compiler: Lift rustc_target::spec::abi::Abi to rustc_abi::ExternAbi

Cargo.lock

@@ -3204,9 +3204,11 @@ dependencies = [
  "rand",
  "rand_xoshiro",
  "rustc_data_structures",
+ "rustc_feature",
  "rustc_index",
  "rustc_macros",
  "rustc_serialize",
+ "rustc_span",
  "tracing",
 ]
 

compiler/rustc_abi/Cargo.toml

@@ -9,9 +9,11 @@ bitflags = "2.4.1"
 rand = { version = "0.8.4", default-features = false, optional = true }
 rand_xoshiro = { version = "0.6.0", optional = true }
 rustc_data_structures = { path = "../rustc_data_structures", optional = true  }
+rustc_feature = { path = "../rustc_feature", optional = true }
 rustc_index = { path = "../rustc_index", default-features = false }
 rustc_macros = { path = "../rustc_macros", optional = true }
 rustc_serialize = { path = "../rustc_serialize", optional = true  }
+rustc_span = { path = "../rustc_span", optional = true }
 tracing = "0.1"
 # tidy-alphabetical-end
 
@@ -22,8 +24,10 @@ default = ["nightly", "randomize"]
 # without depending on rustc_data_structures, rustc_macros and rustc_serialize
 nightly = [
     "dep:rustc_data_structures",
+    "dep:rustc_feature",
     "dep:rustc_macros",
     "dep:rustc_serialize",
+    "dep:rustc_span",
     "rustc_index/nightly",
 ]
 randomize = ["dep:rand", "dep:rand_xoshiro", "nightly"]

compiler/rustc_abi/src/extern_abi/mod.rs

@@ -7,9 +7,11 @@ use rustc_span::{Span, Symbol};
 #[cfg(test)]
 mod tests;
 
+use ExternAbi as Abi;
+
 #[derive(PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy, Debug)]
 #[derive(HashStable_Generic, Encodable, Decodable)]
-pub enum Abi {
+pub enum ExternAbi {
     // Some of the ABIs come first because every time we add a new ABI, we have to re-bless all the
     // hashing tests. These are used in many places, so giving them stable values reduces test
     // churn. The specific values are meaningless.

compiler/rustc_abi/src/lib.rs

@@ -1,6 +1,7 @@
 // tidy-alphabetical-start
 #![cfg_attr(feature = "nightly", allow(internal_features))]
 #![cfg_attr(feature = "nightly", doc(rust_logo))]
+#![cfg_attr(feature = "nightly", feature(assert_matches))]
 #![cfg_attr(feature = "nightly", feature(rustc_attrs))]
 #![cfg_attr(feature = "nightly", feature(rustdoc_internals))]
 #![cfg_attr(feature = "nightly", feature(step_trait))]
@@ -28,8 +29,15 @@ mod layout;
 #[cfg(test)]
 mod tests;
 
+#[cfg(feature = "nightly")]
+mod extern_abi;
+
 pub use callconv::{Heterogeneous, HomogeneousAggregate, Reg, RegKind};
 #[cfg(feature = "nightly")]
+pub use extern_abi::{
+    AbiDisabled, AbiUnsupported, ExternAbi, all_names, enabled_names, is_enabled, is_stable, lookup,
+};
+#[cfg(feature = "nightly")]
 pub use layout::{FIRST_VARIANT, FieldIdx, Layout, TyAbiInterface, TyAndLayout, VariantIdx};
 pub use layout::{LayoutCalculator, LayoutCalculatorError};
 

compiler/rustc_target/src/spec/mod.rs

@@ -55,9 +55,15 @@ use crate::json::{Json, ToJson};
 use crate::spec::abi::Abi;
 use crate::spec::crt_objects::CrtObjects;
 
-pub mod abi;
 pub mod crt_objects;
 
+pub mod abi {
+    pub use rustc_abi::{
+        AbiDisabled, AbiUnsupported, ExternAbi as Abi, all_names, enabled_names, is_enabled,
+        is_stable, lookup,
+    };
+}
+
 mod base;
 pub use base::apple::{
     deployment_target_for_target as current_apple_deployment_target,