Add arm64e-apple-ios target

Cargo.lock

@@ -2659,9 +2659,9 @@ checksum = "830b246a0e5f20af87141b25c173cd1b609bd7779a4617d6ec582abaf90870f3"
 
 [[package]]
 name = "object"
-version = "0.32.0"
+version = "0.32.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "77ac5bbd07aea88c60a577a1ce218075ffd59208b2d7ca97adf9bfc5aeb21ebe"
+checksum = "9cf5f9dd3933bd50a9e1f149ec995f39ae2c496d31fd772c1fd45ebc27e902b0"
 dependencies = [
  "compiler_builtins",
  "crc32fast",

compiler/rustc_codegen_ssa/Cargo.toml

@@ -46,7 +46,7 @@ libc = "0.2.50"
 # tidy-alphabetical-end
 
 [dependencies.object]
-version = "0.32.0"
+version = "0.32.1"
 default-features = false
 features = ["read_core", "elf", "macho", "pe", "xcoff", "unaligned", "archive", "write"]
 

compiler/rustc_codegen_ssa/src/back/metadata.rs

@@ -226,6 +226,10 @@ pub(crate) fn create_object_file(sess: &Session) -> Option<write::Object<'static
 
     let mut file = write::Object::new(binary_format, architecture, endianness);
     if sess.target.is_like_osx {
+        if macho_is_arm64e(&sess.target) {
+            file.set_macho_cpu_subtype(object::macho::CPU_SUBTYPE_ARM64E);
+        }
+
         file.set_macho_build_version(macho_object_build_version_for_target(&sess.target))
     }
     if binary_format == BinaryFormat::Coff {
@@ -385,6 +389,11 @@ fn macho_object_build_version_for_target(target: &Target) -> object::write::Mach
     build_version
 }
 
+/// Is Apple's CPU subtype `arm64e`s
+fn macho_is_arm64e(target: &Target) -> bool {
+    return target.llvm_target.starts_with("arm64e");
+}
+
 pub enum MetadataPosition {
     First,
     Last,

compiler/rustc_target/src/spec/base/apple/mod.rs

@@ -9,11 +9,12 @@ mod tests;
 
 use Arch::*;
 #[allow(non_camel_case_types)]
-#[derive(Copy, Clone)]
+#[derive(Copy, Clone, PartialEq)]
 pub enum Arch {
     Armv7k,
     Armv7s,
     Arm64,
+    Arm64e,
     Arm64_32,
     I386,
     I686,
@@ -31,6 +32,7 @@ impl Arch {
             Armv7k => "armv7k",
             Armv7s => "armv7s",
             Arm64 | Arm64_macabi | Arm64_sim => "arm64",
+            Arm64e => "arm64e",
             Arm64_32 => "arm64_32",
             I386 => "i386",
             I686 => "i686",
@@ -42,7 +44,7 @@ impl Arch {
     pub fn target_arch(self) -> Cow<'static, str> {
         Cow::Borrowed(match self {
             Armv7k | Armv7s => "arm",
-            Arm64 | Arm64_32 | Arm64_macabi | Arm64_sim => "aarch64",
+            Arm64 | Arm64e | Arm64_32 | Arm64_macabi | Arm64_sim => "aarch64",
             I386 | I686 => "x86",
             X86_64 | X86_64_sim | X86_64_macabi | X86_64h => "x86_64",
         })
@@ -50,7 +52,7 @@ impl Arch {
 
     fn target_abi(self) -> &'static str {
         match self {
-            Armv7k | Armv7s | Arm64 | Arm64_32 | I386 | I686 | X86_64 | X86_64h => "",
+            Armv7k | Armv7s | Arm64 | Arm64e | Arm64_32 | I386 | I686 | X86_64 | X86_64h => "",
             X86_64_macabi | Arm64_macabi => "macabi",
             // x86_64-apple-ios is a simulator target, even though it isn't
             // declared that way in the target like the other ones...
@@ -63,6 +65,7 @@ impl Arch {
             Armv7k => "cortex-a8",
             Armv7s => "swift", // iOS 10 is only supported on iPhone 5 or higher.
             Arm64 => "apple-a7",
+            Arm64e => "apple-a12",
             Arm64_32 => "apple-s4",
             // Only macOS 10.12+ is supported, which means
             // all x86_64/x86 CPUs must be running at least penryn
@@ -88,7 +91,7 @@ fn pre_link_args(os: &'static str, arch: Arch, abi: &'static str) -> LinkArgs {
     };
 
     let platform_version: StaticCow<str> = match os {
-        "ios" => ios_lld_platform_version(),
+        "ios" => ios_lld_platform_version(arch),
         "tvos" => tvos_lld_platform_version(),
         "watchos" => watchos_lld_platform_version(),
         "macos" => macos_lld_platform_version(arch),
@@ -202,12 +205,22 @@ pub fn deployment_target(target: &Target) -> Option<(u32, u32)> {
     let (major, minor) = match &*target.os {
         "macos" => {
             // This does not need to be specific. It just needs to handle x86 vs M1.
-            let arch = if target.arch == "x86" || target.arch == "x86_64" { X86_64 } else { Arm64 };
+            let arch = match target.arch.as_ref() {
+                "x86" | "x86_64" => X86_64,
+                "arm64e" => Arm64e,
+                _ => Arm64,
+            };
             macos_deployment_target(arch)
         }
         "ios" => match &*target.abi {
             "macabi" => mac_catalyst_deployment_target(),
-            _ => ios_deployment_target(),
+            _ => {
+                let arch = match target.arch.as_ref() {
+                    "arm64e" => Arm64e,
+                    _ => Arm64,
+                };
+                ios_deployment_target(arch)
+            }
         },
         "watchos" => watchos_deployment_target(),
         "tvos" => tvos_deployment_target(),
@@ -228,7 +241,7 @@ fn from_set_deployment_target(var_name: &str) -> Option<(u32, u32)> {
 fn macos_default_deployment_target(arch: Arch) -> (u32, u32) {
     match arch {
         // Note: Arm64_sim is not included since macOS has no simulator.
-        Arm64 | Arm64_macabi => (11, 0),
+        Arm64 | Arm64e | Arm64_macabi => (11, 0),
         _ => (10, 12),
     }
 }
@@ -280,8 +293,8 @@ fn link_env_remove(arch: Arch, os: &'static str) -> StaticCow<[StaticCow<str>]>
         // Otherwise if cross-compiling for a different OS/SDK, remove any part
         // of the linking environment that's wrong and reversed.
         match arch {
-            Armv7k | Armv7s | Arm64 | Arm64_32 | I386 | I686 | X86_64 | X86_64_sim | X86_64h
+            Armv7k | Armv7s | Arm64 | Arm64e | Arm64_32 | I386 | I686 | X86_64 | X86_64_sim
-            | Arm64_sim => {
+            | X86_64h | Arm64_sim => {
                 cvs!["MACOSX_DEPLOYMENT_TARGET"]
             }
             X86_64_macabi | Arm64_macabi => cvs!["IPHONEOS_DEPLOYMENT_TARGET"],
@@ -289,9 +302,10 @@ fn link_env_remove(arch: Arch, os: &'static str) -> StaticCow<[StaticCow<str>]>
     }
 }
 
-fn ios_deployment_target() -> (u32, u32) {
+fn ios_deployment_target(arch: Arch) -> (u32, u32) {
     // If you are looking for the default deployment target, prefer `rustc --print deployment-target`.
-    from_set_deployment_target("IPHONEOS_DEPLOYMENT_TARGET").unwrap_or((10, 0))
+    let (major, minor) = if arch == Arm64e { (14, 0) } else { (10, 0) };
+    from_set_deployment_target("IPHONEOS_DEPLOYMENT_TARGET").unwrap_or((major, minor))
 }
 
 fn mac_catalyst_deployment_target() -> (u32, u32) {
@@ -306,17 +320,17 @@ pub fn ios_llvm_target(arch: Arch) -> String {
     // set high enough. Luckily one LC_BUILD_VERSION is enough, for Xcode
     // to pick it up (since std and core are still built with the fallback
     // of version 7.0 and hence emit the old LC_IPHONE_MIN_VERSION).
-    let (major, minor) = ios_deployment_target();
+    let (major, minor) = ios_deployment_target(arch);
     format!("{}-apple-ios{}.{}.0", arch.target_name(), major, minor)
 }
 
-fn ios_lld_platform_version() -> String {
+fn ios_lld_platform_version(arch: Arch) -> String {
-    let (major, minor) = ios_deployment_target();
+    let (major, minor) = ios_deployment_target(arch);
     format!("{major}.{minor}")
 }
 
 pub fn ios_sim_llvm_target(arch: Arch) -> String {
-    let (major, minor) = ios_deployment_target();
+    let (major, minor) = ios_deployment_target(arch);
     format!("{}-apple-ios{}.{}.0-simulator", arch.target_name(), major, minor)
 }
 

compiler/rustc_target/src/spec/mod.rs

@@ -1566,6 +1566,7 @@ supported_targets! {
     ("i386-apple-ios", i386_apple_ios),
     ("x86_64-apple-ios", x86_64_apple_ios),
     ("aarch64-apple-ios", aarch64_apple_ios),
+    ("arm64e-apple-ios", arm64e_apple_ios),
     ("armv7s-apple-ios", armv7s_apple_ios),
     ("x86_64-apple-ios-macabi", x86_64_apple_ios_macabi),
     ("aarch64-apple-ios-macabi", aarch64_apple_ios_macabi),

compiler/rustc_target/src/spec/targets/arm64e_apple_ios.rs

@@ -0,0 +1,30 @@
+use crate::spec::base::apple::{ios_llvm_target, opts, Arch};
+use crate::spec::{FramePointer, SanitizerSet, Target, TargetOptions};
+
+pub fn target() -> Target {
+    let arch = Arch::Arm64e;
+    let mut base = opts("ios", arch);
+    base.supported_sanitizers = SanitizerSet::ADDRESS | SanitizerSet::THREAD;
+
+    Target {
+        llvm_target: ios_llvm_target(arch).into(),
+        pointer_width: 64,
+        data_layout: "e-m:o-i64:64-i128:128-n32:64-S128".into(),
+        arch: arch.target_arch(),
+        options: TargetOptions {
+            features: "+neon,+fp-armv8,+apple-a12,+v8.3a,+paca,+pacg".into(),
+            max_atomic_width: Some(128),
+            forces_embed_bitcode: true,
+            frame_pointer: FramePointer::NonLeaf,
+            bitcode_llvm_cmdline: "-triple\0\
+                arm64e-apple-ios14.1.0\0\
+                -emit-obj\0\
+                -disable-llvm-passes\0\
+                -target-abi\0\
+                darwinpcs\0\
+                -Os\0"
+                .into(),
+            ..base
+        },
+    }
+}

src/doc/rustc/src/SUMMARY.md

@@ -15,6 +15,7 @@
 - [Platform Support](platform-support.md)
     - [Target Tier Policy](target-tier-policy.md)
     - [Template for Target-specific Documentation](platform-support/TEMPLATE.md)
+    - [arm64e-apple-ios.md](platform-support/arm64e-apple-ios.md)
     - [aarch64-apple-ios-sim](platform-support/aarch64-apple-ios-sim.md)
     - [\*-apple-tvos](platform-support/apple-tvos.md)
     - [\*-apple-watchos\*](platform-support/apple-watchos.md)

src/doc/rustc/src/platform-support.md

@@ -216,6 +216,7 @@ host tools.
 
 target | std | host | notes
 -------|:---:|:----:|-------
+[`arm64e-apple-ios`](platform-support/arm64e-apple-ios.md) | ✓ | | ARM64e Apple iOS
 `aarch64-apple-ios-macabi` | ? |  | Apple Catalyst on ARM64
 [`aarch64-apple-tvos`](platform-support/apple-tvos.md) | ? |  | ARM64 tvOS
 [`aarch64-apple-tvos-sim`](platform-support/apple-tvos.md) | ? |  | ARM64 tvOS Simulator

src/doc/rustc/src/platform-support/arm64e-apple-ios.md

@@ -0,0 +1,37 @@
+# `arm64e-apple-ios`
+
+**Tier: 3**
+
+ARM64e iOS (12.0+)
+
+## Target maintainers
+
+- Artyom Tetyukhin ([@arttet](https://github.com/https://github.com/arttet))
+
+## Requirements
+
+These targets only support cross-compilation.
+The targets do support `std`.
+
+## Building the target
+
+You can build Rust with support for the targets by adding it to the `target` list in `config.toml`:
+
+```toml
+[build]
+target = [ "arm64e-apple-ios" ]
+```
+
+## Building Rust programs
+
+Rust does not yet ship pre-compiled artifacts for this target.
+To compile for this target, you will need to build Rust with the target enabled (see [Building the target](#building-the-target) above).
+
+## Testing
+
+The target does support running binaries on iOS platforms with `arm64e` architecture.
+
+## Cross-compilation toolchains and C code
+
+The targets do support `C` code.
+To build compatible `C` code, you have to use XCode with the same compiler and flags.

src/tools/build-manifest/src/main.rs

@@ -51,6 +51,7 @@ static HOSTS: &[&str] = &[
 static TARGETS: &[&str] = &[
     "aarch64-apple-darwin",
     "aarch64-apple-ios",
+    "arm64e-apple-ios",
     "aarch64-apple-ios-sim",
     "aarch64-unknown-fuchsia",
     "aarch64-linux-android",