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体验新版 GitCode,发现更多精彩内容 >>
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9065c7ce
编写于
1月 26, 2022
作者:
N
Nicholas Nethercote
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0c17893d
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1 changed file
with
21 addition
and
7 deletion
+21
-7
compiler/rustc_arena/src/lib.rs
compiler/rustc_arena/src/lib.rs
+21
-7
未找到文件。
compiler/rustc_arena/src/lib.rs
浏览文件 @
9065c7ce
...
...
@@ -125,6 +125,11 @@ impl<I, T> IterExt<T> for I
where
I
:
IntoIterator
<
Item
=
T
>
,
{
// This default collects into a `SmallVec` and then allocates by copying
// from it. The specializations below for types like `Vec` are more
// efficient, copying directly without the intermediate collecting step.
// This default could be made more efficient, like
// `DroplessArena::alloc_from_iter`, but it's not hot enough to bother.
#[inline]
default
fn
alloc_from_iter
(
self
,
arena
:
&
TypedArena
<
T
>
)
->
&
mut
[
T
]
{
let
vec
:
SmallVec
<
[
_
;
8
]
>
=
self
.into_iter
()
.collect
();
...
...
@@ -139,7 +144,7 @@ fn alloc_from_iter(self, arena: &TypedArena<T>) -> &mut [T] {
if
len
==
0
{
return
&
mut
[];
}
// Move the content to the arena by copying and then forgetting it
// Move the content to the arena by copying and then forgetting it
.
unsafe
{
let
start_ptr
=
arena
.alloc_raw_slice
(
len
);
self
.as_slice
()
.as_ptr
()
.copy_to_nonoverlapping
(
start_ptr
,
len
);
...
...
@@ -156,7 +161,7 @@ fn alloc_from_iter(mut self, arena: &TypedArena<T>) -> &mut [T] {
if
len
==
0
{
return
&
mut
[];
}
// Move the content to the arena by copying and then forgetting it
// Move the content to the arena by copying and then forgetting it
.
unsafe
{
let
start_ptr
=
arena
.alloc_raw_slice
(
len
);
self
.as_ptr
()
.copy_to_nonoverlapping
(
start_ptr
,
len
);
...
...
@@ -173,7 +178,7 @@ fn alloc_from_iter(mut self, arena: &TypedArena<A::Item>) -> &mut [A::Item] {
if
len
==
0
{
return
&
mut
[];
}
// Move the content to the arena by copying and then forgetting it
// Move the content to the arena by copying and then forgetting it
.
unsafe
{
let
start_ptr
=
arena
.alloc_raw_slice
(
len
);
self
.as_ptr
()
.copy_to_nonoverlapping
(
start_ptr
,
len
);
...
...
@@ -520,10 +525,19 @@ pub fn alloc_from_iter<T, I: IntoIterator<Item = T>>(&self, iter: I) -> &mut [T]
}
}
// Declare an `Arena` containing one dropless arena and many typed arenas (the
// types of the typed arenas are specified by the arguments). The dropless
// arena will be used for any types that impl `Copy`, and also for any of the
// specified types that satisfy `!mem::needs_drop`.
/// Declare an `Arena` containing one dropless arena and many typed arenas (the
/// types of the typed arenas are specified by the arguments).
///
/// There are three cases of interest.
/// - Types that are `Copy`: these need not be specified in the arguments. They
/// will use the `DroplessArena`.
/// - Types that are `!Copy` and `!Drop`: these must be specified in the
/// arguments. An empty `TypedArena` will be created for each one, but the
/// `DroplessArena` will always be used and the `TypedArena` will stay empty.
/// This is odd but harmless, because an empty arena allocates no memory.
/// - Types that are `!Copy` and `Drop`: these must be specified in the
/// arguments. The `TypedArena` will be used for them.
///
#[rustc_macro_transparency
=
"semitransparent"
]
pub
macro
declare_arena
([
$
(
$
a
:
tt
$
name
:
ident
:
$
ty
:
ty
,)
*
])
{
#[derive(Default)]
...
...
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