CoAlloc: Big Squash; const_trait TODO and ICE on Dec 4, 2023

Author: peter-lyons-kehl

compiler/rustc_arena/src/lib.rs

@@ -11,12 +11,16 @@
     html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/",
     test(no_crate_inject, attr(deny(warnings)))
 )]
+#![allow(incomplete_features)]
 #![cfg_attr(not(bootstrap), doc(rust_logo))]
 #![cfg_attr(not(bootstrap), feature(rustdoc_internals))]
 #![feature(core_intrinsics)]
 #![feature(dropck_eyepatch)]
 #![feature(new_uninit)]
 #![feature(maybe_uninit_slice)]
+//#![feature(min_specialization)]
+// TODO CoAlloc specialization!
+#![feature(specialization)]
 #![feature(decl_macro)]
 #![feature(rustc_attrs)]
 #![cfg_attr(test, feature(test))]

compiler/rustc_ast/src/ast.rs

@@ -38,7 +38,6 @@ pub use rustc_type_ir::{Movability, Mutability};
 use std::fmt;
 use std::mem;
 use thin_vec::{thin_vec, ThinVec};
-
 /// A "Label" is an identifier of some point in sources,
 /// e.g. in the following code:
 ///
@@ -3144,30 +3143,31 @@ pub type ForeignItem = Item<ForeignItemKind>;
 mod size_asserts {
     use super::*;
     use rustc_data_structures::static_assert_size;
+    use std::alloc::{Allocator, Global};
     // tidy-alphabetical-start
     static_assert_size!(AssocItem, 88);
     static_assert_size!(AssocItemKind, 16);
     static_assert_size!(Attribute, 32);
-    static_assert_size!(Block, 32);
-    static_assert_size!(Expr, 72);
-    static_assert_size!(ExprKind, 40);
-    static_assert_size!(Fn, 152);
+    static_assert_size!(Block, 32 + mem::size_of::<<Global as Allocator>::CoAllocMeta>());
+    static_assert_size!(Expr, 72 + mem::size_of::<<Global as Allocator>::CoAllocMeta>());
+    static_assert_size!(ExprKind, 40 + mem::size_of::<<Global as Allocator>::CoAllocMeta>());
+    static_assert_size!(Fn, 152 + 2 * mem::size_of::<<Global as Allocator>::CoAllocMeta>());
     static_assert_size!(ForeignItem, 96);
     static_assert_size!(ForeignItemKind, 24);
     static_assert_size!(GenericArg, 24);
-    static_assert_size!(GenericBound, 56);
-    static_assert_size!(Generics, 40);
-    static_assert_size!(Impl, 136);
-    static_assert_size!(Item, 136);
-    static_assert_size!(ItemKind, 64);
+    static_assert_size!(GenericBound, 56 + mem::size_of::<<Global as Allocator>::CoAllocMeta>());
+    static_assert_size!(Generics, 40 + 2 * mem::size_of::<<Global as Allocator>::CoAllocMeta>());
+    static_assert_size!(Impl, 136 + 3 * mem::size_of::<<Global as Allocator>::CoAllocMeta>());
+    static_assert_size!(Item, 136 + 3 * mem::size_of::<<Global as Allocator>::CoAllocMeta>());
+    static_assert_size!(ItemKind, 64 + 3 * mem::size_of::<<Global as Allocator>::CoAllocMeta>());
     static_assert_size!(LitKind, 24);
     static_assert_size!(Local, 72);
     static_assert_size!(MetaItemLit, 40);
     static_assert_size!(Param, 40);
-    static_assert_size!(Pat, 72);
+    static_assert_size!(Pat, 72 + mem::size_of::<<Global as Allocator>::CoAllocMeta>());
     static_assert_size!(Path, 24);
     static_assert_size!(PathSegment, 24);
-    static_assert_size!(PatKind, 48);
+    static_assert_size!(PatKind, 48 + mem::size_of::<<Global as Allocator>::CoAllocMeta>());
     static_assert_size!(Stmt, 32);
     static_assert_size!(StmtKind, 16);
     static_assert_size!(Ty, 64);

compiler/rustc_ast/src/lib.rs

@@ -11,9 +11,11 @@
 #![cfg_attr(not(bootstrap), doc(rust_logo))]
 #![cfg_attr(not(bootstrap), allow(internal_features))]
 #![cfg_attr(not(bootstrap), feature(rustdoc_internals))]
+#![feature(allocator_api)]
 #![feature(associated_type_bounds)]
 #![feature(box_patterns)]
 #![feature(const_trait_impl)]
+#![feature(global_co_alloc_meta)]
 #![feature(if_let_guard)]
 #![feature(let_chains)]
 #![feature(min_specialization)]

compiler/rustc_hir_typeck/src/fn_ctxt/suggestions.rs

@@ -390,7 +390,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         return None; // do not suggest code that is already there (#53348)
                     }
 
-                    let method_call_list = [sym::to_vec, sym::to_string];
+                    let method_call_list = [sym::to_vec, sym::to_vec_co, sym::to_string];
                     let mut sugg = if let ExprKind::MethodCall(receiver_method, ..) = expr.kind
                         && receiver_method.ident.name == sym::clone
                         && method_call_list.contains(&conversion_method.name)

compiler/rustc_middle/src/lib.rs

@@ -35,6 +35,7 @@
 #![cfg_attr(bootstrap, feature(generators))]
 #![cfg_attr(not(bootstrap), feature(coroutines))]
 #![feature(get_mut_unchecked)]
+#![feature(global_co_alloc_meta)]
 #![feature(if_let_guard)]
 #![feature(inline_const)]
 #![feature(iter_from_coroutine)]

compiler/rustc_middle/src/mir/mod.rs

@@ -1629,7 +1629,10 @@ mod size_asserts {
     use super::*;
     use rustc_data_structures::static_assert_size;
     // tidy-alphabetical-start
-    static_assert_size!(BasicBlockData<'_>, 136);
+    static_assert_size!(
+        BasicBlockData<'_>,
+        136 + mem::size_of::<<std::alloc::Global as std::alloc::Allocator>::CoAllocMeta>()
+    );
     static_assert_size!(LocalDecl<'_>, 40);
     static_assert_size!(SourceScopeData<'_>, 72);
     static_assert_size!(Statement<'_>, 32);

compiler/rustc_middle/src/mir/syntax.rs

@@ -1442,6 +1442,9 @@ mod size_asserts {
     static_assert_size!(Operand<'_>, 24);
     static_assert_size!(Place<'_>, 16);
     static_assert_size!(PlaceElem<'_>, 24);
-    static_assert_size!(Rvalue<'_>, 40);
+    static_assert_size!(
+        Rvalue<'_>,
+        40 + std::mem::size_of::<<std::alloc::Global as std::alloc::Allocator>::CoAllocMeta>()
+    );
     // tidy-alphabetical-end
 }

compiler/rustc_parse/src/lib.rs

@@ -1,7 +1,9 @@
 //! The main parser interface.
 
+#![feature(allocator_api)]
 #![feature(array_windows)]
 #![feature(box_patterns)]
+#![feature(global_co_alloc_meta)]
 #![feature(if_let_guard)]
 #![feature(iter_intersperse)]
 #![feature(let_chains)]

compiler/rustc_parse/src/parser/attr_wrapper.rs

@@ -458,8 +458,12 @@ fn make_token_stream(
 mod size_asserts {
     use super::*;
     use rustc_data_structures::static_assert_size;
+    use std::alloc::{Allocator, Global};
     // tidy-alphabetical-start
     static_assert_size!(AttrWrapper, 16);
-    static_assert_size!(LazyAttrTokenStreamImpl, 104);
+    static_assert_size!(
+        LazyAttrTokenStreamImpl,
+        104 + std::mem::size_of::<<Global as Allocator>::CoAllocMeta>()
+    );
     // tidy-alphabetical-end
 }

compiler/rustc_parse/src/parser/mod.rs

@@ -179,7 +179,10 @@ pub struct Parser<'a> {
 // This type is used a lot, e.g. it's cloned when matching many declarative macro rules with nonterminals. Make sure
 // it doesn't unintentionally get bigger.
 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
-rustc_data_structures::static_assert_size!(Parser<'_>, 264);
+rustc_data_structures::static_assert_size!(
+    Parser<'_>,
+    264 + 4 * mem::size_of::<<std::alloc::Global as std::alloc::Allocator>::CoAllocMeta>()
+);
 
 /// Stores span information about a closure.
 #[derive(Clone)]