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体验新版 GitCode,发现更多精彩内容 >>
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45fe3a1a
编写于
10月 04, 2016
作者:
A
Ariel Ben-Yehuda
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
emit an assume that cast-from enums are in range
Fixes #36955.
上级
92333662
变更
3
隐藏空白更改
内联
并排
Showing
3 changed file
with
51 addition
and
1 deletion
+51
-1
src/librustc_trans/base.rs
src/librustc_trans/base.rs
+5
-0
src/librustc_trans/mir/rvalue.rs
src/librustc_trans/mir/rvalue.rs
+22
-1
src/test/codegen/enum-bounds-check.rs
src/test/codegen/enum-bounds-check.rs
+24
-0
未找到文件。
src/librustc_trans/base.rs
浏览文件 @
45fe3a1a
...
...
@@ -522,6 +522,11 @@ pub fn need_invoke(bcx: Block) -> bool {
}
}
pub
fn
call_assume
<
'a
,
'tcx
>
(
b
:
&
Builder
<
'a
,
'tcx
>
,
val
:
ValueRef
)
{
let
assume_intrinsic
=
b
.ccx
.get_intrinsic
(
"llvm.assume"
);
b
.call
(
assume_intrinsic
,
&
[
val
],
None
);
}
/// Helper for loading values from memory. Does the necessary conversion if the in-memory type
/// differs from the type used for SSA values. Also handles various special cases where the type
/// gives us better information about what we are loading.
...
...
src/librustc_trans/mir/rvalue.rs
浏览文件 @
45fe3a1a
...
...
@@ -11,12 +11,14 @@
use
llvm
::{
self
,
ValueRef
};
use
rustc
::
ty
::{
self
,
Ty
};
use
rustc
::
ty
::
cast
::{
CastTy
,
IntTy
};
use
rustc
::
ty
::
layout
::
Layout
;
use
rustc
::
mir
::
repr
as
mir
;
use
asm
;
use
base
;
use
callee
::
Callee
;
use
common
::{
self
,
val_ty
,
C_bool
,
C_null
,
C_uint
,
BlockAndBuilder
,
Result
};
use
common
::{
C_integral
};
use
debuginfo
::
DebugLoc
;
use
adt
;
use
machine
;
...
...
@@ -282,7 +284,26 @@ pub fn trans_rvalue_operand(&mut self,
}
OperandValue
::
Pair
(
..
)
=>
bug!
(
"Unexpected Pair operand"
)
};
(
discr
,
adt
::
is_discr_signed
(
&
l
))
let
(
signed
,
min
,
max
)
=
match
l
{
&
Layout
::
CEnum
{
signed
,
min
,
max
,
..
}
=>
{
(
signed
,
min
,
max
)
}
_
=>
bug!
(
"CEnum {:?} is not an enum"
,
operand
)
};
if
max
>
min
{
// We want `table[e as usize]` to not
// have bound checks, and this is the most
// convenient place to put the `assume`.
base
::
call_assume
(
&
bcx
,
bcx
.icmp
(
llvm
::
IntULE
,
discr
,
C_integral
(
common
::
val_ty
(
discr
),
max
,
false
)
))
}
(
discr
,
signed
)
}
else
{
(
operand
.immediate
(),
operand
.ty
.is_signed
())
};
...
...
src/test/codegen/enum-bounds-check.rs
0 → 100644
浏览文件 @
45fe3a1a
// Copyright 2016 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-flags: -O
#![crate_type
=
"lib"
]
pub
enum
Foo
{
A
,
B
}
// CHECK-LABEL: @lookup
#[no_mangle]
pub
fn
lookup
(
buf
:
&
[
u8
;
2
],
f
:
Foo
)
->
u8
{
// CHECK-NOT: panic_bounds_check
buf
[
f
as
usize
]
}
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