diff --git a/compiler/rustc_codegen_gcc/src/consts.rs b/compiler/rustc_codegen_gcc/src/consts.rs index 033afc0f8fbf..8aed04c836ac 100644 --- a/compiler/rustc_codegen_gcc/src/consts.rs +++ b/compiler/rustc_codegen_gcc/src/consts.rs @@ -154,7 +154,7 @@ impl<'gcc, 'tcx> StaticCodegenMethods for CodegenCx<'gcc, 'tcx> { // TODO(antoyo): set link section. } - if attrs.flags.contains(CodegenFnAttrFlags::USED) + if attrs.flags.contains(CodegenFnAttrFlags::USED_COMPILER) || attrs.flags.contains(CodegenFnAttrFlags::USED_LINKER) { self.add_used_global(global.to_rvalue()); diff --git a/compiler/rustc_codegen_llvm/src/consts.rs b/compiler/rustc_codegen_llvm/src/consts.rs index bf81eb648f8a..fe2f20273276 100644 --- a/compiler/rustc_codegen_llvm/src/consts.rs +++ b/compiler/rustc_codegen_llvm/src/consts.rs @@ -527,7 +527,7 @@ impl<'ll> CodegenCx<'ll, '_> { base::set_variable_sanitizer_attrs(g, attrs); - if attrs.flags.contains(CodegenFnAttrFlags::USED) { + if attrs.flags.contains(CodegenFnAttrFlags::USED_COMPILER) { // `USED` and `USED_LINKER` can't be used together. assert!(!attrs.flags.contains(CodegenFnAttrFlags::USED_LINKER)); @@ -551,7 +551,7 @@ impl<'ll> CodegenCx<'ll, '_> { } if attrs.flags.contains(CodegenFnAttrFlags::USED_LINKER) { // `USED` and `USED_LINKER` can't be used together. - assert!(!attrs.flags.contains(CodegenFnAttrFlags::USED)); + assert!(!attrs.flags.contains(CodegenFnAttrFlags::USED_COMPILER)); self.add_used_global(g); } diff --git a/compiler/rustc_codegen_ssa/src/back/symbol_export.rs b/compiler/rustc_codegen_ssa/src/back/symbol_export.rs index 96aec9769d2c..e26f999773dc 100644 --- a/compiler/rustc_codegen_ssa/src/back/symbol_export.rs +++ b/compiler/rustc_codegen_ssa/src/back/symbol_export.rs @@ -128,7 +128,7 @@ fn reachable_non_generics_provider(tcx: TyCtxt<'_>, _: LocalCrate) -> DefIdMap, did: LocalDefId) -> CodegenFnAttrs { ) .emit(); } - codegen_fn_attrs.flags |= CodegenFnAttrFlags::USED; + codegen_fn_attrs.flags |= CodegenFnAttrFlags::USED_COMPILER; } Some(_) => { tcx.dcx().emit_err(errors::ExpectedUsedSymbol { span: attr.span() }); @@ -220,7 +220,7 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: LocalDefId) -> CodegenFnAttrs { || tcx.sess.target.is_like_windows || tcx.sess.target.is_like_wasm); codegen_fn_attrs.flags |= if is_like_elf { - CodegenFnAttrFlags::USED + CodegenFnAttrFlags::USED_COMPILER } else { CodegenFnAttrFlags::USED_LINKER }; diff --git a/compiler/rustc_middle/src/middle/codegen_fn_attrs.rs b/compiler/rustc_middle/src/middle/codegen_fn_attrs.rs index 00da1a6aeec7..f21cf5fa45e6 100644 --- a/compiler/rustc_middle/src/middle/codegen_fn_attrs.rs +++ b/compiler/rustc_middle/src/middle/codegen_fn_attrs.rs @@ -96,49 +96,46 @@ bitflags::bitflags! { /// `#[cold]`: a hint to LLVM that this function, when called, is never on /// the hot path. const COLD = 1 << 0; - /// `#[rustc_allocator]`: a hint to LLVM that the pointer returned from this - /// function is never null and the function has no side effects other than allocating. - const ALLOCATOR = 1 << 1; - /// An indicator that function will never unwind. Will become obsolete - /// once C-unwind is fully stabilized. - const NEVER_UNWIND = 1 << 3; + /// `#[rustc_nounwind]`: An indicator that function will never unwind. + const NEVER_UNWIND = 1 << 1; /// `#[naked]`: an indicator to LLVM that no function prologue/epilogue /// should be generated. - const NAKED = 1 << 4; + const NAKED = 1 << 2; /// `#[no_mangle]`: an indicator that the function's name should be the same /// as its symbol. - const NO_MANGLE = 1 << 5; + const NO_MANGLE = 1 << 3; /// `#[rustc_std_internal_symbol]`: an indicator that this symbol is a /// "weird symbol" for the standard library in that it has slightly /// different linkage, visibility, and reachability rules. - const RUSTC_STD_INTERNAL_SYMBOL = 1 << 6; + const RUSTC_STD_INTERNAL_SYMBOL = 1 << 4; /// `#[thread_local]`: indicates a static is actually a thread local /// piece of memory - const THREAD_LOCAL = 1 << 8; - /// `#[used]`: indicates that LLVM can't eliminate this function (but the + const THREAD_LOCAL = 1 << 5; + /// `#[used(compiler)]`: indicates that LLVM can't eliminate this function (but the /// linker can!). - const USED = 1 << 9; + const USED_COMPILER = 1 << 6; + /// `#[used(linker)]`: + /// indicates that neither LLVM nor the linker will eliminate this function. + const USED_LINKER = 1 << 7; /// `#[track_caller]`: allow access to the caller location - const TRACK_CALLER = 1 << 10; + const TRACK_CALLER = 1 << 8; /// #[ffi_pure]: applies clang's `pure` attribute to a foreign function /// declaration. - const FFI_PURE = 1 << 11; + const FFI_PURE = 1 << 9; /// #[ffi_const]: applies clang's `const` attribute to a foreign function /// declaration. - const FFI_CONST = 1 << 12; - // (Bit 13 was used for `#[cmse_nonsecure_entry]`, but is now unused.) - // (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; + const FFI_CONST = 1 << 10; + /// `#[rustc_allocator]`: a hint to LLVM that the pointer returned from this + /// function is never null and the function has no side effects other than allocating. + const ALLOCATOR = 1 << 11; /// `#[rustc_deallocator]`: a hint to LLVM that the function only deallocates memory. - const DEALLOCATOR = 1 << 16; + const DEALLOCATOR = 1 << 12; /// `#[rustc_reallocator]`: a hint to LLVM that the function only reallocates memory. - const REALLOCATOR = 1 << 17; + const REALLOCATOR = 1 << 13; /// `#[rustc_allocator_zeroed]`: a hint to LLVM that the function only allocates zeroed memory. - const ALLOCATOR_ZEROED = 1 << 18; + const ALLOCATOR_ZEROED = 1 << 14; /// `#[no_builtins]`: indicates that disable implicit builtin knowledge of functions for the function. - const NO_BUILTINS = 1 << 19; + const NO_BUILTINS = 1 << 15; } } rustc_data_structures::external_bitflags_debug! { CodegenFnAttrFlags } diff --git a/compiler/rustc_passes/src/dead.rs b/compiler/rustc_passes/src/dead.rs index 0060e726a8e0..6e5357d80074 100644 --- a/compiler/rustc_passes/src/dead.rs +++ b/compiler/rustc_passes/src/dead.rs @@ -707,7 +707,7 @@ fn has_allow_dead_code_or_lang_attr( // #[used], #[no_mangle], #[export_name], etc also keeps the item alive // forcefully, e.g., for placing it in a specific section. cg_attrs.contains_extern_indicator() - || cg_attrs.flags.contains(CodegenFnAttrFlags::USED) + || cg_attrs.flags.contains(CodegenFnAttrFlags::USED_COMPILER) || cg_attrs.flags.contains(CodegenFnAttrFlags::USED_LINKER) } } diff --git a/compiler/rustc_passes/src/reachable.rs b/compiler/rustc_passes/src/reachable.rs index f0e8fa986fea..7e15267a953b 100644 --- a/compiler/rustc_passes/src/reachable.rs +++ b/compiler/rustc_passes/src/reachable.rs @@ -427,7 +427,7 @@ fn has_custom_linkage(tcx: TyCtxt<'_>, def_id: LocalDefId) -> bool { // FIXME(nbdd0121): `#[used]` are marked as reachable here so it's picked up by // `linked_symbols` in cg_ssa. They won't be exported in binary or cdylib due to their // `SymbolExportLevel::Rust` export level but may end up being exported in dylibs. - || codegen_attrs.flags.contains(CodegenFnAttrFlags::USED) + || codegen_attrs.flags.contains(CodegenFnAttrFlags::USED_COMPILER) || codegen_attrs.flags.contains(CodegenFnAttrFlags::USED_LINKER) } diff --git a/src/tools/miri/src/bin/miri.rs b/src/tools/miri/src/bin/miri.rs index 469fc2649703..7098ef5130dc 100644 --- a/src/tools/miri/src/bin/miri.rs +++ b/src/tools/miri/src/bin/miri.rs @@ -281,7 +281,7 @@ impl rustc_driver::Callbacks for MiriBeRustCompilerCalls { } let codegen_fn_attrs = tcx.codegen_fn_attrs(local_def_id); if codegen_fn_attrs.contains_extern_indicator() - || codegen_fn_attrs.flags.contains(CodegenFnAttrFlags::USED) + || codegen_fn_attrs.flags.contains(CodegenFnAttrFlags::USED_COMPILER) || codegen_fn_attrs.flags.contains(CodegenFnAttrFlags::USED_LINKER) { Some(( diff --git a/src/tools/miri/src/helpers.rs b/src/tools/miri/src/helpers.rs index ff2ec1b3e60a..6a6adc966a89 100644 --- a/src/tools/miri/src/helpers.rs +++ b/src/tools/miri/src/helpers.rs @@ -135,7 +135,7 @@ pub fn iter_exported_symbols<'tcx>( let codegen_attrs = tcx.codegen_fn_attrs(def_id); codegen_attrs.contains_extern_indicator() || codegen_attrs.flags.contains(CodegenFnAttrFlags::RUSTC_STD_INTERNAL_SYMBOL) - || codegen_attrs.flags.contains(CodegenFnAttrFlags::USED) + || codegen_attrs.flags.contains(CodegenFnAttrFlags::USED_COMPILER) || codegen_attrs.flags.contains(CodegenFnAttrFlags::USED_LINKER) }; if exported {