How Does Go Implement Closures in Memory?

Memory Layout of Go Closures

Go closures, like closures in many other programming languages, enable functions to access variables defined outside their scope. While the concept of closures is similar across languages, the way they are represented in memory can vary. In Go, closures are simple heap allocations.

The function m := M.Adder() creates both a function closure and an allocation for the M value. The memory allocated for this closure contains pointers to both the function and the M value. The function is allocated on the stack while the M value is allocated on the heap. The total memory allocated is 16 bytes (for the pointer to the function and the M value) plus the size of the M value (in this case, 8 bytes).

The returned func() value from the closure call does not allocate any additional memory. It simply references the existing closure allocation, which contains pointers to the function and the M value.

Therefore, the total memory allocated when calling a := m.Adder() is 24 bytes (16 bytes for the closure and 8 bytes for the M value). The function value itself does not allocate any additional memory and simply references the closure.

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