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,
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::TlsModel;
19use tracing::debug;
20
21use crate::back::symbol_export;
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_assoc(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_non_generic_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 symbols.sort_by_cached_key(|s| s.0.symbol_name_for_local_instance(tcx));
222
223 tcx.arena.alloc_from_iter(symbols)
224}
225
226fn exported_generic_symbols_provider_local<'tcx>(
227 tcx: TyCtxt<'tcx>,
228 _: LocalCrate,
229) -> &'tcx [(ExportedSymbol<'tcx>, SymbolExportInfo)] {
230 if !tcx.sess.opts.output_types.should_codegen() && !tcx.is_sdylib_interface_build() {
231 return &[];
232 }
233
234 let mut symbols: Vec<_> = vec![];
235
236 if tcx.local_crate_exports_generics() {
237 use rustc_hir::attrs::Linkage;
238 use rustc_middle::mir::mono::{MonoItem, Visibility};
239 use rustc_middle::ty::InstanceKind;
240
241 let need_visibility = tcx.sess.target.dynamic_linking && !tcx.sess.target.only_cdylib;
247
248 let cgus = tcx.collect_and_partition_mono_items(()).codegen_units;
249
250 let reachable_set = tcx.reachable_set(());
252 let is_local_to_current_crate = |ty: Ty<'_>| {
253 let no_refs = ty.peel_refs();
254 let root_def_id = match no_refs.kind() {
255 ty::Closure(closure, _) => *closure,
256 ty::FnDef(def_id, _) => *def_id,
257 ty::Coroutine(def_id, _) => *def_id,
258 ty::CoroutineClosure(def_id, _) => *def_id,
259 ty::CoroutineWitness(def_id, _) => *def_id,
260 _ => return false,
261 };
262 let Some(root_def_id) = root_def_id.as_local() else {
263 return false;
264 };
265
266 let is_local = !reachable_set.contains(&root_def_id);
267 is_local
268 };
269
270 let is_instantiable_downstream =
271 |did: Option<DefId>, generic_args: GenericArgsRef<'tcx>| {
272 generic_args
273 .types()
274 .chain(did.into_iter().map(move |did| tcx.type_of(did).skip_binder()))
275 .all(move |arg| {
276 arg.walk().all(|ty| {
277 ty.as_type().map_or(true, |ty| !is_local_to_current_crate(ty))
278 })
279 })
280 };
281
282 #[allow(rustc::potential_query_instability)]
284 for (mono_item, data) in cgus.iter().flat_map(|cgu| cgu.items().iter()) {
285 if data.linkage != Linkage::External {
286 continue;
289 }
290
291 if need_visibility && data.visibility == Visibility::Hidden {
292 continue;
295 }
296
297 if !tcx.sess.opts.share_generics() {
298 if tcx.codegen_fn_attrs(mono_item.def_id()).inline
299 == rustc_hir::attrs::InlineAttr::Never
300 {
301 } else {
304 continue;
305 }
306 }
307
308 match *mono_item {
311 MonoItem::Fn(Instance { def: InstanceKind::Item(def), args }) => {
312 let has_generics = args.non_erasable_generics().next().is_some();
313
314 let should_export =
315 has_generics && is_instantiable_downstream(Some(def), &args);
316
317 if should_export {
318 let symbol = ExportedSymbol::Generic(def, args);
319 symbols.push((
320 symbol,
321 SymbolExportInfo {
322 level: SymbolExportLevel::Rust,
323 kind: SymbolExportKind::Text,
324 used: false,
325 rustc_std_internal_symbol: false,
326 },
327 ));
328 }
329 }
330 MonoItem::Fn(Instance { def: InstanceKind::DropGlue(_, Some(ty)), args }) => {
331 assert_eq!(args.non_erasable_generics().next(), Some(GenericArgKind::Type(ty)));
333
334 let should_export = match ty.kind() {
336 ty::Adt(_, args) => is_instantiable_downstream(None, args),
337 ty::Closure(_, args) => is_instantiable_downstream(None, args),
338 _ => true,
339 };
340
341 if should_export {
342 symbols.push((
343 ExportedSymbol::DropGlue(ty),
344 SymbolExportInfo {
345 level: SymbolExportLevel::Rust,
346 kind: SymbolExportKind::Text,
347 used: false,
348 rustc_std_internal_symbol: false,
349 },
350 ));
351 }
352 }
353 MonoItem::Fn(Instance {
354 def: InstanceKind::AsyncDropGlueCtorShim(_, ty),
355 args,
356 }) => {
357 assert_eq!(args.non_erasable_generics().next(), Some(GenericArgKind::Type(ty)));
359 symbols.push((
360 ExportedSymbol::AsyncDropGlueCtorShim(ty),
361 SymbolExportInfo {
362 level: SymbolExportLevel::Rust,
363 kind: SymbolExportKind::Text,
364 used: false,
365 rustc_std_internal_symbol: false,
366 },
367 ));
368 }
369 MonoItem::Fn(Instance { def: InstanceKind::AsyncDropGlue(def, ty), args: _ }) => {
370 symbols.push((
371 ExportedSymbol::AsyncDropGlue(def, ty),
372 SymbolExportInfo {
373 level: SymbolExportLevel::Rust,
374 kind: SymbolExportKind::Text,
375 used: false,
376 rustc_std_internal_symbol: false,
377 },
378 ));
379 }
380 _ => {
381 }
383 }
384 }
385 }
386
387 symbols.sort_by_cached_key(|s| s.0.symbol_name_for_local_instance(tcx));
389
390 tcx.arena.alloc_from_iter(symbols)
391}
392
393fn upstream_monomorphizations_provider(
394 tcx: TyCtxt<'_>,
395 (): (),
396) -> DefIdMap<UnordMap<GenericArgsRef<'_>, CrateNum>> {
397 let cnums = tcx.crates(());
398
399 let mut instances: DefIdMap<UnordMap<_, _>> = Default::default();
400
401 let drop_in_place_fn_def_id = tcx.lang_items().drop_in_place_fn();
402 let async_drop_in_place_fn_def_id = tcx.lang_items().async_drop_in_place_fn();
403
404 for &cnum in cnums.iter() {
405 for (exported_symbol, _) in tcx.exported_generic_symbols(cnum).iter() {
406 let (def_id, args) = match *exported_symbol {
407 ExportedSymbol::Generic(def_id, args) => (def_id, args),
408 ExportedSymbol::DropGlue(ty) => {
409 if let Some(drop_in_place_fn_def_id) = drop_in_place_fn_def_id {
410 (drop_in_place_fn_def_id, tcx.mk_args(&[ty.into()]))
411 } else {
412 continue;
415 }
416 }
417 ExportedSymbol::AsyncDropGlueCtorShim(ty) => {
418 if let Some(async_drop_in_place_fn_def_id) = async_drop_in_place_fn_def_id {
419 (async_drop_in_place_fn_def_id, tcx.mk_args(&[ty.into()]))
420 } else {
421 continue;
422 }
423 }
424 ExportedSymbol::AsyncDropGlue(def_id, ty) => (def_id, tcx.mk_args(&[ty.into()])),
425 ExportedSymbol::NonGeneric(..)
426 | ExportedSymbol::ThreadLocalShim(..)
427 | ExportedSymbol::NoDefId(..) => unreachable!("{exported_symbol:?}"),
428 };
429
430 let args_map = instances.entry(def_id).or_default();
431
432 match args_map.entry(args) {
433 Occupied(mut e) => {
434 let other_cnum = *e.get();
437 if tcx.stable_crate_id(other_cnum) > tcx.stable_crate_id(cnum) {
438 e.insert(cnum);
439 }
440 }
441 Vacant(e) => {
442 e.insert(cnum);
443 }
444 }
445 }
446 }
447
448 instances
449}
450
451fn upstream_monomorphizations_for_provider(
452 tcx: TyCtxt<'_>,
453 def_id: DefId,
454) -> Option<&UnordMap<GenericArgsRef<'_>, CrateNum>> {
455 assert!(!def_id.is_local());
456 tcx.upstream_monomorphizations(()).get(&def_id)
457}
458
459fn upstream_drop_glue_for_provider<'tcx>(
460 tcx: TyCtxt<'tcx>,
461 args: GenericArgsRef<'tcx>,
462) -> Option<CrateNum> {
463 let def_id = tcx.lang_items().drop_in_place_fn()?;
464 tcx.upstream_monomorphizations_for(def_id)?.get(&args).cloned()
465}
466
467fn upstream_async_drop_glue_for_provider<'tcx>(
468 tcx: TyCtxt<'tcx>,
469 args: GenericArgsRef<'tcx>,
470) -> Option<CrateNum> {
471 let def_id = tcx.lang_items().async_drop_in_place_fn()?;
472 tcx.upstream_monomorphizations_for(def_id)?.get(&args).cloned()
473}
474
475fn is_unreachable_local_definition_provider(tcx: TyCtxt<'_>, def_id: LocalDefId) -> bool {
476 !tcx.reachable_set(()).contains(&def_id)
477}
478
479pub(crate) fn provide(providers: &mut Providers) {
480 providers.reachable_non_generics = reachable_non_generics_provider;
481 providers.is_reachable_non_generic = is_reachable_non_generic_provider_local;
482 providers.exported_non_generic_symbols = exported_non_generic_symbols_provider_local;
483 providers.exported_generic_symbols = exported_generic_symbols_provider_local;
484 providers.upstream_monomorphizations = upstream_monomorphizations_provider;
485 providers.is_unreachable_local_definition = is_unreachable_local_definition_provider;
486 providers.upstream_drop_glue_for = upstream_drop_glue_for_provider;
487 providers.upstream_async_drop_glue_for = upstream_async_drop_glue_for_provider;
488 providers.wasm_import_module_map = wasm_import_module_map;
489 providers.extern_queries.is_reachable_non_generic = is_reachable_non_generic_provider_extern;
490 providers.extern_queries.upstream_monomorphizations_for =
491 upstream_monomorphizations_for_provider;
492}
493
494pub(crate) fn allocator_shim_symbols(
495 tcx: TyCtxt<'_>,
496) -> impl Iterator<Item = (String, SymbolExportKind)> {
497 ALLOCATOR_METHODS
498 .iter()
499 .map(move |method| mangle_internal_symbol(tcx, global_fn_name(method.name).as_str()))
500 .chain([
501 mangle_internal_symbol(tcx, "__rust_alloc_error_handler"),
502 mangle_internal_symbol(tcx, OomStrategy::SYMBOL),
503 mangle_internal_symbol(tcx, NO_ALLOC_SHIM_IS_UNSTABLE),
504 ])
505 .map(move |symbol_name| {
506 let exported_symbol = ExportedSymbol::NoDefId(SymbolName::new(tcx, &symbol_name));
507
508 (
509 symbol_export::exporting_symbol_name_for_instance_in_crate(
510 tcx,
511 exported_symbol,
512 LOCAL_CRATE,
513 ),
514 SymbolExportKind::Text,
515 )
516 })
517}
518
519fn symbol_export_level(tcx: TyCtxt<'_>, sym_def_id: DefId) -> SymbolExportLevel {
520 let codegen_fn_attrs = tcx.codegen_fn_attrs(sym_def_id);
526 let is_extern = codegen_fn_attrs.contains_extern_indicator();
527 let std_internal =
528 codegen_fn_attrs.flags.contains(CodegenFnAttrFlags::RUSTC_STD_INTERNAL_SYMBOL);
529
530 if is_extern && !std_internal {
531 let target = &tcx.sess.target.llvm_target;
532 if target.contains("emscripten") {
534 if let DefKind::Static { .. } = tcx.def_kind(sym_def_id) {
535 return SymbolExportLevel::Rust;
536 }
537 }
538
539 SymbolExportLevel::C
540 } else {
541 SymbolExportLevel::Rust
542 }
543}
544
545pub(crate) fn symbol_name_for_instance_in_crate<'tcx>(
547 tcx: TyCtxt<'tcx>,
548 symbol: ExportedSymbol<'tcx>,
549 instantiating_crate: CrateNum,
550) -> String {
551 if instantiating_crate == LOCAL_CRATE {
554 return symbol.symbol_name_for_local_instance(tcx).to_string();
555 }
556
557 match symbol {
560 ExportedSymbol::NonGeneric(def_id) => {
561 rustc_symbol_mangling::symbol_name_for_instance_in_crate(
562 tcx,
563 Instance::mono(tcx, def_id),
564 instantiating_crate,
565 )
566 }
567 ExportedSymbol::Generic(def_id, args) => {
568 rustc_symbol_mangling::symbol_name_for_instance_in_crate(
569 tcx,
570 Instance::new_raw(def_id, args),
571 instantiating_crate,
572 )
573 }
574 ExportedSymbol::ThreadLocalShim(def_id) => {
575 rustc_symbol_mangling::symbol_name_for_instance_in_crate(
576 tcx,
577 ty::Instance {
578 def: ty::InstanceKind::ThreadLocalShim(def_id),
579 args: ty::GenericArgs::empty(),
580 },
581 instantiating_crate,
582 )
583 }
584 ExportedSymbol::DropGlue(ty) => rustc_symbol_mangling::symbol_name_for_instance_in_crate(
585 tcx,
586 Instance::resolve_drop_in_place(tcx, ty),
587 instantiating_crate,
588 ),
589 ExportedSymbol::AsyncDropGlueCtorShim(ty) => {
590 rustc_symbol_mangling::symbol_name_for_instance_in_crate(
591 tcx,
592 Instance::resolve_async_drop_in_place(tcx, ty),
593 instantiating_crate,
594 )
595 }
596 ExportedSymbol::AsyncDropGlue(def_id, ty) => {
597 rustc_symbol_mangling::symbol_name_for_instance_in_crate(
598 tcx,
599 Instance::resolve_async_drop_in_place_poll(tcx, def_id, ty),
600 instantiating_crate,
601 )
602 }
603 ExportedSymbol::NoDefId(symbol_name) => symbol_name.to_string(),
604 }
605}
606
607fn calling_convention_for_symbol<'tcx>(
608 tcx: TyCtxt<'tcx>,
609 symbol: ExportedSymbol<'tcx>,
610) -> (CanonAbi, &'tcx [rustc_target::callconv::ArgAbi<'tcx, Ty<'tcx>>]) {
611 let instance = match symbol {
612 ExportedSymbol::NonGeneric(def_id) | ExportedSymbol::Generic(def_id, _)
613 if tcx.is_static(def_id) =>
614 {
615 None
616 }
617 ExportedSymbol::NonGeneric(def_id) => Some(Instance::mono(tcx, def_id)),
618 ExportedSymbol::Generic(def_id, args) => Some(Instance::new_raw(def_id, args)),
619 ExportedSymbol::DropGlue(..) => None,
622 ExportedSymbol::AsyncDropGlueCtorShim(..) => None,
625 ExportedSymbol::AsyncDropGlue(..) => None,
626 ExportedSymbol::NoDefId(..) => None,
628 ExportedSymbol::ThreadLocalShim(..) => None,
630 };
631
632 instance
633 .map(|i| {
634 tcx.fn_abi_of_instance(
635 ty::TypingEnv::fully_monomorphized().as_query_input((i, ty::List::empty())),
636 )
637 .unwrap_or_else(|_| bug!("fn_abi_of_instance({i:?}) failed"))
638 })
639 .map(|fnabi| (fnabi.conv, &fnabi.args[..]))
640 .unwrap_or((CanonAbi::Rust, &[]))
642}
643
644pub(crate) fn linking_symbol_name_for_instance_in_crate<'tcx>(
648 tcx: TyCtxt<'tcx>,
649 symbol: ExportedSymbol<'tcx>,
650 export_kind: SymbolExportKind,
651 instantiating_crate: CrateNum,
652) -> String {
653 let mut undecorated = symbol_name_for_instance_in_crate(tcx, symbol, instantiating_crate);
654
655 if let Some(name) = maybe_emutls_symbol_name(tcx, symbol, &undecorated) {
658 return name;
659 }
660
661 let target = &tcx.sess.target;
662 if !target.is_like_windows {
663 return undecorated;
666 }
667
668 let prefix = match &target.arch[..] {
669 "x86" => Some('_'),
670 "x86_64" => None,
671 "arm64ec" if export_kind == SymbolExportKind::Text => Some('#'),
673 _ => return undecorated,
675 };
676
677 let (callconv, args) = calling_convention_for_symbol(tcx, symbol);
678
679 let (prefix, suffix) = match callconv {
682 CanonAbi::X86(X86Call::Fastcall) => ("@", "@"),
683 CanonAbi::X86(X86Call::Stdcall) => ("_", "@"),
684 CanonAbi::X86(X86Call::Vectorcall) => ("", "@@"),
685 _ => {
686 if let Some(prefix) = prefix {
687 undecorated.insert(0, prefix);
688 }
689 return undecorated;
690 }
691 };
692
693 let args_in_bytes: u64 = args
694 .iter()
695 .map(|abi| abi.layout.size.bytes().next_multiple_of(target.pointer_width as u64 / 8))
696 .sum();
697 format!("{prefix}{undecorated}{suffix}{args_in_bytes}")
698}
699
700pub(crate) fn exporting_symbol_name_for_instance_in_crate<'tcx>(
701 tcx: TyCtxt<'tcx>,
702 symbol: ExportedSymbol<'tcx>,
703 cnum: CrateNum,
704) -> String {
705 let undecorated = symbol_name_for_instance_in_crate(tcx, symbol, cnum);
706 maybe_emutls_symbol_name(tcx, symbol, &undecorated).unwrap_or(undecorated)
707}
708
709pub(crate) fn extend_exported_symbols<'tcx>(
713 symbols: &mut Vec<(String, SymbolExportKind)>,
714 tcx: TyCtxt<'tcx>,
715 symbol: ExportedSymbol<'tcx>,
716 instantiating_crate: CrateNum,
717) {
718 let (callconv, _) = calling_convention_for_symbol(tcx, symbol);
719
720 if callconv != CanonAbi::GpuKernel || tcx.sess.target.os != "amdhsa" {
721 return;
722 }
723
724 let undecorated = symbol_name_for_instance_in_crate(tcx, symbol, instantiating_crate);
725
726 symbols.push((format!("{undecorated}.kd"), SymbolExportKind::Data));
730}
731
732fn maybe_emutls_symbol_name<'tcx>(
733 tcx: TyCtxt<'tcx>,
734 symbol: ExportedSymbol<'tcx>,
735 undecorated: &str,
736) -> Option<String> {
737 if matches!(tcx.sess.tls_model(), TlsModel::Emulated)
738 && let ExportedSymbol::NonGeneric(def_id) = symbol
739 && tcx.is_thread_local_static(def_id)
740 {
741 Some(format!("__emutls_v.{undecorated}"))
744 } else {
745 None
746 }
747}
748
749fn wasm_import_module_map(tcx: TyCtxt<'_>, cnum: CrateNum) -> DefIdMap<String> {
750 let native_libs = tcx.native_libraries(cnum);
754
755 let def_id_to_native_lib = native_libs
756 .iter()
757 .filter_map(|lib| lib.foreign_module.map(|id| (id, lib)))
758 .collect::<DefIdMap<_>>();
759
760 let mut ret = DefIdMap::default();
761 for (def_id, lib) in tcx.foreign_modules(cnum).iter() {
762 let module = def_id_to_native_lib.get(def_id).and_then(|s| s.wasm_import_module());
763 let Some(module) = module else { continue };
764 ret.extend(lib.foreign_items.iter().map(|id| {
765 assert_eq!(id.krate, cnum);
766 (*id, module.to_string())
767 }));
768 }
769
770 ret
771}