93 lines
3.3 KiB
Rust
93 lines
3.3 KiB
Rust
// SPDX-License-Identifier: CC0-1.0
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#![allow(non_camel_case_types)]
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pub type c_int = i32;
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pub type c_uchar = u8;
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pub type c_uint = u32;
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pub type size_t = usize;
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/// This might not match C's `c_char` exactly.
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/// The way we use it makes it fine either way but this type shouldn't be used outside of the library.
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pub type c_char = i8;
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pub use core::ffi::c_void;
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/// A type that is as aligned as the biggest alignment for fundamental types in C
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/// since C11 that means as aligned as `max_align_t` is.
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/// the exact size/alignment is unspecified.
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// 16 matches is as big as the biggest alignment in any arch that rust currently supports https://github.com/rust-lang/rust/blob/2c31b45ae878b821975c4ebd94cc1e49f6073fd0/library/std/src/sys_common/alloc.rs
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#[repr(align(16))]
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#[derive(Default, Copy, Clone)]
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#[allow(dead_code)] // We never access the inner data directly, only by way of a pointer.
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pub struct AlignedType([u8; 16]);
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impl AlignedType {
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pub fn zeroed() -> Self {
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AlignedType([0u8; 16])
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}
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/// A static zeroed out AlignedType for use in static assignments of [AlignedType; _]
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pub const ZERO: AlignedType = AlignedType([0u8; 16]);
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}
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#[cfg(all(feature = "alloc", not(rust_secp_no_symbol_renaming)))]
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pub(crate) const ALIGN_TO: usize = core::mem::align_of::<AlignedType>();
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#[cfg(test)]
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mod tests {
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extern crate libc;
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use std::any::TypeId;
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use std::mem;
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use std::os::raw;
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use crate::{types, AlignedType};
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#[test]
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fn verify_types() {
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assert_eq!(TypeId::of::<types::c_int>(), TypeId::of::<raw::c_int>());
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assert_eq!(TypeId::of::<types::c_uchar>(), TypeId::of::<raw::c_uchar>());
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assert_eq!(TypeId::of::<types::c_uint>(), TypeId::of::<raw::c_uint>());
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assert_eq!(TypeId::of::<types::c_char>(), TypeId::of::<raw::c_char>());
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assert!(mem::align_of::<AlignedType>() >= mem::align_of::<self::libc::max_align_t>());
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}
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}
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#[doc(hidden)]
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#[cfg(target_arch = "wasm32")]
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pub fn sanity_checks_for_wasm() {
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use core::mem::{align_of, size_of};
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extern "C" {
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pub static WASM32_INT_SIZE: c_uchar;
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pub static WASM32_INT_ALIGN: c_uchar;
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pub static WASM32_UNSIGNED_INT_SIZE: c_uchar;
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pub static WASM32_UNSIGNED_INT_ALIGN: c_uchar;
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pub static WASM32_SIZE_T_SIZE: c_uchar;
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pub static WASM32_SIZE_T_ALIGN: c_uchar;
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pub static WASM32_UNSIGNED_CHAR_SIZE: c_uchar;
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pub static WASM32_UNSIGNED_CHAR_ALIGN: c_uchar;
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pub static WASM32_PTR_SIZE: c_uchar;
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pub static WASM32_PTR_ALIGN: c_uchar;
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}
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unsafe {
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assert_eq!(size_of::<c_int>(), WASM32_INT_SIZE as usize);
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assert_eq!(align_of::<c_int>(), WASM32_INT_ALIGN as usize);
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assert_eq!(size_of::<c_uint>(), WASM32_UNSIGNED_INT_SIZE as usize);
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assert_eq!(align_of::<c_uint>(), WASM32_UNSIGNED_INT_ALIGN as usize);
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assert_eq!(size_of::<size_t>(), WASM32_SIZE_T_SIZE as usize);
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assert_eq!(align_of::<size_t>(), WASM32_SIZE_T_ALIGN as usize);
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assert_eq!(size_of::<c_uchar>(), WASM32_UNSIGNED_CHAR_SIZE as usize);
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assert_eq!(align_of::<c_uchar>(), WASM32_UNSIGNED_CHAR_ALIGN as usize);
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assert_eq!(size_of::<*const ()>(), WASM32_PTR_SIZE as usize);
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assert_eq!(align_of::<*const ()>(), WASM32_PTR_ALIGN as usize);
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}
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}
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