1use std::collections::hash_map::Entry::*;
2
3use rustc_ast::expand::allocator::{ALLOCATOR_METHODS, NO_ALLOC_SHIM_IS_UNSTABLE, global_fn_name};
4use rustc_data_structures::unord::UnordMap;
5use rustc_hir::def::DefKind;
6use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, LOCAL_CRATE, LocalDefId};
7use rustc_middle::bug;
8use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
9use rustc_middle::middle::exported_symbols::{
10 ExportedSymbol, SymbolExportInfo, SymbolExportKind, SymbolExportLevel, metadata_symbol_name,
11};
12use rustc_middle::query::LocalCrate;
13use rustc_middle::ty::{self, GenericArgKind, GenericArgsRef, Instance, SymbolName, Ty, TyCtxt};
14use rustc_middle::util::Providers;
15use rustc_session::config::{CrateType, OomStrategy};
16use rustc_symbol_mangling::mangle_internal_symbol;
17use rustc_target::callconv::Conv;
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 => 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() {
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)
132 || codegen_attrs.flags.contains(CodegenFnAttrFlags::USED_LINKER)
133 || used,
134 };
135 (def_id.to_def_id(), info)
136 })
137 .into();
138
139 if let Some(id) = tcx.proc_macro_decls_static(()) {
140 reachable_non_generics.insert(
141 id.to_def_id(),
142 SymbolExportInfo {
143 level: SymbolExportLevel::C,
144 kind: SymbolExportKind::Data,
145 used: false,
146 },
147 );
148 }
149
150 reachable_non_generics
151}
152
153fn is_reachable_non_generic_provider_local(tcx: TyCtxt<'_>, def_id: LocalDefId) -> bool {
154 let export_threshold = threshold(tcx);
155
156 if let Some(&info) = tcx.reachable_non_generics(LOCAL_CRATE).get(&def_id.to_def_id()) {
157 info.level.is_below_threshold(export_threshold)
158 } else {
159 false
160 }
161}
162
163fn is_reachable_non_generic_provider_extern(tcx: TyCtxt<'_>, def_id: DefId) -> bool {
164 tcx.reachable_non_generics(def_id.krate).contains_key(&def_id)
165}
166
167fn exported_symbols_provider_local(
168 tcx: TyCtxt<'_>,
169 _: LocalCrate,
170) -> &[(ExportedSymbol<'_>, SymbolExportInfo)] {
171 if !tcx.sess.opts.output_types.should_codegen() {
172 return &[];
173 }
174
175 let sorted = tcx.with_stable_hashing_context(|hcx| {
178 tcx.reachable_non_generics(LOCAL_CRATE).to_sorted(&hcx, true)
179 });
180
181 let mut symbols: Vec<_> =
182 sorted.iter().map(|&(&def_id, &info)| (ExportedSymbol::NonGeneric(def_id), info)).collect();
183
184 if !tcx.sess.target.dll_tls_export {
186 symbols.extend(sorted.iter().filter_map(|&(&def_id, &info)| {
187 tcx.needs_thread_local_shim(def_id).then(|| {
188 (
189 ExportedSymbol::ThreadLocalShim(def_id),
190 SymbolExportInfo {
191 level: info.level,
192 kind: SymbolExportKind::Text,
193 used: info.used,
194 },
195 )
196 })
197 }))
198 }
199
200 if tcx.entry_fn(()).is_some() {
201 let exported_symbol =
202 ExportedSymbol::NoDefId(SymbolName::new(tcx, tcx.sess.target.entry_name.as_ref()));
203
204 symbols.push((
205 exported_symbol,
206 SymbolExportInfo {
207 level: SymbolExportLevel::C,
208 kind: SymbolExportKind::Text,
209 used: false,
210 },
211 ));
212 }
213
214 if allocator_kind_for_codegen(tcx).is_some() {
216 for symbol_name in ALLOCATOR_METHODS
217 .iter()
218 .map(|method| mangle_internal_symbol(tcx, global_fn_name(method.name).as_str()))
219 .chain([
220 mangle_internal_symbol(tcx, "__rust_alloc_error_handler"),
221 mangle_internal_symbol(tcx, OomStrategy::SYMBOL),
222 ])
223 {
224 let exported_symbol = ExportedSymbol::NoDefId(SymbolName::new(tcx, &symbol_name));
225
226 symbols.push((
227 exported_symbol,
228 SymbolExportInfo {
229 level: SymbolExportLevel::Rust,
230 kind: SymbolExportKind::Text,
231 used: false,
232 },
233 ));
234 }
235
236 let exported_symbol = ExportedSymbol::NoDefId(SymbolName::new(
237 tcx,
238 &mangle_internal_symbol(tcx, NO_ALLOC_SHIM_IS_UNSTABLE),
239 ));
240 symbols.push((
241 exported_symbol,
242 SymbolExportInfo {
243 level: SymbolExportLevel::Rust,
244 kind: SymbolExportKind::Data,
245 used: false,
246 },
247 ))
248 }
249
250 if tcx.sess.instrument_coverage() || tcx.sess.opts.cg.profile_generate.enabled() {
251 const PROFILER_WEAK_SYMBOLS: [&str; 2] =
255 ["__llvm_profile_raw_version", "__llvm_profile_filename"];
256
257 symbols.extend(PROFILER_WEAK_SYMBOLS.iter().map(|sym| {
258 let exported_symbol = ExportedSymbol::NoDefId(SymbolName::new(tcx, sym));
259 (
260 exported_symbol,
261 SymbolExportInfo {
262 level: SymbolExportLevel::C,
263 kind: SymbolExportKind::Data,
264 used: false,
265 },
266 )
267 }));
268 }
269
270 if tcx.sess.opts.unstable_opts.sanitizer.contains(SanitizerSet::MEMORY) {
271 let mut msan_weak_symbols = Vec::new();
272
273 if tcx.sess.opts.unstable_opts.sanitizer_recover.contains(SanitizerSet::MEMORY) {
275 msan_weak_symbols.push("__msan_keep_going");
276 }
277
278 if tcx.sess.opts.unstable_opts.sanitizer_memory_track_origins != 0 {
279 msan_weak_symbols.push("__msan_track_origins");
280 }
281
282 symbols.extend(msan_weak_symbols.into_iter().map(|sym| {
283 let exported_symbol = ExportedSymbol::NoDefId(SymbolName::new(tcx, sym));
284 (
285 exported_symbol,
286 SymbolExportInfo {
287 level: SymbolExportLevel::C,
288 kind: SymbolExportKind::Data,
289 used: false,
290 },
291 )
292 }));
293 }
294
295 if tcx.crate_types().contains(&CrateType::Dylib)
296 || tcx.crate_types().contains(&CrateType::ProcMacro)
297 {
298 let symbol_name = metadata_symbol_name(tcx);
299 let exported_symbol = ExportedSymbol::NoDefId(SymbolName::new(tcx, &symbol_name));
300
301 symbols.push((
302 exported_symbol,
303 SymbolExportInfo {
304 level: SymbolExportLevel::C,
305 kind: SymbolExportKind::Data,
306 used: true,
307 },
308 ));
309 }
310
311 if tcx.local_crate_exports_generics() {
312 use rustc_middle::mir::mono::{Linkage, MonoItem, Visibility};
313 use rustc_middle::ty::InstanceKind;
314
315 let need_visibility = tcx.sess.target.dynamic_linking && !tcx.sess.target.only_cdylib;
321
322 let cgus = tcx.collect_and_partition_mono_items(()).codegen_units;
323
324 #[allow(rustc::potential_query_instability)]
326 for (mono_item, data) in cgus.iter().flat_map(|cgu| cgu.items().iter()) {
327 if data.linkage != Linkage::External {
328 continue;
331 }
332
333 if need_visibility && data.visibility == Visibility::Hidden {
334 continue;
337 }
338
339 if !tcx.sess.opts.share_generics() {
340 if tcx.codegen_fn_attrs(mono_item.def_id()).inline
341 == rustc_attr_parsing::InlineAttr::Never
342 {
343 } else {
346 continue;
347 }
348 }
349
350 match *mono_item {
351 MonoItem::Fn(Instance { def: InstanceKind::Item(def), args }) => {
352 if args.non_erasable_generics().next().is_some() {
353 let symbol = ExportedSymbol::Generic(def, args);
354 symbols.push((
355 symbol,
356 SymbolExportInfo {
357 level: SymbolExportLevel::Rust,
358 kind: SymbolExportKind::Text,
359 used: false,
360 },
361 ));
362 }
363 }
364 MonoItem::Fn(Instance { def: InstanceKind::DropGlue(_, Some(ty)), args }) => {
365 assert_eq!(args.non_erasable_generics().next(), Some(GenericArgKind::Type(ty)));
367 symbols.push((
368 ExportedSymbol::DropGlue(ty),
369 SymbolExportInfo {
370 level: SymbolExportLevel::Rust,
371 kind: SymbolExportKind::Text,
372 used: false,
373 },
374 ));
375 }
376 MonoItem::Fn(Instance {
377 def: InstanceKind::AsyncDropGlueCtorShim(_, ty),
378 args,
379 }) => {
380 assert_eq!(args.non_erasable_generics().next(), Some(GenericArgKind::Type(ty)));
382 symbols.push((
383 ExportedSymbol::AsyncDropGlueCtorShim(ty),
384 SymbolExportInfo {
385 level: SymbolExportLevel::Rust,
386 kind: SymbolExportKind::Text,
387 used: false,
388 },
389 ));
390 }
391 MonoItem::Fn(Instance { def: InstanceKind::AsyncDropGlue(def, ty), args: _ }) => {
392 symbols.push((
393 ExportedSymbol::AsyncDropGlue(def, ty),
394 SymbolExportInfo {
395 level: SymbolExportLevel::Rust,
396 kind: SymbolExportKind::Text,
397 used: false,
398 },
399 ));
400 }
401 _ => {
402 }
404 }
405 }
406 }
407
408 symbols.sort_by_cached_key(|s| s.0.symbol_name_for_local_instance(tcx));
410
411 tcx.arena.alloc_from_iter(symbols)
412}
413
414fn upstream_monomorphizations_provider(
415 tcx: TyCtxt<'_>,
416 (): (),
417) -> DefIdMap<UnordMap<GenericArgsRef<'_>, CrateNum>> {
418 let cnums = tcx.crates(());
419
420 let mut instances: DefIdMap<UnordMap<_, _>> = Default::default();
421
422 let drop_in_place_fn_def_id = tcx.lang_items().drop_in_place_fn();
423 let async_drop_in_place_fn_def_id = tcx.lang_items().async_drop_in_place_fn();
424
425 for &cnum in cnums.iter() {
426 for (exported_symbol, _) in tcx.exported_symbols(cnum).iter() {
427 let (def_id, args) = match *exported_symbol {
428 ExportedSymbol::Generic(def_id, args) => (def_id, args),
429 ExportedSymbol::DropGlue(ty) => {
430 if let Some(drop_in_place_fn_def_id) = drop_in_place_fn_def_id {
431 (drop_in_place_fn_def_id, tcx.mk_args(&[ty.into()]))
432 } else {
433 continue;
436 }
437 }
438 ExportedSymbol::AsyncDropGlueCtorShim(ty) => {
439 if let Some(async_drop_in_place_fn_def_id) = async_drop_in_place_fn_def_id {
440 (async_drop_in_place_fn_def_id, tcx.mk_args(&[ty.into()]))
441 } else {
442 continue;
443 }
444 }
445 ExportedSymbol::AsyncDropGlue(def_id, ty) => (def_id, tcx.mk_args(&[ty.into()])),
446 ExportedSymbol::NonGeneric(..)
447 | ExportedSymbol::ThreadLocalShim(..)
448 | ExportedSymbol::NoDefId(..) => {
449 continue;
451 }
452 };
453
454 let args_map = instances.entry(def_id).or_default();
455
456 match args_map.entry(args) {
457 Occupied(mut e) => {
458 let other_cnum = *e.get();
461 if tcx.stable_crate_id(other_cnum) > tcx.stable_crate_id(cnum) {
462 e.insert(cnum);
463 }
464 }
465 Vacant(e) => {
466 e.insert(cnum);
467 }
468 }
469 }
470 }
471
472 instances
473}
474
475fn upstream_monomorphizations_for_provider(
476 tcx: TyCtxt<'_>,
477 def_id: DefId,
478) -> Option<&UnordMap<GenericArgsRef<'_>, CrateNum>> {
479 assert!(!def_id.is_local());
480 tcx.upstream_monomorphizations(()).get(&def_id)
481}
482
483fn upstream_drop_glue_for_provider<'tcx>(
484 tcx: TyCtxt<'tcx>,
485 args: GenericArgsRef<'tcx>,
486) -> Option<CrateNum> {
487 let def_id = tcx.lang_items().drop_in_place_fn()?;
488 tcx.upstream_monomorphizations_for(def_id)?.get(&args).cloned()
489}
490
491fn upstream_async_drop_glue_for_provider<'tcx>(
492 tcx: TyCtxt<'tcx>,
493 args: GenericArgsRef<'tcx>,
494) -> Option<CrateNum> {
495 let def_id = tcx.lang_items().async_drop_in_place_fn()?;
496 tcx.upstream_monomorphizations_for(def_id)?.get(&args).cloned()
497}
498
499fn is_unreachable_local_definition_provider(tcx: TyCtxt<'_>, def_id: LocalDefId) -> bool {
500 !tcx.reachable_set(()).contains(&def_id)
501}
502
503pub(crate) fn provide(providers: &mut Providers) {
504 providers.reachable_non_generics = reachable_non_generics_provider;
505 providers.is_reachable_non_generic = is_reachable_non_generic_provider_local;
506 providers.exported_symbols = exported_symbols_provider_local;
507 providers.upstream_monomorphizations = upstream_monomorphizations_provider;
508 providers.is_unreachable_local_definition = is_unreachable_local_definition_provider;
509 providers.upstream_drop_glue_for = upstream_drop_glue_for_provider;
510 providers.upstream_async_drop_glue_for = upstream_async_drop_glue_for_provider;
511 providers.wasm_import_module_map = wasm_import_module_map;
512 providers.extern_queries.is_reachable_non_generic = is_reachable_non_generic_provider_extern;
513 providers.extern_queries.upstream_monomorphizations_for =
514 upstream_monomorphizations_for_provider;
515}
516
517fn symbol_export_level(tcx: TyCtxt<'_>, sym_def_id: DefId) -> SymbolExportLevel {
518 let codegen_fn_attrs = tcx.codegen_fn_attrs(sym_def_id);
524 let is_extern = codegen_fn_attrs.contains_extern_indicator();
525 let std_internal =
526 codegen_fn_attrs.flags.contains(CodegenFnAttrFlags::RUSTC_STD_INTERNAL_SYMBOL);
527
528 if is_extern && !std_internal {
529 let target = &tcx.sess.target.llvm_target;
530 if target.contains("emscripten") {
532 if let DefKind::Static { .. } = tcx.def_kind(sym_def_id) {
533 return SymbolExportLevel::Rust;
534 }
535 }
536
537 SymbolExportLevel::C
538 } else {
539 SymbolExportLevel::Rust
540 }
541}
542
543pub(crate) fn symbol_name_for_instance_in_crate<'tcx>(
545 tcx: TyCtxt<'tcx>,
546 symbol: ExportedSymbol<'tcx>,
547 instantiating_crate: CrateNum,
548) -> String {
549 if instantiating_crate == LOCAL_CRATE {
552 return symbol.symbol_name_for_local_instance(tcx).to_string();
553 }
554
555 match symbol {
558 ExportedSymbol::NonGeneric(def_id) => {
559 rustc_symbol_mangling::symbol_name_for_instance_in_crate(
560 tcx,
561 Instance::mono(tcx, def_id),
562 instantiating_crate,
563 )
564 }
565 ExportedSymbol::Generic(def_id, args) => {
566 rustc_symbol_mangling::symbol_name_for_instance_in_crate(
567 tcx,
568 Instance::new(def_id, args),
569 instantiating_crate,
570 )
571 }
572 ExportedSymbol::ThreadLocalShim(def_id) => {
573 rustc_symbol_mangling::symbol_name_for_instance_in_crate(
574 tcx,
575 ty::Instance {
576 def: ty::InstanceKind::ThreadLocalShim(def_id),
577 args: ty::GenericArgs::empty(),
578 },
579 instantiating_crate,
580 )
581 }
582 ExportedSymbol::DropGlue(ty) => rustc_symbol_mangling::symbol_name_for_instance_in_crate(
583 tcx,
584 Instance::resolve_drop_in_place(tcx, ty),
585 instantiating_crate,
586 ),
587 ExportedSymbol::AsyncDropGlueCtorShim(ty) => {
588 rustc_symbol_mangling::symbol_name_for_instance_in_crate(
589 tcx,
590 Instance::resolve_async_drop_in_place(tcx, ty),
591 instantiating_crate,
592 )
593 }
594 ExportedSymbol::AsyncDropGlue(def_id, ty) => {
595 rustc_symbol_mangling::symbol_name_for_instance_in_crate(
596 tcx,
597 Instance::resolve_async_drop_in_place_poll(tcx, def_id, ty),
598 instantiating_crate,
599 )
600 }
601 ExportedSymbol::NoDefId(symbol_name) => symbol_name.to_string(),
602 }
603}
604
605fn calling_convention_for_symbol<'tcx>(
606 tcx: TyCtxt<'tcx>,
607 symbol: ExportedSymbol<'tcx>,
608) -> (Conv, &'tcx [rustc_target::callconv::ArgAbi<'tcx, Ty<'tcx>>]) {
609 let instance = match symbol {
610 ExportedSymbol::NonGeneric(def_id) | ExportedSymbol::Generic(def_id, _)
611 if tcx.is_static(def_id) =>
612 {
613 None
614 }
615 ExportedSymbol::NonGeneric(def_id) => Some(Instance::mono(tcx, def_id)),
616 ExportedSymbol::Generic(def_id, args) => Some(Instance::new(def_id, args)),
617 ExportedSymbol::DropGlue(..) => None,
620 ExportedSymbol::AsyncDropGlueCtorShim(..) => None,
623 ExportedSymbol::AsyncDropGlue(..) => None,
624 ExportedSymbol::NoDefId(..) => None,
626 ExportedSymbol::ThreadLocalShim(..) => None,
628 };
629
630 instance
631 .map(|i| {
632 tcx.fn_abi_of_instance(
633 ty::TypingEnv::fully_monomorphized().as_query_input((i, ty::List::empty())),
634 )
635 .unwrap_or_else(|_| bug!("fn_abi_of_instance({i:?}) failed"))
636 })
637 .map(|fnabi| (fnabi.conv, &fnabi.args[..]))
638 .unwrap_or((Conv::Rust, &[]))
640}
641
642pub(crate) fn linking_symbol_name_for_instance_in_crate<'tcx>(
646 tcx: TyCtxt<'tcx>,
647 symbol: ExportedSymbol<'tcx>,
648 instantiating_crate: CrateNum,
649) -> String {
650 let mut undecorated = symbol_name_for_instance_in_crate(tcx, symbol, instantiating_crate);
651
652 if let Some(name) = maybe_emutls_symbol_name(tcx, symbol, &undecorated) {
655 return name;
656 }
657
658 let target = &tcx.sess.target;
659 if !target.is_like_windows {
660 return undecorated;
663 }
664
665 let prefix = match &target.arch[..] {
666 "x86" => Some('_'),
667 "x86_64" => None,
668 "arm64ec" => Some('#'),
669 _ => return undecorated,
671 };
672
673 let (conv, args) = calling_convention_for_symbol(tcx, symbol);
674
675 let (prefix, suffix) = match conv {
678 Conv::X86Fastcall => ("@", "@"),
679 Conv::X86Stdcall => ("_", "@"),
680 Conv::X86VectorCall => ("", "@@"),
681 _ => {
682 if let Some(prefix) = prefix {
683 undecorated.insert(0, prefix);
684 }
685 return undecorated;
686 }
687 };
688
689 let args_in_bytes: u64 = args
690 .iter()
691 .map(|abi| abi.layout.size.bytes().next_multiple_of(target.pointer_width as u64 / 8))
692 .sum();
693 format!("{prefix}{undecorated}{suffix}{args_in_bytes}")
694}
695
696pub(crate) fn exporting_symbol_name_for_instance_in_crate<'tcx>(
697 tcx: TyCtxt<'tcx>,
698 symbol: ExportedSymbol<'tcx>,
699 cnum: CrateNum,
700) -> String {
701 let undecorated = symbol_name_for_instance_in_crate(tcx, symbol, cnum);
702 maybe_emutls_symbol_name(tcx, symbol, &undecorated).unwrap_or(undecorated)
703}
704
705pub(crate) fn extend_exported_symbols<'tcx>(
709 symbols: &mut Vec<String>,
710 tcx: TyCtxt<'tcx>,
711 symbol: ExportedSymbol<'tcx>,
712 instantiating_crate: CrateNum,
713) {
714 let (conv, _) = calling_convention_for_symbol(tcx, symbol);
715
716 if conv != Conv::GpuKernel || tcx.sess.target.os != "amdhsa" {
717 return;
718 }
719
720 let undecorated = symbol_name_for_instance_in_crate(tcx, symbol, instantiating_crate);
721
722 symbols.push(format!("{undecorated}.kd"));
724}
725
726fn maybe_emutls_symbol_name<'tcx>(
727 tcx: TyCtxt<'tcx>,
728 symbol: ExportedSymbol<'tcx>,
729 undecorated: &str,
730) -> Option<String> {
731 if matches!(tcx.sess.tls_model(), TlsModel::Emulated)
732 && let ExportedSymbol::NonGeneric(def_id) = symbol
733 && tcx.is_thread_local_static(def_id)
734 {
735 Some(format!("__emutls_v.{undecorated}"))
738 } else {
739 None
740 }
741}
742
743fn wasm_import_module_map(tcx: TyCtxt<'_>, cnum: CrateNum) -> DefIdMap<String> {
744 let native_libs = tcx.native_libraries(cnum);
748
749 let def_id_to_native_lib = native_libs
750 .iter()
751 .filter_map(|lib| lib.foreign_module.map(|id| (id, lib)))
752 .collect::<DefIdMap<_>>();
753
754 let mut ret = DefIdMap::default();
755 for (def_id, lib) in tcx.foreign_modules(cnum).iter() {
756 let module = def_id_to_native_lib.get(def_id).and_then(|s| s.wasm_import_module());
757 let Some(module) = module else { continue };
758 ret.extend(lib.foreign_items.iter().map(|id| {
759 assert_eq!(id.krate, cnum);
760 (*id, module.to_string())
761 }));
762 }
763
764 ret
765}