use std::borrow::Cow;
use std::fmt::Write;

use either::Either;
use rustc_abi::WrappingRange;
use rustc_errors::codes::*;
use rustc_errors::{
    Diag, DiagArgValue, DiagMessage, Diagnostic, EmissionGuarantee, Level, MultiSpan, Subdiagnostic,
};
use rustc_hir::ConstContext;
use rustc_macros::{Diagnostic, LintDiagnostic, Subdiagnostic};
use rustc_middle::mir::interpret::{
    CtfeProvenance, ExpectedKind, InterpErrorKind, InvalidMetaKind, InvalidProgramInfo,
    Misalignment, Pointer, PointerKind, ResourceExhaustionInfo, UndefinedBehaviorInfo,
    UnsupportedOpInfo, ValidationErrorInfo,
};
use rustc_middle::ty::{self, Mutability, Ty};
use rustc_span::{Span, Symbol};

use crate::fluent_generated as fluent;
use crate::interpret::InternKind;

#[derive(Diagnostic)]
#[diag(const_eval_dangling_ptr_in_final)]
pub(crate) struct DanglingPtrInFinal {
    #[primary_span]
    pub span: Span,
    pub kind: InternKind,
}

#[derive(Diagnostic)]
#[diag(const_eval_nested_static_in_thread_local)]
pub(crate) struct NestedStaticInThreadLocal {
    #[primary_span]
    pub span: Span,
}

#[derive(Diagnostic)]
#[diag(const_eval_mutable_ptr_in_final)]
pub(crate) struct MutablePtrInFinal {
    #[primary_span]
    pub span: Span,
    pub kind: InternKind,
}

#[derive(Diagnostic)]
#[diag(const_eval_const_heap_ptr_in_final)]
#[note]
pub(crate) struct ConstHeapPtrInFinal {
    #[primary_span]
    pub span: Span,
}

#[derive(Diagnostic)]
#[diag(const_eval_partial_pointer_in_final)]
#[note]
pub(crate) struct PartialPtrInFinal {
    #[primary_span]
    pub span: Span,
    pub kind: InternKind,
}

#[derive(Diagnostic)]
#[diag(const_eval_unstable_in_stable_exposed)]
pub(crate) struct UnstableInStableExposed {
    pub gate: String,
    #[primary_span]
    pub span: Span,
    #[help(const_eval_is_function_call)]
    pub is_function_call: bool,
    /// Need to duplicate the field so that fluent also provides it as a variable...
    pub is_function_call2: bool,
    #[suggestion(
        const_eval_unstable_sugg,
        code = "#[rustc_const_unstable(feature = \"...\", issue = \"...\")]\n",
        applicability = "has-placeholders"
    )]
    pub attr_span: Span,
}

#[derive(Diagnostic)]
#[diag(const_eval_thread_local_access, code = E0625)]
pub(crate) struct ThreadLocalAccessErr {
    #[primary_span]
    pub span: Span,
}

#[derive(Diagnostic)]
#[diag(const_eval_raw_ptr_to_int)]
#[note]
#[note(const_eval_note2)]
pub(crate) struct RawPtrToIntErr {
    #[primary_span]
    pub span: Span,
}

#[derive(Diagnostic)]
#[diag(const_eval_raw_ptr_comparison)]
#[note]
pub(crate) struct RawPtrComparisonErr {
    #[primary_span]
    pub span: Span,
}

#[derive(Diagnostic)]
#[diag(const_eval_panic_non_str)]
pub(crate) struct PanicNonStrErr {
    #[primary_span]
    pub span: Span,
}

#[derive(Diagnostic)]
#[diag(const_eval_unallowed_fn_pointer_call)]
pub(crate) struct UnallowedFnPointerCall {
    #[primary_span]
    pub span: Span,
    pub kind: ConstContext,
}

#[derive(Diagnostic)]
#[diag(const_eval_unstable_const_fn)]
pub(crate) struct UnstableConstFn {
    #[primary_span]
    pub span: Span,
    pub def_path: String,
}

#[derive(Diagnostic)]
#[diag(const_eval_unstable_const_trait)]
pub(crate) struct UnstableConstTrait {
    #[primary_span]
    pub span: Span,
    pub def_path: String,
}

#[derive(Diagnostic)]
#[diag(const_eval_unstable_intrinsic)]
pub(crate) struct UnstableIntrinsic {
    #[primary_span]
    pub span: Span,
    pub name: Symbol,
    pub feature: Symbol,
    #[suggestion(
        const_eval_unstable_intrinsic_suggestion,
        code = "#![feature({feature})]\n",
        applicability = "machine-applicable"
    )]
    pub suggestion: Span,
}

#[derive(Diagnostic)]
#[diag(const_eval_unmarked_const_item_exposed)]
#[help]
pub(crate) struct UnmarkedConstItemExposed {
    #[primary_span]
    pub span: Span,
    pub def_path: String,
}

#[derive(Diagnostic)]
#[diag(const_eval_unmarked_intrinsic_exposed)]
#[help]
pub(crate) struct UnmarkedIntrinsicExposed {
    #[primary_span]
    pub span: Span,
    pub def_path: String,
}

#[derive(Diagnostic)]
#[diag(const_eval_mutable_borrow_escaping, code = E0764)]
#[note]
#[note(const_eval_note2)]
#[help]
pub(crate) struct MutableBorrowEscaping {
    #[primary_span]
    #[label]
    pub span: Span,
    pub kind: ConstContext,
}

#[derive(Diagnostic)]
#[diag(const_eval_non_const_fmt_macro_call, code = E0015)]
pub(crate) struct NonConstFmtMacroCall {
    #[primary_span]
    pub span: Span,
    pub kind: ConstContext,
    pub non_or_conditionally: &'static str,
}

#[derive(Diagnostic)]
#[diag(const_eval_non_const_fn_call, code = E0015)]
pub(crate) struct NonConstFnCall {
    #[primary_span]
    pub span: Span,
    pub def_path_str: String,
    pub def_descr: &'static str,
    pub kind: ConstContext,
    pub non_or_conditionally: &'static str,
}

#[derive(Diagnostic)]
#[diag(const_eval_non_const_intrinsic)]
pub(crate) struct NonConstIntrinsic {
    #[primary_span]
    pub span: Span,
    pub name: Symbol,
    pub kind: ConstContext,
}

#[derive(Diagnostic)]
#[diag(const_eval_unallowed_op_in_const_context)]
pub(crate) struct UnallowedOpInConstContext {
    #[primary_span]
    pub span: Span,
    pub msg: String,
}

#[derive(Diagnostic)]
#[diag(const_eval_unallowed_heap_allocations, code = E0010)]
pub(crate) struct UnallowedHeapAllocations {
    #[primary_span]
    #[label]
    pub span: Span,
    pub kind: ConstContext,
    #[note(const_eval_teach_note)]
    pub teach: bool,
}

#[derive(Diagnostic)]
#[diag(const_eval_unallowed_inline_asm, code = E0015)]
pub(crate) struct UnallowedInlineAsm {
    #[primary_span]
    pub span: Span,
    pub kind: ConstContext,
}

#[derive(Diagnostic)]
#[diag(const_eval_interior_mutable_borrow_escaping, code = E0492)]
#[note]
#[note(const_eval_note2)]
#[help]
pub(crate) struct InteriorMutableBorrowEscaping {
    #[primary_span]
    #[label]
    pub span: Span,
    pub kind: ConstContext,
}

#[derive(LintDiagnostic)]
#[diag(const_eval_long_running)]
#[note]
pub struct LongRunning {
    #[help]
    pub item_span: Span,
}

#[derive(Diagnostic)]
#[diag(const_eval_long_running)]
pub struct LongRunningWarn {
    #[primary_span]
    #[label]
    pub span: Span,
    #[help]
    pub item_span: Span,
    // Used for evading `-Z deduplicate-diagnostics`.
    pub force_duplicate: usize,
}

#[derive(Subdiagnostic)]
#[note(const_eval_non_const_impl)]
pub(crate) struct NonConstImplNote {
    #[primary_span]
    pub span: Span,
}

#[derive(Clone)]
pub struct FrameNote {
    pub span: Span,
    pub times: i32,
    pub where_: &'static str,
    pub instance: String,
    pub has_label: bool,
}

impl Subdiagnostic for FrameNote {
    fn add_to_diag<G: EmissionGuarantee>(self, diag: &mut Diag<'_, G>) {
        diag.arg("times", self.times);
        diag.arg("where_", self.where_);
        diag.arg("instance", self.instance);
        let mut span: MultiSpan = self.span.into();
        if self.has_label && !self.span.is_dummy() {
            span.push_span_label(self.span, fluent::const_eval_frame_note_last);
        }
        let msg = diag.eagerly_translate(fluent::const_eval_frame_note);
        diag.remove_arg("times");
        diag.remove_arg("where_");
        diag.remove_arg("instance");
        diag.span_note(span, msg);
    }
}

#[derive(Subdiagnostic)]
#[note(const_eval_raw_bytes)]
pub struct RawBytesNote {
    pub size: u64,
    pub align: u64,
    pub bytes: String,
}

// FIXME(fee1-dead) do not use stringly typed `ConstContext`

#[derive(Diagnostic)]
#[diag(const_eval_non_const_match_eq, code = E0015)]
#[note]
pub struct NonConstMatchEq<'tcx> {
    #[primary_span]
    pub span: Span,
    pub ty: Ty<'tcx>,
    pub kind: ConstContext,
    pub non_or_conditionally: &'static str,
}

#[derive(Diagnostic)]
#[diag(const_eval_non_const_for_loop_into_iter, code = E0015)]
pub struct NonConstForLoopIntoIter<'tcx> {
    #[primary_span]
    pub span: Span,
    pub ty: Ty<'tcx>,
    pub kind: ConstContext,
    pub non_or_conditionally: &'static str,
}

#[derive(Diagnostic)]
#[diag(const_eval_non_const_question_branch, code = E0015)]
pub struct NonConstQuestionBranch<'tcx> {
    #[primary_span]
    pub span: Span,
    pub ty: Ty<'tcx>,
    pub kind: ConstContext,
    pub non_or_conditionally: &'static str,
}

#[derive(Diagnostic)]
#[diag(const_eval_non_const_question_from_residual, code = E0015)]
pub struct NonConstQuestionFromResidual<'tcx> {
    #[primary_span]
    pub span: Span,
    pub ty: Ty<'tcx>,
    pub kind: ConstContext,
    pub non_or_conditionally: &'static str,
}

#[derive(Diagnostic)]
#[diag(const_eval_non_const_try_block_from_output, code = E0015)]
pub struct NonConstTryBlockFromOutput<'tcx> {
    #[primary_span]
    pub span: Span,
    pub ty: Ty<'tcx>,
    pub kind: ConstContext,
    pub non_or_conditionally: &'static str,
}

#[derive(Diagnostic)]
#[diag(const_eval_non_const_await, code = E0015)]
pub struct NonConstAwait<'tcx> {
    #[primary_span]
    pub span: Span,
    pub ty: Ty<'tcx>,
    pub kind: ConstContext,
    pub non_or_conditionally: &'static str,
}

#[derive(Diagnostic)]
#[diag(const_eval_non_const_closure, code = E0015)]
pub struct NonConstClosure {
    #[primary_span]
    pub span: Span,
    pub kind: ConstContext,
    #[subdiagnostic]
    pub note: Option<NonConstClosureNote>,
    pub non_or_conditionally: &'static str,
}

#[derive(Subdiagnostic)]
pub enum NonConstClosureNote {
    #[note(const_eval_closure_fndef_not_const)]
    FnDef {
        #[primary_span]
        span: Span,
    },
    #[note(const_eval_fn_ptr_call)]
    FnPtr,
    #[note(const_eval_closure_call)]
    Closure,
}

#[derive(Subdiagnostic)]
#[multipart_suggestion(const_eval_consider_dereferencing, applicability = "machine-applicable")]
pub struct ConsiderDereferencing {
    pub deref: String,
    #[suggestion_part(code = "{deref}")]
    pub span: Span,
    #[suggestion_part(code = "{deref}")]
    pub rhs_span: Span,
}

#[derive(Diagnostic)]
#[diag(const_eval_non_const_operator, code = E0015)]
pub struct NonConstOperator {
    #[primary_span]
    pub span: Span,
    pub kind: ConstContext,
    #[subdiagnostic]
    pub sugg: Option<ConsiderDereferencing>,
    pub non_or_conditionally: &'static str,
}

#[derive(Diagnostic)]
#[diag(const_eval_non_const_deref_coercion, code = E0015)]
#[note]
pub struct NonConstDerefCoercion<'tcx> {
    #[primary_span]
    pub span: Span,
    pub ty: Ty<'tcx>,
    pub kind: ConstContext,
    pub target_ty: Ty<'tcx>,
    #[note(const_eval_target_note)]
    pub deref_target: Option<Span>,
    pub non_or_conditionally: &'static str,
}

#[derive(Diagnostic)]
#[diag(const_eval_live_drop, code = E0493)]
pub struct LiveDrop<'tcx> {
    #[primary_span]
    #[label]
    pub span: Span,
    pub kind: ConstContext,
    pub dropped_ty: Ty<'tcx>,
    #[label(const_eval_dropped_at_label)]
    pub dropped_at: Span,
}

pub trait ReportErrorExt {
    /// Returns the diagnostic message for this error.
    fn diagnostic_message(&self) -> DiagMessage;
    fn add_args<G: EmissionGuarantee>(self, diag: &mut Diag<'_, G>);

    fn debug(self) -> String
    where
        Self: Sized,
    {
        ty::tls::with(move |tcx| {
            let dcx = tcx.dcx();
            let mut diag = dcx.struct_allow(DiagMessage::Str(String::new().into()));
            let message = self.diagnostic_message();
            self.add_args(&mut diag);
            let s = dcx.eagerly_translate_to_string(message, diag.args.iter());
            diag.cancel();
            s
        })
    }
}

impl<'a> ReportErrorExt for UndefinedBehaviorInfo<'a> {
    fn diagnostic_message(&self) -> DiagMessage {
        use UndefinedBehaviorInfo::*;

        use crate::fluent_generated::*;
        match self {
            Ub(msg) => msg.clone().into(),
            Custom(x) => (x.msg)(),
            ValidationError(e) => e.diagnostic_message(),

            Unreachable => const_eval_unreachable,
            BoundsCheckFailed { .. } => const_eval_bounds_check_failed,
            DivisionByZero => const_eval_division_by_zero,
            RemainderByZero => const_eval_remainder_by_zero,
            DivisionOverflow => const_eval_division_overflow,
            RemainderOverflow => const_eval_remainder_overflow,
            PointerArithOverflow => const_eval_pointer_arithmetic_overflow,
            ArithOverflow { .. } => const_eval_overflow_arith,
            ShiftOverflow { .. } => const_eval_overflow_shift,
            InvalidMeta(InvalidMetaKind::SliceTooBig) => const_eval_invalid_meta_slice,
            InvalidMeta(InvalidMetaKind::TooBig) => const_eval_invalid_meta,
            UnterminatedCString(_) => const_eval_unterminated_c_string,
            PointerUseAfterFree(_, _) => const_eval_pointer_use_after_free,
            PointerOutOfBounds { .. } => const_eval_pointer_out_of_bounds,
            DanglingIntPointer { addr: 0, .. } => const_eval_dangling_null_pointer,
            DanglingIntPointer { .. } => const_eval_dangling_int_pointer,
            AlignmentCheckFailed { .. } => const_eval_alignment_check_failed,
            WriteToReadOnly(_) => const_eval_write_to_read_only,
            DerefFunctionPointer(_) => const_eval_deref_function_pointer,
            DerefVTablePointer(_) => const_eval_deref_vtable_pointer,
            DerefTypeIdPointer(_) => const_eval_deref_typeid_pointer,
            InvalidBool(_) => const_eval_invalid_bool,
            InvalidChar(_) => const_eval_invalid_char,
            InvalidTag(_) => const_eval_invalid_tag,
            InvalidFunctionPointer(_) => const_eval_invalid_function_pointer,
            InvalidVTablePointer(_) => const_eval_invalid_vtable_pointer,
            InvalidVTableTrait { .. } => const_eval_invalid_vtable_trait,
            InvalidStr(_) => const_eval_invalid_str,
            InvalidUninitBytes(None) => const_eval_invalid_uninit_bytes_unknown,
            InvalidUninitBytes(Some(_)) => const_eval_invalid_uninit_bytes,
            DeadLocal => const_eval_dead_local,
            ScalarSizeMismatch(_) => const_eval_scalar_size_mismatch,
            UninhabitedEnumVariantWritten(_) => const_eval_uninhabited_enum_variant_written,
            UninhabitedEnumVariantRead(_) => const_eval_uninhabited_enum_variant_read,
            InvalidNichedEnumVariantWritten { .. } => {
                const_eval_invalid_niched_enum_variant_written
            }
            AbiMismatchArgument { .. } => const_eval_incompatible_arg_types,
            AbiMismatchReturn { .. } => const_eval_incompatible_return_types,
        }
    }

    fn add_args<G: EmissionGuarantee>(self, diag: &mut Diag<'_, G>) {
        use UndefinedBehaviorInfo::*;
        match self {
            Ub(_) => {}
            Custom(custom) => {
                (custom.add_args)(&mut |name, value| {
                    diag.arg(name, value);
                });
            }
            ValidationError(e) => e.add_args(diag),

            Unreachable
            | DivisionByZero
            | RemainderByZero
            | DivisionOverflow
            | RemainderOverflow
            | PointerArithOverflow
            | InvalidMeta(InvalidMetaKind::SliceTooBig)
            | InvalidMeta(InvalidMetaKind::TooBig)
            | InvalidUninitBytes(None)
            | DeadLocal
            | UninhabitedEnumVariantWritten(_)
            | UninhabitedEnumVariantRead(_) => {}

            ArithOverflow { intrinsic } => {
                diag.arg("intrinsic", intrinsic);
            }
            ShiftOverflow { intrinsic, shift_amount } => {
                diag.arg("intrinsic", intrinsic);
                diag.arg(
                    "shift_amount",
                    match shift_amount {
                        Either::Left(v) => v.to_string(),
                        Either::Right(v) => v.to_string(),
                    },
                );
            }
            BoundsCheckFailed { len, index } => {
                diag.arg("len", len);
                diag.arg("index", index);
            }
            UnterminatedCString(ptr) | InvalidFunctionPointer(ptr) | InvalidVTablePointer(ptr) => {
                diag.arg("pointer", ptr);
            }
            InvalidVTableTrait { expected_dyn_type, vtable_dyn_type } => {
                diag.arg("expected_dyn_type", expected_dyn_type.to_string());
                diag.arg("vtable_dyn_type", vtable_dyn_type.to_string());
            }
            PointerUseAfterFree(alloc_id, msg) => {
                diag.arg("alloc_id", alloc_id).arg("operation", format!("{:?}", msg));
            }
            PointerOutOfBounds { alloc_id, alloc_size, ptr_offset, inbounds_size, msg } => {
                diag.arg("alloc_size", alloc_size.bytes());
                diag.arg("pointer", {
                    let mut out = format!("{:?}", alloc_id);
                    if ptr_offset > 0 {
                        write!(out, "+{:#x}", ptr_offset).unwrap();
                    } else if ptr_offset < 0 {
                        write!(out, "-{:#x}", ptr_offset.unsigned_abs()).unwrap();
                    }
                    out
                });
                diag.arg("inbounds_size", inbounds_size);
                diag.arg("inbounds_size_is_neg", inbounds_size < 0);
                diag.arg("inbounds_size_abs", inbounds_size.unsigned_abs());
                diag.arg("ptr_offset", ptr_offset);
                diag.arg("ptr_offset_is_neg", ptr_offset < 0);
                diag.arg("ptr_offset_abs", ptr_offset.unsigned_abs());
                diag.arg(
                    "alloc_size_minus_ptr_offset",
                    alloc_size.bytes().saturating_sub(ptr_offset as u64),
                );
                diag.arg("operation", format!("{:?}", msg));
            }
            DanglingIntPointer { addr, inbounds_size, msg } => {
                if addr != 0 {
                    diag.arg(
                        "pointer",
                        Pointer::<Option<CtfeProvenance>>::without_provenance(addr).to_string(),
                    );
                }

                diag.arg("inbounds_size", inbounds_size);
                diag.arg("inbounds_size_is_neg", inbounds_size < 0);
                diag.arg("inbounds_size_abs", inbounds_size.unsigned_abs());
                diag.arg("operation", format!("{:?}", msg));
            }
            AlignmentCheckFailed(Misalignment { required, has }, msg) => {
                diag.arg("required", required.bytes());
                diag.arg("has", has.bytes());
                diag.arg("msg", format!("{msg:?}"));
            }
            WriteToReadOnly(alloc)
            | DerefFunctionPointer(alloc)
            | DerefVTablePointer(alloc)
            | DerefTypeIdPointer(alloc) => {
                diag.arg("allocation", alloc);
            }
            InvalidBool(b) => {
                diag.arg("value", format!("{b:02x}"));
            }
            InvalidChar(c) => {
                diag.arg("value", format!("{c:08x}"));
            }
            InvalidTag(tag) => {
                diag.arg("tag", format!("{tag:x}"));
            }
            InvalidStr(err) => {
                diag.arg("err", format!("{err}"));
            }
            InvalidUninitBytes(Some((alloc, info))) => {
                diag.arg("alloc", alloc);
                diag.arg("access", info.access);
                diag.arg("uninit", info.bad);
            }
            ScalarSizeMismatch(info) => {
                diag.arg("target_size", info.target_size);
                diag.arg("data_size", info.data_size);
            }
            InvalidNichedEnumVariantWritten { enum_ty } => {
                diag.arg("ty", enum_ty);
            }
            AbiMismatchArgument { arg_idx, caller_ty, callee_ty } => {
                diag.arg("arg_idx", arg_idx + 1); // adjust for 1-indexed lists in output
                diag.arg("caller_ty", caller_ty);
                diag.arg("callee_ty", callee_ty);
            }
            AbiMismatchReturn { caller_ty, callee_ty } => {
                diag.arg("caller_ty", caller_ty);
                diag.arg("callee_ty", callee_ty);
            }
        }
    }
}

impl<'tcx> ReportErrorExt for ValidationErrorInfo<'tcx> {
    fn diagnostic_message(&self) -> DiagMessage {
        use rustc_middle::mir::interpret::ValidationErrorKind::*;

        use crate::fluent_generated::*;
        match self.kind {
            PtrToUninhabited { ptr_kind: PointerKind::Box, .. } => {
                const_eval_validation_box_to_uninhabited
            }
            PtrToUninhabited { ptr_kind: PointerKind::Ref(_), .. } => {
                const_eval_validation_ref_to_uninhabited
            }

            PointerAsInt { .. } => const_eval_validation_pointer_as_int,
            PartialPointer => const_eval_validation_partial_pointer,
            MutableRefToImmutable => const_eval_validation_mutable_ref_to_immutable,
            MutableRefInConst => const_eval_validation_mutable_ref_in_const,
            NullFnPtr => const_eval_validation_null_fn_ptr,
            NeverVal => const_eval_validation_never_val,
            NonnullPtrMaybeNull { .. } => const_eval_validation_nonnull_ptr_out_of_range,
            PtrOutOfRange { .. } => const_eval_validation_ptr_out_of_range,
            OutOfRange { .. } => const_eval_validation_out_of_range,
            UnsafeCellInImmutable => const_eval_validation_unsafe_cell,
            UninhabitedVal { .. } => const_eval_validation_uninhabited_val,
            InvalidEnumTag { .. } => const_eval_validation_invalid_enum_tag,
            UninhabitedEnumVariant => const_eval_validation_uninhabited_enum_variant,
            Uninit { .. } => const_eval_validation_uninit,
            InvalidVTablePtr { .. } => const_eval_validation_invalid_vtable_ptr,
            InvalidMetaWrongTrait { .. } => const_eval_validation_invalid_vtable_trait,
            InvalidMetaSliceTooLarge { ptr_kind: PointerKind::Box } => {
                const_eval_validation_invalid_box_slice_meta
            }
            InvalidMetaSliceTooLarge { ptr_kind: PointerKind::Ref(_) } => {
                const_eval_validation_invalid_ref_slice_meta
            }

            InvalidMetaTooLarge { ptr_kind: PointerKind::Box } => {
                const_eval_validation_invalid_box_meta
            }
            InvalidMetaTooLarge { ptr_kind: PointerKind::Ref(_) } => {
                const_eval_validation_invalid_ref_meta
            }
            UnalignedPtr { ptr_kind: PointerKind::Ref(_), .. } => {
                const_eval_validation_unaligned_ref
            }
            UnalignedPtr { ptr_kind: PointerKind::Box, .. } => const_eval_validation_unaligned_box,

            NullPtr { ptr_kind: PointerKind::Box, .. } => const_eval_validation_null_box,
            NullPtr { ptr_kind: PointerKind::Ref(_), .. } => const_eval_validation_null_ref,
            DanglingPtrNoProvenance { ptr_kind: PointerKind::Box, .. } => {
                const_eval_validation_dangling_box_no_provenance
            }
            DanglingPtrNoProvenance { ptr_kind: PointerKind::Ref(_), .. } => {
                const_eval_validation_dangling_ref_no_provenance
            }
            DanglingPtrOutOfBounds { ptr_kind: PointerKind::Box } => {
                const_eval_validation_dangling_box_out_of_bounds
            }
            DanglingPtrOutOfBounds { ptr_kind: PointerKind::Ref(_) } => {
                const_eval_validation_dangling_ref_out_of_bounds
            }
            DanglingPtrUseAfterFree { ptr_kind: PointerKind::Box } => {
                const_eval_validation_dangling_box_use_after_free
            }
            DanglingPtrUseAfterFree { ptr_kind: PointerKind::Ref(_) } => {
                const_eval_validation_dangling_ref_use_after_free
            }
            InvalidBool { .. } => const_eval_validation_invalid_bool,
            InvalidChar { .. } => const_eval_validation_invalid_char,
            InvalidFnPtr { .. } => const_eval_validation_invalid_fn_ptr,
        }
    }

    fn add_args<G: EmissionGuarantee>(self, err: &mut Diag<'_, G>) {
        use rustc_middle::mir::interpret::ValidationErrorKind::*;

        use crate::fluent_generated as fluent;

        if let PointerAsInt { .. } | PartialPointer = self.kind {
            err.help(fluent::const_eval_ptr_as_bytes_1);
            err.help(fluent::const_eval_ptr_as_bytes_2);
        }

        let message = if let Some(path) = self.path {
            err.dcx.eagerly_translate_to_string(
                fluent::const_eval_validation_front_matter_invalid_value_with_path,
                [("path".into(), DiagArgValue::Str(path.into()))].iter().map(|(a, b)| (a, b)),
            )
        } else {
            err.dcx.eagerly_translate_to_string(
                fluent::const_eval_validation_front_matter_invalid_value,
                [].into_iter(),
            )
        };

        err.arg("front_matter", message);

        fn add_range_arg<G: EmissionGuarantee>(
            r: WrappingRange,
            max_hi: u128,
            err: &mut Diag<'_, G>,
        ) {
            let WrappingRange { start: lo, end: hi } = r;
            assert!(hi <= max_hi);
            let msg = if lo > hi {
                fluent::const_eval_range_wrapping
            } else if lo == hi {
                fluent::const_eval_range_singular
            } else if lo == 0 {
                assert!(hi < max_hi, "should not be printing if the range covers everything");
                fluent::const_eval_range_upper
            } else if hi == max_hi {
                assert!(lo > 0, "should not be printing if the range covers everything");
                fluent::const_eval_range_lower
            } else {
                fluent::const_eval_range
            };

            let args = [
                ("lo".into(), DiagArgValue::Str(lo.to_string().into())),
                ("hi".into(), DiagArgValue::Str(hi.to_string().into())),
            ];
            let args = args.iter().map(|(a, b)| (a, b));
            let message = err.dcx.eagerly_translate_to_string(msg, args);
            err.arg("in_range", message);
        }

        match self.kind {
            PtrToUninhabited { ty, .. } | UninhabitedVal { ty } => {
                err.arg("ty", ty);
            }
            PointerAsInt { expected } | Uninit { expected } => {
                let msg = match expected {
                    ExpectedKind::Reference => fluent::const_eval_validation_expected_ref,
                    ExpectedKind::Box => fluent::const_eval_validation_expected_box,
                    ExpectedKind::RawPtr => fluent::const_eval_validation_expected_raw_ptr,
                    ExpectedKind::InitScalar => fluent::const_eval_validation_expected_init_scalar,
                    ExpectedKind::Bool => fluent::const_eval_validation_expected_bool,
                    ExpectedKind::Char => fluent::const_eval_validation_expected_char,
                    ExpectedKind::Float => fluent::const_eval_validation_expected_float,
                    ExpectedKind::Int => fluent::const_eval_validation_expected_int,
                    ExpectedKind::FnPtr => fluent::const_eval_validation_expected_fn_ptr,
                    ExpectedKind::EnumTag => fluent::const_eval_validation_expected_enum_tag,
                    ExpectedKind::Str => fluent::const_eval_validation_expected_str,
                };
                let msg = err.dcx.eagerly_translate_to_string(msg, [].into_iter());
                err.arg("expected", msg);
            }
            InvalidEnumTag { value }
            | InvalidVTablePtr { value }
            | InvalidBool { value }
            | InvalidChar { value }
            | InvalidFnPtr { value } => {
                err.arg("value", value);
            }
            PtrOutOfRange { range, max_value } => add_range_arg(range, max_value, err),
            OutOfRange { range, max_value, value } => {
                err.arg("value", value);
                add_range_arg(range, max_value, err);
            }
            UnalignedPtr { required_bytes, found_bytes, .. } => {
                err.arg("required_bytes", required_bytes);
                err.arg("found_bytes", found_bytes);
            }
            DanglingPtrNoProvenance { pointer, .. } => {
                err.arg("pointer", pointer);
            }
            InvalidMetaWrongTrait { vtable_dyn_type, expected_dyn_type } => {
                err.arg("vtable_dyn_type", vtable_dyn_type.to_string());
                err.arg("expected_dyn_type", expected_dyn_type.to_string());
            }
            NullPtr { maybe, .. } => {
                err.arg("maybe", maybe);
            }
            MutableRefToImmutable
            | MutableRefInConst
            | NullFnPtr
            | NonnullPtrMaybeNull
            | NeverVal
            | UnsafeCellInImmutable
            | InvalidMetaSliceTooLarge { .. }
            | InvalidMetaTooLarge { .. }
            | DanglingPtrUseAfterFree { .. }
            | DanglingPtrOutOfBounds { .. }
            | UninhabitedEnumVariant
            | PartialPointer => {}
        }
    }
}

impl ReportErrorExt for UnsupportedOpInfo {
    fn diagnostic_message(&self) -> DiagMessage {
        use crate::fluent_generated::*;
        match self {
            UnsupportedOpInfo::Unsupported(s) => s.clone().into(),
            UnsupportedOpInfo::ExternTypeField => const_eval_extern_type_field,
            UnsupportedOpInfo::UnsizedLocal => const_eval_unsized_local,
            UnsupportedOpInfo::ReadPartialPointer(_) => const_eval_partial_pointer_read,
            UnsupportedOpInfo::ReadPointerAsInt(_) => const_eval_read_pointer_as_int,
            UnsupportedOpInfo::ThreadLocalStatic(_) => const_eval_thread_local_static,
            UnsupportedOpInfo::ExternStatic(_) => const_eval_extern_static,
        }
    }

    fn add_args<G: EmissionGuarantee>(self, diag: &mut Diag<'_, G>) {
        use UnsupportedOpInfo::*;

        use crate::fluent_generated::*;
        if let ReadPointerAsInt(_) | ReadPartialPointer(_) = self {
            diag.help(const_eval_ptr_as_bytes_1);
            diag.help(const_eval_ptr_as_bytes_2);
        }
        match self {
            // `ReadPointerAsInt(Some(info))` is never printed anyway, it only serves as an error to
            // be further processed by validity checking which then turns it into something nice to
            // print. So it's not worth the effort of having diagnostics that can print the `info`.
            UnsizedLocal
            | UnsupportedOpInfo::ExternTypeField
            | Unsupported(_)
            | ReadPointerAsInt(_) => {}
            ReadPartialPointer(ptr) => {
                diag.arg("ptr", ptr);
            }
            ThreadLocalStatic(did) | ExternStatic(did) => rustc_middle::ty::tls::with(|tcx| {
                diag.arg("did", tcx.def_path_str(did));
            }),
        }
    }
}

impl<'tcx> ReportErrorExt for InterpErrorKind<'tcx> {
    fn diagnostic_message(&self) -> DiagMessage {
        match self {
            InterpErrorKind::UndefinedBehavior(ub) => ub.diagnostic_message(),
            InterpErrorKind::Unsupported(e) => e.diagnostic_message(),
            InterpErrorKind::InvalidProgram(e) => e.diagnostic_message(),
            InterpErrorKind::ResourceExhaustion(e) => e.diagnostic_message(),
            InterpErrorKind::MachineStop(e) => e.diagnostic_message(),
        }
    }
    fn add_args<G: EmissionGuarantee>(self, diag: &mut Diag<'_, G>) {
        match self {
            InterpErrorKind::UndefinedBehavior(ub) => ub.add_args(diag),
            InterpErrorKind::Unsupported(e) => e.add_args(diag),
            InterpErrorKind::InvalidProgram(e) => e.add_args(diag),
            InterpErrorKind::ResourceExhaustion(e) => e.add_args(diag),
            InterpErrorKind::MachineStop(e) => e.add_args(&mut |name, value| {
                diag.arg(name, value);
            }),
        }
    }
}

impl<'tcx> ReportErrorExt for InvalidProgramInfo<'tcx> {
    fn diagnostic_message(&self) -> DiagMessage {
        use crate::fluent_generated::*;
        match self {
            InvalidProgramInfo::TooGeneric => const_eval_too_generic,
            InvalidProgramInfo::AlreadyReported(_) => const_eval_already_reported,
            InvalidProgramInfo::Layout(e) => e.diagnostic_message(),
        }
    }
    fn add_args<G: EmissionGuarantee>(self, diag: &mut Diag<'_, G>) {
        match self {
            InvalidProgramInfo::TooGeneric | InvalidProgramInfo::AlreadyReported(_) => {}
            InvalidProgramInfo::Layout(e) => {
                // The level doesn't matter, `dummy_diag` is consumed without it being used.
                let dummy_level = Level::Bug;
                let dummy_diag: Diag<'_, ()> = e.into_diagnostic().into_diag(diag.dcx, dummy_level);
                for (name, val) in dummy_diag.args.iter() {
                    diag.arg(name.clone(), val.clone());
                }
                dummy_diag.cancel();
            }
        }
    }
}

impl ReportErrorExt for ResourceExhaustionInfo {
    fn diagnostic_message(&self) -> DiagMessage {
        use crate::fluent_generated::*;
        match self {
            ResourceExhaustionInfo::StackFrameLimitReached => const_eval_stack_frame_limit_reached,
            ResourceExhaustionInfo::MemoryExhausted => const_eval_memory_exhausted,
            ResourceExhaustionInfo::AddressSpaceFull => const_eval_address_space_full,
            ResourceExhaustionInfo::Interrupted => const_eval_interrupted,
        }
    }
    fn add_args<G: EmissionGuarantee>(self, _: &mut Diag<'_, G>) {}
}

impl rustc_errors::IntoDiagArg for InternKind {
    fn into_diag_arg(self, _: &mut Option<std::path::PathBuf>) -> DiagArgValue {
        DiagArgValue::Str(Cow::Borrowed(match self {
            InternKind::Static(Mutability::Not) => "static",
            InternKind::Static(Mutability::Mut) => "static_mut",
            InternKind::Constant => "const",
            InternKind::Promoted => "promoted",
        }))
    }
}