From 5f27a25cf4eab09e70cdf81f5e548f13fa7fc289 Mon Sep 17 00:00:00 2001 From: Patrick McCarter Date: Fri, 22 Feb 2019 15:49:07 -0500 Subject: [PATCH] Invalid byte alignment expected/provided in message #58617 --- src/librustc_mir/interpret/validity.rs | 6 ++++-- src/test/ui/consts/const-eval/ub-ref.rs | 1 + src/test/ui/consts/const-eval/ub-ref.stderr | 10 +++++----- 3 files changed, 10 insertions(+), 7 deletions(-) diff --git a/src/librustc_mir/interpret/validity.rs b/src/librustc_mir/interpret/validity.rs index 8b97d9ded74..91a43d5c991 100644 --- a/src/librustc_mir/interpret/validity.rs +++ b/src/librustc_mir/interpret/validity.rs @@ -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 \ diff --git a/src/test/ui/consts/const-eval/ub-ref.rs b/src/test/ui/consts/const-eval/ub-ref.rs index 3b19f3b0775..26dd2520a15 100644 --- a/src/test/ui/consts/const-eval/ub-ref.rs +++ b/src/test/ui/consts/const-eval/ub-ref.rs @@ -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 diff --git a/src/test/ui/consts/const-eval/ub-ref.stderr b/src/test/ui/consts/const-eval/ub-ref.stderr index f8b5b2f50ce..254561c81e1 100644 --- a/src/test/ui/consts/const-eval/ub-ref.stderr +++ b/src/test/ui/consts/const-eval/ub-ref.stderr @@ -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 ., 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