Where to Find the Implementation of the 'make' Built-in Function
The 'make' built-in function in Go is a versatile tool for creating various data structures like slices, maps, and channels. However, unlike other built-in functions, finding its source code implementation can be challenging due to its absence from the 'golang.org/pkg/builtin' documentation.
Understanding the Internal Process
To locate the 'make' implementation, you need to delve into the Go compiler's internal processes, which involve several stages:
- Symbol Substitution: The compiler replaces 'make()' with 'OMake'.
- Symbol Typechecking: The type of 'OMake' is determined and annotated as 'OMakeChan'.
- Code Generation: 'OMakeChan' is translated into the corresponding runtime call, such as 'runtime·makechan'.
Tracing the Implementation
Knowing this process, you can trace the implementation through the Go compiler stages:
- Type Checking: Locate the conversion from 'OMake' to 'OMakeChan' in 'cmd/compile/internal/gc/typecheck.go'.
- Function Substitution: Find the substitution of 'OMakeChan' with 'runtime·makechan' in 'cmd/compile/internal/gc/walk.go'.
- Runtime Execution: Examine the 'runtime·makechan' function in 'pkg/runtime', which handles the actual creation of channels.
How to Find It Yourself
To improve your ability to locate source code implementations without external assistance, follow these tips:
- Analyze the Context: Consider the context in which the built-in function is used to determine its possible stages of execution.
- Explore the Compiler Stages: Search relevant files in the compiler's various stages ('gc', 'g', 'l') to find definitions and substitutions.
- Leverage the Go Documentation: Utilize the Go documentation (e.g., godoc.org) to explore the runtime package and find references to the built-in function's implementation.
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