When is space allocated for local variables?

Question

Example

function Test: Boolean;
var
  a, b, c: Integer;
begin
  ...
end;

When a program containing such code is executed, are they allocated a, band ceach time it is called Test, or are they distributed only once somewhere at the initialization stage? I ask about this because such information is not available in the debugger.

Answer 1

Here is a more accurate version.

Local variables are allocated:

• Usually on the stack
• In the register, if the optimizer can use it: for example, a simple method with only a loop and var i: integerdeclared as a local variable will most likely allocate iCPUs as registers for better speed.

How is the stack distributed?

x86 x64 :

• ;
• (, a MOV EBP,ESP; SUB ESP,16);
• , (, string); (, integer) , ;
• try..finally, ;
• /method;
• finally /method: , ;
• (, MOV ESP,EBP);
• .

" " ( EBP): , .

result : CPU/FPU, , , .

x64 , , , , .

Mac OS .

/ , / inline : , .

. Delphi.

Answer 2

. , .