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体验新版 GitCode,发现更多精彩内容 >>
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05067cf9
编写于
5月 16, 2018
作者:
V
varkor
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电子邮件补丁
差异文件
Fix an ICE when attempting to transmute an uninhabited type
上级
dbd10f81
变更
2
隐藏空白更改
内联
并排
Showing
2 changed file
with
46 addition
and
3 deletion
+46
-3
src/librustc_codegen_llvm/mir/block.rs
src/librustc_codegen_llvm/mir/block.rs
+13
-3
src/test/compile-fail/never_transmute_never.rs
src/test/compile-fail/never_transmute_never.rs
+33
-0
未找到文件。
src/librustc_codegen_llvm/mir/block.rs
浏览文件 @
05067cf9
...
...
@@ -428,9 +428,19 @@ fn codegen_terminator(&mut self,
let
intrinsic
=
intrinsic
.as_ref
()
.map
(|
s
|
&
s
[
..
]);
if
intrinsic
==
Some
(
"transmute"
)
{
let
&
(
ref
dest
,
target
)
=
destination
.as_ref
()
.unwrap
();
self
.codegen_transmute
(
&
bx
,
&
args
[
0
],
dest
);
funclet_br
(
self
,
bx
,
target
);
if
let
Some
(
destination_ref
)
=
destination
.as_ref
()
{
let
&
(
ref
dest
,
target
)
=
destination_ref
;
self
.trans_transmute
(
&
bx
,
&
args
[
0
],
dest
);
funclet_br
(
self
,
bx
,
target
);
}
else
{
// If we are trying to transmute to an uninhabited type,
// it is likely there is no allotted destination. In fact,
// transmuting to an uninhabited type is UB, which means
// we can do what we like. Here, we declare that transmuting
// into an uninhabited type is impossible, so anything following
// it must be unreachable.
bx
.unreachable
();
}
return
;
}
...
...
src/test/compile-fail/never_transmute_never.rs
0 → 100644
浏览文件 @
05067cf9
// Copyright 2018 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.
// compile-pass
#![crate_type=
"lib"
]
#![feature(never_type)]
#![allow(dead_code)]
#![allow(unreachable_code)]
#![allow(unused_variables)]
struct
Foo
;
pub
fn
f
(
x
:
!
)
->
!
{
x
}
pub
fn
ub
()
{
// This is completely undefined behaviour,
// but we still want to make sure it compiles.
let
x
:
!
=
unsafe
{
std
::
mem
::
transmute
::
<
Foo
,
!>
(
Foo
)
};
f
(
x
)
}
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