Rollup merge of #61813 - matthewjasper:remove-unnecessary-symbol-ops, r=petrochenkov

Remove some unnecessary symbol interner ops

* Don't gensym symbols that don't need to worry about colliding with other symbols
* Use symbol constants instead of interning string literals in a few places.
* Don't generate a module in `__register_diagnostic`

r? @petrochenkov

Author: Centril

src/librustc_resolve/build_reduced_graph.rs

@@ -305,7 +305,7 @@ impl<'a> Resolver<'a> {
                 }
 
                 // Empty groups `a::b::{}` are turned into synthetic `self` imports
-                // `a::b::c::{self as __dummy}`, so that their prefixes are correctly
+                // `a::b::c::{self as _}`, so that their prefixes are correctly
                 // resolved and checked for privacy/stability/etc.
                 if items.is_empty() && !empty_for_self(&prefix) {
                     let new_span = prefix[prefix.len() - 1].ident.span;
@@ -314,7 +314,7 @@ impl<'a> Resolver<'a> {
                             Ident::new(kw::SelfLower, new_span)
                         ),
                         kind: ast::UseTreeKind::Simple(
-                            Some(Ident::from_str_and_span("__dummy", new_span).gensym()),
+                            Some(Ident::new(kw::Underscore, new_span)),
                             ast::DUMMY_NODE_ID,
                             ast::DUMMY_NODE_ID,
                         ),

src/librustc_resolve/lib.rs

@@ -1519,37 +1519,32 @@ impl<'a> NameBinding<'a> {
 ///
 /// All other types are defined somewhere and possibly imported, but the primitive ones need
 /// special handling, since they have no place of origin.
-#[derive(Default)]
 struct PrimitiveTypeTable {
     primitive_types: FxHashMap<Name, PrimTy>,
 }
 
 impl PrimitiveTypeTable {
     fn new() -> PrimitiveTypeTable {
-        let mut table = PrimitiveTypeTable::default();
-
-        table.intern("bool", Bool);
-        table.intern("char", Char);
-        table.intern("f32", Float(FloatTy::F32));
-        table.intern("f64", Float(FloatTy::F64));
-        table.intern("isize", Int(IntTy::Isize));
-        table.intern("i8", Int(IntTy::I8));
-        table.intern("i16", Int(IntTy::I16));
-        table.intern("i32", Int(IntTy::I32));
-        table.intern("i64", Int(IntTy::I64));
-        table.intern("i128", Int(IntTy::I128));
-        table.intern("str", Str);
-        table.intern("usize", Uint(UintTy::Usize));
-        table.intern("u8", Uint(UintTy::U8));
-        table.intern("u16", Uint(UintTy::U16));
-        table.intern("u32", Uint(UintTy::U32));
-        table.intern("u64", Uint(UintTy::U64));
-        table.intern("u128", Uint(UintTy::U128));
-        table
-    }
-
-    fn intern(&mut self, string: &str, primitive_type: PrimTy) {
-        self.primitive_types.insert(Symbol::intern(string), primitive_type);
+        let mut table = FxHashMap::default();
+
+        table.insert(sym::bool, Bool);
+        table.insert(sym::char, Char);
+        table.insert(sym::f32, Float(FloatTy::F32));
+        table.insert(sym::f64, Float(FloatTy::F64));
+        table.insert(sym::isize, Int(IntTy::Isize));
+        table.insert(sym::i8, Int(IntTy::I8));
+        table.insert(sym::i16, Int(IntTy::I16));
+        table.insert(sym::i32, Int(IntTy::I32));
+        table.insert(sym::i64, Int(IntTy::I64));
+        table.insert(sym::i128, Int(IntTy::I128));
+        table.insert(sym::str, Str);
+        table.insert(sym::usize, Uint(UintTy::Usize));
+        table.insert(sym::u8, Uint(UintTy::U8));
+        table.insert(sym::u16, Uint(UintTy::U16));
+        table.insert(sym::u32, Uint(UintTy::U32));
+        table.insert(sym::u64, Uint(UintTy::U64));
+        table.insert(sym::u128, Uint(UintTy::U128));
+        Self { primitive_types: table }
     }
 }
 

src/libsyntax/diagnostics/plugin.rs

@@ -120,19 +120,7 @@ pub fn expand_register_diagnostic<'cx>(ecx: &'cx mut ExtCtxt<'_>,
         }
     });
 
-    let span = span.apply_mark(ecx.current_expansion.mark);
-
-    let name = Ident::from_str_and_span(&format!("__register_diagnostic_{}", code), span).gensym();
-
-    MacEager::items(smallvec![
-        ecx.item_mod(
-            span,
-            span,
-            name,
-            vec![],
-            vec![],
-        )
-    ])
+    MacEager::items(smallvec![])
 }
 
 #[allow(deprecated)]

src/libsyntax/ext/tt/macro_rules.rs

@@ -249,8 +249,9 @@ pub fn compile(
     def: &ast::Item,
     edition: Edition
 ) -> SyntaxExtension {
-    let lhs_nm = ast::Ident::from_str("lhs").gensym();
-    let rhs_nm = ast::Ident::from_str("rhs").gensym();
+    let lhs_nm = ast::Ident::new(sym::lhs, def.span);
+    let rhs_nm = ast::Ident::new(sym::rhs, def.span);
+    let tt_spec = ast::Ident::new(sym::tt, def.span);
 
     // Parse the macro_rules! invocation
     let body = match def.node {
@@ -266,9 +267,9 @@ pub fn compile(
     let argument_gram = vec![
         quoted::TokenTree::Sequence(DelimSpan::dummy(), Lrc::new(quoted::SequenceRepetition {
             tts: vec![
-                quoted::TokenTree::MetaVarDecl(def.span, lhs_nm, ast::Ident::from_str("tt")),
+                quoted::TokenTree::MetaVarDecl(def.span, lhs_nm, tt_spec),
                 quoted::TokenTree::token(token::FatArrow, def.span),
-                quoted::TokenTree::MetaVarDecl(def.span, rhs_nm, ast::Ident::from_str("tt")),
+                quoted::TokenTree::MetaVarDecl(def.span, rhs_nm, tt_spec),
             ],
             separator: Some(Token::new(
                 if body.legacy { token::Semi } else { token::Comma }, def.span
@@ -1115,10 +1116,9 @@ fn has_legal_fragment_specifier(sess: &ParseSess,
                                 tok: &quoted::TokenTree) -> Result<(), String> {
     debug!("has_legal_fragment_specifier({:?})", tok);
     if let quoted::TokenTree::MetaVarDecl(_, _, ref frag_spec) = *tok {
-        let frag_name = frag_spec.as_str();
         let frag_span = tok.span();
-        if !is_legal_fragment_specifier(sess, features, attrs, &frag_name, frag_span) {
-            return Err(frag_name.to_string());
+        if !is_legal_fragment_specifier(sess, features, attrs, frag_spec.name, frag_span) {
+            return Err(frag_spec.to_string());
         }
     }
     Ok(())
@@ -1127,7 +1127,7 @@ fn has_legal_fragment_specifier(sess: &ParseSess,
 fn is_legal_fragment_specifier(_sess: &ParseSess,
                                _features: &Features,
                                _attrs: &[ast::Attribute],
-                               frag_name: &str,
+                               frag_name: Symbol,
                                _frag_span: Span) -> bool {
     /*
      * If new fragment specifiers are invented in nightly, `_sess`,
@@ -1136,9 +1136,9 @@ fn is_legal_fragment_specifier(_sess: &ParseSess,
      * this function.
      */
     match frag_name {
-        "item" | "block" | "stmt" | "expr" | "pat" | "lifetime" |
-        "path" | "ty" | "ident" | "meta" | "tt" | "vis" | "literal" |
-        "" => true,
+        sym::item | sym::block | sym::stmt | sym::expr | sym::pat |
+        sym::lifetime | sym::path | sym::ty | sym::ident | sym::meta | sym::tt |
+        sym::vis | sym::literal | kw::Invalid => true,
         _ => false,
     }
 }

src/libsyntax/test.rs

@@ -327,7 +327,7 @@ fn mk_main(cx: &mut TestCtxt<'_>) -> P<ast::Item> {
     //        }
     let sp = ignored_span(cx, DUMMY_SP);
     let ecx = &cx.ext_cx;
-    let test_id = ecx.ident_of("test").gensym();
+    let test_id = Ident::with_empty_ctxt(sym::test);
 
     // test::test_main_static(...)
     let mut test_runner = cx.test_runner.clone().unwrap_or(
@@ -350,7 +350,7 @@ fn mk_main(cx: &mut TestCtxt<'_>) -> P<ast::Item> {
     let test_extern_stmt = ecx.stmt_item(sp, ecx.item(sp,
         test_id,
         vec![],
-        ast::ItemKind::ExternCrate(Some(sym::test))
+        ast::ItemKind::ExternCrate(None)
     ));
 
     // pub fn main() { ... }

src/libsyntax_pos/symbol.rs

@@ -157,6 +157,7 @@ symbols! {
         bin,
         bind_by_move_pattern_guards,
         block,
+        bool,
         borrowck_graphviz_postflow,
         borrowck_graphviz_preflow,
         box_patterns,
@@ -171,6 +172,7 @@ symbols! {
         cfg_target_has_atomic,
         cfg_target_thread_local,
         cfg_target_vendor,
+        char,
         clone,
         Clone,
         clone_closures,
@@ -351,6 +353,7 @@ symbols! {
         label_break_value,
         lang,
         lang_items,
+        lhs,
         lib,
         lifetime,
         link,
@@ -511,6 +514,7 @@ symbols! {
         result,
         Result,
         Return,
+        rhs,
         rlib,
         rt,
         rtm_target_feature,