fix: #47446

- Add test for issue 47446 - Implement the new lint lint_builtin_mixed_export_name_and_no_mangle - Add suggestion how to fix it

Cargo.lock

@@ -3453,6 +3453,7 @@ dependencies = [
  "rustc_abi",
  "rustc_arena",
  "rustc_ast",
+ "rustc_ast_pretty",
  "rustc_attr",
  "rustc_data_structures",
  "rustc_errors",

compiler/rustc_codegen_ssa/Cargo.toml

@@ -17,6 +17,7 @@ regex = "1.4"
 rustc_abi = { path = "../rustc_abi" }
 rustc_arena = { path = "../rustc_arena" }
 rustc_ast = { path = "../rustc_ast" }
+rustc_ast_pretty = { path = "../rustc_ast_pretty" }
 rustc_attr = { path = "../rustc_attr" }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_errors = { path = "../rustc_errors" }

compiler/rustc_codegen_ssa/messages.ftl

@@ -201,6 +201,11 @@ codegen_ssa_missing_memory_ordering = Atomic intrinsic missing memory ordering
 codegen_ssa_missing_query_depgraph =
  found CGU-reuse attribute but `-Zquery-dep-graph` was not specified
 
+codegen_ssa_mixed_export_name_and_no_mangle = `{$no_mangle_attr}` attribute may not be used in combination with `#[export_name]`
+ .label = `{$no_mangle_attr}` is ignored
+ .note = `#[export_name]` takes precedence
+ .suggestion = remove the `{$no_mangle_attr}` attribute
+
 codegen_ssa_msvc_missing_linker = the msvc targets depend on the msvc linker but `link.exe` was not found
 
 codegen_ssa_multiple_external_func_decl = multiple declarations of external function `{$function}` from library `{$library_name}` have different calling conventions

compiler/rustc_codegen_ssa/src/codegen_attrs.rs

@@ -3,11 +3,10 @@ use rustc_attr::{InlineAttr, InstructionSetAttr, OptimizeAttr, list_contains_nam
 use rustc_data_structures::fx::FxHashMap;
 use rustc_errors::codes::*;
 use rustc_errors::{DiagMessage, SubdiagMessage, struct_span_code_err};
-use rustc_hir as hir;
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{DefId, LOCAL_CRATE, LocalDefId};
 use rustc_hir::weak_lang_items::WEAK_LANG_ITEMS;
-use rustc_hir::{LangItem, lang_items};
+use rustc_hir::{self as hir, HirId, LangItem, lang_items};
 use rustc_middle::middle::codegen_fn_attrs::{
  CodegenFnAttrFlags, CodegenFnAttrs, PatchableFunctionEntry,
 };
@@ -78,6 +77,7 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: LocalDefId) -> CodegenFnAttrs {
  let mut inline_span = None;
  let mut link_ordinal_span = None;
  let mut no_sanitize_span = None;
+ let mut mixed_export_name_no_mangle_lint_state = MixedExportNameAndNoMangleState::default();
 
  for attr in attrs.iter() {
  // In some cases, attribute are only valid on functions, but it's the `check_attr`
@@ -116,7 +116,12 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: LocalDefId) -> CodegenFnAttrs {
  sym::naked => codegen_fn_attrs.flags |= CodegenFnAttrFlags::NAKED,
  sym::no_mangle => {
  if tcx.opt_item_name(did.to_def_id()).is_some() {
- codegen_fn_attrs.flags |= CodegenFnAttrFlags::NO_MANGLE
+ codegen_fn_attrs.flags |= CodegenFnAttrFlags::NO_MANGLE;
+ mixed_export_name_no_mangle_lint_state.track_no_mangle(
+ attr.span,
+ tcx.local_def_id_to_hir_id(did),
+ rustc_ast_pretty::pprust::attribute_to_string(attr),
+ );
  } else {
  tcx.dcx()
  .struct_span_err(
@@ -240,6 +245,7 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: LocalDefId) -> CodegenFnAttrs {
  .emit();
  }
  codegen_fn_attrs.export_name = Some(s);
+ mixed_export_name_no_mangle_lint_state.track_export_name(attr.span);
  }
  }
  sym::target_feature => {
@@ -513,6 +519,8 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: LocalDefId) -> CodegenFnAttrs {
  }
  }
 
+ mixed_export_name_no_mangle_lint_state.lint_if_mixed(tcx);
+
  codegen_fn_attrs.inline = attrs.iter().fold(InlineAttr::None, |ia, attr| {
  if !attr.has_name(sym::inline) {
  return ia;
@@ -779,6 +787,49 @@ fn check_link_name_xor_ordinal(
  }
 }
 
+#[derive(Default)]
+struct MixedExportNameAndNoMangleState {
+ export_name: Option<Span>,
+ hir_id: Option<HirId>,
+ no_mangle: Option<Span>,
+ no_mangle_attr_name: Option<String>,
+}
+
+impl MixedExportNameAndNoMangleState {
+ fn track_export_name(&mut self, span: Span) {
+ self.export_name = Some(span);
+ }
+
+ fn track_no_mangle(&mut self, span: Span, hir_id: HirId, attr_name: String) {
+ self.no_mangle = Some(span);
+ self.hir_id = Some(hir_id);
+ self.no_mangle_attr_name = Some(attr_name);
+ }
+
+ /// Emit diagnostics if the lint condition is met.
+ fn lint_if_mixed(self, tcx: TyCtxt<'_>) {
+ if let Self {
+ export_name: Some(export_name),
+ no_mangle: Some(no_mangle),
+ hir_id: Some(hir_id),
+ no_mangle_attr_name: Some(no_mangle_attr_name),
+ } = self
+ {
+ tcx.emit_node_span_lint(
+ lint::builtin::UNUSED_ATTRIBUTES,
+ hir_id,
+ no_mangle,
+ errors::MixedExportNameAndNoMangle {
+ no_mangle,
+ no_mangle_attr: no_mangle_attr_name,
+ export_name,
+ removal_span: no_mangle,
+ },
+ );
+ }
+ }
+}
+
 pub(crate) fn provide(providers: &mut Providers) {
  *providers = Providers { codegen_fn_attrs, should_inherit_track_caller, ..*providers };
 }

compiler/rustc_codegen_ssa/src/errors.rs

@@ -10,7 +10,7 @@ use rustc_errors::codes::*;
 use rustc_errors::{
  Diag, DiagArgValue, DiagCtxtHandle, Diagnostic, EmissionGuarantee, IntoDiagArg, Level,
 };
-use rustc_macros::{Diagnostic, Subdiagnostic};
+use rustc_macros::{Diagnostic, LintDiagnostic, Subdiagnostic};
 use rustc_middle::ty::Ty;
 use rustc_middle::ty::layout::LayoutError;
 use rustc_span::{Span, Symbol};
@@ -1114,3 +1114,15 @@ impl<G: EmissionGuarantee> Diagnostic<'_, G> for TargetFeatureDisableOrEnable<'_
 #[derive(Diagnostic)]
 #[diag(codegen_ssa_aix_strip_not_used)]
 pub(crate) struct AixStripNotUsed;
+
+#[derive(LintDiagnostic)]
+#[diag(codegen_ssa_mixed_export_name_and_no_mangle)]
+pub(crate) struct MixedExportNameAndNoMangle {
+ #[label]
+ pub no_mangle: Span,
+ pub no_mangle_attr: String,
+ #[note]
+ pub export_name: Span,
+ #[suggestion(style = "verbose", code = "", applicability = "machine-applicable")]
+ pub removal_span: Span,
+}

tests/ui/asm/naked-functions.rs

@@ -219,7 +219,6 @@ pub unsafe extern "C" fn compatible_must_use_attributes() -> u64 {
 
 #[export_name = "exported_function_name"]
 #[link_section = ".custom_section"]
-#[no_mangle]
 #[naked]
 pub unsafe extern "C" fn compatible_ffi_attributes_1() {
  naked_asm!("", options(raw));

tests/ui/attributes/mixed_export_name_and_no_mangle.fixed

@@ -0,0 +1,14 @@
+// issue: rust-lang/rust#47446
+//@ run-rustfix
+//@ check-pass
+
+#![warn(unused_attributes)]
+//~^ WARN `#[no_mangle]` attribute may not be used in combination with `#[export_name]` [unused_attributes]
+#[export_name = "foo"]
+pub fn bar() {}
+
+//~^ WARN `#[unsafe(no_mangle)]` attribute may not be used in combination with `#[export_name]` [unused_attributes]
+#[export_name = "baz"]
+pub fn bak() {}
+
+fn main() {}

tests/ui/attributes/mixed_export_name_and_no_mangle.rs

@@ -0,0 +1,16 @@
+// issue: rust-lang/rust#47446
+//@ run-rustfix
+//@ check-pass
+
+#![warn(unused_attributes)]
+#[no_mangle]
+//~^ WARN `#[no_mangle]` attribute may not be used in combination with `#[export_name]` [unused_attributes]
+#[export_name = "foo"]
+pub fn bar() {}
+
+#[unsafe(no_mangle)]
+//~^ WARN `#[unsafe(no_mangle)]` attribute may not be used in combination with `#[export_name]` [unused_attributes]
+#[export_name = "baz"]
+pub fn bak() {}
+
+fn main() {}

tests/ui/attributes/mixed_export_name_and_no_mangle.stderr

@@ -0,0 +1,39 @@
+warning: `#[no_mangle]` attribute may not be used in combination with `#[export_name]`
+ --> $DIR/mixed_export_name_and_no_mangle.rs:6:1
+ |
+LL | #[no_mangle]
+ | ^^^^^^^^^^^^ `#[no_mangle]` is ignored
+ |
+note: `#[export_name]` takes precedence
+ --> $DIR/mixed_export_name_and_no_mangle.rs:8:1
+ |
+LL | #[export_name = "foo"]
+ | ^^^^^^^^^^^^^^^^^^^^^^
+note: the lint level is defined here
+ --> $DIR/mixed_export_name_and_no_mangle.rs:5:9
+ |
+LL | #![warn(unused_attributes)]
+ | ^^^^^^^^^^^^^^^^^
+help: remove the `#[no_mangle]` attribute
+ |
+LL - #[no_mangle]
+ |
+
+warning: `#[unsafe(no_mangle)]` attribute may not be used in combination with `#[export_name]`
+ --> $DIR/mixed_export_name_and_no_mangle.rs:11:1
+ |
+LL | #[unsafe(no_mangle)]
+ | ^^^^^^^^^^^^^^^^^^^^ `#[unsafe(no_mangle)]` is ignored
+ |
+note: `#[export_name]` takes precedence
+ --> $DIR/mixed_export_name_and_no_mangle.rs:13:1
+ |
+LL | #[export_name = "baz"]
+ | ^^^^^^^^^^^^^^^^^^^^^^
+help: remove the `#[unsafe(no_mangle)]` attribute
+ |
+LL - #[unsafe(no_mangle)]
+ |
+
+warning: 2 warnings emitted
+