std: Get the standard library compiling for wasm64

This commit goes through and updates various `#[cfg]` as appropriate to
get the wasm64-unknown-unknown target behaving similarly to the
wasm32-unknown-unknown target. Most of this is just updating various
conditions for `target_arch = "wasm32"` to also account for `target_arch
= "wasm64"` where appropriate. This commit also lists `wasm64` as an
allow-listed architecture to not have the `restricted_std` feature
enabled, enabling experimentation with `-Z build-std` externally.

The main goal of this commit is to enable playing around with
`wasm64-unknown-unknown` externally via `-Z build-std` in a way that's
similar to the `wasm32-unknown-unknown` target. These targets are
effectively the same and only differ in their pointer size, but wasm64
is much newer and has much less ecosystem/library support so it'll still
take time to get wasm64 fully-fledged.

Author: alexcrichton

core/src/ffi.rs

@@ -63,6 +63,7 @@ impl fmt::Debug for c_void {
     all(not(target_arch = "aarch64"), not(target_arch = "powerpc"), not(target_arch = "x86_64")),
     all(target_arch = "aarch64", any(target_os = "macos", target_os = "ios")),
     target_arch = "wasm32",
+    target_arch = "wasm64",
     target_arch = "asmjs",
     windows
 ))]
@@ -86,6 +87,7 @@ pub struct VaListImpl<'f> {
     all(not(target_arch = "aarch64"), not(target_arch = "powerpc"), not(target_arch = "x86_64")),
     all(target_arch = "aarch64", any(target_os = "macos", target_os = "ios")),
     target_arch = "wasm32",
+    target_arch = "wasm64",
     target_arch = "asmjs",
     windows
 ))]
@@ -186,6 +188,7 @@ pub struct VaList<'a, 'f: 'a> {
         ),
         all(target_arch = "aarch64", any(target_os = "macos", target_os = "ios")),
         target_arch = "wasm32",
+        target_arch = "wasm64",
         target_arch = "asmjs",
         windows
     ))]
@@ -195,6 +198,7 @@ pub struct VaList<'a, 'f: 'a> {
         any(target_arch = "aarch64", target_arch = "powerpc", target_arch = "x86_64"),
         any(not(target_arch = "aarch64"), not(any(target_os = "macos", target_os = "ios"))),
         not(target_arch = "wasm32"),
+        not(target_arch = "wasm64"),
         not(target_arch = "asmjs"),
         not(windows)
     ))]
@@ -207,6 +211,7 @@ pub struct VaList<'a, 'f: 'a> {
     all(not(target_arch = "aarch64"), not(target_arch = "powerpc"), not(target_arch = "x86_64")),
     all(target_arch = "aarch64", any(target_os = "macos", target_os = "ios")),
     target_arch = "wasm32",
+    target_arch = "wasm64",
     target_arch = "asmjs",
     windows
 ))]
@@ -228,6 +233,7 @@ impl<'f> VaListImpl<'f> {
     any(target_arch = "aarch64", target_arch = "powerpc", target_arch = "x86_64"),
     any(not(target_arch = "aarch64"), not(any(target_os = "macos", target_os = "ios"))),
     not(target_arch = "wasm32"),
+    not(target_arch = "wasm64"),
     not(target_arch = "asmjs"),
     not(windows)
 ))]

panic_abort/src/lib.rs

@@ -117,7 +117,8 @@ pub unsafe extern "C-unwind" fn __rust_start_panic(_payload: *mut &mut dyn BoxMe
 pub mod personalities {
     #[rustc_std_internal_symbol]
     #[cfg(not(any(
-        all(target_arch = "wasm32", not(target_os = "emscripten"),),
+        all(target_arch = "wasm32", not(target_os = "emscripten")),
+        all(target_arch = "wasm64", not(target_os = "emscripten")),
         all(target_os = "windows", target_env = "gnu", target_arch = "x86_64",),
     )))]
     pub extern "C" fn rust_eh_personality() {}

panic_unwind/src/dummy.rs

@@ -1,6 +1,6 @@
-//! Unwinding for *wasm32* target.
+//! Unwinding for unsupported target.
 //!
-//! Right now we don't support this, so this is just stubs.
+//! Stubs that simply abort for targets that don't support unwinding otherwise.
 
 use alloc::boxed::Box;
 use core::any::Any;

panic_unwind/src/lib.rs

@@ -57,6 +57,7 @@ cfg_if::cfg_if! {
     } else {
         // Targets that don't support unwinding.
         // - arch=wasm32
+        // - arch=wasm64
         // - os=none ("bare metal" targets)
         // - os=uefi
         // - os=espidf

std/Cargo.toml

@@ -35,7 +35,7 @@ features = ['read_core', 'elf', 'macho', 'pe', 'unaligned', 'archive']
 [dev-dependencies]
 rand = "0.7"
 
-[target.'cfg(any(all(target_arch = "wasm32", not(target_os = "emscripten")), all(target_vendor = "fortanix", target_env = "sgx")))'.dependencies]
+[target.'cfg(any(all(any(target_arch = "wasm32", target_arch = "wasm64"), not(target_os = "emscripten")), all(target_vendor = "fortanix", target_env = "sgx")))'.dependencies]
 dlmalloc = { version = "0.2.1", features = ['rustc-dep-of-std'] }
 
 [target.x86_64-fortanix-unknown-sgx.dependencies]

std/build.rs

@@ -25,6 +25,7 @@ fn main() {
         || target.contains("haiku")
         || target.contains("vxworks")
         || target.contains("wasm32")
+        || target.contains("wasm64")
         || target.contains("asmjs")
         || target.contains("espidf")
         || target.contains("solid")

std/src/sys/common/alloc.rs

@@ -24,7 +24,8 @@ pub const MIN_ALIGN: usize = 8;
     target_arch = "mips64",
     target_arch = "s390x",
     target_arch = "sparc64",
-    target_arch = "riscv64"
+    target_arch = "riscv64",
+    target_arch = "wasm64",
 )))]
 pub const MIN_ALIGN: usize = 16;
 

std/src/sys/mod.rs

@@ -40,7 +40,7 @@ cfg_if::cfg_if! {
     } else if #[cfg(target_os = "wasi")] {
         mod wasi;
         pub use self::wasi::*;
-    } else if #[cfg(target_arch = "wasm32")] {
+    } else if #[cfg(any(target_arch = "wasm32", target_arch = "wasm64"))] {
         mod wasm;
         pub use self::wasm::*;
     } else if #[cfg(all(target_vendor = "fortanix", target_env = "sgx"))] {

std/src/sys/wasm/alloc.rs

@@ -1,8 +1,8 @@
-//! This is an implementation of a global allocator on the wasm32 platform when
+//! This is an implementation of a global allocator on the wasm platform when
 //! emscripten is not in use. In that situation there's no actual runtime for us
 //! to lean on for allocation, so instead we provide our own!
 //!
-//! The wasm32 instruction set has two instructions for getting the current
+//! The wasm instruction set has two instructions for getting the current
 //! amount of memory and growing the amount of memory. These instructions are the
 //! foundation on which we're able to build an allocator, so we do so! Note that
 //! the instructions are also pretty "global" and this is the "global" allocator

std/src/sys_common/mod.rs

@@ -41,6 +41,7 @@ cfg_if::cfg_if! {
                  target_os = "hermit",
                  feature = "restricted-std",
                  all(target_arch = "wasm32", not(target_os = "emscripten")),
+                 all(target_arch = "wasm64", not(target_os = "emscripten")),
                  all(target_vendor = "fortanix", target_env = "sgx")))] {
         pub use crate::sys::net;
     } else {