document preservation of padding in operations on pointers#695
Open
document preservation of padding in operations on pointers#695
Conversation
kirtchev-adacore
requested changes
Apr 21, 2026
| The representation of the value of a :t:`constant initializer` or :t:`static initializer` must only contain bytes with :t:`provenance` where all bytes of some original :t:`pointer` are in the correct order. | ||
|
|
||
| :dp:`fls_nwgIMLkvD2Ol` | ||
| :dt:`Provenance` is the memory that a :t:`pointer` has permission to access, the timespan during which it can acesss that memory, and if it can access the memory for writes. |
Contributor
There was a problem hiding this comment.
Where did you get this definition from? To me, "provenance" is a property (of something, TBD). According to Merriam-Webster, "provenance" is the origin or source, or the history of ownership.
Member
Author
There was a problem hiding this comment.
https://doc.rust-lang.org/stable/core/ptr/index.html#provenance
maybe I should just call it pointer provenance
Co-authored-by: Hristian Kirtchev <60669983+kirtchev-adacore@users.noreply.github.com>
Co-authored-by: Hristian Kirtchev <60669983+kirtchev-adacore@users.noreply.github.com>
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
This is as far as I "understand" these things, and is based on these 2 PRs