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[dev.typeparams] cmd/compile: remove CallExpr.PreserveClosure
This flag is only needed to prevent the directClosureCall optimization in walkCall, when called for walkGoDefer. But walkGoDefer don't need to call walkCall: at this point in the compile, the call expression isn't a real call anymore. Instead, we just need to walkExpr on the function expression. Change-Id: I8a5176cfe1bff53700cbd21ed1b479ebd9a839ad Reviewed-on: https://go-review.googlesource.com/c/go/+/330271 Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com> Trust: Matthew Dempsky <mdempsky@google.com>
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@ -157,13 +157,12 @@ const (
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type CallExpr struct {
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miniExpr
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origNode
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X Node
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Args Nodes
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KeepAlive []*Name // vars to be kept alive until call returns
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IsDDD bool
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Use CallUse
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NoInline bool
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PreserveClosure bool // disable directClosureCall for this call
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X Node
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Args Nodes
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KeepAlive []*Name // vars to be kept alive until call returns
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IsDDD bool
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Use CallUse
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NoInline bool
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}
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func NewCallExpr(pos src.XPos, op Op, fun Node, args []Node) *CallExpr {
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@ -37,14 +37,6 @@ func directClosureCall(n *ir.CallExpr) {
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return // leave for walkClosure to handle
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}
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// If wrapGoDefer() in the order phase has flagged this call,
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// avoid eliminating the closure even if there is a direct call to
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// (the closure is needed to simplify the register ABI). See
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// wrapGoDefer for more details.
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if n.PreserveClosure {
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return
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}
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// We are going to insert captured variables before input args.
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var params []*types.Field
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var decls []*ir.Name
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@ -1564,11 +1564,10 @@ func (o *orderState) wrapGoDefer(n *ir.GoDeferStmt) {
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// TODO: maybe not wrap if the called function has no arguments and
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// only in-register results?
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if len(callArgs) == 0 && call.Op() == ir.OCALLFUNC && callX.Type().NumResults() == 0 {
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if c, ok := call.(*ir.CallExpr); ok && callX != nil && callX.Op() == ir.OCLOSURE {
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if callX.Op() == ir.OCLOSURE {
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clo := callX.(*ir.ClosureExpr)
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clo.Func.SetClosureCalled(false)
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clo.IsGoWrap = true
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c.PreserveClosure = true
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}
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return
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}
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@ -1771,9 +1770,6 @@ func (o *orderState) wrapGoDefer(n *ir.GoDeferStmt) {
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topcall := ir.NewCallExpr(n.Pos(), ir.OCALL, clo, nil)
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typecheck.Call(topcall)
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// Tag the call to insure that directClosureCall doesn't undo our work.
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topcall.PreserveClosure = true
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fn.SetClosureCalled(false)
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// Finally, point the defer statement at the newly generated call.
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@ -204,7 +204,9 @@ func walkGoDefer(n *ir.GoDeferStmt) ir.Node {
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}
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var init ir.Nodes
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n.Call = walkExpr(n.Call, &init)
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call := n.Call.(*ir.CallExpr)
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call.X = walkExpr(call.X, &init)
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if len(init) > 0 {
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init.Append(n)
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