[Flashforth-devel] stack size and behaviour question

[Peter J. <pe...@me...>]

Mikael,

    I was updating the Elements of FlashForth document (after a long 
pause) and was checking to see what would happen as I filled up the 
parameter stack to the maximum of 26 elements for FF5 on a PIC18.  I get 
to the 20th element and the behaviour surprises me. I had expected to be 
able to accumulate 26 elements because of the line

#define PARAMETER_STACK_SIZE d'52'      ; 26 cells parameter stack
in p18f-main.cfg.

0  ok<#,ram>0
1  ok<#,ram>0 1
2  ok<#,ram>0 1 2
3  ok<#,ram>0 1 2 3
4  ok<#,ram>0 1 2 3 4
5  ok<#,ram>0 1 2 3 4 5
6  ok<#,ram>0 1 2 3 4 5 6
7  ok<#,ram>0 1 2 3 4 5 6 7
8  ok<#,ram>0 1 2 3 4 5 6 7 8
9  ok<#,ram>0 1 2 3 4 5 6 7 8 9
10  ok<#,ram>0 1 2 3 4 5 6 7 8 9 10
11  ok<#,ram>0 1 2 3 4 5 6 7 8 9 10 11
12  ok<#,ram>0 1 2 3 4 5 6 7 8 9 10 11 12
13  ok<#,ram>0 1 2 3 4 5 6 7 8 9 10 11 12 13
14  ok<#,ram>0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
15  ok<#,ram>0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16  ok<#,ram>0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
17  ok<#,ram>0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
18  ok<#,ram>0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
19 123456781518 ?
19  ok<#,ram>19

Is this a bug?  Should there be a message to say that the stack has 
overflowed along with the "?" ?

Regards,

Peter Jacobs