diff options
Diffstat (limited to 'compiler/rustc_codegen_ssa')
24 files changed, 646 insertions, 682 deletions
diff --git a/compiler/rustc_codegen_ssa/Cargo.toml b/compiler/rustc_codegen_ssa/Cargo.toml index 46d6344db..d868e3d56 100644 --- a/compiler/rustc_codegen_ssa/Cargo.toml +++ b/compiler/rustc_codegen_ssa/Cargo.toml @@ -26,7 +26,6 @@ rustc_arena = { path = "../rustc_arena" } rustc_ast = { path = "../rustc_ast" } rustc_span = { path = "../rustc_span" } rustc_middle = { path = "../rustc_middle" } -rustc_apfloat = { path = "../rustc_apfloat" } rustc_attr = { path = "../rustc_attr" } rustc_symbol_mangling = { path = "../rustc_symbol_mangling" } rustc_data_structures = { path = "../rustc_data_structures" } diff --git a/compiler/rustc_codegen_ssa/src/back/archive.rs b/compiler/rustc_codegen_ssa/src/back/archive.rs index 0d2aa483d..bb76ca5d2 100644 --- a/compiler/rustc_codegen_ssa/src/back/archive.rs +++ b/compiler/rustc_codegen_ssa/src/back/archive.rs @@ -1,44 +1,16 @@ +use rustc_data_structures::fx::FxHashSet; +use rustc_data_structures::memmap::Mmap; use rustc_session::cstore::DllImport; use rustc_session::Session; +use rustc_span::symbol::Symbol; +use object::read::archive::ArchiveFile; + +use std::fmt::Display; +use std::fs::File; use std::io; use std::path::{Path, PathBuf}; -pub(super) fn find_library( - name: &str, - verbatim: bool, - search_paths: &[PathBuf], - sess: &Session, -) -> PathBuf { - // On Windows, static libraries sometimes show up as libfoo.a and other - // times show up as foo.lib - let oslibname = if verbatim { - name.to_string() - } else { - format!("{}{}{}", sess.target.staticlib_prefix, name, sess.target.staticlib_suffix) - }; - let unixlibname = format!("lib{}.a", name); - - for path in search_paths { - debug!("looking for {} inside {:?}", name, path); - let test = path.join(&oslibname); - if test.exists() { - return test; - } - if oslibname != unixlibname { - let test = path.join(&unixlibname); - if test.exists() { - return test; - } - } - } - sess.fatal(&format!( - "could not find native static library `{}`, \ - perhaps an -L flag is missing?", - name - )); -} - pub trait ArchiveBuilderBuilder { fn new_archive_builder<'a>(&self, sess: &'a Session) -> Box<dyn ArchiveBuilder<'a> + 'a>; @@ -53,7 +25,38 @@ pub trait ArchiveBuilderBuilder { lib_name: &str, dll_imports: &[DllImport], tmpdir: &Path, + is_direct_dependency: bool, ) -> PathBuf; + + fn extract_bundled_libs( + &self, + rlib: &Path, + outdir: &Path, + bundled_lib_file_names: &FxHashSet<Symbol>, + ) -> Result<(), String> { + let message = |msg: &str, e: &dyn Display| format!("{} '{}': {}", msg, &rlib.display(), e); + let archive_map = unsafe { + Mmap::map(File::open(rlib).map_err(|e| message("failed to open file", &e))?) + .map_err(|e| message("failed to mmap file", &e))? + }; + let archive = ArchiveFile::parse(&*archive_map) + .map_err(|e| message("failed to parse archive", &e))?; + + for entry in archive.members() { + let entry = entry.map_err(|e| message("failed to read entry", &e))?; + let data = entry + .data(&*archive_map) + .map_err(|e| message("failed to get data from archive member", &e))?; + let name = std::str::from_utf8(entry.name()) + .map_err(|e| message("failed to convert name", &e))?; + if !bundled_lib_file_names.contains(&Symbol::intern(name)) { + continue; // We need to extract only native libraries. + } + std::fs::write(&outdir.join(&name), data) + .map_err(|e| message("failed to write file", &e))?; + } + Ok(()) + } } pub trait ArchiveBuilder<'a> { diff --git a/compiler/rustc_codegen_ssa/src/back/link.rs b/compiler/rustc_codegen_ssa/src/back/link.rs index 63207803e..6cce95427 100644 --- a/compiler/rustc_codegen_ssa/src/back/link.rs +++ b/compiler/rustc_codegen_ssa/src/back/link.rs @@ -1,11 +1,13 @@ use rustc_arena::TypedArena; use rustc_ast::CRATE_NODE_ID; -use rustc_data_structures::fx::{FxHashSet, FxIndexMap}; +use rustc_data_structures::fx::FxHashSet; +use rustc_data_structures::fx::FxIndexMap; use rustc_data_structures::memmap::Mmap; use rustc_data_structures::temp_dir::MaybeTempDir; use rustc_errors::{ErrorGuaranteed, Handler}; use rustc_fs_util::fix_windows_verbatim_for_gcc; use rustc_hir::def_id::CrateNum; +use rustc_metadata::find_native_static_library; use rustc_metadata::fs::{emit_metadata, METADATA_FILENAME}; use rustc_middle::middle::dependency_format::Linkage; use rustc_middle::middle::exported_symbols::SymbolExportKind; @@ -20,11 +22,11 @@ use rustc_session::utils::NativeLibKind; use rustc_session::{filesearch, Session}; use rustc_span::symbol::Symbol; use rustc_span::DebuggerVisualizerFile; -use rustc_target::spec::crt_objects::{CrtObjects, CrtObjectsFallback}; +use rustc_target::spec::crt_objects::{CrtObjects, LinkSelfContainedDefault}; use rustc_target::spec::{LinkOutputKind, LinkerFlavor, LldFlavor, SplitDebuginfo}; use rustc_target::spec::{PanicStrategy, RelocModel, RelroLevel, SanitizerSet, Target}; -use super::archive::{find_library, ArchiveBuilder, ArchiveBuilderBuilder}; +use super::archive::{ArchiveBuilder, ArchiveBuilderBuilder}; use super::command::Command; use super::linker::{self, Linker}; use super::metadata::{create_rmeta_file, MetadataPosition}; @@ -44,7 +46,7 @@ use std::io::{BufWriter, Write}; use std::ops::Deref; use std::path::{Path, PathBuf}; use std::process::{ExitStatus, Output, Stdio}; -use std::{ascii, char, env, fmt, fs, io, mem, str}; +use std::{env, fmt, fs, io, mem, str}; pub fn ensure_removed(diag_handler: &Handler, path: &Path) { if let Err(e) = fs::remove_file(path) { @@ -307,6 +309,9 @@ fn link_rlib<'a>( } } + // Used if packed_bundled_libs flag enabled. + let mut packed_bundled_libs = Vec::new(); + // Note that in this loop we are ignoring the value of `lib.cfg`. That is, // we may not be configured to actually include a static library if we're // adding it here. That's because later when we consume this rlib we'll @@ -326,6 +331,8 @@ fn link_rlib<'a>( for lib in codegen_results.crate_info.used_libraries.iter() { match lib.kind { NativeLibKind::Static { bundle: None | Some(true), whole_archive: Some(true) } + if flavor == RlibFlavor::Normal && sess.opts.unstable_opts.packed_bundled_libs => {} + NativeLibKind::Static { bundle: None | Some(true), whole_archive: Some(true) } if flavor == RlibFlavor::Normal => { // Don't allow mixing +bundle with +whole_archive since an rlib may contain @@ -348,7 +355,16 @@ fn link_rlib<'a>( } if let Some(name) = lib.name { let location = - find_library(name.as_str(), lib.verbatim.unwrap_or(false), &lib_search_paths, sess); + find_native_static_library(name.as_str(), lib.verbatim, &lib_search_paths, sess); + if sess.opts.unstable_opts.packed_bundled_libs && flavor == RlibFlavor::Normal { + packed_bundled_libs.push(find_native_static_library( + lib.filename.unwrap().as_str(), + Some(true), + &lib_search_paths, + sess, + )); + continue; + } ab.add_archive(&location, Box::new(|_| false)).unwrap_or_else(|e| { sess.fatal(&format!( "failed to add native library {}: {}", @@ -360,13 +376,14 @@ fn link_rlib<'a>( } for (raw_dylib_name, raw_dylib_imports) in - collate_raw_dylibs(sess, &codegen_results.crate_info.used_libraries)? + collate_raw_dylibs(sess, codegen_results.crate_info.used_libraries.iter())? { let output_path = archive_builder_builder.create_dll_import_lib( sess, &raw_dylib_name, &raw_dylib_imports, tmpdir.as_ref(), + true, ); ab.add_archive(&output_path, Box::new(|_| false)).unwrap_or_else(|e| { @@ -403,6 +420,12 @@ fn link_rlib<'a>( ab.add_file(&trailing_metadata); } + // Add all bundled static native library dependencies. + // Archives added to the end of .rlib archive, see comment above for the reason. + for lib in packed_bundled_libs { + ab.add_file(&lib) + } + return Ok(ab); } @@ -412,9 +435,9 @@ fn link_rlib<'a>( /// then the CodegenResults value contains one NativeLib instance for each block. However, the /// linker appears to expect only a single import library for each library used, so we need to /// collate the symbols together by library name before generating the import libraries. -fn collate_raw_dylibs( - sess: &Session, - used_libraries: &[NativeLib], +fn collate_raw_dylibs<'a, 'b>( + sess: &'a Session, + used_libraries: impl IntoIterator<Item = &'b NativeLib>, ) -> Result<Vec<(String, Vec<DllImport>)>, ErrorGuaranteed> { // Use index maps to preserve original order of imports and libraries. let mut dylib_table = FxIndexMap::<String, FxIndexMap<Symbol, &DllImport>>::default(); @@ -552,14 +575,6 @@ fn link_staticlib<'a>( Ok(()) } -fn escape_stdout_stderr_string(s: &[u8]) -> String { - str::from_utf8(s).map(|s| s.to_owned()).unwrap_or_else(|_| { - let mut x = "Non-UTF-8 output: ".to_string(); - x.extend(s.iter().flat_map(|&b| ascii::escape_default(b)).map(char::from)); - x - }) -} - /// Use `thorin` (rust implementation of a dwarf packaging utility) to link DWARF objects into a /// DWARF package. fn link_dwarf_object<'a>( @@ -764,15 +779,15 @@ fn link_natively<'a>( "Linker does not support -static-pie command line option. Retrying with -static instead." ); // Mirror `add_(pre,post)_link_objects` to replace CRT objects. - let self_contained = crt_objects_fallback(sess, crate_type); + let self_contained = self_contained(sess, crate_type); let opts = &sess.target; let pre_objects = if self_contained { - &opts.pre_link_objects_fallback + &opts.pre_link_objects_self_contained } else { &opts.pre_link_objects }; let post_objects = if self_contained { - &opts.post_link_objects_fallback + &opts.post_link_objects_self_contained } else { &opts.post_link_objects }; @@ -866,7 +881,7 @@ fn link_natively<'a>( if !prog.status.success() { let mut output = prog.stderr.clone(); output.extend_from_slice(&prog.stdout); - let escaped_output = escape_stdout_stderr_string(&output); + let escaped_output = escape_string(&output); let mut err = sess.struct_err(&format!( "linking with `{}` failed: {}", linker_path.display(), @@ -934,8 +949,8 @@ fn link_natively<'a>( sess.abort_if_errors(); } - info!("linker stderr:\n{}", escape_stdout_stderr_string(&prog.stderr)); - info!("linker stdout:\n{}", escape_stdout_stderr_string(&prog.stdout)); + info!("linker stderr:\n{}", escape_string(&prog.stderr)); + info!("linker stdout:\n{}", escape_string(&prog.stdout)); } Err(e) => { let linker_not_found = e.kind() == io::ErrorKind::NotFound; @@ -1065,11 +1080,10 @@ fn strip_symbols_in_osx<'a>(sess: &'a Session, out_filename: &Path, option: Opti } fn escape_string(s: &[u8]) -> String { - str::from_utf8(s).map(|s| s.to_owned()).unwrap_or_else(|_| { - let mut x = "Non-UTF-8 output: ".to_string(); - x.extend(s.iter().flat_map(|&b| ascii::escape_default(b)).map(char::from)); - x - }) + match str::from_utf8(s) { + Ok(s) => s.to_owned(), + Err(_) => format!("Non-UTF-8 output: {}", s.escape_ascii()), + } } fn add_sanitizer_libraries(sess: &Session, crate_type: CrateType, linker: &mut dyn Linker) { @@ -1173,13 +1187,6 @@ pub fn linker_and_flavor(sess: &Session) -> (PathBuf, LinkerFlavor) { // only the linker flavor is known; use the default linker for the selected flavor (None, Some(flavor)) => Some(( PathBuf::from(match flavor { - LinkerFlavor::Em => { - if cfg!(windows) { - "emcc.bat" - } else { - "emcc" - } - } LinkerFlavor::Gcc => { if cfg!(any(target_os = "solaris", target_os = "illumos")) { // On historical Solaris systems, "cc" may have @@ -1194,11 +1201,17 @@ pub fn linker_and_flavor(sess: &Session) -> (PathBuf, LinkerFlavor) { } } LinkerFlavor::Ld => "ld", - LinkerFlavor::Msvc => "link.exe", LinkerFlavor::Lld(_) => "lld", - LinkerFlavor::PtxLinker => "rust-ptx-linker", - LinkerFlavor::BpfLinker => "bpf-linker", - LinkerFlavor::L4Bender => "l4-bender", + LinkerFlavor::Msvc => "link.exe", + LinkerFlavor::EmCc => { + if cfg!(windows) { + "emcc.bat" + } else { + "emcc" + } + } + LinkerFlavor::Bpf => "bpf-linker", + LinkerFlavor::Ptx => "rust-ptx-linker", }), flavor, )), @@ -1208,7 +1221,7 @@ pub fn linker_and_flavor(sess: &Session) -> (PathBuf, LinkerFlavor) { }); let flavor = if stem == "emcc" { - LinkerFlavor::Em + LinkerFlavor::EmCc } else if stem == "gcc" || stem.ends_with("-gcc") || stem == "clang" @@ -1236,7 +1249,8 @@ pub fn linker_and_flavor(sess: &Session) -> (PathBuf, LinkerFlavor) { // linker and linker flavor specified via command line have precedence over what the target // specification specifies - if let Some(ret) = infer_from(sess, sess.opts.cg.linker.clone(), sess.opts.cg.linker_flavor) { + let linker_flavor = sess.opts.cg.linker_flavor.map(LinkerFlavor::from_cli); + if let Some(ret) = infer_from(sess, sess.opts.cg.linker.clone(), linker_flavor) { return ret; } @@ -1556,26 +1570,26 @@ fn detect_self_contained_mingw(sess: &Session) -> bool { true } -/// Whether we link to our own CRT objects instead of relying on gcc to pull them. +/// Various toolchain components used during linking are used from rustc distribution +/// instead of being found somewhere on the host system. /// We only provide such support for a very limited number of targets. -fn crt_objects_fallback(sess: &Session, crate_type: CrateType) -> bool { +fn self_contained(sess: &Session, crate_type: CrateType) -> bool { if let Some(self_contained) = sess.opts.cg.link_self_contained { return self_contained; } - match sess.target.crt_objects_fallback { + match sess.target.link_self_contained { + LinkSelfContainedDefault::False => false, + LinkSelfContainedDefault::True => true, // FIXME: Find a better heuristic for "native musl toolchain is available", // based on host and linker path, for example. // (https://github.com/rust-lang/rust/pull/71769#issuecomment-626330237). - Some(CrtObjectsFallback::Musl) => sess.crt_static(Some(crate_type)), - Some(CrtObjectsFallback::Mingw) => { + LinkSelfContainedDefault::Musl => sess.crt_static(Some(crate_type)), + LinkSelfContainedDefault::Mingw => { sess.host == sess.target && sess.target.vendor != "uwp" && detect_self_contained_mingw(&sess) } - // FIXME: Figure out cases in which WASM needs to link with a native toolchain. - Some(CrtObjectsFallback::Wasm) => true, - None => false, } } @@ -1583,12 +1597,21 @@ fn crt_objects_fallback(sess: &Session, crate_type: CrateType) -> bool { fn add_pre_link_objects( cmd: &mut dyn Linker, sess: &Session, + flavor: LinkerFlavor, link_output_kind: LinkOutputKind, self_contained: bool, ) { + // FIXME: we are currently missing some infra here (per-linker-flavor CRT objects), + // so Fuchsia has to be special-cased. let opts = &sess.target; - let objects = - if self_contained { &opts.pre_link_objects_fallback } else { &opts.pre_link_objects }; + let empty = Default::default(); + let objects = if self_contained { + &opts.pre_link_objects_self_contained + } else if !(sess.target.os == "fuchsia" && flavor == LinkerFlavor::Gcc) { + &opts.pre_link_objects + } else { + &empty + }; for obj in objects.get(&link_output_kind).iter().copied().flatten() { cmd.add_object(&get_object_file_path(sess, obj, self_contained)); } @@ -1601,9 +1624,11 @@ fn add_post_link_objects( link_output_kind: LinkOutputKind, self_contained: bool, ) { - let opts = &sess.target; - let objects = - if self_contained { &opts.post_link_objects_fallback } else { &opts.post_link_objects }; + let objects = if self_contained { + &sess.target.post_link_objects_self_contained + } else { + &sess.target.post_link_objects + }; for obj in objects.get(&link_output_kind).iter().copied().flatten() { cmd.add_object(&get_object_file_path(sess, obj, self_contained)); } @@ -1703,6 +1728,13 @@ fn add_post_link_args(cmd: &mut dyn Linker, sess: &Session, flavor: LinkerFlavor /// 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. +/// +/// There's a few internal crates in the standard library (aka libcore and +/// libstd) which actually have a circular dependence upon one another. This +/// currently arises through "weak lang items" where libcore requires things +/// like `rust_begin_unwind` but libstd ends up defining it. To get this +/// circular dependence to work correctly we declare some of these things +/// in this synthetic object. fn add_linked_symbol_object( cmd: &mut dyn Linker, sess: &Session, @@ -1882,12 +1914,12 @@ fn linker_with_args<'a>( out_filename: &Path, codegen_results: &CodegenResults, ) -> Result<Command, ErrorGuaranteed> { - let crt_objects_fallback = crt_objects_fallback(sess, crate_type); + let self_contained = self_contained(sess, crate_type); let cmd = &mut *super::linker::get_linker( sess, path, flavor, - crt_objects_fallback, + self_contained, &codegen_results.crate_info.target_cpu, ); let link_output_kind = link_output_kind(sess, crate_type); @@ -1914,7 +1946,7 @@ fn linker_with_args<'a>( // ------------ Object code and libraries, order-dependent ------------ // Pre-link CRT objects. - add_pre_link_objects(cmd, sess, link_output_kind, crt_objects_fallback); + add_pre_link_objects(cmd, sess, flavor, link_output_kind, self_contained); add_linked_symbol_object( cmd, @@ -1947,7 +1979,6 @@ fn linker_with_args<'a>( // Upstream rust libraries are not supposed to depend on our local native // libraries as that would violate the structure of the DAG, in that // scenario they are required to link to them as well in a shared fashion. - // (The current implementation still doesn't prevent it though, see the FIXME below.) // // Note that upstream rust libraries may contain native dependencies as // well, but they also can't depend on what we just started to add to the @@ -1968,15 +1999,16 @@ fn linker_with_args<'a>( // and move this option back to the top. cmd.add_as_needed(); - // FIXME: Move this below to other native libraries - // (or alternatively link all native libraries after their respective crates). - // This change is somewhat breaking in practice due to local static libraries being linked - // as whole-archive (#85144), so removing whole-archive may be a pre-requisite. + // Local native libraries of all kinds. + // + // If `-Zlink-native-libraries=false` is set, then the assumption is that an + // external build system already has the native dependencies defined, and it + // will provide them to the linker itself. if sess.opts.unstable_opts.link_native_libraries { add_local_native_libraries(cmd, sess, codegen_results); } - // Upstream rust libraries and their non-bundled static libraries + // Upstream rust libraries and their (possibly bundled) static native libraries. add_upstream_rust_crates( cmd, sess, @@ -1986,24 +2018,54 @@ fn linker_with_args<'a>( tmpdir, ); - // Upstream dynamic native libraries linked with `#[link]` attributes at and `-l` - // command line options. - // If -Zlink-native-libraries=false is set, then the assumption is that an - // external build system already has the native dependencies defined, and it - // will provide them to the linker itself. + // Dynamic native libraries from upstream crates. + // + // FIXME: Merge this to `add_upstream_rust_crates` so that all native libraries are linked + // together with their respective upstream crates, and in their originally specified order. + // This may be slightly breaking due to our use of `--as-needed` and needs a crater run. if sess.opts.unstable_opts.link_native_libraries { add_upstream_native_libraries(cmd, sess, codegen_results); } // Link with the import library generated for any raw-dylib functions. for (raw_dylib_name, raw_dylib_imports) in - collate_raw_dylibs(sess, &codegen_results.crate_info.used_libraries)? + collate_raw_dylibs(sess, codegen_results.crate_info.used_libraries.iter())? { cmd.add_object(&archive_builder_builder.create_dll_import_lib( sess, &raw_dylib_name, &raw_dylib_imports, tmpdir, + true, + )); + } + // As with add_upstream_native_libraries, we need to add the upstream raw-dylib symbols in case + // they are used within inlined functions or instantiated generic functions. We do this *after* + // handling the raw-dylib symbols in the current crate to make sure that those are chosen first + // by the linker. + let (_, dependency_linkage) = codegen_results + .crate_info + .dependency_formats + .iter() + .find(|(ty, _)| *ty == crate_type) + .expect("failed to find crate type in dependency format list"); + let native_libraries_from_nonstatics = codegen_results + .crate_info + .native_libraries + .iter() + .filter_map(|(cnum, libraries)| { + (dependency_linkage[cnum.as_usize() - 1] != Linkage::Static).then(|| libraries) + }) + .flatten(); + for (raw_dylib_name, raw_dylib_imports) in + collate_raw_dylibs(sess, native_libraries_from_nonstatics)? + { + cmd.add_object(&archive_builder_builder.create_dll_import_lib( + sess, + &raw_dylib_name, + &raw_dylib_imports, + tmpdir, + false, )); } @@ -2024,7 +2086,7 @@ fn linker_with_args<'a>( cmd, sess, link_output_kind, - crt_objects_fallback, + self_contained, flavor, crate_type, codegen_results, @@ -2040,7 +2102,7 @@ fn linker_with_args<'a>( // ------------ Object code and libraries, order-dependent ------------ // Post-link CRT objects. - add_post_link_objects(cmd, sess, link_output_kind, crt_objects_fallback); + add_post_link_objects(cmd, sess, link_output_kind, self_contained); // ------------ Late order-dependent options ------------ @@ -2057,7 +2119,7 @@ fn add_order_independent_options( cmd: &mut dyn Linker, sess: &Session, link_output_kind: LinkOutputKind, - crt_objects_fallback: bool, + self_contained: bool, flavor: LinkerFlavor, crate_type: CrateType, codegen_results: &CodegenResults, @@ -2070,7 +2132,10 @@ fn add_order_independent_options( add_link_script(cmd, sess, tmpdir, crate_type); - if sess.target.os == "fuchsia" && crate_type == CrateType::Executable { + if sess.target.os == "fuchsia" + && crate_type == CrateType::Executable + && flavor != LinkerFlavor::Gcc + { let prefix = if sess.opts.unstable_opts.sanitizer.contains(SanitizerSet::ADDRESS) { "asan/" } else { @@ -2086,7 +2151,7 @@ fn add_order_independent_options( // Make the binary compatible with data execution prevention schemes. cmd.add_no_exec(); - if crt_objects_fallback { + if self_contained { cmd.no_crt_objects(); } @@ -2099,11 +2164,11 @@ fn add_order_independent_options( }); } - if flavor == LinkerFlavor::PtxLinker { + if flavor == LinkerFlavor::Ptx { // Provide the linker with fallback to internal `target-cpu`. cmd.arg("--fallback-arch"); cmd.arg(&codegen_results.crate_info.target_cpu); - } else if flavor == LinkerFlavor::BpfLinker { + } else if flavor == LinkerFlavor::Bpf { cmd.arg("--cpu"); cmd.arg(&codegen_results.crate_info.target_cpu); cmd.arg("--cpu-features"); @@ -2115,7 +2180,7 @@ fn add_order_independent_options( cmd.linker_plugin_lto(); - add_library_search_dirs(cmd, sess, crt_objects_fallback); + add_library_search_dirs(cmd, sess, self_contained); cmd.output_filename(out_filename); @@ -2319,72 +2384,25 @@ fn add_upstream_rust_crates<'a>( // crates. let deps = &codegen_results.crate_info.used_crates; - // There's a few internal crates in the standard library (aka libcore and - // libstd) which actually have a circular dependence upon one another. This - // currently arises through "weak lang items" where libcore requires things - // like `rust_begin_unwind` but libstd ends up defining it. To get this - // circular dependence to work correctly in all situations we'll need to be - // sure to correctly apply the `--start-group` and `--end-group` options to - // GNU linkers, otherwise if we don't use any other symbol from the standard - // library it'll get discarded and the whole application won't link. - // - // In this loop we're calculating the `group_end`, after which crate to - // pass `--end-group` and `group_start`, before which crate to pass - // `--start-group`. We currently do this by passing `--end-group` after - // the first crate (when iterating backwards) that requires a lang item - // defined somewhere else. Once that's set then when we've defined all the - // necessary lang items we'll pass `--start-group`. - // - // Note that this isn't amazing logic for now but it should do the trick - // for the current implementation of the standard library. - let mut group_end = None; - let mut group_start = None; - // Crates available for linking thus far. - let mut available = FxHashSet::default(); - // Crates required to satisfy dependencies discovered so far. - let mut required = FxHashSet::default(); - - let info = &codegen_results.crate_info; - for &cnum in deps.iter().rev() { - if let Some(missing) = info.missing_lang_items.get(&cnum) { - let missing_crates = missing.iter().map(|i| info.lang_item_to_crate.get(i).copied()); - required.extend(missing_crates); - } - - required.insert(Some(cnum)); - available.insert(Some(cnum)); - - if required.len() > available.len() && group_end.is_none() { - group_end = Some(cnum); - } - if required.len() == available.len() && group_end.is_some() { - group_start = Some(cnum); - break; - } - } - - // If we didn't end up filling in all lang items from upstream crates then - // we'll be filling it in with our crate. This probably means we're the - // standard library itself, so skip this for now. - if group_end.is_some() && group_start.is_none() { - group_end = None; - } - let mut compiler_builtins = None; let search_path = OnceCell::new(); for &cnum in deps.iter() { - if group_start == Some(cnum) { - cmd.group_start(); - } - // We may not pass all crates through to the linker. Some crates may // appear statically in an existing dylib, meaning we'll pick up all the // symbols from the dylib. let src = &codegen_results.crate_info.used_crate_source[&cnum]; match data[cnum.as_usize() - 1] { _ if codegen_results.crate_info.profiler_runtime == Some(cnum) => { - add_static_crate(cmd, sess, archive_builder_builder, codegen_results, tmpdir, cnum); + add_static_crate( + cmd, + sess, + archive_builder_builder, + codegen_results, + tmpdir, + cnum, + &Default::default(), + ); } // compiler-builtins are always placed last to ensure that they're // linked correctly. @@ -2394,17 +2412,41 @@ fn add_upstream_rust_crates<'a>( } Linkage::NotLinked | Linkage::IncludedFromDylib => {} Linkage::Static => { - add_static_crate(cmd, sess, archive_builder_builder, codegen_results, tmpdir, cnum); + let bundled_libs = if sess.opts.unstable_opts.packed_bundled_libs { + codegen_results.crate_info.native_libraries[&cnum] + .iter() + .filter_map(|lib| lib.filename) + .collect::<FxHashSet<_>>() + } else { + Default::default() + }; + add_static_crate( + cmd, + sess, + archive_builder_builder, + codegen_results, + tmpdir, + cnum, + &bundled_libs, + ); // Link static native libs with "-bundle" modifier only if the crate they originate from // is being linked statically to the current crate. If it's linked dynamically // or is an rlib already included via some other dylib crate, the symbols from // native libs will have already been included in that dylib. // - // If -Zlink-native-libraries=false is set, then the assumption is that an + // If `-Zlink-native-libraries=false` is set, then the assumption is that an // external build system already has the native dependencies defined, and it // will provide them to the linker itself. if sess.opts.unstable_opts.link_native_libraries { + if sess.opts.unstable_opts.packed_bundled_libs { + // If rlib contains native libs as archives, unpack them to tmpdir. + let rlib = &src.rlib.as_ref().unwrap().0; + archive_builder_builder + .extract_bundled_libs(rlib, tmpdir, &bundled_libs) + .unwrap_or_else(|e| sess.fatal(e)); + } + let mut last = (None, NativeLibKind::Unspecified, None); for lib in &codegen_results.crate_info.native_libraries[&cnum] { let Some(name) = lib.name else { @@ -2437,6 +2479,14 @@ fn add_upstream_rust_crates<'a>( bundle: Some(false), whole_archive: Some(false) | None, } => { + // HACK/FIXME: Fixup a circular dependency between libgcc and libc + // with glibc. This logic should be moved to the libc crate. + if sess.target.os == "linux" + && sess.target.env == "gnu" + && name == "c" + { + cmd.link_staticlib("gcc", false); + } cmd.link_staticlib(name, lib.verbatim.unwrap_or(false)); } NativeLibKind::LinkArg => { @@ -2446,20 +2496,23 @@ fn add_upstream_rust_crates<'a>( | NativeLibKind::Framework { .. } | NativeLibKind::Unspecified | NativeLibKind::RawDylib => {} - NativeLibKind::Static { - bundle: Some(true) | None, - whole_archive: _, - } => {} + NativeLibKind::Static { bundle: Some(true) | None, whole_archive } => { + if sess.opts.unstable_opts.packed_bundled_libs { + // If rlib contains native libs as archives, they are unpacked to tmpdir. + let path = tmpdir.join(lib.filename.unwrap().as_str()); + if whole_archive == Some(true) { + cmd.link_whole_rlib(&path); + } else { + cmd.link_rlib(&path); + } + } + } } } } } Linkage::Dynamic => add_dynamic_crate(cmd, sess, &src.dylib.as_ref().unwrap().0), } - - if group_end == Some(cnum) { - cmd.group_end(); - } } // compiler-builtins are always placed last to ensure that they're @@ -2468,7 +2521,15 @@ fn add_upstream_rust_crates<'a>( // was already "included" in a dylib (e.g., `libstd` when `-C prefer-dynamic` // is used) if let Some(cnum) = compiler_builtins { - add_static_crate(cmd, sess, archive_builder_builder, codegen_results, tmpdir, cnum); + add_static_crate( + cmd, + sess, + archive_builder_builder, + codegen_results, + tmpdir, + cnum, + &Default::default(), + ); } // Converts a library file-stem into a cc -l argument @@ -2501,6 +2562,7 @@ fn add_upstream_rust_crates<'a>( codegen_results: &CodegenResults, tmpdir: &Path, cnum: CrateNum, + bundled_lib_file_names: &FxHashSet<Symbol>, ) { let src = &codegen_results.crate_info.used_crate_source[&cnum]; let cratepath = &src.rlib.as_ref().unwrap().0; @@ -2529,6 +2591,7 @@ fn add_upstream_rust_crates<'a>( let dst = tmpdir.join(cratepath.file_name().unwrap()); let name = cratepath.file_name().unwrap().to_str().unwrap(); let name = &name[3..name.len() - 5]; // chop off lib/.rlib + let bundled_lib_file_names = bundled_lib_file_names.clone(); sess.prof.generic_activity_with_arg("link_altering_rlib", name).run(|| { let canonical_name = name.replace('-', "_"); @@ -2562,6 +2625,15 @@ fn add_upstream_rust_crates<'a>( let skip_because_lto = upstream_rust_objects_already_included && is_rust_object && is_builtins; + // We skip native libraries because: + // 1. This native libraries won't be used from the generated rlib, + // so we can throw them away to avoid the copying work. + // 2. We can't allow it to be a single remaining entry in archive + // as some linkers may complain on that. + if bundled_lib_file_names.contains(&Symbol::intern(f)) { + return true; + } + if skip_because_cfg_say_so || skip_because_lto { return true; } @@ -2657,7 +2729,7 @@ fn relevant_lib(sess: &Session, lib: &NativeLib) -> bool { } } -fn are_upstream_rust_objects_already_included(sess: &Session) -> bool { +pub(crate) fn are_upstream_rust_objects_already_included(sess: &Session) -> bool { match sess.lto() { config::Lto::Fat => true, config::Lto::Thin => { @@ -2674,11 +2746,16 @@ fn add_apple_sdk(cmd: &mut dyn Linker, sess: &Session, flavor: LinkerFlavor) { let os = &sess.target.os; let llvm_target = &sess.target.llvm_target; if sess.target.vendor != "apple" - || !matches!(os.as_ref(), "ios" | "tvos" | "watchos") + || !matches!(os.as_ref(), "ios" | "tvos" | "watchos" | "macos") || (flavor != LinkerFlavor::Gcc && flavor != LinkerFlavor::Lld(LldFlavor::Ld64)) { return; } + + if os == "macos" && flavor != LinkerFlavor::Lld(LldFlavor::Ld64) { + return; + } + let sdk_name = match (arch.as_ref(), os.as_ref()) { ("aarch64", "tvos") => "appletvos", ("x86_64", "tvos") => "appletvsimulator", @@ -2694,6 +2771,7 @@ fn add_apple_sdk(cmd: &mut dyn Linker, sess: &Session, flavor: LinkerFlavor) { ("aarch64", "watchos") if llvm_target.ends_with("-simulator") => "watchsimulator", ("aarch64", "watchos") => "watchos", ("arm", "watchos") => "watchos", + (_, "macos") => "macosx", _ => { sess.err(&format!("unsupported arch `{}` for os `{}`", arch, os)); return; @@ -2777,20 +2855,24 @@ fn add_gcc_ld_path(cmd: &mut dyn Linker, sess: &Session, flavor: LinkerFlavor) { if let LinkerFlavor::Gcc = flavor { match ld_impl { LdImpl::Lld => { - let tools_path = sess.get_tools_search_paths(false); - let gcc_ld_dir = tools_path - .into_iter() - .map(|p| p.join("gcc-ld")) - .find(|p| { - p.join(if sess.host.is_like_windows { "ld.exe" } else { "ld" }).exists() - }) - .unwrap_or_else(|| sess.fatal("rust-lld (as ld) not found")); - cmd.arg({ - let mut arg = OsString::from("-B"); - arg.push(gcc_ld_dir); - arg - }); - cmd.arg(format!("-Wl,-rustc-lld-flavor={}", sess.target.lld_flavor.as_str())); + // Implement the "self-contained" part of -Zgcc-ld + // by adding rustc distribution directories to the tool search path. + for path in sess.get_tools_search_paths(false) { + cmd.arg({ + let mut arg = OsString::from("-B"); + arg.push(path.join("gcc-ld")); + arg + }); + } + // Implement the "linker flavor" part of -Zgcc-ld + // by asking cc to use some kind of lld. + cmd.arg("-fuse-ld=lld"); + if sess.target.lld_flavor != LldFlavor::Ld { + // Tell clang to use a non-default LLD flavor. + // Gcc doesn't understand the target option, but we currently assume + // that gcc is not used for Apple and Wasm targets (#97402). + cmd.arg(format!("--target={}", sess.target.llvm_target)); + } } } } else { diff --git a/compiler/rustc_codegen_ssa/src/back/linker.rs b/compiler/rustc_codegen_ssa/src/back/linker.rs index ce51b2e95..e505543b2 100644 --- a/compiler/rustc_codegen_ssa/src/back/linker.rs +++ b/compiler/rustc_codegen_ssa/src/back/linker.rs @@ -1,4 +1,3 @@ -use super::archive; use super::command::Command; use super::symbol_export; use rustc_span::symbol::sym; @@ -11,6 +10,7 @@ use std::path::{Path, PathBuf}; use std::{env, mem, str}; use rustc_hir::def_id::{CrateNum, LOCAL_CRATE}; +use rustc_metadata::find_native_static_library; use rustc_middle::middle::dependency_format::Linkage; use rustc_middle::middle::exported_symbols::{ExportedSymbol, SymbolExportInfo, SymbolExportKind}; use rustc_middle::ty::TyCtxt; @@ -126,29 +126,26 @@ pub fn get_linker<'a>( // to the linker args construction. assert!(cmd.get_args().is_empty() || sess.target.vendor == "uwp"); match flavor { - LinkerFlavor::Lld(LldFlavor::Link) | LinkerFlavor::Msvc => { - Box::new(MsvcLinker { cmd, sess }) as Box<dyn Linker> - } - LinkerFlavor::Em => Box::new(EmLinker { cmd, sess }) as Box<dyn Linker>, LinkerFlavor::Gcc => { Box::new(GccLinker { cmd, sess, target_cpu, hinted_static: false, is_ld: false }) as Box<dyn Linker> } - + LinkerFlavor::Ld if sess.target.os == "l4re" => { + Box::new(L4Bender::new(cmd, sess)) as Box<dyn Linker> + } LinkerFlavor::Lld(LldFlavor::Ld) | LinkerFlavor::Lld(LldFlavor::Ld64) | LinkerFlavor::Ld => { Box::new(GccLinker { cmd, sess, target_cpu, hinted_static: false, is_ld: true }) as Box<dyn Linker> } - + LinkerFlavor::Lld(LldFlavor::Link) | LinkerFlavor::Msvc => { + Box::new(MsvcLinker { cmd, sess }) as Box<dyn Linker> + } LinkerFlavor::Lld(LldFlavor::Wasm) => Box::new(WasmLd::new(cmd, sess)) as Box<dyn Linker>, - - LinkerFlavor::PtxLinker => Box::new(PtxLinker { cmd, sess }) as Box<dyn Linker>, - - LinkerFlavor::BpfLinker => Box::new(BpfLinker { cmd, sess }) as Box<dyn Linker>, - - LinkerFlavor::L4Bender => Box::new(L4Bender::new(cmd, sess)) as Box<dyn Linker>, + LinkerFlavor::EmCc => Box::new(EmLinker { cmd, sess }) as Box<dyn Linker>, + LinkerFlavor::Bpf => Box::new(BpfLinker { cmd, sess }) as Box<dyn Linker>, + LinkerFlavor::Ptx => Box::new(PtxLinker { cmd, sess }) as Box<dyn Linker>, } } @@ -186,8 +183,6 @@ pub trait Linker { fn no_default_libraries(&mut self); fn export_symbols(&mut self, tmpdir: &Path, crate_type: CrateType, symbols: &[String]); fn subsystem(&mut self, subsystem: &str); - fn group_start(&mut self); - fn group_end(&mut self); fn linker_plugin_lto(&mut self); fn add_eh_frame_header(&mut self) {} fn add_no_exec(&mut self) {} @@ -519,7 +514,7 @@ impl<'a> Linker for GccLinker<'a> { // -force_load is the macOS equivalent of --whole-archive, but it // involves passing the full path to the library to link. self.linker_arg("-force_load"); - let lib = archive::find_library(lib, verbatim, search_path, &self.sess); + let lib = find_native_static_library(lib, Some(verbatim), search_path, &self.sess); self.linker_arg(&lib); } } @@ -733,18 +728,6 @@ impl<'a> Linker for GccLinker<'a> { self.hint_dynamic(); // Reset to default before returning the composed command line. } - fn group_start(&mut self) { - if self.takes_hints() { - self.linker_arg("--start-group"); - } - } - - fn group_end(&mut self) { - if self.takes_hints() { - self.linker_arg("--end-group"); - } - } - fn linker_plugin_lto(&mut self) { match self.sess.opts.cg.linker_plugin_lto { LinkerPluginLto::Disabled => { @@ -1022,10 +1005,6 @@ impl<'a> Linker for MsvcLinker<'a> { } } - // MSVC doesn't need group indicators - fn group_start(&mut self) {} - fn group_end(&mut self) {} - fn linker_plugin_lto(&mut self) { // Do nothing } @@ -1168,10 +1147,6 @@ impl<'a> Linker for EmLinker<'a> { // noop } - // Appears not necessary on Emscripten - fn group_start(&mut self) {} - fn group_end(&mut self) {} - fn linker_plugin_lto(&mut self) { // Do nothing } @@ -1347,10 +1322,6 @@ impl<'a> Linker for WasmLd<'a> { fn subsystem(&mut self, _subsystem: &str) {} - // Not needed for now with LLD - fn group_start(&mut self) {} - fn group_end(&mut self) {} - fn linker_plugin_lto(&mut self) { // Do nothing for now } @@ -1479,14 +1450,6 @@ impl<'a> Linker for L4Bender<'a> { self.hint_static(); // Reset to default before returning the composed command line. } - fn group_start(&mut self) { - self.cmd.arg("--start-group"); - } - - fn group_end(&mut self) { - self.cmd.arg("--end-group"); - } - fn linker_plugin_lto(&mut self) {} fn control_flow_guard(&mut self) {} @@ -1667,10 +1630,6 @@ impl<'a> Linker for PtxLinker<'a> { fn subsystem(&mut self, _subsystem: &str) {} - fn group_start(&mut self) {} - - fn group_end(&mut self) {} - fn linker_plugin_lto(&mut self) {} } @@ -1780,9 +1739,5 @@ impl<'a> Linker for BpfLinker<'a> { fn subsystem(&mut self, _subsystem: &str) {} - fn group_start(&mut self) {} - - fn group_end(&mut self) {} - fn linker_plugin_lto(&mut self) {} } diff --git a/compiler/rustc_codegen_ssa/src/back/metadata.rs b/compiler/rustc_codegen_ssa/src/back/metadata.rs index 0302c2881..99ddd1764 100644 --- a/compiler/rustc_codegen_ssa/src/back/metadata.rs +++ b/compiler/rustc_codegen_ssa/src/back/metadata.rs @@ -117,6 +117,10 @@ pub(crate) fn create_object_file(sess: &Session) -> Option<write::Object<'static "riscv32" => Architecture::Riscv32, "riscv64" => Architecture::Riscv64, "sparc64" => Architecture::Sparc64, + "avr" => Architecture::Avr, + "msp430" => Architecture::Msp430, + "hexagon" => Architecture::Hexagon, + "bpf" => Architecture::Bpf, // Unsupported architecture. _ => return None, }; @@ -187,12 +191,12 @@ pub enum MetadataPosition { Last, } -// For rlibs we "pack" rustc metadata into a dummy object file. When rustc -// creates a dylib crate type it will pass `--whole-archive` (or the -// platform equivalent) to include all object files from an rlib into the -// final dylib itself. This causes linkers to iterate and try to include all -// files located in an archive, so if metadata is stored in an archive then -// it needs to be of a form that the linker will be able to process. +// For rlibs we "pack" rustc metadata into a dummy object file. +// +// Historically it was needed because rustc linked rlibs as whole-archive in some cases. +// In that case linkers try to include all files located in an archive, so if metadata is stored +// in an archive then it needs to be of a form that the linker is able to process. +// Now it's not clear whether metadata still needs to be wrapped into an object file or not. // // Note, though, that we don't actually want this metadata to show up in any // final output of the compiler. Instead this is purely for rustc's own diff --git a/compiler/rustc_codegen_ssa/src/back/symbol_export.rs b/compiler/rustc_codegen_ssa/src/back/symbol_export.rs index e6b605575..8d7e2c5cf 100644 --- a/compiler/rustc_codegen_ssa/src/back/symbol_export.rs +++ b/compiler/rustc_codegen_ssa/src/back/symbol_export.rs @@ -103,18 +103,14 @@ fn reachable_non_generics_provider(tcx: TyCtxt<'_>, cnum: CrateNum) -> DefIdMap< } }) .map(|def_id| { - let (export_level, used) = if special_runtime_crate { - let name = tcx.symbol_name(Instance::mono(tcx, def_id.to_def_id())).name; - // We won't link right if these symbols are stripped during LTO. - let used = match name { - "rust_eh_personality" - | "rust_eh_register_frames" - | "rust_eh_unregister_frames" => true, - _ => false, - }; - (SymbolExportLevel::Rust, used) + // We won't link right if this symbol is stripped during LTO. + let name = tcx.symbol_name(Instance::mono(tcx, def_id.to_def_id())).name; + let used = name == "rust_eh_personality"; + + let export_level = if special_runtime_crate { + SymbolExportLevel::Rust } else { - (symbol_export_level(tcx, def_id.to_def_id()), false) + symbol_export_level(tcx, def_id.to_def_id()) }; let codegen_attrs = tcx.codegen_fn_attrs(def_id.to_def_id()); debug!( @@ -544,7 +540,7 @@ pub fn linking_symbol_name_for_instance_in_crate<'tcx>( .map(|fnabi| (fnabi.conv, &fnabi.args[..])) .unwrap_or((Conv::Rust, &[])); - // Decorate symbols with prefices, suffices and total number of bytes of arguments. + // 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 => ("@", "@"), diff --git a/compiler/rustc_codegen_ssa/src/back/write.rs b/compiler/rustc_codegen_ssa/src/back/write.rs index 1b5ad8710..68f3b19b7 100644 --- a/compiler/rustc_codegen_ssa/src/back/write.rs +++ b/compiler/rustc_codegen_ssa/src/back/write.rs @@ -15,7 +15,7 @@ use rustc_data_structures::profiling::TimingGuard; use rustc_data_structures::profiling::VerboseTimingGuard; use rustc_data_structures::sync::Lrc; use rustc_errors::emitter::Emitter; -use rustc_errors::{DiagnosticId, FatalError, Handler, Level}; +use rustc_errors::{translation::Translate, DiagnosticId, FatalError, Handler, Level}; use rustc_fs_util::link_or_copy; use rustc_hir::def_id::{CrateNum, LOCAL_CRATE}; use rustc_incremental::{ @@ -256,8 +256,11 @@ impl ModuleConfig { { MergeFunctions::Disabled => false, MergeFunctions::Trampolines | MergeFunctions::Aliases => { - sess.opts.optimize == config::OptLevel::Default - || sess.opts.optimize == config::OptLevel::Aggressive + use config::OptLevel::*; + match sess.opts.optimize { + Aggressive | Default | SizeMin | Size => true, + Less | No => false, + } } }, @@ -1737,6 +1740,16 @@ impl SharedEmitter { } } +impl Translate for SharedEmitter { + fn fluent_bundle(&self) -> Option<&Lrc<rustc_errors::FluentBundle>> { + None + } + + fn fallback_fluent_bundle(&self) -> &rustc_errors::FluentBundle { + panic!("shared emitter attempted to translate a diagnostic"); + } +} + impl Emitter for SharedEmitter { fn emit_diagnostic(&mut self, diag: &rustc_errors::Diagnostic) { let fluent_args = self.to_fluent_args(diag.args()); @@ -1758,14 +1771,6 @@ impl Emitter for SharedEmitter { fn source_map(&self) -> Option<&Lrc<SourceMap>> { None } - - fn fluent_bundle(&self) -> Option<&Lrc<rustc_errors::FluentBundle>> { - None - } - - fn fallback_fluent_bundle(&self) -> &rustc_errors::FluentBundle { - panic!("shared emitter attempted to translate a diagnostic"); - } } impl SharedEmitterMain { @@ -1887,7 +1892,7 @@ impl<B: ExtraBackendMethods> OngoingCodegen<B> { } }); - sess.cgu_reuse_tracker.check_expected_reuse(sess.diagnostic()); + sess.cgu_reuse_tracker.check_expected_reuse(sess); sess.abort_if_errors(); diff --git a/compiler/rustc_codegen_ssa/src/base.rs b/compiler/rustc_codegen_ssa/src/base.rs index a840b2709..b98ff4957 100644 --- a/compiler/rustc_codegen_ssa/src/base.rs +++ b/compiler/rustc_codegen_ssa/src/base.rs @@ -1,3 +1,4 @@ +use crate::back::link::are_upstream_rust_objects_already_included; use crate::back::metadata::create_compressed_metadata_file; use crate::back::write::{ compute_per_cgu_lto_type, start_async_codegen, submit_codegened_module_to_llvm, @@ -12,7 +13,7 @@ use crate::traits::*; use crate::{CachedModuleCodegen, CompiledModule, CrateInfo, MemFlags, ModuleCodegen, ModuleKind}; use rustc_attr as attr; -use rustc_data_structures::fx::FxHashMap; +use rustc_data_structures::fx::{FxHashMap, FxHashSet}; use rustc_data_structures::profiling::{get_resident_set_size, print_time_passes_entry}; use rustc_data_structures::sync::par_iter; @@ -21,10 +22,12 @@ use rustc_data_structures::sync::ParallelIterator; use rustc_hir as hir; use rustc_hir::def_id::{DefId, LOCAL_CRATE}; use rustc_hir::lang_items::LangItem; +use rustc_hir::weak_lang_items::WEAK_ITEMS_SYMBOLS; use rustc_index::vec::Idx; use rustc_metadata::EncodedMetadata; use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrs; use rustc_middle::middle::exported_symbols; +use rustc_middle::middle::exported_symbols::SymbolExportKind; use rustc_middle::middle::lang_items; use rustc_middle::mir::mono::{CodegenUnit, CodegenUnitNameBuilder, MonoItem}; use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf, TyAndLayout}; @@ -34,6 +37,7 @@ use rustc_session::cgu_reuse_tracker::CguReuse; use rustc_session::config::{self, CrateType, EntryFnType, OutputType}; use rustc_session::Session; use rustc_span::symbol::sym; +use rustc_span::Symbol; use rustc_span::{DebuggerVisualizerFile, DebuggerVisualizerType}; use rustc_target::abi::{Align, VariantIdx}; @@ -151,6 +155,7 @@ pub fn unsized_info<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>( let old_info = old_info.expect("unsized_info: missing old info for trait upcasting coercion"); if data_a.principal_def_id() == data_b.principal_def_id() { + // A NOP cast that doesn't actually change anything, should be allowed even with invalid vtables. return old_info; } @@ -162,6 +167,11 @@ pub fn unsized_info<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>( if let Some(entry_idx) = vptr_entry_idx { let ptr_ty = cx.type_i8p(); let ptr_align = cx.tcx().data_layout.pointer_align.abi; + let vtable_ptr_ty = cx.scalar_pair_element_backend_type( + cx.layout_of(cx.tcx().mk_mut_ptr(target)), + 1, + true, + ); let llvtable = bx.pointercast(old_info, bx.type_ptr_to(ptr_ty)); let gep = bx.inbounds_gep( ptr_ty, @@ -172,7 +182,7 @@ pub fn unsized_info<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>( bx.nonnull_metadata(new_vptr); // VTable loads are invariant. bx.set_invariant_load(new_vptr); - new_vptr + bx.pointercast(new_vptr, vtable_ptr_ty) } else { old_info } @@ -388,15 +398,14 @@ pub fn maybe_create_entry_wrapper<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>( let main_llfn = cx.get_fn_addr(instance); - let use_start_lang_item = EntryFnType::Start != entry_type; - let entry_fn = create_entry_fn::<Bx>(cx, main_llfn, main_def_id, use_start_lang_item); + let entry_fn = create_entry_fn::<Bx>(cx, main_llfn, main_def_id, entry_type); return Some(entry_fn); fn create_entry_fn<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>( cx: &'a Bx::CodegenCx, rust_main: Bx::Value, rust_main_def_id: DefId, - use_start_lang_item: bool, + entry_type: EntryFnType, ) -> Bx::Function { // The entry function is either `int main(void)` or `int main(int argc, char **argv)`, // depending on whether the target needs `argc` and `argv` to be passed in. @@ -441,7 +450,7 @@ pub fn maybe_create_entry_wrapper<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>( let i8pp_ty = cx.type_ptr_to(cx.type_i8p()); let (arg_argc, arg_argv) = get_argc_argv(cx, &mut bx); - let (start_fn, start_ty, args) = if use_start_lang_item { + let (start_fn, start_ty, args) = if let EntryFnType::Main { sigpipe } = entry_type { let start_def_id = cx.tcx().require_lang_item(LangItem::Start, None); let start_fn = cx.get_fn_addr( ty::Instance::resolve( @@ -453,8 +462,13 @@ pub fn maybe_create_entry_wrapper<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>( .unwrap() .unwrap(), ); - let start_ty = cx.type_func(&[cx.val_ty(rust_main), isize_ty, i8pp_ty], isize_ty); - (start_fn, start_ty, vec![rust_main, arg_argc, arg_argv]) + + let i8_ty = cx.type_i8(); + let arg_sigpipe = bx.const_u8(sigpipe); + + let start_ty = + cx.type_func(&[cx.val_ty(rust_main), isize_ty, i8pp_ty, i8_ty], isize_ty); + (start_fn, start_ty, vec![rust_main, arg_argc, arg_argv, arg_sigpipe]) } else { debug!("using user-defined start fn"); let start_ty = cx.type_func(&[isize_ty, i8pp_ty], isize_ty); @@ -810,21 +824,16 @@ impl CrateInfo { crate_name: Default::default(), used_crates, used_crate_source: Default::default(), - lang_item_to_crate: Default::default(), - missing_lang_items: Default::default(), dependency_formats: tcx.dependency_formats(()).clone(), windows_subsystem, natvis_debugger_visualizers: Default::default(), }; - let lang_items = tcx.lang_items(); - let crates = tcx.crates(()); let n_crates = crates.len(); info.native_libraries.reserve(n_crates); info.crate_name.reserve(n_crates); info.used_crate_source.reserve(n_crates); - info.missing_lang_items.reserve(n_crates); for &cnum in crates.iter() { info.native_libraries @@ -842,17 +851,41 @@ impl CrateInfo { if tcx.is_no_builtins(cnum) { info.is_no_builtins.insert(cnum); } - let missing = tcx.missing_lang_items(cnum); - for &item in missing.iter() { - if let Ok(id) = lang_items.require(item) { - info.lang_item_to_crate.insert(item, id.krate); - } - } + } - // No need to look for lang items that don't actually need to exist. - let missing = - missing.iter().cloned().filter(|&l| lang_items::required(tcx, l)).collect(); - info.missing_lang_items.insert(cnum, missing); + // Handle circular dependencies in the standard library. + // See comment before `add_linked_symbol_object` function for the details. + // If global LTO is enabled then almost everything (*) is glued into a single object file, + // so this logic is not necessary and can cause issues on some targets (due to weak lang + // item symbols being "privatized" to that object file), so we disable it. + // (*) Native libs, and `#[compiler_builtins]` and `#[no_builtins]` crates are not glued, + // and we assume that they cannot define weak lang items. This is not currently enforced + // by the compiler, but that's ok because all this stuff is unstable anyway. + let target = &tcx.sess.target; + if !are_upstream_rust_objects_already_included(tcx.sess) { + let missing_weak_lang_items: FxHashSet<&Symbol> = info + .used_crates + .iter() + .flat_map(|cnum| { + tcx.missing_lang_items(*cnum) + .iter() + .filter(|l| lang_items::required(tcx, **l)) + .filter_map(|item| WEAK_ITEMS_SYMBOLS.get(item)) + }) + .collect(); + let prefix = if target.is_like_windows && target.arch == "x86" { "_" } else { "" }; + info.linked_symbols + .iter_mut() + .filter(|(crate_type, _)| { + !matches!(crate_type, CrateType::Rlib | CrateType::Staticlib) + }) + .for_each(|(_, linked_symbols)| { + linked_symbols.extend( + missing_weak_lang_items + .iter() + .map(|item| (format!("{prefix}{item}"), SymbolExportKind::Text)), + ) + }); } let embed_visualizers = tcx.sess.crate_types().iter().any(|&crate_type| match crate_type { @@ -873,7 +906,7 @@ impl CrateInfo { } }); - if tcx.sess.target.is_like_msvc && embed_visualizers { + if target.is_like_msvc && embed_visualizers { info.natvis_debugger_visualizers = collect_debugger_visualizers_transitive(tcx, DebuggerVisualizerType::Natvis); } diff --git a/compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs b/compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs index 8cd5a0fc2..135ed680d 100644 --- a/compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs +++ b/compiler/rustc_codegen_ssa/src/debuginfo/type_names.rs @@ -18,11 +18,10 @@ use rustc_hir::definitions::{DefPathData, DefPathDataName, DisambiguatedDefPathD use rustc_hir::{AsyncGeneratorKind, GeneratorKind, Mutability}; use rustc_middle::ty::layout::{IntegerExt, TyAndLayout}; use rustc_middle::ty::subst::{GenericArgKind, SubstsRef}; -use rustc_middle::ty::{self, ExistentialProjection, GeneratorSubsts, ParamEnv, Ty, TyCtxt}; -use rustc_target::abi::{Integer, TagEncoding, Variants}; +use rustc_middle::ty::{self, ExistentialProjection, ParamEnv, Ty, TyCtxt}; +use rustc_target::abi::Integer; use smallvec::SmallVec; -use std::borrow::Cow; use std::fmt::Write; use crate::debuginfo::wants_c_like_enum_debuginfo; @@ -98,7 +97,6 @@ fn push_debuginfo_type_name<'tcx>( if let Some(ty_and_layout) = layout_for_cpp_like_fallback { msvc_enum_fallback( - tcx, ty_and_layout, &|output, visited| { push_item_name(tcx, def.did(), true, output); @@ -391,11 +389,10 @@ fn push_debuginfo_type_name<'tcx>( // Name will be "{closure_env#0}<T1, T2, ...>", "{generator_env#0}<T1, T2, ...>", or // "{async_fn_env#0}<T1, T2, ...>", etc. // In the case of cpp-like debuginfo, the name additionally gets wrapped inside of - // an artificial `enum$<>` type, as defined in msvc_enum_fallback(). + // an artificial `enum2$<>` type, as defined in msvc_enum_fallback(). if cpp_like_debuginfo && t.is_generator() { let ty_and_layout = tcx.layout_of(ParamEnv::reveal_all().and(t)).unwrap(); msvc_enum_fallback( - tcx, ty_and_layout, &|output, visited| { push_closure_or_generator_name(tcx, def_id, substs, true, output, visited); @@ -428,58 +425,17 @@ fn push_debuginfo_type_name<'tcx>( /// MSVC names enums differently than other platforms so that the debugging visualization // format (natvis) is able to understand enums and render the active variant correctly in the - // debugger. For more information, look in `src/etc/natvis/intrinsic.natvis` and - // `EnumMemberDescriptionFactor::create_member_descriptions`. + // debugger. For more information, look in + // rustc_codegen_llvm/src/debuginfo/metadata/enums/cpp_like.rs. fn msvc_enum_fallback<'tcx>( - tcx: TyCtxt<'tcx>, ty_and_layout: TyAndLayout<'tcx>, push_inner: &dyn Fn(/*output*/ &mut String, /*visited*/ &mut FxHashSet<Ty<'tcx>>), output: &mut String, visited: &mut FxHashSet<Ty<'tcx>>, ) { debug_assert!(!wants_c_like_enum_debuginfo(ty_and_layout)); - let ty = ty_and_layout.ty; - - output.push_str("enum$<"); + output.push_str("enum2$<"); push_inner(output, visited); - - let variant_name = |variant_index| match ty.kind() { - ty::Adt(adt_def, _) => { - debug_assert!(adt_def.is_enum()); - Cow::from(adt_def.variant(variant_index).name.as_str()) - } - ty::Generator(..) => GeneratorSubsts::variant_name(variant_index), - _ => unreachable!(), - }; - - if let Variants::Multiple { - tag_encoding: TagEncoding::Niche { dataful_variant, .. }, - tag, - variants, - .. - } = &ty_and_layout.variants - { - let dataful_variant_layout = &variants[*dataful_variant]; - - // calculate the range of values for the dataful variant - let dataful_discriminant_range = - dataful_variant_layout.largest_niche().unwrap().valid_range; - - let min = dataful_discriminant_range.start; - let min = tag.size(&tcx).truncate(min); - - let max = dataful_discriminant_range.end; - let max = tag.size(&tcx).truncate(max); - - let dataful_variant_name = variant_name(*dataful_variant); - write!(output, ", {}, {}, {}", min, max, dataful_variant_name).unwrap(); - } else if let Variants::Single { index: variant_idx } = &ty_and_layout.variants { - // Uninhabited enums can't be constructed and should never need to be visualized so - // skip this step for them. - if !ty_and_layout.abi.is_uninhabited() { - write!(output, ", {}", variant_name(*variant_idx)).unwrap(); - } - } push_close_angle_bracket(true, output); } diff --git a/compiler/rustc_codegen_ssa/src/lib.rs b/compiler/rustc_codegen_ssa/src/lib.rs index 1802eedf1..e736b2aba 100644 --- a/compiler/rustc_codegen_ssa/src/lib.rs +++ b/compiler/rustc_codegen_ssa/src/lib.rs @@ -1,7 +1,7 @@ #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")] #![feature(box_patterns)] #![feature(try_blocks)] -#![feature(let_else)] +#![cfg_attr(bootstrap, feature(let_else))] #![feature(once_cell)] #![feature(associated_type_bounds)] #![feature(strict_provenance)] @@ -25,7 +25,6 @@ use rustc_ast as ast; use rustc_data_structures::fx::{FxHashMap, FxHashSet}; use rustc_data_structures::sync::Lrc; use rustc_hir::def_id::CrateNum; -use rustc_hir::LangItem; use rustc_middle::dep_graph::WorkProduct; use rustc_middle::middle::dependency_format::Dependencies; use rustc_middle::middle::exported_symbols::SymbolExportKind; @@ -113,6 +112,7 @@ bitflags::bitflags! { pub struct NativeLib { pub kind: NativeLibKind, pub name: Option<Symbol>, + pub filename: Option<Symbol>, pub cfg: Option<ast::MetaItem>, pub verbatim: Option<bool>, pub dll_imports: Vec<cstore::DllImport>, @@ -122,6 +122,7 @@ impl From<&cstore::NativeLib> for NativeLib { fn from(lib: &cstore::NativeLib) -> Self { NativeLib { kind: lib.kind, + filename: lib.filename, name: lib.name, cfg: lib.cfg.clone(), verbatim: lib.verbatim, @@ -152,8 +153,6 @@ pub struct CrateInfo { pub used_libraries: Vec<NativeLib>, pub used_crate_source: FxHashMap<CrateNum, Lrc<CrateSource>>, pub used_crates: Vec<CrateNum>, - pub lang_item_to_crate: FxHashMap<LangItem, CrateNum>, - pub missing_lang_items: FxHashMap<CrateNum, Vec<LangItem>>, pub dependency_formats: Lrc<Dependencies>, pub windows_subsystem: Option<String>, pub natvis_debugger_visualizers: BTreeSet<DebuggerVisualizerFile>, @@ -168,6 +167,13 @@ pub struct CodegenResults { pub crate_info: CrateInfo, } +pub enum CodegenErrors<'a> { + WrongFileType, + EmptyVersionNumber, + EncodingVersionMismatch { version_array: String, rlink_version: u32 }, + RustcVersionMismatch { rustc_version: String, current_version: &'a str }, +} + pub fn provide(providers: &mut Providers) { crate::back::symbol_export::provide(providers); crate::base::provide(providers); @@ -212,30 +218,34 @@ impl CodegenResults { encoder.finish() } - pub fn deserialize_rlink(data: Vec<u8>) -> Result<Self, String> { + pub fn deserialize_rlink<'a>(data: Vec<u8>) -> Result<Self, CodegenErrors<'a>> { // The Decodable machinery is not used here because it panics if the input data is invalid // and because its internal representation may change. if !data.starts_with(RLINK_MAGIC) { - return Err("The input does not look like a .rlink file".to_string()); + return Err(CodegenErrors::WrongFileType); } let data = &data[RLINK_MAGIC.len()..]; if data.len() < 4 { - return Err("The input does not contain version number".to_string()); + return Err(CodegenErrors::EmptyVersionNumber); } let mut version_array: [u8; 4] = Default::default(); version_array.copy_from_slice(&data[..4]); if u32::from_be_bytes(version_array) != RLINK_VERSION { - return Err(".rlink file was produced with encoding version {version_array}, but the current version is {RLINK_VERSION}".to_string()); + return Err(CodegenErrors::EncodingVersionMismatch { + version_array: String::from_utf8_lossy(&version_array).to_string(), + rlink_version: RLINK_VERSION, + }); } let mut decoder = MemDecoder::new(&data[4..], 0); let rustc_version = decoder.read_str(); let current_version = RUSTC_VERSION.unwrap(); if rustc_version != current_version { - return Err(format!( - ".rlink file was produced by rustc version {rustc_version}, but the current version is {current_version}." - )); + return Err(CodegenErrors::RustcVersionMismatch { + rustc_version: rustc_version.to_string(), + current_version, + }); } let codegen_results = CodegenResults::decode(&mut decoder); diff --git a/compiler/rustc_codegen_ssa/src/meth.rs b/compiler/rustc_codegen_ssa/src/meth.rs index 27d791d90..cae46ebd2 100644 --- a/compiler/rustc_codegen_ssa/src/meth.rs +++ b/compiler/rustc_codegen_ssa/src/meth.rs @@ -1,6 +1,6 @@ use crate::traits::*; -use rustc_middle::ty::{self, subst::GenericArgKind, ExistentialPredicate, Ty, TyCtxt}; +use rustc_middle::ty::{self, subst::GenericArgKind, Ty}; use rustc_session::config::Lto; use rustc_symbol_mangling::typeid_for_trait_ref; use rustc_target::abi::call::FnAbi; @@ -29,7 +29,7 @@ impl<'a, 'tcx> VirtualIndex { && bx.cx().sess().lto() == Lto::Fat { let typeid = - bx.typeid_metadata(typeid_for_trait_ref(bx.tcx(), get_trait_ref(bx.tcx(), ty))); + bx.typeid_metadata(typeid_for_trait_ref(bx.tcx(), expect_dyn_trait_in_self(ty))); let vtable_byte_offset = self.0 * bx.data_layout().pointer_size.bytes(); let type_checked_load = bx.type_checked_load(llvtable, vtable_byte_offset, typeid); let func = bx.extract_value(type_checked_load, 0); @@ -64,17 +64,13 @@ impl<'a, 'tcx> VirtualIndex { } } -fn get_trait_ref<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> ty::PolyExistentialTraitRef<'tcx> { +/// This takes a valid `self` receiver type and extracts the principal trait +/// ref of the type. +fn expect_dyn_trait_in_self<'tcx>(ty: Ty<'tcx>) -> ty::PolyExistentialTraitRef<'tcx> { for arg in ty.peel_refs().walk() { if let GenericArgKind::Type(ty) = arg.unpack() { - if let ty::Dynamic(trait_refs, _) = ty.kind() { - return trait_refs[0].map_bound(|trait_ref| match trait_ref { - ExistentialPredicate::Trait(tr) => tr, - ExistentialPredicate::Projection(proj) => proj.trait_ref(tcx), - ExistentialPredicate::AutoTrait(_) => { - bug!("auto traits don't have functions") - } - }); + if let ty::Dynamic(data, _, _) = ty.kind() { + return data.principal().expect("expected principal trait object"); } } } @@ -90,6 +86,7 @@ fn get_trait_ref<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> ty::PolyExistentialTr /// The `trait_ref` encodes the erased self type. Hence if we are /// making an object `Foo<dyn Trait>` from a value of type `Foo<T>`, then /// `trait_ref` would map `T: Trait`. +#[instrument(level = "debug", skip(cx))] pub fn get_vtable<'tcx, Cx: CodegenMethods<'tcx>>( cx: &Cx, ty: Ty<'tcx>, @@ -97,8 +94,6 @@ pub fn get_vtable<'tcx, Cx: CodegenMethods<'tcx>>( ) -> Cx::Value { let tcx = cx.tcx(); - debug!("get_vtable(ty={:?}, trait_ref={:?})", ty, trait_ref); - // Check the cache. if let Some(&val) = cx.vtables().borrow().get(&(ty, trait_ref)) { return val; diff --git a/compiler/rustc_codegen_ssa/src/mir/analyze.rs b/compiler/rustc_codegen_ssa/src/mir/analyze.rs index 24da48ead..c7617d2e4 100644 --- a/compiler/rustc_codegen_ssa/src/mir/analyze.rs +++ b/compiler/rustc_codegen_ssa/src/mir/analyze.rs @@ -266,7 +266,7 @@ pub fn cleanup_kinds(mir: &mir::Body<'_>) -> IndexVec<mir::BasicBlock, CleanupKi result: &mut IndexVec<mir::BasicBlock, CleanupKind>, mir: &mir::Body<'tcx>, ) { - for (bb, data) in mir.basic_blocks().iter_enumerated() { + for (bb, data) in mir.basic_blocks.iter_enumerated() { match data.terminator().kind { TerminatorKind::Goto { .. } | TerminatorKind::Resume @@ -296,7 +296,7 @@ pub fn cleanup_kinds(mir: &mir::Body<'_>) -> IndexVec<mir::BasicBlock, CleanupKi } fn propagate<'tcx>(result: &mut IndexVec<mir::BasicBlock, CleanupKind>, mir: &mir::Body<'tcx>) { - let mut funclet_succs = IndexVec::from_elem(None, mir.basic_blocks()); + let mut funclet_succs = IndexVec::from_elem(None, &mir.basic_blocks); let mut set_successor = |funclet: mir::BasicBlock, succ| match funclet_succs[funclet] { ref mut s @ None => { @@ -359,7 +359,7 @@ pub fn cleanup_kinds(mir: &mir::Body<'_>) -> IndexVec<mir::BasicBlock, CleanupKi } } - let mut result = IndexVec::from_elem(CleanupKind::NotCleanup, mir.basic_blocks()); + let mut result = IndexVec::from_elem(CleanupKind::NotCleanup, &mir.basic_blocks); discover_masters(&mut result, mir); propagate(&mut result, mir); diff --git a/compiler/rustc_codegen_ssa/src/mir/block.rs b/compiler/rustc_codegen_ssa/src/mir/block.rs index 3eee58d9d..a6b226ef7 100644 --- a/compiler/rustc_codegen_ssa/src/mir/block.rs +++ b/compiler/rustc_codegen_ssa/src/mir/block.rs @@ -13,15 +13,14 @@ use rustc_ast as ast; use rustc_ast::{InlineAsmOptions, InlineAsmTemplatePiece}; use rustc_hir::lang_items::LangItem; use rustc_index::vec::Idx; -use rustc_middle::mir::AssertKind; -use rustc_middle::mir::{self, SwitchTargets}; +use rustc_middle::mir::{self, AssertKind, SwitchTargets}; use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf}; use rustc_middle::ty::print::{with_no_trimmed_paths, with_no_visible_paths}; use rustc_middle::ty::{self, Instance, Ty, TypeVisitable}; use rustc_span::source_map::Span; use rustc_span::{sym, Symbol}; use rustc_symbol_mangling::typeid::typeid_for_fnabi; -use rustc_target::abi::call::{ArgAbi, FnAbi, PassMode}; +use rustc_target::abi::call::{ArgAbi, FnAbi, PassMode, Reg}; use rustc_target::abi::{self, HasDataLayout, WrappingRange}; use rustc_target::spec::abi::Abi; @@ -324,7 +323,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { bx.unreachable(); return; } - let llval = match self.fn_abi.ret.mode { + let llval = match &self.fn_abi.ret.mode { PassMode::Ignore | PassMode::Indirect { .. } => { bx.ret_void(); return; @@ -339,7 +338,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { } } - PassMode::Cast(cast_ty) => { + PassMode::Cast(cast_ty, _) => { let op = match self.locals[mir::RETURN_PLACE] { LocalRef::Operand(Some(op)) => op, LocalRef::Operand(None) => bug!("use of return before def"), @@ -360,7 +359,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { llval } }; - let ty = bx.cast_backend_type(&cast_ty); + let ty = bx.cast_backend_type(cast_ty); let addr = bx.pointercast(llslot, bx.type_ptr_to(ty)); bx.load(ty, addr, self.fn_abi.ret.layout.align.abi) } @@ -368,6 +367,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { bx.ret(llval); } + #[tracing::instrument(level = "trace", skip(self, helper, bx))] fn codegen_drop_terminator( &mut self, helper: TerminatorCodegenHelper<'tcx>, @@ -398,13 +398,29 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { let (drop_fn, fn_abi) = match ty.kind() { // FIXME(eddyb) perhaps move some of this logic into // `Instance::resolve_drop_in_place`? - ty::Dynamic(..) => { + ty::Dynamic(_, _, ty::Dyn) => { + // IN THIS ARM, WE HAVE: + // ty = *mut (dyn Trait) + // which is: exists<T> ( *mut T, Vtable<T: Trait> ) + // args[0] args[1] + // + // args = ( Data, Vtable ) + // | + // v + // /-------\ + // | ... | + // \-------/ + // let virtual_drop = Instance { def: ty::InstanceDef::Virtual(drop_fn.def_id(), 0), substs: drop_fn.substs, }; + debug!("ty = {:?}", ty); + debug!("drop_fn = {:?}", drop_fn); + debug!("args = {:?}", args); let fn_abi = bx.fn_abi_of_instance(virtual_drop, ty::List::empty()); let vtable = args[1]; + // Truncate vtable off of args list args = &args[..1]; ( meth::VirtualIndex::from_index(ty::COMMON_VTABLE_ENTRIES_DROPINPLACE) @@ -412,6 +428,51 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { fn_abi, ) } + ty::Dynamic(_, _, ty::DynStar) => { + // IN THIS ARM, WE HAVE: + // ty = *mut (dyn* Trait) + // which is: *mut exists<T: sizeof(T) == sizeof(usize)> (T, Vtable<T: Trait>) + // + // args = [ * ] + // | + // v + // ( Data, Vtable ) + // | + // v + // /-------\ + // | ... | + // \-------/ + // + // + // WE CAN CONVERT THIS INTO THE ABOVE LOGIC BY DOING + // + // data = &(*args[0]).0 // gives a pointer to Data above (really the same pointer) + // vtable = (*args[0]).1 // loads the vtable out + // (data, vtable) // an equivalent Rust `*mut dyn Trait` + // + // SO THEN WE CAN USE THE ABOVE CODE. + let virtual_drop = Instance { + def: ty::InstanceDef::Virtual(drop_fn.def_id(), 0), + substs: drop_fn.substs, + }; + debug!("ty = {:?}", ty); + debug!("drop_fn = {:?}", drop_fn); + debug!("args = {:?}", args); + let fn_abi = bx.fn_abi_of_instance(virtual_drop, ty::List::empty()); + let data = args[0]; + let data_ty = bx.cx().backend_type(place.layout); + let vtable_ptr = + bx.gep(data_ty, data, &[bx.cx().const_i32(0), bx.cx().const_i32(1)]); + let vtable = bx.load(bx.type_i8p(), vtable_ptr, abi::Align::ONE); + // Truncate vtable off of args list + args = &args[..1]; + debug!("args' = {:?}", args); + ( + meth::VirtualIndex::from_index(ty::COMMON_VTABLE_ENTRIES_DROPINPLACE) + .get_fn(&mut bx, vtable, ty, &fn_abi), + fn_abi, + ) + } _ => (bx.get_fn_addr(drop_fn), bx.fn_abi_of_instance(drop_fn, ty::List::empty())), }; helper.do_call( @@ -798,58 +859,78 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { let mut op = self.codegen_operand(&mut bx, arg); if let (0, Some(ty::InstanceDef::Virtual(_, idx))) = (i, def) { - if let Pair(..) = op.val { - // In the case of Rc<Self>, we need to explicitly pass a - // *mut RcBox<Self> with a Scalar (not ScalarPair) ABI. This is a hack - // that is understood elsewhere in the compiler as a method on - // `dyn Trait`. - // To get a `*mut RcBox<Self>`, we just keep unwrapping newtypes until - // we get a value of a built-in pointer type - 'descend_newtypes: while !op.layout.ty.is_unsafe_ptr() - && !op.layout.ty.is_region_ptr() - { - for i in 0..op.layout.fields.count() { - let field = op.extract_field(&mut bx, i); - if !field.layout.is_zst() { - // we found the one non-zero-sized field that is allowed - // now find *its* non-zero-sized field, or stop if it's a - // pointer - op = field; - continue 'descend_newtypes; + match op.val { + Pair(data_ptr, meta) => { + // In the case of Rc<Self>, we need to explicitly pass a + // *mut RcBox<Self> with a Scalar (not ScalarPair) ABI. This is a hack + // that is understood elsewhere in the compiler as a method on + // `dyn Trait`. + // To get a `*mut RcBox<Self>`, we just keep unwrapping newtypes until + // we get a value of a built-in pointer type + 'descend_newtypes: while !op.layout.ty.is_unsafe_ptr() + && !op.layout.ty.is_region_ptr() + { + for i in 0..op.layout.fields.count() { + let field = op.extract_field(&mut bx, i); + if !field.layout.is_zst() { + // we found the one non-zero-sized field that is allowed + // now find *its* non-zero-sized field, or stop if it's a + // pointer + op = field; + continue 'descend_newtypes; + } } + + span_bug!(span, "receiver has no non-zero-sized fields {:?}", op); } - span_bug!(span, "receiver has no non-zero-sized fields {:?}", op); + // now that we have `*dyn Trait` or `&dyn Trait`, split it up into its + // data pointer and vtable. Look up the method in the vtable, and pass + // the data pointer as the first argument + llfn = Some(meth::VirtualIndex::from_index(idx).get_fn( + &mut bx, + meta, + op.layout.ty, + &fn_abi, + )); + llargs.push(data_ptr); + continue 'make_args; } - - // now that we have `*dyn Trait` or `&dyn Trait`, split it up into its - // data pointer and vtable. Look up the method in the vtable, and pass - // the data pointer as the first argument - match op.val { - Pair(data_ptr, meta) => { - llfn = Some(meth::VirtualIndex::from_index(idx).get_fn( - &mut bx, - meta, - op.layout.ty, - &fn_abi, - )); - llargs.push(data_ptr); - continue 'make_args; + Ref(data_ptr, Some(meta), _) => { + // by-value dynamic dispatch + llfn = Some(meth::VirtualIndex::from_index(idx).get_fn( + &mut bx, + meta, + op.layout.ty, + &fn_abi, + )); + llargs.push(data_ptr); + continue; + } + Immediate(_) => { + let ty::Ref(_, ty, _) = op.layout.ty.kind() else { + span_bug!(span, "can't codegen a virtual call on {:#?}", op); + }; + if !ty.is_dyn_star() { + span_bug!(span, "can't codegen a virtual call on {:#?}", op); } - other => bug!("expected a Pair, got {:?}", other), + // FIXME(dyn-star): Make sure this is done on a &dyn* receiver + let place = op.deref(bx.cx()); + let data_ptr = place.project_field(&mut bx, 0); + let meta_ptr = place.project_field(&mut bx, 1); + let meta = bx.load_operand(meta_ptr); + llfn = Some(meth::VirtualIndex::from_index(idx).get_fn( + &mut bx, + meta.immediate(), + op.layout.ty, + &fn_abi, + )); + llargs.push(data_ptr.llval); + continue; + } + _ => { + span_bug!(span, "can't codegen a virtual call on {:#?}", op); } - } else if let Ref(data_ptr, Some(meta), _) = op.val { - // by-value dynamic dispatch - llfn = Some(meth::VirtualIndex::from_index(idx).get_fn( - &mut bx, - meta, - op.layout.ty, - &fn_abi, - )); - llargs.push(data_ptr); - continue; - } else { - span_bug!(span, "can't codegen a virtual call on {:?}", op); } } @@ -1161,39 +1242,35 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { llargs: &mut Vec<Bx::Value>, arg: &ArgAbi<'tcx, Ty<'tcx>>, ) { - // Fill padding with undef value, where applicable. - if let Some(ty) = arg.pad { - llargs.push(bx.const_undef(bx.reg_backend_type(&ty))) - } - - if arg.is_ignore() { - return; - } - - if let PassMode::Pair(..) = arg.mode { - match op.val { + match arg.mode { + PassMode::Ignore => return, + PassMode::Cast(_, true) => { + // Fill padding with undef value, where applicable. + llargs.push(bx.const_undef(bx.reg_backend_type(&Reg::i32()))); + } + PassMode::Pair(..) => match op.val { Pair(a, b) => { llargs.push(a); llargs.push(b); return; } _ => bug!("codegen_argument: {:?} invalid for pair argument", op), - } - } else if arg.is_unsized_indirect() { - match op.val { + }, + PassMode::Indirect { attrs: _, extra_attrs: Some(_), on_stack: _ } => match op.val { Ref(a, Some(b), _) => { llargs.push(a); llargs.push(b); return; } _ => bug!("codegen_argument: {:?} invalid for unsized indirect argument", op), - } + }, + _ => {} } // Force by-ref if we have to load through a cast pointer. let (mut llval, align, by_ref) = match op.val { Immediate(_) | Pair(..) => match arg.mode { - PassMode::Indirect { .. } | PassMode::Cast(_) => { + PassMode::Indirect { .. } | PassMode::Cast(..) => { let scratch = PlaceRef::alloca(bx, arg.layout); op.val.store(bx, scratch); (scratch.llval, scratch.align, true) @@ -1225,8 +1302,8 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { if by_ref && !arg.is_indirect() { // Have to load the argument, maybe while casting it. - if let PassMode::Cast(ty) = arg.mode { - let llty = bx.cast_backend_type(&ty); + if let PassMode::Cast(ty, _) = &arg.mode { + let llty = bx.cast_backend_type(ty); let addr = bx.pointercast(llval, bx.type_ptr_to(llty)); llval = bx.load(llty, addr, align.min(arg.layout.align.abi)); } else { @@ -1625,7 +1702,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { } DirectOperand(index) => { // If there is a cast, we have to store and reload. - let op = if let PassMode::Cast(_) = ret_abi.mode { + let op = if let PassMode::Cast(..) = ret_abi.mode { let tmp = PlaceRef::alloca(bx, ret_abi.layout); tmp.storage_live(bx); bx.store_arg(&ret_abi, llval, tmp); diff --git a/compiler/rustc_codegen_ssa/src/mir/constant.rs b/compiler/rustc_codegen_ssa/src/mir/constant.rs index 9a995fbf6..4c6ab457c 100644 --- a/compiler/rustc_codegen_ssa/src/mir/constant.rs +++ b/compiler/rustc_codegen_ssa/src/mir/constant.rs @@ -25,26 +25,26 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { constant: &mir::Constant<'tcx>, ) -> Result<ConstValue<'tcx>, ErrorHandled> { let ct = self.monomorphize(constant.literal); - let ct = match ct { - mir::ConstantKind::Ty(ct) => ct, + let uv = match ct { + mir::ConstantKind::Ty(ct) => match ct.kind() { + ty::ConstKind::Unevaluated(uv) => uv.expand(), + ty::ConstKind::Value(val) => { + return Ok(self.cx.tcx().valtree_to_const_val((ct.ty(), val))); + } + err => span_bug!( + constant.span, + "encountered bad ConstKind after monomorphizing: {:?}", + err + ), + }, + mir::ConstantKind::Unevaluated(uv, _) => uv, mir::ConstantKind::Val(val, _) => return Ok(val), }; - match ct.kind() { - ty::ConstKind::Unevaluated(ct) => self - .cx - .tcx() - .const_eval_resolve(ty::ParamEnv::reveal_all(), ct, None) - .map_err(|err| { - self.cx.tcx().sess.span_err(constant.span, "erroneous constant encountered"); - err - }), - ty::ConstKind::Value(val) => Ok(self.cx.tcx().valtree_to_const_val((ct.ty(), val))), - err => span_bug!( - constant.span, - "encountered bad ConstKind after monomorphizing: {:?}", - err - ), - } + + self.cx.tcx().const_eval_resolve(ty::ParamEnv::reveal_all(), uv, None).map_err(|err| { + self.cx.tcx().sess.span_err(constant.span, "erroneous constant encountered"); + err + }) } /// process constant containing SIMD shuffle indices diff --git a/compiler/rustc_codegen_ssa/src/mir/debuginfo.rs b/compiler/rustc_codegen_ssa/src/mir/debuginfo.rs index 8c3186efc..157c1c823 100644 --- a/compiler/rustc_codegen_ssa/src/mir/debuginfo.rs +++ b/compiler/rustc_codegen_ssa/src/mir/debuginfo.rs @@ -3,7 +3,7 @@ use rustc_index::vec::IndexVec; use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags; use rustc_middle::mir; use rustc_middle::ty; -use rustc_middle::ty::layout::LayoutOf; +use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf}; use rustc_session::config::DebugInfo; use rustc_span::symbol::{kw, Symbol}; use rustc_span::{BytePos, Span}; @@ -93,15 +93,15 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { } /// In order to have a good line stepping behavior in debugger, we overwrite debug - /// locations of macro expansions with that of the outermost expansion site - /// (unless the crate is being compiled with `-Z debug-macros`). + /// locations of macro expansions with that of the outermost expansion site (when the macro is + /// annotated with `#[collapse_debuginfo]` or when `-Zdebug-macros` is provided). fn adjust_span_for_debugging(&self, mut span: Span) -> Span { // Bail out if debug info emission is not enabled. if self.debug_context.is_none() { return span; } - if span.from_expansion() && !self.cx.sess().opts.unstable_opts.debug_macros { + if self.cx.tcx().should_collapse_debuginfo(span) { // Walk up the macro expansion chain until we reach a non-expanded span. // We also stop at the function body level because no line stepping can occur // at the level above that. diff --git a/compiler/rustc_codegen_ssa/src/mir/intrinsic.rs b/compiler/rustc_codegen_ssa/src/mir/intrinsic.rs index 94ac71a4d..215edbe02 100644 --- a/compiler/rustc_codegen_ssa/src/mir/intrinsic.rs +++ b/compiler/rustc_codegen_ssa/src/mir/intrinsic.rs @@ -77,10 +77,6 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { let result = PlaceRef::new_sized(llresult, fn_abi.ret.layout); let llval = match name { - sym::assume => { - bx.assume(args[0].immediate()); - return; - } sym::abort => { bx.abort(); return; @@ -555,14 +551,10 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { return; } - sym::ptr_guaranteed_eq | sym::ptr_guaranteed_ne => { + sym::ptr_guaranteed_cmp => { let a = args[0].immediate(); let b = args[1].immediate(); - if name == sym::ptr_guaranteed_eq { - bx.icmp(IntPredicate::IntEQ, a, b) - } else { - bx.icmp(IntPredicate::IntNE, a, b) - } + bx.icmp(IntPredicate::IntEQ, a, b) } sym::ptr_offset_from | sym::ptr_offset_from_unsigned => { @@ -597,8 +589,8 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { }; if !fn_abi.ret.is_ignore() { - if let PassMode::Cast(ty) = fn_abi.ret.mode { - let ptr_llty = bx.type_ptr_to(bx.cast_backend_type(&ty)); + if let PassMode::Cast(ty, _) = &fn_abi.ret.mode { + let ptr_llty = bx.type_ptr_to(bx.cast_backend_type(ty)); let ptr = bx.pointercast(result.llval, ptr_llty); bx.store(llval, ptr, result.align); } else { diff --git a/compiler/rustc_codegen_ssa/src/mir/mod.rs b/compiler/rustc_codegen_ssa/src/mir/mod.rs index 8ee375fa9..2b931bfc9 100644 --- a/compiler/rustc_codegen_ssa/src/mir/mod.rs +++ b/compiler/rustc_codegen_ssa/src/mir/mod.rs @@ -150,13 +150,13 @@ pub fn codegen_mir<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>( let start_llbb = Bx::append_block(cx, llfn, "start"); let mut bx = Bx::build(cx, start_llbb); - if mir.basic_blocks().iter().any(|bb| bb.is_cleanup) { + if mir.basic_blocks.iter().any(|bb| bb.is_cleanup) { bx.set_personality_fn(cx.eh_personality()); } let cleanup_kinds = analyze::cleanup_kinds(&mir); let cached_llbbs: IndexVec<mir::BasicBlock, Option<Bx::BasicBlock>> = mir - .basic_blocks() + .basic_blocks .indices() .map(|bb| if bb == mir::START_BLOCK { Some(start_llbb) } else { None }) .collect(); @@ -172,8 +172,8 @@ pub fn codegen_mir<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>( unreachable_block: None, double_unwind_guard: None, cleanup_kinds, - landing_pads: IndexVec::from_elem(None, mir.basic_blocks()), - funclets: IndexVec::from_fn_n(|_| None, mir.basic_blocks().len()), + landing_pads: IndexVec::from_elem(None, &mir.basic_blocks), + funclets: IndexVec::from_fn_n(|_| None, mir.basic_blocks.len()), locals: IndexVec::new(), debug_context, per_local_var_debug_info: None, @@ -191,7 +191,7 @@ pub fn codegen_mir<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>( // errored or at least linted ErrorHandled::Reported(_) | ErrorHandled::Linted => {} ErrorHandled::TooGeneric => { - span_bug!(const_.span, "codgen encountered polymorphic constant: {:?}", err) + span_bug!(const_.span, "codegen encountered polymorphic constant: {:?}", err) } } } @@ -283,7 +283,7 @@ fn arg_local_refs<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>( for i in 0..tupled_arg_tys.len() { let arg = &fx.fn_abi.args[idx]; idx += 1; - if arg.pad.is_some() { + if let PassMode::Cast(_, true) = arg.mode { llarg_idx += 1; } let pr_field = place.project_field(bx, i); @@ -309,7 +309,7 @@ fn arg_local_refs<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>( let arg = &fx.fn_abi.args[idx]; idx += 1; - if arg.pad.is_some() { + if let PassMode::Cast(_, true) = arg.mode { llarg_idx += 1; } diff --git a/compiler/rustc_codegen_ssa/src/mir/operand.rs b/compiler/rustc_codegen_ssa/src/mir/operand.rs index c612634fc..37b1e0362 100644 --- a/compiler/rustc_codegen_ssa/src/mir/operand.rs +++ b/compiler/rustc_codegen_ssa/src/mir/operand.rs @@ -72,10 +72,6 @@ impl<'a, 'tcx, V: CodegenObject> OperandRef<'tcx, V> { ) -> Self { let layout = bx.layout_of(ty); - if layout.is_zst() { - return OperandRef::new_zst(bx, layout); - } - let val = match val { ConstValue::Scalar(x) => { let Abi::Scalar(scalar) = layout.abi else { @@ -84,10 +80,7 @@ impl<'a, 'tcx, V: CodegenObject> OperandRef<'tcx, V> { let llval = bx.scalar_to_backend(x, scalar, bx.immediate_backend_type(layout)); OperandValue::Immediate(llval) } - ConstValue::ZeroSized => { - let llval = bx.zst_to_backend(bx.immediate_backend_type(layout)); - OperandValue::Immediate(llval) - } + ConstValue::ZeroSized => return OperandRef::new_zst(bx, layout), ConstValue::Slice { data, start, end } => { let Abi::ScalarPair(a_scalar, _) = layout.abi else { bug!("from_const: invalid ScalarPair layout: {:#?}", layout); diff --git a/compiler/rustc_codegen_ssa/src/mir/place.rs b/compiler/rustc_codegen_ssa/src/mir/place.rs index 268c4d765..13d8f6edd 100644 --- a/compiler/rustc_codegen_ssa/src/mir/place.rs +++ b/compiler/rustc_codegen_ssa/src/mir/place.rs @@ -4,7 +4,6 @@ use super::{FunctionCx, LocalRef}; use crate::common::IntPredicate; use crate::glue; use crate::traits::*; -use crate::MemFlags; use rustc_middle::mir; use rustc_middle::mir::tcx::PlaceTy; @@ -245,7 +244,7 @@ impl<'a, 'tcx, V: CodegenObject> PlaceRef<'tcx, V> { }; bx.intcast(tag.immediate(), cast_to, signed) } - TagEncoding::Niche { dataful_variant, ref niche_variants, niche_start } => { + TagEncoding::Niche { untagged_variant, ref niche_variants, niche_start } => { // Rebase from niche values to discriminants, and check // whether the result is in range for the niche variants. let niche_llty = bx.cx().immediate_backend_type(tag.layout); @@ -303,7 +302,7 @@ impl<'a, 'tcx, V: CodegenObject> PlaceRef<'tcx, V> { bx.select( is_niche, niche_discr, - bx.cx().const_uint(cast_to, dataful_variant.as_u32() as u64), + bx.cx().const_uint(cast_to, untagged_variant.as_u32() as u64), ) } } @@ -338,21 +337,11 @@ impl<'a, 'tcx, V: CodegenObject> PlaceRef<'tcx, V> { } Variants::Multiple { tag_encoding: - TagEncoding::Niche { dataful_variant, ref niche_variants, niche_start }, + TagEncoding::Niche { untagged_variant, ref niche_variants, niche_start }, tag_field, .. } => { - if variant_index != dataful_variant { - if bx.cx().sess().target.arch == "arm" - || bx.cx().sess().target.arch == "aarch64" - { - // FIXME(#34427): as workaround for LLVM bug on ARM, - // use memset of 0 before assigning niche value. - let fill_byte = bx.cx().const_u8(0); - let size = bx.cx().const_usize(self.layout.size.bytes()); - bx.memset(self.llval, fill_byte, size, self.align, MemFlags::empty()); - } - + if variant_index != untagged_variant { let niche = self.project_field(bx, tag_field); let niche_llty = bx.cx().immediate_backend_type(niche.layout); let niche_value = variant_index.as_u32() - niche_variants.start().as_u32(); diff --git a/compiler/rustc_codegen_ssa/src/mir/rvalue.rs b/compiler/rustc_codegen_ssa/src/mir/rvalue.rs index 26b9fbf44..56852b0fc 100644 --- a/compiler/rustc_codegen_ssa/src/mir/rvalue.rs +++ b/compiler/rustc_codegen_ssa/src/mir/rvalue.rs @@ -4,6 +4,7 @@ use super::{FunctionCx, LocalRef}; use crate::base; use crate::common::{self, IntPredicate}; +use crate::meth::get_vtable; use crate::traits::*; use crate::MemFlags; @@ -87,7 +88,7 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { let size = bx.const_usize(dest.layout.size.bytes()); // Use llvm.memset.p0i8.* to initialize all zero arrays - if bx.cx().const_to_opt_uint(v) == Some(0) { + if bx.cx().const_to_opt_u128(v, false) == Some(0) { let fill = bx.cx().const_u8(0); bx.memset(start, fill, size, dest.align, MemFlags::empty()); return bx; @@ -271,6 +272,21 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { bug!("unexpected non-pair operand"); } } + mir::CastKind::DynStar => { + let data = match operand.val { + OperandValue::Ref(_, _, _) => todo!(), + OperandValue::Immediate(v) => v, + OperandValue::Pair(_, _) => todo!(), + }; + let trait_ref = + if let ty::Dynamic(data, _, ty::DynStar) = cast.ty.kind() { + data.principal() + } else { + bug!("Only valid to do a DynStar cast into a DynStar type") + }; + let vtable = get_vtable(bx.cx(), source.ty(self.mir, bx.tcx()), trait_ref); + OperandValue::Pair(data, vtable) + } mir::CastKind::Pointer( PointerCast::MutToConstPointer | PointerCast::ArrayToPointer, ) diff --git a/compiler/rustc_codegen_ssa/src/mir/statement.rs b/compiler/rustc_codegen_ssa/src/mir/statement.rs index f452f2988..1db0fb3a6 100644 --- a/compiler/rustc_codegen_ssa/src/mir/statement.rs +++ b/compiler/rustc_codegen_ssa/src/mir/statement.rs @@ -1,4 +1,5 @@ use rustc_middle::mir; +use rustc_middle::mir::NonDivergingIntrinsic; use super::FunctionCx; use super::LocalRef; @@ -73,11 +74,14 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> { self.codegen_coverage(&mut bx, coverage.clone(), statement.source_info.scope); bx } - mir::StatementKind::CopyNonOverlapping(box mir::CopyNonOverlapping { - ref src, - ref dst, - ref count, - }) => { + mir::StatementKind::Intrinsic(box NonDivergingIntrinsic::Assume(ref op)) => { + let op_val = self.codegen_operand(&mut bx, op); + bx.assume(op_val.immediate()); + bx + } + mir::StatementKind::Intrinsic(box NonDivergingIntrinsic::CopyNonOverlapping( + mir::CopyNonOverlapping { ref count, ref src, ref dst }, + )) => { let dst_val = self.codegen_operand(&mut bx, dst); let src_val = self.codegen_operand(&mut bx, src); let count = self.codegen_operand(&mut bx, count).immediate(); diff --git a/compiler/rustc_codegen_ssa/src/target_features.rs b/compiler/rustc_codegen_ssa/src/target_features.rs index ecad05185..0e259bcd1 100644 --- a/compiler/rustc_codegen_ssa/src/target_features.rs +++ b/compiler/rustc_codegen_ssa/src/target_features.rs @@ -210,8 +210,11 @@ const POWERPC_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[ ("vsx", Some(sym::powerpc_target_feature)), ]; -const MIPS_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = - &[("fp64", Some(sym::mips_target_feature)), ("msa", Some(sym::mips_target_feature))]; +const MIPS_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[ + ("fp64", Some(sym::mips_target_feature)), + ("msa", Some(sym::mips_target_feature)), + ("virt", Some(sym::mips_target_feature)), +]; const RISCV_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[ ("m", Some(sym::riscv_target_feature)), @@ -227,6 +230,10 @@ const RISCV_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[ ("zhinxmin", Some(sym::riscv_target_feature)), ("zfh", Some(sym::riscv_target_feature)), ("zfhmin", Some(sym::riscv_target_feature)), + ("zba", Some(sym::riscv_target_feature)), + ("zbb", Some(sym::riscv_target_feature)), + ("zbc", Some(sym::riscv_target_feature)), + ("zbs", Some(sym::riscv_target_feature)), ("zbkb", Some(sym::riscv_target_feature)), ("zbkc", Some(sym::riscv_target_feature)), ("zbkx", Some(sym::riscv_target_feature)), diff --git a/compiler/rustc_codegen_ssa/src/traits/builder.rs b/compiler/rustc_codegen_ssa/src/traits/builder.rs index 9f49749bb..10cf8948b 100644 --- a/compiler/rustc_codegen_ssa/src/traits/builder.rs +++ b/compiler/rustc_codegen_ssa/src/traits/builder.rs @@ -1,6 +1,5 @@ use super::abi::AbiBuilderMethods; use super::asm::AsmBuilderMethods; -use super::consts::ConstMethods; use super::coverageinfo::CoverageInfoBuilderMethods; use super::debuginfo::DebugInfoBuilderMethods; use super::intrinsic::IntrinsicCallMethods; @@ -15,7 +14,6 @@ use crate::mir::operand::OperandRef; use crate::mir::place::PlaceRef; use crate::MemFlags; -use rustc_apfloat::{ieee, Float, Round, Status}; use rustc_middle::ty::layout::{HasParamEnv, TyAndLayout}; use rustc_middle::ty::Ty; use rustc_span::Span; @@ -188,8 +186,8 @@ pub trait BuilderMethods<'a, 'tcx>: fn trunc(&mut self, val: Self::Value, dest_ty: Self::Type) -> Self::Value; fn sext(&mut self, val: Self::Value, dest_ty: Self::Type) -> Self::Value; - fn fptoui_sat(&mut self, val: Self::Value, dest_ty: Self::Type) -> Option<Self::Value>; - fn fptosi_sat(&mut self, val: Self::Value, dest_ty: Self::Type) -> Option<Self::Value>; + fn fptoui_sat(&mut self, val: Self::Value, dest_ty: Self::Type) -> Self::Value; + fn fptosi_sat(&mut self, val: Self::Value, dest_ty: Self::Type) -> Self::Value; fn fptoui(&mut self, val: Self::Value, dest_ty: Self::Type) -> Self::Value; fn fptosi(&mut self, val: Self::Value, dest_ty: Self::Type) -> Self::Value; fn uitofp(&mut self, val: Self::Value, dest_ty: Self::Type) -> Self::Value; @@ -223,156 +221,7 @@ pub trait BuilderMethods<'a, 'tcx>: return if signed { self.fptosi(x, dest_ty) } else { self.fptoui(x, dest_ty) }; } - let try_sat_result = - if signed { self.fptosi_sat(x, dest_ty) } else { self.fptoui_sat(x, dest_ty) }; - if let Some(try_sat_result) = try_sat_result { - return try_sat_result; - } - - let int_width = self.cx().int_width(int_ty); - let float_width = self.cx().float_width(float_ty); - // LLVM's fpto[su]i returns undef when the input x is infinite, NaN, or does not fit into the - // destination integer type after rounding towards zero. This `undef` value can cause UB in - // safe code (see issue #10184), so we implement a saturating conversion on top of it: - // Semantically, the mathematical value of the input is rounded towards zero to the next - // mathematical integer, and then the result is clamped into the range of the destination - // integer type. Positive and negative infinity are mapped to the maximum and minimum value of - // the destination integer type. NaN is mapped to 0. - // - // Define f_min and f_max as the largest and smallest (finite) floats that are exactly equal to - // a value representable in int_ty. - // They are exactly equal to int_ty::{MIN,MAX} if float_ty has enough significand bits. - // Otherwise, int_ty::MAX must be rounded towards zero, as it is one less than a power of two. - // int_ty::MIN, however, is either zero or a negative power of two and is thus exactly - // representable. Note that this only works if float_ty's exponent range is sufficiently large. - // f16 or 256 bit integers would break this property. Right now the smallest float type is f32 - // with exponents ranging up to 127, which is barely enough for i128::MIN = -2^127. - // On the other hand, f_max works even if int_ty::MAX is greater than float_ty::MAX. Because - // we're rounding towards zero, we just get float_ty::MAX (which is always an integer). - // This already happens today with u128::MAX = 2^128 - 1 > f32::MAX. - let int_max = |signed: bool, int_width: u64| -> u128 { - let shift_amount = 128 - int_width; - if signed { i128::MAX as u128 >> shift_amount } else { u128::MAX >> shift_amount } - }; - let int_min = |signed: bool, int_width: u64| -> i128 { - if signed { i128::MIN >> (128 - int_width) } else { 0 } - }; - - let compute_clamp_bounds_single = |signed: bool, int_width: u64| -> (u128, u128) { - let rounded_min = - ieee::Single::from_i128_r(int_min(signed, int_width), Round::TowardZero); - assert_eq!(rounded_min.status, Status::OK); - let rounded_max = - ieee::Single::from_u128_r(int_max(signed, int_width), Round::TowardZero); - assert!(rounded_max.value.is_finite()); - (rounded_min.value.to_bits(), rounded_max.value.to_bits()) - }; - let compute_clamp_bounds_double = |signed: bool, int_width: u64| -> (u128, u128) { - let rounded_min = - ieee::Double::from_i128_r(int_min(signed, int_width), Round::TowardZero); - assert_eq!(rounded_min.status, Status::OK); - let rounded_max = - ieee::Double::from_u128_r(int_max(signed, int_width), Round::TowardZero); - assert!(rounded_max.value.is_finite()); - (rounded_min.value.to_bits(), rounded_max.value.to_bits()) - }; - // To implement saturation, we perform the following steps: - // - // 1. Cast x to an integer with fpto[su]i. This may result in undef. - // 2. Compare x to f_min and f_max, and use the comparison results to select: - // a) int_ty::MIN if x < f_min or x is NaN - // b) int_ty::MAX if x > f_max - // c) the result of fpto[su]i otherwise - // 3. If x is NaN, return 0.0, otherwise return the result of step 2. - // - // This avoids resulting undef because values in range [f_min, f_max] by definition fit into the - // destination type. It creates an undef temporary, but *producing* undef is not UB. Our use of - // undef does not introduce any non-determinism either. - // More importantly, the above procedure correctly implements saturating conversion. - // Proof (sketch): - // If x is NaN, 0 is returned by definition. - // Otherwise, x is finite or infinite and thus can be compared with f_min and f_max. - // This yields three cases to consider: - // (1) if x in [f_min, f_max], the result of fpto[su]i is returned, which agrees with - // saturating conversion for inputs in that range. - // (2) if x > f_max, then x is larger than int_ty::MAX. This holds even if f_max is rounded - // (i.e., if f_max < int_ty::MAX) because in those cases, nextUp(f_max) is already larger - // than int_ty::MAX. Because x is larger than int_ty::MAX, the return value of int_ty::MAX - // is correct. - // (3) if x < f_min, then x is smaller than int_ty::MIN. As shown earlier, f_min exactly equals - // int_ty::MIN and therefore the return value of int_ty::MIN is correct. - // QED. - - let float_bits_to_llval = |bx: &mut Self, bits| { - let bits_llval = match float_width { - 32 => bx.cx().const_u32(bits as u32), - 64 => bx.cx().const_u64(bits as u64), - n => bug!("unsupported float width {}", n), - }; - bx.bitcast(bits_llval, float_ty) - }; - let (f_min, f_max) = match float_width { - 32 => compute_clamp_bounds_single(signed, int_width), - 64 => compute_clamp_bounds_double(signed, int_width), - n => bug!("unsupported float width {}", n), - }; - let f_min = float_bits_to_llval(self, f_min); - let f_max = float_bits_to_llval(self, f_max); - let int_max = self.cx().const_uint_big(int_ty, int_max(signed, int_width)); - let int_min = self.cx().const_uint_big(int_ty, int_min(signed, int_width) as u128); - let zero = self.cx().const_uint(int_ty, 0); - - // If we're working with vectors, constants must be "splatted": the constant is duplicated - // into each lane of the vector. The algorithm stays the same, we are just using the - // same constant across all lanes. - let maybe_splat = |bx: &mut Self, val| { - if bx.cx().type_kind(dest_ty) == TypeKind::Vector { - bx.vector_splat(bx.vector_length(dest_ty), val) - } else { - val - } - }; - let f_min = maybe_splat(self, f_min); - let f_max = maybe_splat(self, f_max); - let int_max = maybe_splat(self, int_max); - let int_min = maybe_splat(self, int_min); - let zero = maybe_splat(self, zero); - - // Step 1 ... - let fptosui_result = if signed { self.fptosi(x, dest_ty) } else { self.fptoui(x, dest_ty) }; - let less_or_nan = self.fcmp(RealPredicate::RealULT, x, f_min); - let greater = self.fcmp(RealPredicate::RealOGT, x, f_max); - - // Step 2: We use two comparisons and two selects, with %s1 being the - // result: - // %less_or_nan = fcmp ult %x, %f_min - // %greater = fcmp olt %x, %f_max - // %s0 = select %less_or_nan, int_ty::MIN, %fptosi_result - // %s1 = select %greater, int_ty::MAX, %s0 - // Note that %less_or_nan uses an *unordered* comparison. This - // comparison is true if the operands are not comparable (i.e., if x is - // NaN). The unordered comparison ensures that s1 becomes int_ty::MIN if - // x is NaN. - // - // Performance note: Unordered comparison can be lowered to a "flipped" - // comparison and a negation, and the negation can be merged into the - // select. Therefore, it not necessarily any more expensive than an - // ordered ("normal") comparison. Whether these optimizations will be - // performed is ultimately up to the backend, but at least x86 does - // perform them. - let s0 = self.select(less_or_nan, int_min, fptosui_result); - let s1 = self.select(greater, int_max, s0); - - // Step 3: NaN replacement. - // For unsigned types, the above step already yielded int_ty::MIN == 0 if x is NaN. - // Therefore we only need to execute this step for signed integer types. - if signed { - // LLVM has no isNaN predicate, so we use (x == x) instead - let cmp = self.fcmp(RealPredicate::RealOEQ, x, x); - self.select(cmp, s1, zero) - } else { - s1 - } + if signed { self.fptosi_sat(x, dest_ty) } else { self.fptoui_sat(x, dest_ty) } } fn icmp(&mut self, op: IntPredicate, lhs: Self::Value, rhs: Self::Value) -> Self::Value; diff --git a/compiler/rustc_codegen_ssa/src/traits/consts.rs b/compiler/rustc_codegen_ssa/src/traits/consts.rs index 8a91d4735..fdc7a30e8 100644 --- a/compiler/rustc_codegen_ssa/src/traits/consts.rs +++ b/compiler/rustc_codegen_ssa/src/traits/consts.rs @@ -29,7 +29,6 @@ pub trait ConstMethods<'tcx>: BackendTypes { fn const_data_from_alloc(&self, alloc: ConstAllocation<'tcx>) -> Self::Value; fn scalar_to_backend(&self, cv: Scalar, layout: abi::Scalar, llty: Self::Type) -> Self::Value; - fn zst_to_backend(&self, llty: Self::Type) -> Self::Value; fn from_const_alloc( &self, layout: TyAndLayout<'tcx>, |