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cmd/compile/internal/gc: represent labels as bare Syms

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Avoids allocating an ONAME for OLABEL, OGOTO, and named OBREAK and
OCONTINUE nodes.

Passes toolstash-check.

Change-Id: I359142cd48e8987b5bf29ac100752f8c497261c1
Reviewed-on: https://go-review.googlesource.com/c/145200
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Matthew Dempsky 2018-10-26 20:10:23 -07:00
parent c68e3bcb03
commit 2dda040f19
11 changed files with 47 additions and 39 deletions
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8
src/cmd/compile/internal/gc/syntax.go
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@ -698,10 +698,10 @@ const (
// statements
OBLOCK // { List } (block of code)
OBREAK // break
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)
OCONTINUE // continue
OCONTINUE // continue [Sym]
ODEFER // defer Left (Left must be call)
OEMPTY // no-op (empty statement)
OFALL // fallthrough
@ -716,9 +716,9 @@ const (
// }
// OFORUNTIL is created by walk. There's no way to write this in Go code.
OFORUNTIL
OGOTO // goto Left
OGOTO // goto Sym
OIF // if Ninit; Left { Nbody } else { Rlist }
OLABEL // Left:
OLABEL // Sym:
OPROC // go Left (Left must be call)
ORANGE // for List = range Right { Nbody }
ORETURN // return List