Rollup merge of #117871 - klensy:unused-pub, r=cjgillot

remove unused pub fns

This removes some unused `pub fn`; also fixes few obsoleted fn names or added fixmes with reminders to update them.

15 files changed, 5 insertions, 248 deletions

diff --git a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
index 245baad2612..df4cd8ea0bd 100644
--- a/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm/ffi.rs
@@ -891,7 +891,6 @@ extern "C" {
     pub fn LLVMSetMetadata<'a>(Val: &'a Value, KindID: c_uint, Node: &'a Value);
     pub fn LLVMGlobalSetMetadata<'a>(Val: &'a Value, KindID: c_uint, Metadata: &'a Metadata);
     pub fn LLVMValueAsMetadata(Node: &Value) -> &Metadata;
-    pub fn LLVMIsAFunction(Val: &Value) -> Option<&Value>;
 
     // Operations on constants of any type
     pub fn LLVMConstNull(Ty: &Type) -> &Value;
@@ -955,7 +954,6 @@ extern "C" {
     pub fn LLVMConstPtrToInt<'a>(ConstantVal: &'a Value, ToType: &'a Type) -> &'a Value;
     pub fn LLVMConstIntToPtr<'a>(ConstantVal: &'a Value, ToType: &'a Type) -> &'a Value;
     pub fn LLVMConstBitCast<'a>(ConstantVal: &'a Value, ToType: &'a Type) -> &'a Value;
-    pub fn LLVMConstPointerCast<'a>(ConstantVal: &'a Value, ToType: &'a Type) -> &'a Value;
     pub fn LLVMGetAggregateElement(ConstantVal: &Value, Idx: c_uint) -> Option<&Value>;
 
     // Operations on global variables, functions, and aliases (globals)
@@ -2346,11 +2344,6 @@ extern "C" {
         len: usize,
         Identifier: *const c_char,
     ) -> Option<&Module>;
-    pub fn LLVMRustGetBitcodeSliceFromObjectData(
-        Data: *const u8,
-        len: usize,
-        out_len: &mut usize,
-    ) -> *const u8;
     pub fn LLVMRustGetSliceFromObjectDataByName(
         data: *const u8,
         len: usize,
diff --git a/compiler/rustc_codegen_llvm/src/type_.rs b/compiler/rustc_codegen_llvm/src/type_.rs
index 06b7703672f..447c4ed1f0c 100644
--- a/compiler/rustc_codegen_llvm/src/type_.rs
+++ b/compiler/rustc_codegen_llvm/src/type_.rs
@@ -227,10 +227,6 @@ impl<'ll, 'tcx> BaseTypeMethods<'tcx> for CodegenCx<'ll, 'tcx> {
 }
 
 impl Type {
-    pub fn i8_llcx(llcx: &llvm::Context) -> &Type {
-        unsafe { llvm::LLVMInt8TypeInContext(llcx) }
-    }
-
     /// Creates an integer type with the given number of bits, e.g., i24
     pub fn ix_llcx(llcx: &llvm::Context, num_bits: u64) -> &Type {
         unsafe { llvm::LLVMIntTypeInContext(llcx, num_bits as c_uint) }
diff --git a/compiler/rustc_const_eval/src/interpret/projection.rs b/compiler/rustc_const_eval/src/interpret/projection.rs
index 6694c43c992..c8977aac0fc 100644
--- a/compiler/rustc_const_eval/src/interpret/projection.rs
+++ b/compiler/rustc_const_eval/src/interpret/projection.rs
@@ -256,13 +256,13 @@ where
     }
 
     /// Iterates over all fields of an array. Much more efficient than doing the
-    /// same by repeatedly calling `operand_index`.
+    /// same by repeatedly calling `project_index`.
     pub fn project_array_fields<'a, P: Projectable<'tcx, M::Provenance>>(
         &self,
         base: &'a P,
     ) -> InterpResult<'tcx, ArrayIterator<'tcx, 'a, M::Provenance, P>> {
         let abi::FieldsShape::Array { stride, .. } = base.layout().fields else {
-            span_bug!(self.cur_span(), "operand_array_fields: expected an array layout");
+            span_bug!(self.cur_span(), "project_array_fields: expected an array layout");
         };
         let len = base.len(self)?;
         let field_layout = base.layout().field(self, 0);
diff --git a/compiler/rustc_const_eval/src/transform/promote_consts.rs b/compiler/rustc_const_eval/src/transform/promote_consts.rs
index 66b813e4e59..8b2ea2dc21d 100644
--- a/compiler/rustc_const_eval/src/transform/promote_consts.rs
+++ b/compiler/rustc_const_eval/src/transform/promote_consts.rs
@@ -1023,36 +1023,3 @@ pub fn promote_candidates<'tcx>(
 
     promotions
 }
-
-/// This function returns `true` if the function being called in the array
-/// repeat expression is a `const` function.
-pub fn is_const_fn_in_array_repeat_expression<'tcx>(
-    ccx: &ConstCx<'_, 'tcx>,
-    place: &Place<'tcx>,
-    body: &Body<'tcx>,
-) -> bool {
-    match place.as_local() {
-        // rule out cases such as: `let my_var = some_fn(); [my_var; N]`
-        Some(local) if body.local_decls[local].is_user_variable() => return false,
-        None => return false,
-        _ => {}
-    }
-
-    for block in body.basic_blocks.iter() {
-        if let Some(Terminator { kind: TerminatorKind::Call { func, destination, .. }, .. }) =
-            &block.terminator
-        {
-            if let Operand::Constant(box ConstOperand { const_, .. }) = func {
-                if let ty::FnDef(def_id, _) = *const_.ty().kind() {
-                    if destination == place {
-                        if ccx.tcx.is_const_fn(def_id) {
-                            return true;
-                        }
-                    }
-                }
-            }
-        }
-    }
-
-    false
-}
diff --git a/compiler/rustc_graphviz/src/lib.rs b/compiler/rustc_graphviz/src/lib.rs
index 9abd7aec98d..eba3215d931 100644
--- a/compiler/rustc_graphviz/src/lib.rs
+++ b/compiler/rustc_graphviz/src/lib.rs
@@ -522,33 +522,6 @@ impl<'a> LabelText<'a> {
             HtmlStr(ref s) => format!("<{s}>"),
         }
     }
-
-    /// Decomposes content into string suitable for making EscStr that
-    /// yields same content as self. The result obeys the law
-    /// render(`lt`) == render(`EscStr(lt.pre_escaped_content())`) for
-    /// all `lt: LabelText`.
-    fn pre_escaped_content(self) -> Cow<'a, str> {
-        match self {
-            EscStr(s) => s,
-            LabelStr(s) => {
-                if s.contains('\\') {
-                    s.escape_default().to_string().into()
-                } else {
-                    s
-                }
-            }
-            HtmlStr(s) => s,
-        }
-    }
-
-    /// Puts `suffix` on a line below this label, with a blank line separator.
-    pub fn suffix_line(self, suffix: LabelText<'_>) -> LabelText<'static> {
-        let mut prefix = self.pre_escaped_content().into_owned();
-        let suffix = suffix.pre_escaped_content();
-        prefix.push_str(r"\n\n");
-        prefix.push_str(&suffix);
-        EscStr(prefix.into())
-    }
 }
 
 pub type Nodes<'a, N> = Cow<'a, [N]>;
diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
index 773f184472b..47ac7007a77 100644
--- a/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
+++ b/compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs
@@ -609,7 +609,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             return false;
         }
         let pin_did = self.tcx.lang_items().pin_type();
-        // This guards the `unwrap` and `mk_box` below.
+        // This guards the `new_box` below.
         if pin_did.is_none() || self.tcx.lang_items().owned_box().is_none() {
             return false;
         }
diff --git a/compiler/rustc_infer/src/infer/mod.rs b/compiler/rustc_infer/src/infer/mod.rs
index d6c7a24476f..24c5d7bbe21 100644
--- a/compiler/rustc_infer/src/infer/mod.rs
+++ b/compiler/rustc_infer/src/infer/mod.rs
@@ -32,7 +32,7 @@ use rustc_middle::ty::error::{ExpectedFound, TypeError};
 use rustc_middle::ty::fold::BoundVarReplacerDelegate;
 use rustc_middle::ty::fold::{TypeFoldable, TypeFolder, TypeSuperFoldable};
 use rustc_middle::ty::relate::RelateResult;
-use rustc_middle::ty::visit::{TypeVisitable, TypeVisitableExt};
+use rustc_middle::ty::visit::TypeVisitableExt;
 pub use rustc_middle::ty::IntVarValue;
 use rustc_middle::ty::{self, GenericParamDefKind, InferConst, InferTy, Ty, TyCtxt};
 use rustc_middle::ty::{ConstVid, EffectVid, FloatVid, IntVid, TyVid};
@@ -1406,17 +1406,6 @@ impl<'tcx> InferCtxt<'tcx> {
         value.fold_with(&mut r)
     }
 
-    /// Returns the first unresolved type or const variable contained in `T`.
-    pub fn first_unresolved_const_or_ty_var<T>(
-        &self,
-        value: &T,
-    ) -> Option<(ty::Term<'tcx>, Option<Span>)>
-    where
-        T: TypeVisitable<TyCtxt<'tcx>>,
-    {
-        value.visit_with(&mut resolve::UnresolvedTypeOrConstFinder::new(self)).break_value()
-    }
-
     pub fn probe_const_var(&self, vid: ty::ConstVid) -> Result<ty::Const<'tcx>, ty::UniverseIndex> {
         match self.inner.borrow_mut().const_unification_table().probe_value(vid).val {
             ConstVariableValue::Known { value } => Ok(value),
diff --git a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
index b4c8fb1a2f1..d2cd79b456a 100644
--- a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
@@ -1562,32 +1562,6 @@ LLVMRustParseBitcodeForLTO(LLVMContextRef Context,
   return wrap(std::move(*SrcOrError).release());
 }
 
-// Find the bitcode section in the object file data and return it as a slice.
-// Fail if the bitcode section is present but empty.
-//
-// On success, the return value is the pointer to the start of the slice and
-// `out_len` is filled with the (non-zero) length. On failure, the return value
-// is `nullptr` and `out_len` is set to zero.
-extern "C" const char*
-LLVMRustGetBitcodeSliceFromObjectData(const char *data,
-                                      size_t len,
-                                      size_t *out_len) {
-  *out_len = 0;
-
-  StringRef Data(data, len);
-  MemoryBufferRef Buffer(Data, ""); // The id is unused.
-
-  Expected<MemoryBufferRef> BitcodeOrError =
-    object::IRObjectFile::findBitcodeInMemBuffer(Buffer);
-  if (!BitcodeOrError) {
-    LLVMRustSetLastError(toString(BitcodeOrError.takeError()).c_str());
-    return nullptr;
-  }
-
-  *out_len = BitcodeOrError->getBufferSize();
-  return BitcodeOrError->getBufferStart();
-}
-
 // Find a section of an object file by name. Fail if the section is missing or
 // empty.
 extern "C" const char *LLVMRustGetSliceFromObjectDataByName(const char *data,
diff --git a/compiler/rustc_middle/src/mir/query.rs b/compiler/rustc_middle/src/mir/query.rs
index 4f98c302298..ab8fef5129b 100644
--- a/compiler/rustc_middle/src/mir/query.rs
+++ b/compiler/rustc_middle/src/mir/query.rs
@@ -42,64 +42,6 @@ pub enum UnsafetyViolationDetails {
     CallToFunctionWith,
 }
 
-impl UnsafetyViolationDetails {
-    pub fn description_and_note(&self) -> (&'static str, &'static str) {
-        use UnsafetyViolationDetails::*;
-        match self {
-            CallToUnsafeFunction => (
-                "call to unsafe function",
-                "consult the function's documentation for information on how to avoid undefined \
-                 behavior",
-            ),
-            UseOfInlineAssembly => (
-                "use of inline assembly",
-                "inline assembly is entirely unchecked and can cause undefined behavior",
-            ),
-            InitializingTypeWith => (
-                "initializing type with `rustc_layout_scalar_valid_range` attr",
-                "initializing a layout restricted type's field with a value outside the valid \
-                 range is undefined behavior",
-            ),
-            CastOfPointerToInt => {
-                ("cast of pointer to int", "casting pointers to integers in constants")
-            }
-            UseOfMutableStatic => (
-                "use of mutable static",
-                "mutable statics can be mutated by multiple threads: aliasing violations or data \
-                 races will cause undefined behavior",
-            ),
-            UseOfExternStatic => (
-                "use of extern static",
-                "extern statics are not controlled by the Rust type system: invalid data, \
-                 aliasing violations or data races will cause undefined behavior",
-            ),
-            DerefOfRawPointer => (
-                "dereference of raw pointer",
-                "raw pointers may be null, dangling or unaligned; they can violate aliasing rules \
-                 and cause data races: all of these are undefined behavior",
-            ),
-            AccessToUnionField => (
-                "access to union field",
-                "the field may not be properly initialized: using uninitialized data will cause \
-                 undefined behavior",
-            ),
-            MutationOfLayoutConstrainedField => (
-                "mutation of layout constrained field",
-                "mutating layout constrained fields cannot statically be checked for valid values",
-            ),
-            BorrowOfLayoutConstrainedField => (
-                "borrow of layout constrained field with interior mutability",
-                "references to fields of layout constrained fields lose the constraints. Coupled \
-                 with interior mutability, the field can be changed to invalid values",
-            ),
-            CallToFunctionWith => (
-                "call to function with `#[target_feature]`",
-                "can only be called if the required target features are available",
-            ),
-        }
-    }
-}
-
 #[derive(Copy, Clone, PartialEq, TyEncodable, TyDecodable, HashStable, Debug)]
 pub struct UnsafetyViolation {
     pub source_info: SourceInfo,
diff --git a/compiler/rustc_middle/src/traits/query.rs b/compiler/rustc_middle/src/traits/query.rs
index 3cceb8b2c59..34c56eb0d7b 100644
--- a/compiler/rustc_middle/src/traits/query.rs
+++ b/compiler/rustc_middle/src/traits/query.rs
@@ -108,17 +108,6 @@ impl<'tcx> DropckOutlivesResult<'tcx> {
             tcx.sess.emit_err(DropCheckOverflow { span, ty, overflow_ty: *overflow_ty });
         }
     }
-
-    pub fn into_kinds_reporting_overflows(
-        self,
-        tcx: TyCtxt<'tcx>,
-        span: Span,
-        ty: Ty<'tcx>,
-    ) -> Vec<GenericArg<'tcx>> {
-        self.report_overflows(tcx, span, ty);
-        let DropckOutlivesResult { kinds, overflows: _ } = self;
-        kinds
-    }
 }
 
 /// A set of constraints that need to be satisfied in order for
diff --git a/compiler/rustc_middle/src/ty/generic_args.rs b/compiler/rustc_middle/src/ty/generic_args.rs
index c1063d6a5f0..fa68923b2c1 100644
--- a/compiler/rustc_middle/src/ty/generic_args.rs
+++ b/compiler/rustc_middle/src/ty/generic_args.rs
@@ -604,13 +604,6 @@ impl<T> EarlyBinder<Option<T>> {
     }
 }
 
-impl<T, U> EarlyBinder<(T, U)> {
-    pub fn transpose_tuple2(self) -> (EarlyBinder<T>, EarlyBinder<U>) {
-        let EarlyBinder { value: (lhs, rhs) } = self;
-        (EarlyBinder { value: lhs }, EarlyBinder { value: rhs })
-    }
-}
-
 impl<'tcx, 's, I: IntoIterator> EarlyBinder<I>
 where
     I::Item: TypeFoldable<TyCtxt<'tcx>>,
diff --git a/compiler/rustc_middle/src/ty/mod.rs b/compiler/rustc_middle/src/ty/mod.rs
index 90cc6f1fb92..1e50ccba770 100644
--- a/compiler/rustc_middle/src/ty/mod.rs
+++ b/compiler/rustc_middle/src/ty/mod.rs
@@ -42,7 +42,6 @@ use rustc_errors::{DiagnosticBuilder, ErrorGuaranteed, StashKey};
 use rustc_hir as hir;
 use rustc_hir::def::{CtorKind, CtorOf, DefKind, DocLinkResMap, LifetimeRes, Res};
 use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, LocalDefId, LocalDefIdMap};
-use rustc_hir::Node;
 use rustc_index::IndexVec;
 use rustc_macros::HashStable;
 use rustc_query_system::ich::StableHashingContext;
@@ -1301,25 +1300,6 @@ impl<'tcx> Predicate<'tcx> {
         }
     }
 
-    pub fn to_opt_type_outlives(self) -> Option<PolyTypeOutlivesPredicate<'tcx>> {
-        let predicate = self.kind();
-        match predicate.skip_binder() {
-            PredicateKind::Clause(ClauseKind::TypeOutlives(data)) => Some(predicate.rebind(data)),
-            PredicateKind::Clause(ClauseKind::Trait(..))
-            | PredicateKind::Clause(ClauseKind::ConstArgHasType(..))
-            | PredicateKind::Clause(ClauseKind::Projection(..))
-            | PredicateKind::AliasRelate(..)
-            | PredicateKind::Subtype(..)
-            | PredicateKind::Coerce(..)
-            | PredicateKind::Clause(ClauseKind::RegionOutlives(..))
-            | PredicateKind::Clause(ClauseKind::WellFormed(..))
-            | PredicateKind::ObjectSafe(..)
-            | PredicateKind::Clause(ClauseKind::ConstEvaluatable(..))
-            | PredicateKind::ConstEquate(..)
-            | PredicateKind::Ambiguous => None,
-        }
-    }
-
     /// Matches a `PredicateKind::Clause` and turns it into a `Clause`, otherwise returns `None`.
     pub fn as_clause(self) -> Option<Clause<'tcx>> {
         match self.kind().skip_binder() {
@@ -2532,22 +2512,6 @@ impl<'tcx> TyCtxt<'tcx> {
     }
 }
 
-/// Yields the parent function's `LocalDefId` if `def_id` is an `impl Trait` definition.
-pub fn is_impl_trait_defn(tcx: TyCtxt<'_>, def_id: DefId) -> Option<LocalDefId> {
-    let def_id = def_id.as_local()?;
-    if let Node::Item(item) = tcx.hir().get_by_def_id(def_id) {
-        if let hir::ItemKind::OpaqueTy(opaque_ty) = item.kind {
-            return match opaque_ty.origin {
-                hir::OpaqueTyOrigin::FnReturn(parent) | hir::OpaqueTyOrigin::AsyncFn(parent) => {
-                    Some(parent)
-                }
-                hir::OpaqueTyOrigin::TyAlias { .. } => None,
-            };
-        }
-    }
-    None
-}
-
 pub fn int_ty(ity: ast::IntTy) -> IntTy {
     match ity {
         ast::IntTy::Isize => IntTy::Isize,
diff --git a/compiler/rustc_middle/src/ty/util.rs b/compiler/rustc_middle/src/ty/util.rs
index e9f65d99a2e..97b7f952248 100644
--- a/compiler/rustc_middle/src/ty/util.rs
+++ b/compiler/rustc_middle/src/ty/util.rs
@@ -701,22 +701,6 @@ impl<'tcx> TyCtxt<'tcx> {
             .map(|decl| ty::EarlyBinder::bind(decl.ty))
     }
 
-    /// Normalizes all opaque types in the given value, replacing them
-    /// with their underlying types.
-    pub fn expand_opaque_types(self, val: Ty<'tcx>) -> Ty<'tcx> {
-        let mut visitor = OpaqueTypeExpander {
-            seen_opaque_tys: FxHashSet::default(),
-            expanded_cache: FxHashMap::default(),
-            primary_def_id: None,
-            found_recursion: false,
-            found_any_recursion: false,
-            check_recursion: false,
-            expand_coroutines: false,
-            tcx: self,
-        };
-        val.fold_with(&mut visitor)
-    }
-
     /// Expands the given impl trait type, stopping if the type is recursive.
     #[instrument(skip(self), level = "debug", ret)]
     pub fn try_expand_impl_trait_type(
diff --git a/compiler/rustc_span/src/lib.rs b/compiler/rustc_span/src/lib.rs
index 6400ba488bb..76be546e945 100644
--- a/compiler/rustc_span/src/lib.rs
+++ b/compiler/rustc_span/src/lib.rs
@@ -139,13 +139,6 @@ pub fn set_session_globals_then<R>(session_globals: &SessionGlobals, f: impl FnO
     SESSION_GLOBALS.set(session_globals, f)
 }
 
-pub fn create_default_session_if_not_set_then<R, F>(f: F) -> R
-where
-    F: FnOnce(&SessionGlobals) -> R,
-{
-    create_session_if_not_set_then(edition::DEFAULT_EDITION, f)
-}
-
 pub fn create_session_if_not_set_then<R, F>(edition: Edition, f: F) -> R
 where
     F: FnOnce(&SessionGlobals) -> R,
diff --git a/compiler/rustc_trait_selection/src/traits/coherence.rs b/compiler/rustc_trait_selection/src/traits/coherence.rs
index f3993ec2566..951b353647c 100644
--- a/compiler/rustc_trait_selection/src/traits/coherence.rs
+++ b/compiler/rustc_trait_selection/src/traits/coherence.rs
@@ -330,7 +330,7 @@ fn equate_impl_headers<'tcx>(
                 impl1.self_ty,
                 impl2.self_ty,
             ),
-            _ => bug!("mk_eq_impl_headers given mismatched impl kinds"),
+            _ => bug!("equate_impl_headers given mismatched impl kinds"),
         };
 
     result.map(|infer_ok| infer_ok.obligations).ok()