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#![no_std]
#![feature(allocator_api)]
extern crate sgx_trts;
use core::alloc::{GlobalAlloc, Alloc, AllocErr, Layout, };
use core::ptr::NonNull;
#[cfg(target_arch = "x86")]
const MIN_ALIGN: usize = 8;
#[cfg(target_arch = "x86_64")]
const MIN_ALIGN: usize = 16;
pub struct System;
unsafe impl Alloc for System {
#[inline]
unsafe fn alloc(&mut self, layout: Layout) -> Result<NonNull<u8>, AllocErr> {
NonNull::new(GlobalAlloc::alloc(self, layout)).ok_or(AllocErr)
}
#[inline]
unsafe fn alloc_zeroed(&mut self, layout: Layout)
-> Result<NonNull<u8>, AllocErr>
{
NonNull::new(GlobalAlloc::alloc_zeroed(self, layout)).ok_or(AllocErr)
}
#[inline]
unsafe fn dealloc(&mut self, ptr: core::ptr::NonNull<u8>, layout: Layout) {
GlobalAlloc::dealloc(self, ptr.as_ptr(), layout)
}
#[inline]
unsafe fn realloc(&mut self,
ptr: core::ptr::NonNull<u8>,
layout: Layout,
new_size: usize) -> Result<NonNull<u8>, AllocErr> {
NonNull::new(GlobalAlloc::realloc(self, ptr.as_ptr(), layout, new_size)).ok_or(AllocErr)
}
}
mod realloc_fallback {
use core::alloc::{GlobalAlloc, Layout};
use core::cmp;
use core::ptr;
impl super::System {
pub(crate) unsafe fn realloc_fallback(&self, ptr: *mut u8, old_layout: Layout,
new_size: usize) -> *mut u8 {
let new_layout = Layout::from_size_align_unchecked(new_size, old_layout.align());
let new_ptr = GlobalAlloc::alloc(self, new_layout);
if !new_ptr.is_null() {
let size = cmp::min(old_layout.size(), new_size);
ptr::copy_nonoverlapping(ptr, new_ptr, size);
GlobalAlloc::dealloc(self, ptr, old_layout);
}
new_ptr
}
}
}
mod platform {
use sgx_trts::libc::{self, c_void};
use core::ptr;
use MIN_ALIGN;
use System;
use core::alloc::{GlobalAlloc, Layout};
unsafe impl GlobalAlloc for System {
#[inline]
unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
let ptr = if layout.align() <= MIN_ALIGN && layout.align() <= layout.size() {
libc::malloc(layout.size()) as *mut u8
} else {
aligned_malloc(&layout)
};
ptr
}
#[inline]
unsafe fn alloc_zeroed(&self, layout: Layout)
-> *mut u8
{
if layout.align() <= MIN_ALIGN && layout.align() <= layout.size() {
libc::calloc(layout.size(), 1) as *mut u8
} else {
let ptr = self.alloc(layout.clone());
if !ptr.is_null() {
ptr::write_bytes(ptr, 0, layout.size());
}
ptr
}
}
#[inline]
unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {
libc::free(ptr as *mut c_void)
}
#[inline]
unsafe fn realloc(&self,
ptr: *mut u8,
layout: Layout,
new_size: usize) -> *mut u8 {
if layout.align() <= MIN_ALIGN && layout.align() <= new_size {
libc::realloc(ptr as *mut libc::c_void, new_size) as *mut u8
} else {
self.realloc_fallback(ptr, layout, new_size)
}
}
}
#[inline]
unsafe fn aligned_malloc(layout: &Layout) -> *mut u8 {
let mut out = ptr::null_mut();
let ret = libc::posix_memalign(&mut out, layout.align(), layout.size());
if ret != 0 {
ptr::null_mut()
} else {
out as *mut u8
}
}
}