Message-ID: <37970E9A.F3A06961@ix.netcom.com>
From: Brian MacBride <macbride AT ix DOT netcom DOT com>
Organization: Signal Computing Service Ltd.
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Newsgroups: comp.lang.c,comp.os.msdos.djgpp
Subject: Re: HELP-General Protection Exception
References: <3794EC05 DOT 3461D8A2 AT earthlink DOT net> <3795E8BB DOT 657B78AA AT ix DOT netcom DOT com> <7n5k0p$h8q$1 AT fir DOT prod DOT itd DOT earthlink DOT net>
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Date: Thu, 22 Jul 1999 06:29:14 -0600
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To: djgpp AT delorie DOT com
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Rainbow Warrior wrote:
> 
> Brian MacBride wrote:
> 
> > Rainbow Warrior wrote:
> > >
> > > Hello,
> > >
> > >         This has been stumping me for days. The program compiles OK but
> > > during execution it gives me a general protection exception.  I cannot
> > > see why. This program simulates pass 2 of an assembler.  The function
> > > which trips it up is supposed to get tokens from a line of text read in
> > > from an input file.
> > >
> > > Any help would be greatly appreciated
> > >
> > > Juan Sanmiguel
> > >
> >
> > Consider...
> >
> > #define  HT_SIZE      109  /* number of entries in the hash table    */
> >
> > struct st_entry {
> >      char    st_name[NAME_LENGTH + 1];
> >      char    st_type;  /* R (Relocatable), A (Absolute),
> >                           E (Exported - external definition),
> >                           I (Imported - external reference),
> >                           C (Control section), N (Not applicable) */
> >      int     st_value;
> > };
> > struct  st_entry  symtbl[HT_SIZE];
> >
> > void init()
> > { ...
> >
> > /* You have...
> > for (counter=0; counter <= HT_SIZE; counter++)
> >                 strcpy(symtbl[counter].st_name," ");
> > */
> >
> > /* Consider... */
> >
> > for (counter=0; counter < HT_SIZE; counter++)
> >                 strcpy(symtbl[counter].st_name," ");
> >
> > ...
> > }
> >
> > With this change your program runs (correctly??) with no GPF.
> >
> > Regards
> >
> > Brian
> 
>         Did it. Still get a GPF. The fault is somewhere in the pass2 or get
> tokens procedure. At least, the program worked until I added those functions.
> As for running correctly, the program is in its early stages.  At this point
> it should load the operation and symbol tables and read the source code and
> seperate into individual tokens for processing.
>         What compilier did you use?  I have tried both Borland 4.52 and Djgpp.
> 
> Again any help would be greatly appreciated.
> 
> Juan Sanmiguel

Your program runs (correctly??) without a GPF when compiled with VC++.
The program compiled with Builder C++ creates a GPF...

void get_tokens (char *line_ptr, char *label_ptr, 
    char *oper_ptr, char *opnd_ptr, int *opi_ptr, int *len_ptr) {	

/* You had...
  char temp[4];
*/

/* Consider... */
  char temp[5];

...
}


No GPF with either VC++ or Builder C++.

HTH

Regards

Brian