60 lines
1.6 KiB
Rust
60 lines
1.6 KiB
Rust
// run-pass
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// aux-build:helper.rs
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// no-prefer-dynamic
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#![feature(allocator_api)]
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#![feature(slice_ptr_get)]
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extern crate helper;
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use std::alloc::{self, Allocator, Global, Layout, System};
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use std::sync::atomic::{AtomicUsize, Ordering};
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static HITS: AtomicUsize = AtomicUsize::new(0);
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struct A;
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unsafe impl alloc::GlobalAlloc for A {
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unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
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HITS.fetch_add(1, Ordering::SeqCst);
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alloc::GlobalAlloc::alloc(&System, layout)
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}
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unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
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HITS.fetch_add(1, Ordering::SeqCst);
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alloc::GlobalAlloc::dealloc(&System, 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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println!("hello!");
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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 memory = Global.allocate(layout.clone()).unwrap();
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helper::work_with(&memory);
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assert_eq!(HITS.load(Ordering::SeqCst), n + 1);
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Global.deallocate(memory.as_non_null_ptr(), layout);
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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 memory = System.allocate(layout.clone()).unwrap();
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helper::work_with(&memory);
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assert_eq!(HITS.load(Ordering::SeqCst), n + 4);
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System.deallocate(memory.as_non_null_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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