69 lines
2.0 KiB
Rust
69 lines
2.0 KiB
Rust
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// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// aux-build:helper.rs
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// no-prefer-dynamic
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#![feature(global_allocator, heap_api, allocator_api)]
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extern crate helper;
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use std::env;
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use std::heap::{Heap, Alloc, System, Layout, AllocErr};
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use std::sync::atomic::{AtomicUsize, Ordering, ATOMIC_USIZE_INIT};
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static HITS: AtomicUsize = ATOMIC_USIZE_INIT;
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struct A;
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unsafe impl<'a> Alloc for &'a A {
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unsafe fn alloc(&mut self, layout: Layout) -> Result<*mut u8, AllocErr> {
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HITS.fetch_add(1, Ordering::SeqCst);
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System.alloc(layout)
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}
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unsafe fn dealloc(&mut self, ptr: *mut u8, layout: Layout) {
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HITS.fetch_add(1, Ordering::SeqCst);
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System.dealloc(ptr, layout)
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}
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}
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#[global_allocator]
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static GLOBAL: A = A;
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fn main() {
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env::set_var("FOO", "bar");
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drop(env::var("FOO"));
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let n = HITS.load(Ordering::SeqCst);
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assert!(n > 0);
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unsafe {
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let layout = Layout::from_size_align(4, 2).unwrap();
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let ptr = Heap.alloc(layout.clone()).unwrap();
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helper::work_with(&ptr);
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assert_eq!(HITS.load(Ordering::SeqCst), n + 1);
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Heap.dealloc(ptr, layout.clone());
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assert_eq!(HITS.load(Ordering::SeqCst), n + 2);
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let s = String::with_capacity(10);
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helper::work_with(&s);
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assert_eq!(HITS.load(Ordering::SeqCst), n + 3);
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drop(s);
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assert_eq!(HITS.load(Ordering::SeqCst), n + 4);
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let ptr = System.alloc(layout.clone()).unwrap();
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assert_eq!(HITS.load(Ordering::SeqCst), n + 4);
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helper::work_with(&ptr);
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System.dealloc(ptr, layout);
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assert_eq!(HITS.load(Ordering::SeqCst), n + 4);
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}
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}
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