Rollup of 9 pull requests

Cargo.lock

@@ -447,9 +447,9 @@ version = "0.1.0"
 
 [[package]]
 name = "cc"
-version = "1.0.79"
+version = "1.0.88"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "50d30906286121d95be3d479533b458f87493b30a4b5f79a607db8f5d11aa91f"
+checksum = "02f341c093d19155a6e41631ce5971aac4e9a868262212153124c15fa22d1cdc"
 
 [[package]]
 name = "cfg-if"

compiler/rustc_codegen_llvm/src/back/archive.rs

@@ -55,6 +55,7 @@ fn llvm_machine_type(cpu: &str) -> LLVMMachineType {
         "x86_64" => LLVMMachineType::AMD64,
         "x86" => LLVMMachineType::I386,
         "aarch64" => LLVMMachineType::ARM64,
+        "arm64ec" => LLVMMachineType::ARM64EC,
         "arm" => LLVMMachineType::ARM,
         _ => panic!("unsupported cpu type {cpu}"),
     }

compiler/rustc_codegen_llvm/src/llvm/ffi.rs

@@ -56,6 +56,7 @@ pub enum LLVMMachineType {
     AMD64 = 0x8664,
     I386 = 0x14c,
     ARM64 = 0xaa64,
+    ARM64EC = 0xa641,
     ARM = 0x01c0,
 }
 

compiler/rustc_codegen_llvm/src/llvm_util.rs

@@ -204,7 +204,13 @@ impl<'a> IntoIterator for LLVMFeature<'a> {
 // which might lead to failures if the oldest tested / supported LLVM version
 // doesn't yet support the relevant intrinsics
 pub fn to_llvm_features<'a>(sess: &Session, s: &'a str) -> LLVMFeature<'a> {
-    let arch = if sess.target.arch == "x86_64" { "x86" } else { &*sess.target.arch };
+    let arch = if sess.target.arch == "x86_64" {
+        "x86"
+    } else if sess.target.arch == "arm64ec" {
+        "aarch64"
+    } else {
+        &*sess.target.arch
+    };
     match (arch, s) {
         ("x86", "sse4.2") => {
             LLVMFeature::with_dependency("sse4.2", TargetFeatureFoldStrength::EnableOnly("crc32"))

compiler/rustc_codegen_llvm/src/va_arg.rs

@@ -266,7 +266,7 @@ pub(super) fn emit_va_arg<'ll, 'tcx>(
         // Generic x86
         "x86" => emit_ptr_va_arg(bx, addr, target_ty, false, Align::from_bytes(4).unwrap(), true),
         // Windows AArch64
-        "aarch64" if target.is_like_windows => {
+        "aarch64" | "arm64ec" if target.is_like_windows => {
             emit_ptr_va_arg(bx, addr, target_ty, false, Align::from_bytes(8).unwrap(), false)
         }
         // macOS / iOS AArch64

compiler/rustc_codegen_ssa/Cargo.toml

@@ -7,7 +7,7 @@ edition = "2021"
 # tidy-alphabetical-start
 ar_archive_writer = "0.1.5"
 bitflags = "2.4.1"
-cc = "1.0.69"
+cc = "1.0.88"
 itertools = "0.11"
 jobserver = "0.1.28"
 pathdiff = "0.2.0"

compiler/rustc_codegen_ssa/src/back/metadata.rs

@@ -8,7 +8,7 @@ use std::path::Path;
 use object::write::{self, StandardSegment, Symbol, SymbolSection};
 use object::{
     elf, pe, xcoff, Architecture, BinaryFormat, Endianness, FileFlags, Object, ObjectSection,
-    ObjectSymbol, SectionFlags, SectionKind, SymbolFlags, SymbolKind, SymbolScope,
+    ObjectSymbol, SectionFlags, SectionKind, SubArchitecture, SymbolFlags, SymbolKind, SymbolScope,
 };
 
 use rustc_data_structures::memmap::Mmap;
@@ -182,37 +182,40 @@ pub(crate) fn create_object_file(sess: &Session) -> Option<write::Object<'static
         Endian::Little => Endianness::Little,
         Endian::Big => Endianness::Big,
     };
-    let architecture = match &sess.target.arch[..] {
-        "arm" => Architecture::Arm,
-        "aarch64" => {
+    let (architecture, sub_architecture) = match &sess.target.arch[..] {
+        "arm" => (Architecture::Arm, None),
+        "aarch64" => (
             if sess.target.pointer_width == 32 {
                 Architecture::Aarch64_Ilp32
             } else {
                 Architecture::Aarch64
-            }
-        }
-        "x86" => Architecture::I386,
-        "s390x" => Architecture::S390x,
-        "mips" | "mips32r6" => Architecture::Mips,
-        "mips64" | "mips64r6" => Architecture::Mips64,
-        "x86_64" => {
+            },
+            None,
+        ),
+        "x86" => (Architecture::I386, None),
+        "s390x" => (Architecture::S390x, None),
+        "mips" | "mips32r6" => (Architecture::Mips, None),
+        "mips64" | "mips64r6" => (Architecture::Mips64, None),
+        "x86_64" => (
             if sess.target.pointer_width == 32 {
                 Architecture::X86_64_X32
             } else {
                 Architecture::X86_64
-            }
-        }
-        "powerpc" => Architecture::PowerPc,
-        "powerpc64" => Architecture::PowerPc64,
-        "riscv32" => Architecture::Riscv32,
-        "riscv64" => Architecture::Riscv64,
-        "sparc64" => Architecture::Sparc64,
-        "avr" => Architecture::Avr,
-        "msp430" => Architecture::Msp430,
-        "hexagon" => Architecture::Hexagon,
-        "bpf" => Architecture::Bpf,
-        "loongarch64" => Architecture::LoongArch64,
-        "csky" => Architecture::Csky,
+            },
+            None,
+        ),
+        "powerpc" => (Architecture::PowerPc, None),
+        "powerpc64" => (Architecture::PowerPc64, None),
+        "riscv32" => (Architecture::Riscv32, None),
+        "riscv64" => (Architecture::Riscv64, None),
+        "sparc64" => (Architecture::Sparc64, None),
+        "avr" => (Architecture::Avr, None),
+        "msp430" => (Architecture::Msp430, None),
+        "hexagon" => (Architecture::Hexagon, None),
+        "bpf" => (Architecture::Bpf, None),
+        "loongarch64" => (Architecture::LoongArch64, None),
+        "csky" => (Architecture::Csky, None),
+        "arm64ec" => (Architecture::Aarch64, Some(SubArchitecture::Arm64EC)),
         // Unsupported architecture.
         _ => return None,
     };
@@ -227,6 +230,7 @@ pub(crate) fn create_object_file(sess: &Session) -> Option<write::Object<'static
     };
 
     let mut file = write::Object::new(binary_format, architecture, endianness);
+    file.set_sub_architecture(sub_architecture);
     if sess.target.is_like_osx {
         if macho_is_arm64e(&sess.target) {
             file.set_macho_cpu_subtype(object::macho::CPU_SUBTYPE_ARM64E);

compiler/rustc_codegen_ssa/src/back/symbol_export.rs

@@ -563,9 +563,10 @@ pub fn linking_symbol_name_for_instance_in_crate<'tcx>(
         return undecorated;
     }
 
-    let x86 = match &target.arch[..] {
-        "x86" => true,
-        "x86_64" => false,
+    let prefix = match &target.arch[..] {
+        "x86" => Some('_'),
+        "x86_64" => None,
+        "arm64ec" => Some('#'),
         // Only x86/64 use symbol decorations.
         _ => return undecorated,
     };
@@ -602,8 +603,8 @@ pub fn linking_symbol_name_for_instance_in_crate<'tcx>(
         Conv::X86Stdcall => ("_", "@"),
         Conv::X86VectorCall => ("", "@@"),
         _ => {
-            if x86 {
-                undecorated.insert(0, '_');
+            if let Some(prefix) = prefix {
+                undecorated.insert(0, prefix);
             }
             return undecorated;
         }

compiler/rustc_codegen_ssa/src/base.rs

@@ -907,7 +907,11 @@ impl CrateInfo {
                     lang_items::required(tcx, l).then_some(name)
                 })
                 .collect();
-            let prefix = if target.is_like_windows && target.arch == "x86" { "_" } else { "" };
+            let prefix = match (target.is_like_windows, target.arch.as_ref()) {
+                (true, "x86") => "_",
+                (true, "arm64ec") => "#",
+                _ => "",
+            };
 
             // This loop only adds new items to values of the hash map, so the order in which we
             // iterate over the values is not important.

compiler/rustc_infer/src/infer/error_reporting/mod.rs

@@ -1247,10 +1247,23 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
             (&ty::Adt(def1, sub1), &ty::Adt(def2, sub2)) => {
                 let did1 = def1.did();
                 let did2 = def2.did();
-                let sub_no_defaults_1 =
-                    self.tcx.generics_of(did1).own_args_no_defaults(self.tcx, sub1);
-                let sub_no_defaults_2 =
-                    self.tcx.generics_of(did2).own_args_no_defaults(self.tcx, sub2);
+
+                let generics1 = self.tcx.generics_of(did1);
+                let generics2 = self.tcx.generics_of(did2);
+
+                let non_default_after_default = generics1
+                    .check_concrete_type_after_default(self.tcx, sub1)
+                    || generics2.check_concrete_type_after_default(self.tcx, sub2);
+                let sub_no_defaults_1 = if non_default_after_default {
+                    generics1.own_args(sub1)
+                } else {
+                    generics1.own_args_no_defaults(self.tcx, sub1)
+                };
+                let sub_no_defaults_2 = if non_default_after_default {
+                    generics2.own_args(sub2)
+                } else {
+                    generics2.own_args_no_defaults(self.tcx, sub2)
+                };
                 let mut values = (DiagStyledString::new(), DiagStyledString::new());
                 let path1 = self.tcx.def_path_str(did1);
                 let path2 = self.tcx.def_path_str(did2);

compiler/rustc_llvm/Cargo.toml

@@ -8,12 +8,7 @@ edition = "2021"
 libc = "0.2.73"
 # tidy-alphabetical-end
 
-# FIXME: updating cc past 1.0.79 breaks libstd bootstrapping, pin
-# to the last working version here so `cargo update` doesn't cause the
-# a higher version to be selected
-# https://github.com/rust-lang/cc-rs/issues/913
-# 1.0.{84, 85} fix this but have been yanked
 [build-dependencies]
 # tidy-alphabetical-start
-cc = "=1.0.79"
+cc = "1.0.79"
 # tidy-alphabetical-end

compiler/rustc_middle/src/ty/generics.rs

@@ -360,6 +360,30 @@ impl<'tcx> Generics {
         let own = &args[self.parent_count..][..self.params.len()];
         if self.has_self && self.parent.is_none() { &own[1..] } else { own }
     }
+
+    /// Returns true if a concrete type is specified after a default type.
+    /// For example, consider `struct T<W = usize, X = Vec<W>>(W, X)`
+    /// `T<usize, String>` will return true
+    /// `T<usize>` will return false
+    pub fn check_concrete_type_after_default(
+        &'tcx self,
+        tcx: TyCtxt<'tcx>,
+        args: &'tcx [ty::GenericArg<'tcx>],
+    ) -> bool {
+        let mut default_param_seen = false;
+        for param in self.params.iter() {
+            if let Some(inst) =
+                param.default_value(tcx).map(|default| default.instantiate(tcx, args))
+            {
+                if inst == args[param.index as usize] {
+                    default_param_seen = true;
+                } else if default_param_seen {
+                    return true;
+                }
+            }
+        }
+        false
+    }
 }
 
 /// Bounds on generics.

compiler/rustc_mir_build/src/build/matches/mod.rs

@@ -93,8 +93,14 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                     variable_source_info,
                     true,
                 ));
-                this.cfg.goto(lhs_success_block, variable_source_info, rhs_success_block);
-                rhs_success_block.unit()
+
+                // Make the LHS and RHS success arms converge to a common block.
+                // (We can't just make LHS goto RHS, because `rhs_success_block`
+                // might contain statements that we don't want on the LHS path.)
+                let success_block = this.cfg.start_new_block();
+                this.cfg.goto(lhs_success_block, variable_source_info, success_block);
+                this.cfg.goto(rhs_success_block, variable_source_info, success_block);
+                success_block.unit()
             }
             ExprKind::Unary { op: UnOp::Not, arg } => {
                 let local_scope = this.local_scope();

compiler/rustc_symbol_mangling/src/typeid.rs

@@ -4,13 +4,13 @@
 /// For more information about LLVM CFI and cross-language LLVM CFI support for the Rust compiler,
 /// see design document in the tracking issue #89653.
 use bitflags::bitflags;
-use rustc_middle::ty::{FnSig, Instance, Ty, TyCtxt};
+use rustc_middle::ty::{Instance, Ty, TyCtxt};
 use rustc_target::abi::call::FnAbi;
 use std::hash::Hasher;
 use twox_hash::XxHash64;
 
 bitflags! {
-    /// Options for typeid_for_fnabi and typeid_for_fnsig.
+    /// Options for typeid_for_fnabi.
     #[derive(Clone, Copy, Debug)]
     pub struct TypeIdOptions: u32 {
         const GENERALIZE_POINTERS = 1;
@@ -30,15 +30,6 @@ pub fn typeid_for_fnabi<'tcx>(
     typeid_itanium_cxx_abi::typeid_for_fnabi(tcx, fn_abi, options)
 }
 
-/// Returns a type metadata identifier for the specified FnSig.
-pub fn typeid_for_fnsig<'tcx>(
-    tcx: TyCtxt<'tcx>,
-    fn_sig: &FnSig<'tcx>,
-    options: TypeIdOptions,
-) -> String {
-    typeid_itanium_cxx_abi::typeid_for_fnsig(tcx, fn_sig, options)
-}
-
 /// Returns a type metadata identifier for the specified Instance.
 pub fn typeid_for_instance<'tcx>(
     tcx: TyCtxt<'tcx>,
@@ -61,19 +52,6 @@ pub fn kcfi_typeid_for_fnabi<'tcx>(
     hash.finish() as u32
 }
 
-/// Returns a KCFI type metadata identifier for the specified FnSig.
-pub fn kcfi_typeid_for_fnsig<'tcx>(
-    tcx: TyCtxt<'tcx>,
-    fn_sig: &FnSig<'tcx>,
-    options: TypeIdOptions,
-) -> u32 {
-    // A KCFI type metadata identifier is a 32-bit constant produced by taking the lower half of the
-    // xxHash64 of the type metadata identifier. (See llvm/llvm-project@cff5bef.)
-    let mut hash: XxHash64 = Default::default();
-    hash.write(typeid_itanium_cxx_abi::typeid_for_fnsig(tcx, fn_sig, options).as_bytes());
-    hash.finish() as u32
-}
-
 /// Returns a KCFI type metadata identifier for the specified Instance.
 pub fn kcfi_typeid_for_instance<'tcx>(
     tcx: TyCtxt<'tcx>,

compiler/rustc_symbol_mangling/src/typeid/typeid_itanium_cxx_abi.rs

@@ -1072,41 +1072,6 @@ pub fn typeid_for_fnabi<'tcx>(
     typeid
 }
 
-/// Returns a type metadata identifier for the specified FnSig using the Itanium C++ ABI with vendor
-/// extended type qualifiers and types for Rust types that are not used at the FFI boundary.
-pub fn typeid_for_fnsig<'tcx>(
-    tcx: TyCtxt<'tcx>,
-    fn_sig: &FnSig<'tcx>,
-    options: TypeIdOptions,
-) -> String {
-    // A name is mangled by prefixing "_Z" to an encoding of its name, and in the case of functions
-    // its type.
-    let mut typeid = String::from("_Z");
-
-    // Clang uses the Itanium C++ ABI's virtual tables and RTTI typeinfo structure name as type
-    // metadata identifiers for function pointers. The typeinfo name encoding is a two-character
-    // code (i.e., 'TS') prefixed to the type encoding for the function.
-    typeid.push_str("TS");
-
-    // A dictionary of substitution candidates used for compression (see
-    // https://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangling-compression).
-    let mut dict: FxHashMap<DictKey<'tcx>, usize> = FxHashMap::default();
-
-    // Encode the function signature
-    typeid.push_str(&encode_fnsig(tcx, fn_sig, &mut dict, options));
-
-    // Add encoding suffixes
-    if options.contains(EncodeTyOptions::NORMALIZE_INTEGERS) {
-        typeid.push_str(".normalized");
-    }
-
-    if options.contains(EncodeTyOptions::GENERALIZE_POINTERS) {
-        typeid.push_str(".generalized");
-    }
-
-    typeid
-}
-
 /// Returns a type metadata identifier for the specified Instance using the Itanium C++ ABI with
 /// vendor extended type qualifiers and types for Rust types that are not used at the FFI boundary.
 pub fn typeid_for_instance<'tcx>(

compiler/rustc_target/src/abi/call/mod.rs

@@ -814,7 +814,7 @@ impl<'a, Ty> FnAbi<'a, Ty> {
                     }
                 }
             },
-            "aarch64" => {
+            "aarch64" | "arm64ec" => {
                 let kind = if cx.target_spec().is_like_osx {
                     aarch64::AbiKind::DarwinPCS
                 } else if cx.target_spec().is_like_windows {

compiler/rustc_target/src/spec/mod.rs

@@ -1562,6 +1562,7 @@ supported_targets! {
 
     ("aarch64-pc-windows-msvc", aarch64_pc_windows_msvc),
     ("aarch64-uwp-windows-msvc", aarch64_uwp_windows_msvc),
+    ("arm64ec-pc-windows-msvc", arm64ec_pc_windows_msvc),
     ("x86_64-pc-windows-msvc", x86_64_pc_windows_msvc),
     ("x86_64-uwp-windows-msvc", x86_64_uwp_windows_msvc),
     ("x86_64-win7-windows-msvc", x86_64_win7_windows_msvc),
@@ -1575,6 +1576,7 @@ supported_targets! {
     ("wasm32-unknown-emscripten", wasm32_unknown_emscripten),
     ("wasm32-unknown-unknown", wasm32_unknown_unknown),
     ("wasm32-wasi", wasm32_wasi),
+    ("wasm32-wasip1", wasm32_wasip1),
     ("wasm32-wasip2", wasm32_wasip2),
     ("wasm32-wasi-preview1-threads", wasm32_wasi_preview1_threads),
     ("wasm64-unknown-unknown", wasm64_unknown_unknown),