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allow getting the function pointer / lazy import struct

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2025-05-15 15:22:16 +02:00
parent c0c0373059
commit 152853ed2c
1 changed files with 22 additions and 12 deletions
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34
src/lazy_importer.rs
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@@ -21,29 +21,39 @@ pub use make_seed;
#[macro_export] #[macro_export]
macro_rules! link { macro_rules! link {
($library:literal $abi:literal $($link_name:literal)? fn $fname:ident ($($name:ident : $arg:ty),*)) => ( ($library:literal $abi:literal $($link_name:literal)? fn $fname:ident ($($name:ident : $arg:ty),*)) => (
#[allow(non_snake_case)]
pub mod $fname {
pub const SEED: u64 = $crate::lazy_importer::make_seed!();
pub static IMPORT: $crate::lazy_importer::LazyImport<
{ $crate::lazy_importer::hash_utf8::<SEED>($library.as_bytes()) },
{ $crate::lazy_importer::hash_utf8::<SEED>(stringify!($fname).as_bytes()) },
SEED, ()
> = $crate::lazy_importer::LazyImport::new();
}
#[inline(always)] #[inline(always)]
#[allow(non_snake_case)] #[allow(non_snake_case)]
pub fn $fname ($($name: $arg),*) { pub fn $fname ($($name: $arg),*) {
const SEED: u64 = $crate::lazy_importer::make_seed!(); unsafe { core::mem::transmute::<_,extern $abi fn($($arg),*)>($fname::IMPORT.resolve())($($name),*) }
static LI: $crate::lazy_importer::LazyImport<
{ $crate::lazy_importer::hash_utf8::<SEED>($library.as_bytes()) },
{ $crate::lazy_importer::hash_utf8::<SEED>(stringify!($fname).as_bytes()) },
SEED, ()
> = $crate::lazy_importer::LazyImport::new();
unsafe { core::mem::transmute::<_,extern $abi fn($($arg),*)>(LI.resolve())($($name),*) }
} }
); );
($library:literal $abi:literal $($link_name:literal)? fn $fname:ident ($($name:ident : $arg:ty),*) -> $ret:ty) => ( ($library:literal $abi:literal $($link_name:literal)? fn $fname:ident ($($name:ident : $arg:ty),*) -> $ret:ty) => (
#[inline(always)]
#[allow(non_snake_case)] #[allow(non_snake_case)]
pub fn $fname ($($name: $arg),*) -> $ret { pub mod $fname {
const SEED: u64 = $crate::lazy_importer::make_seed!(); pub const SEED: u64 = $crate::lazy_importer::make_seed!();
static LI: $crate::lazy_importer::LazyImport< pub static IMPORT: $crate::lazy_importer::LazyImport<
{ $crate::lazy_importer::hash_utf8::<SEED>($library.as_bytes()) }, { $crate::lazy_importer::hash_utf8::<SEED>($library.as_bytes()) },
{ $crate::lazy_importer::hash_utf8::<SEED>(stringify!($fname).as_bytes()) }, { $crate::lazy_importer::hash_utf8::<SEED>(stringify!($fname).as_bytes()) },
SEED, () SEED, ()
> = $crate::lazy_importer::LazyImport::new(); > = $crate::lazy_importer::LazyImport::new();
unsafe { core::mem::transmute::<_,extern $abi fn($($arg),*) -> $ret>(LI.resolve())($($name),*) } }
#[inline(always)]
#[allow(non_snake_case)]
pub fn $fname ($($name: $arg),*) -> $ret {
unsafe { core::mem::transmute::<_,extern $abi fn($($arg),*) -> $ret>($fname::IMPORT.resolve())($($name),*) }
} }
) )
} }