rustc_transmute: Directly use types from rustc_abi

Cargo.lock

@@ -4496,6 +4496,7 @@ name = "rustc_transmute"
 version = "0.0.0"
 dependencies = [
  "itertools",
+ "rustc_abi",
  "rustc_ast_ir",
  "rustc_data_structures",
  "rustc_hir",
@@ -4503,7 +4504,6 @@ dependencies = [
  "rustc_macros",
  "rustc_middle",
  "rustc_span",
- "rustc_target",
  "tracing",
 ]
 

compiler/rustc_transmute/Cargo.toml

@@ -5,6 +5,7 @@ edition = "2021"
 
 [dependencies]
 # tidy-alphabetical-start
+rustc_abi = { path = "../rustc_abi", optional = true }
 rustc_ast_ir = { path = "../rustc_ast_ir", optional = true }
 rustc_data_structures = { path = "../rustc_data_structures" }
 rustc_hir = { path = "../rustc_hir", optional = true }
@@ -12,19 +13,18 @@ rustc_infer = { path = "../rustc_infer", optional = true }
 rustc_macros = { path = "../rustc_macros", optional = true }
 rustc_middle = { path = "../rustc_middle", optional = true }
 rustc_span = { path = "../rustc_span", optional = true }
-rustc_target = { path = "../rustc_target", optional = true }
 tracing = "0.1"
 # tidy-alphabetical-end
 
 [features]
 rustc = [
+    "dep:rustc_abi",
+    "dep:rustc_ast_ir",
     "dep:rustc_hir",
     "dep:rustc_infer",
     "dep:rustc_macros",
     "dep:rustc_middle",
     "dep:rustc_span",
-    "dep:rustc_target",
-    "dep:rustc_ast_ir",
 ]
 
 [dev-dependencies]

compiler/rustc_transmute/src/layout/mod.rs

@@ -62,10 +62,10 @@ fn is_mutable(&self) -> bool {
 pub mod rustc {
     use std::fmt::{self, Write};
 
+    use rustc_abi::Layout;
     use rustc_middle::mir::Mutability;
     use rustc_middle::ty::layout::{HasTyCtxt, LayoutCx, LayoutError};
     use rustc_middle::ty::{self, Ty};
-    use rustc_target::abi::Layout;
 
     /// A reference in the layout.
     #[derive(Debug, Hash, Eq, PartialEq, Clone, Copy)]

compiler/rustc_transmute/src/layout/tree.rs

@@ -171,12 +171,12 @@ pub(crate) fn or(self, other: Self) -> Self {
 
 #[cfg(feature = "rustc")]
 pub(crate) mod rustc {
+    use rustc_abi::{
+        FieldIdx, FieldsShape, Layout, Size, TagEncoding, TyAndLayout, VariantIdx, Variants,
+    };
     use rustc_middle::ty::layout::{HasTyCtxt, LayoutCx, LayoutError};
     use rustc_middle::ty::{self, AdtDef, AdtKind, List, ScalarInt, Ty, TyCtxt, TypeVisitableExt};
     use rustc_span::ErrorGuaranteed;
-    use rustc_target::abi::{
-        FieldIdx, FieldsShape, Layout, Size, TagEncoding, TyAndLayout, VariantIdx, Variants,
-    };
 
     use super::Tree;
     use crate::layout::rustc::{Def, Ref, layout_of};
@@ -206,7 +206,7 @@ fn from(err: &LayoutError<'tcx>) -> Self {
 
     impl<'tcx> Tree<Def<'tcx>, Ref<'tcx>> {
         pub(crate) fn from_ty(ty: Ty<'tcx>, cx: LayoutCx<'tcx>) -> Result<Self, Err> {
-            use rustc_target::abi::HasDataLayout;
+            use rustc_abi::HasDataLayout;
             let layout = layout_of(cx, ty)?;
 
             if let Err(e) = ty.error_reported() {
@@ -446,7 +446,7 @@ fn from_variant(
 
         /// Constructs a `Tree` representing the value of a enum tag.
         fn from_tag(tag: ScalarInt, tcx: TyCtxt<'tcx>) -> Self {
-            use rustc_target::abi::Endian;
+            use rustc_abi::Endian;
             let size = tag.size();
             let bits = tag.to_bits(size);
             let bytes: [u8; 16];