From d662083a6c78928c70cc74b600205c246dab3bf6 Mon Sep 17 00:00:00 2001 From: Michael Woerister Date: Tue, 14 Aug 2018 17:55:22 +0200 Subject: [PATCH] Use CGU name as LLVM module name and add some caching to CGU name generation. --- src/librustc/mir/mono.rs | 166 ++++++++++-------- src/librustc_codegen_llvm/back/link.rs | 7 - src/librustc_codegen_llvm/back/lto.rs | 11 +- src/librustc_codegen_llvm/back/write.rs | 3 +- src/librustc_codegen_llvm/base.rs | 67 +++---- src/librustc_codegen_llvm/lib.rs | 4 +- .../assert_module_sources.rs | 10 +- src/librustc_mir/monomorphize/partitioning.rs | 108 +++++++++--- src/test/ui/lto-duplicate-symbols.stderr | 2 +- 9 files changed, 208 insertions(+), 170 deletions(-) diff --git a/src/librustc/mir/mono.rs b/src/librustc/mir/mono.rs index 823495e2d4d79..9d2f62bd03046 100644 --- a/src/librustc/mir/mono.rs +++ b/src/librustc/mir/mono.rs @@ -171,80 +171,6 @@ impl<'tcx> CodegenUnit<'tcx> { self.size_estimate = Some(size_estimate + delta); } } - - /// CGU names should fulfill the following requirements: - /// - They should be able to act as a file name on any kind of file system - /// - They should not collide with other CGU names, even for different versions - /// of the same crate. - /// - /// Consequently, we don't use special characters except for '.' and '-' and we - /// prefix each name with the crate-name and crate-disambiguator. - /// - /// This function will build CGU names of the form: - /// - /// ``` - /// .(-)*[.] - /// ``` - /// - /// The '.' before `` makes sure that names with a special - /// suffix can never collide with a name built out of regular Rust - /// identifiers (e.g. module paths). - pub fn build_cgu_name(tcx: TyCtxt, - cnum: CrateNum, - components: I, - special_suffix: Option) - -> InternedString - where I: IntoIterator, - C: fmt::Display, - S: fmt::Display, - { - let cgu_name = CodegenUnit::build_cgu_name_no_mangle(tcx, - cnum, - components, - special_suffix); - - if tcx.sess.opts.debugging_opts.human_readable_cgu_names { - cgu_name - } else { - let cgu_name = &cgu_name.as_str()[..]; - Symbol::intern(&CodegenUnit::mangle_name(cgu_name)).as_interned_str() - } - } - - /// Same as `CodegenUnit::build_cgu_name()` but will never mangle the - /// resulting name. - pub fn build_cgu_name_no_mangle(tcx: TyCtxt, - cnum: CrateNum, - components: I, - special_suffix: Option) - -> InternedString - where I: IntoIterator, - C: fmt::Display, - S: fmt::Display, - { - use std::fmt::Write; - - let mut cgu_name = String::with_capacity(64); - - // Start out with the crate name and disambiguator - write!(cgu_name, - "{}.{}", - tcx.crate_name(cnum), - tcx.crate_disambiguator(cnum)).unwrap(); - - // Add the components - for component in components { - write!(cgu_name, "-{}", component).unwrap(); - } - - if let Some(special_suffix) = special_suffix { - // We add a dot in here so it cannot clash with anything in a regular - // Rust identifier - write!(cgu_name, ".{}", special_suffix).unwrap(); - } - - Symbol::intern(&cgu_name[..]).as_interned_str() - } } impl<'a, 'tcx> HashStable> for CodegenUnit<'tcx> { @@ -314,3 +240,95 @@ impl Stats { self.fn_stats.extend(stats.fn_stats); } } + +pub struct CodegenUnitNameBuilder<'a, 'gcx: 'tcx, 'tcx: 'a> { + tcx: TyCtxt<'a, 'gcx, 'tcx>, + cache: FxHashMap, +} + +impl<'a, 'gcx: 'tcx, 'tcx: 'a> CodegenUnitNameBuilder<'a, 'gcx, 'tcx> { + + pub fn new(tcx: TyCtxt<'a, 'gcx, 'tcx>) -> Self { + CodegenUnitNameBuilder { + tcx, + cache: FxHashMap(), + } + } + + /// CGU names should fulfill the following requirements: + /// - They should be able to act as a file name on any kind of file system + /// - They should not collide with other CGU names, even for different versions + /// of the same crate. + /// + /// Consequently, we don't use special characters except for '.' and '-' and we + /// prefix each name with the crate-name and crate-disambiguator. + /// + /// This function will build CGU names of the form: + /// + /// ``` + /// .(-)*[.] + /// ``` + /// + /// The '.' before `` makes sure that names with a special + /// suffix can never collide with a name built out of regular Rust + /// identifiers (e.g. module paths). + pub fn build_cgu_name(&mut self, + cnum: CrateNum, + components: I, + special_suffix: Option) + -> InternedString + where I: IntoIterator, + C: fmt::Display, + S: fmt::Display, + { + let cgu_name = self.build_cgu_name_no_mangle(cnum, + components, + special_suffix); + + if self.tcx.sess.opts.debugging_opts.human_readable_cgu_names { + cgu_name + } else { + let cgu_name = &cgu_name.as_str()[..]; + Symbol::intern(&CodegenUnit::mangle_name(cgu_name)).as_interned_str() + } + } + + /// Same as `CodegenUnit::build_cgu_name()` but will never mangle the + /// resulting name. + pub fn build_cgu_name_no_mangle(&mut self, + cnum: CrateNum, + components: I, + special_suffix: Option) + -> InternedString + where I: IntoIterator, + C: fmt::Display, + S: fmt::Display, + { + use std::fmt::Write; + + let mut cgu_name = String::with_capacity(64); + + // Start out with the crate name and disambiguator + let tcx = self.tcx; + let crate_prefix = self.cache.entry(cnum).or_insert_with(|| { + let crate_disambiguator = format!("{}", tcx.crate_disambiguator(cnum)); + // Using a shortened disambiguator of about 40 bits + format!("{}.{}", tcx.crate_name(cnum), &crate_disambiguator[0 .. 8]) + }); + + write!(cgu_name, "{}", crate_prefix).unwrap(); + + // Add the components + for component in components { + write!(cgu_name, "-{}", component).unwrap(); + } + + if let Some(special_suffix) = special_suffix { + // We add a dot in here so it cannot clash with anything in a regular + // Rust identifier + write!(cgu_name, ".{}", special_suffix).unwrap(); + } + + Symbol::intern(&cgu_name[..]).as_interned_str() + } +} diff --git a/src/librustc_codegen_llvm/back/link.rs b/src/librustc_codegen_llvm/back/link.rs index bbe1ccf3696f4..37c99932f565c 100644 --- a/src/librustc_codegen_llvm/back/link.rs +++ b/src/librustc_codegen_llvm/back/link.rs @@ -46,13 +46,6 @@ use std::process::{Output, Stdio}; use std::str; use syntax::attr; -/// The LLVM module name containing crate-metadata. This includes a `.` on -/// purpose, so it cannot clash with the name of a user-defined module. -pub const METADATA_MODULE_NAME: &'static str = "crate.metadata"; - -// same as for metadata above, but for allocator shim -pub const ALLOCATOR_MODULE_NAME: &'static str = "crate.allocator"; - pub use rustc_codegen_utils::link::{find_crate_name, filename_for_input, default_output_for_target, invalid_output_for_target, build_link_meta, out_filename, check_file_is_writeable}; diff --git a/src/librustc_codegen_llvm/back/lto.rs b/src/librustc_codegen_llvm/back/lto.rs index d7741230327bb..56858a31efd25 100644 --- a/src/librustc_codegen_llvm/back/lto.rs +++ b/src/librustc_codegen_llvm/back/lto.rs @@ -242,7 +242,7 @@ fn fat_lto(cgcx: &CodegenContext, let llvm = module.llvm().expect("can't lto pre-codegened modules"); (&llvm.llcx, llvm.llmod()) }; - info!("using {:?} as a base module", module.llmod_id); + info!("using {:?} as a base module", module.name); // The linking steps below may produce errors and diagnostics within LLVM // which we'd like to handle and print, so set up our diagnostic handlers @@ -257,7 +257,7 @@ fn fat_lto(cgcx: &CodegenContext, for module in modules { let llvm = module.llvm().expect("can't lto pre-codegened modules"); let buffer = ModuleBuffer::new(llvm.llmod()); - let llmod_id = CString::new(&module.llmod_id[..]).unwrap(); + let llmod_id = CString::new(&module.name[..]).unwrap(); serialized_modules.push((SerializedModule::Local(buffer), llmod_id)); } @@ -384,9 +384,9 @@ fn thin_lto(diag_handler: &Handler, // the most expensive portion of this small bit of global // analysis! for (i, module) in modules.iter().enumerate() { - info!("local module: {} - {}", i, module.llmod_id); + info!("local module: {} - {}", i, module.name); let llvm = module.llvm().expect("can't lto precodegened module"); - let name = CString::new(module.llmod_id.clone()).unwrap(); + let name = CString::new(module.name.clone()).unwrap(); let buffer = ThinBuffer::new(llvm.llmod()); thin_modules.push(llvm::ThinLTOModule { identifier: name.as_ptr(), @@ -395,7 +395,7 @@ fn thin_lto(diag_handler: &Handler, }); thin_buffers.push(buffer); module_names.push(name); - timeline.record(&module.llmod_id); + timeline.record(&module.name); } // FIXME: All upstream crates are deserialized internally in the @@ -668,7 +668,6 @@ impl ThinModule { llcx, tm, }), - llmod_id: self.name().to_string(), name: self.name().to_string(), kind: ModuleKind::Regular, }; diff --git a/src/librustc_codegen_llvm/back/write.rs b/src/librustc_codegen_llvm/back/write.rs index d60983d7697b7..b62836ec255d4 100644 --- a/src/librustc_codegen_llvm/back/write.rs +++ b/src/librustc_codegen_llvm/back/write.rs @@ -728,7 +728,7 @@ unsafe fn codegen(cgcx: &CodegenContext, if config.emit_bc_compressed { let dst = bc_out.with_extension(RLIB_BYTECODE_EXTENSION); - let data = bytecode::encode(&module.llmod_id, data); + let data = bytecode::encode(&module.name, data); if let Err(e) = fs::write(&dst, data) { diag_handler.err(&format!("failed to write bytecode: {}", e)); } @@ -1338,7 +1338,6 @@ fn execute_work_item(cgcx: &CodegenContext, assert_eq!(bytecode_compressed.is_some(), config.emit_bc_compressed); Ok(WorkItemResult::Compiled(CompiledModule { - llmod_id: module.llmod_id.clone(), name: module_name, kind: ModuleKind::Regular, pre_existing: true, diff --git a/src/librustc_codegen_llvm/base.rs b/src/librustc_codegen_llvm/base.rs index 7ca6a89dd9b57..e626cc3870fe9 100644 --- a/src/librustc_codegen_llvm/base.rs +++ b/src/librustc_codegen_llvm/base.rs @@ -36,7 +36,7 @@ use metadata; use rustc::hir::def_id::{CrateNum, DefId, LOCAL_CRATE}; use rustc::middle::lang_items::StartFnLangItem; use rustc::middle::weak_lang_items; -use rustc::mir::mono::{Linkage, Visibility, Stats}; +use rustc::mir::mono::{Linkage, Visibility, Stats, CodegenUnitNameBuilder}; use rustc::middle::cstore::{EncodedMetadata}; use rustc::ty::{self, Ty, TyCtxt}; use rustc::ty::layout::{self, Align, TyLayout, LayoutOf}; @@ -742,19 +742,23 @@ pub fn codegen_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, let crate_hash = tcx.crate_hash(LOCAL_CRATE); let link_meta = link::build_link_meta(crate_hash); + let cgu_name_builder = &mut CodegenUnitNameBuilder::new(tcx); // Codegen the metadata. tcx.sess.profiler(|p| p.start_activity(ProfileCategory::Codegen)); - let llmod_id = "metadata"; - let metadata_llvm_module = ModuleLlvm::new(tcx.sess, llmod_id); + + let metadata_cgu_name = cgu_name_builder.build_cgu_name(LOCAL_CRATE, + &["crate"], + Some("metadata")).as_str() + .to_string(); + let metadata_llvm_module = ModuleLlvm::new(tcx.sess, &metadata_cgu_name); let metadata = time(tcx.sess, "write metadata", || { write_metadata(tcx, &metadata_llvm_module, &link_meta) }); tcx.sess.profiler(|p| p.end_activity(ProfileCategory::Codegen)); let metadata_module = ModuleCodegen { - name: link::METADATA_MODULE_NAME.to_string(), - llmod_id: llmod_id.to_string(), + name: metadata_cgu_name, source: ModuleSource::Codegened(metadata_llvm_module), kind: ModuleKind::Metadata, }; @@ -833,20 +837,22 @@ pub fn codegen_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, let allocator_module = if any_dynamic_crate { None } else if let Some(kind) = *tcx.sess.allocator_kind.get() { - unsafe { - let llmod_id = "allocator"; - let modules = ModuleLlvm::new(tcx.sess, llmod_id); - time(tcx.sess, "write allocator module", || { + let llmod_id = cgu_name_builder.build_cgu_name(LOCAL_CRATE, + &["crate"], + Some("allocator")).as_str() + .to_string(); + let modules = ModuleLlvm::new(tcx.sess, &llmod_id); + time(tcx.sess, "write allocator module", || { + unsafe { allocator::codegen(tcx, &modules, kind) - }); + } + }); - Some(ModuleCodegen { - name: link::ALLOCATOR_MODULE_NAME.to_string(), - llmod_id: llmod_id.to_string(), - source: ModuleSource::Codegened(modules), - kind: ModuleKind::Allocator, - }) - } + Some(ModuleCodegen { + name: llmod_id, + source: ModuleSource::Codegened(modules), + kind: ModuleKind::Allocator, + }) } else { None }; @@ -889,21 +895,10 @@ pub fn codegen_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, // succeed it means that none of the dependencies has changed // and we can safely re-use. if let Some(dep_node_index) = tcx.dep_graph.try_mark_green(tcx, dep_node) { - // Append ".rs" to LLVM module identifier. - // - // LLVM code generator emits a ".file filename" directive - // for ELF backends. Value of the "filename" is set as the - // LLVM module identifier. Due to a LLVM MC bug[1], LLVM - // crashes if the module identifier is same as other symbols - // such as a function name in the module. - // 1. http://llvm.org/bugs/show_bug.cgi?id=11479 - let llmod_id = format!("{}.rs", cgu.name()); - let module = ModuleCodegen { name: cgu.name().to_string(), source: ModuleSource::Preexisting(buf), kind: ModuleKind::Regular, - llmod_id, }; tcx.dep_graph.mark_loaded_from_cache(dep_node_index, true); write::submit_codegened_module_to_llvm(tcx, module, 0); @@ -1212,21 +1207,8 @@ fn compile_codegen_unit<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, { let cgu_name = cgu.name().to_string(); - // Append ".rs" to LLVM module identifier. - // - // LLVM code generator emits a ".file filename" directive - // for ELF backends. Value of the "filename" is set as the - // LLVM module identifier. Due to a LLVM MC bug[1], LLVM - // crashes if the module identifier is same as other symbols - // such as a function name in the module. - // 1. http://llvm.org/bugs/show_bug.cgi?id=11479 - let llmod_id = format!("{}-{}.rs", - cgu.name(), - tcx.crate_disambiguator(LOCAL_CRATE) - .to_fingerprint().to_hex()); - // Instantiate monomorphizations without filling out definitions yet... - let llvm_module = ModuleLlvm::new(tcx.sess, &llmod_id); + let llvm_module = ModuleLlvm::new(tcx.sess, &cgu_name); let stats = { let cx = CodegenCx::new(tcx, cgu, &llvm_module); let mono_items = cx.codegen_unit @@ -1282,7 +1264,6 @@ fn compile_codegen_unit<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, name: cgu_name, source: ModuleSource::Codegened(llvm_module), kind: ModuleKind::Regular, - llmod_id, }) } } diff --git a/src/librustc_codegen_llvm/lib.rs b/src/librustc_codegen_llvm/lib.rs index 390a1df02b88e..a65511a24af72 100644 --- a/src/librustc_codegen_llvm/lib.rs +++ b/src/librustc_codegen_llvm/lib.rs @@ -269,8 +269,8 @@ struct ModuleCodegen { /// unique amongst **all** crates. Therefore, it should contain /// something unique to this crate (e.g., a module path) as well /// as the crate name and disambiguator. + /// We currently generate these names via CodegenUnit::build_cgu_name(). name: String, - llmod_id: String, source: ModuleSource, kind: ModuleKind, } @@ -317,7 +317,6 @@ impl ModuleCodegen { }; CompiledModule { - llmod_id: self.llmod_id, name: self.name.clone(), kind: self.kind, pre_existing, @@ -331,7 +330,6 @@ impl ModuleCodegen { #[derive(Debug)] struct CompiledModule { name: String, - llmod_id: String, kind: ModuleKind, pre_existing: bool, object: Option, diff --git a/src/librustc_incremental/assert_module_sources.rs b/src/librustc_incremental/assert_module_sources.rs index f6e9ee7b22560..9b8e2c450d5f8 100644 --- a/src/librustc_incremental/assert_module_sources.rs +++ b/src/librustc_incremental/assert_module_sources.rs @@ -29,7 +29,7 @@ use rustc::hir::def_id::LOCAL_CRATE; use rustc::dep_graph::{DepNode, DepConstructor}; -use rustc::mir::mono::CodegenUnit; +use rustc::mir::mono::CodegenUnitNameBuilder; use rustc::ty::TyCtxt; use syntax::ast; use rustc::ich::{ATTR_PARTITION_REUSED, ATTR_PARTITION_CODEGENED}; @@ -94,10 +94,10 @@ impl<'a, 'tcx> AssertModuleSource<'a, 'tcx> { // Remove the crate name assert_eq!(cgu_path_components.remove(0), crate_name); - let cgu_name = CodegenUnit::build_cgu_name(self.tcx, - LOCAL_CRATE, - cgu_path_components, - cgu_special_suffix); + let cgu_name_builder = &mut CodegenUnitNameBuilder::new(self.tcx); + let cgu_name = cgu_name_builder.build_cgu_name(LOCAL_CRATE, + cgu_path_components, + cgu_special_suffix); debug!("mapping '{}' to cgu name '{}'", self.field(attr, MODULE), cgu_name); diff --git a/src/librustc_mir/monomorphize/partitioning.rs b/src/librustc_mir/monomorphize/partitioning.rs index 29b5771ee99bc..73d5d1d0948bf 100644 --- a/src/librustc_mir/monomorphize/partitioning.rs +++ b/src/librustc_mir/monomorphize/partitioning.rs @@ -105,9 +105,9 @@ use monomorphize::collector::InliningMap; use rustc::dep_graph::WorkProductId; use rustc::hir::CodegenFnAttrFlags; -use rustc::hir::def_id::{DefId, LOCAL_CRATE}; +use rustc::hir::def_id::{DefId, LOCAL_CRATE, CRATE_DEF_INDEX}; use rustc::hir::map::DefPathData; -use rustc::mir::mono::{Linkage, Visibility}; +use rustc::mir::mono::{Linkage, Visibility, CodegenUnitNameBuilder}; use rustc::middle::exported_symbols::SymbolExportLevel; use rustc::ty::{self, TyCtxt, InstanceDef}; use rustc::ty::item_path::characteristic_def_id_of_type; @@ -203,8 +203,8 @@ impl<'tcx> CodegenUnitExt<'tcx> for CodegenUnit<'tcx> { } // Anything we can't find a proper codegen unit for goes into this. -fn fallback_cgu_name(tcx: TyCtxt) -> InternedString { - CodegenUnit::build_cgu_name(tcx, LOCAL_CRATE, &["fallback"], Some("cgu")) +fn fallback_cgu_name(name_builder: &mut CodegenUnitNameBuilder) -> InternedString { + name_builder.build_cgu_name(LOCAL_CRATE, &["fallback"], Some("cgu")) } pub fn partition<'a, 'tcx, I>(tcx: TyCtxt<'a, 'tcx, 'tcx>, @@ -300,6 +300,9 @@ fn place_root_mono_items<'a, 'tcx, I>(tcx: TyCtxt<'a, 'tcx, 'tcx>, let export_generics = tcx.sess.opts.share_generics() && tcx.local_crate_exports_generics(); + let cgu_name_builder = &mut CodegenUnitNameBuilder::new(tcx); + let cgu_name_cache = &mut FxHashMap(); + for mono_item in mono_items { match mono_item.instantiation_mode(tcx) { InstantiationMode::GloballyShared { .. } => {} @@ -311,8 +314,12 @@ fn place_root_mono_items<'a, 'tcx, I>(tcx: TyCtxt<'a, 'tcx, 'tcx>, mono_item.is_generic_fn(); let codegen_unit_name = match characteristic_def_id { - Some(def_id) => compute_codegen_unit_name(tcx, def_id, is_volatile), - None => fallback_cgu_name(tcx), + Some(def_id) => compute_codegen_unit_name(tcx, + cgu_name_builder, + def_id, + is_volatile, + cgu_name_cache), + None => fallback_cgu_name(cgu_name_builder), }; let codegen_unit = codegen_units.entry(codegen_unit_name.clone()) @@ -336,7 +343,7 @@ fn place_root_mono_items<'a, 'tcx, I>(tcx: TyCtxt<'a, 'tcx, 'tcx>, // always ensure we have at least one CGU; otherwise, if we have a // crate with just types (for example), we could wind up with no CGU if codegen_units.is_empty() { - let codegen_unit_name = fallback_cgu_name(tcx); + let codegen_unit_name = fallback_cgu_name(cgu_name_builder); codegen_units.insert(codegen_unit_name.clone(), CodegenUnit::new(codegen_unit_name.clone())); } @@ -574,14 +581,15 @@ fn merge_codegen_units<'tcx>(tcx: TyCtxt<'_, 'tcx, 'tcx>, } } + let cgu_name_builder = &mut CodegenUnitNameBuilder::new(tcx); for (index, cgu) in codegen_units.iter_mut().enumerate() { - cgu.set_name(numbered_codegen_unit_name(tcx, index)); + cgu.set_name(numbered_codegen_unit_name(cgu_name_builder, index)); } } fn place_inlined_mono_items<'tcx>(initial_partitioning: PreInliningPartitioning<'tcx>, - inlining_map: &InliningMap<'tcx>) - -> PostInliningPartitioning<'tcx> { + inlining_map: &InliningMap<'tcx>) + -> PostInliningPartitioning<'tcx> { let mut new_partitioning = Vec::new(); let mut mono_item_placements = FxHashMap(); @@ -775,30 +783,72 @@ fn characteristic_def_id_of_mono_item<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, } } -fn compute_codegen_unit_name<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>, - def_id: DefId, - volatile: bool) - -> InternedString { - let def_path = tcx.def_path(def_id); - - let components = def_path.data.iter().take_while(|part| { - match part.data { - DefPathData::Module(..) => true, - _ => false, +type CguNameCache = FxHashMap<(DefId, bool), InternedString>; + +fn compute_codegen_unit_name(tcx: TyCtxt, + name_builder: &mut CodegenUnitNameBuilder, + def_id: DefId, + volatile: bool, + cache: &mut CguNameCache) + -> InternedString { + // Find the innermost module that is not nested within a function + let mut current_def_id = def_id; + let mut cgu_def_id = None; + // Walk backwards from the item we want to find the module for: + loop { + let def_key = tcx.def_key(current_def_id); + + match def_key.disambiguated_data.data { + DefPathData::Module(..) => { + if cgu_def_id.is_none() { + cgu_def_id = Some(current_def_id); + } + } + DefPathData::CrateRoot { .. } => { + if cgu_def_id.is_none() { + // If we have not found a module yet, take the crate root. + cgu_def_id = Some(DefId { + krate: def_id.krate, + index: CRATE_DEF_INDEX, + }); + } + break + } + _ => { + // If we encounter something that is not a module, throw away + // any module that we've found so far because we now know that + // it is nested within something else. + cgu_def_id = None; + } } - }).map(|part| part.data.as_interned_str()); - let volatile_suffix = if volatile { - Some("volatile") - } else { - None - }; + current_def_id.index = def_key.parent.unwrap(); + } + + let cgu_def_id = cgu_def_id.unwrap(); + + cache.entry((cgu_def_id, volatile)).or_insert_with(|| { + let def_path = tcx.def_path(cgu_def_id); + + let components = def_path + .data + .iter() + .map(|part| part.data.as_interned_str()); + + let volatile_suffix = if volatile { + Some("volatile") + } else { + None + }; - CodegenUnit::build_cgu_name(tcx, def_path.krate, components, volatile_suffix) + name_builder.build_cgu_name(def_path.krate, components, volatile_suffix) + }).clone() } -fn numbered_codegen_unit_name(tcx: TyCtxt, index: usize) -> InternedString { - CodegenUnit::build_cgu_name_no_mangle(tcx, LOCAL_CRATE, &["cgu"], Some(index)) +fn numbered_codegen_unit_name(name_builder: &mut CodegenUnitNameBuilder, + index: usize) + -> InternedString { + name_builder.build_cgu_name_no_mangle(LOCAL_CRATE, &["cgu"], Some(index)) } fn debug_dump<'a, 'b, 'tcx, I>(tcx: TyCtxt<'a, 'tcx, 'tcx>, diff --git a/src/test/ui/lto-duplicate-symbols.stderr b/src/test/ui/lto-duplicate-symbols.stderr index 2f0e57199bbc2..5760cb9a8fdb6 100644 --- a/src/test/ui/lto-duplicate-symbols.stderr +++ b/src/test/ui/lto-duplicate-symbols.stderr @@ -1,6 +1,6 @@ warning: Linking globals named 'foo': symbol multiply defined! -error: failed to load bc of "lto_duplicate_symbols10-8787f43e282added376259c1adb08b80.rs": +error: failed to load bc of "lto_duplicate_symbols1.3a1fbbbh-cgu.0": error: aborting due to previous error