* OCamldebug breakpoint issues
@ 2005-07-12 14:22 Nathaniel J. Gaylinn
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From: Nathaniel J. Gaylinn @ 2005-07-12 14:22 UTC (permalink / raw)
To: caml-list
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I'm having trouble dealing with breakpoints in OCamldebug. The
documentation seems to make it clear that you can set a breakpoint at any
event in your program, but ONLY at an event. This makes sense to me.
The problem is, in practice, I can't seem to set a breakpoint at an
arbitrary event.
For starters, I used "info events Bignum" to get a list of events for
my module (its name is Bignum). Fine. I get a long list of event points.
Then I started trying to set breakpoints at each event one after the
other. That's when I began to see odd behavior.
I can set breakpoints at some events with no difficulty. For
instance, "break @ Bignum #31" sets a breakpoint at offset 31 just as it
should. With other events, instead of setting a breakpoint where I
requested, the breakpoint is put at some earlier event. For instance,
"break @ Bignum #50" sets a breakpoint at offset 31. This is odd, since as
far as I know I should be able to set a breakpoint at any event. Usually
this earlier event is the one right before the event I requested, but
sometimes its as many as three events back.
What's truly baffling to me, though, is this: if I try to set an event at
offset 185 (break @ Bignum #185) a breakpoint is created at offset 168,
the event before the one I requested. However, when I try to set a
breakpoint at offset 208, I get a breakpoint set at offset 185!!!
Either something's very wrong here, or I have a fundamental
misunderstanding about how the debugger works with breakpoints. Any tips
or suggestions would be greatly appreciated. For reference, the file I
refer to in this email is attached for reference.
Thank you,
-- Nate
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let rec longAddWithoutCarry =
function
[], x -> x
| x, [] -> x
| hd1 :: tl1, hd2 :: tl2 -> hd1 + hd2 :: longAddWithoutCarry (tl1, tl2)
let longAdd (lst1, lst2) =
let rec helper = function
[], [], 0 -> []
| [], [], carry -> [carry]
| [], hd :: tl, carry -> (hd + carry) mod 10 :: helper ([], tl, (hd + carry) / 10)
| hd :: tl, [], carry -> (hd + carry) mod 10 :: helper (tl, [], (hd + carry) / 10)
| hd1 :: tl1, hd2 :: tl2, carry -> (hd1 + hd2 + carry) mod 10 :: helper (tl1, tl2, (hd1 + hd2 + carry) / 10)
in
helper (lst1, lst2, 0)
let multAll prod lst = List.map (fun x -> x * prod) lst
let timesTen lst = 0 :: lst
let rec longMult = function
[], num2 -> []
| hd :: tl, num2 -> longAdd (multAll hd num2, timesTen (longMult (tl, num2)));;
longMult ([3; 2; 1], [2; 1]);;
longMult ([2; 1], [3; 2; 1]);;
longMult ([9; 7; 6; 5; 4; 3; 2; 1], [8; 1]);;
longMult ([], [9; 9; 9; 9; 9; 9]);;
longMult ([1], [9; 9; 9; 9; 9; 9]);;
longMult ([1; 1; 1; 1; 1; 1; 1; 1; 1], [1; 1; 1; 1; 1; 1; 1; 1; 1]);;
let rec forever a = forever a;;
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