debug/elf: add (*File).DynValue

[florinpapa]

DynString currently offers functionality to retrieve only string-valued .dynamic entries (e.g. entries described here as "string table offset of..."). However, many of them do not correspond to entries in the string table, and it would be useful to be able to extract those values too (e.g. to determine whether a binary is a PIE via the DF_1_PIE flag).

[gopherbot]

Change https://go.dev/cl/452617 mentions this issue: debug/elf: retrieve values for dynamic section tags

[seankhliao]

what does the proposed API change look like?

[ianlancetaylor]

From the CL, it appears that the proposal is

// DynValue returns the values listed for the given tag in the file's dynamic
// section.
func (f *File) DynValue(tag DynTag) ([]uint64, error)

[florinpapa]

Right, thank you. I missed the message from Nov 22nd.

[rsc]

This proposal has been added to the active column of the proposals project
and will now be reviewed at the weekly proposal review meetings.
— rsc for the proposal review group

[rsc]

This seems completely reasonable and I don't see any objections.

[rsc]

Based on the discussion above, this proposal seems like a likely accept.
— rsc for the proposal review group

[rsc]

No change in consensus, so accepted. 🎉
This issue now tracks the work of implementing the proposal.
— rsc for the proposal review group

[gopherbot]

Change https://go.dev/cl/499616 mentions this issue: doc/go1.21: mention debug/elf changes