Where Is the Go 'make' Function Implemented?

Locating Built-In Function Implementations in Go's Source Code

The "make" function is a fundamental part of Go, but its source code location can be elusive. This article delves into where to find its implementation and guides you on how to independently navigate Go's source code in the future.

Locating the Make Implementation

The "make" function lacks a typical package source file. Instead, it undergoes a transformation during the Go compilation process:

• Symbolization: "make" is replaced with OMAKE, a compiler-specific symbol.
• Type Checking: OMAKE is transformed into OMAKECHAN, indicating a channel type creation.
• Code Generation: The OMAKECHAN symbol is replaced with "runtime·makechan" or "runtime·makechan64" in the generated code.

The actual implementation resides in the runtime package, specifically in either "makechan" or "makechan64" functions within "pkg/runtime."

How to Identify Function Implementations

To independently identify such implementations, consider these steps:

• Analyze the Compilation Stage: Determine the stage where the function implementation is likely to occur (e.g., compiler vs. runtime).
• Search the Source Tree: Use code search tools, or browse the source directories manually.
• Follow the Symbol Transformations: Trace the symbol transformations that the function undergoes during compilation.

By understanding these processes, you can effectively navigate Go's source code and discover the implementation of any function or feature.

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