badri@ur-valhalla.UUCP (Badri Lokanathan) (10/24/86)
The problem is with dbx, BSD4.2 on a VAX 11/750.
I have the following defines, amongst many others, in a .h file:
--------------------------------------------------------------------------------
typedef struct fe_list {
int edge; /* Edge number. */
char dir; /* Direction of this edge. */
struct fe_list *next; /* pointer to the next record. */
} FE_LIST;
typedef struct bb_node {
int num; /* Number of this BB node. */
int parent; /* Number of the parent node. */
int l_bound; /* Lower bound for areas in this node */
int l_hdim,l_vdim; /* Lower bounds on the dimensions */
FE_LIST *fixed; /* Pointer to a list of the additions */
/* to the list of fixed edges. */
FE_LIST *fresh; /* Pointer to a list of edges that will */
/* be fixed in the leftmost son of this */
/* BB node. */
FE_LIST *seed; /* List of edges that are fixed but may */
/* not be included in any cutting path. */
} BB_NODE;
--------------------------------------------------------------------------------
In my program, I have the following statements:
BB_NODE *bb_aux;
bb_aux = (BB_NODE *) malloc((unsigned) sizeof (BB_NODE));
In dbx, if I go
print bb_aux I get
(size 0) bb_aux
Then (obviously, I suppose!) if I go
print *bb_aux I get
!! size(bad use) ??!! size(bad use) ??[bad use]
If I go
print BB_NODE * (bb_aux)
I get the message
dbx: internal error: reference through nil pointer at line 113 in file
languages.c
and then dbx exits.
Note that if I run a test segment with just the above definitions and
nothing else with a simple main segment, I can dbx it without any problems.
This leads me to believe that I am exceeding some internal table limit
and dbx does not warn me about it. Does anybody recognize this problem
and have a fix or suggestions? ("Use sdb" is not acceptable since I have
tried it and run into other problems.)
I have also had mysterious messages during a variable trace of the kind
dbx: internal error: missing triad 3
Any fixes or suggestions for this?
Badri Lokanathan
--
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