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体验新版 GitCode,发现更多精彩内容 >>
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ed96321e
编写于
10月 31, 2020
作者:
R
Ralf Jung
浏览文件
操作
浏览文件
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电子邮件补丁
差异文件
fix aliasing issues in u128 formatting code
上级
3478d7c3
变更
2
隐藏空白更改
内联
并排
Showing
2 changed file
with
11 addition
and
5 deletion
+11
-5
library/core/src/fmt/num.rs
library/core/src/fmt/num.rs
+9
-3
library/core/src/mem/maybe_uninit.rs
library/core/src/mem/maybe_uninit.rs
+2
-2
未找到文件。
library/core/src/fmt/num.rs
浏览文件 @
ed96321e
...
...
@@ -595,7 +595,6 @@ fn fmt_u128(n: u128, is_nonnegative: bool, f: &mut fmt::Formatter<'_>) -> fmt::R
// 2^128 is about 3*10^38, so 39 gives an extra byte of space
let
mut
buf
=
[
MaybeUninit
::
<
u8
>
::
uninit
();
39
];
let
mut
curr
=
buf
.len
()
as
isize
;
let
buf_ptr
=
MaybeUninit
::
slice_as_mut_ptr
(
&
mut
buf
);
let
(
n
,
rem
)
=
udiv_1e19
(
n
);
parse_u64_into
(
rem
,
&
mut
buf
,
&
mut
curr
);
...
...
@@ -606,7 +605,11 @@ fn fmt_u128(n: u128, is_nonnegative: bool, f: &mut fmt::Formatter<'_>) -> fmt::R
// SAFETY: Guaranteed that we wrote at most 19 bytes, and there must be space
// remaining since it has length 39
unsafe
{
ptr
::
write_bytes
(
buf_ptr
.offset
(
target
),
b
'0'
,
(
curr
-
target
)
as
usize
);
ptr
::
write_bytes
(
MaybeUninit
::
slice_as_mut_ptr
(
&
mut
buf
)
.offset
(
target
),
b
'0'
,
(
curr
-
target
)
as
usize
,
);
}
curr
=
target
;
...
...
@@ -615,6 +618,9 @@ fn fmt_u128(n: u128, is_nonnegative: bool, f: &mut fmt::Formatter<'_>) -> fmt::R
// Should this following branch be annotated with unlikely?
if
n
!=
0
{
let
target
=
(
buf
.len
()
-
38
)
as
isize
;
// The raw `buf_ptr` pointer is only valid until `buf` is used the next time,
// buf `buf` is not used in this scope so we are good.
let
buf_ptr
=
MaybeUninit
::
slice_as_mut_ptr
(
&
mut
buf
);
// SAFETY: At this point we wrote at most 38 bytes, pad up to that point,
// There can only be at most 1 digit remaining.
unsafe
{
...
...
@@ -629,7 +635,7 @@ fn fmt_u128(n: u128, is_nonnegative: bool, f: &mut fmt::Formatter<'_>) -> fmt::R
// UTF-8 since `DEC_DIGITS_LUT` is
let
buf_slice
=
unsafe
{
str
::
from_utf8_unchecked
(
slice
::
from_raw_parts
(
buf_ptr
.offset
(
curr
),
MaybeUninit
::
slice_as_mut_ptr
(
&
mut
buf
)
.offset
(
curr
),
buf
.len
()
-
curr
as
usize
,
))
};
...
...
library/core/src/mem/maybe_uninit.rs
浏览文件 @
ed96321e
...
...
@@ -842,13 +842,13 @@ pub unsafe fn slice_assume_init_mut(slice: &mut [Self]) -> &mut [T] {
#[unstable(feature
=
"maybe_uninit_slice"
,
issue
=
"63569"
)]
#[inline(always)]
pub
fn
slice_as_ptr
(
this
:
&
[
MaybeUninit
<
T
>
])
->
*
const
T
{
this
as
*
const
[
MaybeUninit
<
T
>
]
as
*
const
T
this
.as_ptr
()
as
*
const
T
}
/// Gets a mutable pointer to the first element of the array.
#[unstable(feature
=
"maybe_uninit_slice"
,
issue
=
"63569"
)]
#[inline(always)]
pub
fn
slice_as_mut_ptr
(
this
:
&
mut
[
MaybeUninit
<
T
>
])
->
*
mut
T
{
this
as
*
mut
[
MaybeUninit
<
T
>
]
as
*
mut
T
this
.as_mut_ptr
()
as
*
mut
T
}
}
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