1 // Copyright 2017 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // aux-build:helper.rs
14 #![feature(global_allocator, heap_api, allocator_api)]
19 use std::heap::{Heap, Alloc, System, Layout, AllocErr};
20 use std::sync::atomic::{AtomicUsize, Ordering, ATOMIC_USIZE_INIT};
22 static HITS: AtomicUsize = ATOMIC_USIZE_INIT;
26 unsafe impl<'a> Alloc for &'a A {
27 unsafe fn alloc(&mut self, layout: Layout) -> Result<*mut u8, AllocErr> {
28 HITS.fetch_add(1, Ordering::SeqCst);
32 unsafe fn dealloc(&mut self, ptr: *mut u8, layout: Layout) {
33 HITS.fetch_add(1, Ordering::SeqCst);
34 System.dealloc(ptr, layout)
42 env::set_var("FOO", "bar");
43 drop(env::var("FOO"));
45 let n = HITS.load(Ordering::SeqCst);
48 let layout = Layout::from_size_align(4, 2).unwrap();
50 let ptr = Heap.alloc(layout.clone()).unwrap();
51 helper::work_with(&ptr);
52 assert_eq!(HITS.load(Ordering::SeqCst), n + 1);
53 Heap.dealloc(ptr, layout.clone());
54 assert_eq!(HITS.load(Ordering::SeqCst), n + 2);
56 let s = String::with_capacity(10);
57 helper::work_with(&s);
58 assert_eq!(HITS.load(Ordering::SeqCst), n + 3);
60 assert_eq!(HITS.load(Ordering::SeqCst), n + 4);
62 let ptr = System.alloc(layout.clone()).unwrap();
63 assert_eq!(HITS.load(Ordering::SeqCst), n + 4);
64 helper::work_with(&ptr);
65 System.dealloc(ptr, layout);
66 assert_eq!(HITS.load(Ordering::SeqCst), n + 4);