tree a84347580016364b37397fbbf28e0f4e97d99a73
parent eca96e39cb895805b617e0e1f184f893ed3e46bb
author Ian Lance Taylor <iant@golang.org> 1608663875 -0800
committer Ian Lance Taylor <iant@golang.org> 1608676896 +0000

runtime: eliminate scase.kind field

This is the gofrontend version of https://golang.org/cl/245125.

Original CL description:

    Currently, we include a "kind" field on scase to distinguish the three
    kinds of cases in a select statement: sends, receives, and defaults.

    This commit removes by kind field by instead arranging for the
    compiler to always place sends before receives, and to provide their
    counts separately. It also passes an explicit "block bool" parameter
    to avoid needing to include a default case in the array.

    It's safe to shuffle cases like this because the runtime will
    randomize the order they're polled in anyway.

    For golang/go#40410.

This is being brought over to gofrontend as a step toward upgrading to
Go1.16beta1.

Change-Id: I39a0a83c25e15fbd3cdfac7f31e01df9f2cddd3f
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/279735
Trust: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>