diff options
Diffstat (limited to 'compiler/rustc_codegen_ssa/src/back')
| -rw-r--r-- | compiler/rustc_codegen_ssa/src/back/link.rs | 137 | ||||
| -rw-r--r-- | compiler/rustc_codegen_ssa/src/back/link/raw_dylib.rs | 1 | ||||
| -rw-r--r-- | compiler/rustc_codegen_ssa/src/back/lto.rs | 11 | ||||
| -rw-r--r-- | compiler/rustc_codegen_ssa/src/back/metadata.rs | 2 | ||||
| -rw-r--r-- | compiler/rustc_codegen_ssa/src/back/symbol_export.rs | 22 | ||||
| -rw-r--r-- | compiler/rustc_codegen_ssa/src/back/write.rs | 18 |
6 files changed, 105 insertions, 86 deletions
diff --git a/compiler/rustc_codegen_ssa/src/back/link.rs b/compiler/rustc_codegen_ssa/src/back/link.rs index c5792da2678..168077260a6 100644 --- a/compiler/rustc_codegen_ssa/src/back/link.rs +++ b/compiler/rustc_codegen_ssa/src/back/link.rs @@ -3,10 +3,10 @@ mod raw_dylib; use std::collections::BTreeSet; use std::ffi::OsString; use std::fs::{File, OpenOptions, read}; -use std::io::{BufWriter, Write}; +use std::io::{BufReader, BufWriter, Write}; use std::ops::{ControlFlow, Deref}; use std::path::{Path, PathBuf}; -use std::process::{ExitStatus, Output, Stdio}; +use std::process::{Output, Stdio}; use std::{env, fmt, fs, io, mem, str}; use cc::windows_registry; @@ -68,6 +68,23 @@ pub fn ensure_removed(dcx: DiagCtxtHandle<'_>, path: &Path) { } } +fn check_link_info_print_request(sess: &Session, crate_types: &[CrateType]) { + let print_native_static_libs = + sess.opts.prints.iter().any(|p| p.kind == PrintKind::NativeStaticLibs); + let has_staticlib = crate_types.iter().any(|ct| *ct == CrateType::Staticlib); + if print_native_static_libs { + if !has_staticlib { + sess.dcx() + .warn(format!("cannot output linkage information without staticlib crate-type")); + sess.dcx() + .note(format!("consider `--crate-type staticlib` to print linkage information")); + } else if !sess.opts.output_types.should_link() { + sess.dcx() + .warn(format!("cannot output linkage information when --emit link is not passed")); + } + } +} + /// Performs the linkage portion of the compilation phase. This will generate all /// of the requested outputs for this compilation session. pub fn link_binary( @@ -167,6 +184,12 @@ pub fn link_binary( ); } + if sess.target.binary_format == BinaryFormat::Elf { + if let Err(err) = warn_if_linked_with_gold(sess, &out_filename) { + info!(?err, "Error while checking if gold was the linker"); + } + } + if output.is_stdout() { if output.is_tty() { sess.dcx().emit_err(errors::BinaryOutputToTty { @@ -180,6 +203,8 @@ pub fn link_binary( } } + check_link_info_print_request(sess, &codegen_results.crate_info.crate_types); + // Remove the temporary object file and metadata if we aren't saving temps. sess.time("link_binary_remove_temps", || { // If the user requests that temporaries are saved, don't delete any. @@ -717,13 +742,10 @@ fn link_natively( // Invoke the system linker info!("{cmd:?}"); - let retry_on_segfault = env::var("RUSTC_RETRY_LINKER_ON_SEGFAULT").is_ok(); let unknown_arg_regex = Regex::new(r"(unknown|unrecognized) (command line )?(option|argument)").unwrap(); let mut prog; - let mut i = 0; loop { - i += 1; prog = sess.time("run_linker", || exec_linker(sess, &cmd, out_filename, flavor, tmpdir)); let Ok(ref output) = prog else { break; @@ -839,54 +861,7 @@ fn link_natively( continue; } - // Here's a terribly awful hack that really shouldn't be present in any - // compiler. Here an environment variable is supported to automatically - // retry the linker invocation if the linker looks like it segfaulted. - // - // Gee that seems odd, normally segfaults are things we want to know - // about! Unfortunately though in rust-lang/rust#38878 we're - // experiencing the linker segfaulting on Travis quite a bit which is - // causing quite a bit of pain to land PRs when they spuriously fail - // due to a segfault. - // - // The issue #38878 has some more debugging information on it as well, - // but this unfortunately looks like it's just a race condition in - // macOS's linker with some thread pool working in the background. It - // seems that no one currently knows a fix for this so in the meantime - // we're left with this... - if !retry_on_segfault || i > 3 { - break; - } - let msg_segv = "clang: error: unable to execute command: Segmentation fault: 11"; - let msg_bus = "clang: error: unable to execute command: Bus error: 10"; - if out.contains(msg_segv) || out.contains(msg_bus) { - warn!( - ?cmd, %out, - "looks like the linker segfaulted when we tried to call it, \ - automatically retrying again", - ); - continue; - } - - if is_illegal_instruction(&output.status) { - warn!( - ?cmd, %out, status = %output.status, - "looks like the linker hit an illegal instruction when we \ - tried to call it, automatically retrying again.", - ); - continue; - } - - #[cfg(unix)] - fn is_illegal_instruction(status: &ExitStatus) -> bool { - use std::os::unix::prelude::*; - status.signal() == Some(libc::SIGILL) - } - - #[cfg(not(unix))] - fn is_illegal_instruction(_status: &ExitStatus) -> bool { - false - } + break; } match prog { @@ -1986,7 +1961,7 @@ fn add_post_link_args(cmd: &mut dyn Linker, sess: &Session, flavor: LinkerFlavor /// This method creates a synthetic object file, which contains undefined references to all symbols /// that are necessary for the linking. They are only present in symbol table but not actually /// used in any sections, so the linker will therefore pick relevant rlibs for linking, but -/// unused `#[no_mangle]` or `#[used]` can still be discard by GC sections. +/// unused `#[no_mangle]` or `#[used(compiler)]` can still be discard by GC sections. /// /// There's a few internal crates in the standard library (aka libcore and /// libstd) which actually have a circular dependence upon one another. This @@ -2020,7 +1995,8 @@ fn add_linked_symbol_object( if file.format() == object::BinaryFormat::MachO { // Divide up the sections into sub-sections via symbols for dead code stripping. - // Without this flag, unused `#[no_mangle]` or `#[used]` cannot be discard on MachO targets. + // Without this flag, unused `#[no_mangle]` or `#[used(compiler)]` cannot be + // discard on MachO targets. file.set_subsections_via_symbols(); } @@ -3406,3 +3382,54 @@ fn add_lld_args( } } } + +// gold has been deprecated with binutils 2.44 +// and is known to behave incorrectly around Rust programs. +// There have been reports of being unable to bootstrap with gold: +// https://github.com/rust-lang/rust/issues/139425 +// Additionally, gold miscompiles SHF_GNU_RETAIN sections, which are +// emitted with `#[used(linker)]`. +fn warn_if_linked_with_gold(sess: &Session, path: &Path) -> Result<(), Box<dyn std::error::Error>> { + use object::read::elf::{FileHeader, SectionHeader}; + use object::read::{ReadCache, ReadRef, Result}; + use object::{Endianness, elf}; + + fn elf_has_gold_version_note<'a>( + elf: &impl FileHeader, + data: impl ReadRef<'a>, + ) -> Result<bool> { + let endian = elf.endian()?; + + let section = + elf.sections(endian, data)?.section_by_name(endian, b".note.gnu.gold-version"); + if let Some((_, section)) = section { + if let Some(mut notes) = section.notes(endian, data)? { + return Ok(notes.any(|note| { + note.is_ok_and(|note| note.n_type(endian) == elf::NT_GNU_GOLD_VERSION) + })); + } + } + + Ok(false) + } + + let data = ReadCache::new(BufReader::new(File::open(path)?)); + + let was_linked_with_gold = if sess.target.pointer_width == 64 { + let elf = elf::FileHeader64::<Endianness>::parse(&data)?; + elf_has_gold_version_note(elf, &data)? + } else if sess.target.pointer_width == 32 { + let elf = elf::FileHeader32::<Endianness>::parse(&data)?; + elf_has_gold_version_note(elf, &data)? + } else { + return Ok(()); + }; + + if was_linked_with_gold { + let mut warn = + sess.dcx().struct_warn("the gold linker is deprecated and has known bugs with Rust"); + warn.help("consider using LLD or ld from GNU binutils instead"); + warn.emit(); + } + Ok(()) +} diff --git a/compiler/rustc_codegen_ssa/src/back/link/raw_dylib.rs b/compiler/rustc_codegen_ssa/src/back/link/raw_dylib.rs index 2c24378afe1..74f39022afb 100644 --- a/compiler/rustc_codegen_ssa/src/back/link/raw_dylib.rs +++ b/compiler/rustc_codegen_ssa/src/back/link/raw_dylib.rs @@ -287,6 +287,7 @@ fn create_elf_raw_dylib_stub(sess: &Session, soname: &str, symbols: &[DllImport] (Architecture::X86_64, None) => elf::EM_X86_64, (Architecture::X86_64_X32, None) => elf::EM_X86_64, (Architecture::Hexagon, None) => elf::EM_HEXAGON, + (Architecture::LoongArch32, None) => elf::EM_LOONGARCH, (Architecture::LoongArch64, None) => elf::EM_LOONGARCH, (Architecture::M68k, None) => elf::EM_68K, (Architecture::Mips, None) => elf::EM_MIPS, diff --git a/compiler/rustc_codegen_ssa/src/back/lto.rs b/compiler/rustc_codegen_ssa/src/back/lto.rs index 9fd984b6419..ce6fe8a191b 100644 --- a/compiler/rustc_codegen_ssa/src/back/lto.rs +++ b/compiler/rustc_codegen_ssa/src/back/lto.rs @@ -56,12 +56,7 @@ impl<B: WriteBackendMethods> LtoModuleCodegen<B> { } /// Optimize this module within the given codegen context. - /// - /// This function is unsafe as it'll return a `ModuleCodegen` still - /// points to LLVM data structures owned by this `LtoModuleCodegen`. - /// It's intended that the module returned is immediately code generated and - /// dropped, and then this LTO module is dropped. - pub unsafe fn optimize( + pub fn optimize( self, cgcx: &CodegenContext<B>, ) -> Result<ModuleCodegen<B::Module>, FatalError> { @@ -70,7 +65,7 @@ impl<B: WriteBackendMethods> LtoModuleCodegen<B> { B::optimize_fat(cgcx, &mut module)?; Ok(module) } - LtoModuleCodegen::Thin(thin) => unsafe { B::optimize_thin(cgcx, thin) }, + LtoModuleCodegen::Thin(thin) => B::optimize_thin(cgcx, thin), } } @@ -85,7 +80,7 @@ impl<B: WriteBackendMethods> LtoModuleCodegen<B> { } /// Run autodiff on Fat LTO module - pub unsafe fn autodiff( + pub fn autodiff( self, cgcx: &CodegenContext<B>, diff_fncs: Vec<AutoDiffItem>, diff --git a/compiler/rustc_codegen_ssa/src/back/metadata.rs b/compiler/rustc_codegen_ssa/src/back/metadata.rs index ec46c71b0e4..a16862c41ee 100644 --- a/compiler/rustc_codegen_ssa/src/back/metadata.rs +++ b/compiler/rustc_codegen_ssa/src/back/metadata.rs @@ -348,7 +348,7 @@ pub(super) fn elf_e_flags(architecture: Architecture, sess: &Session) -> u32 { e_flags } - Architecture::LoongArch64 => { + Architecture::LoongArch32 | Architecture::LoongArch64 => { // Source: https://github.com/loongson/la-abi-specs/blob/release/laelf.adoc#e_flags-identifies-abi-type-and-version let mut e_flags: u32 = elf::EF_LARCH_OBJABI_V1; diff --git a/compiler/rustc_codegen_ssa/src/back/symbol_export.rs b/compiler/rustc_codegen_ssa/src/back/symbol_export.rs index 96aec9769d2..92b9b6e132e 100644 --- a/compiler/rustc_codegen_ssa/src/back/symbol_export.rs +++ b/compiler/rustc_codegen_ssa/src/back/symbol_export.rs @@ -1,5 +1,6 @@ use std::collections::hash_map::Entry::*; +use rustc_abi::{CanonAbi, X86Call}; use rustc_ast::expand::allocator::{ALLOCATOR_METHODS, NO_ALLOC_SHIM_IS_UNSTABLE, global_fn_name}; use rustc_data_structures::unord::UnordMap; use rustc_hir::def::DefKind; @@ -14,7 +15,6 @@ use rustc_middle::ty::{self, GenericArgKind, GenericArgsRef, Instance, SymbolNam use rustc_middle::util::Providers; use rustc_session::config::{CrateType, OomStrategy}; use rustc_symbol_mangling::mangle_internal_symbol; -use rustc_target::callconv::Conv; use rustc_target::spec::{SanitizerSet, TlsModel}; use tracing::debug; @@ -128,7 +128,7 @@ fn reachable_non_generics_provider(tcx: TyCtxt<'_>, _: LocalCrate) -> DefIdMap<S } else { SymbolExportKind::Text }, - used: codegen_attrs.flags.contains(CodegenFnAttrFlags::USED) + used: codegen_attrs.flags.contains(CodegenFnAttrFlags::USED_COMPILER) || codegen_attrs.flags.contains(CodegenFnAttrFlags::USED_LINKER) || used, }; @@ -652,7 +652,7 @@ pub(crate) fn symbol_name_for_instance_in_crate<'tcx>( fn calling_convention_for_symbol<'tcx>( tcx: TyCtxt<'tcx>, symbol: ExportedSymbol<'tcx>, -) -> (Conv, &'tcx [rustc_target::callconv::ArgAbi<'tcx, Ty<'tcx>>]) { +) -> (CanonAbi, &'tcx [rustc_target::callconv::ArgAbi<'tcx, Ty<'tcx>>]) { let instance = match symbol { ExportedSymbol::NonGeneric(def_id) | ExportedSymbol::Generic(def_id, _) if tcx.is_static(def_id) => @@ -683,7 +683,7 @@ fn calling_convention_for_symbol<'tcx>( }) .map(|fnabi| (fnabi.conv, &fnabi.args[..])) // FIXME(workingjubilee): why don't we know the convention here? - .unwrap_or((Conv::Rust, &[])) + .unwrap_or((CanonAbi::Rust, &[])) } /// This is the symbol name of the given instance as seen by the linker. @@ -717,14 +717,14 @@ pub(crate) fn linking_symbol_name_for_instance_in_crate<'tcx>( _ => return undecorated, }; - let (conv, args) = calling_convention_for_symbol(tcx, symbol); + let (callconv, args) = calling_convention_for_symbol(tcx, symbol); // Decorate symbols with prefixes, suffixes and total number of bytes of arguments. // Reference: https://docs.microsoft.com/en-us/cpp/build/reference/decorated-names?view=msvc-170 - let (prefix, suffix) = match conv { - Conv::X86Fastcall => ("@", "@"), - Conv::X86Stdcall => ("_", "@"), - Conv::X86VectorCall => ("", "@@"), + let (prefix, suffix) = match callconv { + CanonAbi::X86(X86Call::Fastcall) => ("@", "@"), + CanonAbi::X86(X86Call::Stdcall) => ("_", "@"), + CanonAbi::X86(X86Call::Vectorcall) => ("", "@@"), _ => { if let Some(prefix) = prefix { undecorated.insert(0, prefix); @@ -758,9 +758,9 @@ pub(crate) fn extend_exported_symbols<'tcx>( symbol: ExportedSymbol<'tcx>, instantiating_crate: CrateNum, ) { - let (conv, _) = calling_convention_for_symbol(tcx, symbol); + let (callconv, _) = calling_convention_for_symbol(tcx, symbol); - if conv != Conv::GpuKernel || tcx.sess.target.os != "amdhsa" { + if callconv != CanonAbi::GpuKernel || tcx.sess.target.os != "amdhsa" { return; } diff --git a/compiler/rustc_codegen_ssa/src/back/write.rs b/compiler/rustc_codegen_ssa/src/back/write.rs index 0fd4ed8475b..a41ca8ce28b 100644 --- a/compiler/rustc_codegen_ssa/src/back/write.rs +++ b/compiler/rustc_codegen_ssa/src/back/write.rs @@ -383,7 +383,7 @@ pub struct CodegenContext<B: WriteBackendMethods> { pub coordinator_send: Sender<Box<dyn Any + Send>>, /// `true` if the codegen should be run in parallel. /// - /// Depends on [`CodegenBackend::supports_parallel()`] and `-Zno_parallel_backend`. + /// Depends on [`ExtraBackendMethods::supports_parallel()`] and `-Zno_parallel_backend`. pub parallel: bool, } @@ -416,8 +416,7 @@ fn generate_lto_work<B: ExtraBackendMethods>( B::run_fat_lto(cgcx, needs_fat_lto, import_only_modules).unwrap_or_else(|e| e.raise()); if cgcx.lto == Lto::Fat && !autodiff.is_empty() { let config = cgcx.config(ModuleKind::Regular); - module = - unsafe { module.autodiff(cgcx, autodiff, config).unwrap_or_else(|e| e.raise()) }; + module = module.autodiff(cgcx, autodiff, config).unwrap_or_else(|e| e.raise()); } // We are adding a single work item, so the cost doesn't matter. vec![(WorkItem::LTO(module), 0)] @@ -887,9 +886,7 @@ fn execute_optimize_work_item<B: ExtraBackendMethods>( let dcx = cgcx.create_dcx(); let dcx = dcx.handle(); - unsafe { - B::optimize(cgcx, dcx, &mut module, module_config)?; - } + B::optimize(cgcx, dcx, &mut module, module_config)?; // After we've done the initial round of optimizations we need to // decide whether to synchronously codegen this module or ship it @@ -1020,7 +1017,7 @@ fn execute_lto_work_item<B: ExtraBackendMethods>( module: lto::LtoModuleCodegen<B>, module_config: &ModuleConfig, ) -> Result<WorkItemResult<B>, FatalError> { - let module = unsafe { module.optimize(cgcx)? }; + let module = module.optimize(cgcx)?; finish_intra_module_work(cgcx, module, module_config) } @@ -1036,7 +1033,7 @@ fn finish_intra_module_work<B: ExtraBackendMethods>( || module.kind == ModuleKind::Metadata || module.kind == ModuleKind::Allocator { - let module = unsafe { B::codegen(cgcx, dcx, module, module_config)? }; + let module = B::codegen(cgcx, dcx, module, module_config)?; Ok(WorkItemResult::Finished(module)) } else { Ok(WorkItemResult::NeedsLink(module)) @@ -1725,9 +1722,8 @@ fn start_executing_work<B: ExtraBackendMethods>( let dcx = cgcx.create_dcx(); let dcx = dcx.handle(); let module = B::run_link(&cgcx, dcx, needs_link).map_err(|_| ())?; - let module = unsafe { - B::codegen(&cgcx, dcx, module, cgcx.config(ModuleKind::Regular)).map_err(|_| ())? - }; + let module = + B::codegen(&cgcx, dcx, module, cgcx.config(ModuleKind::Regular)).map_err(|_| ())?; compiled_modules.push(module); } |