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impl GlobalAlloc for Global

This commit is contained in:
Simon Sapin 2018-04-04 19:15:22 +02:00
parent eae0d46893
commit fd242ee64c
1 changed files with 52 additions and 37 deletions
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91
src/liballoc/alloc.rs
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@ -73,24 +73,60 @@ pub type Heap = Global;
#[allow(non_upper_case_globals)]
pub const Heap: Global = Global;
unsafe impl Alloc for Global {
unsafe impl GlobalAlloc for Global {
#[inline]
unsafe fn alloc(&mut self, layout: Layout) -> Result<*mut u8, AllocErr> {
unsafe fn alloc(&self, layout: Layout) -> *mut Void {
#[cfg(not(stage0))]
let ptr = __rust_alloc(layout.size(), layout.align());
#[cfg(stage0)]
let ptr = __rust_alloc(layout.size(), layout.align(), &mut 0);
if !ptr.is_null() {
Ok(ptr)
} else {
Err(AllocErr)
ptr as *mut Void
}
#[inline]
unsafe fn dealloc(&self, ptr: *mut Void, layout: Layout) {
__rust_dealloc(ptr as *mut u8, layout.size(), layout.align())
}
#[inline]
unsafe fn realloc(&self, ptr: *mut Void, layout: Layout, new_size: usize) -> *mut Void {
#[cfg(not(stage0))]
let ptr = __rust_realloc(ptr as *mut u8, layout.size(), layout.align(), new_size);
#[cfg(stage0)]
let ptr = __rust_realloc(ptr as *mut u8, layout.size(), layout.align(),
new_size, layout.align(), &mut 0);
ptr as *mut Void
}
#[inline]
unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut Void {
#[cfg(not(stage0))]
let ptr = __rust_alloc_zeroed(layout.size(), layout.align());
#[cfg(stage0)]
let ptr = __rust_alloc_zeroed(layout.size(), layout.align(), &mut 0);
ptr as *mut Void
}
#[inline]
fn oom(&self) -> ! {
unsafe {
#[cfg(not(stage0))]
__rust_oom();
#[cfg(stage0)]
__rust_oom(&mut 0);
}
}
}
unsafe impl Alloc for Global {
#[inline]
unsafe fn alloc(&mut self, layout: Layout) -> Result<*mut u8, AllocErr> {
GlobalAlloc::alloc(self, layout).into()
}
#[inline]
unsafe fn dealloc(&mut self, ptr: *mut u8, layout: Layout) {
__rust_dealloc(ptr, layout.size(), layout.align())
GlobalAlloc::dealloc(self, ptr as *mut Void, layout)
}
#[inline]
@ -100,41 +136,17 @@ unsafe impl Alloc for Global {
new_size: usize)
-> Result<*mut u8, AllocErr>
{
#[cfg(not(stage0))]
let ptr = __rust_realloc(ptr, layout.size(), layout.align(), new_size);
#[cfg(stage0)]
let ptr = __rust_realloc(ptr, layout.size(), layout.align(),
new_size, layout.align(), &mut 0);
if !ptr.is_null() {
Ok(ptr)
} else {
Err(AllocErr)
}
GlobalAlloc::realloc(self, ptr as *mut Void, layout, new_size).into()
}
#[inline]
unsafe fn alloc_zeroed(&mut self, layout: Layout) -> Result<*mut u8, AllocErr> {
#[cfg(not(stage0))]
let ptr = __rust_alloc_zeroed(layout.size(), layout.align());
#[cfg(stage0)]
let ptr = __rust_alloc_zeroed(layout.size(), layout.align(), &mut 0);
if !ptr.is_null() {
Ok(ptr)
} else {
Err(AllocErr)
}
GlobalAlloc::alloc_zeroed(self, layout).into()
}
#[inline]
fn oom(&mut self) -> ! {
unsafe {
#[cfg(not(stage0))]
__rust_oom();
#[cfg(stage0)]
__rust_oom(&mut 0);
}
GlobalAlloc::oom(self)
}
}
@ -148,9 +160,12 @@ unsafe fn exchange_malloc(size: usize, align: usize) -> *mut u8 {
align as *mut u8
} else {
let layout = Layout::from_size_align_unchecked(size, align);
Global.alloc(layout).unwrap_or_else(|_| {
let ptr = Global.alloc(layout);
if !ptr.is_null() {
ptr as *mut u8
} else {
Global.oom()
})
}
}
}
@ -162,7 +177,7 @@ pub(crate) unsafe fn box_free<T: ?Sized>(ptr: *mut T) {
// We do not allocate for Box<T> when T is ZST, so deallocation is also not necessary.
if size != 0 {
let layout = Layout::from_size_align_unchecked(size, align);
Global.dealloc(ptr as *mut u8, layout);
Global.dealloc(ptr as *mut Void, layout);
}
}