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cmd/compile: remove OCASE and rename OXCASE to OCASE

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We used to use OXCASE to represent general, possibly multi-valued
cases, and then desugar these during walk into single-value cases
represented by OCASE.

In CL 194660, we switched to eliminated the desugaring step and
instead handle the multi-valued cases directly, which eliminates the
need for an OCASE Op. Instead, we can simply remove OCASE, and rename
OXCASE to just OCASE.

Passes toolstash-check.

Change-Id: I3cc184340f9081d37453927cca1c059267fdbc12
Reviewed-on: https://go-review.googlesource.com/c/go/+/196117
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Matthew Dempsky 2019-09-17 18:32:04 -07:00
parent 1b2c794896
commit 2fc6366fb5
11 changed files with 34 additions and 52 deletions
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8
src/cmd/compile/internal/gc/syntax.go
View file

@ -704,8 +704,8 @@ const (
// statements
OBLOCK // { List } (block of code)
OBREAK // break [Sym]
OCASE // case Left or List[0]..List[1]: Nbody (select case after processing; Left==nil and List==nil means default)
OXCASE // case List: Nbody (select case before processing; List==nil means default)
_ // For toolstash -cmp. TODO(mdempsky): Remove.
OCASE // case List: Nbody (List==nil means default)
OCONTINUE // continue [Sym]
ODEFER // defer Left (Left must be call)
OEMPTY // no-op (empty statement)
@ -727,8 +727,8 @@ const (
OGO // go Left (Left must be call)
ORANGE // for List = range Right { Nbody }
ORETURN // return List
OSELECT // select { List } (List is list of OXCASE or OCASE)
OSWITCH // switch Ninit; Left { List } (List is a list of OXCASE or OCASE)
OSELECT // select { List } (List is list of OCASE)
OSWITCH // switch Ninit; Left { List } (List is a list of OCASE)
OTYPESW // Left = Right.(type) (appears as .Left of OSWITCH)
// types