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Static NIFs #688

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Merged
merged 1 commit into from
Jul 20, 2025
Merged

Static NIFs #688

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1 change: 0 additions & 1 deletion rustler/Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,6 @@ rust-version = "1.70"
big_integer = ["dep:num-bigint"]
default = ["nif_version_2_15"]
derive = []
alternative_nif_init_name = []
allocator = []
nif_version_2_14 = []
nif_version_2_15 = ["nif_version_2_14"]
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43 changes: 38 additions & 5 deletions rustler_codegen/src/init.rs
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Expand Up @@ -136,25 +136,58 @@ impl From<InitMacroInput> for proc_macro2::TokenStream {
}
};

let nif_init_name = {
let lib_name = std::env::var("CARGO_CRATE_NAME").unwrap();
format!("{lib_name}_nif_init")
};

let nif_init_name = Ident::new(&nif_init_name, Span::call_site());

let should_generate_primary_nif = std::env::var("RUSTLER_PRIMARY_NIF_INIT").is_ok()
|| std::env::var("CARGO_PRIMARY_PACKAGE").is_ok();

let maybe_primary_nif_init = if should_generate_primary_nif {
quote! {
#[cfg(not(windows))]
#[no_mangle]
fn nif_init() -> *const ::rustler::codegen_runtime::DEF_NIF_ENTRY {
#nif_init_name()
}

#[cfg(windows)]
#[no_mangle]
fn nif_init(callbacks: *mut ::rustler::codegen_runtime::DynNifCallbacks) -> *const ::rustler::codegen_runtime::DEF_NIF_ENTRY {
#nif_init_name(callbacks)
}
}
} else {
quote!()
};

quote! {
#maybe_warning

#[cfg(unix)]
#[cfg(not(windows))]
#[no_mangle]
extern "C" fn nif_init() -> *const rustler::codegen_runtime::DEF_NIF_ENTRY {
unsafe { rustler::codegen_runtime::internal_write_symbols() };
extern "C" fn #nif_init_name() -> *const ::rustler::codegen_runtime::DEF_NIF_ENTRY {
unsafe {
::rustler::codegen_runtime::internal_write_symbols()
}

#inner
}

#[cfg(windows)]
#[no_mangle]
extern "C" fn nif_init(callbacks: *mut rustler::codegen_runtime::DynNifCallbacks) -> *const rustler::codegen_runtime::DEF_NIF_ENTRY {
extern "C" fn #nif_init_name(callbacks: *mut ::rustler::codegen_runtime::DynNifCallbacks) -> *const ::rustler::codegen_runtime::DEF_NIF_ENTRY {
unsafe {
rustler::codegen_runtime::internal_set_symbols(*callbacks);
::rustler::codegen_runtime::internal_set_symbols(*callbacks);
}

#inner
}

#maybe_primary_nif_init
}
}
}
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