Rollup merge of rust-lang#121695 - oli-obk:split_ty_utils, r=compiler-errors

Split rustc_type_ir to avoid rustc_ast from depending on it

unblocks rust-lang#121576

and resolves a FIXME in `rustc_ast`'s `Cargo.toml`

The new crate is tiny, but it will get bigger in rust-lang#121576

Author: GuillaumeGomez

Cargo.lock

@@ -3417,18 +3417,29 @@ version = "0.0.0"
 dependencies = [
  "bitflags 2.4.2",
  "memchr",
+ "rustc_ast_ir",
  "rustc_data_structures",
  "rustc_index",
  "rustc_lexer",
  "rustc_macros",
  "rustc_serialize",
  "rustc_span",
- "rustc_type_ir",
  "smallvec",
  "thin-vec",
  "tracing",
 ]
 
+[[package]]
+name = "rustc_ast_ir"
+version = "0.0.0"
+dependencies = [
+ "rustc_data_structures",
+ "rustc_macros",
+ "rustc_serialize",
+ "rustc_span",
+ "smallvec",
+]
+
 [[package]]
 name = "rustc_ast_lowering"
 version = "0.0.0"
@@ -4181,6 +4192,7 @@ dependencies = [
  "rustc_apfloat",
  "rustc_arena",
  "rustc_ast",
+ "rustc_ast_ir",
  "rustc_attr",
  "rustc_data_structures",
  "rustc_error_messages",
@@ -4661,6 +4673,7 @@ version = "0.0.0"
 dependencies = [
  "bitflags 2.4.2",
  "derivative",
+ "rustc_ast_ir",
  "rustc_data_structures",
  "rustc_index",
  "rustc_macros",

compiler/rustc_ast/Cargo.toml

@@ -8,14 +8,13 @@ edition = "2021"
 # tidy-alphabetical-start
 bitflags = "2.4.1"
 memchr = "=2.5.0"
+rustc_ast_ir = { path = "../rustc_ast_ir" }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_index = { path = "../rustc_index" }
 rustc_lexer = { path = "../rustc_lexer" }
 rustc_macros = { path = "../rustc_macros" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_span = { path = "../rustc_span" }
-# For Mutability and Movability, which could be uplifted into a common crate.
-rustc_type_ir = { path = "../rustc_type_ir" }
 smallvec = { version = "1.8.1", features = ["union", "may_dangle"] }
 thin-vec = "0.2.12"
 tracing = "0.1"

compiler/rustc_ast/src/ast.rs

@@ -27,6 +27,7 @@ pub use UnsafeSource::*;
 use crate::ptr::P;
 use crate::token::{self, CommentKind, Delimiter};
 use crate::tokenstream::{DelimSpan, LazyAttrTokenStream, TokenStream};
+pub use rustc_ast_ir::{Movability, Mutability};
 use rustc_data_structures::packed::Pu128;
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_data_structures::stack::ensure_sufficient_stack;
@@ -35,7 +36,6 @@ use rustc_macros::HashStable_Generic;
 use rustc_span::source_map::{respan, Spanned};
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
 use rustc_span::{ErrorGuaranteed, Span, DUMMY_SP};
-pub use rustc_type_ir::{Movability, Mutability};
 use std::fmt;
 use std::mem;
 use thin_vec::{thin_vec, ThinVec};

compiler/rustc_ast_ir/Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+name = "rustc_ast_ir"
+version = "0.0.0"
+edition = "2021"
+
+[dependencies]
+# tidy-alphabetical-start
+rustc_data_structures = { path = "../rustc_data_structures", optional = true }
+rustc_macros = { path = "../rustc_macros", optional = true }
+rustc_serialize = { path = "../rustc_serialize", optional = true }
+rustc_span = { path = "../rustc_span", optional = true }
+smallvec = { version = "1.8.1" }
+# tidy-alphabetical-end
+
+[features]
+default = ["nightly"]
+nightly = [
+    "rustc_serialize",
+    "rustc_data_structures",
+    "rustc_macros",
+    "rustc_span",
+]

compiler/rustc_ast_ir/src/lib.rs

@@ -0,0 +1,68 @@
+#![cfg_attr(feature = "nightly", feature(rustc_attrs))]
+#![cfg_attr(feature = "nightly", allow(internal_features))]
+
+#[cfg(feature = "nightly")]
+#[macro_use]
+extern crate rustc_macros;
+
+/// The movability of a coroutine / closure literal:
+/// whether a coroutine contains self-references, causing it to be `!Unpin`.
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, Copy)]
+#[cfg_attr(feature = "nightly", derive(Encodable, Decodable, HashStable_NoContext))]
+pub enum Movability {
+    /// May contain self-references, `!Unpin`.
+    Static,
+    /// Must not contain self-references, `Unpin`.
+    Movable,
+}
+
+#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, Copy)]
+#[cfg_attr(feature = "nightly", derive(Encodable, Decodable, HashStable_NoContext))]
+pub enum Mutability {
+    // N.B. Order is deliberate, so that Not < Mut
+    Not,
+    Mut,
+}
+
+impl Mutability {
+    pub fn invert(self) -> Self {
+        match self {
+            Mutability::Mut => Mutability::Not,
+            Mutability::Not => Mutability::Mut,
+        }
+    }
+
+    /// Returns `""` (empty string) or `"mut "` depending on the mutability.
+    pub fn prefix_str(self) -> &'static str {
+        match self {
+            Mutability::Mut => "mut ",
+            Mutability::Not => "",
+        }
+    }
+
+    /// Returns `"&"` or `"&mut "` depending on the mutability.
+    pub fn ref_prefix_str(self) -> &'static str {
+        match self {
+            Mutability::Not => "&",
+            Mutability::Mut => "&mut ",
+        }
+    }
+
+    /// Returns `""` (empty string) or `"mutably "` depending on the mutability.
+    pub fn mutably_str(self) -> &'static str {
+        match self {
+            Mutability::Not => "",
+            Mutability::Mut => "mutably ",
+        }
+    }
+
+    /// Return `true` if self is mutable
+    pub fn is_mut(self) -> bool {
+        matches!(self, Self::Mut)
+    }
+
+    /// Return `true` if self is **not** mutable
+    pub fn is_not(self) -> bool {
+        matches!(self, Self::Not)
+    }
+}

compiler/rustc_const_eval/src/errors.rs

@@ -11,11 +11,10 @@ use rustc_middle::mir::interpret::{
     PointerKind, ResourceExhaustionInfo, UndefinedBehaviorInfo, UnsupportedOpInfo,
     ValidationErrorInfo,
 };
-use rustc_middle::ty::{self, Ty};
+use rustc_middle::ty::{self, Mutability, Ty};
 use rustc_span::Span;
 use rustc_target::abi::call::AdjustForForeignAbiError;
 use rustc_target::abi::{Size, WrappingRange};
-use rustc_type_ir::Mutability;
 
 use crate::interpret::InternKind;
 

compiler/rustc_const_eval/src/util/caller_location.rs

@@ -1,10 +1,9 @@
 use rustc_hir::LangItem;
 use rustc_middle::mir;
 use rustc_middle::query::TyCtxtAt;
-use rustc_middle::ty;
 use rustc_middle::ty::layout::LayoutOf;
+use rustc_middle::ty::{self, Mutability};
 use rustc_span::symbol::Symbol;
-use rustc_type_ir::Mutability;
 
 use crate::const_eval::{mk_eval_cx_to_read_const_val, CanAccessMutGlobal, CompileTimeEvalContext};
 use crate::interpret::*;

compiler/rustc_hir_analysis/src/check/errs.rs

@@ -1,9 +1,8 @@
 use rustc_hir as hir;
 use rustc_hir_pretty::qpath_to_string;
 use rustc_lint_defs::builtin::STATIC_MUT_REFS;
-use rustc_middle::ty::TyCtxt;
+use rustc_middle::ty::{Mutability, TyCtxt};
 use rustc_span::Span;
-use rustc_type_ir::Mutability;
 
 use crate::errors;
 

compiler/rustc_middle/Cargo.toml

@@ -17,6 +17,7 @@ rustc-rayon-core = { version = "0.5.0", optional = true }
 rustc_apfloat = "0.2.0"
 rustc_arena = { path = "../rustc_arena" }
 rustc_ast = { path = "../rustc_ast" }
+rustc_ast_ir = { path = "../rustc_ast_ir" }
 rustc_attr = { path = "../rustc_attr" }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_error_messages = { path = "../rustc_error_messages" } # Used for intra-doc links

compiler/rustc_middle/src/mir/interpret/error.rs

@@ -4,6 +4,7 @@ use crate::error;
 use crate::mir::{ConstAlloc, ConstValue};
 use crate::ty::{layout, tls, Ty, TyCtxt, ValTree};
 
+use rustc_ast_ir::Mutability;
 use rustc_data_structures::sync::Lock;
 use rustc_errors::{
     DiagnosticArgName, DiagnosticArgValue, DiagnosticMessage, ErrorGuaranteed, IntoDiagnosticArg,
@@ -12,7 +13,6 @@ use rustc_macros::HashStable;
 use rustc_session::CtfeBacktrace;
 use rustc_span::{def_id::DefId, Span, DUMMY_SP};
 use rustc_target::abi::{call, Align, Size, VariantIdx, WrappingRange};
-use rustc_type_ir::Mutability;
 
 use std::borrow::Cow;
 use std::{any::Any, backtrace::Backtrace, fmt};