Where Is the Implementation of Built-in Functions like append() in Go?

Finding the Implementation of Built-in Functions like append() in Go

In Go, built-in functions such as append() are essential building blocks for programming. However, it may not be immediately apparent where the implementation code for these functions resides. This article will guide you to locate the implementation of append() and other built-in functions.

The implementation code for built-in functions like append() is not directly exposed in the Go source code. However, you can utilize the following resources to delve into the internals:

• Source Code Generation:
  The code for append() is generated during compilation. You can access the generated intermediate code by running:

  go build -gcflags="-S"

This will create an assembly file (.s) containing the generated code for append() and other functions.

• Runtime Source Code:
  Various Go runtime functions are implemented in the runtime package. You can find the implementation of growslice(), which is utilized by append(), in:

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

• Compiler Source Code:
  The actual code that generates the append() implementation is in the Go compiler, specifically in:

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

By exploring these resources, you can delve into the inner workings of append() and other built-in functions in Go, gaining a deeper understanding of the language's implementation.

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