How Does Go's `make()` Function Work at the Compiler Level?

Unveiling the Inner Workings of make() in Go

The make() function is a crucial component of Go's standard library, providing the capability to create channels, slices, and maps. However, unlike other packages, finding the source code implementation of make() requires a deeper exploration.

Delving into the Compiler Magic

Contrary to expectations, make() doesn't have a direct implementation in the Go source code. Instead, its functionality is implemented at the compiler level. Here's the process that unfolds:

• Symbol Substitution: After your Go code contains a make() call, it's symbolized as OMAKE.
• Typechecking: The OMAKE symbol undergoes typechecking, resulting in OMAKECHAN for channels.
• Code Generation: The OMAKECHAN symbol is ultimately mapped to runtime·makechan or runtime·makechan64.

This intricate process unfolds across several compiler stages:

• Symbol Substitution and Typechecking: cmd/compile/internal/gc/typecheck.go
• Runtime Function Substitution: cmd/compile/internal/gc/walk.go

Tracking Down the Implementation

Locating these implementation details requires a logical approach. Since make() is a compiler-level feature, our focus should be on the compiler itself.

• Identify the Compiler Stage: Consider which stage of the compilation process would handle the specific feature (e.g., symbol substitution for make()).
• Explore the Compiler Stages: Search through the various compiler stages in the Go source tree (gc, g, l).
• Locate the Definitions: Examine the identified stages to find the definitions corresponding to the feature you're investigating.

Through this methodical approach, you can unveil the inner workings of many Go language features, including the elusive make() function.

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