Has the underlying structure of slice changed in Go 1.20? What new structure should be used to replace the previous reflect.SliceHeader?

Improvements to the underlying structure of Slice in Go 1.20

Go version 1.20 has made important adjustments to the underlying structure of Slice. The previous reflect.SliceHeader and reflect.StringHeader have been deprecated and are no longer recommended. This is because the new structure is designed safer and avoids potential errors in the garbage collection mechanism (GC).

Comments in the Go language source code illustrate this change:

 // deprecated: use unsafe.slice or unsafe.slicedata instead.
type sliceheader struct {
    ...
}

The new structure uses unsafe.pointer to replace the previous uintptr , which enhances security. The unsafe package of Go 1.20 has added three new functions: unsafe.SliceData , unsafe.String and unsafe.StringData , which provide a safer and more convenient way to create and manipulate Slice and String without relying on their internal representation details.

This improvement is also emphasized in the source code comments:

The unsafe package defines three new functions: SliceData , String , and StringData . Along with Go 1.17's Slice , these functions now provide the complete ability to construct and deconstruct slice and string values, without depending on their exact representation.

Regarding the limitations of searching codes in the official GitHub repository of Go, it may be due to search engine index update delays or search parameter settings.

In short, Go 1.20 improvements improve the security and ease of use of Slice and String. It is recommended that developers use new functions such as unsafe.SliceData to replace the old reflect.SliceHeader .

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