At what stages of the lifecycle is variable storage scope defined in the Go language?

In the Go language, the variable storage scope is determined at several stages of the program's lifecycle:

1. Compilation

   • The compiler analyzes the code and determines where and how variables will be stored: in the stack, heap, or static memory.
   • Local variables are usually placed on the function's stack.
   • If a variable is captured by a closure or its address is passed outside the function, the compiler may "lift" it to the heap (escape analysis).

2. Runtime

   • When a function is called, a stack is allocated for local variables.
   • Memory for variables stored on the heap is allocated dynamically.

3. Initialization

   • Variables are initialized with default values or specified values.

Thus, the variable storage scope is determined at compile time (through code analysis and escape analysis) and implemented at runtime through memory allocation on the stack or heap.