hook implementations related to coverage.
 pub(crate) fn provide(providers: &mut Providers) {
     providers.hooks.is_eligible_for_coverage =
         |TyCtxtAt { tcx, .. }, def_id| is_eligible_for_coverage(tcx, def_id);
+    providers.queries.coverage_attr_on = coverage_attr_on;
     providers.queries.coverage_ids_info = coverage_ids_info;
 }
 
@@ -38,14 +40,37 @@ fn is_eligible_for_coverage(tcx: TyCtxt<'_>, def_id: LocalDefId) -> bool {
         return false;
     }
 
-    if tcx.codegen_fn_attrs(def_id).flags.contains(CodegenFnAttrFlags::NO_COVERAGE) {
+    if tcx.codegen_fn_attrs(def_id).flags.contains(CodegenFnAttrFlags::NAKED) {
+        trace!("InstrumentCoverage skipped for {def_id:?} (`#[naked]`)");
+        return false;
+    }
+
+    if !tcx.coverage_attr_on(def_id) {
         trace!("InstrumentCoverage skipped for {def_id:?} (`#[coverage(off)]`)");
         return false;
     }
 
     true
 }
 
+/// Query implementation for `coverage_attr_on`.
+fn coverage_attr_on(tcx: TyCtxt<'_>, def_id: LocalDefId) -> bool {
+    if let Some(attr) = tcx.get_attr(def_id, sym::coverage) {
+        match attr.meta_item_list().as_deref() {
+            Some([item]) if item.has_name(sym::off) => return false,
+            Some([item]) if item.has_name(sym::on) => return true,
+            Some(_) | None => {
+                // Other possibilities should have been rejected by `rustc_parse::validate_attr`.
+                tcx.dcx().span_bug(attr.span, "unexpected value of coverage attribute");
+            }
+        }
+    }
+
+    // We didn't see an explicit coverage attribute, so
+    // allow coverage instrumentation by default.
+    true
+}
+
 /// Query implementation for `coverage_ids_info`.
 fn coverage_ids_info<'tcx>(
     tcx: TyCtxt<'tcx>,