1 use crate::alloc::{GlobalAlloc, Layout, System};
3 use crate::sys_common::alloc::{MIN_ALIGN, realloc_fallback};
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 libc::malloc(layout.size()) as *mut u8
13 libc::aligned_alloc(layout.size(), layout.align()) as *mut u8
18 unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
19 if layout.align() <= MIN_ALIGN && layout.align() <= layout.size() {
20 libc::calloc(layout.size(), 1) as *mut u8
22 let ptr = self.alloc(layout.clone());
24 ptr::write_bytes(ptr, 0, layout.size());
31 unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {
32 libc::free(ptr as *mut libc::c_void)
36 unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
37 if layout.align() <= MIN_ALIGN && layout.align() <= new_size {
38 libc::realloc(ptr as *mut libc::c_void, new_size) as *mut u8
40 realloc_fallback(self, ptr, layout, new_size)