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d52ae45e9b
The cloner's codegen for map[K][]*V fields was doing a shallow append (copying pointer values) instead of cloning each element. This meant that cloned structs aliased the original's pointed-to values through the map's slice entries. Mirror the existing standalone-slice logic that checks ContainsPointers(sliceType.Elem()) and generates per-element cloning for pointer, interface, and struct types. Regenerate net/dns and tailcfg which both had affected map[...][]*dnstype.Resolver fields. Fixes #19284 Signed-off-by: Andrew Dunham <andrew@tailscale.com>
75 lines
2.0 KiB
Go
75 lines
2.0 KiB
Go
// Copyright (c) Tailscale Inc & contributors
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// SPDX-License-Identifier: BSD-3-Clause
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//go:generate go run tailscale.com/cmd/cloner -clonefunc=true -type SliceContainer,InterfaceContainer,MapWithPointers,DeeplyNestedMap,NamedMapContainer,MapSlicePointerContainer
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// Package clonerex is an example package for the cloner tool.
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package clonerex
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type SliceContainer struct {
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Slice []*int
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}
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// Cloneable is an interface with a Clone method.
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type Cloneable interface {
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Clone() Cloneable
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}
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// CloneableImpl is a concrete type that implements Cloneable.
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type CloneableImpl struct {
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Value int
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}
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func (c *CloneableImpl) Clone() Cloneable {
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if c == nil {
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return nil
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}
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return &CloneableImpl{Value: c.Value}
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}
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// InterfaceContainer has a pointer to an interface field, which tests
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// the special handling for interface types in the cloner.
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type InterfaceContainer struct {
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Interface Cloneable
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}
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type MapWithPointers struct {
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Nested map[string]*int
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WithCloneMethod map[string]*SliceContainer
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CloneInterface map[string]Cloneable
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}
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// NamedMap is a named map type with its own Clone method.
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// This tests that the cloner uses the type's Clone method
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// rather than trying to descend into the map's value type.
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type NamedMap map[string]any
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func (m NamedMap) Clone() NamedMap {
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if m == nil {
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return nil
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}
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m2 := make(NamedMap, len(m))
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for k, v := range m {
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m2[k] = v
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}
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return m2
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}
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// NamedMapContainer has a field whose type is a named map with a Clone method.
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type NamedMapContainer struct {
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Attrs NamedMap
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}
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// MapSlicePointerContainer has a map whose values are slices of pointers.
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// This tests that the cloner deep-clones the pointer elements in the slice,
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// not just the slice itself (which would leave aliased pointers).
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type MapSlicePointerContainer struct {
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Routes map[string][]*SliceContainer
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}
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// DeeplyNestedMap tests arbitrary depth of map nesting (3+ levels)
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type DeeplyNestedMap struct {
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ThreeLevels map[string]map[string]map[string]int
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FourLevels map[string]map[string]map[string]map[string]*SliceContainer
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}
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