[watchos] add target specs for watchos armv7k and arm64_32

[watchos] Add spec for x86_64-apple-watchos-sim

Author: vladimir-ea

compiler/rustc_codegen_llvm/src/back/write.rs

@@ -1035,7 +1035,8 @@ unsafe fn embed_bitcode(
     // reason (see issue #90326 for historical background).
     let is_apple = cgcx.opts.target_triple.triple().contains("-ios")
         || cgcx.opts.target_triple.triple().contains("-darwin")
-        || cgcx.opts.target_triple.triple().contains("-tvos");
+        || cgcx.opts.target_triple.triple().contains("-tvos")
+        || cgcx.opts.target_triple.triple().contains("-watchos");
     if is_apple
         || cgcx.opts.target_triple.triple().starts_with("wasm")
         || cgcx.opts.target_triple.triple().starts_with("asmjs")

compiler/rustc_target/src/spec/apple_base.rs

@@ -114,3 +114,12 @@ pub fn ios_sim_llvm_target(arch: &str) -> String {
     let (major, minor) = ios_deployment_target();
     format!("{}-apple-ios{}.{}.0-simulator", arch, major, minor)
 }
+
+fn watchos_deployment_target() -> (u32, u32) {
+    deployment_target("WATCHOS_DEPLOYMENT_TARGET").unwrap_or((5, 0))
+}
+
+pub fn watchos_sim_llvm_target(arch: &str) -> String {
+    let (major, minor) = watchos_deployment_target();
+    format!("{}-apple-watchos{}.{}.0-simulator", arch, major, minor)
+}

compiler/rustc_target/src/spec/apple_sdk_base.rs

@@ -5,8 +5,10 @@ use Arch::*;
 #[derive(Copy, Clone)]
 pub enum Arch {
     Armv7,
+    Armv7k,
     Armv7s,
     Arm64,
+    Arm64_32,
     I386,
     X86_64,
     X86_64_macabi,
@@ -26,8 +28,10 @@ fn target_abi(arch: Arch) -> String {
 fn target_cpu(arch: Arch) -> String {
     match arch {
         Armv7 => "cortex-a8", // iOS7 is supported on iPhone 4 and higher
+        Armv7k => "cortex-a8",
         Armv7s => "cortex-a9",
         Arm64 => "apple-a7",
+        Arm64_32 => "apple-s4",
         I386 => "yonah",
         X86_64 => "core2",
         X86_64_macabi => "core2",
@@ -39,7 +43,7 @@ fn target_cpu(arch: Arch) -> String {
 
 fn link_env_remove(arch: Arch) -> Vec<String> {
     match arch {
-        Armv7 | Armv7s | Arm64 | I386 | X86_64 | Arm64_sim => {
+        Armv7 | Armv7k | Armv7s | Arm64 | Arm64_32 | I386 | X86_64 | Arm64_sim => {
             vec!["MACOSX_DEPLOYMENT_TARGET".to_string()]
         }
         X86_64_macabi | Arm64_macabi => vec!["IPHONEOS_DEPLOYMENT_TARGET".to_string()],

compiler/rustc_target/src/spec/arm64_32_apple_watchos.rs

@@ -0,0 +1,29 @@
+use super::apple_sdk_base::{opts, Arch};
+use crate::spec::{Target, TargetOptions};
+
+pub fn target() -> Target {
+    let base = opts("watchos", Arch::Arm64_32);
+    Target {
+        llvm_target: "arm64_32-apple-watchos".to_string(),
+        pointer_width: 32,
+        data_layout: "e-m:o-p:32:32-i64:64-i128:128-n32:64-S128".to_string(),
+        arch: "aarch64".to_string(),
+        options: TargetOptions {
+            features: "+neon,+fp-armv8,+apple-a7".to_string(),
+            max_atomic_width: Some(64),
+            unsupported_abis: super::arm_base::unsupported_abis(),
+            forces_embed_bitcode: true,
+            // These arguments are not actually invoked - they just have
+            // to look right to pass App Store validation.
+            bitcode_llvm_cmdline: "-triple\0\
+                arm64_32-apple-watchos5.0.0\0\
+                -emit-obj\0\
+                -disable-llvm-passes\0\
+                -target-abi\0\
+                darwinpcs\0\
+                -Os\0"
+                .to_string(),
+            ..base
+        },
+    }
+}

compiler/rustc_target/src/spec/armv7k_apple_watchos.rs

@@ -0,0 +1,18 @@
+use super::apple_sdk_base::{opts, Arch};
+use crate::spec::{Target, TargetOptions};
+
+pub fn target() -> Target {
+    let base = opts("watchos", Arch::Armv7k);
+    Target {
+        llvm_target: "armv7k-apple-watchos".to_string(),
+        pointer_width: 32,
+        data_layout: "e-m:o-p:32:32-Fi8-i64:64-a:0:32-n32-S128".to_string(),
+        arch: "arm".to_string(),
+        options: TargetOptions {
+            features: "+v7".to_string(),
+            max_atomic_width: Some(64),
+            unsupported_abis: super::arm_base::unsupported_abis(),
+            ..base
+        },
+    }
+}

compiler/rustc_target/src/spec/mod.rs

@@ -923,6 +923,10 @@ supported_targets! {
     ("aarch64-apple-tvos", aarch64_apple_tvos),
     ("x86_64-apple-tvos", x86_64_apple_tvos),
 
+    ("armv7k-apple-watchos", armv7k_apple_watchos),
+    ("arm64_32-apple-watchos", arm64_32_apple_watchos),
+    ("x86_64-apple-watchos-sim", x86_64_apple_watchos_sim),
+
     ("armebv7r-none-eabi", armebv7r_none_eabi),
     ("armebv7r-none-eabihf", armebv7r_none_eabihf),
     ("armv7r-none-eabi", armv7r_none_eabi),

compiler/rustc_target/src/spec/x86_64_apple_watchos_sim.rs

@@ -0,0 +1,34 @@
+use super::apple_sdk_base::{opts, Arch};
+use crate::spec::{StackProbeType, Target, TargetOptions};
+
+pub fn target() -> Target {
+    let base = opts("watchos", Arch::X86_64);
+
+    let arch = "x86_64";
+    let llvm_target = super::apple_base::watchos_sim_llvm_target(arch);
+
+    Target {
+        llvm_target: llvm_target,
+        pointer_width: 64,
+        data_layout: "e-m:o-i64:64-f80:128-n8:16:32:64-S128".to_string(),
+        arch: "x86_64".to_string(),
+        options: TargetOptions {
+            max_atomic_width: Some(64),
+            // don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
+            stack_probes: StackProbeType::Call,
+            forces_embed_bitcode: true,
+            // Taken from a clang build on Xcode 11.4.1.
+            // These arguments are not actually invoked - they just have
+            // to look right to pass App Store validation.
+            bitcode_llvm_cmdline: "-triple\0\
+                x86_64-apple-watchos5.0-simulator\0\
+                -emit-obj\0\
+                -disable-llvm-passes\0\
+                -target-abi\0\
+                darwinpcs\0\
+                -Os\0"
+                .to_string(),
+            ..base
+        },
+    }
+}

library/panic_unwind/src/dwarf/eh.rs

@@ -49,7 +49,8 @@ pub enum EHAction {
     Terminate,
 }
 
-pub const USING_SJLJ_EXCEPTIONS: bool = cfg!(all(target_os = "ios", target_arch = "arm"));
+pub const USING_SJLJ_EXCEPTIONS: bool =
+    cfg!(all(any(target_os = "ios", target_os = "watchos"), target_arch = "arm"));
 
 pub unsafe fn find_eh_action(lsda: *const u8, context: &EHContext<'_>) -> Result<EHAction, ()> {
     if lsda.is_null() {

library/panic_unwind/src/gcc.rs

@@ -131,7 +131,7 @@ const UNWIND_DATA_REG: (i32, i32) = (10, 11); // x10, x11
 // https://github.com/gcc-mirror/gcc/blob/trunk/libgcc/unwind-c.c
 
 cfg_if::cfg_if! {
-    if #[cfg(all(target_arch = "arm", not(target_os = "ios"), not(target_os = "netbsd")))] {
+    if #[cfg(all(target_arch = "arm", not(target_os = "ios"), not(target_os = "watchos"), not(target_os = "netbsd")))] {
         // ARM EHABI personality routine.
         // https://infocenter.arm.com/help/topic/com.arm.doc.ihi0038b/IHI0038B_ehabi.pdf
         //

library/std/build.rs

@@ -15,6 +15,7 @@ fn main() {
         || target.contains("illumos")
         || target.contains("apple-darwin")
         || target.contains("apple-ios")
+        || target.contains("apple-watchos")
         || target.contains("uwp")
         || target.contains("windows")
         || target.contains("fuchsia")

library/unwind/src/libunwind.rs

@@ -30,10 +30,10 @@ pub const unwinder_private_data_size: usize = 5;
 #[cfg(target_arch = "x86_64")]
 pub const unwinder_private_data_size: usize = 6;
 
-#[cfg(all(target_arch = "arm", not(target_os = "ios")))]
+#[cfg(all(target_arch = "arm", not(any(target_os = "ios", target_os = "watchos"))))]
 pub const unwinder_private_data_size: usize = 20;
 
-#[cfg(all(target_arch = "arm", target_os = "ios"))]
+#[cfg(all(target_arch = "arm", any(target_os = "ios", target_os = "watchos")))]
 pub const unwinder_private_data_size: usize = 5;
 
 #[cfg(all(target_arch = "aarch64", target_pointer_width = "64"))]
@@ -105,7 +105,7 @@ extern "C" {
 }
 
 cfg_if::cfg_if! {
-if #[cfg(any(target_os = "ios", target_os = "netbsd", not(target_arch = "arm")))] {
+if #[cfg(any(target_os = "ios", target_os = "watchos", target_os = "netbsd", not(target_arch = "arm")))] {
     // Not ARM EHABI
     #[repr(C)]
     #[derive(Copy, Clone, PartialEq)]
@@ -240,7 +240,7 @@ if #[cfg(any(target_os = "ios", target_os = "netbsd", not(target_arch = "arm")))
 } // cfg_if!
 
 cfg_if::cfg_if! {
-if #[cfg(not(all(target_os = "ios", target_arch = "arm")))] {
+if #[cfg(not(all(any(target_os = "ios", target_os = "watchos"), target_arch = "arm")))] {
     // Not 32-bit iOS
     #[cfg_attr(
         all(feature = "llvm-libunwind", any(target_os = "fuchsia", target_os = "linux")),