| // 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. |
| |
| // aux-build:helper.rs |
| // no-prefer-dynamic |
| |
| #![feature(global_allocator, heap_api, allocator_api)] |
| |
| extern crate helper; |
| |
| use std::heap::{Heap, Alloc, System, Layout, AllocErr}; |
| use std::sync::atomic::{AtomicUsize, Ordering, ATOMIC_USIZE_INIT}; |
| |
| static HITS: AtomicUsize = ATOMIC_USIZE_INIT; |
| |
| struct A; |
| |
| unsafe impl<'a> Alloc for &'a A { |
| unsafe fn alloc(&mut self, layout: Layout) -> Result<*mut u8, AllocErr> { |
| HITS.fetch_add(1, Ordering::SeqCst); |
| System.alloc(layout) |
| } |
| |
| unsafe fn dealloc(&mut self, ptr: *mut u8, layout: Layout) { |
| HITS.fetch_add(1, Ordering::SeqCst); |
| System.dealloc(ptr, layout) |
| } |
| } |
| |
| #[global_allocator] |
| static GLOBAL: A = A; |
| |
| fn main() { |
| println!("hello!"); |
| |
| let n = HITS.load(Ordering::SeqCst); |
| assert!(n > 0); |
| unsafe { |
| let layout = Layout::from_size_align(4, 2).unwrap(); |
| |
| let ptr = Heap.alloc(layout.clone()).unwrap(); |
| helper::work_with(&ptr); |
| assert_eq!(HITS.load(Ordering::SeqCst), n + 1); |
| Heap.dealloc(ptr, layout.clone()); |
| assert_eq!(HITS.load(Ordering::SeqCst), n + 2); |
| |
| let s = String::with_capacity(10); |
| helper::work_with(&s); |
| assert_eq!(HITS.load(Ordering::SeqCst), n + 3); |
| drop(s); |
| assert_eq!(HITS.load(Ordering::SeqCst), n + 4); |
| |
| let ptr = System.alloc(layout.clone()).unwrap(); |
| assert_eq!(HITS.load(Ordering::SeqCst), n + 4); |
| helper::work_with(&ptr); |
| System.dealloc(ptr, layout); |
| assert_eq!(HITS.load(Ordering::SeqCst), n + 4); |
| } |
| } |