charon_driver/translate/
translate_crate.rs

1//! This file governs the overall translation of items.
2//!
3//! Translation works as follows: we translate each `TransItemSource` of interest into an
4//! appropriate item. In the process of translating an item we may find more `hax::DefId`s of
5//! interest; we register those as an appropriate `TransItemSource`, which will 1/ enqueue the item
6//! so that it eventually gets translated too, and 2/ return an `ItemId` we can use to refer to
7//! it.
8//!
9//! We start with the DefId of the current crate (or of anything passed to `--start-from`) and
10//! recursively translate everything we find.
11//!
12//! There's another important component at play: opacity. Each item is assigned an opacity based on
13//! its name. By default, items from the local crate are transparent and items from foreign crates
14//! are opaque (this can be controlled with `--include`, `--opaque` and `--exclude`). If an item is
15//! opaque, its signature/"outer shell" will be translated (e.g. for functions that's the
16//! signature) but not its contents.
17use rustc_middle::ty::TyCtxt;
18use std::cell::RefCell;
19use std::path::PathBuf;
20
21use super::translate_ctx::*;
22use charon_lib::ast::*;
23use charon_lib::options::{CliOpts, TranslateOptions};
24use charon_lib::transform::TransformCtx;
25use hax::SInto;
26use macros::VariantIndexArity;
27
28/// The id of an untranslated item. Note that a given `DefId` may show up as multiple different
29/// item sources, e.g. a constant will have both a `Global` version (for the constant itself) and a
30/// `FunDecl` one (for its initializer function).
31#[derive(Clone, Debug, PartialEq, Eq, Hash)]
32pub struct TransItemSource {
33    pub item: RustcItem,
34    pub kind: TransItemSourceKind,
35}
36
37/// Refers to a rustc item. Can be either the polymorphic version of the item, or a
38/// monomorphization of it.
39#[derive(Clone, Debug, PartialEq, Eq, Hash)]
40pub enum RustcItem {
41    Poly(hax::DefId),
42    Mono(hax::ItemRef),
43}
44
45/// The kind of a [`TransItemSource`].
46#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, VariantIndexArity)]
47pub enum TransItemSourceKind {
48    Global,
49    TraitDecl,
50    TraitImpl(TraitImplSource),
51    Fun,
52    Type,
53    /// We don't translate these as proper items, but we translate them a bit in names.
54    InherentImpl,
55    /// We don't translate these as proper items, but we use them to explore the crate.
56    Module,
57    /// A trait impl method that uses the default method body from the trait declaration. The
58    /// `DefId` is that of the trait impl.
59    DefaultedMethod(TraitImplSource, TraitItemName),
60    /// The `call_*` method of the appropriate `TraitImplSource::Closure` impl.
61    ClosureMethod(ClosureKind),
62    /// A cast of a state-less closure as a function pointer.
63    ClosureAsFnCast,
64    /// The `drop_in_place` method of a `Destruct` impl or decl. It contains the drop glue that
65    /// calls `Drop::drop` for the type and then drops its fields. if the `TraitImplSource` is
66    /// `None` this is the method declaration (and the DefId is that of the `Destruct` trait),
67    /// otherwise this is a method implementation (and the DefId is that of the ADT or closure for
68    /// which to generate the drop glue).
69    DropInPlaceMethod(Option<TraitImplSource>),
70    /// The virtual table struct definition for a trait. The `DefId` is that of the trait.
71    VTable,
72    /// The static vtable value for a specific impl.
73    VTableInstance(TraitImplSource),
74    /// The initializer function of the `VTableInstance`.
75    VTableInstanceInitializer(TraitImplSource),
76    /// Shim function to store a method in a vtable; give a method with `self: Ptr<Self>` argument,
77    /// this takes a `Ptr<dyn Trait>` and forwards to the method. The `DefId` refers to the method
78    /// implementation.
79    VTableMethod,
80    /// The drop shim function to be used in the vtable as a field, the ID is an `impl`.
81    VTableDropShim,
82}
83
84/// The kind of a [`TransItemSourceKind::TraitImpl`].
85#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, VariantIndexArity)]
86pub enum TraitImplSource {
87    /// A user-written trait impl with a `DefId`.
88    Normal,
89    /// The blanket impl we generate for a trait alias. The `DefId` is that of the trait alias.
90    TraitAlias,
91    /// An impl of the appropriate `Fn*` trait for a closure. The `DefId` is that of the closure.
92    Closure(ClosureKind),
93    /// A fictitious `impl Destruct for T` that contains the drop glue code for the given ADT. The
94    /// `DefId` is that of the ADT.
95    ImplicitDestruct,
96}
97
98impl TransItemSource {
99    pub fn new(item: RustcItem, kind: TransItemSourceKind) -> Self {
100        if let RustcItem::Mono(item) = &item {
101            if item.has_param {
102                panic!("Item is not monomorphic: {item:?}")
103            }
104        }
105        Self { item, kind }
106    }
107
108    /// Refers to the given item. Depending on `monomorphize`, this chooses between the monomorphic
109    /// and polymorphic versions of the item.
110    pub fn from_item(item: &hax::ItemRef, kind: TransItemSourceKind, monomorphize: bool) -> Self {
111        if monomorphize {
112            Self::monomorphic(item, kind)
113        } else {
114            Self::polymorphic(&item.def_id, kind)
115        }
116    }
117
118    /// Refers to the polymorphic version of this item.
119    pub fn polymorphic(def_id: &hax::DefId, kind: TransItemSourceKind) -> Self {
120        Self::new(RustcItem::Poly(def_id.clone()), kind)
121    }
122
123    /// Refers to the monomorphic version of this item.
124    pub fn monomorphic(item: &hax::ItemRef, kind: TransItemSourceKind) -> Self {
125        Self::new(RustcItem::Mono(item.clone()), kind)
126    }
127
128    pub fn def_id(&self) -> &hax::DefId {
129        self.item.def_id()
130    }
131
132    /// Keep the same def_id but change the kind.
133    pub(crate) fn with_kind(&self, kind: TransItemSourceKind) -> Self {
134        let mut ret = self.clone();
135        ret.kind = kind;
136        ret
137    }
138
139    /// For virtual items that have a parent (typically a method impl), return this parent. Does
140    /// not attempt to generally compute the parent of an item. Used to compute names.
141    pub(crate) fn parent(&self) -> Option<Self> {
142        let parent_kind = match self.kind {
143            TransItemSourceKind::ClosureMethod(kind) => {
144                TransItemSourceKind::TraitImpl(TraitImplSource::Closure(kind))
145            }
146            TransItemSourceKind::DefaultedMethod(impl_kind, _)
147            | TransItemSourceKind::DropInPlaceMethod(Some(impl_kind))
148            | TransItemSourceKind::VTableInstance(impl_kind)
149            | TransItemSourceKind::VTableInstanceInitializer(impl_kind) => {
150                TransItemSourceKind::TraitImpl(impl_kind)
151            }
152            TransItemSourceKind::DropInPlaceMethod(None) => TransItemSourceKind::TraitDecl,
153            _ => return None,
154        };
155        Some(self.with_kind(parent_kind))
156    }
157
158    /// Whether this item is the "main" item for this def_id or not (e.g. Destruct impl/methods are not
159    /// the main item).
160    pub(crate) fn is_derived_item(&self) -> bool {
161        use TransItemSourceKind::*;
162        match self.kind {
163            Global
164            | TraitDecl
165            | TraitImpl(TraitImplSource::Normal)
166            | InherentImpl
167            | Module
168            | Fun
169            | Type => false,
170            _ => true,
171        }
172    }
173
174    /// Value with which we order values.
175    fn sort_key(&self) -> impl Ord + '_ {
176        let item_id = match &self.item {
177            RustcItem::Poly(_) => None,
178            RustcItem::Mono(item) => Some(&item.generic_args),
179        };
180        (self.def_id().index, &self.kind, item_id)
181    }
182}
183
184impl RustcItem {
185    pub fn def_id(&self) -> &hax::DefId {
186        match self {
187            RustcItem::Poly(def_id) => def_id,
188            RustcItem::Mono(item_ref) => &item_ref.def_id,
189        }
190    }
191}
192
193/// Manual impls because `DefId` is not orderable.
194impl PartialOrd for TransItemSource {
195    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
196        Some(self.cmp(other))
197    }
198}
199impl Ord for TransItemSource {
200    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
201        self.sort_key().cmp(&other.sort_key())
202    }
203}
204
205impl<'tcx, 'ctx> TranslateCtx<'tcx> {
206    /// Returns the default translation kind for the given `DefId`. Returns `None` for items that
207    /// we don't translate. Errors on unexpected items.
208    pub fn base_kind_for_item(&mut self, def_id: &hax::DefId) -> Option<TransItemSourceKind> {
209        use hax::DefKind::*;
210        Some(match &def_id.kind {
211            Enum { .. } | Struct { .. } | Union { .. } | TyAlias { .. } | ForeignTy => {
212                TransItemSourceKind::Type
213            }
214            Fn { .. } | AssocFn { .. } => TransItemSourceKind::Fun,
215            Const { .. } | Static { .. } | AssocConst { .. } => TransItemSourceKind::Global,
216            Trait { .. } | TraitAlias { .. } => TransItemSourceKind::TraitDecl,
217            Impl { of_trait: true } => TransItemSourceKind::TraitImpl(TraitImplSource::Normal),
218            Impl { of_trait: false } => TransItemSourceKind::InherentImpl,
219            Mod { .. } | ForeignMod { .. } => TransItemSourceKind::Module,
220
221            // We skip these
222            ExternCrate { .. } | GlobalAsm { .. } | Macro { .. } | Use { .. } => return None,
223            // These can happen when doing `--start-from` on a foreign crate. We can skip them
224            // because their parents will already have been registered.
225            Ctor { .. } | Variant { .. } => return None,
226            // We cannot encounter these since they're not top-level items.
227            AnonConst { .. }
228            | AssocTy { .. }
229            | Closure { .. }
230            | ConstParam { .. }
231            | Field { .. }
232            | InlineConst { .. }
233            | PromotedConst { .. }
234            | LifetimeParam { .. }
235            | OpaqueTy { .. }
236            | SyntheticCoroutineBody { .. }
237            | TyParam { .. } => {
238                let span = self.def_span(def_id);
239                register_error!(
240                    self,
241                    span,
242                    "Cannot register item `{def_id:?}` with kind `{:?}`",
243                    def_id.kind
244                );
245                return None;
246            }
247        })
248    }
249
250    /// Add this item to the queue of items to translate. Each translated item will then
251    /// recursively register the items it refers to. We call this on the crate root and end up
252    /// exploring the whole crate.
253    #[tracing::instrument(skip(self))]
254    pub fn enqueue_module_item(&mut self, def_id: &hax::DefId) {
255        let Some(kind) = self.base_kind_for_item(def_id) else {
256            return;
257        };
258        let item_src = if self.options.monomorphize_with_hax {
259            if let Ok(def) = self.poly_hax_def(def_id)
260                && !def.has_any_generics()
261            {
262                // Monomorphize this item and the items it depends on.
263                TransItemSource::monomorphic(def.this(), kind)
264            } else {
265                // Skip polymorphic items and items that cause errors.
266                return;
267            }
268        } else {
269            TransItemSource::polymorphic(def_id, kind)
270        };
271        let _: Option<ItemId> = self.register_and_enqueue(&None, item_src);
272    }
273
274    pub(crate) fn register_no_enqueue<T: TryFrom<ItemId>>(
275        &mut self,
276        dep_src: &Option<DepSource>,
277        src: &TransItemSource,
278    ) -> Option<T> {
279        let item_id = match self.id_map.get(src) {
280            Some(tid) => *tid,
281            None => {
282                use TransItemSourceKind::*;
283                let trans_id = match src.kind {
284                    Type | VTable => ItemId::Type(self.translated.type_decls.reserve_slot()),
285                    TraitDecl => ItemId::TraitDecl(self.translated.trait_decls.reserve_slot()),
286                    TraitImpl(..) => ItemId::TraitImpl(self.translated.trait_impls.reserve_slot()),
287                    Global | VTableInstance(..) => {
288                        ItemId::Global(self.translated.global_decls.reserve_slot())
289                    }
290                    Fun
291                    | DefaultedMethod(..)
292                    | ClosureMethod(..)
293                    | ClosureAsFnCast
294                    | DropInPlaceMethod(..)
295                    | VTableInstanceInitializer(..)
296                    | VTableMethod
297                    | VTableDropShim => ItemId::Fun(self.translated.fun_decls.reserve_slot()),
298                    InherentImpl | Module => return None,
299                };
300                // Add the id to the queue of declarations to translate
301                self.id_map.insert(src.clone(), trans_id);
302                self.reverse_id_map.insert(trans_id, src.clone());
303                // Store the name early so the name matcher can identify paths.
304                if let Ok(name) = self.translate_name(src) {
305                    self.translated.item_names.insert(trans_id, name);
306                }
307                trans_id
308            }
309        };
310        self.errors
311            .borrow_mut()
312            .register_dep_source(dep_src, item_id, src.def_id().is_local);
313        item_id.try_into().ok()
314    }
315
316    /// Register this item source and enqueue it for translation.
317    pub(crate) fn register_and_enqueue<T: TryFrom<ItemId>>(
318        &mut self,
319        dep_src: &Option<DepSource>,
320        item_src: TransItemSource,
321    ) -> Option<T> {
322        let id = self.register_no_enqueue(dep_src, &item_src);
323        self.items_to_translate.insert(item_src);
324        id
325    }
326
327    /// Enqueue an item from its id.
328    pub(crate) fn enqueue_id(&mut self, id: impl Into<ItemId>) {
329        let id = id.into();
330        if self.translated.get_item(id).is_none() {
331            let item_src = self.reverse_id_map[&id].clone();
332            self.items_to_translate.insert(item_src);
333        }
334    }
335
336    pub(crate) fn register_target_info(&mut self) {
337        let target_data = &self.tcx.data_layout;
338        self.translated.target_information = krate::TargetInfo {
339            target_pointer_size: target_data.pointer_size().bytes(),
340            is_little_endian: matches!(target_data.endian, rustc_abi::Endian::Little),
341        }
342    }
343}
344
345// Id and item reference registration.
346impl<'tcx, 'ctx> ItemTransCtx<'tcx, 'ctx> {
347    pub(crate) fn make_dep_source(&self, span: Span) -> Option<DepSource> {
348        Some(DepSource {
349            src_id: self.item_id?,
350            span: self.item_src.def_id().is_local.then_some(span),
351        })
352    }
353
354    /// Register this item source and enqueue it for translation.
355    pub(crate) fn register_and_enqueue<T: TryFrom<ItemId>>(
356        &mut self,
357        span: Span,
358        item_src: TransItemSource,
359    ) -> T {
360        let dep_src = self.make_dep_source(span);
361        self.t_ctx.register_and_enqueue(&dep_src, item_src).unwrap()
362    }
363
364    pub(crate) fn register_no_enqueue<T: TryFrom<ItemId>>(
365        &mut self,
366        span: Span,
367        src: &TransItemSource,
368    ) -> T {
369        let dep_src = self.make_dep_source(span);
370        self.t_ctx.register_no_enqueue(&dep_src, src).unwrap()
371    }
372
373    /// Register this item and maybe enqueue it for translation.
374    pub(crate) fn register_item_maybe_enqueue<T: TryFrom<ItemId>>(
375        &mut self,
376        span: Span,
377        enqueue: bool,
378        item: &hax::ItemRef,
379        kind: TransItemSourceKind,
380    ) -> T {
381        let item = if self.monomorphize() && item.has_param {
382            item.erase(self.hax_state_with_id())
383        } else {
384            item.clone()
385        };
386        let item_src = TransItemSource::from_item(&item, kind, self.monomorphize());
387        if enqueue {
388            self.register_and_enqueue(span, item_src)
389        } else {
390            self.register_no_enqueue(span, &item_src)
391        }
392    }
393
394    /// Register this item and enqueue it for translation.
395    pub(crate) fn register_item<T: TryFrom<ItemId>>(
396        &mut self,
397        span: Span,
398        item: &hax::ItemRef,
399        kind: TransItemSourceKind,
400    ) -> T {
401        self.register_item_maybe_enqueue(span, true, item, kind)
402    }
403
404    /// Register this item without enqueueing it for translation.
405    #[expect(dead_code)]
406    pub(crate) fn register_item_no_enqueue<T: TryFrom<ItemId>>(
407        &mut self,
408        span: Span,
409        item: &hax::ItemRef,
410        kind: TransItemSourceKind,
411    ) -> T {
412        self.register_item_maybe_enqueue(span, false, item, kind)
413    }
414
415    /// Register this item and maybe enqueue it for translation.
416    pub(crate) fn translate_item_maybe_enqueue<T: TryFrom<DeclRef<ItemId>>>(
417        &mut self,
418        span: Span,
419        enqueue: bool,
420        item: &hax::ItemRef,
421        kind: TransItemSourceKind,
422    ) -> Result<T, Error> {
423        let id: ItemId = self.register_item_maybe_enqueue(span, enqueue, item, kind);
424        let generics = if self.monomorphize() {
425            GenericArgs::empty()
426        } else {
427            self.translate_generic_args(span, &item.generic_args, &item.impl_exprs)?
428        };
429        let trait_ref = item
430            .in_trait
431            .as_ref()
432            .map(|impl_expr| self.translate_trait_impl_expr(span, impl_expr))
433            .transpose()?;
434        let item = DeclRef {
435            id,
436            generics: Box::new(generics),
437            trait_ref,
438        };
439        Ok(item.try_into().ok().unwrap())
440    }
441
442    /// Register this item and enqueue it for translation.
443    ///
444    /// Note: for `FnPtr`s use `translate_fn_ptr` instead, as this handles late-bound variables
445    /// correctly. For `TypeDeclRef`s use `translate_type_decl_ref` instead, as this correctly
446    /// recognizes built-in types.
447    pub(crate) fn translate_item<T: TryFrom<DeclRef<ItemId>>>(
448        &mut self,
449        span: Span,
450        item: &hax::ItemRef,
451        kind: TransItemSourceKind,
452    ) -> Result<T, Error> {
453        self.translate_item_maybe_enqueue(span, true, item, kind)
454    }
455
456    /// Register this item and don't enqueue it for translation.
457    #[expect(dead_code)]
458    pub(crate) fn translate_item_no_enqueue<T: TryFrom<DeclRef<ItemId>>>(
459        &mut self,
460        span: Span,
461        item: &hax::ItemRef,
462        kind: TransItemSourceKind,
463    ) -> Result<T, Error> {
464        self.translate_item_maybe_enqueue(span, false, item, kind)
465    }
466
467    /// Translate a type def id
468    pub(crate) fn translate_type_decl_ref(
469        &mut self,
470        span: Span,
471        item: &hax::ItemRef,
472    ) -> Result<TypeDeclRef, Error> {
473        match self.recognize_builtin_type(item)? {
474            Some(id) => {
475                let generics =
476                    self.translate_generic_args(span, &item.generic_args, &item.impl_exprs)?;
477                Ok(TypeDeclRef {
478                    id: TypeId::Builtin(id),
479                    generics: Box::new(generics),
480                })
481            }
482            None => self.translate_item(span, item, TransItemSourceKind::Type),
483        }
484    }
485
486    /// Translate a function def id
487    pub(crate) fn translate_fun_item(
488        &mut self,
489        span: Span,
490        item: &hax::ItemRef,
491        kind: TransItemSourceKind,
492    ) -> Result<MaybeBuiltinFunDeclRef, Error> {
493        match self.recognize_builtin_fun(item)? {
494            Some(id) => {
495                let generics =
496                    self.translate_generic_args(span, &item.generic_args, &item.impl_exprs)?;
497                Ok(MaybeBuiltinFunDeclRef {
498                    id: FunId::Builtin(id),
499                    generics: Box::new(generics),
500                    trait_ref: None,
501                })
502            }
503            None => self.translate_item(span, item, kind),
504        }
505    }
506
507    /// Auxiliary function to translate function calls and references to functions.
508    /// Translate a function id applied with some substitutions.
509    #[tracing::instrument(skip(self, span))]
510    pub(crate) fn translate_fn_ptr(
511        &mut self,
512        span: Span,
513        item: &hax::ItemRef,
514        kind: TransItemSourceKind,
515    ) -> Result<RegionBinder<FnPtr>, Error> {
516        let fun_item = self.translate_fun_item(span, item, kind)?;
517        let late_bound = match self.hax_def(item)?.kind() {
518            hax::FullDefKind::Fn { sig, .. } | hax::FullDefKind::AssocFn { sig, .. } => {
519                Some(sig.as_ref().rebind(()))
520            }
521            _ => None,
522        };
523        let bound_generics =
524            self.append_late_bound_to_generics(span, *fun_item.generics, late_bound)?;
525        let fun_id = match fun_item.trait_ref {
526            // Direct function call
527            None => FnPtrKind::Fun(fun_item.id),
528            // Trait method
529            Some(trait_ref) => {
530                let name = self.t_ctx.translate_trait_item_name(&item.def_id)?;
531                let method_decl_id = *fun_item
532                    .id
533                    .as_regular()
534                    .expect("methods are not builtin functions");
535                self.mark_method_as_used(trait_ref.trait_decl_ref.skip_binder.id, name);
536                FnPtrKind::Trait(trait_ref.move_under_binder(), name, method_decl_id)
537            }
538        };
539        Ok(bound_generics.map(|generics| FnPtr::new(fun_id, generics)))
540    }
541
542    pub(crate) fn translate_global_decl_ref(
543        &mut self,
544        span: Span,
545        item: &hax::ItemRef,
546    ) -> Result<GlobalDeclRef, Error> {
547        self.translate_item(span, item, TransItemSourceKind::Global)
548    }
549
550    pub(crate) fn translate_trait_decl_ref(
551        &mut self,
552        span: Span,
553        item: &hax::ItemRef,
554    ) -> Result<TraitDeclRef, Error> {
555        self.translate_item(span, item, TransItemSourceKind::TraitDecl)
556    }
557
558    pub(crate) fn translate_trait_impl_ref(
559        &mut self,
560        span: Span,
561        item: &hax::ItemRef,
562        kind: TraitImplSource,
563    ) -> Result<TraitImplRef, Error> {
564        self.translate_item(span, item, TransItemSourceKind::TraitImpl(kind))
565    }
566}
567
568#[tracing::instrument(skip(tcx))]
569pub fn translate<'tcx, 'ctx>(
570    cli_options: &CliOpts,
571    tcx: TyCtxt<'tcx>,
572    sysroot: PathBuf,
573) -> TransformCtx {
574    let mut error_ctx = ErrorCtx::new(!cli_options.abort_on_error, cli_options.error_on_warnings);
575    let translate_options = TranslateOptions::new(&mut error_ctx, cli_options);
576
577    let mut hax_state = hax::state::State::new(
578        tcx,
579        hax::options::Options {
580            item_ref_use_concrete_impl: true,
581            inline_anon_consts: !translate_options.raw_consts,
582            bounds_options: hax::options::BoundsOptions {
583                resolve_destruct: translate_options.add_destruct_bounds,
584                prune_sized: cli_options.hide_marker_traits,
585            },
586        },
587    );
588    // This suppresses warnings when trait resolution fails. We don't need them since we emit our
589    // own.
590    hax_state.base.silence_resolution_errors = true;
591
592    let crate_def_id: hax::DefId = rustc_span::def_id::CRATE_DEF_ID
593        .to_def_id()
594        .sinto(&hax_state);
595    let crate_name = crate_def_id.krate.clone();
596    trace!("# Crate: {}", crate_name);
597
598    let mut ctx = TranslateCtx {
599        tcx,
600        sysroot,
601        hax_state,
602        options: translate_options,
603        errors: RefCell::new(error_ctx),
604        translated: TranslatedCrate {
605            crate_name,
606            options: cli_options.clone(),
607            ..TranslatedCrate::default()
608        },
609        method_status: Default::default(),
610        id_map: Default::default(),
611        reverse_id_map: Default::default(),
612        file_to_id: Default::default(),
613        items_to_translate: Default::default(),
614        processed: Default::default(),
615        translate_stack: Default::default(),
616        cached_item_metas: Default::default(),
617        cached_names: Default::default(),
618    };
619    ctx.register_target_info();
620
621    // Start translating from the selected items.
622    for pat in ctx.options.start_from.clone() {
623        match super::resolve_path::def_path_def_ids(&ctx.hax_state, &pat) {
624            Ok(resolved) => {
625                for def_id in resolved {
626                    let def_id: hax::DefId = def_id.sinto(&ctx.hax_state);
627                    ctx.enqueue_module_item(&def_id);
628                }
629            }
630            Err(err) => {
631                register_error!(
632                    ctx,
633                    Span::dummy(),
634                    "when processing starting pattern `{pat}`: {err}"
635                );
636            }
637        }
638    }
639
640    trace!(
641        "Queue after we explored the crate:\n{:?}",
642        &ctx.items_to_translate
643    );
644
645    ctx.translate_unit_metadata_const();
646
647    // Translate.
648    //
649    // For as long as the queue of items to translate is not empty, we pop the top item and
650    // translate it. If an item refers to non-translated (potentially external) items, we add them
651    // to the queue.
652    //
653    // Note that the order in which we translate the definitions doesn't matter:
654    // we never need to lookup a translated definition, and only use the map
655    // from Rust ids to translated ids.
656    while let Some(item_src) = ctx.items_to_translate.pop_first() {
657        if ctx.processed.insert(item_src.clone()) {
658            ctx.translate_item(&item_src);
659        }
660    }
661
662    // Remove methods not marked as "used". They are never called and we made sure not to translate
663    // them. This removes them from the traits and impls.
664    ctx.remove_unused_methods();
665
666    // Return the context, dropping the hax state and rustc `tcx`.
667    TransformCtx {
668        options: ctx.options,
669        translated: ctx.translated,
670        errors: ctx.errors,
671    }
672}
charon_driver/translate/translate_crate.rs

charon_driver/translate/
translate_crate.rs
