d9fdbfd50e
* Use the `sym` operator for inline assembly Avoids extra `#[no_mangle]` functions and undue symbols being exposed from Wasmtime. This is a newly stabilized feature in Rust 1.66.0. I've also added a `rust-version` entry to the `wasmtime` crate to try to head off possible reports in the future about odd error messages or usage of unstable features if the rustc version is too old. * Fix a s390x warning * Add `rust-version` annotation to Wasmtime crate As the other main entrypoint for embedders.
82 lines
2.9 KiB
Rust
82 lines
2.9 KiB
Rust
//! This crate defines a macro named `asm_func!` which is suitable for
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//! generating a single `global_asm!`-defined function.
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//!
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//! This macro takes care of platform-specific directives to get the symbol
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//! attributes correct (e.g. ELF symbols get a size and are flagged as a
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//! function) and additionally handles visibility across platforms. All symbols
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//! should be visible to Rust but not visible externally outside of a `*.so`.
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cfg_if::cfg_if! {
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if #[cfg(target_os = "macos")] {
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#[macro_export]
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macro_rules! asm_func {
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($name:expr, $body:expr $(, $($args:tt)*)?) => {
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std::arch::global_asm!(
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concat!(
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".p2align 4\n",
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".private_extern _", $name, "\n",
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".global _", $name, "\n",
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"_", $name, ":\n",
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$body,
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),
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$($($args)*)?
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);
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};
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}
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} else if #[cfg(target_os = "windows")] {
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#[macro_export]
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macro_rules! asm_func {
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($name:expr, $body:expr $(, $($args:tt)*)?) => {
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std::arch::global_asm!(
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concat!(
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".def ", $name, "\n",
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".scl 2\n",
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".type 32\n",
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".endef\n",
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".global ", $name, "\n",
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".p2align 4\n",
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$name, ":\n",
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$body
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),
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$($($args)*)?
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);
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};
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}
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} else {
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// Note that for now this "else" clause just assumes that everything
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// other than macOS is ELF and has the various directives here for
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// that.
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cfg_if::cfg_if! {
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if #[cfg(target_arch = "arm")] {
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#[macro_export]
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macro_rules! elf_func_type_header {
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($name:tt) => (concat!(".type ", $name, ",%function\n"))
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}
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} else {
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#[macro_export]
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macro_rules! elf_func_type_header {
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($name:tt) => (concat!(".type ", $name, ",@function\n"))
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}
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}
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}
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#[macro_export]
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macro_rules! asm_func {
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($name:expr, $body:expr $(, $($args:tt)*)?) => {
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std::arch::global_asm!(
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concat!(
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".p2align 4\n",
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".hidden ", $name, "\n",
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".global ", $name, "\n",
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$crate::elf_func_type_header!($name),
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$name, ":\n",
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$body,
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".size ", $name, ",.-", $name,
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)
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$(, $($args)*)?
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);
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};
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}
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}
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}
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