What are Bodiless Functions in Go and How Do They Work?

Bodiless Functions in Go

While exploring the source code of the math/floor package, some code lines without a body may catch your attention. These are instances of bodiless functions, which are a peculiar feature of Go's syntax.

The function Floor, for example, is declared without a body starting at line 13:

In Go's syntax, a function declaration can omit the body. This allows for the definition of the function's signature while delegating its implementation to an external source, such as assembly code.

The actual implementation of bodiless functions can be found in assembly files, like floor_ARCH.s for the AMD64 architecture. As the specification states:

"A function declaration may omit the body. Such a declaration provides the signature for a function implemented outside Go, such as an assembly routine."

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