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[dev.regabi] cmd/compile: remove SetOp(OEMPTY) calls

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In preparation for OEMPTY being its own Node implementation,
remove SetOp(OEMPTY) calls that assume other implementations
can be turned into OEMPTY.

Passes buildall w/ toolstash -cmp.

Change-Id: Icac16d12548f35f52a5efa9d09dacf8260f42075
Reviewed-on: https://go-review.googlesource.com/c/go/+/274090
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Russ Cox 2020-11-28 00:54:58 -05:00
parent 171787efcd
commit b09dbc6913
3 changed files with 10 additions and 7 deletions
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5
src/cmd/compile/internal/gc/sinit.go
View file

@ -959,6 +959,9 @@ func anylit(n ir.Node, var_ ir.Node, init *ir.Nodes) {
}
}
// oaslit handles special composite literal assignments.
// It returns true if n's effects have been added to init,
// in which case n should be dropped from the program by the caller.
func oaslit(n ir.Node, init *ir.Nodes) bool {
if n.Left() == nil || n.Right() == nil {
// not a special composite literal assignment
@ -990,8 +993,6 @@ func oaslit(n ir.Node, init *ir.Nodes) bool {
anylit(n.Right(), n.Left(), init)
}
n.SetOp(ir.OEMPTY)
n.SetRight(nil)
return true
}

3
src/cmd/compile/internal/gc/typecheck.go
View file

@ -1985,8 +1985,7 @@ func typecheck1(n ir.Node, top int) (res ir.Node) {
// Empty identifier is valid but useless.
// Eliminate now to simplify life later.
// See issues 7538, 11589, 11593.
n.SetOp(ir.OEMPTY)
n.SetLeft(nil)
n = ir.NodAt(n.Pos(), ir.OEMPTY, nil, nil)
}
case ir.ODEFER:

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

@ -152,10 +152,12 @@ func walkstmt(n ir.Node) ir.Node {
init := n.Init()
n.PtrInit().Set(nil)
n = walkexpr(n, &init)
n = addinit(n, init.Slice())
if wascopy && n.Op() == ir.OCONVNOP {
n.SetOp(ir.OEMPTY) // don't leave plain values as statements.
if wascopy && n.Op() == ir.ONAME {
// copy rewrote to a statement list and a temp for the length.
// Throw away the temp to avoid plain values as statements.
n = ir.NodAt(n.Pos(), ir.OEMPTY, nil, nil)
}
n = addinit(n, init.Slice())
// special case for a receive where we throw away
// the value received.
@ -609,6 +611,7 @@ opswitch:
}
if oaslit(n, init) {
n = ir.NodAt(n.Pos(), ir.OEMPTY, nil, nil)
break
}