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add const test for ptr::metadata
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@RalfJung
RalfJung committed Feb 29, 2024
1 parent 384d26f commit 3ed175c
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Showing 2 changed files with 36 additions and 33 deletions.
5 changes: 4 additions & 1 deletion tests/ui/consts/const-eval/ub-wide-ptr.rs
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Original file line number Diff line number Diff line change
@@ -1,7 +1,8 @@
// ignore-tidy-linelength
#![allow(unused)]
#![feature(ptr_metadata)]

use std::mem;
use std::{ptr, mem};

// Strip out raw byte dumps to make comparison platform-independent:
//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
Expand Down Expand Up @@ -145,6 +146,8 @@ const RAW_TRAIT_OBJ_VTABLE_NULL: *const dyn Trait = unsafe { mem::transmute((&92
const RAW_TRAIT_OBJ_VTABLE_INVALID: *const dyn Trait = unsafe { mem::transmute((&92u8, &3u64)) };
//~^ ERROR it is undefined behavior to use this value
const RAW_TRAIT_OBJ_CONTENT_INVALID: *const dyn Trait = unsafe { mem::transmute::<_, &bool>(&3u8) } as *const dyn Trait; // ok because raw
// Officially blessed way to get the vtable
const DYN_METADATA: ptr::DynMetadata<dyn Send> = ptr::metadata::<dyn Send>(ptr::null::<i32>());

// Const eval fails for these, so they need to be statics to error.
static mut RAW_TRAIT_OBJ_VTABLE_NULL_THROUGH_REF: *const dyn Trait = unsafe {
Expand Down
64 changes: 32 additions & 32 deletions tests/ui/consts/const-eval/ub-wide-ptr.stderr
View file
Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:38:1
--> $DIR/ub-wide-ptr.rs:39:1
|
LL | const STR_TOO_LONG: &str = unsafe { mem::transmute((&42u8, 999usize)) };
| ^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered a dangling reference (going beyond the bounds of its allocation)
Expand All @@ -10,7 +10,7 @@ LL | const STR_TOO_LONG: &str = unsafe { mem::transmute((&42u8, 999usize)) };
}

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:40:1
--> $DIR/ub-wide-ptr.rs:41:1
|
LL | const NESTED_STR_MUCH_TOO_LONG: (&str,) = (unsafe { mem::transmute((&42, usize::MAX)) },);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value at .0: encountered invalid reference metadata: slice is bigger than largest supported object
Expand All @@ -21,7 +21,7 @@ LL | const NESTED_STR_MUCH_TOO_LONG: (&str,) = (unsafe { mem::transmute((&42, us
}

error[E0080]: evaluation of constant value failed
--> $DIR/ub-wide-ptr.rs:43:1
--> $DIR/ub-wide-ptr.rs:44:1
|
LL | const STR_LENGTH_PTR: &str = unsafe { mem::transmute((&42u8, &3)) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ unable to turn pointer into integer
Expand All @@ -30,7 +30,7 @@ LL | const STR_LENGTH_PTR: &str = unsafe { mem::transmute((&42u8, &3)) };
= help: the absolute address of a pointer is not known at compile-time, so such operations are not supported

error[E0080]: evaluation of constant value failed
--> $DIR/ub-wide-ptr.rs:46:1
--> $DIR/ub-wide-ptr.rs:47:1
|
LL | const MY_STR_LENGTH_PTR: &MyStr = unsafe { mem::transmute((&42u8, &3)) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unable to turn pointer into integer
Expand All @@ -39,7 +39,7 @@ LL | const MY_STR_LENGTH_PTR: &MyStr = unsafe { mem::transmute((&42u8, &3)) };
= help: the absolute address of a pointer is not known at compile-time, so such operations are not supported

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:48:1
--> $DIR/ub-wide-ptr.rs:49:1
|
LL | const MY_STR_MUCH_TOO_LONG: &MyStr = unsafe { mem::transmute((&42u8, usize::MAX)) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered invalid reference metadata: slice is bigger than largest supported object
Expand All @@ -50,7 +50,7 @@ LL | const MY_STR_MUCH_TOO_LONG: &MyStr = unsafe { mem::transmute((&42u8, usize:
}

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:52:1
--> $DIR/ub-wide-ptr.rs:53:1
|
LL | const STR_NO_INIT: &str = unsafe { mem::transmute::<&[_], _>(&[MaybeUninit::<u8> { uninit: () }]) };
| ^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value at .<deref>: encountered uninitialized memory, but expected a string
Expand All @@ -61,7 +61,7 @@ LL | const STR_NO_INIT: &str = unsafe { mem::transmute::<&[_], _>(&[MaybeUninit:
}

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:55:1
--> $DIR/ub-wide-ptr.rs:56:1
|
LL | const MYSTR_NO_INIT: &MyStr = unsafe { mem::transmute::<&[_], _>(&[MaybeUninit::<u8> { uninit: () }]) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value at .<deref>.0: encountered uninitialized memory, but expected a string
Expand All @@ -72,13 +72,13 @@ LL | const MYSTR_NO_INIT: &MyStr = unsafe { mem::transmute::<&[_], _>(&[MaybeUni
}

error[E0080]: evaluation of constant value failed
--> $DIR/ub-wide-ptr.rs:62:1
--> $DIR/ub-wide-ptr.rs:63:1
|
LL | const SLICE_LENGTH_UNINIT: &[u8] = unsafe {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ using uninitialized data, but this operation requires initialized memory

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:69:1
--> $DIR/ub-wide-ptr.rs:70:1
|
LL | const SLICE_TOO_LONG: &[u8] = unsafe { mem::transmute((&42u8, 999usize)) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered a dangling reference (going beyond the bounds of its allocation)
Expand All @@ -89,7 +89,7 @@ LL | const SLICE_TOO_LONG: &[u8] = unsafe { mem::transmute((&42u8, 999usize)) };
}

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:72:1
--> $DIR/ub-wide-ptr.rs:73:1
|
LL | const SLICE_TOO_LONG_OVERFLOW: &[u32] = unsafe { mem::transmute((&42u32, isize::MAX)) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered invalid reference metadata: slice is bigger than largest supported object
Expand All @@ -100,7 +100,7 @@ LL | const SLICE_TOO_LONG_OVERFLOW: &[u32] = unsafe { mem::transmute((&42u32, is
}

error[E0080]: evaluation of constant value failed
--> $DIR/ub-wide-ptr.rs:75:1
--> $DIR/ub-wide-ptr.rs:76:1
|
LL | const SLICE_LENGTH_PTR: &[u8] = unsafe { mem::transmute((&42u8, &3)) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unable to turn pointer into integer
Expand All @@ -109,7 +109,7 @@ LL | const SLICE_LENGTH_PTR: &[u8] = unsafe { mem::transmute((&42u8, &3)) };
= help: the absolute address of a pointer is not known at compile-time, so such operations are not supported

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:78:1
--> $DIR/ub-wide-ptr.rs:79:1
|
LL | const SLICE_TOO_LONG_BOX: Box<[u8]> = unsafe { mem::transmute((&42u8, 999usize)) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered a dangling box (going beyond the bounds of its allocation)
Expand All @@ -120,7 +120,7 @@ LL | const SLICE_TOO_LONG_BOX: Box<[u8]> = unsafe { mem::transmute((&42u8, 999us
}

error[E0080]: evaluation of constant value failed
--> $DIR/ub-wide-ptr.rs:81:1
--> $DIR/ub-wide-ptr.rs:82:1
|
LL | const SLICE_LENGTH_PTR_BOX: Box<[u8]> = unsafe { mem::transmute((&42u8, &3)) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unable to turn pointer into integer
Expand All @@ -129,7 +129,7 @@ LL | const SLICE_LENGTH_PTR_BOX: Box<[u8]> = unsafe { mem::transmute((&42u8, &3)
= help: the absolute address of a pointer is not known at compile-time, so such operations are not supported

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:85:1
--> $DIR/ub-wide-ptr.rs:86:1
|
LL | const SLICE_CONTENT_INVALID: &[bool] = &[unsafe { mem::transmute(3u8) }];
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value at .<deref>[0]: encountered 0x03, but expected a boolean
Expand All @@ -140,13 +140,13 @@ LL | const SLICE_CONTENT_INVALID: &[bool] = &[unsafe { mem::transmute(3u8) }];
}

note: erroneous constant encountered
--> $DIR/ub-wide-ptr.rs:85:40
--> $DIR/ub-wide-ptr.rs:86:40
|
LL | const SLICE_CONTENT_INVALID: &[bool] = &[unsafe { mem::transmute(3u8) }];
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:92:1
--> $DIR/ub-wide-ptr.rs:93:1
|
LL | const MYSLICE_PREFIX_BAD: &MySliceBool = &MySlice(unsafe { mem::transmute(3u8) }, [false]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value at .<deref>.0: encountered 0x03, but expected a boolean
Expand All @@ -157,13 +157,13 @@ LL | const MYSLICE_PREFIX_BAD: &MySliceBool = &MySlice(unsafe { mem::transmute(3
}

note: erroneous constant encountered
--> $DIR/ub-wide-ptr.rs:92:42
--> $DIR/ub-wide-ptr.rs:93:42
|
LL | const MYSLICE_PREFIX_BAD: &MySliceBool = &MySlice(unsafe { mem::transmute(3u8) }, [false]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:96:1
--> $DIR/ub-wide-ptr.rs:97:1
|
LL | const MYSLICE_SUFFIX_BAD: &MySliceBool = &MySlice(true, [unsafe { mem::transmute(3u8) }]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value at .<deref>.1[0]: encountered 0x03, but expected a boolean
Expand All @@ -174,19 +174,19 @@ LL | const MYSLICE_SUFFIX_BAD: &MySliceBool = &MySlice(true, [unsafe { mem::tran
}

note: erroneous constant encountered
--> $DIR/ub-wide-ptr.rs:96:42
--> $DIR/ub-wide-ptr.rs:97:42
|
LL | const MYSLICE_SUFFIX_BAD: &MySliceBool = &MySlice(true, [unsafe { mem::transmute(3u8) }]);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0080]: evaluation of constant value failed
--> $DIR/ub-wide-ptr.rs:104:1
--> $DIR/ub-wide-ptr.rs:105:1
|
LL | const RAW_SLICE_LENGTH_UNINIT: *const [u8] = unsafe {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ using uninitialized data, but this operation requires initialized memory

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:113:1
--> $DIR/ub-wide-ptr.rs:114:1
|
LL | const TRAIT_OBJ_SHORT_VTABLE_1: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, &3u8))) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value at .0: encountered ALLOC12<imm>, but expected a vtable pointer
Expand All @@ -197,7 +197,7 @@ LL | const TRAIT_OBJ_SHORT_VTABLE_1: W<&dyn Trait> = unsafe { mem::transmute(W((
}

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:117:1
--> $DIR/ub-wide-ptr.rs:118:1
|
LL | const TRAIT_OBJ_SHORT_VTABLE_2: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, &3u64))) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value at .0: encountered ALLOC14<imm>, but expected a vtable pointer
Expand All @@ -208,7 +208,7 @@ LL | const TRAIT_OBJ_SHORT_VTABLE_2: W<&dyn Trait> = unsafe { mem::transmute(W((
}

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:121:1
--> $DIR/ub-wide-ptr.rs:122:1
|
LL | const TRAIT_OBJ_INT_VTABLE: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, 4usize))) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value at .0: encountered 0x4[noalloc], but expected a vtable pointer
Expand All @@ -219,7 +219,7 @@ LL | const TRAIT_OBJ_INT_VTABLE: W<&dyn Trait> = unsafe { mem::transmute(W((&92u
}

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:124:1
--> $DIR/ub-wide-ptr.rs:125:1
|
LL | const TRAIT_OBJ_UNALIGNED_VTABLE: &dyn Trait = unsafe { mem::transmute((&92u8, &[0u8; 128])) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered ALLOC17<imm>, but expected a vtable pointer
Expand All @@ -230,7 +230,7 @@ LL | const TRAIT_OBJ_UNALIGNED_VTABLE: &dyn Trait = unsafe { mem::transmute((&92
}

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:127:1
--> $DIR/ub-wide-ptr.rs:128:1
|
LL | const TRAIT_OBJ_BAD_DROP_FN_NULL: &dyn Trait = unsafe { mem::transmute((&92u8, &[0usize; 8])) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered ALLOC19<imm>, but expected a vtable pointer
Expand All @@ -241,7 +241,7 @@ LL | const TRAIT_OBJ_BAD_DROP_FN_NULL: &dyn Trait = unsafe { mem::transmute((&92
}

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:130:1
--> $DIR/ub-wide-ptr.rs:131:1
|
LL | const TRAIT_OBJ_BAD_DROP_FN_INT: &dyn Trait = unsafe { mem::transmute((&92u8, &[1usize; 8])) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered ALLOC21<imm>, but expected a vtable pointer
Expand All @@ -252,7 +252,7 @@ LL | const TRAIT_OBJ_BAD_DROP_FN_INT: &dyn Trait = unsafe { mem::transmute((&92u
}

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:133:1
--> $DIR/ub-wide-ptr.rs:134:1
|
LL | const TRAIT_OBJ_BAD_DROP_FN_NOT_FN_PTR: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, &[&42u8; 8]))) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value at .0: encountered ALLOC23<imm>, but expected a vtable pointer
Expand All @@ -263,7 +263,7 @@ LL | const TRAIT_OBJ_BAD_DROP_FN_NOT_FN_PTR: W<&dyn Trait> = unsafe { mem::trans
}

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:138:1
--> $DIR/ub-wide-ptr.rs:139:1
|
LL | const TRAIT_OBJ_CONTENT_INVALID: &dyn Trait = unsafe { mem::transmute::<_, &bool>(&3u8) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value at .<deref>.<dyn-downcast>: encountered 0x03, but expected a boolean
Expand All @@ -274,7 +274,7 @@ LL | const TRAIT_OBJ_CONTENT_INVALID: &dyn Trait = unsafe { mem::transmute::<_,
}

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:143:1
--> $DIR/ub-wide-ptr.rs:144:1
|
LL | const RAW_TRAIT_OBJ_VTABLE_NULL: *const dyn Trait = unsafe { mem::transmute((&92u8, 0usize)) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered null pointer, but expected a vtable pointer
Expand All @@ -285,7 +285,7 @@ LL | const RAW_TRAIT_OBJ_VTABLE_NULL: *const dyn Trait = unsafe { mem::transmute
}

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:145:1
--> $DIR/ub-wide-ptr.rs:146:1
|
LL | const RAW_TRAIT_OBJ_VTABLE_INVALID: *const dyn Trait = unsafe { mem::transmute((&92u8, &3u64)) };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered ALLOC28<imm>, but expected a vtable pointer
Expand All @@ -296,7 +296,7 @@ LL | const RAW_TRAIT_OBJ_VTABLE_INVALID: *const dyn Trait = unsafe { mem::transm
}

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:150:1
--> $DIR/ub-wide-ptr.rs:153:1
|
LL | static mut RAW_TRAIT_OBJ_VTABLE_NULL_THROUGH_REF: *const dyn Trait = unsafe {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered null pointer, but expected a vtable pointer
Expand All @@ -307,7 +307,7 @@ LL | static mut RAW_TRAIT_OBJ_VTABLE_NULL_THROUGH_REF: *const dyn Trait = unsafe
}

error[E0080]: it is undefined behavior to use this value
--> $DIR/ub-wide-ptr.rs:154:1
--> $DIR/ub-wide-ptr.rs:157:1
|
LL | static mut RAW_TRAIT_OBJ_VTABLE_INVALID_THROUGH_REF: *const dyn Trait = unsafe {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ constructing invalid value: encountered ALLOC31<imm>, but expected a vtable pointer
Expand Down

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