The debugger only instruments interpreted code, so evaluations
occurring inside library code do not show up in :trace. This is not a
terrible problem in practice, since usually seeing the evaluations
occurring in your code is what you need to debug the problem.
But since :trace is not showing you
How do I tell? Does this mean that if the exception is occurring in a
haskell library I can't get to it? I am trying to run down a
Prelude.read: No Parse error and I need to see the value that it is
failing to parse on.
Thanks.
Steve
On Tue, Aug 31, 2010 at 11:05 AM, Pepe Iborra wrote:
> Hi Ste
Hi Steve
The debugger only traces calls in interpreted code. Perhaps the call
to myMethod is being made from object code?
Admittedly, the ghci debugger can take some effort to learn to use
properly. Make sure that you give a look to the ghc user guide if you
haven't done so yet.
Best,
pepe
On
I am trying to debug a problem in GHCI. I invoke my method with trace
but when it breaks on exception i can't get this history. Output is
below. Thanks.
relude Symbols> :set -fbreak-on-exception
Prelude Symbols> :trace myMethod
Loading package HUnit-1.2.2.1 ... linking ... done.
Loading package s
> Hi,
> I'm a new Haskell programmer and am trying to output the values of some of
> the variables (for debugging) as the program executes.
Debugging? Use the GHCi debugger.
Cheers,
Thomas
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On Fri, Mar 19, 2010 at 04:03:52PM -0400, Ben Derrett wrote:
>
> trace2 a = trace (show a) a
>
> In the definition of `trace2': trace2 a = (show a) a
These don't match. It looks like maybe you forgot the call to trace
in your definition of trace2?
-Brent
___
Hi,
I'm a new Haskell programmer and am trying to output the values of some of
the variables (for debugging) as the program executes.
At the moment to output the value of the function I use:
f x y z = trace (show moves) moves
where moves = [complicated expression of x y z]
But really what I wa
Am Donnerstag 24 Dezember 2009 22:21:50 schrieb michael rice:
> Hmm... here are the functions I was looking to trace, the second one being
> an example from Scheme text "Concrete Abstractions" that I rewrote after
> seeing the first. Compared to the CL/Scheme memoization code, the Haskell
> seems l
1
walk_count n = memo_walk_count (n-2) + memo_walk_count (n-1)
in (map walk_count [0..] !!)
--- On Thu, 12/24/09, Daniel Fischer wrote:
From: Daniel Fischer
Subject: Re: [Haskell-cafe] trace
To: haskell-cafe@haskell.org
Cc: "michael rice"
Date: Thursday, December 24, 20
Am Donnerstag 24 Dezember 2009 21:31:34 schrieb michael rice:
> Can someone provide a simple example of tracing a function.
>
> Michael
Is
import Debug.Trace
infixl 0 `debug`
debug = flip trace
dfib :: Int -> Integer
dfib =
let fib 0 = 0
fib 1 = 1
fib n = dfib (n-2) + dfib
Can someone provide a simple example of tracing a function.
Michael
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Alexander Vodomerov <[EMAIL PROTECTED]> wrote:
> main = do
> putStrLn "xxx"
> return (trace "yyy" ())
> putStrLn "zzz"
>
> only xxx and zzz is displayed. yyy is missing.
This is because you never demanded the value of (trace "yyy" ()), so it
was never computed. The joys of laziness! To f
Hi,
Either one of these will work:
main = do
putStrLn "xxx"
x <- return (trace "yyy" ())
x `seq` putStrLn "zzz"
main = do
putStrLn "xxx"
trace "yyy" (return ())
putStrLn "zzz"
This works fine, the problem is that trace is defined to output the
first parameter before returning the second. In t
Alexander Vodomerov wrote:
> import Debug.Trace
>
> main = do
> putStrLn "xxx"
> return (trace "yyy" ())
> putStrLn "zzz"
>
> only xxx and zzz is displayed. yyy is missing.
> Why trace is not working?
Nothing uses the value of (trace "yyy" ()), so it is never
evaluated.
Try this instead, wh
Hello!
The function trace is supposed to write debug messages to console.
However, when I trying to run the following program
import Debug.Trace
main = do
putStrLn "xxx"
return (trace "yyy" ())
putStrLn "zzz"
only xxx and zzz is displayed. yyy is missing.
Why trace is not working?
PS.
Hi Lemmih,
Have you tried profiling the code?
You can find a guide to profiling with GHC here:
http://www.haskell.org/ghc/docs/latest/html/users_guide/profiling.html
I did that ... it shows that updateState is retaining most data (-hr
switch), as well as updateMap, which is increasing it's
On 7/6/06, Andy Georges <[EMAIL PROTECTED]> wrote:
Hello,
I'm looking for a bit of help (ok, a lot) the speed up my program
which I use to build a calltree out of an annotated program execution
trace. To give you an idea about the sluggishness at the moment, for
a trace containing 70MB, it has b
Hello,
I'm looking for a bit of help (ok, a lot) the speed up my program
which I use to build a calltree out of an annotated program execution
trace. To give you an idea about the sluggishness at the moment, for
a trace containing 70MB, it has been running for about 10 hours
straight (AMD
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