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Vastus AI-lt

In the Go compiler, memory on the heap is automatically allocated in the following situations:

  • When a variable needs to live longer than the execution time of the function in which it is declared (escape analysis). For example, if the address of a local variable is returned from a function or stored in a structure that lives longer.
  • If the variable is too large for the stack or its size is unknown at compile time.

Example:

func create() *int {
    x := 10
    return &x // the variable x "escapes" to the heap, as a pointer is returned
}

Here, the variable x will be placed on the heap so that the pointer remains valid after the function exits. The compiler analyzes the code (escape analysis) and decides where to allocate memory.