Re: Debugging Emacs with gdba

[Nick Roberts]

 > > When the cursor is over a value in the speedbar, the tooltip now displays
 > > the data type.  Unfortunately for lisp objects it displays "int".  It
 > > would be nice if it displayed Lisp_Object.  I don't know how to get it to
 > > do this, though.
 > 
 > Does your debug info format support macro expansion?  If it does, you
 > could try using the `macro *' commands in GDB to display Lisp_Object.

In fact by using a macro for Lisp_Object, the information is lost.  If I
make the change below, it works.  I think this change is right, in any
case.  If Lisp_Object is a union, its done this way.  And it's generally
useful.  Debugging with GDB from the command line, if you are unsure what
a variable is representing, you can type:

(gdb) whatis new
type = Lisp_Object

instead of getting

(gdb) whatis new
type = int

Is it OK to install this patch?

Nick


*** lisp.h      16 Nov 2005 08:02:46 +1300      1.545
--- lisp.h      19 Nov 2005 11:28:51 +1300      
***************
*** 253,259 ****
  /* If union type is not wanted, define Lisp_Object as just a number.  */
  
  #ifdef NO_UNION_TYPE
! #define Lisp_Object EMACS_INT
  #define LISP_MAKE_RVALUE(o) (0+(o))
  #endif /* NO_UNION_TYPE */
  
--- 253,259 ----
  /* If union type is not wanted, define Lisp_Object as just a number.  */
  
  #ifdef NO_UNION_TYPE
! typedef EMACS_INT Lisp_Object;
  #define LISP_MAKE_RVALUE(o) (0+(o))
  #endif /* NO_UNION_TYPE */