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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ir
import (
"cmd/internal/src"
)
// Copy returns a shallow copy of n.
func Copy(n Node) Node {
return n.copy()
}
// DeepCopy returns a “deep” copy of n, with its entire structure copied
// (except for shared nodes like ONAME, ONONAME, OLITERAL, and OTYPE).
// If pos.IsKnown(), it sets the source position of newly allocated Nodes to pos.
func DeepCopy(pos src.XPos, n Node) Node {
var edit func(Node) Node
edit = func(x Node) Node {
switch x.Op() {
case ONAME, ONONAME, OLITERAL, ONIL, OTYPE:
return x
}
x = Copy(x)
if pos.IsKnown() {
x.SetPos(pos)
}
EditChildren(x, edit)
return x
}
return edit(n)
}
// DeepCopyList returns a list of deep copies (using DeepCopy) of the nodes in list.
func DeepCopyList(pos src.XPos, list []Node) []Node {
var out []Node
for _, n := range list {
out = append(out, DeepCopy(pos, n))
}
return out
}
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