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update UB #659

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Merged
merged 16 commits into from
Sep 5, 2019
Merged

update UB #659

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a64e5d9
update UB
RalfJung Aug 25, 2019
6a6b017
fix slice metadata
RalfJung Aug 26, 2019
a93e37a
Apply suggestions from code review
RalfJung Aug 26, 2019
90251b3
tweaks
RalfJung Aug 26, 2019
e8303be
let is too specific
RalfJung Aug 26, 2019
7b76cc3
make it more clear that the uninit-mem clause is type-driven
RalfJung Aug 26, 2019
5c7362c
note rustc-specific details
RalfJung Aug 27, 2019
1fc9b11
avoid two notes right next to each other
RalfJung Aug 27, 2019
ccf3d7a
typo
RalfJung Aug 27, 2019
f10ed4b
move libstd concerns out of the rustc note
RalfJung Aug 27, 2019
c9e23d1
generalize from uwnind ABI
RalfJung Aug 27, 2019
ad60b7a
more concise note
RalfJung Aug 27, 2019
3c18f69
clarify
RalfJung Aug 27, 2019
8043278
sync with nomicon
RalfJung Aug 27, 2019
6e17582
update immutability rule
RalfJung Aug 29, 2019
6c9a399
Apply suggestions from code review
RalfJung Aug 29, 2019
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move libstd concerns out of the rustc note
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@RalfJung
RalfJung committed Aug 27, 2019
commit f10ed4b986c6b05bdb5b341ad321bb1ad8736e4f
5 changes: 3 additions & 2 deletions src/behavior-considered-undefined.md
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Expand Up @@ -53,9 +53,10 @@ code.
(i.e., it must not be read from uninitialized memory).
* Non-UTF-8 byte sequences in a `str`.
* Invalid values for a type with a custom definition of invalid values.
In the standard library, this affects [`NonNull<T>`] and [`NonZero*`].

> **Note**: For `rustc`, those types are [`NonNull<T>`] and [`NonZero*`].
> Requesting custom invalid values requires the unstable `rustc_layout_scalar_valid_range_*` attributes.
> **Note**: For `rustc`, requesting custom invalid values requires the
> unstable `rustc_layout_scalar_valid_range_*` attributes.

A reference/pointer is "dangling" if it is null or not all of the bytes it
points to are part of the same allocation (so in particular they all have to be
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