diff options
Diffstat (limited to 'vendor/libc/src/macros.rs')
| -rw-r--r-- | vendor/libc/src/macros.rs | 349 |
1 files changed, 0 insertions, 349 deletions
diff --git a/vendor/libc/src/macros.rs b/vendor/libc/src/macros.rs deleted file mode 100644 index beb8002..0000000 --- a/vendor/libc/src/macros.rs +++ /dev/null @@ -1,349 +0,0 @@ -/// A macro for defining #[cfg] if-else statements. -/// -/// This is similar to the `if/elif` C preprocessor macro by allowing definition -/// of a cascade of `#[cfg]` cases, emitting the implementation which matches -/// first. -/// -/// This allows you to conveniently provide a long list #[cfg]'d blocks of code -/// without having to rewrite each clause multiple times. -macro_rules! cfg_if { - // match if/else chains with a final `else` - ($( - if #[cfg($($meta:meta),*)] { $($it:item)* } - ) else * else { - $($it2:item)* - }) => { - cfg_if! { - @__items - () ; - $( ( ($($meta),*) ($($it)*) ), )* - ( () ($($it2)*) ), - } - }; - - // match if/else chains lacking a final `else` - ( - if #[cfg($($i_met:meta),*)] { $($i_it:item)* } - $( - else if #[cfg($($e_met:meta),*)] { $($e_it:item)* } - )* - ) => { - cfg_if! { - @__items - () ; - ( ($($i_met),*) ($($i_it)*) ), - $( ( ($($e_met),*) ($($e_it)*) ), )* - ( () () ), - } - }; - - // Internal and recursive macro to emit all the items - // - // Collects all the negated `cfg`s in a list at the beginning and after the - // semicolon is all the remaining items - (@__items ($($not:meta,)*) ; ) => {}; - (@__items ($($not:meta,)*) ; ( ($($m:meta),*) ($($it:item)*) ), - $($rest:tt)*) => { - // Emit all items within one block, applying an appropriate #[cfg]. The - // #[cfg] will require all `$m` matchers specified and must also negate - // all previous matchers. - cfg_if! { @__apply cfg(all($($m,)* not(any($($not),*)))), $($it)* } - - // Recurse to emit all other items in `$rest`, and when we do so add all - // our `$m` matchers to the list of `$not` matchers as future emissions - // will have to negate everything we just matched as well. - cfg_if! { @__items ($($not,)* $($m,)*) ; $($rest)* } - }; - - // Internal macro to Apply a cfg attribute to a list of items - (@__apply $m:meta, $($it:item)*) => { - $(#[$m] $it)* - }; -} - -macro_rules! s { - ($($(#[$attr:meta])* pub $t:ident $i:ident { $($field:tt)* })*) => ($( - s!(it: $(#[$attr])* pub $t $i { $($field)* }); - )*); - (it: $(#[$attr:meta])* pub union $i:ident { $($field:tt)* }) => ( - compile_error!("unions cannot derive extra traits, use s_no_extra_traits instead"); - ); - (it: $(#[$attr:meta])* pub struct $i:ident { $($field:tt)* }) => ( - __item! { - #[repr(C)] - #[cfg_attr(feature = "extra_traits", derive(Debug, Eq, Hash, PartialEq))] - #[allow(deprecated)] - $(#[$attr])* - pub struct $i { $($field)* } - } - #[allow(deprecated)] - impl ::Copy for $i {} - #[allow(deprecated)] - impl ::Clone for $i { - fn clone(&self) -> $i { *self } - } - ); -} - -macro_rules! s_no_extra_traits { - ($($(#[$attr:meta])* pub $t:ident $i:ident { $($field:tt)* })*) => ($( - s_no_extra_traits!(it: $(#[$attr])* pub $t $i { $($field)* }); - )*); - (it: $(#[$attr:meta])* pub union $i:ident { $($field:tt)* }) => ( - cfg_if! { - if #[cfg(libc_union)] { - __item! { - #[repr(C)] - $(#[$attr])* - pub union $i { $($field)* } - } - - impl ::Copy for $i {} - impl ::Clone for $i { - fn clone(&self) -> $i { *self } - } - } - } - ); - (it: $(#[$attr:meta])* pub struct $i:ident { $($field:tt)* }) => ( - __item! { - #[repr(C)] - $(#[$attr])* - pub struct $i { $($field)* } - } - #[allow(deprecated)] - impl ::Copy for $i {} - #[allow(deprecated)] - impl ::Clone for $i { - fn clone(&self) -> $i { *self } - } - ); -} - -macro_rules! missing { - ($($(#[$attr:meta])* pub enum $i:ident {})*) => ($( - $(#[$attr])* #[allow(missing_copy_implementations)] pub enum $i { } - )*); -} - -macro_rules! e { - ($($(#[$attr:meta])* pub enum $i:ident { $($field:tt)* })*) => ($( - __item! { - #[cfg_attr(feature = "extra_traits", derive(Debug, Eq, Hash, PartialEq))] - $(#[$attr])* - pub enum $i { $($field)* } - } - impl ::Copy for $i {} - impl ::Clone for $i { - fn clone(&self) -> $i { *self } - } - )*); -} - -macro_rules! s_paren { - ($($(#[$attr:meta])* pub struct $i:ident ( $($field:tt)* ); )* ) => ($( - __item! { - #[cfg_attr(feature = "extra_traits", derive(Debug, Eq, Hash, PartialEq))] - $(#[$attr])* - pub struct $i ( $($field)* ); - } - impl ::Copy for $i {} - impl ::Clone for $i { - fn clone(&self) -> $i { *self } - } - )*); -} - -// This is a pretty horrible hack to allow us to conditionally mark -// some functions as 'const', without requiring users of this macro -// to care about the "const-extern-fn" feature. -// -// When 'const-extern-fn' is enabled, we emit the captured 'const' keyword -// in the expanded function. -// -// When 'const-extern-fn' is disabled, we always emit a plain 'pub unsafe extern fn'. -// Note that the expression matched by the macro is exactly the same - this allows -// users of this macro to work whether or not 'const-extern-fn' is enabled -// -// Unfortunately, we need to duplicate most of this macro between the 'cfg_if' blocks. -// This is because 'const unsafe extern fn' won't even parse on older compilers, -// so we need to avoid emitting it at all of 'const-extern-fn'. -// -// Specifically, moving the 'cfg_if' into the macro body will *not* work. -// Doing so would cause the '#[cfg(feature = "const-extern-fn")]' to be emitted -// into user code. The 'cfg' gate will not stop Rust from trying to parse the -// 'pub const unsafe extern fn', so users would get a compiler error even when -// the 'const-extern-fn' feature is disabled -// -// Note that users of this macro need to place 'const' in a weird position -// (after the closing ')' for the arguments, but before the return type). -// This was the only way I could satisfy the following two requirements: -// 1. Avoid ambiguity errors from 'macro_rules!' (which happen when writing '$foo:ident fn' -// 2. Allow users of this macro to mix 'pub fn foo' and 'pub const fn bar' within the same -// 'f!' block -cfg_if! { - if #[cfg(libc_const_extern_fn)] { - macro_rules! f { - ($($(#[$attr:meta])* pub $({$constness:ident})* fn $i:ident( - $($arg:ident: $argty:ty),* - ) -> $ret:ty { - $($body:stmt);* - })*) => ($( - #[inline] - $(#[$attr])* - pub $($constness)* unsafe extern fn $i($($arg: $argty),* - ) -> $ret { - $($body);* - } - )*) - } - - macro_rules! safe_f { - ($($(#[$attr:meta])* pub $({$constness:ident})* fn $i:ident( - $($arg:ident: $argty:ty),* - ) -> $ret:ty { - $($body:stmt);* - })*) => ($( - #[inline] - $(#[$attr])* - pub $($constness)* extern fn $i($($arg: $argty),* - ) -> $ret { - $($body);* - } - )*) - } - - macro_rules! const_fn { - ($($(#[$attr:meta])* $({$constness:ident})* fn $i:ident( - $($arg:ident: $argty:ty),* - ) -> $ret:ty { - $($body:stmt);* - })*) => ($( - #[inline] - $(#[$attr])* - $($constness)* fn $i($($arg: $argty),* - ) -> $ret { - $($body);* - } - )*) - } - - } else { - macro_rules! f { - ($($(#[$attr:meta])* pub $({$constness:ident})* fn $i:ident( - $($arg:ident: $argty:ty),* - ) -> $ret:ty { - $($body:stmt);* - })*) => ($( - #[inline] - $(#[$attr])* - pub unsafe extern fn $i($($arg: $argty),* - ) -> $ret { - $($body);* - } - )*) - } - - macro_rules! safe_f { - ($($(#[$attr:meta])* pub $({$constness:ident})* fn $i:ident( - $($arg:ident: $argty:ty),* - ) -> $ret:ty { - $($body:stmt);* - })*) => ($( - #[inline] - $(#[$attr])* - pub extern fn $i($($arg: $argty),* - ) -> $ret { - $($body);* - } - )*) - } - - macro_rules! const_fn { - ($($(#[$attr:meta])* $({$constness:ident})* fn $i:ident( - $($arg:ident: $argty:ty),* - ) -> $ret:ty { - $($body:stmt);* - })*) => ($( - #[inline] - $(#[$attr])* - fn $i($($arg: $argty),* - ) -> $ret { - $($body);* - } - )*) - } - } -} - -macro_rules! __item { - ($i:item) => { - $i - }; -} - -macro_rules! align_const { - ($($(#[$attr:meta])* - pub const $name:ident : $t1:ty - = $t2:ident { $($field:tt)* };)*) => ($( - #[cfg(libc_align)] - $(#[$attr])* - pub const $name : $t1 = $t2 { - $($field)* - }; - #[cfg(not(libc_align))] - $(#[$attr])* - pub const $name : $t1 = $t2 { - $($field)* - __align: [], - }; - )*) -} - -// This macro is used to deprecate items that should be accessed via the mach2 crate -macro_rules! deprecated_mach { - (pub const $id:ident: $ty:ty = $expr:expr;) => { - #[deprecated( - since = "0.2.55", - note = "Use the `mach2` crate instead", - )] - #[allow(deprecated)] - pub const $id: $ty = $expr; - }; - ($(pub const $id:ident: $ty:ty = $expr:expr;)*) => { - $( - deprecated_mach!( - pub const $id: $ty = $expr; - ); - )* - }; - (pub type $id:ident = $ty:ty;) => { - #[deprecated( - since = "0.2.55", - note = "Use the `mach2` crate instead", - )] - #[allow(deprecated)] - pub type $id = $ty; - }; - ($(pub type $id:ident = $ty:ty;)*) => { - $( - deprecated_mach!( - pub type $id = $ty; - ); - )* - } -} - -#[cfg(not(libc_ptr_addr_of))] -macro_rules! ptr_addr_of { - ($place:expr) => { - &$place - }; -} - -#[cfg(libc_ptr_addr_of)] -macro_rules! ptr_addr_of { - ($place:expr) => { - ::core::ptr::addr_of!($place) - }; -} |