Move builtin attribute logic to new rustc_attr crate.

For now, this is all the crate contains, but more
attribute logic & types will be moved there over time.

Author: Centril

Cargo.lock

@@ -3093,6 +3093,7 @@ dependencies = [
  "rustc-rayon",
  "rustc-rayon-core",
  "rustc_apfloat",
+ "rustc_attr",
  "rustc_data_structures",
  "rustc_errors",
  "rustc_feature",
@@ -3374,6 +3375,7 @@ name = "rustc_ast_passes"
 version = "0.0.0"
 dependencies = [
  "log",
+ "rustc_attr",
  "rustc_data_structures",
  "rustc_errors",
  "rustc_feature",
@@ -3383,12 +3385,28 @@ dependencies = [
  "syntax",
 ]
 
+[[package]]
+name = "rustc_attr"
+version = "0.0.0"
+dependencies = [
+ "rustc_data_structures",
+ "rustc_errors",
+ "rustc_feature",
+ "rustc_macros",
+ "rustc_session",
+ "rustc_span",
+ "serialize",
+ "smallvec 1.0.0",
+ "syntax",
+]
+
 [[package]]
 name = "rustc_builtin_macros"
 version = "0.0.0"
 dependencies = [
  "fmt_macros",
  "log",
+ "rustc_attr",
  "rustc_data_structures",
  "rustc_errors",
  "rustc_expand",
@@ -3411,6 +3429,7 @@ dependencies = [
  "log",
  "rustc",
  "rustc-demangle",
+ "rustc_attr",
  "rustc_codegen_ssa",
  "rustc_codegen_utils",
  "rustc_data_structures",
@@ -3442,6 +3461,7 @@ dependencies = [
  "num_cpus",
  "rustc",
  "rustc_apfloat",
+ "rustc_attr",
  "rustc_codegen_utils",
  "rustc_data_structures",
  "rustc_errors",
@@ -3552,6 +3572,7 @@ version = "0.0.0"
 dependencies = [
  "log",
  "rustc_ast_passes",
+ "rustc_attr",
  "rustc_data_structures",
  "rustc_errors",
  "rustc_feature",
@@ -3628,6 +3649,7 @@ dependencies = [
  "rustc-rayon",
  "rustc_ast_lowering",
  "rustc_ast_passes",
+ "rustc_attr",
  "rustc_builtin_macros",
  "rustc_codegen_llvm",
  "rustc_codegen_ssa",
@@ -3672,6 +3694,7 @@ version = "0.0.0"
 dependencies = [
  "log",
  "rustc",
+ "rustc_attr",
  "rustc_data_structures",
  "rustc_errors",
  "rustc_feature",
@@ -3712,6 +3735,7 @@ dependencies = [
  "log",
  "memmap",
  "rustc",
+ "rustc_attr",
  "rustc_data_structures",
  "rustc_errors",
  "rustc_expand",
@@ -3739,6 +3763,7 @@ dependencies = [
  "polonius-engine",
  "rustc",
  "rustc_apfloat",
+ "rustc_attr",
  "rustc_data_structures",
  "rustc_errors",
  "rustc_hir",
@@ -3761,6 +3786,7 @@ dependencies = [
  "log",
  "rustc",
  "rustc_apfloat",
+ "rustc_attr",
  "rustc_data_structures",
  "rustc_errors",
  "rustc_hir",
@@ -3780,6 +3806,7 @@ version = "0.0.0"
 dependencies = [
  "bitflags",
  "log",
+ "rustc_attr",
  "rustc_data_structures",
  "rustc_errors",
  "rustc_feature",
@@ -3797,6 +3824,7 @@ version = "0.0.0"
 dependencies = [
  "log",
  "rustc",
+ "rustc_attr",
  "rustc_data_structures",
  "rustc_errors",
  "rustc_feature",
@@ -3827,6 +3855,7 @@ version = "0.0.0"
 dependencies = [
  "log",
  "rustc",
+ "rustc_attr",
  "rustc_data_structures",
  "rustc_errors",
  "rustc_hir",
@@ -3844,6 +3873,7 @@ dependencies = [
  "log",
  "rustc",
  "rustc_ast_lowering",
+ "rustc_attr",
  "rustc_data_structures",
  "rustc_errors",
  "rustc_expand",
@@ -3961,6 +3991,7 @@ dependencies = [
  "arena",
  "log",
  "rustc",
+ "rustc_attr",
  "rustc_data_structures",
  "rustc_errors",
  "rustc_hir",

src/librustc/Cargo.toml

@@ -21,6 +21,7 @@ rustc-rayon = "0.3.0"
 rustc-rayon-core = "0.3.0"
 polonius-engine = "0.11.0"
 rustc_apfloat = { path = "../librustc_apfloat" }
+rustc_attr = { path = "../librustc_attr" }
 rustc_feature = { path = "../librustc_feature" }
 rustc_hir = { path = "../librustc_hir" }
 rustc_target = { path = "../librustc_target" }

src/librustc/ich/impls_hir.rs

@@ -3,12 +3,12 @@
 
 use crate::hir::map::DefPathHash;
 use crate::ich::{Fingerprint, NodeIdHashingMode, StableHashingContext};
+use rustc_attr as attr;
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher, ToStableHashKey};
 use rustc_hir as hir;
 use rustc_hir::def_id::{CrateNum, DefId, LocalDefId, CRATE_DEF_INDEX};
 use smallvec::SmallVec;
 use std::mem;
-use syntax::attr;
 
 impl<'ctx> rustc_hir::HashStableContext for StableHashingContext<'ctx> {
     #[inline]

src/librustc/middle/codegen_fn_attrs.rs

@@ -1,6 +1,6 @@
 use crate::mir::mono::Linkage;
+use rustc_attr::{InlineAttr, OptimizeAttr};
 use rustc_span::symbol::Symbol;
-use syntax::attr::{InlineAttr, OptimizeAttr};
 
 #[derive(Clone, RustcEncodable, RustcDecodable, HashStable)]
 pub struct CodegenFnAttrs {

src/librustc/middle/stability.rs

@@ -5,6 +5,7 @@ pub use self::StabilityLevel::*;
 
 use crate::session::{DiagnosticMessageId, Session};
 use crate::ty::{self, TyCtxt};
+use rustc_attr::{self as attr, ConstStability, Deprecation, RustcDeprecation, Stability};
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_errors::{Applicability, DiagnosticBuilder};
 use rustc_feature::GateIssue;
@@ -16,7 +17,6 @@ use rustc_session::lint::{self, BuiltinLintDiagnostics, Lint, LintBuffer};
 use rustc_span::symbol::{sym, Symbol};
 use rustc_span::{MultiSpan, Span};
 use syntax::ast::CRATE_NODE_ID;
-use syntax::attr::{self, ConstStability, Deprecation, RustcDeprecation, Stability};
 use syntax::sess::feature_err_issue;
 
 use std::num::NonZeroU32;

src/librustc/mir/mono.rs

@@ -3,6 +3,7 @@ use crate::ich::{Fingerprint, NodeIdHashingMode, StableHashingContext};
 use crate::session::config::OptLevel;
 use crate::ty::print::obsolete::DefPathBasedNames;
 use crate::ty::{subst::InternalSubsts, Instance, InstanceDef, SymbolName, TyCtxt};
+use rustc_attr::InlineAttr;
 use rustc_data_structures::base_n;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
@@ -12,7 +13,6 @@ use rustc_span::source_map::Span;
 use rustc_span::symbol::Symbol;
 use std::fmt;
 use std::hash::Hash;
-use syntax::attr::InlineAttr;
 
 /// Describes how a monomorphization will be instantiated in object files.
 #[derive(PartialEq)]

src/librustc/traits/on_unimplemented.rs

@@ -3,13 +3,13 @@ use fmt_macros::{Parser, Piece, Position};
 use crate::ty::{self, GenericParamDefKind, TyCtxt};
 use crate::util::common::ErrorReported;
 
+use rustc_attr as attr;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_errors::struct_span_err;
 use rustc_hir::def_id::DefId;
 use rustc_span::symbol::{kw, sym, Symbol};
 use rustc_span::Span;
 use syntax::ast::{MetaItem, NestedMetaItem};
-use syntax::attr;
 
 #[derive(Clone, Debug)]
 pub struct OnUnimplementedFormatString(Symbol);

src/librustc/ty/context.rs

@@ -51,6 +51,7 @@ use rustc_session::config::CrateType;
 use rustc_session::config::{BorrowckMode, OutputFilenames};
 use rustc_session::Session;
 
+use rustc_attr as attr;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::profiling::SelfProfilerRef;
 use rustc_data_structures::sharded::{IntoPointer, ShardedHashMap};
@@ -79,7 +80,6 @@ use std::mem;
 use std::ops::{Bound, Deref};
 use std::sync::Arc;
 use syntax::ast;
-use syntax::attr;
 use syntax::expand::allocator::AllocatorKind;
 
 type InternedSet<'tcx, T> = ShardedHashMap<Interned<'tcx, T>, ()>;

src/librustc/ty/layout.rs

@@ -1,9 +1,9 @@
 use crate::session::{self, DataTypeKind};
 use crate::ty::{self, subst::SubstsRef, ReprOptions, Ty, TyCtxt, TypeFoldable};
 
+use rustc_attr as attr;
 use rustc_span::DUMMY_SP;
 use syntax::ast::{self, Ident, IntTy, UintTy};
-use syntax::attr;
 
 use std::cmp;
 use std::fmt;

src/librustc/ty/mod.rs

@@ -26,6 +26,7 @@ use crate::ty::layout::VariantIdx;
 use crate::ty::subst::{InternalSubsts, Subst, SubstsRef};
 use crate::ty::util::{Discr, IntTypeExt};
 use crate::ty::walk::TypeWalker;
+use rustc_attr as attr;
 use rustc_data_structures::captures::Captures;
 use rustc_data_structures::fx::FxHashMap;
 use rustc_data_structures::fx::FxIndexMap;
@@ -53,7 +54,6 @@ use std::ops::Range;
 use std::slice;
 use std::{mem, ptr};
 use syntax::ast::{self, Constness, Ident, Name, NodeId};
-use syntax::attr;
 
 pub use self::sty::BoundRegion::*;
 pub use self::sty::InferTy::*;

src/librustc/ty/print/pretty.rs

@@ -11,10 +11,10 @@ use rustc_hir::def_id::{CrateNum, DefId, CRATE_DEF_INDEX, LOCAL_CRATE};
 
 use rustc_apfloat::ieee::{Double, Single};
 use rustc_apfloat::Float;
+use rustc_attr::{SignedInt, UnsignedInt};
 use rustc_span::symbol::{kw, Symbol};
 use rustc_target::spec::abi::Abi;
 use syntax::ast;
-use syntax::attr::{SignedInt, UnsignedInt};
 
 use std::cell::Cell;
 use std::collections::BTreeMap;

src/librustc/ty/query/mod.rs

@@ -49,14 +49,14 @@ use rustc_hir::{HirIdSet, ItemLocalId, TraitCandidate};
 use rustc_index::vec::IndexVec;
 use rustc_target::spec::PanicStrategy;
 
+use rustc_attr as attr;
 use rustc_span::symbol::Symbol;
 use rustc_span::{Span, DUMMY_SP};
 use std::any::type_name;
 use std::borrow::Cow;
 use std::ops::Deref;
 use std::sync::Arc;
 use syntax::ast;
-use syntax::attr;
 
 #[macro_use]
 mod plumbing;

src/librustc/ty/util.rs

@@ -10,6 +10,7 @@ use crate::ty::TyKind::*;
 use crate::ty::{self, DefIdTree, GenericParamDefKind, Ty, TyCtxt, TypeFoldable};
 use crate::util::common::ErrorReported;
 use rustc_apfloat::Float as _;
+use rustc_attr::{self as attr, SignedInt, UnsignedInt};
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_hir as hir;
@@ -19,7 +20,6 @@ use rustc_macros::HashStable;
 use rustc_span::Span;
 use std::{cmp, fmt};
 use syntax::ast;
-use syntax::attr::{self, SignedInt, UnsignedInt};
 
 #[derive(Copy, Clone, Debug)]
 pub struct Discr<'tcx> {

src/librustc_ast_passes/Cargo.toml

@@ -10,6 +10,7 @@ path = "lib.rs"
 
 [dependencies]
 log = "0.4"
+rustc_attr = { path = "../librustc_attr" }
 rustc_data_structures = { path = "../librustc_data_structures" }
 rustc_errors = { path = "../librustc_errors" }
 rustc_feature = { path = "../librustc_feature" }

src/librustc_ast_passes/ast_validation.rs

@@ -331,7 +331,7 @@ impl<'a> AstValidator<'a> {
             .flat_map(|i| i.attrs.as_ref())
             .filter(|attr| {
                 let arr = [sym::allow, sym::cfg, sym::cfg_attr, sym::deny, sym::forbid, sym::warn];
-                !arr.contains(&attr.name_or_empty()) && attr::is_builtin_attr(attr)
+                !arr.contains(&attr.name_or_empty()) && rustc_attr::is_builtin_attr(attr)
             })
             .for_each(|attr| {
                 if attr.is_doc_comment() {

src/librustc_attr/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+authors = ["The Rust Project Developers"]
+name = "rustc_attr"
+version = "0.0.0"
+edition = "2018"
+
+[lib]
+name = "rustc_attr"
+path = "lib.rs"
+doctest = false
+
+[dependencies]
+rustc_serialize = { path = "../libserialize", package = "serialize" }
+rustc_errors = { path = "../librustc_errors" }
+rustc_span = { path = "../librustc_span" }
+rustc_data_structures = { path = "../librustc_data_structures" }
+rustc_feature = { path = "../librustc_feature" }
+rustc_macros = { path = "../librustc_macros" }
+smallvec = { version = "1.0", features = ["union", "may_dangle"] }
+rustc_session = { path = "../librustc_session" }
+syntax = { path = "../libsyntax" }

src/libsyntax/attr/builtin.rs renamed to src/librustc_attr/builtin.rs

@@ -1,16 +1,16 @@
 //! Parsing and validation of builtin attributes
 
-use super::{mark_used, MetaItemKind};
-use crate::ast::{self, Attribute, MetaItem, NestedMetaItem};
-use crate::print::pprust;
-use crate::sess::{feature_err, ParseSess};
+use super::mark_used;
 
 use rustc_errors::{struct_span_err, Applicability, Handler};
 use rustc_feature::{find_gated_cfg, is_builtin_attr_name, Features, GatedCfg};
 use rustc_macros::HashStable_Generic;
+use rustc_session::parse::{feature_err, ParseSess};
 use rustc_span::hygiene::Transparency;
 use rustc_span::{symbol::sym, symbol::Symbol, Span};
 use std::num::NonZeroU32;
+use syntax::ast::{self, Attribute, MetaItem, MetaItemKind, NestedMetaItem};
+use syntax::print::pprust;
 
 pub fn is_builtin_attr(attr: &Attribute) -> bool {
     attr.is_doc_comment() || attr.ident().filter(|ident| is_builtin_attr_name(ident.name)).is_some()

src/librustc_attr/lib.rs

@@ -0,0 +1,16 @@
+//! Functions and types dealing with attributes and meta items.
+//!
+//! FIXME(Centril): For now being, much of the logic is still in `syntax::attr`.
+//! The goal is to move the definition of `MetaItem` and things that don't need to be in `syntax`
+//! to this crate.
+
+mod builtin;
+
+pub use builtin::*;
+pub use IntType::*;
+pub use ReprAttr::*;
+pub use StabilityLevel::*;
+
+pub use syntax::attr::*;
+
+pub(crate) use syntax::HashStableContext;

src/librustc_builtin_macros/Cargo.toml

@@ -12,6 +12,7 @@ doctest = false
 [dependencies]
 fmt_macros = { path = "../libfmt_macros" }
 log = "0.4"
+rustc_attr = { path = "../librustc_attr" }
 rustc_data_structures = { path = "../librustc_data_structures" }
 rustc_errors = { path = "../librustc_errors" }
 rustc_feature = { path = "../librustc_feature" }