compiler: make rustc_target have less weird reexports

rustc_target has had a lot of weird reexports for various reasons, but
now we're at a point where we can actually start reducing their number.
We remove weird shadowing-dependent behavior and import directly from
rustc_abi instead of doing weird renaming imports.

This is only incremental progress and does not entirely fix the crate.

compiler/rustc_target/src/asm/mod.rs

@@ -1,11 +1,11 @@
 use std::fmt;
 use std::str::FromStr;
 
+use rustc_abi::Size;
 use rustc_data_structures::fx::{FxHashMap, FxIndexSet};
 use rustc_macros::{Decodable, Encodable, HashStable_Generic};
 use rustc_span::Symbol;
 
-use crate::abi::Size;
 use crate::spec::{RelocModel, Target};
 
 pub struct ModifierInfo {

compiler/rustc_target/src/callconv/aarch64.rs

@@ -1,9 +1,8 @@
 use std::iter;
 
-use rustc_abi::{BackendRepr, Primitive};
+use rustc_abi::{BackendRepr, HasDataLayout, Primitive, TyAbiInterface};
 
 use crate::abi::call::{ArgAbi, FnAbi, Reg, RegKind, Uniform};
-use crate::abi::{HasDataLayout, TyAbiInterface};
 use crate::spec::{HasTargetSpec, Target};
 
 /// Indicates the variant of the AArch64 ABI we are compiling for.

compiler/rustc_target/src/callconv/amdgpu.rs

@@ -1,5 +1,6 @@
+use rustc_abi::{HasDataLayout, TyAbiInterface};
+
 use crate::abi::call::{ArgAbi, FnAbi};
-use crate::abi::{HasDataLayout, TyAbiInterface};
 
 fn classify_ret<'a, Ty, C>(_cx: &C, ret: &mut ArgAbi<'a, Ty>)
 where

compiler/rustc_target/src/callconv/arm.rs

@@ -1,5 +1,6 @@
+use rustc_abi::{HasDataLayout, TyAbiInterface};
+
 use crate::abi::call::{ArgAbi, Conv, FnAbi, Reg, RegKind, Uniform};
-use crate::abi::{HasDataLayout, TyAbiInterface};
 use crate::spec::HasTargetSpec;
 
 fn is_homogeneous_aggregate<'a, Ty, C>(cx: &C, arg: &mut ArgAbi<'a, Ty>) -> Option<Uniform>

compiler/rustc_target/src/callconv/loongarch.rs

@@ -1,9 +1,10 @@
-use crate::abi::call::{ArgAbi, ArgExtension, CastTarget, FnAbi, PassMode, Reg, RegKind, Uniform};
-use crate::abi::{
-    self, BackendRepr, FieldsShape, HasDataLayout, Size, TyAbiInterface, TyAndLayout,
+use rustc_abi::{
+    BackendRepr, ExternAbi, FieldsShape, HasDataLayout, Primitive, Reg, RegKind, Size,
+    TyAbiInterface, TyAndLayout, Variants,
 };
+
+use crate::callconv::{ArgAbi, ArgExtension, CastTarget, FnAbi, PassMode, Uniform};
 use crate::spec::HasTargetSpec;
-use crate::spec::abi::Abi as SpecAbi;
 
 #[derive(Copy, Clone)]
 enum RegPassKind {
@@ -42,7 +43,7 @@ where
 {
     match arg_layout.backend_repr {
         BackendRepr::Scalar(scalar) => match scalar.primitive() {
-            abi::Int(..) | abi::Pointer(_) => {
+            Primitive::Int(..) | Primitive::Pointer(_) => {
                 if arg_layout.size.bits() > xlen {
                     return Err(CannotUseFpConv);
                 }
@@ -62,7 +63,7 @@ where
                     _ => return Err(CannotUseFpConv),
                 }
             }
-            abi::Float(_) => {
+            Primitive::Float(_) => {
                 if arg_layout.size.bits() > flen {
                     return Err(CannotUseFpConv);
                 }
@@ -115,8 +116,8 @@ where
             }
             FieldsShape::Arbitrary { .. } => {
                 match arg_layout.variants {
-                    abi::Variants::Multiple { .. } => return Err(CannotUseFpConv),
-                    abi::Variants::Single { .. } | abi::Variants::Empty => (),
+                    Variants::Multiple { .. } => return Err(CannotUseFpConv),
+                    Variants::Single { .. } | Variants::Empty => (),
                 }
                 for i in arg_layout.fields.index_by_increasing_offset() {
                     let field = arg_layout.field(cx, i);
@@ -314,7 +315,7 @@ fn classify_arg<'a, Ty, C>(
 
 fn extend_integer_width<Ty>(arg: &mut ArgAbi<'_, Ty>, xlen: u64) {
     if let BackendRepr::Scalar(scalar) = arg.layout.backend_repr {
-        if let abi::Int(i, _) = scalar.primitive() {
+        if let Primitive::Int(i, _) = scalar.primitive() {
             // 32-bit integers are always sign-extended
             if i.size().bits() == 32 && xlen > 32 {
                 if let PassMode::Direct(ref mut attrs) = arg.mode {
@@ -363,12 +364,12 @@ where
     }
 }
 
-pub(crate) fn compute_rust_abi_info<'a, Ty, C>(cx: &C, fn_abi: &mut FnAbi<'a, Ty>, abi: SpecAbi)
+pub(crate) fn compute_rust_abi_info<'a, Ty, C>(cx: &C, fn_abi: &mut FnAbi<'a, Ty>, abi: ExternAbi)
 where
     Ty: TyAbiInterface<'a, C> + Copy,
     C: HasDataLayout + HasTargetSpec,
 {
-    if abi == SpecAbi::RustIntrinsic {
+    if abi == ExternAbi::RustIntrinsic {
         return;
     }
 

compiler/rustc_target/src/callconv/mips.rs

@@ -1,5 +1,6 @@
+use rustc_abi::{HasDataLayout, Size};
+
 use crate::abi::call::{ArgAbi, FnAbi, Reg, Uniform};
-use crate::abi::{HasDataLayout, Size};
 
 fn classify_ret<Ty, C>(cx: &C, ret: &mut ArgAbi<'_, Ty>, offset: &mut Size)
 where

compiler/rustc_target/src/callconv/mips64.rs

@@ -1,12 +1,15 @@
-use crate::abi::call::{
-    ArgAbi, ArgAttribute, ArgAttributes, ArgExtension, CastTarget, FnAbi, PassMode, Reg, Uniform,
+use rustc_abi::{
+    BackendRepr, FieldsShape, Float, HasDataLayout, Primitive, Reg, Size, TyAbiInterface,
+};
+
+use crate::callconv::{
+    ArgAbi, ArgAttribute, ArgAttributes, ArgExtension, CastTarget, FnAbi, PassMode, Uniform,
 };
-use crate::abi::{self, HasDataLayout, Size, TyAbiInterface};
 
 fn extend_integer_width_mips<Ty>(arg: &mut ArgAbi<'_, Ty>, bits: u64) {
     // Always sign extend u32 values on 64-bit mips
-    if let abi::BackendRepr::Scalar(scalar) = arg.layout.backend_repr {
-        if let abi::Int(i, signed) = scalar.primitive() {
+    if let BackendRepr::Scalar(scalar) = arg.layout.backend_repr {
+        if let Primitive::Int(i, signed) = scalar.primitive() {
             if !signed && i.size().bits() == 32 {
                 if let PassMode::Direct(ref mut attrs) = arg.mode {
                     attrs.ext(ArgExtension::Sext);
@@ -25,9 +28,9 @@ where
     C: HasDataLayout,
 {
     match ret.layout.field(cx, i).backend_repr {
-        abi::BackendRepr::Scalar(scalar) => match scalar.primitive() {
-            abi::Float(abi::F32) => Some(Reg::f32()),
-            abi::Float(abi::F64) => Some(Reg::f64()),
+        BackendRepr::Scalar(scalar) => match scalar.primitive() {
+            Primitive::Float(Float::F32) => Some(Reg::f32()),
+            Primitive::Float(Float::F64) => Some(Reg::f64()),
             _ => None,
         },
         _ => None,
@@ -51,7 +54,7 @@ where
         // use of float registers to structures (not unions) containing exactly one or two
         // float fields.
 
-        if let abi::FieldsShape::Arbitrary { .. } = ret.layout.fields {
+        if let FieldsShape::Arbitrary { .. } = ret.layout.fields {
             if ret.layout.fields.count() == 1 {
                 if let Some(reg) = float_reg(cx, ret, 0) {
                     ret.cast_to(reg);
@@ -90,16 +93,16 @@ where
     let mut prefix_index = 0;
 
     match arg.layout.fields {
-        abi::FieldsShape::Primitive => unreachable!(),
-        abi::FieldsShape::Array { .. } => {
+        FieldsShape::Primitive => unreachable!(),
+        FieldsShape::Array { .. } => {
             // Arrays are passed indirectly
             arg.make_indirect();
             return;
         }
-        abi::FieldsShape::Union(_) => {
+        FieldsShape::Union(_) => {
             // Unions and are always treated as a series of 64-bit integer chunks
         }
-        abi::FieldsShape::Arbitrary { .. } => {
+        FieldsShape::Arbitrary { .. } => {
             // Structures are split up into a series of 64-bit integer chunks, but any aligned
             // doubles not part of another aggregate are passed as floats.
             let mut last_offset = Size::ZERO;
@@ -109,8 +112,8 @@ where
                 let offset = arg.layout.fields.offset(i);
 
                 // We only care about aligned doubles
-                if let abi::BackendRepr::Scalar(scalar) = field.backend_repr {
-                    if scalar.primitive() == abi::Float(abi::F64) {
+                if let BackendRepr::Scalar(scalar) = field.backend_repr {
+                    if scalar.primitive() == Primitive::Float(Float::F64) {
                         if offset.is_aligned(dl.f64_align.abi) {
                             // Insert enough integers to cover [last_offset, offset)
                             assert!(last_offset.is_aligned(dl.f64_align.abi));

compiler/rustc_target/src/callconv/mod.rs

@@ -1,14 +1,14 @@
 use std::str::FromStr;
 use std::{fmt, iter};
 
-pub use rustc_abi::{ExternAbi, Reg, RegKind};
+use rustc_abi::{
+    AddressSpace, Align, BackendRepr, ExternAbi, HasDataLayout, Scalar, Size, TyAbiInterface,
+    TyAndLayout,
+};
+pub use rustc_abi::{Primitive, Reg, RegKind};
 use rustc_macros::HashStable_Generic;
 use rustc_span::Symbol;
 
-use crate::abi::{
-    self, AddressSpace, Align, BackendRepr, HasDataLayout, Pointer, Size, TyAbiInterface,
-    TyAndLayout,
-};
 use crate::spec::{HasTargetSpec, HasWasmCAbiOpt, HasX86AbiOpt, WasmCAbi};
 
 mod aarch64;
@@ -349,7 +349,7 @@ impl<'a, Ty> ArgAbi<'a, Ty> {
     pub fn new(
         cx: &impl HasDataLayout,
         layout: TyAndLayout<'a, Ty>,
-        scalar_attrs: impl Fn(&TyAndLayout<'a, Ty>, abi::Scalar, Size) -> ArgAttributes,
+        scalar_attrs: impl Fn(&TyAndLayout<'a, Ty>, Scalar, Size) -> ArgAttributes,
     ) -> Self {
         let mode = match layout.backend_repr {
             BackendRepr::Uninhabited => PassMode::Ignore,
@@ -464,7 +464,7 @@ impl<'a, Ty> ArgAbi<'a, Ty> {
     pub fn extend_integer_width_to(&mut self, bits: u64) {
         // Only integers have signedness
         if let BackendRepr::Scalar(scalar) = self.layout.backend_repr {
-            if let abi::Int(i, signed) = scalar.primitive() {
+            if let Primitive::Int(i, signed) = scalar.primitive() {
                 if i.size().bits() < bits {
                     if let PassMode::Direct(ref mut attrs) = self.mode {
                         if signed {
@@ -756,7 +756,9 @@ impl<'a, Ty> FnAbi<'a, Ty> {
                 continue;
             }
 
-            if arg_idx.is_none() && arg.layout.size > Pointer(AddressSpace::DATA).size(cx) * 2 {
+            if arg_idx.is_none()
+                && arg.layout.size > Primitive::Pointer(AddressSpace::DATA).size(cx) * 2
+            {
                 // Return values larger than 2 registers using a return area
                 // pointer. LLVM and Cranelift disagree about how to return
                 // values that don't fit in the registers designated for return
@@ -837,7 +839,7 @@ impl<'a, Ty> FnAbi<'a, Ty> {
             assert!(is_indirect_not_on_stack);
 
             let size = arg.layout.size;
-            if !arg.layout.is_unsized() && size <= Pointer(AddressSpace::DATA).size(cx) {
+            if !arg.layout.is_unsized() && size <= Primitive::Pointer(AddressSpace::DATA).size(cx) {
                 // We want to pass small aggregates as immediates, but using
                 // an LLVM aggregate type for this leads to bad optimizations,
                 // so we pick an appropriately sized integer type instead.

compiler/rustc_target/src/callconv/nvptx64.rs

@@ -1,6 +1,7 @@
+use rustc_abi::{HasDataLayout, Reg, Size, TyAbiInterface};
+
 use super::{ArgAttribute, ArgAttributes, ArgExtension, CastTarget};
-use crate::abi::call::{ArgAbi, FnAbi, Reg, Size, Uniform};
-use crate::abi::{HasDataLayout, TyAbiInterface};
+use crate::abi::call::{ArgAbi, FnAbi, Uniform};
 
 fn classify_ret<Ty>(ret: &mut ArgAbi<'_, Ty>) {
     if ret.layout.is_aggregate() && ret.layout.is_sized() {

compiler/rustc_target/src/callconv/powerpc64.rs

@@ -2,8 +2,9 @@
 // Alignment of 128 bit types is not currently handled, this will
 // need to be fixed when PowerPC vector support is added.
 
+use rustc_abi::{Endian, HasDataLayout, TyAbiInterface};
+
 use crate::abi::call::{Align, ArgAbi, FnAbi, Reg, RegKind, Uniform};
-use crate::abi::{Endian, HasDataLayout, TyAbiInterface};
 use crate::spec::HasTargetSpec;
 
 #[derive(Debug, Clone, Copy, PartialEq)]

compiler/rustc_target/src/callconv/riscv.rs

@@ -4,12 +4,13 @@
 // Reference: Clang RISC-V ELF psABI lowering code
 // https://github.com/llvm/llvm-project/blob/8e780252a7284be45cf1ba224cabd884847e8e92/clang/lib/CodeGen/TargetInfo.cpp#L9311-L9773
 
-use rustc_abi::{BackendRepr, FieldsShape, HasDataLayout, Size, TyAbiInterface, TyAndLayout};
+use rustc_abi::{
+    BackendRepr, ExternAbi, FieldsShape, HasDataLayout, Primitive, Reg, RegKind, Size,
+    TyAbiInterface, TyAndLayout, Variants,
+};
 
-use crate::abi;
-use crate::abi::call::{ArgAbi, ArgExtension, CastTarget, FnAbi, PassMode, Reg, RegKind, Uniform};
+use crate::abi::call::{ArgAbi, ArgExtension, CastTarget, FnAbi, PassMode, Uniform};
 use crate::spec::HasTargetSpec;
-use crate::spec::abi::Abi as SpecAbi;
 
 #[derive(Copy, Clone)]
 enum RegPassKind {
@@ -48,7 +49,7 @@ where
 {
     match arg_layout.backend_repr {
         BackendRepr::Scalar(scalar) => match scalar.primitive() {
-            abi::Int(..) | abi::Pointer(_) => {
+            Primitive::Int(..) | Primitive::Pointer(_) => {
                 if arg_layout.size.bits() > xlen {
                     return Err(CannotUseFpConv);
                 }
@@ -68,7 +69,7 @@ where
                     _ => return Err(CannotUseFpConv),
                 }
             }
-            abi::Float(_) => {
+            Primitive::Float(_) => {
                 if arg_layout.size.bits() > flen {
                     return Err(CannotUseFpConv);
                 }
@@ -121,8 +122,8 @@ where
             }
             FieldsShape::Arbitrary { .. } => {
                 match arg_layout.variants {
-                    abi::Variants::Multiple { .. } => return Err(CannotUseFpConv),
-                    abi::Variants::Single { .. } | abi::Variants::Empty => (),
+                    Variants::Multiple { .. } => return Err(CannotUseFpConv),
+                    Variants::Single { .. } | Variants::Empty => (),
                 }
                 for i in arg_layout.fields.index_by_increasing_offset() {
                     let field = arg_layout.field(cx, i);
@@ -320,7 +321,7 @@ fn classify_arg<'a, Ty, C>(
 
 fn extend_integer_width<Ty>(arg: &mut ArgAbi<'_, Ty>, xlen: u64) {
     if let BackendRepr::Scalar(scalar) = arg.layout.backend_repr {
-        if let abi::Int(i, _) = scalar.primitive() {
+        if let Primitive::Int(i, _) = scalar.primitive() {
             // 32-bit integers are always sign-extended
             if i.size().bits() == 32 && xlen > 32 {
                 if let PassMode::Direct(ref mut attrs) = arg.mode {
@@ -369,12 +370,12 @@ where
     }
 }
 
-pub(crate) fn compute_rust_abi_info<'a, Ty, C>(cx: &C, fn_abi: &mut FnAbi<'a, Ty>, abi: SpecAbi)
+pub(crate) fn compute_rust_abi_info<'a, Ty, C>(cx: &C, fn_abi: &mut FnAbi<'a, Ty>, abi: ExternAbi)
 where
     Ty: TyAbiInterface<'a, C> + Copy,
     C: HasDataLayout + HasTargetSpec,
 {
-    if abi == SpecAbi::RustIntrinsic {
+    if abi == ExternAbi::RustIntrinsic {
         return;
     }
 

compiler/rustc_target/src/callconv/s390x.rs

@@ -1,8 +1,9 @@
 // Reference: ELF Application Binary Interface s390x Supplement
 // https://github.com/IBM/s390x-abi
 
+use rustc_abi::{BackendRepr, HasDataLayout, TyAbiInterface};
+
 use crate::abi::call::{ArgAbi, FnAbi, Reg, RegKind};
-use crate::abi::{BackendRepr, HasDataLayout, TyAbiInterface};
 use crate::spec::HasTargetSpec;
 
 fn classify_ret<Ty>(ret: &mut ArgAbi<'_, Ty>) {

compiler/rustc_target/src/callconv/sparc.rs

@@ -1,5 +1,6 @@
+use rustc_abi::{HasDataLayout, Size};
+
 use crate::abi::call::{ArgAbi, FnAbi, Reg, Uniform};
-use crate::abi::{HasDataLayout, Size};
 
 fn classify_ret<Ty, C>(cx: &C, ret: &mut ArgAbi<'_, Ty>, offset: &mut Size)
 where