Who determines whether a specific object can be placed in memory?

In Go (Golang), object placement in memory is determined by the compiler and runtime.

• The compiler decides where to place a variable: on the stack or on the heap, based on its scope and lifetime analysis (escape analysis).
• If a variable "escapes" from a function (for example, is returned or used after the function exits), it is placed on the heap.
• Otherwise, it is placed on the stack, which is faster.

Thus, the decision to place an object in memory is made by the compiler at compile time, while the runtime manages allocation and garbage collection for heap objects.