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体验新版 GitCode,发现更多精彩内容 >>
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f60a7c47
编写于
7月 22, 2014
作者:
N
Niko Matsakis
浏览文件
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电子邮件补丁
差异文件
Fix regionck to consider bounds on a proc when capturing variables
上级
b5165321
变更
5
显示空白变更内容
内联
并排
Showing
5 changed file
with
96 addition
and
4 deletion
+96
-4
src/librustc/middle/typeck/check/regionck.rs
src/librustc/middle/typeck/check/regionck.rs
+6
-0
src/librustc/middle/typeck/infer/error_reporting.rs
src/librustc/middle/typeck/infer/error_reporting.rs
+26
-4
src/librustc/middle/typeck/infer/mod.rs
src/librustc/middle/typeck/infer/mod.rs
+7
-0
src/test/compile-fail/regions-infer-proc-static-upvar.rs
src/test/compile-fail/regions-infer-proc-static-upvar.rs
+34
-0
src/test/run-pass/regions-infer-static-from-proc.rs
src/test/run-pass/regions-infer-static-from-proc.rs
+23
-0
未找到文件。
src/librustc/middle/typeck/check/regionck.rs
浏览文件 @
f60a7c47
...
...
@@ -1534,6 +1534,12 @@ fn adjust_borrow_kind_for_assignment_lhs(rcx: &Rcx,
fn
adjust_upvar_borrow_kind_for_mut
(
rcx
:
&
Rcx
,
cmt
:
mc
::
cmt
)
{
/*!
* Indicates that `cmt` is being directly mutated (e.g., assigned
* to). If cmt contains any by-ref upvars, this implies that
* those upvars must be borrowed using an `&mut` borow.
*/
let
mut
cmt
=
cmt
;
loop
{
debug!
(
"adjust_upvar_borrow_kind_for_mut(cmt={})"
,
...
...
src/librustc/middle/typeck/infer/error_reporting.rs
浏览文件 @
f60a7c47
...
...
@@ -583,6 +583,19 @@ fn report_concrete_failure(&self,
sub
,
""
);
}
infer
::
ProcCapture
(
span
,
id
)
=>
{
self
.tcx.sess
.span_err
(
span
,
format!
(
"captured variable `{}` must be 'static
\
to be captured in a proc"
,
ty
::
local_var_name_str
(
self
.tcx
,
id
)
.get
())
.as_slice
());
note_and_explain_region
(
self
.tcx
,
"captured variable is only valid for "
,
sup
,
""
);
}
infer
::
IndexSlice
(
span
)
=>
{
self
.tcx.sess
.span_err
(
span
,
"index of slice outside its lifetime"
);
...
...
@@ -1423,11 +1436,11 @@ fn report_inference_failure(&self,
bound_region_to_string
(
self
.tcx
,
"lifetime parameter "
,
true
,
br
))
}
infer
::
EarlyBoundRegion
(
_
,
name
)
=>
{
format!
(
" for lifetime parameter `{}"
,
format!
(
" for lifetime parameter `{}
`
"
,
token
::
get_name
(
name
)
.get
())
}
infer
::
BoundRegionInCoherence
(
name
)
=>
{
format!
(
" for lifetime parameter `{} in coherence check"
,
format!
(
" for lifetime parameter `{}
`
in coherence check"
,
token
::
get_name
(
name
)
.get
())
}
infer
::
UpvarRegion
(
ref
upvar_id
,
_
)
=>
{
...
...
@@ -1528,6 +1541,15 @@ fn note_region_origin(&self, origin: &SubregionOrigin) {
self
.tcx
,
id
)
.get
()
.to_string
())
.as_slice
());
}
infer
::
ProcCapture
(
span
,
id
)
=>
{
self
.tcx.sess
.span_note
(
span
,
format!
(
"...so that captured variable `{}`
\
is 'static"
,
ty
::
local_var_name_str
(
self
.tcx
,
id
)
.get
())
.as_slice
());
}
infer
::
IndexSlice
(
span
)
=>
{
self
.tcx.sess
.span_note
(
span
,
...
...
@@ -1571,8 +1593,8 @@ fn note_region_origin(&self, origin: &SubregionOrigin) {
infer
::
AutoBorrow
(
span
)
=>
{
self
.tcx.sess
.span_note
(
span
,
"...so that reference is valid
\
at the time of
implicit
borrow"
);
"...so that
auto-
reference is valid
\
at the time of borrow"
);
}
infer
::
ExprTypeIsNotInScope
(
t
,
span
)
=>
{
self
.tcx.sess
.span_note
(
...
...
src/librustc/middle/typeck/infer/mod.rs
浏览文件 @
f60a7c47
...
...
@@ -161,6 +161,9 @@ pub enum SubregionOrigin {
// Closure bound must not outlive captured free variables
FreeVariable
(
Span
,
ast
::
NodeId
),
// Proc upvars must be 'static
ProcCapture
(
Span
,
ast
::
NodeId
),
// Index into slice must be within its lifetime
IndexSlice
(
Span
),
...
...
@@ -933,6 +936,7 @@ pub fn span(&self) -> Span {
InvokeClosure
(
a
)
=>
a
,
DerefPointer
(
a
)
=>
a
,
FreeVariable
(
a
,
_
)
=>
a
,
ProcCapture
(
a
,
_
)
=>
a
,
IndexSlice
(
a
)
=>
a
,
RelateObjectBound
(
a
)
=>
a
,
RelateProcBound
(
a
,
_
,
_
)
=>
a
,
...
...
@@ -972,6 +976,9 @@ fn repr(&self, tcx: &ty::ctxt) -> String {
FreeVariable
(
a
,
b
)
=>
{
format!
(
"FreeVariable({}, {})"
,
a
.repr
(
tcx
),
b
)
}
ProcCapture
(
a
,
b
)
=>
{
format!
(
"ProcCapture({}, {})"
,
a
.repr
(
tcx
),
b
)
}
IndexSlice
(
a
)
=>
{
format!
(
"IndexSlice({})"
,
a
.repr
(
tcx
))
}
...
...
src/test/compile-fail/regions-infer-proc-static-upvar.rs
0 → 100644
浏览文件 @
f60a7c47
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// Test that, when a variable of type `&T` is captured inside a proc,
// we correctly infer/require that its lifetime is 'static.
fn
foo
(
_
p
:
proc
():
'static
)
{
}
static
i
:
int
=
3
;
fn
capture_local
()
{
let
x
=
3
i
;
let
y
=
&
x
;
//~ ERROR `x` does not live long enough
foo
(
proc
()
{
let
_
a
=
*
y
;
});
}
fn
capture_static
()
{
// Legal because &i can have static lifetime:
let
y
=
&
i
;
foo
(
proc
()
{
let
_
a
=
*
y
;
});
}
fn
main
()
{
}
src/test/run-pass/regions-infer-static-from-proc.rs
0 → 100644
浏览文件 @
f60a7c47
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// Check that the 'static bound on a proc influences lifetimes of
// region variables contained within (otherwise, region inference will
// give `x` a very short lifetime).
static
i
:
uint
=
3
;
fn
foo
(
_
:
proc
():
'static
)
{}
fn
read
(
_
:
uint
)
{
}
pub
fn
main
()
{
let
x
=
&
i
;
foo
(
proc
()
{
read
(
*
x
);
});
}
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