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Invalid byte alignment expected/provided in message #58617

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This commit is contained in:
Patrick McCarter 2019-02-22 15:49:07 -05:00
parent eac09088e1
commit 5f27a25cf4
3 changed files with 10 additions and 7 deletions
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6
src/librustc_mir/interpret/validity.rs
View File

@ -357,8 +357,10 @@ impl<'rt, 'a, 'mir, 'tcx, M: Machine<'a, 'mir, 'tcx>>
match err.kind {
EvalErrorKind::InvalidNullPointerUsage =>
return validation_failure!("NULL reference", self.path),
EvalErrorKind::AlignmentCheckFailed { .. } =>
return validation_failure!("unaligned reference", self.path),
EvalErrorKind::AlignmentCheckFailed { required, has } =>
return validation_failure!(format!("unaligned reference \
(required {} alignment but found {})",
required.bytes(), has.bytes()), self.path),
_ =>
return validation_failure!(
"dangling (out-of-bounds) reference (might be NULL at \

1
src/test/ui/consts/const-eval/ub-ref.rs
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@ -5,6 +5,7 @@ use std::mem;
const UNALIGNED: &u16 = unsafe { mem::transmute(&[0u8; 4]) };
//~^ ERROR it is undefined behavior to use this value
//~^^ type validation failed: encountered unaligned reference (required 2 alignment but found 1)
const NULL: &u16 = unsafe { mem::transmute(0usize) };
//~^ ERROR it is undefined behavior to use this value

10
src/test/ui/consts/const-eval/ub-ref.stderr
View File

@ -2,12 +2,12 @@ error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-ref.rs:6:1
|
LL | const UNALIGNED: &u16 = unsafe { mem::transmute(&[0u8; 4]) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered unaligned reference
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered unaligned reference (required 2 alignment but found 1)
|
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rust compiler repository if you believe it should not be considered undefined behavior
error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-ref.rs:9:1
--> $DIR/ub-ref.rs:10:1
|
LL | const NULL: &u16 = unsafe { mem::transmute(0usize) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered 0, but expected something greater or equal to 1
@ -15,7 +15,7 @@ LL | const NULL: &u16 = unsafe { mem::transmute(0usize) };
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rust compiler repository if you believe it should not be considered undefined behavior
error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-ref.rs:12:1
--> $DIR/ub-ref.rs:13:1
|
LL | const REF_AS_USIZE: usize = unsafe { mem::transmute(&0) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered a pointer, but expected initialized plain (non-pointer) bytes
@ -23,7 +23,7 @@ LL | const REF_AS_USIZE: usize = unsafe { mem::transmute(&0) };
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rust compiler repository if you believe it should not be considered undefined behavior
error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-ref.rs:15:1
--> $DIR/ub-ref.rs:16:1
|
LL | const REF_AS_USIZE_SLICE: &[usize] = &[unsafe { mem::transmute(&0) }];
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered a pointer at .<deref>, but expected plain (non-pointer) bytes
@ -31,7 +31,7 @@ LL | const REF_AS_USIZE_SLICE: &[usize] = &[unsafe { mem::transmute(&0) }];
= note: The rules on what exactly is undefined behavior aren't clear, so this check might be overzealous. Please open an issue on the rust compiler repository if you believe it should not be considered undefined behavior
error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-ref.rs:18:1
--> $DIR/ub-ref.rs:19:1
|
LL | const USIZE_AS_REF: &'static u8 = unsafe { mem::transmute(1337usize) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered integer pointer in non-ZST reference