Fix Memory Leak

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Summary:

I have been looking around, and can't seem to find a solution.

Fix Memory Leak

Zachatoo 02 Jun 2014 01:29

I have a problem in my code concerning memory leaks. The problem not only causes a leak, but makes my program exit a loop at an undesired time. Here is what I mean.

While 1
Lbl 1
subProgram
some code
Repeat conditions
If one condition:Goto 1
some code
End
some code
End

I'm wondering if there is something I can put in the subprogram that would prevent the leak? Or in the main program. I would prefer to not have to reorganize my entire code. Thanks in advance!

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Twitter: @zachatoo

Re: Fix Memory Leak

earthnite 02 Jun 2014 04:04

While 1
while 0
Lbl 1
End
subProgram
some code
Repeat conditions
If one condtion
Goto 1
some code
End
some code
End

This should stop the memory leak, its usually better to reorganize your code if you can. I'm not sure where or why its jumping out of a loop it might be the leak or the 'some code'

Re: Fix Memory Leak

Zachatoo 02 Jun 2014 05:13

I have tried that solution, but it doesn't work! It doesn't allow me to go to Lbl 1! Let me get more specific as to the code. This code does work, but it keeps track of an extra end if Ans=22, skipping a section of code when C=I and D=J.

Lbl 2
some code
While 1
Lbl 1
some code
Repeat C=I and D=J
getKey->K
If Ans=21
Goto 2
If Ans=22    //naughty piece of code
Goto 1
If Ans
some code
End
some code    //this is skipped if above Ans=22
End
Goto 2

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Twitter: @zachatoo

Re: Fix Memory Leak

earthnite 02 Jun 2014 06:30

I guess when the lbl is in a While 0 loop it never finds it. :p Sorry about that.

Try changing my 'While 0' to 'If 1:Then'

The idea behind this is that when it jumps out of a loop it jumps into a loop with an equal amount of ends so that there aren't any missing or extra ends.

Last edited on 02 Jun 2014 06:31 by earthnite Show more

Re: Fix Memory Leak

Xeda Elnara 04 Jun 2014 03:06

The problem is that you are jumping out of the Repeat loop before it hits its End. When a loop is entered, the parser pushes a certain amount of data onto a stack (including the location of the loop start). This only gets popped off when an End is reached (or the end of the program is reached). If you never hit that End, the data never gets popped off, and if you re-enter the Repeat loop as in your code, the parser makes another push, and so on.

What you want is something like:

While 1
  Lbl 1
    <<code>>
    Repeat [conditions]
      <<code>>
    End
    If condition_1:Goto 1
    <<code>>
End

Since that is just an example, I would leave it like that. However, in practice, I would actually do:

Repeat [condition_2+condition_3+...]
  subprogram
  <<code>>
  Repeat [condition_1+condition_2+condition_3+...]
    <<code>>
  End
End

Note that the first Repeat does not use condition_1. If condition_2 is met, then the code exits the inner Repeat loop, then the outer one is exited. If condition 1 is met, it exits the inner loop, but not the outer loop, and also executes the subprogram and code.

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Z80 Assembly>English>TI-BASIC>Python>French>C>0

Last edited on 04 Jun 2014 03:06 by Xeda Elnara Show more

Re: Fix Memory Leak

Zachatoo 04 Jun 2014 17:29

I managed to fix it, thanks a lot for your help! :)

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Twitter: @zachatoo

Re: Fix Memory Leak

Xeda Elnara 05 Jun 2014 01:35

It's no problem!

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Z80 Assembly>English>TI-BASIC>Python>French>C>0