compiler: Remove power alignment lint

This lint was based on a false premise: LLVM lacks a correct datalayout,
but rustc assumed that the AIX datalayout was correct.

Author: workingjubilee

compiler/rustc_lint/messages.ftl

@@ -1017,7 +1017,5 @@ lint_useless_ptr_null_checks_fn_ret = returned pointer of `{$fn_name}` call is n
 lint_useless_ptr_null_checks_ref = references are not nullable, so checking them for null will always return false
     .label = expression has type `{$orig_ty}`
 
-lint_uses_power_alignment = repr(C) does not follow the power alignment rule. This may affect platform C ABI compatibility for this type
-
 lint_variant_size_differences =
     enum variant is more than three times larger ({$largest} bytes) than the next largest

compiler/rustc_lint/src/lints.rs

@@ -1741,10 +1741,6 @@ pub(crate) struct OverflowingLiteral<'a> {
     pub lit: String,
 }
 
-#[derive(LintDiagnostic)]
-#[diag(lint_uses_power_alignment)]
-pub(crate) struct UsesPowerAlignment;
-
 #[derive(LintDiagnostic)]
 #[diag(lint_unused_comparisons)]
 pub(crate) struct UnusedComparisons;

compiler/rustc_lint/src/types.rs

@@ -1,15 +1,15 @@
 use std::iter;
 use std::ops::ControlFlow;
 
-use rustc_abi::{BackendRepr, TagEncoding, VariantIdx, Variants, WrappingRange};
+use rustc_abi::{BackendRepr, TagEncoding, Variants, WrappingRange};
 use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::DiagMessage;
 use rustc_hir::intravisit::VisitorExt;
 use rustc_hir::{AmbigArg, Expr, ExprKind, HirId, LangItem};
 use rustc_middle::bug;
 use rustc_middle::ty::layout::{LayoutOf, SizeSkeleton};
 use rustc_middle::ty::{
-    self, Adt, AdtKind, GenericArgsRef, Ty, TyCtxt, TypeSuperVisitable, TypeVisitable,
+    self, AdtKind, GenericArgsRef, Ty, TyCtxt, TypeSuperVisitable, TypeVisitable,
     TypeVisitableExt,
 };
 use rustc_session::{declare_lint, declare_lint_pass, impl_lint_pass};
@@ -26,7 +26,7 @@ use crate::lints::{
     AmbiguousWidePointerComparisonsExpectSuggestion, AtomicOrderingFence, AtomicOrderingLoad,
     AtomicOrderingStore, ImproperCTypes, InvalidAtomicOrderingDiag, InvalidNanComparisons,
     InvalidNanComparisonsSuggestion, UnpredictableFunctionPointerComparisons,
-    UnpredictableFunctionPointerComparisonsSuggestion, UnusedComparisons, UsesPowerAlignment,
+    UnpredictableFunctionPointerComparisonsSuggestion, UnusedComparisons,
     VariantSizeDifferencesDiag,
 };
 use crate::{LateContext, LateLintPass, LintContext, fluent_generated as fluent};
@@ -752,62 +752,7 @@ declare_lint! {
     "proper use of libc types in foreign item definitions"
 }
 
-declare_lint! {
-    /// The `uses_power_alignment` lint detects specific `repr(C)`
-    /// aggregates on AIX.
-    /// In its platform C ABI, AIX uses the "power" (as in PowerPC) alignment
-    /// rule (detailed in https://www.ibm.com/docs/en/xl-c-and-cpp-aix/16.1?topic=data-using-alignment-modes#alignment),
-    /// which can also be set for XLC by `#pragma align(power)` or
-    /// `-qalign=power`. Aggregates with a floating-point type as the
-    /// recursively first field (as in "at offset 0") modify the layout of
-    /// *subsequent* fields of the associated structs to use an alignment value
-    /// where the floating-point type is aligned on a 4-byte boundary.
-    ///
-    /// Effectively, subsequent floating-point fields act as-if they are `repr(packed(4))`. This
-    /// would be unsound to do in a `repr(C)` type without all the restrictions that come with
-    /// `repr(packed)`. Rust instead chooses a layout that maintains soundness of Rust code, at the
-    /// expense of incompatibility with C code.
-    ///
-    /// ### Example
-    ///
-    /// ```rust,ignore (fails on non-powerpc64-ibm-aix)
-    /// #[repr(C)]
-    /// pub struct Floats {
-    ///     a: f64,
-    ///     b: u8,
-    ///     c: f64,
-    /// }
-    /// ```
-    ///
-    /// This will produce:
-    ///
-    /// ```text
-    /// warning: repr(C) does not follow the power alignment rule. This may affect platform C ABI compatibility for this type
-    ///  --> <source>:5:3
-    ///   |
-    /// 5 |   c: f64,
-    ///   |   ^^^^^^
-    ///   |
-    ///   = note: `#[warn(uses_power_alignment)]` on by default
-    /// ```
-    ///
-    /// ### Explanation
-    ///
-    /// The power alignment rule specifies that the above struct has the
-    /// following alignment:
-    ///  - offset_of!(Floats, a) == 0
-    ///  - offset_of!(Floats, b) == 8
-    ///  - offset_of!(Floats, c) == 12
-    ///
-    /// However, Rust currently aligns `c` at `offset_of!(Floats, c) == 16`.
-    /// Using offset 12 would be unsound since `f64` generally must be 8-aligned on this target.
-    /// Thus, a warning is produced for the above struct.
-    USES_POWER_ALIGNMENT,
-    Warn,
-    "Structs do not follow the power alignment rule under repr(C)"
-}
-
-declare_lint_pass!(ImproperCTypesDefinitions => [IMPROPER_CTYPES_DEFINITIONS, USES_POWER_ALIGNMENT]);
+declare_lint_pass!(ImproperCTypesDefinitions => [IMPROPER_CTYPES_DEFINITIONS]);
 
 #[derive(Clone, Copy)]
 pub(crate) enum CItemKind {
@@ -1647,68 +1592,6 @@ impl ImproperCTypesDefinitions {
             vis.check_type_for_ffi_and_report_errors(span, fn_ptr_ty, true, false);
         }
     }
-
-    fn check_arg_for_power_alignment<'tcx>(
-        &mut self,
-        cx: &LateContext<'tcx>,
-        ty: Ty<'tcx>,
-    ) -> bool {
-        assert!(cx.tcx.sess.target.os == "aix");
-        // Structs (under repr(C)) follow the power alignment rule if:
-        //   - the first field of the struct is a floating-point type that
-        //     is greater than 4-bytes, or
-        //   - the first field of the struct is an aggregate whose
-        //     recursively first field is a floating-point type greater than
-        //     4 bytes.
-        if ty.is_floating_point() && ty.primitive_size(cx.tcx).bytes() > 4 {
-            return true;
-        } else if let Adt(adt_def, _) = ty.kind()
-            && adt_def.is_struct()
-            && adt_def.repr().c()
-            && !adt_def.repr().packed()
-            && adt_def.repr().align.is_none()
-        {
-            let struct_variant = adt_def.variant(VariantIdx::ZERO);
-            // Within a nested struct, all fields are examined to correctly
-            // report if any fields after the nested struct within the
-            // original struct are misaligned.
-            for struct_field in &struct_variant.fields {
-                let field_ty = cx.tcx.type_of(struct_field.did).instantiate_identity();
-                if self.check_arg_for_power_alignment(cx, field_ty) {
-                    return true;
-                }
-            }
-        }
-        return false;
-    }
-
-    fn check_struct_for_power_alignment<'tcx>(
-        &mut self,
-        cx: &LateContext<'tcx>,
-        item: &'tcx hir::Item<'tcx>,
-    ) {
-        let adt_def = cx.tcx.adt_def(item.owner_id.to_def_id());
-        // repr(C) structs also with packed or aligned representation
-        // should be ignored.
-        if adt_def.repr().c()
-            && !adt_def.repr().packed()
-            && adt_def.repr().align.is_none()
-            && cx.tcx.sess.target.os == "aix"
-            && !adt_def.all_fields().next().is_none()
-        {
-            let struct_variant_data = item.expect_struct().2;
-            for field_def in struct_variant_data.fields().iter().skip(1) {
-                // Struct fields (after the first field) are checked for the
-                // power alignment rule, as fields after the first are likely
-                // to be the fields that are misaligned.
-                let def_id = field_def.def_id;
-                let ty = cx.tcx.type_of(def_id).instantiate_identity();
-                if self.check_arg_for_power_alignment(cx, ty) {
-                    cx.emit_span_lint(USES_POWER_ALIGNMENT, field_def.span, UsesPowerAlignment);
-                }
-            }
-        }
-    }
 }
 
 /// `ImproperCTypesDefinitions` checks items outside of foreign items (e.g. stuff that isn't in
@@ -1732,11 +1615,7 @@ impl<'tcx> LateLintPass<'tcx> for ImproperCTypesDefinitions {
             }
             // See `check_fn`..
             hir::ItemKind::Fn { .. } => {}
-            // Structs are checked based on if they follow the power alignment
-            // rule (under repr(C)).
-            hir::ItemKind::Struct(..) => {
-                self.check_struct_for_power_alignment(cx, item);
-            }
+            hir::ItemKind::Struct(..) => {}
             // See `check_field_def`..
             hir::ItemKind::Union(..) | hir::ItemKind::Enum(..) => {}
             // Doesn't define something that can contain a external type to be checked.