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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.
// aux-build:helper.rs
// no-prefer-dynamic
#![feature(global_allocator, heap_api, allocator_api)]
extern crate helper;
use std::alloc::{self, Global, Alloc, System, Layout, Opaque};
use std::sync::atomic::{AtomicUsize, Ordering, ATOMIC_USIZE_INIT};
static HITS: AtomicUsize = ATOMIC_USIZE_INIT;
struct A;
unsafe impl alloc::GlobalAlloc for A {
unsafe fn alloc(&self, layout: Layout) -> *mut Opaque {
HITS.fetch_add(1, Ordering::SeqCst);
System.alloc(layout)
}
unsafe fn dealloc(&self, ptr: *mut Opaque, 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 = Global.alloc(layout.clone()).unwrap();
helper::work_with(&ptr);
assert_eq!(HITS.load(Ordering::SeqCst), n + 1);
Global.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);
}
}
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