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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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10
src/cmd/compile/internal/gc/inl.go
View file

@ -1072,7 +1072,7 @@ func mkinlcall(n, fn *Node, maxCost int32) *Node {
body := subst.list(asNodes(fn.Func.Inl.Body))
lab := nod(OLABEL, retlabel, nil)
lab := nodSym(OLABEL, nil, retlabel)
body = append(body, lab)
typecheckslice(body, Etop)
@ -1158,7 +1158,7 @@ func argvar(t *types.Type, i int) *Node {
// function call.
type inlsubst struct {
// Target of the goto substituted in place of a return.
retlabel *Node
retlabel *types.Sym
// Temporary result variables.
retvars []*Node
@ -1218,7 +1218,7 @@ func (subst *inlsubst) node(n *Node) *Node {
// dump("Return before substitution", n);
case ORETURN:
m := nod(OGOTO, subst.retlabel, nil)
m := nodSym(OGOTO, nil, subst.retlabel)
m.Ninit.Set(subst.list(n.Ninit))
if len(subst.retvars) != 0 && n.List.Len() != 0 {
@ -1245,8 +1245,8 @@ func (subst *inlsubst) node(n *Node) *Node {
m := n.copy()
m.Pos = subst.updatedPos(m.Pos)
m.Ninit.Set(nil)
p := fmt.Sprintf("%s·%d", n.Left.Sym.Name, inlgen)
m.Left = newname(lookup(p))
p := fmt.Sprintf("%s·%d", n.Sym.Name, inlgen)
m.Sym = lookup(p)
return m
}