2 alloc::{GlobalAlloc, Layout, System},
3 sys::common::alloc::{realloc_fallback, MIN_ALIGN},
6 #[stable(feature = "alloc_system_type", since = "1.28.0")]
7 unsafe impl GlobalAlloc for System {
9 unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
10 if layout.align() <= MIN_ALIGN && layout.align() <= layout.size() {
11 unsafe { libc::malloc(layout.size()) as *mut u8 }
13 unsafe { libc::memalign(layout.align(), layout.size()) as *mut u8 }
18 unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {
19 unsafe { libc::free(ptr as *mut libc::c_void) }
23 unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
25 if layout.align() <= MIN_ALIGN && layout.align() <= new_size {
26 libc::realloc(ptr as *mut libc::c_void, new_size) as *mut u8
28 realloc_fallback(self, ptr, layout, new_size)