mirror of
https://github.com/lune-org/lune.git
synced 2025-04-04 10:30:54 +01:00
43 lines
1.2 KiB
Rust
43 lines
1.2 KiB
Rust
use std::ptr::{self, null_mut};
|
|
|
|
use libffi::{low, raw};
|
|
use mlua::prelude::*;
|
|
|
|
// Get ensured size of c-type (raw::libffi_type)
|
|
// See: http://www.chiark.greenend.org.uk/doc/libffi-dev/html/Size-and-Alignment.html
|
|
pub fn get_ensured_size(ffi_type: *mut raw::ffi_type) -> LuaResult<usize> {
|
|
let mut cif = low::ffi_cif::default();
|
|
let result = unsafe {
|
|
raw::ffi_prep_cif(
|
|
ptr::from_mut(&mut cif),
|
|
raw::ffi_abi_FFI_DEFAULT_ABI,
|
|
0,
|
|
ffi_type,
|
|
null_mut(),
|
|
)
|
|
};
|
|
|
|
ffi_status_assert(result)?;
|
|
unsafe { Ok((*ffi_type).size) }
|
|
}
|
|
|
|
pub const SIZE_OF_POINTER: usize = size_of::<*mut ()>();
|
|
|
|
// Converts ffi status into &str
|
|
pub const FFI_STATUS_NAMES: [&str; 4] = [
|
|
"ffi_status_FFI_OK",
|
|
"ffi_status_FFI_BAD_TYPEDEF",
|
|
"ffi_status_FFI_BAD_ABI",
|
|
"ffi_status_FFI_BAD_ARGTYPE",
|
|
];
|
|
|
|
pub fn ffi_status_assert(result: raw::ffi_status) -> LuaResult<()> {
|
|
if result == raw::ffi_status_FFI_OK {
|
|
Ok(())
|
|
} else {
|
|
Err(LuaError::external(format!(
|
|
"ffi_status assertion failed. expected result {}, got {}",
|
|
FFI_STATUS_NAMES[0], FFI_STATUS_NAMES[result as usize]
|
|
)))
|
|
}
|
|
}
|