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| Title: | DEBUG |
| Notice: | Updated locations for reporting QARs -- see note 834.1 |
| Moderator: | LOWFAT::DIETER |
|
| Created: | Fri Jan 24 1986 |
| Last Modified: | Wed Jun 04 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 1868 |
| Total number of notes: | 8200 |
1832.0. "dbg> examine differs from DEC C assignment" by XDELTA::HOFFMAN (Steve, OpenVMS Engineering) Fri Jan 31 1997 15:11
/*
// The compiler and the debugger disagree on the contents of
// some variables... Quietly.
//
// The following -- see the comments just above the bottom of
// the module -- provide an example of this odd behaviour.
//
// DEC C V5.3-006 on OpenVMS Alpha V7.0. "Stock" debugger.
*/
#include <chfdef.h>
unsigned int main()
{
int RetStat, Trash, i;
char *Garbage;
struct chf$signal_array SignalArrayBuf, *SignalArrayPtr;
/*
// fill the signal array with some meaningless data,
// just so that we have something we can look at...
*/
Garbage = (void *) &SignalArrayBuf;
for ( i = 0; i < sizeof( struct chf$signal_array ); i++ )
Garbage[i] = i;
/* set up the pointer to the array */
SignalArrayPtr = (void *) &SignalArrayBuf;
Trash = SignalArrayPtr->chf$is_sig_name;
/*
// now perform the debug commands:
//
// dbg> examine/hex Trash
// dbg> examine/hex SignalArrayPtr->chf$is_sig_name
//
// the displayed values will be quite different...
//
// I *think* the difference is due to a pre-processor
// definition over in chfdef.h, but I'm not sure if
// this is a DEC C, debug, or OpenVMS (we own the
// header file in question) issue...
*/
return 1;
}
| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1832.1 | | SSPADE::ARSENAULT | | Mon Feb 03 1997 10:18 | 5 |
| I tried it out. It works ok for me.
I'm using DEC C T5.2-006 on OpenVMS Alpha V7.0 with the V7.0 debugger.
The difference is either the compiler or the include files.
|
| 1832.2 | | SSPADE::ARSENAULT | | Mon Feb 03 1997 10:27 | 7 |
| I tried it on SAREKS, using DEC C V5.5-002 on OpenVMS Alpha V7.0 and apparently
different include files.
It works find there too.
Mail me your image.
|
| 1832.3 | | SSPADE::ARSENAULT | | Mon Feb 03 1997 15:28 | 39 |
| You've run into the problem described in note 1799.
The field chf$is_sig_name is a member of a nested union
#ifdef __NEW_STARLET
typedef struct _chfdef1 {
__union {
int chf$is_sig_args; /*NUMBER OF SIGNAL ARGUMENTS */
int chf$l_sig_args; /*obsolete def */
} chf$r_sig_args_desc;
__union {
int chf$is_sig_name; /*SIGNAL NAME */
int chf$l_sig_name; /*obsolete def */
} chf$r_sig_name_desc;
__union {
int chf$is_sig_arg1; /*FIRST SIGNAL SPECIFIC ARGUMENT */
int chf$l_sig_arg1; /*obsolete def */
} chf$r_sig_arg1_desc;
} CHFDEF1;
#if !defined(__VAXC)
#define chf$is_sig_args chf$r_sig_args_desc.chf$is_sig_args
#define chf$l_sig_args chf$r_sig_args_desc.chf$l_sig_args
#define chf$is_sig_name chf$r_sig_name_desc.chf$is_sig_name
#define chf$l_sig_name chf$r_sig_name_desc.chf$l_sig_name
#define chf$is_sig_arg1 chf$r_sig_arg1_desc.chf$is_sig_arg1
#define chf$l_sig_arg1 chf$r_sig_arg1_desc.chf$l_sig_arg1
#endif /* #if !defined(__VAXC) */
It turns out that you're using the command
$ cc/decc/deb/noopt x
and I'm using the command
$ cc/decc/deb/noopt x /stand=vaxc
which, at least in this case, produces better DSTs.
|