reflect, internal/reflectlite: embed reflectlite types into reflect types

src/reflect/swapper.go

@@ -1,40 +1,7 @@
 package reflect
 
-import "unsafe"
-
-// Some of code here has been copied from the Go sources:
-//   https://github.com/golang/go/blob/go1.15.2/src/reflect/swapper.go
-// It has the following copyright note:
-//
-// 		Copyright 2016 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.
+import "internal/reflectlite"
 
 func Swapper(slice interface{}) func(i, j int) {
-	v := ValueOf(slice)
-	if v.Kind() != Slice {
-		panic(&ValueError{Method: "Swapper"})
-	}
-
-	// Just return Nop func if nothing to swap.
-	if v.Len() < 2 {
-		return func(i, j int) {}
-	}
-
-	typ := v.typecode.Elem()
-	size := typ.Size()
-
-	header := (*sliceHeader)(v.value)
-	tmp := unsafe.Pointer(&make([]byte, size)[0])
-
-	return func(i, j int) {
-		if uint(i) >= uint(header.len) || uint(j) >= uint(header.len) {
-			panic("reflect: slice index out of range")
-		}
-		val1 := unsafe.Add(header.data, uintptr(i)*size)
-		val2 := unsafe.Add(header.data, uintptr(j)*size)
-		memcpy(tmp, val1, size)
-		memcpy(val1, val2, size)
-		memcpy(val2, tmp, size)
-	}
+	return reflectlite.Swapper(slice)
 }