🚀 go-pugleaf

In article <3949@ihlpf.ATT.COM>, nevin1@ihlpf (00704a-Liber) writes:
> If some vars are declared 'globally' (at the topmost level), it is very
> inefficient to access those variables in a procedure declared more than 1
> or 2 levels deep.  There is a way to implement scoping that alleviates this
> inefficiency, however.

Can you say "display"?  I knew you could.
You don't even need a full display.  Just retain a pointer to each level of
the display you actually need.  E.g.
	
program main(..); var x;
    procedure one(...); var y;
	procedure two(...); var z;
	    procedure three(...);
		begin {use x and y but not z}
		end;

-->
	    procedure three(...);
		var one_ptr: ^frame of one;
		begin
		    one_ptr := self^.parent^.parent;
		    {use global^.x and one_ptr^.y}
		end;

Any Pascal compiler which searches the static chain on every non-local
variable reference is a toy.