1use std::collections::hash_map::Entry::*;
2
3use rustc_abi::{CanonAbi, X86Call};
4use rustc_ast::expand::allocator::{ALLOCATOR_METHODS, NO_ALLOC_SHIM_IS_UNSTABLE, global_fn_name};
5use rustc_data_structures::unord::UnordMap;
6use rustc_hir::def::DefKind;
7use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, LOCAL_CRATE, LocalDefId};
8use rustc_middle::bug;
9use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
10use rustc_middle::middle::exported_symbols::{
11 ExportedSymbol, SymbolExportInfo, SymbolExportKind, SymbolExportLevel, metadata_symbol_name,
12};
13use rustc_middle::query::LocalCrate;
14use rustc_middle::ty::{self, GenericArgKind, GenericArgsRef, Instance, SymbolName, Ty, TyCtxt};
15use rustc_middle::util::Providers;
16use rustc_session::config::{CrateType, OomStrategy};
17use rustc_symbol_mangling::mangle_internal_symbol;
18use rustc_target::spec::{SanitizerSet, TlsModel};
19use tracing::debug;
20
21use crate::base::allocator_kind_for_codegen;
22
23fn threshold(tcx: TyCtxt<'_>) -> SymbolExportLevel {
24 crates_export_threshold(tcx.crate_types())
25}
26
27fn crate_export_threshold(crate_type: CrateType) -> SymbolExportLevel {
28 match crate_type {
29 CrateType::Executable | CrateType::Staticlib | CrateType::ProcMacro | CrateType::Cdylib => {
30 SymbolExportLevel::C
31 }
32 CrateType::Rlib | CrateType::Dylib | CrateType::Sdylib => SymbolExportLevel::Rust,
33 }
34}
35
36pub fn crates_export_threshold(crate_types: &[CrateType]) -> SymbolExportLevel {
37 if crate_types
38 .iter()
39 .any(|&crate_type| crate_export_threshold(crate_type) == SymbolExportLevel::Rust)
40 {
41 SymbolExportLevel::Rust
42 } else {
43 SymbolExportLevel::C
44 }
45}
46
47fn reachable_non_generics_provider(tcx: TyCtxt<'_>, _: LocalCrate) -> DefIdMap<SymbolExportInfo> {
48 if !tcx.sess.opts.output_types.should_codegen() && !tcx.is_sdylib_interface_build() {
49 return Default::default();
50 }
51
52 let special_runtime_crate =
60 tcx.is_panic_runtime(LOCAL_CRATE) || tcx.is_compiler_builtins(LOCAL_CRATE);
61
62 let mut reachable_non_generics: DefIdMap<_> = tcx
63 .reachable_set(())
64 .items()
65 .filter_map(|&def_id| {
66 if let Some(parent_id) = tcx.opt_local_parent(def_id)
80 && let DefKind::ForeignMod = tcx.def_kind(parent_id)
81 {
82 let library = tcx.native_library(def_id)?;
83 return library.kind.is_statically_included().then_some(def_id);
84 }
85
86 match tcx.def_kind(def_id) {
88 DefKind::Fn | DefKind::Static { .. } => {}
89 DefKind::AssocFn if tcx.impl_of_method(def_id.to_def_id()).is_some() => {}
90 _ => return None,
91 };
92
93 let generics = tcx.generics_of(def_id);
94 if generics.requires_monomorphization(tcx) {
95 return None;
96 }
97
98 if Instance::mono(tcx, def_id.into()).def.requires_inline(tcx) {
99 return None;
100 }
101
102 if tcx.cross_crate_inlinable(def_id) { None } else { Some(def_id) }
103 })
104 .map(|def_id| {
105 let name = tcx.symbol_name(Instance::mono(tcx, def_id.to_def_id())).name;
107 let used = name == "rust_eh_personality";
108
109 let export_level = if special_runtime_crate {
110 SymbolExportLevel::Rust
111 } else {
112 symbol_export_level(tcx, def_id.to_def_id())
113 };
114 let codegen_attrs = tcx.codegen_fn_attrs(def_id.to_def_id());
115 debug!(
116 "EXPORTED SYMBOL (local): {} ({:?})",
117 tcx.symbol_name(Instance::mono(tcx, def_id.to_def_id())),
118 export_level
119 );
120 let info = SymbolExportInfo {
121 level: export_level,
122 kind: if tcx.is_static(def_id.to_def_id()) {
123 if codegen_attrs.flags.contains(CodegenFnAttrFlags::THREAD_LOCAL) {
124 SymbolExportKind::Tls
125 } else {
126 SymbolExportKind::Data
127 }
128 } else {
129 SymbolExportKind::Text
130 },
131 used: codegen_attrs.flags.contains(CodegenFnAttrFlags::USED_COMPILER)
132 || codegen_attrs.flags.contains(CodegenFnAttrFlags::USED_LINKER)
133 || used,
134 rustc_std_internal_symbol: codegen_attrs
135 .flags
136 .contains(CodegenFnAttrFlags::RUSTC_STD_INTERNAL_SYMBOL),
137 };
138 (def_id.to_def_id(), info)
139 })
140 .into();
141
142 if let Some(id) = tcx.proc_macro_decls_static(()) {
143 reachable_non_generics.insert(
144 id.to_def_id(),
145 SymbolExportInfo {
146 level: SymbolExportLevel::C,
147 kind: SymbolExportKind::Data,
148 used: false,
149 rustc_std_internal_symbol: false,
150 },
151 );
152 }
153
154 reachable_non_generics
155}
156
157fn is_reachable_non_generic_provider_local(tcx: TyCtxt<'_>, def_id: LocalDefId) -> bool {
158 let export_threshold = threshold(tcx);
159
160 if let Some(&info) = tcx.reachable_non_generics(LOCAL_CRATE).get(&def_id.to_def_id()) {
161 info.level.is_below_threshold(export_threshold)
162 } else {
163 false
164 }
165}
166
167fn is_reachable_non_generic_provider_extern(tcx: TyCtxt<'_>, def_id: DefId) -> bool {
168 tcx.reachable_non_generics(def_id.krate).contains_key(&def_id)
169}
170
171fn exported_symbols_provider_local<'tcx>(
172 tcx: TyCtxt<'tcx>,
173 _: LocalCrate,
174) -> &'tcx [(ExportedSymbol<'tcx>, SymbolExportInfo)] {
175 if !tcx.sess.opts.output_types.should_codegen() && !tcx.is_sdylib_interface_build() {
176 return &[];
177 }
178
179 let sorted = tcx.with_stable_hashing_context(|hcx| {
182 tcx.reachable_non_generics(LOCAL_CRATE).to_sorted(&hcx, true)
183 });
184
185 let mut symbols: Vec<_> =
186 sorted.iter().map(|&(&def_id, &info)| (ExportedSymbol::NonGeneric(def_id), info)).collect();
187
188 if !tcx.sess.target.dll_tls_export {
190 symbols.extend(sorted.iter().filter_map(|&(&def_id, &info)| {
191 tcx.needs_thread_local_shim(def_id).then(|| {
192 (
193 ExportedSymbol::ThreadLocalShim(def_id),
194 SymbolExportInfo {
195 level: info.level,
196 kind: SymbolExportKind::Text,
197 used: info.used,
198 rustc_std_internal_symbol: info.rustc_std_internal_symbol,
199 },
200 )
201 })
202 }))
203 }
204
205 if tcx.entry_fn(()).is_some() {
206 let exported_symbol =
207 ExportedSymbol::NoDefId(SymbolName::new(tcx, tcx.sess.target.entry_name.as_ref()));
208
209 symbols.push((
210 exported_symbol,
211 SymbolExportInfo {
212 level: SymbolExportLevel::C,
213 kind: SymbolExportKind::Text,
214 used: false,
215 rustc_std_internal_symbol: false,
216 },
217 ));
218 }
219
220 if allocator_kind_for_codegen(tcx).is_some() {
222 for symbol_name in ALLOCATOR_METHODS
223 .iter()
224 .map(|method| mangle_internal_symbol(tcx, global_fn_name(method.name).as_str()))
225 .chain([
226 mangle_internal_symbol(tcx, "__rust_alloc_error_handler"),
227 mangle_internal_symbol(tcx, OomStrategy::SYMBOL),
228 mangle_internal_symbol(tcx, NO_ALLOC_SHIM_IS_UNSTABLE),
229 ])
230 {
231 let exported_symbol = ExportedSymbol::NoDefId(SymbolName::new(tcx, &symbol_name));
232
233 symbols.push((
234 exported_symbol,
235 SymbolExportInfo {
236 level: SymbolExportLevel::Rust,
237 kind: SymbolExportKind::Text,
238 used: false,
239 rustc_std_internal_symbol: true,
240 },
241 ));
242 }
243 }
244
245 if tcx.sess.instrument_coverage() || tcx.sess.opts.cg.profile_generate.enabled() {
246 const PROFILER_WEAK_SYMBOLS: [&str; 2] =
250 ["__llvm_profile_raw_version", "__llvm_profile_filename"];
251
252 symbols.extend(PROFILER_WEAK_SYMBOLS.iter().map(|sym| {
253 let exported_symbol = ExportedSymbol::NoDefId(SymbolName::new(tcx, sym));
254 (
255 exported_symbol,
256 SymbolExportInfo {
257 level: SymbolExportLevel::C,
258 kind: SymbolExportKind::Data,
259 used: false,
260 rustc_std_internal_symbol: false,
261 },
262 )
263 }));
264 }
265
266 if tcx.sess.opts.unstable_opts.sanitizer.contains(SanitizerSet::MEMORY) {
267 let mut msan_weak_symbols = Vec::new();
268
269 if tcx.sess.opts.unstable_opts.sanitizer_recover.contains(SanitizerSet::MEMORY) {
271 msan_weak_symbols.push("__msan_keep_going");
272 }
273
274 if tcx.sess.opts.unstable_opts.sanitizer_memory_track_origins != 0 {
275 msan_weak_symbols.push("__msan_track_origins");
276 }
277
278 symbols.extend(msan_weak_symbols.into_iter().map(|sym| {
279 let exported_symbol = ExportedSymbol::NoDefId(SymbolName::new(tcx, sym));
280 (
281 exported_symbol,
282 SymbolExportInfo {
283 level: SymbolExportLevel::C,
284 kind: SymbolExportKind::Data,
285 used: false,
286 rustc_std_internal_symbol: false,
287 },
288 )
289 }));
290 }
291
292 if tcx.crate_types().contains(&CrateType::Dylib)
293 || tcx.crate_types().contains(&CrateType::ProcMacro)
294 {
295 let symbol_name = metadata_symbol_name(tcx);
296 let exported_symbol = ExportedSymbol::NoDefId(SymbolName::new(tcx, &symbol_name));
297
298 symbols.push((
299 exported_symbol,
300 SymbolExportInfo {
301 level: SymbolExportLevel::C,
302 kind: SymbolExportKind::Data,
303 used: true,
304 rustc_std_internal_symbol: false,
305 },
306 ));
307 }
308
309 if tcx.local_crate_exports_generics() {
310 use rustc_middle::mir::mono::{Linkage, MonoItem, Visibility};
311 use rustc_middle::ty::InstanceKind;
312
313 let need_visibility = tcx.sess.target.dynamic_linking && !tcx.sess.target.only_cdylib;
319
320 let cgus = tcx.collect_and_partition_mono_items(()).codegen_units;
321
322 let reachable_set = tcx.reachable_set(());
324 let is_local_to_current_crate = |ty: Ty<'_>| {
325 let no_refs = ty.peel_refs();
326 let root_def_id = match no_refs.kind() {
327 ty::Closure(closure, _) => *closure,
328 ty::FnDef(def_id, _) => *def_id,
329 ty::Coroutine(def_id, _) => *def_id,
330 ty::CoroutineClosure(def_id, _) => *def_id,
331 ty::CoroutineWitness(def_id, _) => *def_id,
332 _ => return false,
333 };
334 let Some(root_def_id) = root_def_id.as_local() else {
335 return false;
336 };
337
338 let is_local = !reachable_set.contains(&root_def_id);
339 is_local
340 };
341
342 let is_instantiable_downstream =
343 |did: Option<DefId>, generic_args: GenericArgsRef<'tcx>| {
344 generic_args
345 .types()
346 .chain(did.into_iter().map(move |did| tcx.type_of(did).skip_binder()))
347 .all(move |arg| {
348 arg.walk().all(|ty| {
349 ty.as_type().map_or(true, |ty| !is_local_to_current_crate(ty))
350 })
351 })
352 };
353
354 #[allow(rustc::potential_query_instability)]
356 for (mono_item, data) in cgus.iter().flat_map(|cgu| cgu.items().iter()) {
357 if data.linkage != Linkage::External {
358 continue;
361 }
362
363 if need_visibility && data.visibility == Visibility::Hidden {
364 continue;
367 }
368
369 if !tcx.sess.opts.share_generics() {
370 if tcx.codegen_fn_attrs(mono_item.def_id()).inline
371 == rustc_attr_data_structures::InlineAttr::Never
372 {
373 } else {
376 continue;
377 }
378 }
379
380 match *mono_item {
383 MonoItem::Fn(Instance { def: InstanceKind::Item(def), args }) => {
384 let has_generics = args.non_erasable_generics().next().is_some();
385
386 let should_export =
387 has_generics && is_instantiable_downstream(Some(def), &args);
388
389 if should_export {
390 let symbol = ExportedSymbol::Generic(def, args);
391 symbols.push((
392 symbol,
393 SymbolExportInfo {
394 level: SymbolExportLevel::Rust,
395 kind: SymbolExportKind::Text,
396 used: false,
397 rustc_std_internal_symbol: false,
398 },
399 ));
400 }
401 }
402 MonoItem::Fn(Instance { def: InstanceKind::DropGlue(_, Some(ty)), args }) => {
403 assert_eq!(args.non_erasable_generics().next(), Some(GenericArgKind::Type(ty)));
405
406 let should_export = match ty.kind() {
408 ty::Adt(_, args) => is_instantiable_downstream(None, args),
409 ty::Closure(_, args) => is_instantiable_downstream(None, args),
410 _ => true,
411 };
412
413 if should_export {
414 symbols.push((
415 ExportedSymbol::DropGlue(ty),
416 SymbolExportInfo {
417 level: SymbolExportLevel::Rust,
418 kind: SymbolExportKind::Text,
419 used: false,
420 rustc_std_internal_symbol: false,
421 },
422 ));
423 }
424 }
425 MonoItem::Fn(Instance {
426 def: InstanceKind::AsyncDropGlueCtorShim(_, ty),
427 args,
428 }) => {
429 assert_eq!(args.non_erasable_generics().next(), Some(GenericArgKind::Type(ty)));
431 symbols.push((
432 ExportedSymbol::AsyncDropGlueCtorShim(ty),
433 SymbolExportInfo {
434 level: SymbolExportLevel::Rust,
435 kind: SymbolExportKind::Text,
436 used: false,
437 rustc_std_internal_symbol: false,
438 },
439 ));
440 }
441 MonoItem::Fn(Instance { def: InstanceKind::AsyncDropGlue(def, ty), args: _ }) => {
442 symbols.push((
443 ExportedSymbol::AsyncDropGlue(def, ty),
444 SymbolExportInfo {
445 level: SymbolExportLevel::Rust,
446 kind: SymbolExportKind::Text,
447 used: false,
448 rustc_std_internal_symbol: false,
449 },
450 ));
451 }
452 _ => {
453 }
455 }
456 }
457 }
458
459 symbols.sort_by_cached_key(|s| s.0.symbol_name_for_local_instance(tcx));
461
462 tcx.arena.alloc_from_iter(symbols)
463}
464
465fn upstream_monomorphizations_provider(
466 tcx: TyCtxt<'_>,
467 (): (),
468) -> DefIdMap<UnordMap<GenericArgsRef<'_>, CrateNum>> {
469 let cnums = tcx.crates(());
470
471 let mut instances: DefIdMap<UnordMap<_, _>> = Default::default();
472
473 let drop_in_place_fn_def_id = tcx.lang_items().drop_in_place_fn();
474 let async_drop_in_place_fn_def_id = tcx.lang_items().async_drop_in_place_fn();
475
476 for &cnum in cnums.iter() {
477 for (exported_symbol, _) in tcx.exported_symbols(cnum).iter() {
478 let (def_id, args) = match *exported_symbol {
479 ExportedSymbol::Generic(def_id, args) => (def_id, args),
480 ExportedSymbol::DropGlue(ty) => {
481 if let Some(drop_in_place_fn_def_id) = drop_in_place_fn_def_id {
482 (drop_in_place_fn_def_id, tcx.mk_args(&[ty.into()]))
483 } else {
484 continue;
487 }
488 }
489 ExportedSymbol::AsyncDropGlueCtorShim(ty) => {
490 if let Some(async_drop_in_place_fn_def_id) = async_drop_in_place_fn_def_id {
491 (async_drop_in_place_fn_def_id, tcx.mk_args(&[ty.into()]))
492 } else {
493 continue;
494 }
495 }
496 ExportedSymbol::AsyncDropGlue(def_id, ty) => (def_id, tcx.mk_args(&[ty.into()])),
497 ExportedSymbol::NonGeneric(..)
498 | ExportedSymbol::ThreadLocalShim(..)
499 | ExportedSymbol::NoDefId(..) => {
500 continue;
502 }
503 };
504
505 let args_map = instances.entry(def_id).or_default();
506
507 match args_map.entry(args) {
508 Occupied(mut e) => {
509 let other_cnum = *e.get();
512 if tcx.stable_crate_id(other_cnum) > tcx.stable_crate_id(cnum) {
513 e.insert(cnum);
514 }
515 }
516 Vacant(e) => {
517 e.insert(cnum);
518 }
519 }
520 }
521 }
522
523 instances
524}
525
526fn upstream_monomorphizations_for_provider(
527 tcx: TyCtxt<'_>,
528 def_id: DefId,
529) -> Option<&UnordMap<GenericArgsRef<'_>, CrateNum>> {
530 assert!(!def_id.is_local());
531 tcx.upstream_monomorphizations(()).get(&def_id)
532}
533
534fn upstream_drop_glue_for_provider<'tcx>(
535 tcx: TyCtxt<'tcx>,
536 args: GenericArgsRef<'tcx>,
537) -> Option<CrateNum> {
538 let def_id = tcx.lang_items().drop_in_place_fn()?;
539 tcx.upstream_monomorphizations_for(def_id)?.get(&args).cloned()
540}
541
542fn upstream_async_drop_glue_for_provider<'tcx>(
543 tcx: TyCtxt<'tcx>,
544 args: GenericArgsRef<'tcx>,
545) -> Option<CrateNum> {
546 let def_id = tcx.lang_items().async_drop_in_place_fn()?;
547 tcx.upstream_monomorphizations_for(def_id)?.get(&args).cloned()
548}
549
550fn is_unreachable_local_definition_provider(tcx: TyCtxt<'_>, def_id: LocalDefId) -> bool {
551 !tcx.reachable_set(()).contains(&def_id)
552}
553
554pub(crate) fn provide(providers: &mut Providers) {
555 providers.reachable_non_generics = reachable_non_generics_provider;
556 providers.is_reachable_non_generic = is_reachable_non_generic_provider_local;
557 providers.exported_symbols = exported_symbols_provider_local;
558 providers.upstream_monomorphizations = upstream_monomorphizations_provider;
559 providers.is_unreachable_local_definition = is_unreachable_local_definition_provider;
560 providers.upstream_drop_glue_for = upstream_drop_glue_for_provider;
561 providers.upstream_async_drop_glue_for = upstream_async_drop_glue_for_provider;
562 providers.wasm_import_module_map = wasm_import_module_map;
563 providers.extern_queries.is_reachable_non_generic = is_reachable_non_generic_provider_extern;
564 providers.extern_queries.upstream_monomorphizations_for =
565 upstream_monomorphizations_for_provider;
566}
567
568fn symbol_export_level(tcx: TyCtxt<'_>, sym_def_id: DefId) -> SymbolExportLevel {
569 let codegen_fn_attrs = tcx.codegen_fn_attrs(sym_def_id);
575 let is_extern = codegen_fn_attrs.contains_extern_indicator();
576 let std_internal =
577 codegen_fn_attrs.flags.contains(CodegenFnAttrFlags::RUSTC_STD_INTERNAL_SYMBOL);
578
579 if is_extern && !std_internal {
580 let target = &tcx.sess.target.llvm_target;
581 if target.contains("emscripten") {
583 if let DefKind::Static { .. } = tcx.def_kind(sym_def_id) {
584 return SymbolExportLevel::Rust;
585 }
586 }
587
588 SymbolExportLevel::C
589 } else {
590 SymbolExportLevel::Rust
591 }
592}
593
594pub(crate) fn symbol_name_for_instance_in_crate<'tcx>(
596 tcx: TyCtxt<'tcx>,
597 symbol: ExportedSymbol<'tcx>,
598 instantiating_crate: CrateNum,
599) -> String {
600 if instantiating_crate == LOCAL_CRATE {
603 return symbol.symbol_name_for_local_instance(tcx).to_string();
604 }
605
606 match symbol {
609 ExportedSymbol::NonGeneric(def_id) => {
610 rustc_symbol_mangling::symbol_name_for_instance_in_crate(
611 tcx,
612 Instance::mono(tcx, def_id),
613 instantiating_crate,
614 )
615 }
616 ExportedSymbol::Generic(def_id, args) => {
617 rustc_symbol_mangling::symbol_name_for_instance_in_crate(
618 tcx,
619 Instance::new_raw(def_id, args),
620 instantiating_crate,
621 )
622 }
623 ExportedSymbol::ThreadLocalShim(def_id) => {
624 rustc_symbol_mangling::symbol_name_for_instance_in_crate(
625 tcx,
626 ty::Instance {
627 def: ty::InstanceKind::ThreadLocalShim(def_id),
628 args: ty::GenericArgs::empty(),
629 },
630 instantiating_crate,
631 )
632 }
633 ExportedSymbol::DropGlue(ty) => rustc_symbol_mangling::symbol_name_for_instance_in_crate(
634 tcx,
635 Instance::resolve_drop_in_place(tcx, ty),
636 instantiating_crate,
637 ),
638 ExportedSymbol::AsyncDropGlueCtorShim(ty) => {
639 rustc_symbol_mangling::symbol_name_for_instance_in_crate(
640 tcx,
641 Instance::resolve_async_drop_in_place(tcx, ty),
642 instantiating_crate,
643 )
644 }
645 ExportedSymbol::AsyncDropGlue(def_id, ty) => {
646 rustc_symbol_mangling::symbol_name_for_instance_in_crate(
647 tcx,
648 Instance::resolve_async_drop_in_place_poll(tcx, def_id, ty),
649 instantiating_crate,
650 )
651 }
652 ExportedSymbol::NoDefId(symbol_name) => symbol_name.to_string(),
653 }
654}
655
656fn calling_convention_for_symbol<'tcx>(
657 tcx: TyCtxt<'tcx>,
658 symbol: ExportedSymbol<'tcx>,
659) -> (CanonAbi, &'tcx [rustc_target::callconv::ArgAbi<'tcx, Ty<'tcx>>]) {
660 let instance = match symbol {
661 ExportedSymbol::NonGeneric(def_id) | ExportedSymbol::Generic(def_id, _)
662 if tcx.is_static(def_id) =>
663 {
664 None
665 }
666 ExportedSymbol::NonGeneric(def_id) => Some(Instance::mono(tcx, def_id)),
667 ExportedSymbol::Generic(def_id, args) => Some(Instance::new_raw(def_id, args)),
668 ExportedSymbol::DropGlue(..) => None,
671 ExportedSymbol::AsyncDropGlueCtorShim(..) => None,
674 ExportedSymbol::AsyncDropGlue(..) => None,
675 ExportedSymbol::NoDefId(..) => None,
677 ExportedSymbol::ThreadLocalShim(..) => None,
679 };
680
681 instance
682 .map(|i| {
683 tcx.fn_abi_of_instance(
684 ty::TypingEnv::fully_monomorphized().as_query_input((i, ty::List::empty())),
685 )
686 .unwrap_or_else(|_| bug!("fn_abi_of_instance({i:?}) failed"))
687 })
688 .map(|fnabi| (fnabi.conv, &fnabi.args[..]))
689 .unwrap_or((CanonAbi::Rust, &[]))
691}
692
693pub(crate) fn linking_symbol_name_for_instance_in_crate<'tcx>(
697 tcx: TyCtxt<'tcx>,
698 symbol: ExportedSymbol<'tcx>,
699 export_kind: SymbolExportKind,
700 instantiating_crate: CrateNum,
701) -> String {
702 let mut undecorated = symbol_name_for_instance_in_crate(tcx, symbol, instantiating_crate);
703
704 if let Some(name) = maybe_emutls_symbol_name(tcx, symbol, &undecorated) {
707 return name;
708 }
709
710 let target = &tcx.sess.target;
711 if !target.is_like_windows {
712 return undecorated;
715 }
716
717 let prefix = match &target.arch[..] {
718 "x86" => Some('_'),
719 "x86_64" => None,
720 "arm64ec" if export_kind == SymbolExportKind::Text => Some('#'),
722 _ => return undecorated,
724 };
725
726 let (callconv, args) = calling_convention_for_symbol(tcx, symbol);
727
728 let (prefix, suffix) = match callconv {
731 CanonAbi::X86(X86Call::Fastcall) => ("@", "@"),
732 CanonAbi::X86(X86Call::Stdcall) => ("_", "@"),
733 CanonAbi::X86(X86Call::Vectorcall) => ("", "@@"),
734 _ => {
735 if let Some(prefix) = prefix {
736 undecorated.insert(0, prefix);
737 }
738 return undecorated;
739 }
740 };
741
742 let args_in_bytes: u64 = args
743 .iter()
744 .map(|abi| abi.layout.size.bytes().next_multiple_of(target.pointer_width as u64 / 8))
745 .sum();
746 format!("{prefix}{undecorated}{suffix}{args_in_bytes}")
747}
748
749pub(crate) fn exporting_symbol_name_for_instance_in_crate<'tcx>(
750 tcx: TyCtxt<'tcx>,
751 symbol: ExportedSymbol<'tcx>,
752 cnum: CrateNum,
753) -> String {
754 let undecorated = symbol_name_for_instance_in_crate(tcx, symbol, cnum);
755 maybe_emutls_symbol_name(tcx, symbol, &undecorated).unwrap_or(undecorated)
756}
757
758pub(crate) fn extend_exported_symbols<'tcx>(
762 symbols: &mut Vec<(String, SymbolExportKind)>,
763 tcx: TyCtxt<'tcx>,
764 symbol: ExportedSymbol<'tcx>,
765 instantiating_crate: CrateNum,
766) {
767 let (callconv, _) = calling_convention_for_symbol(tcx, symbol);
768
769 if callconv != CanonAbi::GpuKernel || tcx.sess.target.os != "amdhsa" {
770 return;
771 }
772
773 let undecorated = symbol_name_for_instance_in_crate(tcx, symbol, instantiating_crate);
774
775 symbols.push((format!("{undecorated}.kd"), SymbolExportKind::Data));
779}
780
781fn maybe_emutls_symbol_name<'tcx>(
782 tcx: TyCtxt<'tcx>,
783 symbol: ExportedSymbol<'tcx>,
784 undecorated: &str,
785) -> Option<String> {
786 if matches!(tcx.sess.tls_model(), TlsModel::Emulated)
787 && let ExportedSymbol::NonGeneric(def_id) = symbol
788 && tcx.is_thread_local_static(def_id)
789 {
790 Some(format!("__emutls_v.{undecorated}"))
793 } else {
794 None
795 }
796}
797
798fn wasm_import_module_map(tcx: TyCtxt<'_>, cnum: CrateNum) -> DefIdMap<String> {
799 let native_libs = tcx.native_libraries(cnum);
803
804 let def_id_to_native_lib = native_libs
805 .iter()
806 .filter_map(|lib| lib.foreign_module.map(|id| (id, lib)))
807 .collect::<DefIdMap<_>>();
808
809 let mut ret = DefIdMap::default();
810 for (def_id, lib) in tcx.foreign_modules(cnum).iter() {
811 let module = def_id_to_native_lib.get(def_id).and_then(|s| s.wasm_import_module());
812 let Some(module) = module else { continue };
813 ret.extend(lib.foreign_items.iter().map(|id| {
814 assert_eq!(id.krate, cnum);
815 (*id, module.to_string())
816 }));
817 }
818
819 ret
820}