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adjust for current reality wrt. wide raw pointers #162

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merged 10 commits into from
Sep 12, 2019
Merged

adjust for current reality wrt. wide raw pointers #162

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5e082af
adjust for current reality wrt. wide raw pointers
RalfJung Aug 25, 2019
9cf4a9a
clarify, also cover Box
RalfJung Aug 25, 2019
61b001f
Oxford
RalfJung Aug 25, 2019
8db5ad1
fix slice wide ptr metadata
RalfJung Aug 26, 2019
78c2473
note on not-too-large slices
RalfJung Aug 26, 2019
5287c52
fix noun
RalfJung Aug 26, 2019
c6bf198
adjust fn unwinding clause to match reference
RalfJung Aug 27, 2019
d3a5f5b
impove wording
RalfJung Aug 27, 2019
04823fd
use agreed-upon wording
RalfJung Sep 9, 2019
d176807
Update src/what-unsafe-does.md
RalfJung Sep 11, 2019
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7 changes: 3 additions & 4 deletions src/what-unsafe-does.md
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Expand Up @@ -16,8 +16,7 @@ to your program. You definitely *should not* invoke Undefined Behavior.
Unlike C, Undefined Behavior is pretty limited in scope in Rust. All the core
language cares about is preventing the following things:

* Dereferencing (using the `*` operator on) dangling, or unaligned pointers, or
wide pointers with invalid metadata (see below)
* Dereferencing (using the `*` operator on) dangling or unaligned pointers (see below)
* Breaking the [pointer aliasing rules][]
* Unwinding into another language
* Causing a [data race][race]
Expand All @@ -30,8 +29,8 @@ language cares about is preventing the following things:
* a null `fn` pointer
* a `char` outside the ranges [0x0, 0xD7FF] and [0xE000, 0x10FFFF]
* a `!` (all values are invalid for this type)
* a reference that is dangling, unaligned, points to an invalid value, or
that has invalid metadata (if wide)
* a reference/`Box` that is dangling, unaligned, or points to an invalid value.
* a wide reference, `Box` or raw pointer that has invalid metadata:
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* slice metadata is invalid if the slice has a total size larger than
`isize::MAX` bytes in memory
* `dyn Trait` metadata is invalid if it is not a pointer to a vtable for
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