How can I find the implementation of built-in functions like append() in Go?

Finding the Implementation of Built-in Functions

It can be frustrating when you cannot find the implementation code for built-in functions, such as append() in Go. Unlike user-defined functions, built-in functions are not defined in source code files that you can access. Here's how you can find the implementation:

The implementation of append() and other built-in functions is embedded directly in the Go compiler, gc. To view the code for append(), you can inspect the source code of the compiler itself:

1. Locate the Go compiler source code:

   • Clone the Go repository from GitHub: git clone https://github.com/golang/go
   • Navigate to the compiler directory: cd src/cmd/compile

2. Find the relevant file:

   • In the compiler source code, look for the file ssa.go.
   • Search within this file for "append".

3. Inspect the code:

   • The implementation of append() is found in the func ssagenblock() function around line 1450.

Additionally, the growslice() function, which is used by append(), is located in the runtime/slice.go file:

1. Locate the Go runtime source code:

   • Navigate to the runtime directory: cd src/runtime

2. Find the relevant file:

   • Search for the file slice.go.
   • Search within this file for "growslice".

By inspecting the source code of the compiler and runtime, you can gain insights into the implementation details of built-in functions.

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