Macro ext_php_rs::zend_fastcall

zend_fastcall!() { /* proc-macro */ }

Defines an extern function with the Zend fastcall convention based on operating system.

On Windows, Zend fastcall functions use the vector calling convention, while on all other operating systems no fastcall convention is used (just the regular C calling convention).

This macro wraps a function and applies the correct calling convention.

Examples

use ext_php_rs::zend_fastcall;

zend_fastcall! {
    pub extern fn test_hello_world(a: i32, b: i32) -> i32 {
        a + b
    }
}

On Windows, this function will have the signature pub extern "vectorcall" fn(i32, i32) -> i32, while on macOS/Linux the function will have the signature pub extern "C" fn(i32, i32) -> i32.

Support

The vectorcall ABI is currently only supported on Windows with nightly Rust and the abi_vectorcall feature enabled.