| // 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.. |
| |
| pub use core::clone::Clone; |
| pub use core::marker::Copy; |
| pub use core::default::Default; |
| pub use core::ptr; |
| pub use core::mem::transmute; |
| pub use core::mem::size_of; |
| pub use crate::marker::ContiguousMemory; |
| |
| #[macro_export] |
| 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] $it)* |
| }; |
| } |
| |
| #[macro_export] |
| macro_rules! __item { |
| ($i:item) => ($i) |
| } |
| |
| macro_rules! impl_copy_clone{ |
| ($($(#[$attr:meta])* pub struct $i:ident { $($field:tt)* })*) => ($( |
| $crate::__item! { |
| #[repr(C)] |
| $(#[$attr])* |
| pub struct $i { $($field)* } |
| } |
| impl Copy for $i {} |
| impl Clone for $i { |
| fn clone(&self) -> $i { *self } |
| } |
| )*) |
| } |
| |
| #[macro_export] |
| macro_rules! s { |
| ($($(#[$attr:meta])* pub struct $i:ident { $($field:tt)* })*) => ($( |
| $crate::__item! { |
| #[repr(C)] |
| $(#[$attr])* |
| pub struct $i { $($field)* } |
| } |
| impl Copy for $i {} |
| impl Clone for $i { |
| fn clone(&self) -> $i { *self } |
| } |
| )*) |
| } |
| |
| #[macro_export] |
| macro_rules! impl_struct { |
| ($($(#[$attr:meta])* pub struct $i:ident { $(pub $name:ident: $field:ty,)* })*) => ($( |
| $crate::__item! { |
| #[repr(C)] |
| $(#[$attr])* |
| pub struct $i { $(pub $name: $field,)* } |
| } |
| impl Copy for $i {} |
| impl Clone for $i { |
| fn clone(&self) -> $i { *self } |
| } |
| impl Default for $i { |
| fn default()->$i { |
| $i{$($name: Default::default(),)*} |
| } |
| } |
| unsafe impl $crate::marker::ContiguousMemory for $i {} |
| )*) |
| } |
| |
| macro_rules! impl_struct_default { |
| ($($t:ty;)*) => {$( |
| impl Default for $t { |
| fn default() -> $t { |
| unsafe{macros::transmute([0u8; macros::size_of::<$t>()])} |
| } |
| } |
| )*} |
| } |
| |
| macro_rules! impl_struct_clone { |
| ($($t:ty;)*) => {$( |
| impl Clone for $t { |
| fn clone(&self) -> $t { |
| unsafe{macros::ptr::read(self)} |
| } |
| } |
| )*} |
| } |
| |
| macro_rules! impl_struct_ContiguousMemory { |
| ($($t:ty;)*) => {$( |
| unsafe impl ContiguousMemory for $t {} |
| )*} |
| } |
| |
| #[macro_export] |
| macro_rules! impl_enum { |
| ( |
| #[repr($repr:ident)] |
| #[derive($($derive:meta),*)] |
| pub enum $name:ident { |
| $key:ident = $val:expr, |
| $($keys:ident = $vals:expr,)* |
| } |
| ) => ( |
| #[repr($repr)] |
| #[derive($($derive),*)] |
| pub enum $name { |
| $key = $val, |
| $($keys = $vals,)* |
| } |
| |
| impl Default for $name { |
| fn default() -> $name { |
| $name::$key |
| } |
| } |
| |
| impl $name { |
| pub fn from_repr(v: $repr) -> Option<Self> { |
| match v { |
| $val => Some($name::$key), |
| $($vals => Some($name::$keys),)* |
| _ => None, |
| } |
| } |
| |
| pub fn from_key(self) -> $repr { |
| match self { |
| $name::$key => $val, |
| $($name::$keys => $vals,)* |
| } |
| } |
| } |
| ) |
| } |
| |
| #[macro_export] |
| macro_rules! meta_data_make_version { |
| ($major:ident, $minor:ident) => ( ($major as u64) << 32 | $minor as u64 ) |
| } |
| |
| #[macro_export] |
| macro_rules! major_version_of_metadata { |
| ($version:ident) => ( ($version as u64) >> 32 ) |
| } |
| |
| #[macro_export] |
| macro_rules! minor_version_of_metadata { |
| ($version:ident) => ( ($version as u64) & 0x0000_0000_FFFF_FFFF ) |
| } |
| |
| #[macro_export] |
| macro_rules! group_id { |
| ($gid:expr) => ( (GROUP_FLAG | $gid) ) |
| } |
| |
| #[macro_export] |
| macro_rules! is_group_id { |
| ($gid:expr) => ( (($gid & GROUP_FLAG) != 0) ) |
| } |