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???
02/23/08 19:47
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 		 #151348 - Fair enough
Responding to: ???'s previous message
Michael Karas said:
I believe that the original idea was that "const" would be used to enforce access rules within the source file. It would make the compiler throw an error if code was encountered that tried to modify something declared with the const attribute. This had/has a lot more utility in OS environments where executables are loaded into a RAM environment such as the original platforms where C was developed and deployed.


So it does seem to me it's just a way to make the compiler make sure the developer doesn't do something stupid.

Having said that, on the 8052, I don't see much of a problem with "const" putting the constant information into code memory--unless it is specifically overrided by some other modifier that wants to put it elsewhere. Internal RAM is at a premium and storing constants there ought to be the rare exception, not the rule.

Regards,
Craig Steiner


List of 54 messages in thread
TopicAuthorDate
Best way to consolidate....out of memory            01/01/70 00:00      
   isn't this the classical gotcha?            01/01/70 00:00      
   There was a hint here....            01/01/70 00:00      
      Not const            01/01/70 00:00      
         Not necessarily            01/01/70 00:00      
            Hmmm...            01/01/70 00:00      
               Hmmm, indeed            01/01/70 00:00      
               Why?            01/01/70 00:00      
                  One reason ... and the prolly the original intent            01/01/70 00:00      
                     Obviously            01/01/70 00:00      
                        Speed            01/01/70 00:00      
                           Rogue programs?            01/01/70 00:00      
                              Yes. And stupid programmers            01/01/70 00:00      
                                 True            01/01/70 00:00      
                           cases            01/01/70 00:00      
                        The Obvious...            01/01/70 00:00      
                           Fair enough            01/01/70 00:00      
                              make sure the developer doesn't do something stupi            01/01/70 00:00      
                              Const to Code EPROM or FLASH,,,            01/01/70 00:00      
                           const and volatile - for optimization            01/01/70 00:00      
                  consts in other than CODE space            01/01/70 00:00      
                     Use the extended keywords            01/01/70 00:00      
                        'const' and 'volatile'            01/01/70 00:00      
   Unreadable code!            01/01/70 00:00      
      It really was all Keils fault....;)            01/01/70 00:00      
   You don't want to start from here!            01/01/70 00:00      
      Previously, on 8052.com...            01/01/70 00:00      
      Array of string            01/01/70 00:00      
         Yes, my mistake            01/01/70 00:00      
   string concatenate            01/01/70 00:00      
      Comments            01/01/70 00:00      
         Wow......LOL            01/01/70 00:00      
            Not a C vs ASM thing            01/01/70 00:00      
               From your perspective, it may make sense            01/01/70 00:00      
      I went this direction....code padding removal?            01/01/70 00:00      
         For but one byte added to the array...            01/01/70 00:00      
         With proper ordering in source file...            01/01/70 00:00      
         Putting it all together            01/01/70 00:00      
            Spectacular Russ.....            01/01/70 00:00      
   THINK            01/01/70 00:00      
      that is surely needed            01/01/70 00:00      
      A bit easier to read?            01/01/70 00:00      
         easy to read???            01/01/70 00:00      
      typedef vs #define            01/01/70 00:00      
      I think not            01/01/70 00:00      
         Tks Russ.            01/01/70 00:00      
            THINK(ing)            01/01/70 00:00      
               ???            01/01/70 00:00      
                  Objectives.            01/01/70 00:00      
                     I beg your pardon?!            01/01/70 00:00      
                     I see            01/01/70 00:00      
   Best way to consolidate....out of memory            01/01/70 00:00      
   Why specify CODE for functions?            01/01/70 00:00      
      there is so much stuff            01/01/70 00:00      

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