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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)
}
}
}
}
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