Re: [Gretl-devel] global series penetrating into functions problem

On Tue, 16 Oct 2018, oleg_komashko(a)ukr.net wrote: Actually it did support penetration, you just had to pass the bundled list on to another function. Here's an example: <hansl> function void F2 (list L) print "Trouble in store!" end function function void F1 (bundle *b) matrix x = I(3) F2(b.xlist) end function nulldata 20 y = normal() x = normal() ols y 0 x mod = $model F1(&mod) # OK, or so it seems F1(&mod) # broken on second call </hansl> (Note: this won't run on current git without reverting the new guard against ID theft.) Here's what's happening. When you pass a list to a function, the member series have their "stack level" temporarily incremented so they're accessible within the function. Then on exit from the function the stack level is decremented so the series "go back to where they really belong." Suppose function F1 "steals" a reference to some series at main level rather than coming by it honestly via an argument. F1 passes a stolen list on to F2: the stack level of the members becomes 2. Then we return to F1, and their stack level goes to 1. But it never goes back to 0, as it should, because of course there's no record of F1 having obtained a reference to the series from main. In the case of a bundled list, it seems we'll have to treat that in the same way as a plain list argument, which we have not been doing so far: we need to create a record of origin of the member series. Allin