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Static NIFs #688

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f4f801a
Add staticlib feature to compile without nif_init and add {pkg}_nif_init
filmor Mar 15, 2025
1261d6d
Adjust lib name inference
filmor Mar 15, 2025
81cec43
Fix format and remove custom, unreadable env var
filmor Mar 16, 2025
b4a55d7
Use crate name instead of pkg name
filmor Mar 16, 2025
a9e37f7
Raise an error if the crate name is not set
filmor Mar 16, 2025
efa24d1
Deduce whehter to export nif_init
filmor Apr 26, 2025
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3 changes: 1 addition & 2 deletions 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"]
Expand All @@ -23,7 +22,7 @@ serde = ["dep:serde"]

[dependencies]
inventory = "0.3"
rustler_codegen = { path = "../rustler_codegen", version = "0.36.1"}
rustler_codegen = { path = "../rustler_codegen", version = "0.36.1" }
num-bigint = { version = "0.4", optional = true }
serde = { version = "1", optional = true }

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43 changes: 38 additions & 5 deletions rustler_codegen/src/init.rs
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Original file line number Diff line number Diff line change
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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