Cache derive proc macro expansion with incremental query

Cargo.lock

@@ -3833,11 +3833,13 @@ dependencies = [
  "rustc_lexer",
  "rustc_lint_defs",
  "rustc_macros",
+ "rustc_middle",
  "rustc_parse",
  "rustc_proc_macro",
  "rustc_serialize",
  "rustc_session",
  "rustc_span",
+ "scoped-tls",
  "smallvec",
  "thin-vec",
  "tracing",

compiler/rustc_ast/src/ast.rs

@@ -3243,7 +3243,7 @@ impl UseTree {
 /// Distinguishes between `Attribute`s that decorate items and Attributes that
 /// are contained as statements within items. These two cases need to be
 /// distinguished for pretty-printing.
-#[derive(Clone, PartialEq, Encodable, Decodable, Debug, Copy, HashStable_Generic, Walkable)]
+#[derive(Clone, PartialEq, Encodable, Decodable, Hash, Debug, Copy, HashStable_Generic, Walkable)]
 pub enum AttrStyle {
     Outer,
     Inner,

compiler/rustc_ast/src/token.rs

@@ -15,14 +15,14 @@ use rustc_span::{Ident, Symbol};
 use crate::ast;
 use crate::util::case::Case;
 
-#[derive(Clone, Copy, PartialEq, Encodable, Decodable, Debug, HashStable_Generic)]
+#[derive(Clone, Copy, PartialEq, Hash, Encodable, Decodable, Debug, HashStable_Generic)]
 pub enum CommentKind {
     Line,
     Block,
 }
 
 // This type must not implement `Hash` due to the unusual `PartialEq` impl below.
-#[derive(Copy, Clone, Debug, Encodable, Decodable, HashStable_Generic)]
+#[derive(Copy, Clone, Debug, Hash, Encodable, Decodable, HashStable_Generic)]
 pub enum InvisibleOrigin {
     // From the expansion of a metavariable in a declarative macro.
     MetaVar(MetaVarKind),
@@ -113,7 +113,7 @@ impl fmt::Display for MetaVarKind {
 /// Describes how a sequence of token trees is delimited.
 /// Cannot use `proc_macro::Delimiter` directly because this
 /// structure should implement some additional traits.
-#[derive(Copy, Clone, Debug, PartialEq, Encodable, Decodable, HashStable_Generic)]
+#[derive(Copy, Clone, Debug, PartialEq, Hash, Encodable, Decodable, HashStable_Generic)]
 pub enum Delimiter {
     /// `( ... )`
     Parenthesis,
@@ -175,7 +175,7 @@ impl Delimiter {
 // type. This means that float literals like `1f32` are classified by this type
 // as `Int`. Only upon conversion to `ast::LitKind` will such a literal be
 // given the `Float` kind.
-#[derive(Clone, Copy, PartialEq, Encodable, Decodable, Debug, HashStable_Generic)]
+#[derive(Clone, Copy, PartialEq, Hash, Encodable, Decodable, Debug, HashStable_Generic)]
 pub enum LitKind {
     Bool, // AST only, must never appear in a `Token`
     Byte,
@@ -192,7 +192,7 @@ pub enum LitKind {
 }
 
 /// A literal token.
-#[derive(Clone, Copy, PartialEq, Encodable, Decodable, Debug, HashStable_Generic)]
+#[derive(Clone, Copy, PartialEq, Hash, Encodable, Decodable, Debug, HashStable_Generic)]
 pub struct Lit {
     pub kind: LitKind,
     pub symbol: Symbol,
@@ -338,7 +338,7 @@ fn ident_can_begin_type(name: Symbol, span: Span, is_raw: IdentIsRaw) -> bool {
             .contains(&name)
 }
 
-#[derive(PartialEq, Encodable, Decodable, Debug, Copy, Clone, HashStable_Generic)]
+#[derive(PartialEq, Encodable, Decodable, Hash, Debug, Copy, Clone, HashStable_Generic)]
 pub enum IdentIsRaw {
     No,
     Yes,
@@ -356,7 +356,7 @@ impl From<IdentIsRaw> for bool {
     }
 }
 
-#[derive(Clone, Copy, PartialEq, Encodable, Decodable, Debug, HashStable_Generic)]
+#[derive(Clone, Copy, PartialEq, Hash, Encodable, Decodable, Debug, HashStable_Generic)]
 pub enum TokenKind {
     /* Expression-operator symbols. */
     /// `=`
@@ -506,7 +506,7 @@ pub enum TokenKind {
     Eof,
 }
 
-#[derive(Clone, Copy, PartialEq, Encodable, Decodable, Debug, HashStable_Generic)]
+#[derive(Clone, Copy, PartialEq, Hash, Encodable, Decodable, Debug, HashStable_Generic)]
 pub struct Token {
     pub kind: TokenKind,
     pub span: Span,

compiler/rustc_ast/src/tokenstream.rs

@@ -14,6 +14,7 @@
 //! ownership of the original.
 
 use std::borrow::Cow;
+use std::hash::Hash;
 use std::ops::Range;
 use std::sync::Arc;
 use std::{cmp, fmt, iter, mem};
@@ -31,7 +32,7 @@ use crate::token::{self, Delimiter, Token, TokenKind};
 use crate::{AttrVec, Attribute};
 
 /// Part of a `TokenStream`.
-#[derive(Debug, Clone, PartialEq, Encodable, Decodable, HashStable_Generic)]
+#[derive(Debug, Clone, PartialEq, Hash, Encodable, Decodable, HashStable_Generic)]
 pub enum TokenTree {
     /// A single token. Should never be `OpenDelim` or `CloseDelim`, because
     /// delimiters are implicitly represented by `Delimited`.
@@ -557,14 +558,14 @@ pub struct AttrsTarget {
 }
 
 /// A `TokenStream` is an abstract sequence of tokens, organized into [`TokenTree`]s.
-#[derive(Clone, Debug, Default, Encodable, Decodable)]
+#[derive(Clone, Debug, Default, Hash, Encodable, Decodable)]
 pub struct TokenStream(pub(crate) Arc<Vec<TokenTree>>);
 
 /// Indicates whether a token can join with the following token to form a
 /// compound token. Used for conversions to `proc_macro::Spacing`. Also used to
 /// guide pretty-printing, which is where the `JointHidden` value (which isn't
 /// part of `proc_macro::Spacing`) comes in useful.
-#[derive(Clone, Copy, Debug, PartialEq, Encodable, Decodable, HashStable_Generic)]
+#[derive(Clone, Copy, Debug, PartialEq, Hash, Encodable, Decodable, HashStable_Generic)]
 pub enum Spacing {
     /// The token cannot join with the following token to form a compound
     /// token.
@@ -977,7 +978,7 @@ impl TokenCursor {
     }
 }
 
-#[derive(Debug, Copy, Clone, PartialEq, Encodable, Decodable, HashStable_Generic, Walkable)]
+#[derive(Debug, Copy, Clone, PartialEq, Hash, Encodable, Decodable, HashStable_Generic, Walkable)]
 pub struct DelimSpan {
     pub open: Span,
     pub close: Span,
@@ -1001,7 +1002,7 @@ impl DelimSpan {
     }
 }
 
-#[derive(Copy, Clone, Debug, PartialEq, Encodable, Decodable, HashStable_Generic)]
+#[derive(Copy, Clone, Debug, PartialEq, Hash, Encodable, Decodable, HashStable_Generic)]
 pub struct DelimSpacing {
     pub open: Spacing,
     pub close: Spacing,

compiler/rustc_expand/Cargo.toml

@@ -21,13 +21,15 @@ rustc_hir = { path = "../rustc_hir" }
 rustc_lexer = { path = "../rustc_lexer" }
 rustc_lint_defs = { path = "../rustc_lint_defs" }
 rustc_macros = { path = "../rustc_macros" }
+rustc_middle = { path = "../rustc_middle" }
 rustc_parse = { path = "../rustc_parse" }
 # We must use the proc_macro version that we will compile proc-macros against,
 # not the one from our own sysroot.
 rustc_proc_macro = { path = "../rustc_proc_macro" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_session = { path = "../rustc_session" }
 rustc_span = { path = "../rustc_span" }
+scoped-tls = "1.0"
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
 thin-vec = "0.2.12"
 tracing = "0.1"

compiler/rustc_expand/src/lib.rs

@@ -31,4 +31,8 @@ pub mod module;
 #[allow(rustc::untranslatable_diagnostic)]
 pub mod proc_macro;
 
+pub fn provide(providers: &mut rustc_middle::util::Providers) {
+    providers.derive_macro_expansion = proc_macro::provide_derive_macro_expansion;
+}
+
 rustc_fluent_macro::fluent_messages! { "../messages.ftl" }