| use crate::{ |
| alloc::{GlobalAlloc, Layout, System}, |
| sys::common::alloc::{realloc_fallback, MIN_ALIGN}, |
| }; |
| |
| #[stable(feature = "alloc_system_type", since = "1.28.0")] |
| unsafe impl GlobalAlloc for System { |
| #[inline] |
| unsafe fn alloc(&self, layout: Layout) -> *mut u8 { |
| if layout.align() <= MIN_ALIGN && layout.align() <= layout.size() { |
| unsafe { libc::malloc(layout.size()) as *mut u8 } |
| } else { |
| unsafe { libc::memalign(layout.align(), layout.size()) as *mut u8 } |
| } |
| } |
| |
| #[inline] |
| unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) { |
| unsafe { libc::free(ptr as *mut libc::c_void) } |
| } |
| |
| #[inline] |
| unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 { |
| unsafe { |
| if layout.align() <= MIN_ALIGN && layout.align() <= new_size { |
| libc::realloc(ptr as *mut libc::c_void, new_size) as *mut u8 |
| } else { |
| realloc_fallback(self, ptr, layout, new_size) |
| } |
| } |
| } |
| } |