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Rollup merge of #64014 - RalfJung:miri-slice, r=oli-obk

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miri: detect too large dynamically sized objects

Needed to make https://github.com/rust-lang/miri/pull/929 pass.

r? @oli-obk
This commit is contained in:
Mazdak Farrokhzad 2019-08-30 23:08:06 +02:00 committed by GitHub
commit 1dc8b2304f
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GPG Key ID: 4AEE18F83AFDEB23
7 changed files with 115 additions and 69 deletions
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25
src/librustc_mir/interpret/eval_context.rs
View File

@ -442,27 +442,30 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
// Issue #27023: must add any necessary padding to `size`
// (to make it a multiple of `align`) before returning it.
//
// Namely, the returned size should be, in C notation:
//
// `size + ((size & (align-1)) ? align : 0)`
//
// emulated via the semi-standard fast bit trick:
//
// `(size + (align-1)) & -align`
let size = size.align_to(align);
Ok(Some((size.align_to(align), align)))
// Check if this brought us over the size limit.
if size.bytes() >= self.tcx.data_layout().obj_size_bound() {
throw_ub_format!("wide pointer metadata contains invalid information: \
total size is bigger than largest supported object");
}
Ok(Some((size, align)))
}
ty::Dynamic(..) => {
let vtable = metadata.expect("dyn trait fat ptr must have vtable");
// the second entry in the vtable is the dynamic size of the object.
// Read size and align from vtable (already checks size).
Ok(Some(self.read_size_and_align_from_vtable(vtable)?))
}
ty::Slice(_) | ty::Str => {
let len = metadata.expect("slice fat ptr must have vtable").to_usize(self)?;
let elem = layout.field(self, 0)?;
Ok(Some((elem.size * len, elem.align.abi)))
// Make sure the slice is not too big.
let size = elem.size.checked_mul(len, &*self.tcx)
.ok_or_else(|| err_ub_format!("invalid slice: \
total size is bigger than largest supported object"))?;
Ok(Some((size, elem.align.abi)))
}
ty::Foreign(_) => {

7
src/librustc_mir/interpret/traits.rs
View File

@ -1,5 +1,5 @@
use rustc::ty::{self, Ty, Instance, TypeFoldable};
use rustc::ty::layout::{Size, Align, LayoutOf};
use rustc::ty::layout::{Size, Align, LayoutOf, HasDataLayout};
use rustc::mir::interpret::{Scalar, Pointer, InterpResult, PointerArithmetic,};
use super::{InterpCx, Machine, MemoryKind, FnVal};
@ -151,6 +151,11 @@ impl<'mir, 'tcx, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
vtable.offset(pointer_size * 2, self)?,
)?.not_undef()?;
let align = self.force_bits(align, pointer_size)? as u64;
if size >= self.tcx.data_layout().obj_size_bound() {
throw_ub_format!("invalid vtable: \
size is bigger than largest supported object");
}
Ok((Size::from_bytes(size), Align::from_bytes(align).unwrap()))
}
}

6
src/librustc_mir/interpret/validity.rs
View File

@ -1,3 +1,9 @@
//! Check the validity invariant of a given value, and tell the user
//! where in the value it got violated.
//! In const context, this goes even further and tries to approximate const safety.
//! That's useful because it means other passes (e.g. promotion) can rely on `const`s
//! to be const-safe.
use std::fmt::Write;
use std::ops::RangeInclusive;

13
src/test/ui/consts/const-eval/dangling.rs Normal file
View File

@ -0,0 +1,13 @@
#![feature(const_transmute, const_raw_ptr_deref)]
use std::{mem, usize};
// Make sure we error with the right kind of error on a too large slice.
const TEST: () = { unsafe { //~ NOTE
let slice: *const [u8] = mem::transmute((1usize, usize::MAX));
let _val = &*slice; //~ ERROR: any use of this value will cause an error
//~^ NOTE: total size is bigger than largest supported object
//~^^ on by default
} };
fn main() {}

16
src/test/ui/consts/const-eval/dangling.stderr Normal file
View File

@ -0,0 +1,16 @@
error: any use of this value will cause an error
--> $DIR/dangling.rs:8:16
|
LL | / const TEST: () = { unsafe {
LL | | let slice: *const [u8] = mem::transmute((1usize, usize::MAX));
LL | | let _val = &*slice;
| | ^^^^^^^ invalid slice: total size is bigger than largest supported object
LL | |
LL | |
LL | | } };
| |____-
|
= note: `#[deny(const_err)]` on by default
error: aborting due to previous error

23
src/test/ui/consts/const-eval/ub-wide-ptr.rs
View File

@ -7,6 +7,7 @@
// normalize-stderr-test "allocation \d+" -> "allocation N"
// normalize-stderr-test "size \d+" -> "size N"
#[repr(C)]
union BoolTransmute {
val: u8,
bl: bool,
@ -26,6 +27,7 @@ struct BadSliceRepr {
len: &'static u8,
}
#[repr(C)]
union SliceTransmute {
repr: SliceRepr,
bad: BadSliceRepr,
@ -58,6 +60,7 @@ struct BadDynRepr {
vtable: usize,
}
#[repr(C)]
union DynTransmute {
repr: DynRepr,
repr2: DynRepr2,
@ -91,10 +94,10 @@ const MY_STR_LENGTH_PTR: &MyStr = unsafe { SliceTransmute { bad: BadSliceRepr {
//~^ ERROR it is undefined behavior to use this value
// invalid UTF-8
const J1: &str = unsafe { SliceTransmute { slice: &[0xFF] }.str };
const STR_NO_UTF8: &str = unsafe { SliceTransmute { slice: &[0xFF] }.str };
//~^ ERROR it is undefined behavior to use this value
// invalid UTF-8 in user-defined str-like
const J2: &MyStr = unsafe { SliceTransmute { slice: &[0xFF] }.my_str };
const MYSTR_NO_UTF8: &MyStr = unsafe { SliceTransmute { slice: &[0xFF] }.my_str };
//~^ ERROR it is undefined behavior to use this value
// # slice
@ -111,16 +114,16 @@ const SLICE_LENGTH_PTR: &[u8] = unsafe { SliceTransmute { bad: BadSliceRepr { pt
//~^ ERROR it is undefined behavior to use this value
// bad data *inside* the slice
const H: &[bool] = &[unsafe { BoolTransmute { val: 3 }.bl }];
const SLICE_CONTENT_INVALID: &[bool] = &[unsafe { BoolTransmute { val: 3 }.bl }];
//~^ ERROR it is undefined behavior to use this value
// good MySliceBool
const I1: &MySliceBool = &MySlice(true, [false]);
const MYSLICE_GOOD: &MySliceBool = &MySlice(true, [false]);
// bad: sized field is not okay
const I2: &MySliceBool = &MySlice(unsafe { BoolTransmute { val: 3 }.bl }, [false]);
const MYSLICE_PREFIX_BAD: &MySliceBool = &MySlice(unsafe { BoolTransmute { val: 3 }.bl }, [false]);
//~^ ERROR it is undefined behavior to use this value
// bad: unsized part is not okay
const I3: &MySliceBool = &MySlice(true, [unsafe { BoolTransmute { val: 3 }.bl }]);
const MYSLICE_SUFFIX_BAD: &MySliceBool = &MySlice(true, [unsafe { BoolTransmute { val: 3 }.bl }]);
//~^ ERROR it is undefined behavior to use this value
// # raw slice
@ -132,17 +135,17 @@ const RAW_SLICE_LENGTH_UNINIT: *const [u8] = unsafe { SliceTransmute { addr: 42
// # trait object
// bad trait object
const D: &dyn Trait = unsafe { DynTransmute { repr: DynRepr { ptr: &92, vtable: &3 } }.rust};
const TRAIT_OBJ_SHORT_VTABLE_1: &dyn Trait = unsafe { DynTransmute { repr: DynRepr { ptr: &92, vtable: &3 } }.rust};
//~^ ERROR it is undefined behavior to use this value
// bad trait object
const E: &dyn Trait = unsafe { DynTransmute { repr2: DynRepr2 { ptr: &92, vtable: &3 } }.rust};
const TRAIT_OBJ_SHORT_VTABLE_2: &dyn Trait = unsafe { DynTransmute { repr2: DynRepr2 { ptr: &92, vtable: &3 } }.rust};
//~^ ERROR it is undefined behavior to use this value
// bad trait object
const F: &dyn Trait = unsafe { DynTransmute { bad: BadDynRepr { ptr: &92, vtable: 3 } }.rust};
const TRAIT_OBJ_INT_VTABLE: &dyn Trait = unsafe { DynTransmute { bad: BadDynRepr { ptr: &92, vtable: 3 } }.rust};
//~^ ERROR it is undefined behavior to use this value
// bad data *inside* the trait object
const G: &dyn Trait = &unsafe { BoolTransmute { val: 3 }.bl };
const TRAIT_OBJ_CONTENT_INVALID: &dyn Trait = &unsafe { BoolTransmute { val: 3 }.bl };
//~^ ERROR it is undefined behavior to use this value
// # raw trait object

94
src/test/ui/consts/const-eval/ub-wide-ptr.stderr
View File

@ -1,5 +1,5 @@
error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:84:1
--> $DIR/ub-wide-ptr.rs:87:1
|
LL | const STR_TOO_LONG: &str = unsafe { SliceTransmute { repr: SliceRepr { ptr: &42, len: 999 } }.str};
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling reference (not entirely in bounds)
@ -7,7 +7,7 @@ LL | const STR_TOO_LONG: &str = unsafe { SliceTransmute { repr: SliceRepr { ptr:
= 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-wide-ptr.rs:87:1
--> $DIR/ub-wide-ptr.rs:90:1
|
LL | const STR_LENGTH_PTR: &str = unsafe { SliceTransmute { bad: BadSliceRepr { ptr: &42, len: &3 } }.str};
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered non-integer slice length in wide pointer
@ -15,31 +15,31 @@ LL | const STR_LENGTH_PTR: &str = unsafe { SliceTransmute { bad: BadSliceRepr {
= 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-wide-ptr.rs:90:1
--> $DIR/ub-wide-ptr.rs:93:1
|
LL | const MY_STR_LENGTH_PTR: &MyStr = unsafe { SliceTransmute { bad: BadSliceRepr { ptr: &42, len: &3 } }.my_str};
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered non-integer slice length in wide pointer
|
= 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-wide-ptr.rs:94:1
|
LL | const J1: &str = unsafe { SliceTransmute { slice: &[0xFF] }.str };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered uninitialized or non-UTF-8 data in str at .<deref>
|
= 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-wide-ptr.rs:97:1
|
LL | const J2: &MyStr = unsafe { SliceTransmute { slice: &[0xFF] }.my_str };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered uninitialized or non-UTF-8 data in str at .<deref>.0
LL | const STR_NO_UTF8: &str = unsafe { SliceTransmute { slice: &[0xFF] }.str };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered uninitialized or non-UTF-8 data in str at .<deref>
|
= 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-wide-ptr.rs:104:1
--> $DIR/ub-wide-ptr.rs:100:1
|
LL | const MYSTR_NO_UTF8: &MyStr = unsafe { SliceTransmute { slice: &[0xFF] }.my_str };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered uninitialized or non-UTF-8 data in str at .<deref>.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-wide-ptr.rs:107:1
|
LL | const SLICE_LENGTH_UNINIT: &[u8] = unsafe { SliceTransmute { addr: 42 }.slice};
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered uninitialized data in wide pointer metadata
@ -47,7 +47,7 @@ LL | const SLICE_LENGTH_UNINIT: &[u8] = unsafe { SliceTransmute { addr: 42 }.sli
= 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-wide-ptr.rs:107:1
--> $DIR/ub-wide-ptr.rs:110:1
|
LL | const SLICE_TOO_LONG: &[u8] = unsafe { SliceTransmute { repr: SliceRepr { ptr: &42, len: 999 } }.slice};
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling reference (not entirely in bounds)
@ -55,7 +55,7 @@ LL | const SLICE_TOO_LONG: &[u8] = unsafe { SliceTransmute { repr: SliceRepr { p
= 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-wide-ptr.rs:110:1
--> $DIR/ub-wide-ptr.rs:113:1
|
LL | const SLICE_LENGTH_PTR: &[u8] = unsafe { SliceTransmute { bad: BadSliceRepr { ptr: &42, len: &3 } }.slice};
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered non-integer slice length in wide pointer
@ -63,71 +63,71 @@ LL | const SLICE_LENGTH_PTR: &[u8] = unsafe { SliceTransmute { bad: BadSliceRepr
= 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-wide-ptr.rs:114:1
--> $DIR/ub-wide-ptr.rs:117:1
|
LL | const H: &[bool] = &[unsafe { BoolTransmute { val: 3 }.bl }];
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered 3 at .<deref>[0], but expected something less or equal to 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-wide-ptr.rs:120:1
|
LL | const I2: &MySliceBool = &MySlice(unsafe { BoolTransmute { val: 3 }.bl }, [false]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered 3 at .<deref>.0, but expected something less or equal to 1
LL | const SLICE_CONTENT_INVALID: &[bool] = &[unsafe { BoolTransmute { val: 3 }.bl }];
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered 3 at .<deref>[0], but expected something less or equal to 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-wide-ptr.rs:123:1
|
LL | const I3: &MySliceBool = &MySlice(true, [unsafe { BoolTransmute { val: 3 }.bl }]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered 3 at .<deref>.1[0], but expected something less or equal to 1
LL | const MYSLICE_PREFIX_BAD: &MySliceBool = &MySlice(unsafe { BoolTransmute { val: 3 }.bl }, [false]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered 3 at .<deref>.0, but expected something less or equal to 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-wide-ptr.rs:130:1
--> $DIR/ub-wide-ptr.rs:126:1
|
LL | const MYSLICE_SUFFIX_BAD: &MySliceBool = &MySlice(true, [unsafe { BoolTransmute { val: 3 }.bl }]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered 3 at .<deref>.1[0], but expected something less or equal to 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-wide-ptr.rs:133:1
|
LL | const RAW_SLICE_LENGTH_UNINIT: *const [u8] = unsafe { SliceTransmute { addr: 42 }.raw_slice};
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered uninitialized data in wide pointer metadata
|
= 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-wide-ptr.rs:135:1
|
LL | const D: &dyn Trait = unsafe { DynTransmute { repr: DynRepr { ptr: &92, vtable: &3 } }.rust};
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling or unaligned vtable pointer in wide pointer or too small vtable
|
= 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-wide-ptr.rs:138:1
|
LL | const E: &dyn Trait = unsafe { DynTransmute { repr2: DynRepr2 { ptr: &92, vtable: &3 } }.rust};
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling or unaligned vtable pointer in wide pointer or too small vtable
LL | const TRAIT_OBJ_SHORT_VTABLE_1: &dyn Trait = unsafe { DynTransmute { repr: DynRepr { ptr: &92, vtable: &3 } }.rust};
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling or unaligned vtable pointer in wide pointer or too small vtable
|
= 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-wide-ptr.rs:141:1
|
LL | const F: &dyn Trait = unsafe { DynTransmute { bad: BadDynRepr { ptr: &92, vtable: 3 } }.rust};
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling or unaligned vtable pointer in wide pointer or too small vtable
LL | const TRAIT_OBJ_SHORT_VTABLE_2: &dyn Trait = unsafe { DynTransmute { repr2: DynRepr2 { ptr: &92, vtable: &3 } }.rust};
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling or unaligned vtable pointer in wide pointer or too small vtable
|
= 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-wide-ptr.rs:145:1
--> $DIR/ub-wide-ptr.rs:144:1
|
LL | const G: &dyn Trait = &unsafe { BoolTransmute { val: 3 }.bl };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered 3 at .<deref>.<dyn-downcast>, but expected something less or equal to 1
LL | const TRAIT_OBJ_INT_VTABLE: &dyn Trait = unsafe { DynTransmute { bad: BadDynRepr { ptr: &92, vtable: 3 } }.rust};
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling or unaligned vtable pointer in wide pointer or too small vtable
|
= 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-wide-ptr.rs:149:1
--> $DIR/ub-wide-ptr.rs:148:1
|
LL | const TRAIT_OBJ_CONTENT_INVALID: &dyn Trait = &unsafe { BoolTransmute { val: 3 }.bl };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered 3 at .<deref>.<dyn-downcast>, but expected something less or equal to 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-wide-ptr.rs:152:1
|
LL | const RAW_TRAIT_OBJ_VTABLE_NULL: *const dyn Trait = unsafe { DynTransmute { bad: BadDynRepr { ptr: &92, vtable: 0 } }.rust};
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling or unaligned vtable pointer in wide pointer or too small vtable
@ -135,7 +135,7 @@ LL | const RAW_TRAIT_OBJ_VTABLE_NULL: *const dyn Trait = unsafe { DynTransmute {
= 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-wide-ptr.rs:151:1
--> $DIR/ub-wide-ptr.rs:154:1
|
LL | const RAW_TRAIT_OBJ_VTABLE_INVALID: *const dyn Trait = unsafe { DynTransmute { repr2: DynRepr2 { ptr: &92, vtable: &3 } }.raw_rust};
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type validation failed: encountered dangling or unaligned vtable pointer in wide pointer or too small vtable