| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License.. |
| |
| 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)*) ), |
| $( ( ($($e_met),*) ($($e_it)*) ), )* |
| ( () () ), |
| } |
| }; |
| |
| // Internal and recursive macro to emit all the items |
| // |
| // Collects all the negated cfgs in a list at the beginning and after the |
| // semicolon is all the remaining items |
| (@__items ($($not:meta,)*) ; ) => {}; |
| (@__items ($($not:meta,)*) ; ( ($($m:meta),*) ($($it:item)*) ), |
| $($rest:tt)*) => { |
| // Emit all items within one block, applying an approprate #[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)* } |
| } |
| impl Copy for $i {} |
| impl Clone for $i { |
| fn clone(&self) -> $i { *self } |
| } |
| ); |
| } |
| |
| macro_rules! f { |
| ($(pub fn $i:ident($($arg:ident: $argty:ty),*) -> $ret:ty { |
| $($body:stmt);* |
| })*) => ($( |
| #[inline] |
| pub unsafe extern 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: [], |
| }; |
| )*) |
| } |