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体验新版 GitCode,发现更多精彩内容 >>
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936fa6f6
编写于
8月 04, 2018
作者:
N
Niko Matsakis
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差异文件
generalize the Deref case and simplify the code
上级
e7d8d651
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
20 addition
and
11 deletion
+20
-11
src/librustc_mir/borrow_check/nll/escaping_locals.rs
src/librustc_mir/borrow_check/nll/escaping_locals.rs
+20
-11
未找到文件。
src/librustc_mir/borrow_check/nll/escaping_locals.rs
浏览文件 @
936fa6f6
...
...
@@ -44,7 +44,7 @@
use
rustc
::
mir
::
visit
::
Visitor
;
use
rustc
::
mir
::
*
;
use
rustc
::
ty
::
{
self
,
TyCtxt
}
;
use
rustc
::
ty
::
TyCtxt
;
use
rustc_data_structures
::
indexed_vec
::
Idx
;
use
rustc_data_structures
::
unify
as
ut
;
...
...
@@ -178,20 +178,29 @@ fn visit_assign(
match
rvalue
{
Rvalue
::
Use
(
op
)
=>
self
.union_locals_if_needed
(
local
,
find_local_in_operand
(
op
)),
Rvalue
::
Ref
(
_
,
_
,
place
)
=>
{
// Special case: if you have `X = &*Y` where `Y` is a
// reference, then the outlives relationships should
// ensure that all regions in `Y` are constrained by
// regions in `X`.
if
let
Place
::
Projection
(
proj
)
=
place
{
// Special case: if you have `X = &*Y` (or `X = &**Y`
// etc), then the outlives relationships will ensure
// that all regions in `Y` are constrained by regions
// in `X` -- this is because the lifetimes of the
// references we deref through are required to outlive
// the borrow lifetime (which appears in `X`).
//
// (We don't actually need to check the type of `Y`:
// since `ProjectionElem::Deref` represents a built-in
// deref and not an overloaded deref, if the thing we
// deref through is not a reference, then it must be a
// `Box` or `*const`, in which case it contains no
// references.)
let
mut
place_ref
=
place
;
while
let
Place
::
Projection
(
proj
)
=
place_ref
{
if
let
ProjectionElem
::
Deref
=
proj
.elem
{
if
let
ty
::
TyRef
(
..
)
=
proj
.base
.ty
(
self
.mir
,
self
.tcx
)
.to_ty
(
self
.tcx
)
.sty
{
self
.union_locals_if_needed
(
local
,
find_local_in_place
(
&
proj
.base
));
}
place_ref
=
&
proj
.base
;
}
else
{
break
;
}
}
self
.union_locals_if_needed
(
local
,
find_local_in_place
(
place
))
self
.union_locals_if_needed
(
local
,
find_local_in_place
(
place
_ref
))
}
Rvalue
::
Cast
(
kind
,
op
,
_
)
=>
match
kind
{
...
...
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