How Can I Find the Implementation of Built-in Functions in Go?

Finding the Implementation of Built-In Functions

The question is about how to find the implementation of built-in functions in Go. It seems that the user has tried using godoc and IDE's jump-to-definition feature but could not locate the code.

The implementation of Go's built-in functions is written in a combination of Go and assembly. The code for the append() function, in particular, is generated by the compiler.

To see the code generating for append(), you can refer to the following location in the Go source code repository:

• https://github.com/golang/go/blob/go1.16.7/src/cmd/compile/internal/gc/ssa.go

The append() function uses another function called growslice, which is responsible for allocating a new slice and copying the existing elements into it. The implementation of growslice can be found here:

• https://github.com/golang/go/blob/go1.16.7/src/runtime/slice.go

By understanding how the compiler generates code for built-in functions like append(), you can gain a deeper understanding of the inner workings of the Go programming language.

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