|author||Robert Findley <email@example.com>||Wed May 04 17:41:39 2022 -0400|
|committer||Heschi Kreinick <firstname.lastname@example.org>||Tue May 10 15:00:03 2022 +0000|
[release-branch.go1.18] go/types, types2: use a type lookup by identity in method lookup Named type identity is no longer canonical. For correctness, named types need to be compared with types.Identical. Our method set algorithm was not doing this: it was using a map to de-duplicate named types, relying on their pointer identity. As a result it was possible to get incorrect results or even infinite recursion, as encountered in #52715. To fix this, look up types by identity in NewMethodSet and LookupFieldOrMethod. This does a linear search among types with equal origin. Alternatively we could use a *Context to do a hash lookup, but in practice we will be considering a small number of types, and so performance is not a concern and a linear lookup is simpler. This also means we don't have to rely on our type hash being perfect, which we don't depend on elsewhere. Also add more tests for NewMethodSet and LookupFieldOrMethod involving generics. Fixes #52804 Change-Id: I04dfeff54347bc3544d95a30224c640ef448e9b7 Reviewed-on: https://go-review.googlesource.com/c/go/+/404099 TryBot-Result: Gopher Robot <email@example.com> Reviewed-by: Robert Griesemer <firstname.lastname@example.org> Run-TryBot: Robert Findley <email@example.com> (cherry picked from commit f088f4962e628992833444df7486d392715ea73d) Reviewed-on: https://go-review.googlesource.com/c/go/+/405117 Reviewed-by: Alan Donovan <firstname.lastname@example.org>
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