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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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9
src/cmd/compile/internal/gc/swt.go
View file

@ -421,7 +421,8 @@ func casebody(sw *Node, typeswvar *Node) {
n.Op = OCASE
needvar := n.List.Len() != 1 || n.List.First().Op == OLITERAL
jmp := nod(OGOTO, autolabel(".s"), nil)
lbl := autolabel(".s")
jmp := nodSym(OGOTO, nil, lbl)
switch n.List.Len() {
case 0:
// default
@ -486,7 +487,7 @@ func casebody(sw *Node, typeswvar *Node) {
}
}
stat = append(stat, nod(OLABEL, jmp.Left, nil))
stat = append(stat, nodSym(OLABEL, nil, lbl))
if typeswvar != nil && needvar && n.Rlist.Len() != 0 {
l := []*Node{
nod(ODCL, n.Rlist.First(), nil),
@ -778,10 +779,10 @@ func (s *typeSwitch) walk(sw *Node) {
} else {
// Jump to default case.
lbl := autolabel(".s")
i.Nbody.Set1(nod(OGOTO, lbl, nil))
i.Nbody.Set1(nodSym(OGOTO, nil, lbl))
// Wrap default case with label.
blk := nod(OBLOCK, nil, nil)
blk.List.Set2(nod(OLABEL, lbl, nil), def)
blk.List.Set2(nodSym(OLABEL, nil, lbl), def)
def = blk
}
i.Left = typecheck(i.Left, Erv)