| commit | 95848fc5c64cde2e0fc95348a861e3cab98feaa7 | [log] [tgz] |
|---|---|---|
| author | Cherry Zhang <cherryyz@google.com> | Mon Jun 08 18:38:59 2020 -0400 |
| committer | Cherry Zhang <cherryyz@google.com> | Thu Jun 11 22:32:49 2020 +0000 |
| tree | e8007638bbd2a336045c338c326e596f9f29ed9a | |
| parent | 3187b05b87e39231202bf2a9bf89905649472b6c [diff] |
[dev.link] cmd/compile, cmd/link: remove dead methods if type is not used in interface Currently, a method of a reachable type is live if it matches a method of a reachable interface. In fact, we only need to retain the method if the type is actually converted to an interface. If the type is never converted to an interface, there is no way to call the method through an interface method call (but the type descriptor could still be used, e.g. in calling runtime.newobject). A type can be used in an interface in two ways: - directly converted to interface. (Any interface counts, as it is possible to convert one interface to another.) - obtained by reflection from a related type (e.g. obtaining an interface of T from []T). For the former, we let the compiler emit a marker on the type descriptor symbol when it is converted to an interface. In the linker, we only need to check methods of marked types. For the latter, when the linker visits a marked type, it needs to visit all its "child" types as marked (i.e. potentially could be converted to interface). This reduces binary size: cmd/compile 18792016 18706096 (-0.5%) cmd/go 14120572 13398948 (-5.1%) Change-Id: I4465c7eeabf575f4dc84017214c610fa05ae31fd Reviewed-on: https://go-review.googlesource.com/c/go/+/237298 Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Than McIntosh <thanm@google.com> Reviewed-by: Jeremy Faller <jeremy@golang.org>
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