OpenEuphoria

Re: Pass by Reference

• Posted by petelomax Jan 15, 2015
• 2036 views

sequence result = get_operand() 
switch result[1] do 
   case P_REG then 
       { op, size, flags } = result 
   case P_VAR then 
       { op, size, n, type } = result 
   case P_MEM then 
       { op, size, scale, index, base, offset } = result 
   case P_LBL then 
       { op, lblidx } = result 
   case P_IMM then 
       { op, atom } = result 
end case 

Yes, but you can also, and indeed in places the current code actually does, do something like this

{ op, size, reg } = get_operand(P_REG) 

or this

{ op, size, scale, index, base, offset } = get_operand(P_MEM) 

In Phix, you get a fatal error if there aren't enough values, whereas OpenEuphoria just quietly leaves some values as-is, and on both, no messages if there are too many.

If anything, slightly tongue in cheek, it would be nice for

{ P_REG, size, reg, $ } = get_operand(P_REG) 
{ P_MEM, size, scale, index, base, offset, $ } = get_operand(P_MEM) 

to check, because P_REG/P_MEM are constants, that res[1] is the expected value and deliver a fatal runtime crash if not, and (from the ",$") check that the exact number of values was returned.

Pete