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    // Copyright 2017 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    //! dox

    #![unstable(issue = "32838", feature = "allocator_api")]

    pub use alloc::heap::{Heap, Alloc, Layout, Excess, CannotReallocInPlace, AllocErr};
    pub use alloc_system::System;

    #[cfg(not(test))]
    #[doc(hidden)]
    #[allow(unused_attributes)]
    pub mod __default_lib_allocator {
        use super::{System, Layout, Alloc, AllocErr};
        use ptr;

        // for symbol names src/librustc/middle/allocator.rs
        // for signatures src/librustc_allocator/lib.rs

        // linkage directives are provided as part of the current compiler allocator
        // ABI

        #[no_mangle]
        #[rustc_std_internal_symbol]
        pub unsafe extern fn __rdl_alloc(size: usize,
                                         align: usize,
                                         err: *mut u8) -> *mut u8 {
            let layout = Layout::from_size_align_unchecked(size, align);
            match System.alloc(layout) {
                Ok(p) => p,
                Err(e) => {
                    ptr::write(err as *mut AllocErr, e);
                    0 as *mut u8
                }
            }
        }

        #[no_mangle]
        #[rustc_std_internal_symbol]
        pub unsafe extern fn __rdl_oom(err: *const u8) -> ! {
            System.oom((*(err as *const AllocErr)).clone())
        }

        #[no_mangle]
        #[rustc_std_internal_symbol]
        pub unsafe extern fn __rdl_dealloc(ptr: *mut u8,
                                           size: usize,
                                           align: usize) {
            System.dealloc(ptr, Layout::from_size_align_unchecked(size, align))
        }

        #[no_mangle]
        #[rustc_std_internal_symbol]
        pub unsafe extern fn __rdl_usable_size(layout: *const u8,
                                               min: *mut usize,
                                               max: *mut usize) {
            let pair = System.usable_size(&*(layout as *const Layout));
            *min = pair.0;
            *max = pair.1;
        }

        #[no_mangle]
        #[rustc_std_internal_symbol]
        pub unsafe extern fn __rdl_realloc(ptr: *mut u8,
                                           old_size: usize,
                                           old_align: usize,
                                           new_size: usize,
                                           new_align: usize,
                                           err: *mut u8) -> *mut u8 {
            let old_layout = Layout::from_size_align_unchecked(old_size, old_align);
            let new_layout = Layout::from_size_align_unchecked(new_size, new_align);
            match System.realloc(ptr, old_layout, new_layout) {
                Ok(p) => p,
                Err(e) => {
                    ptr::write(err as *mut AllocErr, e);
                    0 as *mut u8
                }
            }
        }

        #[no_mangle]
        #[rustc_std_internal_symbol]
        pub unsafe extern fn __rdl_alloc_zeroed(size: usize,
                                                align: usize,
                                                err: *mut u8) -> *mut u8 {
            let layout = Layout::from_size_align_unchecked(size, align);
            match System.alloc_zeroed(layout) {
                Ok(p) => p,
                Err(e) => {
                    ptr::write(err as *mut AllocErr, e);
                    0 as *mut u8
                }
            }
        }

        #[no_mangle]
        #[rustc_std_internal_symbol]
        pub unsafe extern fn __rdl_alloc_excess(size: usize,
                                                align: usize,
                                                excess: *mut usize,
                                                err: *mut u8) -> *mut u8 {
            let layout = Layout::from_size_align_unchecked(size, align);
            match System.alloc_excess(layout) {
                Ok(p) => {
                    *excess = p.1;
                    p.0
                }
                Err(e) => {
                    ptr::write(err as *mut AllocErr, e);
                    0 as *mut u8
                }
            }
        }

        #[no_mangle]
        #[rustc_std_internal_symbol]
        pub unsafe extern fn __rdl_realloc_excess(ptr: *mut u8,
                                                  old_size: usize,
                                                  old_align: usize,
                                                  new_size: usize,
                                                  new_align: usize,
                                                  excess: *mut usize,
                                                  err: *mut u8) -> *mut u8 {
            let old_layout = Layout::from_size_align_unchecked(old_size, old_align);
            let new_layout = Layout::from_size_align_unchecked(new_size, new_align);
            match System.realloc_excess(ptr, old_layout, new_layout) {
                Ok(p) => {
                    *excess = p.1;
                    p.0
                }
                Err(e) => {
                    ptr::write(err as *mut AllocErr, e);
                    0 as *mut u8
                }
            }
        }

        #[no_mangle]
        #[rustc_std_internal_symbol]
        pub unsafe extern fn __rdl_grow_in_place(ptr: *mut u8,
                                                 old_size: usize,
                                                 old_align: usize,
                                                 new_size: usize,
                                                 new_align: usize) -> u8 {
            let old_layout = Layout::from_size_align_unchecked(old_size, old_align);
            let new_layout = Layout::from_size_align_unchecked(new_size, new_align);
            match System.grow_in_place(ptr, old_layout, new_layout) {
                Ok(()) => 1,
                Err(_) => 0,
            }
        }

        #[no_mangle]
        #[rustc_std_internal_symbol]
        pub unsafe extern fn __rdl_shrink_in_place(ptr: *mut u8,
                                                   old_size: usize,
                                                   old_align: usize,
                                                   new_size: usize,
                                                   new_align: usize) -> u8 {
            let old_layout = Layout::from_size_align_unchecked(old_size, old_align);
            let new_layout = Layout::from_size_align_unchecked(new_size, new_align);
            match System.shrink_in_place(ptr, old_layout, new_layout) {
                Ok(()) => 1,
                Err(_) => 0,
            }
        }
    }

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