Rollup merge of #65455 - nnethercote:avoid-unnecessary-TokenTree-to-TokenStream-conversions, r=petrochenkov

Avoid unnecessary `TokenTree` to `TokenStream` conversions

A `TokenStream` contains any number of `TokenTrees`. Therefore, a single `TokenTree` can be promoted to a `TokenStream`. But doing so costs two allocations: one for the single-element `Vec`, and one for the `Lrc`. (An `IsJoint` value also must be added; the default is `NonJoint`.)

The current code converts `TokenTree`s to `TokenStream`s unnecessarily in a few places. This PR removes some of these unnecessary conversions, both simplifying the code and speeding it up.

r? @petrochenkov

src/libsyntax/attr/mod.rs

@@ -22,7 +22,7 @@ use crate::ptr::P;
 use crate::sess::ParseSess;
 use crate::symbol::{sym, Symbol};
 use crate::ThinVec;
-use crate::tokenstream::{TokenStream, TokenTree, DelimSpan};
+use crate::tokenstream::{DelimSpan, TokenStream, TokenTree, TreeAndJoint};
 use crate::GLOBALS;
 
 use log::debug;
@@ -463,7 +463,7 @@ pub fn first_attr_value_str_by_name(attrs: &[Attribute], name: Symbol) -> Option
 }
 
 impl MetaItem {
-    fn tokens(&self) -> TokenStream {
+    fn token_trees_and_joints(&self) -> Vec<TreeAndJoint> {
         let mut idents = vec![];
         let mut last_pos = BytePos(0 as u32);
         for (i, segment) in self.path.segments.iter().enumerate() {
@@ -477,8 +477,8 @@ impl MetaItem {
             idents.push(TokenTree::Token(Token::from_ast_ident(segment.ident)).into());
             last_pos = segment.ident.span.hi();
         }
-        self.kind.tokens(self.span).append_to_tree_and_joint_vec(&mut idents);
-        TokenStream::new(idents)
+        idents.extend(self.kind.token_trees_and_joints(self.span));
+        idents
     }
 
     fn from_tokens<I>(tokens: &mut iter::Peekable<I>) -> Option<MetaItem>
@@ -537,13 +537,14 @@ impl MetaItem {
 }
 
 impl MetaItemKind {
-    pub fn tokens(&self, span: Span) -> TokenStream {
+    pub fn token_trees_and_joints(&self, span: Span) -> Vec<TreeAndJoint> {
         match *self {
-            MetaItemKind::Word => TokenStream::default(),
+            MetaItemKind::Word => vec![],
             MetaItemKind::NameValue(ref lit) => {
-                let mut vec = vec![TokenTree::token(token::Eq, span).into()];
-                lit.tokens().append_to_tree_and_joint_vec(&mut vec);
-                TokenStream::new(vec)
+                vec![
+                    TokenTree::token(token::Eq, span).into(),
+                    lit.token_tree().into(),
+                ]
             }
             MetaItemKind::List(ref list) => {
                 let mut tokens = Vec::new();
@@ -551,17 +552,26 @@ impl MetaItemKind {
                     if i > 0 {
                         tokens.push(TokenTree::token(token::Comma, span).into());
                     }
-                    item.tokens().append_to_tree_and_joint_vec(&mut tokens);
+                    tokens.extend(item.token_trees_and_joints())
                 }
-                TokenTree::Delimited(
-                    DelimSpan::from_single(span),
-                    token::Paren,
-                    TokenStream::new(tokens).into(),
-                ).into()
+                vec![
+                    TokenTree::Delimited(
+                        DelimSpan::from_single(span),
+                        token::Paren,
+                        TokenStream::new(tokens).into(),
+                    ).into()
+                ]
             }
         }
     }
 
+    // Premature conversions of `TokenTree`s to `TokenStream`s can hurt
+    // performance. Do not use this function if `token_trees_and_joints()` can
+    // be used instead.
+    pub fn tokens(&self, span: Span) -> TokenStream {
+        TokenStream::new(self.token_trees_and_joints(span))
+    }
+
     fn from_tokens<I>(tokens: &mut iter::Peekable<I>) -> Option<MetaItemKind>
         where I: Iterator<Item = TokenTree>,
     {
@@ -603,10 +613,10 @@ impl NestedMetaItem {
         }
     }
 
-    fn tokens(&self) -> TokenStream {
+    fn token_trees_and_joints(&self) -> Vec<TreeAndJoint> {
         match *self {
-            NestedMetaItem::MetaItem(ref item) => item.tokens(),
-            NestedMetaItem::Literal(ref lit) => lit.tokens(),
+            NestedMetaItem::MetaItem(ref item) => item.token_trees_and_joints(),
+            NestedMetaItem::Literal(ref lit) => vec![lit.token_tree().into()],
         }
     }
 

src/libsyntax/parse/literal.rs

@@ -3,7 +3,7 @@
 use crate::ast::{self, Lit, LitKind};
 use crate::parse::token::{self, Token};
 use crate::symbol::{kw, sym, Symbol};
-use crate::tokenstream::{TokenStream, TokenTree};
+use crate::tokenstream::TokenTree;
 
 use log::debug;
 use rustc_data_structures::sync::Lrc;
@@ -216,13 +216,13 @@ impl Lit {
         Lit { token: kind.to_lit_token(), kind, span }
     }
 
-    /// Losslessly convert an AST literal into a token stream.
-    crate fn tokens(&self) -> TokenStream {
+    /// Losslessly convert an AST literal into a token tree.
+    crate fn token_tree(&self) -> TokenTree {
         let token = match self.token.kind {
             token::Bool => token::Ident(self.token.symbol, false),
             _ => token::Literal(self.token),
         };
-        TokenTree::token(token, self.span).into()
+        TokenTree::token(token, self.span)
     }
 }
 

src/libsyntax/parse/parser.rs

@@ -285,10 +285,10 @@ impl TokenCursor {
             token::NoDelim,
             &if doc_comment_style(&name.as_str()) == AttrStyle::Inner {
                 [TokenTree::token(token::Pound, sp), TokenTree::token(token::Not, sp), body]
-                    .iter().cloned().collect::<TokenStream>().into()
+                    .iter().cloned().collect::<TokenStream>()
             } else {
                 [TokenTree::token(token::Pound, sp), body]
-                    .iter().cloned().collect::<TokenStream>().into()
+                    .iter().cloned().collect::<TokenStream>()
             },
         )));
 

src/libsyntax/parse/parser/attr.rs

@@ -6,7 +6,6 @@ use crate::tokenstream::{TokenStream, TokenTree};
 use crate::source_map::Span;
 
 use log::debug;
-use smallvec::smallvec;
 
 #[derive(Debug)]
 enum InnerAttributeParsePolicy<'a> {
@@ -193,15 +192,15 @@ impl<'a> Parser<'a> {
                         is_interpolated_expr = true;
                     }
                 }
-                let tokens = if is_interpolated_expr {
+                let token_tree = if is_interpolated_expr {
                     // We need to accept arbitrary interpolated expressions to continue
                     // supporting things like `doc = $expr` that work on stable.
                     // Non-literal interpolated expressions are rejected after expansion.
-                    self.parse_token_tree().into()
+                    self.parse_token_tree()
                 } else {
-                    self.parse_unsuffixed_lit()?.tokens()
+                    self.parse_unsuffixed_lit()?.token_tree()
                 };
-                TokenStream::from_streams(smallvec![eq.into(), tokens])
+                TokenStream::new(vec![eq.into(), token_tree.into()])
             } else {
                 TokenStream::default()
             };

src/libsyntax/tokenstream.rs

@@ -202,9 +202,9 @@ impl From<TokenTree> for TreeAndJoint {
     }
 }
 
-impl<T: Into<TokenStream>> iter::FromIterator<T> for TokenStream {
-    fn from_iter<I: IntoIterator<Item = T>>(iter: I) -> Self {
-        TokenStream::from_streams(iter.into_iter().map(Into::into).collect::<SmallVec<_>>())
+impl iter::FromIterator<TokenTree> for TokenStream {
+    fn from_iter<I: IntoIterator<Item = TokenTree>>(iter: I) -> Self {
+        TokenStream::new(iter.into_iter().map(Into::into).collect::<Vec<TreeAndJoint>>())
     }
 }
 
@@ -271,10 +271,6 @@ impl TokenStream {
         }
     }
 
-    pub fn append_to_tree_and_joint_vec(self, vec: &mut Vec<TreeAndJoint>) {
-        vec.extend(self.0.iter().cloned());
-    }
-
     pub fn trees(&self) -> Cursor {
         self.clone().into_trees()
     }