HC08: Not allocated variables

[jdiogon]

Hi everybody !

I've some problems while debugging code with CodeWarrior :
some of my variables are indicated as "not allocated", and appear in grey.
Then my code doesn't work.

Is there anybody here who knows how to solve this ?

Thanks a lot in advance.

Message Edited by CrasyCat on 2007-04-13 11:05 AM

[jdiogon]

I'm working with a HCS08.

I'm gonna look if I can see registers in the debugger.

Thank you again for all your answers.

PS : Emmanuel : je pense que nous sommes tous deux français...
J'étudie à l'ISIMA à Clermont-Ferrand.
Et toi tu es d'où ? :smileywink:

Message Edited by jdiogon on 2007-01-1908:22 PM

[Nouchi · Accepted solution]

Hi,

Your variable appears in Grey because it's optimized, so if you don't want optimization only for this variable, you have to declare it as "volatile".


regards,
Emmanuel

[jdiogon]

Thanks.

Is there any solution to avoid this for all code ?
I'd like to be able to access all my variables in the debugger easily.

[Stephen]

(Without knowing which processor and debugger you are using) does your debugger show you the current contents of the registers and accumulators? Usually "optimisation" just means the C-level instruction is being carried out directly in registers and accumulators.

When I have been faced with debugging in similar circumstances on an HCS12 processor, I have usually found I can still work out what's happening from watching the registers and accumlator. An 8-bit variable is usually put in ACC.B, a 16 bit in ACC.D. A display of the compiled code in assembler also helps.

An early career writing everything in assembler is never completely wasted! :smileyhappy:

[CrasyCat]

Hello

  There is no way to disable all optimization in the compiler.

  The compiler will always optimize access to variables with local scope.

CrasyCat

[Lundin]

"There is no way to disable all optimization in the compiler."

Why not?

- Every other compiler in the known world has this feature, including crappy freeware compilers made by hobbyists.
- It can't be awfully hard to implement it.
- Debugging optimized code is incredible annoying.

[jdiogon]

Thank you all !