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gdba probs

From: Nick Roberts
Subject: gdba probs
Date: Thu, 5 Dec 2002 20:40:36 +0000

Miles Bader writes:

> Seeing the recent activity on `gdba', I decided to check it out, and got
> bunches of errors.  The gdb command line I used was this:

> It initially divided the frame into 6 (!) windows, most of which I
> don't want; 

The totalview debugger starts with 6 windows. But, hey!, lets be open minded
about this. How do you know you don't want them before you know what they do ?

> is there a way to customize which windows it uses?

(setq gdb-many-windows nil) gives you the just the two windows that I think
you're looking for. C-h f `gdba' explains a bit more.

Regarding the bunches of errors, they occur because you're using commands that
stop/step at the instruction level (break *_start, stepi, etc). Handling these
commands is on my TODO list. ;-)

For the moment if you want explore what this mode does you have to stick to
the statement level (break main, step, etc). I append below a nonsense program
that I have used to develop gdb-ui.el. Clearly this isn't useful test the lisp
code but it might help to show what it can do.

> BTW, note all the spurious `Mark set' and `Replaced 0 occurrences'
> messages (I never set the mark or did any replacing) -- it looks like
> some lisp code is using the `replace-string' function when it shouldn't
> (generally lisp code shouldn't use it at all).

I'm using replace-regexp which I know I shouldn't. The elisp manual does say
this but doesn't offer an alternative. I have noticed in vc.el from emacs-20.7 :

;; (replace-regexp (concat ":" (regexp-quote file) "$") (concat ":" newname))
(while (re-search-forward (concat ":" (regexp-quote file) "$") nil t)
   (replace-match (concat ":" newname) nil nil))

Is this construction a standard replacement for replace-regexp in lisp programs 
(if so I think it would be a good idea to say so in the manual)




/* cc -g -o temp temp.c myprint.o */
typedef struct {
  int r;
  float s;
} substruct;

typedef struct {
  int* r;
  float* s;
} subref;

main(int argc, char **argv) {
  int a[10]={0,1,4,9,16,25,36,49,64,81};
  int i,j,n,bigarray[20][20];
  int* k;
  char* b="fred";
  int c[4][3][2];
  substruct fred;
  substruct* bert;
  struct {
    int p;
    substruct q1;
    substruct q2;
  } t, *u;
  struct {
    int* p;
    subref* q;
  } w, *x;
  int l,m;
  for (i=0;i<20;i++) {
    for (j=0;j<20;j++) bigarray[i][j] = 20*i + j;
  fred.r = 1;
  fred.s = 5.5;
  bert = (void*)malloc(8);
  w.p = (void*)malloc(4);
  w.q = (void*)malloc(4);
  bert->r = 7;
  bert->s = 8.5;
  *w.p = 8;
  t.p = 7;
  t.q1.r = 2;
  t.q1.s = 2.5;
  t.q2.r = 3;
  t.q2.s = 3.5;
  /*  *x->q->r = 1;
   *x->q->s = 1.5; */
  k = (void*)malloc(4*sizeof(int));
  printf("Enter number of iterations : ");
  printf("Enter number of iterations again : ");
  printf("And again : ");
  for (i=0;i<n;i++) {
    m = 4;
    a[i] = 2*i;


myprint(int i,int j) {
  printf("a[%d] = %d\n",i,j);

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