cmd/cloner: use maps.Clone and ptr.To

Updates #cleanup

Signed-off-by: Maisem Ali <maisem@tailscale.com>

cmd/cloner/cloner.go

@@ -126,8 +126,8 @@ func gen(buf *bytes.Buffer, it *codegen.ImportTracker, typ *types.Named) {
 				writef("for i := range dst.%s {", fname)
 				if ptr, isPtr := ft.Elem().(*types.Pointer); isPtr {
 					if _, isBasic := ptr.Elem().Underlying().(*types.Basic); isBasic {
-						writef("\tx := *src.%s[i]", fname)
-						writef("\tdst.%s[i] = &x", fname)
+						it.Import("tailscale.com/types/ptr")
+						writef("\tdst.%s[i] = ptr.To(*src.%s[i])", fname, fname)
 					} else {
 						writef("\tdst.%s[i] = src.%s[i].Clone()", fname, fname)
 					}
@@ -145,41 +145,41 @@ func gen(buf *bytes.Buffer, it *codegen.ImportTracker, typ *types.Named) {
 				writef("dst.%s = src.%s.Clone()", fname, fname)
 				continue
 			}
-			n := it.QualifiedName(ft.Elem())
+			it.Import("tailscale.com/types/ptr")
 			writef("if dst.%s != nil {", fname)
-			writef("\tdst.%s = new(%s)", fname, n)
-			writef("\t*dst.%s = *src.%s", fname, fname)
+			writef("\tdst.%s = ptr.To(*src.%s)", fname, fname)
 			if codegen.ContainsPointers(ft.Elem()) {
 				writef("\t" + `panic("TODO pointers in pointers")`)
 			}
 			writef("}")
 		case *types.Map:
 			elem := ft.Elem()
-			writef("if dst.%s != nil {", fname)
-			writef("\tdst.%s = map[%s]%s{}", fname, it.QualifiedName(ft.Key()), it.QualifiedName(elem))
 			if sliceType, isSlice := elem.(*types.Slice); isSlice {
 				n := it.QualifiedName(sliceType.Elem())
+				writef("if dst.%s != nil {", fname)
+				writef("\tdst.%s = map[%s]%s{}", fname, it.QualifiedName(ft.Key()), it.QualifiedName(elem))
 				writef("\tfor k := range src.%s {", fname)
 				// use zero-length slice instead of nil to ensure
 				// the key is always copied.
 				writef("\t\tdst.%s[k] = append([]%s{}, src.%s[k]...)", fname, n, fname)
 				writef("\t}")
+				writef("}")
 			} else if codegen.ContainsPointers(elem) {
+				writef("if dst.%s != nil {", fname)
+				writef("\tdst.%s = map[%s]%s{}", fname, it.QualifiedName(ft.Key()), it.QualifiedName(elem))
 				writef("\tfor k, v := range src.%s {", fname)
 				switch elem.(type) {
 				case *types.Pointer:
 					writef("\t\tdst.%s[k] = v.Clone()", fname)
 				default:
-					writef("\t\tv2 := v.Clone()")
-					writef("\t\tdst.%s[k] = *v2", fname)
+					writef("\t\tdst.%s[k] = *(v.Clone())", fname)
 				}
 				writef("\t}")
+				writef("}")
 			} else {
-				writef("\tfor k, v := range src.%s {", fname)
-				writef("\t\tdst.%s[k] = v", fname)
-				writef("\t}")
+				it.Import("maps")
+				writef("\tdst.%s = maps.Clone(src.%s)", fname, fname)
 			}
-			writef("}")
 		default:
 			writef(`panic("TODO: %s (%T)")`, fname, ft)
 		}

cmd/derper/depaware.txt

@@ -240,7 +240,7 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
         io/ioutil                                                    from github.com/mitchellh/go-ps+
         log                                                          from expvar+
         log/internal                                                 from log
-        maps                                                         from tailscale.com/types/views
+        maps                                                         from tailscale.com/types/views+
         math                                                         from compress/flate+
         math/big                                                     from crypto/dsa+
         math/bits                                                    from compress/flate+

cmd/tailscale/depaware.txt

@@ -256,7 +256,7 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
         io/ioutil                                                    from golang.org/x/sys/cpu+
         log                                                          from expvar+
         log/internal                                                 from log
-        maps                                                         from tailscale.com/types/views
+        maps                                                         from tailscale.com/types/views+
         math                                                         from compress/flate+
         math/big                                                     from crypto/dsa+
         math/bits                                                    from compress/flate+

cmd/tailscaled/depaware.txt

@@ -466,7 +466,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         log                                                          from expvar+
         log/internal                                                 from log
   LD    log/syslog                                                   from tailscale.com/ssh/tailssh
-        maps                                                         from tailscale.com/types/views
+        maps                                                         from tailscale.com/types/views+
         math                                                         from compress/flate+
         math/big                                                     from crypto/dsa+
         math/bits                                                    from compress/flate+

cmd/viewer/tests/tests_clone.go

@@ -6,7 +6,10 @@
 package tests
 
 import (
+	"maps"
 	"net/netip"
+
+	"tailscale.com/types/ptr"
 )
 
 // Clone makes a deep copy of StructWithPtrs.
@@ -18,12 +21,10 @@ func (src *StructWithPtrs) Clone() *StructWithPtrs {
 	dst := new(StructWithPtrs)
 	*dst = *src
 	if dst.Value != nil {
-		dst.Value = new(StructWithoutPtrs)
-		*dst.Value = *src.Value
+		dst.Value = ptr.To(*src.Value)
 	}
 	if dst.Int != nil {
-		dst.Int = new(int)
-		*dst.Int = *src.Int
+		dst.Int = ptr.To(*src.Int)
 	}
 	return dst
 }
@@ -60,12 +61,7 @@ func (src *Map) Clone() *Map {
 	}
 	dst := new(Map)
 	*dst = *src
-	if dst.Int != nil {
-		dst.Int = map[string]int{}
-		for k, v := range src.Int {
-			dst.Int[k] = v
-		}
-	}
+	dst.Int = maps.Clone(src.Int)
 	if dst.SliceInt != nil {
 		dst.SliceInt = map[string][]int{}
 		for k := range src.SliceInt {
@@ -84,12 +80,7 @@ func (src *Map) Clone() *Map {
 			dst.StructPtrWithoutPtr[k] = v.Clone()
 		}
 	}
-	if dst.StructWithoutPtr != nil {
-		dst.StructWithoutPtr = map[string]StructWithoutPtrs{}
-		for k, v := range src.StructWithoutPtr {
-			dst.StructWithoutPtr[k] = v
-		}
-	}
+	dst.StructWithoutPtr = maps.Clone(src.StructWithoutPtr)
 	if dst.SlicesWithPtrs != nil {
 		dst.SlicesWithPtrs = map[string][]*StructWithPtrs{}
 		for k := range src.SlicesWithPtrs {
@@ -102,35 +93,19 @@ func (src *Map) Clone() *Map {
 			dst.SlicesWithoutPtrs[k] = append([]*StructWithoutPtrs{}, src.SlicesWithoutPtrs[k]...)
 		}
 	}
-	if dst.StructWithoutPtrKey != nil {
-		dst.StructWithoutPtrKey = map[StructWithoutPtrs]int{}
-		for k, v := range src.StructWithoutPtrKey {
-			dst.StructWithoutPtrKey[k] = v
-		}
-	}
+	dst.StructWithoutPtrKey = maps.Clone(src.StructWithoutPtrKey)
 	if dst.SliceIntPtr != nil {
 		dst.SliceIntPtr = map[string][]*int{}
 		for k := range src.SliceIntPtr {
 			dst.SliceIntPtr[k] = append([]*int{}, src.SliceIntPtr[k]...)
 		}
 	}
-	if dst.PointerKey != nil {
-		dst.PointerKey = map[*string]int{}
-		for k, v := range src.PointerKey {
-			dst.PointerKey[k] = v
-		}
-	}
-	if dst.StructWithPtrKey != nil {
-		dst.StructWithPtrKey = map[StructWithPtrs]int{}
-		for k, v := range src.StructWithPtrKey {
-			dst.StructWithPtrKey[k] = v
-		}
-	}
+	dst.PointerKey = maps.Clone(src.PointerKey)
+	dst.StructWithPtrKey = maps.Clone(src.StructWithPtrKey)
 	if dst.StructWithPtr != nil {
 		dst.StructWithPtr = map[string]StructWithPtrs{}
 		for k, v := range src.StructWithPtr {
-			v2 := v.Clone()
-			dst.StructWithPtr[k] = *v2
+			dst.StructWithPtr[k] = *(v.Clone())
 		}
 	}
 	return dst
@@ -175,8 +150,7 @@ func (src *StructWithSlices) Clone() *StructWithSlices {
 	}
 	dst.Ints = make([]*int, len(src.Ints))
 	for i := range dst.Ints {
-		x := *src.Ints[i]
-		dst.Ints[i] = &x
+		dst.Ints[i] = ptr.To(*src.Ints[i])
 	}
 	dst.Slice = append(src.Slice[:0:0], src.Slice...)
 	dst.Prefixes = append(src.Prefixes[:0:0], src.Prefixes...)