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Split global_asm! helper macros out from wasmtime-fibers (#4454)

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This moves them into a new `wasmtime-asm-macros` crate that can be used not just
from the `wasmtime-fibers` crate but also from other crates (e.g. we will need
them in https://github.com/bytecodealliance/wasmtime/pull/4431).
This commit is contained in:
Nick Fitzgerald
2022-07-15 14:10:27 -07:00
committed by GitHub
parent 33312c5380
commit 439f566f3f
10 changed files with 97 additions and 57 deletions
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57
crates/fiber/src/unix.rs
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@@ -177,63 +177,6 @@ impl Suspend {
}
}
// This macro itself generates a macro named `asm_func!` which is suitable for
// generating a single `global_asm!`-defined function. This takes care of
// platform-specific directives to get the symbol attributes correct (e.g. ELF
// symbols get a size and are flagged as a function) and additionally handles
// visibility across platforms. All symbols should be visible to Rust but not
// visible externally outside of a `*.so`.
cfg_if::cfg_if! {
if #[cfg(target_os = "macos")] {
macro_rules! asm_func {
($name:tt, $($body:tt)*) => {
std::arch::global_asm!(concat!(
".p2align 4\n",
".private_extern _", $name, "\n",
".global _", $name, "\n",
"_", $name, ":\n",
$($body)*
));
};
}
macro_rules! asm_sym {
($name:tt) => (concat!("_", $name))
}
} else {
// Note that for now this "else" clause just assumes that everything
// other than macOS is ELF and has the various directives here for
// that.
cfg_if::cfg_if! {
if #[cfg(target_arch = "arm")] {
macro_rules! elf_func_type_header {
($name:tt) => (concat!(".type ", $name, ",%function\n"))
}
} else {
macro_rules! elf_func_type_header {
($name:tt) => (concat!(".type ", $name, ",@function\n"))
}
}
}
macro_rules! asm_func {
($name:tt, $($body:tt)*) => {
std::arch::global_asm!(concat!(
".p2align 4\n",
".hidden ", $name, "\n",
".global ", $name, "\n",
elf_func_type_header!($name),
$name, ":\n",
$($body)*
".size ", $name, ",.-", $name,
));
};
}
macro_rules! asm_sym {
($name:tt) => ($name)
}
}
}
cfg_if::cfg_if! {
if #[cfg(target_arch = "aarch64")] {
mod aarch64;