Rollup merge of rust-lang#77739 - est31:remove_unused_code, r=petrochenkov,varkor

Remove unused code

Rustc has a builtin lint for detecting unused code inside a crate, but when an item is marked `pub`, the code, even if unused inside the entire workspace, is never marked as such. Therefore, I've built [warnalyzer](https://github.com/est31/warnalyzer) to detect unused items in a cross-crate setting.

Closes est31/warnalyzer#2

Author: JohnTitor

compiler/rustc_ast/src/ast.rs

@@ -167,13 +167,6 @@ pub enum GenericArgs {
 }
 
 impl GenericArgs {
-    pub fn is_parenthesized(&self) -> bool {
-        match *self {
-            Parenthesized(..) => true,
-            _ => false,
-        }
-    }
-
     pub fn is_angle_bracketed(&self) -> bool {
         match *self {
             AngleBracketed(..) => true,
@@ -857,13 +850,6 @@ impl BinOpKind {
         }
     }
 
-    pub fn is_shift(&self) -> bool {
-        match *self {
-            BinOpKind::Shl | BinOpKind::Shr => true,
-            _ => false,
-        }
-    }
-
     pub fn is_comparison(&self) -> bool {
         use BinOpKind::*;
         // Note for developers: please keep this as is;
@@ -873,11 +859,6 @@ impl BinOpKind {
             And | Or | Add | Sub | Mul | Div | Rem | BitXor | BitAnd | BitOr | Shl | Shr => false,
         }
     }
-
-    /// Returns `true` if the binary operator takes its arguments by value
-    pub fn is_by_value(&self) -> bool {
-        !self.is_comparison()
-    }
 }
 
 pub type BinOp = Spanned<BinOpKind>;
@@ -896,14 +877,6 @@ pub enum UnOp {
 }
 
 impl UnOp {
-    /// Returns `true` if the unary operator takes its argument by value
-    pub fn is_by_value(u: UnOp) -> bool {
-        match u {
-            UnOp::Neg | UnOp::Not => true,
-            _ => false,
-        }
-    }
-
     pub fn to_string(op: UnOp) -> &'static str {
         match op {
             UnOp::Deref => "*",
@@ -1753,13 +1726,6 @@ impl IntTy {
         }
     }
 
-    pub fn val_to_string(&self, val: i128) -> String {
-        // Cast to a `u128` so we can correctly print `INT128_MIN`. All integral types
-        // are parsed as `u128`, so we wouldn't want to print an extra negative
-        // sign.
-        format!("{}{}", val as u128, self.name_str())
-    }
-
     pub fn bit_width(&self) -> Option<u64> {
         Some(match *self {
             IntTy::Isize => return None,
@@ -1818,10 +1784,6 @@ impl UintTy {
         }
     }
 
-    pub fn val_to_string(&self, val: u128) -> String {
-        format!("{}{}", val, self.name_str())
-    }
-
     pub fn bit_width(&self) -> Option<u64> {
         Some(match *self {
             UintTy::Usize => return None,

compiler/rustc_ast/src/attr/mod.rs

@@ -101,11 +101,6 @@ impl NestedMetaItem {
         self.meta_item().is_some()
     }
 
-    /// Returns `true` if the variant is `Literal`.
-    pub fn is_literal(&self) -> bool {
-        self.literal().is_some()
-    }
-
     /// Returns `true` if `self` is a `MetaItem` and the meta item is a word.
     pub fn is_word(&self) -> bool {
         self.meta_item().map_or(false, |meta_item| meta_item.is_word())
@@ -232,10 +227,6 @@ impl MetaItem {
     pub fn is_value_str(&self) -> bool {
         self.value_str().is_some()
     }
-
-    pub fn is_meta_item_list(&self) -> bool {
-        self.meta_item_list().is_some()
-    }
 }
 
 impl AttrItem {

compiler/rustc_ast/src/token.rs

@@ -54,16 +54,6 @@ pub enum DelimToken {
     NoDelim,
 }
 
-impl DelimToken {
-    pub fn len(self) -> usize {
-        if self == NoDelim { 0 } else { 1 }
-    }
-
-    pub fn is_empty(self) -> bool {
-        self == NoDelim
-    }
-}
-
 #[derive(Clone, Copy, PartialEq, Encodable, Decodable, Debug, HashStable_Generic)]
 pub enum LitKind {
     Bool, // AST only, must never appear in a `Token`

compiler/rustc_ast/src/tokenstream.rs

@@ -295,12 +295,6 @@ impl TokenStream {
                 .collect(),
         ))
     }
-
-    pub fn map<F: FnMut(TokenTree) -> TokenTree>(self, mut f: F) -> TokenStream {
-        TokenStream(Lrc::new(
-            self.0.iter().map(|(tree, is_joint)| (f(tree.clone()), *is_joint)).collect(),
-        ))
-    }
 }
 
 // 99.5%+ of the time we have 1 or 2 elements in this vector.

compiler/rustc_ast/src/util/parser.rs

@@ -231,7 +231,6 @@ impl AssocOp {
     }
 }
 
-pub const PREC_RESET: i8 = -100;
 pub const PREC_CLOSURE: i8 = -40;
 pub const PREC_JUMP: i8 = -30;
 pub const PREC_RANGE: i8 = -10;

compiler/rustc_codegen_llvm/src/llvm/mod.rs

@@ -118,11 +118,6 @@ pub fn SetUnnamedAddress(global: &'a Value, unnamed: UnnamedAddr) {
     }
 }
 
-pub fn set_thread_local(global: &'a Value, is_thread_local: bool) {
-    unsafe {
-        LLVMSetThreadLocal(global, is_thread_local as Bool);
-    }
-}
 pub fn set_thread_local_mode(global: &'a Value, mode: ThreadLocalMode) {
     unsafe {
         LLVMSetThreadLocalMode(global, mode);

compiler/rustc_codegen_ssa/src/back/write.rs

@@ -1519,8 +1519,6 @@ fn start_executing_work<B: ExtraBackendMethods>(
     }
 }
 
-pub const CODEGEN_WORKER_ID: usize = usize::MAX;
-
 /// `FatalError` is explicitly not `Send`.
 #[must_use]
 pub struct WorkerFatalError;

compiler/rustc_codegen_ssa/src/base.rs

@@ -479,8 +479,6 @@ fn get_argc_argv<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
     }
 }
 
-pub const CODEGEN_WORKER_ID: usize = usize::MAX;
-
 pub fn codegen_crate<B: ExtraBackendMethods>(
     backend: B,
     tcx: TyCtxt<'tcx>,

compiler/rustc_data_structures/src/work_queue.rs

@@ -14,12 +14,6 @@ pub struct WorkQueue<T: Idx> {
 }
 
 impl<T: Idx> WorkQueue<T> {
-    /// Creates a new work queue with all the elements from (0..len).
-    #[inline]
-    pub fn with_all(len: usize) -> Self {
-        WorkQueue { deque: (0..len).map(T::new).collect(), set: BitSet::new_filled(len) }
-    }
-
     /// Creates a new work queue that starts empty, where elements range from (0..len).
     #[inline]
     pub fn with_none(len: usize) -> Self {

compiler/rustc_errors/src/diagnostic.rs

@@ -121,11 +121,6 @@ impl Diagnostic {
         self.level == Level::Cancelled
     }
 
-    /// Set the sorting span.
-    pub fn set_sort_span(&mut self, sp: Span) {
-        self.sort_span = sp;
-    }
-
     /// Adds a span/label to be included in the resulting snippet.
     ///
     /// This is pushed onto the [`MultiSpan`] that was created when the diagnostic
@@ -535,14 +530,6 @@ impl Diagnostic {
         &self.message
     }
 
-    /// Used by a lint. Copies over all details *but* the "main
-    /// message".
-    pub fn copy_details_not_message(&mut self, from: &Diagnostic) {
-        self.span = from.span.clone();
-        self.code = from.code.clone();
-        self.children.extend(from.children.iter().cloned())
-    }
-
     /// Convenience function for internal use, clients should use one of the
     /// public methods above.
     pub fn sub(