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14cb8580
编写于
7月 20, 2017
作者:
R
Ralf Jung
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
always test alignment in memory.rs
上级
f822ad5c
变更
5
隐藏空白更改
内联
并排
Showing
5 changed file
with
52 addition
and
16 deletion
+52
-16
src/memory.rs
src/memory.rs
+30
-11
src/terminator/intrinsic.rs
src/terminator/intrinsic.rs
+6
-3
src/terminator/mod.rs
src/terminator/mod.rs
+2
-2
tests/compile-fail/unaligned_ptr_cast_zst.rs
tests/compile-fail/unaligned_ptr_cast_zst.rs
+6
-0
tests/run-pass-fullmir/vecs.rs
tests/run-pass-fullmir/vecs.rs
+8
-0
未找到文件。
src/memory.rs
浏览文件 @
14cb8580
...
...
@@ -194,7 +194,7 @@ pub fn allocate_cached(&mut self, bytes: &[u8]) -> EvalResult<'tcx, MemoryPointe
}
let
ptr
=
self
.allocate
(
bytes
.len
()
as
u64
,
1
,
Kind
::
UninitializedStatic
)
?
;
self
.write_bytes
(
PrimVal
::
Ptr
(
ptr
),
bytes
)
?
;
self
.write_bytes
(
ptr
.into
(
),
bytes
)
?
;
self
.mark_static_initalized
(
ptr
.alloc_id
,
Mutability
::
Immutable
)
?
;
self
.literal_alloc_cache
.insert
(
bytes
.to_vec
(),
ptr
.alloc_id
);
Ok
(
ptr
)
...
...
@@ -280,6 +280,7 @@ pub fn endianess(&self) -> layout::Endian {
self
.layout.endian
}
/// Check that the pointer is aligned and non-NULL
pub
fn
check_align
(
&
self
,
ptr
:
Pointer
,
align
:
u64
)
->
EvalResult
<
'tcx
>
{
let
offset
=
match
ptr
.into_inner_primval
()
{
PrimVal
::
Ptr
(
ptr
)
=>
{
...
...
@@ -532,13 +533,13 @@ pub fn leak_report(&self) -> usize {
/// Byte accessors
impl
<
'a
,
'tcx
>
Memory
<
'a
,
'tcx
>
{
fn
get_bytes_unchecked
(
&
self
,
ptr
:
MemoryPointer
,
size
:
u64
,
align
:
u64
)
->
EvalResult
<
'tcx
,
&
[
u8
]
>
{
if
size
==
0
{
return
Ok
(
&
[]);
}
// FIXME: check alignment for zst memory accesses?
// Zero-sized accesses can use dangling pointers, but they still have to be aligned and non-NULL
if
self
.reads_are_aligned
{
self
.check_align
(
ptr
.into
(),
align
)
?
;
}
if
size
==
0
{
return
Ok
(
&
[]);
}
self
.check_bounds
(
ptr
.offset
(
size
,
self
.layout
)
?
,
true
)
?
;
// if ptr.offset is in bounds, then so is ptr (because offset checks for overflow)
let
alloc
=
self
.get
(
ptr
.alloc_id
)
?
;
assert_eq!
(
ptr
.offset
as
usize
as
u64
,
ptr
.offset
);
...
...
@@ -548,13 +549,13 @@ fn get_bytes_unchecked(&self, ptr: MemoryPointer, size: u64, align: u64) -> Eval
}
fn
get_bytes_unchecked_mut
(
&
mut
self
,
ptr
:
MemoryPointer
,
size
:
u64
,
align
:
u64
)
->
EvalResult
<
'tcx
,
&
mut
[
u8
]
>
{
if
size
==
0
{
return
Ok
(
&
mut
[]);
}
// FIXME: check alignment for zst memory accesses?
// Zero-sized accesses can use dangling pointers, but they still have to be aligned and non-NULL
if
self
.writes_are_aligned
{
self
.check_align
(
ptr
.into
(),
align
)
?
;
}
if
size
==
0
{
return
Ok
(
&
mut
[]);
}
self
.check_bounds
(
ptr
.offset
(
size
,
self
.layout
)
?
,
true
)
?
;
// if ptr.offset is in bounds, then so is ptr (because offset checks for overflow)
let
alloc
=
self
.get_mut
(
ptr
.alloc_id
)
?
;
assert_eq!
(
ptr
.offset
as
usize
as
u64
,
ptr
.offset
);
...
...
@@ -643,7 +644,13 @@ pub fn mark_static_initalized(&mut self, alloc_id: AllocId, mutability: Mutabili
pub
fn
copy
(
&
mut
self
,
src
:
Pointer
,
dest
:
Pointer
,
size
:
u64
,
align
:
u64
,
nonoverlapping
:
bool
)
->
EvalResult
<
'tcx
>
{
if
size
==
0
{
// TODO: Should we check for alignment here? (Also see write_bytes intrinsic)
// Empty accesses don't need to be valid pointers, but they should still be aligned
if
self
.reads_are_aligned
{
self
.check_align
(
src
,
align
)
?
;
}
if
self
.writes_are_aligned
{
self
.check_align
(
dest
,
align
)
?
;
}
return
Ok
(());
}
let
src
=
src
.to_ptr
()
?
;
...
...
@@ -695,13 +702,21 @@ pub fn read_c_str(&self, ptr: MemoryPointer) -> EvalResult<'tcx, &[u8]> {
pub
fn
read_bytes
(
&
self
,
ptr
:
Pointer
,
size
:
u64
)
->
EvalResult
<
'tcx
,
&
[
u8
]
>
{
if
size
==
0
{
// Empty accesses don't need to be valid pointers, but they should still be non-NULL
if
self
.reads_are_aligned
{
self
.check_align
(
ptr
,
1
)
?
;
}
return
Ok
(
&
[]);
}
self
.get_bytes
(
ptr
.to_ptr
()
?
,
size
,
1
)
}
pub
fn
write_bytes
(
&
mut
self
,
ptr
:
P
rimVal
,
src
:
&
[
u8
])
->
EvalResult
<
'tcx
>
{
pub
fn
write_bytes
(
&
mut
self
,
ptr
:
P
ointer
,
src
:
&
[
u8
])
->
EvalResult
<
'tcx
>
{
if
src
.is_empty
()
{
// Empty accesses don't need to be valid pointers, but they should still be non-NULL
if
self
.writes_are_aligned
{
self
.check_align
(
ptr
,
1
)
?
;
}
return
Ok
(());
}
let
bytes
=
self
.get_bytes_mut
(
ptr
.to_ptr
()
?
,
src
.len
()
as
u64
,
1
)
?
;
...
...
@@ -711,6 +726,10 @@ pub fn write_bytes(&mut self, ptr: PrimVal, src: &[u8]) -> EvalResult<'tcx> {
pub
fn
write_repeat
(
&
mut
self
,
ptr
:
Pointer
,
val
:
u8
,
count
:
u64
)
->
EvalResult
<
'tcx
>
{
if
count
==
0
{
// Empty accesses don't need to be valid pointers, but they should still be non-NULL
if
self
.writes_are_aligned
{
self
.check_align
(
ptr
,
1
)
?
;
}
return
Ok
(());
}
let
bytes
=
self
.get_bytes_mut
(
ptr
.to_ptr
()
?
,
count
,
1
)
?
;
...
...
src/terminator/intrinsic.rs
浏览文件 @
14cb8580
...
...
@@ -143,11 +143,13 @@ pub(super) fn call_intrinsic(
"copy_nonoverlapping"
=>
{
let
elem_ty
=
substs
.type_at
(
0
);
let
elem_size
=
self
.type_size
(
elem_ty
)
?
.expect
(
"cannot copy unsized value"
);
if
elem_size
!=
0
{
let
count
=
self
.value_to_primval
(
arg_vals
[
2
],
usize
)
?
.to_u64
()
?
;
if
count
*
elem_size
!=
0
{
// TODO: We do not even validate alignment for the 0-bytes case. libstd relies on this in vec::IntoIter::next.
// Also see the write_bytes intrinsic.
let
elem_align
=
self
.type_align
(
elem_ty
)
?
;
let
src
=
arg_vals
[
0
]
.into_ptr
(
&
mut
self
.memory
)
?
;
let
dest
=
arg_vals
[
1
]
.into_ptr
(
&
mut
self
.memory
)
?
;
let
count
=
self
.value_to_primval
(
arg_vals
[
2
],
usize
)
?
.to_u64
()
?
;
self
.memory
.copy
(
src
,
dest
,
count
*
elem_size
,
elem_align
,
intrinsic_name
.ends_with
(
"_nonoverlapping"
))
?
;
}
}
...
...
@@ -465,7 +467,8 @@ pub(super) fn call_intrinsic(
let
ptr
=
arg_vals
[
0
]
.into_ptr
(
&
mut
self
.memory
)
?
;
let
count
=
self
.value_to_primval
(
arg_vals
[
2
],
usize
)
?
.to_u64
()
?
;
if
count
>
0
{
// TODO: Should we, at least, validate the alignment? (Also see memory::copy)
// HashMap relies on write_bytes on a NULL ptr with count == 0 to work
// TODO: Should we, at least, validate the alignment? (Also see the copy intrinsic)
self
.memory
.check_align
(
ptr
,
ty_align
)
?
;
self
.memory
.write_repeat
(
ptr
,
val_byte
,
size
*
count
)
?
;
}
...
...
src/terminator/mod.rs
浏览文件 @
14cb8580
...
...
@@ -813,8 +813,8 @@ fn call_c_abi(
if
let
Some
((
name
,
value
))
=
new
{
// +1 for the null terminator
let
value_copy
=
self
.memory
.allocate
((
value
.len
()
+
1
)
as
u64
,
1
,
Kind
::
Env
)
?
;
self
.memory
.write_bytes
(
PrimVal
::
Ptr
(
value_copy
),
&
value
)
?
;
self
.memory
.write_bytes
(
PrimVal
::
Ptr
(
value_copy
.offset
(
value
.len
()
as
u64
,
self
.memory.layout
)
?
),
&
[
0
])
?
;
self
.memory
.write_bytes
(
value_copy
.into
(
),
&
value
)
?
;
self
.memory
.write_bytes
(
value_copy
.offset
(
value
.len
()
as
u64
,
self
.memory.layout
)
?
.into
(
),
&
[
0
])
?
;
if
let
Some
(
var
)
=
self
.env_vars
.insert
(
name
.to_owned
(),
value_copy
)
{
self
.memory
.deallocate
(
var
,
None
,
Kind
::
Env
)
?
;
}
...
...
tests/compile-fail/unaligned_ptr_cast_zst.rs
0 → 100644
浏览文件 @
14cb8580
fn
main
()
{
let
x
=
&
2u16
;
let
x
=
x
as
*
const
_
as
*
const
[
u32
;
0
];
// This must fail because alignment is violated. Test specifically for loading ZST.
let
_
x
=
unsafe
{
*
x
};
//~ ERROR: tried to access memory with alignment 2, but alignment 4 is required
}
tests/run-pass-fullmir/vecs.rs
浏览文件 @
14cb8580
...
...
@@ -24,6 +24,13 @@ fn vec_into_iter() -> u8 {
.fold
(
0
,
|
x
,
y
|
x
+
y
)
}
fn
vec_into_iter_zst
()
->
usize
{
vec!
[[
0u64
;
0
],
[
0u64
;
0
]]
.into_iter
()
.map
(|
x
|
x
.len
())
.sum
()
}
fn
vec_reallocate
()
->
Vec
<
u8
>
{
let
mut
v
=
vec!
[
1
,
2
];
v
.push
(
3
);
...
...
@@ -35,6 +42,7 @@ fn vec_reallocate() -> Vec<u8> {
fn
main
()
{
assert_eq!
(
vec_reallocate
()
.len
(),
5
);
assert_eq!
(
vec_into_iter
(),
30
);
assert_eq!
(
vec_into_iter_zst
(),
0
);
assert_eq!
(
make_vec
()
.capacity
(),
4
);
assert_eq!
(
make_vec_macro
(),
[
1
,
2
]);
assert_eq!
(
make_vec_macro_repeat
(),
[
42
;
5
]);
...
...
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